Environmental Characterization Summary and Remediation Scoping Avalon Substation Property th Avenue Southwest Seattle, Washington

Transcription

1 MEMORANDUM DATE: July 17, 2015 TO: FROM: RE: CC: Shannon Straws, Seattle City Light Nick Galvin and Ross Stainsby Environmental Characterization Summary and Remediation Scoping Avalon Substation Property th Avenue Southwest Seattle, Washington Tom Meyer, Seattle City Light This memorandum provides the findings of previous investigations conducted by Seattle City Light (City Light), a summary of Hart Crowser s recent soil sample investigation, and our recommendations for remediation at the City Light Avalon substation property (Site). The Site is at th Avenue SW in Seattle, Washington (Figure 1). Purpose We understand that City Light is evaluating known and unknown historical contamination on this property and would like to remove contaminated soil from the Site. A mercury cleanup was previously undertaken by City Light within the building and the drainage system leading into the former transformer yard. The objective of the recommended remedial action is to remove contaminated soil and verify that the remaining soil does not exceed Model Toxics Control Act (MTCA) Method A unrestricted or MTCA Method B direct contact cleanup levels. The MTCA Method B cleanup levels referenced in this memorandum were obtained from the Washington State Department of Ecology Cleanup Level and Risk Calculation (CLARC) database. This memorandum is intended to provide general guidance for planning purposes; it is not intended to prescribe contractor means and methods. We understand that City Light plans to contract directly with a contractor to complete the remedial activities recommended in this memorandum. It is the contractor s responsibility to comply with all local, state, and federal regulations during performance of all work Westlake Avenue North, Suite 200 Seattle, Washington Fax Tel

2 Seattle City Light July 17, 2015 Page 2 Site Description The Site is in a mixed commercial and residential area bordered by residential houses to the north and east, and an alley and gas station to the south. 35th Avenue SW is to the west, and SW Genesee Street is to north. The southern portion of the Site consists of a gravel yard with concrete transformer pads used by the former substation. The gravel yard and concrete pads are surrounded by a chain link fence. An abandoned structure that formerly housed rectifiers for the Seattle trolley system sits in the center of the Site. The areas surrounding the building to the north and west are grassy and/or landscaped. A gravel driveway from SW Genesee Street is directly east of the building. City Light is using the gravel yard and portions of the building for storage. To the west, along 35th Avenue SW, there is an abandoned retail building and paved parking lot. Landscaped areas surround the south and southeast sides of the building. A site plan showing Site features is presented on Figure 2. Previous Investigations Summary Avalon Unit Substation Mercury Remediation In 2009, City Light conducted an investigation and limited cleanup of mercury at the Site. The results are presented in Attachment A and summarized below. The source of mercury is believed to be the mercury filled rectifiers formerly housed at the Site and removed in the 1960s. A Lumex RA 915 atomic absorption spectrometer was used by City Light to measure ambient and point source areas of mercury. An electrical conduit trench was found to have the highest concentrations of mercury vapors, which ranged from 500 to 17,000 nanograms per cubic meter (ng/m 3 ); the Environmental Protection Agency (EPA) industrial re occupancy level is 1,300 ng/m 3. In 2010, a contractor for City Light treated the trench with repeated surficial applications of HgX, which bonds to mercury and then is removed with a mercury vacuum. A drain pipe within the trench contained the highest concentration of mercury. The drain was intercepted in the yard and plugged from both ends with concrete for future pipe removal. The trench was coated with a white epoxy to encapsulate residual mercury and distinguish it from the surrounding areas. No other areas of mercury contamination were found in this investigation. Hart Crowser Investigation Summary On behalf of City Light, Hart Crowser completed a near surface investigation to further characterize the Site for potential contamination associated with known former site operations. In March 2015, four composite concrete samples (AV CONC 1 through 4) and 14 composite soil samples (AV COMP1

3 Seattle City Light July 17, 2015 Page 3 through COMP14) were collected. On April 24, 2015, one additional composite soil sample (AV COMP15) was collected. The composite concrete samples comprised four or five subsamples collected by chiseling concrete from the surface of the pad. The composite soil samples comprised three to five subsamples collected from below surficial soil and vegetation between 0 and 6 inches below ground surface (bgs). The composite soil and concrete sample locations and constituents of concern concentrations are shown on Figure 2. The composite samples were analyzed for one or more of the following: Diesel and lube oil range petroleum hydrocarbons by NWTPH Dx; Polychlorinated biphenyls (PCBs) by EPA Method 8082A; Organochlorine pesticides by EPA Method 8081B; Chlorinated acid herbicides by EPA Method 8151A; and MTCA 5 metals (arsenic, cadmium, chromium, lead, and mercury) by EPA Methods 6010C and 7471B. A data quality review and laboratory reports are in Attachment B. Composite Concrete Sample Analytical Results Concrete composite sample locations and constituents of concern results are shown on Figure 2 and analytical results are presented on Table 1. Cadmium was above MTCA cleanup levels in the concrete samples AV CONC 1 and CONC 2 at 4.5 and 2.7 milligrams per kilogram (mg/kg), respectively. These samples were taken from locations in the southern portion of the concrete pad inside the former transformer yard. Lube oil was measured at the 2,000 mg/kg MTCA cleanup level in AV CONC 2. PCB results were all below the practical quantification limit (PQL). Composite Soil Sample Analytical Results Composite soil sample locations and constituents of concern results are shown on Figure 2 and analytical results are presented on Table 2. Dieldrin was above MTCA cleanup levels in five composite samples (AV COMP8, COMP9, COMP10, COMP11, and COMP 15) at concentrations ranging from 140 to 2,900 µg/kg. These composite samples were taken from locations in the grassy/landscaped areas adjacent to the remaining structure. PCBs and herbicide concentrations were either below laboratory PQLs or below MTCA unrestricted soil cleanup levels. Lead was above the MTCA Method A unrestricted cleanup level in three composite samples (AV COMP2, COMP3, and COMP5) at concentrations ranging from 270 to 510 mg/kg and at the 250 mg/kg cleanup

4 Seattle City Light July 17, 2015 Page 4 level in composite sample AV COMP7. Composite samples COMP2, COMP3, and COMP5 were taken from locations in the former transformer yard, inside the fence. AV COMP7 was taken from locations adjacent to the driveway along the east property boundary. The soil sample with the highest lead concentration (AV COMP5) was also reanalyzed for lead after being extracted through the toxicity characteristic leaching procedure (TCLP). The TCLP lead result was 0.22 mg/l, which is below the characteristic hazardous waste level of 5 mg/l. Mercury was measured in composite sample AV COMP8 at 6.6 mg/kg, above the MTCA Method A cleanup level of 2 mg/kg. AV COMP8 was taken from locations adjacent to the driveway along the east side of the existing structure. Soil sample AV COMP8 was also reanalyzed for mercury after being extracted through the TCLP. The TCLP mercury result was below the PQL. Arsenic was at the 20 mg/kg MTCA cleanup level in AV COMP13. Chromium was detected in composite sample locations across the Site at concentrations between 18 and 100 mg/kg. The MTCA Method A cleanup levels for chromium III and chromium VI are 2,000 and 19 mg/kg, respectively. We assume the chromium indicates the presence of chromium III, since there are no known historical uses (such as chrome plating) of chromium VI at the Site. Composite Soil Subsample Analytical Results The composite soil subsample locations and constituents of concern results are shown on Figure 3 and analytical results are presented on Table 3. Because of the lead analytical results for samples AV COMP2, COMP3, COMP5, COMP7, and COMP11 (slightly below MTCA cleanup level), the subsamples that made up these composite samples were also analyzed for lead. Lead was above the MTCA Method A unrestricted cleanup level of 250 mg/kg in AV COMP2 SS4 (1,100 mg/kg); AV COMP3 SS1 (650 mg/kg); AV COMP5 SS1, SS2, and SS4 (670 mg/kg, 1,000 mg/kg, and 280 mg/kg, respectively); AV COMP7 SS1 and SS3 (450 mg/kg and 410 mg/kg, respectively); and AV COMP11 SS1 and SS5 (510 mg/kg and 260 mg/kg, respectively). Lead was measured below or at cleanup levels in the remaining subsamples. The soil samples AV COMP2 SS4 and AV COMP5 SS2 were also reanalyzed for lead after being extracted through the TCLP. The TCLP lead results for AV COMP2 SS4 and AV COMP5 SS2 were 0.21 and 0.52 mg/l, respectively. The subsamples that made up AV COMP2 were analyzed for cadmium. Cadmium was above the MTCA Method A cleanup level of 2.0 mg/kg in AV COMP2 SS4 (5.2 mg/kg). Cadmium was either not detected or was below cleanup levels in the remaining AV COMP2 subsamples.

5 Seattle City Light July 17, 2015 Page 5 The subsamples that made up composite samples AV COMP7 and AV COMP8 were analyzed for mercury. Mercury was above the MTCA Method A cleanup level of 2.0 mg/kg in AV COMP8 SS1 (30 mg/kg). Mercury was not detected in subsample AV COMP8 SS2 or SS3. Mercury was either not detected or was below cleanup levels in all AV COMP7 subsamples. The subsamples that made up composite sample AV COMP13 were analyzed for arsenic. Arsenic was above the MTCA Method A cleanup level of 20 mg/kg in AV COMP13 SS3 (49 mg/kg). Arsenic was below the MTCA Method A cleanup level in AV COMP13 SS1 and SS2 (17 mg/kg and 19 mg/kg, respectively). The analytical results indicate dieldrin was distributed evenly across the northwestern portion of the Site, therefore no subsamples were analyzed for pesticides. The composite subsample locations and constituents of concern are shown on Figure 3. The pesticides aldrin, endrin ketone, and 4,4 DDT (and its residues 4,4 DDD and 4,4 DDE), as well as the herbicides 2,4 D and pentachlorophenol (PCP), were detected in samples from one or more locations at concentrations below their respective MTCA cleanup levels. Hand Auger Sampling Hand auger sample locations and constituents of concern results are shown on Figure 3 and analytical results are presented on Table 4. To delineate the vertical extent of contamination at selected locations, eight hand auger samples were collected from four locations (AV CORE 1 through 4) in April At each location, one sample was collected from approximately 8 to 10 inches bgs and another from 18 to 20 inches bgs. The samples from AV CORE 1 were analyzed for mercury and lead. The samples from AV CORE 2 were analyzed for cadmium and lead. The samples from AV CORE 3 were analyzed for cadmium, lead, and PCBs. The samples from AV CORE 4 were analyzed for lead and dieldrin. Lead, cadmium, and mercury were either not detected above the PQL or were below cleanup levels in all hand auger samples. Dieldrin was not detected above the PQL in either sample from AV CORE 4. PCBs were not detected above PQLs in either sample from AV CORE 3. Remediation Work Elements As stated above, the objective of the proposed remedial action is to remove contaminated soil and verify that the remaining soil does not exceed MTCA Method A or MTCA Method B unrestricted direct contact cleanup levels. City Light is planning to remove the existing structure located in the center of the property. This work will be performed separately and is planned to pre date the excavation of contaminated soils.

6 Seattle City Light July 17, 2015 Page 6 Remediation activities to be completed by the contractor should generally consist of the following tasks (additional detail on selected tasks is provided later in this memorandum): Prepare a site specific health and safety plan. Locate public and private utilities. Prepare a temporary erosion and sediment control (TESC) plan. Obtain applicable permits, which may include (but are not limited to) fill and grading permits. City Light will coordinate street use permits. The contractor will be responsible for submitting a traffic control plan as necessary. Install temporary security fencing around the perimeter of the Site. Excavate the indicated areas of the property to a depth of approximately 10 inches. The actual depth of excavation will be determined by verification samples in each area. Proposed excavation depths are shown on Figure 2. The transformer yard fence, concrete retaining wall, and the concrete stairs will be removed during remediation work. The elevation change between upper and lower yards will need to be graded to meet Seattle Code and relevant permits. Excavation work within the drip line of trees marked for preservation will need to be completed during the rainy season and will need to adhere to procedures specified by City Light. Backfill and compact excavated areas after analytical results are received, and place organic topsoil for later reseeding, as specified by City Light, over the structural fill material. Prepare and implement all necessary documentation and labeling for proper shipment of contaminated soils and concrete. Haul soil and concrete and dispose of it at a properly permitted and authorized solid waste landfill. The contractor will coordinate with all disposal facilities. A Hart Crowser environmental representative will be present during construction activities and will be responsible for the following work elements: Collect and analyze soil samples for disposal characterization, if necessary. Observe and document field activities, including erosion control measures. Monitor on site remedial actions for compliance with applicable environmental codes and regulations. Collect confirmation samples from the excavated areas and, in coordination with City Light, identify required additional cleanup activities accordingly. Earthwork The contractor is responsible for protecting utilities, fences, pavement, structures on or adjacent to the property, and vegetation located outside the property boundary from all activities associated with remedial actions. Excavation areas and volumes provided in this report are based on available

7 Seattle City Light July 17, 2015 Page 7 information. Actual areas and volumes excavated may change, depending on field observations or the results of confirmation sampling. Excavation Arsenic, cadmium, lead, mercury, and pesticide concentrations in near surface soil exceed MTCA cleanup levels in several locations, as shown on Figure 2. We recommend removing the impacted soil to a depth of approximately 10 inches across the Site (Figure 2). Additional excavation to 16 inches bgs or more may be required in locations where verification samples indicate contamination still remains above MTCA cleanup levels. Based on our review of the soil sample analytical results, we estimate that an excavation depth of 10 inches should remove the contaminated soils. This depth is assumed across the majority of the Site. The total excavation area will be approximately 9,800 square feet, and the volume of soil removed will be approximately 300 cubic yards (cy). Excavation Backfill The contractor must backfill excavations as promptly as possible, but not until confirmation sampling is complete and test results are received. We anticipate that the soil sample results will be available within three days of sample collection. Excavations must be backfilled to be even with the surrounding ground surface, or graded to avoid surface depressions that would collect water. Excavations that are left open overnight must be surrounded by safety fencing. The backfill material must be compacted to a firm condition. The backfill material must be documented clean soil acceptable to City Light, and the Site surface must be covered with acceptable organic topsoil for later re seeding, as specified by City Light. If on site or off site trees or other vegetation are to be protected, selected amended soil backfill may be required, of the type and in locations specified by City Light. Erosion Control and Wet Weather Provisions The contractor must take the following precautions to minimize erosion and saturation of Site soil: Provide erosion and sediment control to prevent transport of sediment off site. In accordance with all applicable regulations, maintain erosion and sediment control until work is completed and accepted by City Light. Develop and implement an Erosion Control Plan compliant with all applicable regulations, and retain appropriately trained and certified personnel on site.

8 Seattle City Light July 17, 2015 Page 8 Protect on site soil from becoming too wet to achieve appropriate compaction by covering stockpiles, sealing exposed soil, and so forth. Schedule earthwork to minimize the potential for erosion, siltation, and disturbance of Site soil. Compact exposed soil to seal and reduce rainwater infiltration, and grade the surface to drain at the end of each work shift. Direct surface water away from fills and excavations. Suspend work if heavy rainfall occurs. Under no circumstances allow runoff from soil to leave the Site or otherwise flow to stormwater conveyance in the street right of way. Take appropriate preventive measures to prevent track out. Grading The contractor must grade work areas, including adjacent transition areas, uniformly. At project completion, the Site must be hand raked level. Soil Disposal Excavated soil and all other materials removed from the Site must be disposed of at a properly permitted and authorized Resource Conservation and Recovery Act (RCRA) Subtitle D facility or at a solid waste landfill meeting the requirements of Chapter of the Washington Administrative Code (WAC), as appropriate. Before remediation activities begin, the contractor must coordinate with City Light to confirm that the disposal facility has profiled the Site soil and City Light has obtained a bill of lading to facilitate transport. The contractor must provide documentation of legal disposal to City Light. Hazardous Building Material Previous investigations have indicated there are areas containing hazardous building materials (HBM) within the existing structure at the Site. These materials will be removed as part of building removal, and are not addressed in this scope. If any additional suspected HBM is encountered, work will be stopped in this area and a certified contractor may be required to sample, handle, and dispose of the material. This contractor should be prepared to handle it according to applicable local, state, and federal guidelines The contractor must provide documentation of legal HBM removal and disposal to City Light. Verification Sampling Before backfilling the excavation, the Environmental Representative will collect verification samples. For planning purposes, assume that approximately one discrete sample will be collected from each

9 Seattle City Light July 17, 2015 Page square foot excavation section. Select sidewall samples will be collected after consultation with City Light. The soil samples will be submitted to OnSite Environmental Inc. on an expedited turnaround time. We anticipate that results will be available within three working days from the day the samples were collected. Key Personnel Role Organization Contact Telephone Number Owner City Light Tom Meyer (206) Owner representative City Light Shannon Straws (206) Contractor TBD TBD TBD Contractor field representative TBD TBD TBD Environmental representative Hart Crowser Ross Stainsby (206) Onsite environmental representative Hart Crowser Nick Galvin (206) Onsite environmental representative Hart Crowser Michael Pagel (206) Schedule The tasks and an approximate schedule for remediation activities are: 1. Obtain necessary permits before [date TBD]. 2. Coordinate soil disposal before [date TBD]. 3. Begin excavation [date TBD]. 4. Conduct confirmation sampling during or immediately following excavation activities. 5. Backfill excavation after receiving confirmation sample analytical results. 6. Project completion no later than [date TBD]. References Ecology Model Toxics Control Act (MTCA) cleanup regulation, chapter WAC. Seattle City Light. Avalon Unit Substation Mercury Remediation Memorandum.

10 Seattle City Light July 17, 2015 Page 10 Attachments: Table 1 Analytical Results for Composite Concrete Samples Table 2 Analytical Results for Composite Soil Samples Table 3 Analytical Results for Composite Subsamples Table 4 Analytical Results for Hand Auger Samples Figure 1 Vicinity Map Figure 2 Site Plan and Composite Soil Sample Results Figure 3 Site Plan and Soil Subsample Results Attachment A Avalon Unit Substation Mercury Remediation Memorandum Attachment B Chemical Data Quality Review and Laboratory Reports L:\Notebooks\ _Former Avalon Substation Site Assessment\Deliverables\Memos\Final Site Assessment\Avalon_Summary Scoping Memo.docx

11 Table 1 - Analytical Results for Composite Concrete Samples Sheet 1 of 1 Sample ID MTCA AV-CONC-1 AV-CONC-2 AV-CONC-3 AV-CONC-4 Sampling Date Method A 3/4/2015 3/4/2015 3/4/2015 3/4/2015 Excavation Depth Screening (inches bgs) Levels PCBs in mg/kg PCB-aroclor U 0.05 U 0.05 U 0.05 U PCB-aroclor U 0.05 U 0.05 U 0.05 U PCB-aroclor U 0.05 U 0.05 U 0.05 U PCB-aroclor U 0.05 U 0.05 U 0.05 U PCB-aroclor U 0.05 U 0.05 U 0.05 U PCB-aroclor U 0.05 U 0.05 U 0.05 U PCB-aroclor U 0.05 U 0.05 U 0.05 U Total PCBs U 0.05 U 0.05 U 0.05 U Metals in mg/kg Arsenic U 10 U Cadmium U 0.92 Chromium 19/2000 a Lead U Mercury U 0.25 U 0.25 U 0.25 U TPH in mg/kg Diesel Range Organics U 510 U U Lube Oil U 50 U Notes: a. 19 mg/kg as chromium VI; 2000 mg/kg as chromium III. U = Not detected at the reporting limit indicated. Boxed value exceeds cleanup level. Hart Crowser L:\Notebooks\ _Former Avalon Substation Site Assessment\Deliverables\Memos\Final Site Assessment\Table 1-4 ChemRslts-Avalon.xlsx

12 Table 2 - Analytical Results for Composite Soil Samples Sheet 1 of 4 Sample ID MTCA AV-COMP1 AV-COMP2 AV-COMP3 AV-COMP4 AV-COMP5 AV-COMP6 AV-COMP7 Sampling Date Method A/ 3/4/2015 3/4/2015 3/4/2015 3/4/2015 3/4/2015 3/4/2015 3/4/2015 Excavation Depth Method B (inches bgs) Screening Levels Pesticides in µg/kg 4,4'-DDD 4,200 a 11 U 12 U 11 U 11 U U 40 4,4'-DDE 2,900 a 11 U 12 U 11 U 11 U 12 U 12 U 21 4,4'-DDT 3, Aldrin 59 a 5.7 U 5.8 U 5.7 U 5.5 U 5.9 U 5.8 U 5.7 U alpha-bhc 160 a 5.7 U 5.8 U 5.7 U 5.5 U 5.9 U 5.8 U 5.7 U beta-bhc 560 a 5.7 U 5.8 U 5.7 U 5.5 U 5.9 U 5.8 U 5.7 U delta-bhc 5.7 U 5.8 U 5.7 U 5.5 U 5.9 U 5.8 U 5.7 U Dieldrin 63 a 11 U 12 U 11 U 11 U 12 U 12 U 11 U Endosulfan I 5.7 U 5.8 U 5.7 U 5.5 U 5.9 U 5.8 U 5.7 U Endosulfan II 11 U 12 U 11 U 11 U 12 U 12 U 11 U Endosulfan Sulfate 480,000 a 11 U 12 U 11 U 11 U 12 U 12 U 11 U Endrin 24,000 a 11 U 12 U 11 U 11 U 12 U 12 U 11 U Endrin Aldehyde 11 U 12 U 11 U 11 U 12 U 12 U 11 U Endrin Ketone 11 U 12 U 11 U 11 U U 11 U gamma-bhc U 5.8 U 5.7 U 5.5 U 5.9 U 5.8 U 5.7 U alpha-chlordane 11 U 12 U 11 U 11 U 12 U 12 U 11 U gamma-chlordane 11 U 12 U 11 U 11 U 12 U 12 U 11 U Total Chlordane 2,900 a 11 U 12 U 11 U 11 U 12 U 12 U 11 U Heptachlor 220 a 5.7 U 5.8 U 5.7 U 5.5 U 5.9 U 5.8 U 5.7 U Heptachlor Epoxide 110 a 5.7 U 5.8 U 5.7 U 5.5 U 5.9 U 5.8 U 5.7 U Methoxychlor 400,000 a 11 U 12 U 11 U 11 U 12 U 12 U 11 U Toxaphene 910 a 57 U 58 U 57 U 55 U 59 U 58 U 57 U PCBs in mg/kg PCB-aroclor U U U PCB-aroclor U U U PCB-aroclor U U U PCB-aroclor U U U PCB-aroclor U U U PCB-aroclor U U U PCB-aroclor U U Total PCBs U U Hart Crowser L:\Notebooks\ _Former Avalon Substation Site Assessment\Deliverables\Memos\Final Site Assessment\Table 1-4 ChemRslts-Avalon.xlsx

13 Table 2 - Analytical Results for Composite Soil Samples Sheet 2 of 4 Sample ID MTCA AV-COMP1 AV-COMP2 AV-COMP3 AV-COMP4 AV-COMP5 AV-COMP6 AV-COMP7 Sampling Date Method A/ 3/4/2015 3/4/2015 3/4/2015 3/4/2015 3/4/2015 3/4/2015 3/4/2015 Excavation Depth Method B (inches bgs) Screening Levels Herbicides in µg/kg 2,4,5-T 800,000 a 11 U 11 U 11 U 10 U 11 U 11 U 11 U 2,4-D 800,000 a 11 U 11 U 11 U 10 U 11 U 11 U 11 U 2,4-DB 640,000 a 11 U 11 U 11 U 10 U 11 U 11 U 11 U Dalapon (DPA) 2.4E06 a 260 U 270 U 260 U 250 U 270 U 260 U 260 U Dicamba 2.4E06 a 11 U 11 U 11 U 10 U 11 U 11 U 11 U Dichlorprop 81 U 82 U 81 U 77 U 84 U 82 U 81 U Dinoseb 80,000 a 11 U 11 U 11 U 10 U 11 U 11 U 11 U MCPA 40,000 a 1100 U 1100 U 1100 U 1000 U 1100 U 1100 U 1100 U Mecoprop 8,000 a 3000 U 3000 U 3000 U 3000 U 3000 U 3000 U 3000 U Pentachlorophenol 400,000 a 5.5 U 5.5 U U 5.4 U Silvex 640,000 a 11 U 11 U 11 U 10 U 11 U 11 U 11 U Metals in mg/kg Arsenic U U U 11 U Cadmium U Chromium 19/2000 b Lead Mercury U 0.29 U 0.29 U 0.27 U 0.3 U 0.29 U 0.47 TCLP Metals in mg/l Lead 0.22 Mercury TPH in mg/kg Diesel Range Organics U 92 U 66 U 39 U 150 U 54 U 93 Lube Oil Hart Crowser L:\Notebooks\ _Former Avalon Substation Site Assessment\Deliverables\Memos\Final Site Assessment\Table 1-4 ChemRslts-Avalon.xlsx

14 Table 2 - Analytical Results for Composite Soil Samples Sheet 3 of 4 Sample ID MTCA AV-COMP8 AV-COMP9 AV-COMP10 AV-COMP11 AV-COMP12 AV-COMP13 AV-COMP14 AV-COMP15 Sampling Date Method A/ 3/5/2015 3/5/2015 3/5/2015 3/5/2015 3/5/2015 3/5/2015 3/5/2015 4/24/2015 Excavation Depth Method B (inches bgs) Screening Levels Pesticides in µg/kg 4,4'-DDD 4,200 a 12 U 13 U 13 U U 13 U 13 U 13 U 4,4'-DDE 2,900 a 12 U U 13 U 13 U 150 4,4'-DDT 3, U 13 U 13 U 150 Aldrin 59 a 6.2 U 6.7 U 6.5 U 7.3 U 6.1 U 6.3 U 6.7 U 29 alpha-bhc 160 a 6.2 U 6.7 U 6.5 U 7.3 U 6.1 U 6.3 U 6.7 U 6.5 U beta-bhc 560 a 6.2 U 6.7 U 6.5 U 7.3 U 6.1 U 6.3 U 6.7 U 6.5 U delta-bhc 6.2 U 6.7 U 6.5 U 7.3 U 6.1 U 6.3 U 6.7 U 6.5 U Dieldrin 63 a U 13 U 13 U 2900 Endosulfan I 6.2 U 6.7 U 6.5 U 7.3 U 6.1 U 6.3 U 6.7 U 6.5 U Endosulfan II 12 U 13 U 13 U 15 U 12 U 13 U 13 U 13 U Endosulfan Sulfate 480,000 a 12 U 13 U 13 U 15 U 12 U 13 U 13 U 13 U Endrin 24,000 a 12 U 13 U 13 U 15 U 12 U 13 U 13 U 13 U Endrin Aldehyde 12 U 13 U 13 U 15 U 12 U 13 U 13 U 13 U Endrin Ketone 12 U 13 U 13 U 15 U 12 U 13 U 13 U 13 U gamma-bhc U 6.7 U 6.5 U 7.3 U 6.1 U 6.3 U 6.7 U 6.5 U alpha-chlordane 12 U 13 U 13 U 15 U 12 U 13 U 13 U 13 U gamma-chlordane 12 U 13 U 13 U 15 U 12 U 13 U 13 U 13 U Total Chlordane 2,900 a 12 U 13 U 13 U 15 U 12 U 13 U 13 U 13 U Heptachlor 220 a 6.2 U 6.7 U 6.5 U 7.3 U 6.1 U 6.3 U 6.7 U 6.5 U Heptachlor Epoxide 110 a 6.2 U 6.7 U 6.5 U 7.3 U 6.1 U 6.3 U 6.7 U 6.5 U Methoxychlor 400,000 a 12 U 13 U 13 U 15 U 12 U 13 U 13 U 13 U Toxaphene 910 a 62 U 67 U 65 U 73 U 61 U 63 U 67 U 65 U PCBs in mg/kg PCB-aroclor 1016 PCB-aroclor 1221 PCB-aroclor 1232 PCB-aroclor 1242 PCB-aroclor 1248 PCB-aroclor 1254 PCB-aroclor 1260 Total PCBs 1.0 Hart Crowser L:\Notebooks\ _Former Avalon Substation Site Assessment\Deliverables\Memos\Final Site Assessment\Table 1-4 ChemRslts-Avalon.xlsx

15 Table 2 - Analytical Results for Composite Soil Samples Sheet 4 of 4 Sample ID MTCA Sampling Date Method A/ Excavation Depth Method B (inches bgs) Screening Levels Herbicides in µg/kg 2,4,5-T 800,000 a 2,4-D 800,000 a 2,4-DB 640,000 a Dalapon (DPA) 2.4E06 a Dicamba 2.4E06 a Dichlorprop Dinoseb 80,000 a MCPA 40,000 a Mecoprop 8,000 a Pentachlorophenol 400,000 a Silvex 640,000 a Metals in mg/kg Arsenic 20 Cadmium 2 Chromium 19/2000 b Lead 250 Mercury 2 TCLP Metals in mg/l Lead Mercury TPH in mg/kg Diesel Range Organics 2000 Lube Oil 2000 AV-COMP8 AV-COMP9 AV-COMP10 AV-COMP11 AV-COMP12 AV-COMP13 AV-COMP14 AV-COMP15 3/5/2015 3/5/2015 3/5/2015 3/5/2015 3/5/2015 3/5/2015 3/5/2015 4/24/ U 13 U 12 U 14 U 12 U 12 U 13 U U U 12 U U 13 U 12 U 14 U 12 U 12 U 13 U 280 U 310 U 300 U 340 U 280 U 290 U 310 U 12 U 13 U 12 U 14 U 11 U 12 U 13 U 87 U 95 U 93 U 100 U 87 U 89 U 95 U 12 U 13 U 12 U 14 U 12 U 12 U 13 U 1200 U 1300 U 1200 U 1400 U 1100 U 1200 U 1200 U 3000 U 3000 U 3000 U 3000 U 3000 U 3000 U 3000 U U 6.2 U 7 U 5.8 U 6 U 6.3 U 12 U 13 U 12 U 14 U 12 U 12 U 13 U 12 U 13 U 13 U 15 U 12 U U 13 U U 0.65 U 0.73 U U 0.67 U U 0.33 U 0.37 U 0.31 U 0.31 U 0.33 U 0.33 U U U Notes: a. MTCA Method B screening level using the lowest direct contact cleanup level in Ecology's CLARC database. b. 19 mg/kg as chromium VI; 2000 mg/kg as chromium III. U = Not detected at the reporting limit indicated. Boxed value exceeds cleanup level. Hart Crowser L:\Notebooks\ _Former Avalon Substation Site Assessment\Deliverables\Memos\Final Site Assessment\Table 1-4 ChemRslts-Avalon.xlsx

16 Table 3 - Analytical Results for Composite Subsamples Sheet 1 of 6 Sample ID MTCA AV-COMP2-SS1 AV-COMP2-SS2 AV-COMP2-SS3 AV-COMP2-SS4 AV-COMP2-SS5 AV-COMP3-SS1 Sampling Date Method A 3/4/2015 3/4/2015 3/4/2015 3/4/2015 3/4/2015 3/4/2015 Excavation Depth Screening (inches bgs) Levels PCBs in mg/kg PCB-aroclor 1016 PCB-aroclor 1221 PCB-aroclor 1232 PCB-aroclor 1242 PCB-aroclor 1248 PCB-aroclor 1254 PCB-aroclor 1260 Total PCBs 1.0 Metals in mg/kg Arsenic 20 Cadmium U U Chromium 19/2000 a Lead Mercury 2 TCLP Metals in mg/l Lead 0.21 Hart Crowser L:\Notebooks\ _Former Avalon Substation Site Assessment\Deliverables\Memos\Final Site Assessment\Table 1-4 ChemRslts-Avalon.xlsx

17 Table 3 - Analytical Results for Composite Subsamples Sheet 2 of 6 Sample ID Sampling Date Excavation Depth (inches bgs) MTCA Method A Screening Levels AV-COMP3-SS2 AV-COMP3-SS3 AV-COMP3-SS4 AV-COMP5-SS1 AV-COMP5-SS2 AV-COMP5-SS3 3/4/2015 3/4/2015 3/4/2015 3/4/2015 3/4/2015 3/4/2015 PCBs in mg/kg PCB-aroclor 1016 PCB-aroclor 1221 PCB-aroclor 1232 PCB-aroclor 1242 PCB-aroclor 1248 PCB-aroclor 1254 PCB-aroclor 1260 Total PCBs 1.0 Metals in mg/kg Arsenic 20 Cadmium 2 Chromium 19/2000 a Lead 250 Mercury 2 TCLP Metals in mg/l Lead Hart Crowser L:\Notebooks\ _Former Avalon Substation Site Assessment\Deliverables\Memos\Final Site Assessment\Table 1-4 ChemRslts-Avalon.xlsx

18 Table 3 - Analytical Results for Composite Subsamples Sheet 3 of 6 Sample ID Sampling Date Excavation Depth (inches bgs) MTCA Method A Screening Levels AV-COMP5-SS4 AV-COMP6-SS1 AV-COMP6-SS2 AV-COMP6-SS3 AV-COMP7-SS1 AV-COMP7-SS2 3/4/2015 3/4/2015 3/4/2015 3/4/2015 3/4/2015 3/4/2015 PCBs in mg/kg PCB-aroclor 1016 PCB-aroclor 1221 PCB-aroclor 1232 PCB-aroclor 1242 PCB-aroclor 1248 PCB-aroclor 1254 PCB-aroclor 1260 Total PCBs 1.0 Metals in mg/kg Arsenic 20 Cadmium 2 Chromium 19/2000 a Lead 250 Mercury 2 TCLP Metals in mg/l Lead U U U U U U U U U U U U U U U U U U U U U U Hart Crowser L:\Notebooks\ _Former Avalon Substation Site Assessment\Deliverables\Memos\Final Site Assessment\Table 1-4 ChemRslts-Avalon.xlsx

19 Table 3 - Analytical Results for Composite Subsamples Sheet 4 of 6 Sample ID MTCA AV-COMP7-SS3 AV-COMP7-SS4 Sampling Date Method A 3/4/2015 3/4/2015 Excavation Depth Screening (inches bgs) Levels PCBs in mg/kg PCB-aroclor 1016 PCB-aroclor 1221 PCB-aroclor 1232 PCB-aroclor 1242 PCB-aroclor 1248 PCB-aroclor 1254 PCB-aroclor 1260 Total PCBs 1.0 Metals in mg/kg Arsenic 20 Cadmium 2 Chromium 19/2000 a Lead 250 Mercury 2 TCLP Metals in mg/l Lead U 0.3 U Hart Crowser L:\Notebooks\ _Former Avalon Substation Site Assessment\Deliverables\Memos\Final Site Assessment\Table 1-4 ChemRslts-Avalon.xlsx

20 Table 3 - Analytical Results for Composite Subsamples Sheet 5 of 6 Sample ID Sampling Date Excavation Depth (inches bgs) MTCA Method A Screening Levels AV-COMP8-SS1 AV-COMP8-SS2 AV-COMP8-SS3 AV-COMP11-SS1 AV-COMP11-SS2 AV-COMP11-SS3 3/5/2015 3/5/2015 3/5/2015 3/5/2015 3/5/2015 3/5/2015 PCBs in mg/kg PCB-aroclor 1016 PCB-aroclor 1221 PCB-aroclor 1232 PCB-aroclor 1242 PCB-aroclor 1248 PCB-aroclor 1254 PCB-aroclor 1260 Total PCBs 1.0 Metals in mg/kg Arsenic 20 Cadmium 2 Chromium 19/2000 a Lead 250 Mercury 2 TCLP Metals in mg/l Lead U 0.34 U Hart Crowser L:\Notebooks\ _Former Avalon Substation Site Assessment\Deliverables\Memos\Final Site Assessment\Table 1-4 ChemRslts-Avalon.xlsx

21 Table 3 - Analytical Results for Composite Subsamples Sheet 6 of 6 Sample ID Sampling Date Excavation Depth (inches bgs) MTCA Method A Screening Levels AV-COMP11-SS4 AV-COMP11-SS5 AV-COMP13-SS1 AV-COMP13-SS2 AV-COMP13-SS3 3/5/2015 3/5/2015 3/5/2015 3/5/2015 3/5/2015 PCBs in mg/kg PCB-aroclor 1016 PCB-aroclor 1221 PCB-aroclor 1232 PCB-aroclor 1242 PCB-aroclor 1248 PCB-aroclor 1254 PCB-aroclor 1260 Total PCBs 1.0 Metals in mg/kg Arsenic 20 Cadmium 2 Chromium 19/2000 a Lead 250 Mercury 2 TCLP Metals in mg/l Lead Notes: a. 19 mg/kg as chromium VI; 2000 mg/kg as chromium III. U = Not detected at the reporting limit indicated. Boxed value exceeds cleanup level. Hart Crowser L:\Notebooks\ _Former Avalon Substation Site Assessment\Deliverables\Memos\Final Site Assessment\Table 1-4 ChemRslts-Avalon.xlsx

22 Table 4 - Analytical Results for Hand Auger Samples Sheet 1 of 2 Sample ID MTCA AV-CORE " AV-CORE " AV-CORE " AV-CORE " AV-CORE " AV-CORE " Sampling Date Method A/ 4/24/2015 4/24/2015 4/24/2015 4/24/2015 4/24/2015 4/24/2015 Excavation Depth Method B (inches bgs) Screening Levels Pesticides in µg/kg Dieldrin 63 a PCBs in mg/kg PCB-aroclor U U PCB-aroclor U U PCB-aroclor U U PCB-aroclor U U PCB-aroclor U U PCB-aroclor U U PCB-aroclor U U Total PCBs U U Metals in mg/kg Arsenic 20 Cadmium U 0.55 U 0.57 U Chromium 19/2000 b Lead U Mercury U Hart Crowser L:\Notebooks\ _Former Avalon Substation Site Assessment\Deliverables\Memos\Final Site Assessment\Table 1-4 ChemRslts-Avalon.xlsx

23 Table 4 - Analytical Results for Hand Auger Samples Sheet 2 of 2 Sample ID MTCA Sampling Date Method A/ Excavation Depth Method B (inches bgs) Screening Levels Pesticides in µg/kg Dieldrin 63 a PCBs in mg/kg PCB-aroclor 1016 PCB-aroclor 1221 PCB-aroclor 1232 PCB-aroclor 1242 PCB-aroclor 1248 PCB-aroclor 1254 PCB-aroclor 1260 Total PCBs 1.0 Metals in mg/kg Arsenic 20 Cadmium 2 Chromium 19/2000 b Lead 250 Mercury 2 AV-CORE " AV-CORE " 4/24/2015 4/24/ U 11 U U Notes: a. MTCA Method B screening level using the lowest direct contact cleanup level in Ecology's CLARC database. b. 19 mg/kg as chromium VI; 2000 mg/kg as chromium III. U = Not detected at the reporting limit indicated. Boxed value exceeds cleanup level. Hart Crowser L:\Notebooks\ _Former Avalon Substation Site Assessment\Deliverables\Memos\Final Site Assessment\Table 1-4 ChemRslts-Avalon.xlsx

24 Seattle WASHINGTON Idaho Oregon Project Location Document Path: C:\Users\melissaschweitzer\Desktop\Avalon\GIS\ _VMap-Avalon.mxd Date: 3/23/2015 User Name: melissaschweitzer 0 1,000 2,000 4,000 Feet Sources: Esri, HERE, DeLorme, USGS, Intermap, increment P Corp., NRCAN, Esri Japan, METI, Esri China (Hong Kong), Esri (Thailand), TomTom, MapmyIndia, OpenStreetMap contributors, and the GIS User Community N Avalon Surplus Property Seattle, Washington Vicinity Map /15 Figure 1

25 N Scale in Feet SW Genesee Street File: L:\Notebooks\ _Former Avalon Substation Site Assessment\CAD\ _SP-Avalon.dwg Layout:Composites Date: Author: melissaschweitzer 35th Avenue SW Abandoned Retail Building Abandoned City Light Building Pesticide Concentrations in µg/kg, Metals, Lube Oil, and PCB Concentrations in mg/kg Avalon Surplus Property Seattle, Washington Bold Red Value Exceeds MTCA Cleanup Level Hand Auger Characterization Sample Composite Subsample Composite Concrete Sample Composite Soil Sample Limits Composite Concrete Sample Limits Area to be Excavated from 10" BGS (minimum) to 16" BGS Site Plan and Composite Soil Sample Results /15 Figure 2

26 ATTACHMENT A Avalon Unit Substation Mercury Remediation Memorandum July 17, 2015

27 Memorandum To: From: File Larry Garcia Date: 5/1/2015 Re: Avalon Unit Substation Mercury Remediation Avalon Unit Substation formerly housed rectifiers for the trolley system in Seattle. These rectifiers were mercury filled devices and were removed in the 1960s. As part of the mercury investigations prompted by the mercury spill from a manometer at Bothell substation in 2008, an initial investigation was conducted at Avalon in October of Initial readings were taken with the Lumex RA-915 and ambient readings in the building were around 300 ng/m 3. Although this is well below the EPA reoccupancy level of 1,300 ng/m 3 or the L&I PEL (Permissible Exposure Limit) of 50,000 ng/m 3, it indicated the presence of a mercury source. Exterior readings were found to be at background levels. The building was added to the cleanup list. The building has one trench that was formerly used for conduit to connect electrical equipment. The lone trench extends nearly the entire length of the building (see diagram D and photo Avalon.trench1). Monitoring at the trench edges ranged from 500 to 17,000 ng/m 3. The remediation began in the summer of A contractor was mobilized to remove or contain the mercury in full compliance with hazardous waste site operations requirements (chemical protective clothing, mercury vapor cartridges). Although vapor concentrations never exceeded the PEL, respirators were worn as a precaution during activities that could result in mercury exposure. The highest reading recorded was 38,000 ng/m 3. Surficial contamination in the trench was treated with repeated applications of HgX. HgX bonds to the mercury and then is removed with a mercury vacuum. The HgX, liquid mercury and PPE were disposed of as dangerous waste. Some residual mercury on the trench surface was coated with epoxy paint to keep the vapor down. This area is easily recognized by the white coating that clearly differs from the natural coating. All of the surfaces coated in this manner emitted mercury below the EPA industrial reoccupancy level of 1,300 ng/m 3. A drain in the trench was the source of the highest mercury vapor concentrations. A catch basin in the yard behind the building produced no mercury vapor. Two roof drains were plumbed to drain lines that intercepted the trench drain. Both roof drains were re-plumbed to the exterior of the building. The floor drain line was intercepted behind the building. The mercury vapor readings dissipated quickly with distance from the building, indicating that the mercury was likely in a p-trap under the drain. The line was plugged on both ends and filled with concrete to solidify the mercury for any future pipe removal. Remediation of all mercury on the site (for sale of the property or demolishing of the building) would require the removal of the area under the white epoxy coating and the removal of the concrete filled drain pipe. A 1

28 May 1, 2015 Mercury vapor scrubbers were used to remove vaporized mercury in the building. Upon completion of the project, ambient concentrations of mercury were measured at 80 ng/m 3, well below the ATSDR Minimal Risk Level of 200 ng/m 3. 2

29 ATTACHMENT B Chemical Data Quality Review and Laboratory Reports July 17, 2015

30 ATTACHMENT B CHEMICAL DATA QUALITY REVIEW AND LABORATORY REPORTS Soil Sample Submittals for Avalon Substation Property In total, 85 soil or concrete samples were submitted to OnSite Environmental Inc. (OnSite) analytical laboratory in Redmond, Washington. A subset of these samples were selected for analysis; details of these as follows: Nine soil samples were collected on April 24, 2015, and submitted to OnSite on the same day. The analytical results were reported as Laboratory Reference Nos and B. Thirty soil samples were collected on March 4, 2015, and submitted to OnSite on March 5, The analytical results were reported as Laboratory Reference Nos , B, and C. Eighteen soil samples were collected on March 5, 2015, and submitted to OnSite that day. The analytical results were reported as Laboratory Reference Nos and B. The soil samples were analyzed for: Total metals (As, Cd, Cr, Pb, and Hg) by EPA 6010C/7471B; Toxicity characteristic leaching procedure (TCLP) for lead by EPA Method 1311/6010C; Toxicity characteristic leaching procedure (TCLP) for mercury by EPA Method 1311/7470A; Organochlorine pesticides by 8081B; Polychlorinated biphenyls by EPA 8082A; Diesel and lube oil range organics by NWTPH Dx; Chlorinated herbicides by 8151A; and Total moisture by Standard Method 2540B. Chemical Data Quality Review The laboratory performed ongoing quality assurance/quality control (QA/QC) reviews. Hart Crowser reviewed the data to check that they met quality objectives for the project. The following criteria were evaluated: Holding times; Method blanks; Surrogate recoveries; Laboratory control sample (LCS) recoveries; Matrix spike/matrix spike duplicate (MS/MSD) recoveries; Continuing calibration verifications; July 17, 2015

31 B-2 Attachment B Laboratory duplicate relative percent differences (RPDs); and Reporting limits (RLs). The full laboratory results are at the end of this document. Results of the QA/QC review are below. Sample Receiving Discrepancies No sample discrepancies were noted in sample receiving or on the chain of custody (COC) record. Total Metals (As, Cd, Cr, Pb, and Hg) by EPA 6010C/7471B The required holding times were met. Reporting limits were acceptable. No method blank contamination was detected. LCS recoveries were within laboratory control limits. Laboratory duplicate and LCS RPDs were within control limits, with the following exceptions: Laboratory Reference No B. The laboratory flagged the lead results with a C, indicating an exceedance of the control limit because of high result variability when analyte concentrations are within five times the quantitation limit. No results were qualified since the duplicate was a laboratory batch quality control sample and the MS/MSD was within control limits. Laboratory Reference No B. The laboratory flagged the result for chromium with a K, indicating that the sample duplicate RPD was outside control limits because of sample inhomogeneity. The sample was re extracted and re analyzed with similar results. No results were qualified since the duplicate was a laboratory batch quality control sample and the MS/MSD was within control limits. MS/MSD RPDs were within laboratory control limits. The data are acceptable for use without qualification. TCLP Lead The required holding times were met. Reporting limits were acceptable. No method blank contamination was detected. Surrogate and LCS recoveries were within laboratory control limits. Laboratory duplicate and LCS RPDs were within control limits. MS/MSD RPDs were within laboratory control limits. The data are acceptable for use without qualification. TCLP Mercury The required holding times were met. Reporting limits were acceptable. No method blank contamination was detected. Surrogate and LCS recoveries were within laboratory control limits. Laboratory duplicate and LCS RPDs were within control limits. MS/MSD RPDs were within laboratory control limits. The data are acceptable for use without qualification July 17, 2015

32 B-3 Attachment B Organochlorine Pesticides by 8081B The required holding times were met. Reporting limits were acceptable. No method blank contamination was detected. Surrogate recoveries were within laboratory control limits. Laboratory control samples were within control limits. MS/MSD and RPDs were within laboratory control limits. Continuing calibration verification recoveries were within laboratory control limits with the following exceptions: Laboratory Reference No Continuing calibration verification (CCV) results were within the control limits except the lab noted that in the CCV, (1) for samples AV COMP4 and AV COMP6, recoveries were low for 4,4 DDT and endrin aldehyde, and (2) for samples AV COMP5 and AV COMP7, recoveries were low for methoxychlor and gamma chlordane, 4,4 DDT, endrin aldehyde, and methoxychlor. The lab re injected the sample extracts with similar results and attributed the failure to the matrix of these samples. Results for these analytes for these samples were qualified with J/UJ. Laboratory Reference No CCV results were within the control limits except the lab noted that in the CCV, (1) for samples AV COMP8 and AV COMP11, recoveries were low for 4,4 DDT and endrin aldehyde, and (2) for samples AV COMP13 and AV COMP14, recoveries were low for methoxychlor and gamma chlordane, 4,4 DDT, endrin aldehyde, and methoxychlor. The lab reinjected the sample extracts with similar results and attributed the failure to the matrix of these samples. Results for these analytes for these samples were qualified with J/UJ. Polychlorinated Biphenyls by EPA 8082A The required holding times were met. Reporting limits were acceptable. No method blank contamination was detected. Surrogate recoveries were within laboratory control limits or were not available because of necessary dilution of the sample. Laboratory control sample RPD was within laboratory control limits. The data are acceptable for use without qualification. Diesel- and Lube-Oil-Range Organics by NWTPH-Dx The required holding times were met. Reporting limits were acceptable, with the following exceptions: Laboratory Reference No The reporting limits for samples AV CONC 1, AV COMP2, AV COMP3, AV COMP4, AV COMP5, and AV COMP6 were elevated because of interferences present in the sample. Laboratory Reference No The laboratory noted that the hydrocarbons in the lube range are impacting the diesel range results in sample AV COMP8. No method blank contamination was detected. Surrogate recoveries were within laboratory control limits or were not available because of necessary dilution of the sample. Laboratory control sample RPD was within laboratory control limits. The data are acceptable for use without qualification July 17, 2015

33 B-4 Attachment B Chlorinated Acid Herbicides by 8151A The required holding times were met. Reporting limits were acceptable. No method blank contamination was detected. Surrogate recoveries were within laboratory control limits. MS/MSD and LCS RPDs were within laboratory control limits. The data are acceptable for use without qualification. Total Moisture by Standard Method 2540B The required holding times were met. The data are acceptable for use without qualification July 17, 2015

34 LABORATORY REPORTS July 17, 2015

35 14648 NE 95 th Street, Redmond, WA (425) March 20, 2015 Ross Stainsby Hart Crowser, Inc Westlake Avenue North, Suite 200 Seattle, WA Re: Analytical Data for Project Laboratory Reference No Dear Ross: Enclosed are the analytical results and associated quality control data for samples submitted on March 5, The standard policy of OnSite Environmental, Inc. is to store your samples for 30 days from the date of receipt. If you require longer storage, please contact the laboratory. We appreciate the opportunity to be of service to you on this project. If you have any questions concerning the data, or need additional information, please feel free to call me. Sincerely, David Baumeister Project Manager Enclosures

36 2 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: Case Narrative Samples were collected on March 4, 2015 and received by the laboratory on March 5, They were maintained at the laboratory at a temperature of 2 o C to 6 o C. General QA/QC issues associated with the analytical data enclosed in this laboratory report will be indicated with a reference to a comment or explanation on the Data Qualifier page. More complex and involved QA/QC issues will be discussed in detail below. Organochlorine Pesticides by EPA 8081B Analysis Due to negative effects of the matrix from samples AV-COMP4 and AV-COMP6 on the instrument, values for 4,4 - DDT, Endrin Aldehyde, and Methoxychlor in the continuing calibration verification standards (CCVs) were low. Samples AV-COMP5 and AV-COMP7 caused gamma-chlordane, 4 -DDT, Endrin Aldehyde, and Methoxychlor to be low in their closing CCV. Since the degradation of the CCV standards was reproducible after re-injecting the sample extracts, the CCV degradation problem was attributed to the matrix of these samples. Any other QA/QC issues associated with this extraction and analysis will be indicated with a footnote reference and discussed in detail on the Data Qualifier page.

37 3 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: NWTPH-Dx Matrix: Soil Units: mg/kg (ppm) Date Date Analyte Result PQL Method Prepared Analyzed Flags AV-CONC-1 Laboratory ID: Diesel Range Organics ND 74 NWTPH-Dx U1 Lube Oil NWTPH-Dx Surrogate: Percent Recovery Control Limits o-terphenyl AV-CONC-2 Laboratory ID: Diesel Range Organics ND 510 NWTPH-Dx U1 Lube Oil NWTPH-Dx Surrogate: Percent Recovery Control Limits o-terphenyl AV-CONC-3 Laboratory ID: Diesel Range Organics NWTPH-Dx Lube Oil Range Organics ND 200 NWTPH-Dx U1 Surrogate: Percent Recovery Control Limits o-terphenyl AV-CONC-4 Laboratory ID: Diesel Range Organics ND 25 NWTPH-Dx Lube Oil Range Organics ND 50 NWTPH-Dx Surrogate: Percent Recovery Control Limits o-terphenyl AV-COMP1 Laboratory ID: Diesel Range Organics ND 29 NWTPH-Dx Lube Oil NWTPH-Dx Surrogate: Percent Recovery Control Limits o-terphenyl AV-COMP2 Laboratory ID: Diesel Range Organics ND 92 NWTPH-Dx U1 Lube Oil NWTPH-Dx Surrogate: Percent Recovery Control Limits o-terphenyl

38 4 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: NWTPH-Dx Matrix: Soil Units: mg/kg (ppm) Date Date Analyte Result PQL Method Prepared Analyzed Flags AV-COMP3 Laboratory ID: Diesel Range Organics ND 66 NWTPH-Dx U1 Lube Oil NWTPH-Dx Surrogate: Percent Recovery Control Limits o-terphenyl AV-COMP4 Laboratory ID: Diesel Range Organics ND 39 NWTPH-Dx U1 Lube Oil NWTPH-Dx Surrogate: Percent Recovery Control Limits o-terphenyl AV-COMP5 Laboratory ID: Diesel Range Organics ND 150 NWTPH-Dx U1 Lube Oil NWTPH-Dx Surrogate: Percent Recovery Control Limits o-terphenyl AV-COMP6 Laboratory ID: Diesel Range Organics ND 54 NWTPH-Dx U1 Lube Oil NWTPH-Dx Surrogate: Percent Recovery Control Limits o-terphenyl AV-COMP7 Laboratory ID: Diesel Range Organics NWTPH-Dx Lube Oil Range Organics NWTPH-Dx Surrogate: Percent Recovery Control Limits o-terphenyl

39 5 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: NWTPH-Dx QUALITY CONTROL Matrix: Soil Units: mg/kg (ppm) Date Date Analyte Result PQL Method Prepared Analyzed Flags METHOD BLANK Laboratory ID: MB0310S2 Diesel Range Organics ND 25 NWTPH-Dx Lube Oil Range Organics ND 50 NWTPH-Dx Surrogate: Percent Recovery Control Limits o-terphenyl Source Percent Recovery RPD Analyte Result Spike Level Result Recovery Limits RPD Limit Flags DUPLICATE Laboratory ID: ORIG DUP Diesel Range ND ND NA NA NA NA NA NA U1 Lube Oil NA NA NA NA 17 NA Surrogate: o-terphenyl Laboratory ID: ORIG DUP Diesel Range ND ND NA NA NA NA NA NA U1 Lube Oil NA NA NA NA 18 NA Surrogate: o-terphenyl SPIKE BLANK Laboratory ID: SB0310S2 Diesel Fuel # NA NA NA Surrogate: o-terphenyl

40 6 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: PCBs EPA 8082A Matrix: Concrete Units: mg/kg (ppm) Date Date Analyte Result PQL Method Prepared Analyzed Flags AV-CONC-1 Laboratory ID: Aroclor 1016 ND EPA 8082A Aroclor 1221 ND EPA 8082A Aroclor 1232 ND EPA 8082A Aroclor 1242 ND EPA 8082A Aroclor 1248 ND EPA 8082A Aroclor 1254 ND EPA 8082A Aroclor 1260 ND EPA 8082A Surrogate: Percent Recovery Control Limits DCB AV-CONC-2 Laboratory ID: Aroclor 1016 ND EPA 8082A Aroclor 1221 ND EPA 8082A Aroclor 1232 ND EPA 8082A Aroclor 1242 ND EPA 8082A Aroclor 1248 ND EPA 8082A Aroclor 1254 ND EPA 8082A Aroclor 1260 ND EPA 8082A Surrogate: Percent Recovery Control Limits DCB AV-CONC-3 Laboratory ID: Aroclor 1016 ND EPA 8082A Aroclor 1221 ND EPA 8082A Aroclor 1232 ND EPA 8082A Aroclor 1242 ND EPA 8082A Aroclor 1248 ND EPA 8082A Aroclor 1254 ND EPA 8082A Aroclor 1260 ND EPA 8082A Surrogate: Percent Recovery Control Limits DCB

41 7 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: PCBs EPA 8082A Matrix: Concrete/Soil Units: mg/kg (ppm) Date Date Analyte Result PQL Method Prepared Analyzed Flags AV-CONC-4 Laboratory ID: Aroclor 1016 ND EPA 8082A Aroclor 1221 ND EPA 8082A Aroclor 1232 ND EPA 8082A Aroclor 1242 ND EPA 8082A Aroclor 1248 ND EPA 8082A Aroclor 1254 ND EPA 8082A Aroclor 1260 ND EPA 8082A Surrogate: Percent Recovery Control Limits DCB AV-COMP1 Laboratory ID: Aroclor 1016 ND EPA 8082A Aroclor 1221 ND EPA 8082A Aroclor 1232 ND EPA 8082A Aroclor 1242 ND EPA 8082A Aroclor 1248 ND EPA 8082A Aroclor 1254 ND EPA 8082A Aroclor 1260 ND EPA 8082A Surrogate: Percent Recovery Control Limits DCB AV-COMP3 Laboratory ID: Aroclor 1016 ND EPA 8082A Aroclor 1221 ND EPA 8082A Aroclor 1232 ND EPA 8082A Aroclor 1242 ND EPA 8082A Aroclor 1248 ND EPA 8082A Aroclor 1254 ND EPA 8082A Aroclor 1260 ND EPA 8082A Surrogate: Percent Recovery Control Limits DCB

42 8 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: PCBs EPA 8082A Matrix: Soil Units: mg/kg (ppm) Date Date Analyte Result PQL Method Prepared Analyzed Flags AV-COMP6 Laboratory ID: Aroclor 1016 ND EPA 8082A Aroclor 1221 ND EPA 8082A Aroclor 1232 ND EPA 8082A Aroclor 1242 ND EPA 8082A Aroclor 1248 ND EPA 8082A Aroclor 1254 ND EPA 8082A Aroclor EPA 8082A Surrogate: Percent Recovery Control Limits DCB

43 9 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: PCBs EPA 8082A QUALITY CONTROL Matrix: Soil Units: mg/kg (ppm) Date Date Analyte Result PQL Method Prepared Analyzed Flags METHOD BLANK Laboratory ID: MB0313S2 Aroclor 1016 ND EPA 8082A Aroclor 1221 ND EPA 8082A Aroclor 1232 ND EPA 8082A Aroclor 1242 ND EPA 8082A Aroclor 1248 ND EPA 8082A Aroclor 1254 ND EPA 8082A Aroclor 1260 ND EPA 8082A Surrogate: Percent Recovery Control Limits DCB Source Percent Recovery RPD Analyte Result Spike Level Result Recovery Limits RPD Limit Flags MATRIX SPIKES Laboratory ID: MS MSD MS MSD MS MSD Aroclor ND Surrogate: DCB SPIKE BLANK Laboratory ID: SB0313S2 Aroclor N/A Surrogate: DCB

44 10 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: ORGANOCHLORINE PESTICIDES EPA 8081B Matrix: Soil Units: ug/kg (ppb) Date Date Analyte Result PQL Method Prepared Analyzed Flags AV-COMP1 Laboratory ID: alpha-bhc ND 5.7 EPA 8081B gamma-bhc ND 5.7 EPA 8081B beta-bhc ND 5.7 EPA 8081B delta-bhc ND 5.7 EPA 8081B Heptachlor ND 5.7 EPA 8081B Aldrin ND 5.7 EPA 8081B Heptachlor Epoxide ND 5.7 EPA 8081B gamma-chlordane ND 11 EPA 8081B alpha-chlordane ND 11 EPA 8081B ,4'-DDE ND 11 EPA 8081B Endosulfan I ND 5.7 EPA 8081B Dieldrin ND 11 EPA 8081B Endrin ND 11 EPA 8081B ,4'-DDD ND 11 EPA 8081B Endosulfan II ND 11 EPA 8081B ,4'-DDT EPA 8081B Endrin Aldehyde ND 11 EPA 8081B Methoxychlor ND 11 EPA 8081B Endosulfan Sulfate ND 11 EPA 8081B Endrin Ketone ND 11 EPA 8081B Toxaphene ND 57 EPA 8081B Surrogate: Percent Recovery Control Limits TCMX DCB

45 11 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: ORGANOCHLORINE PESTICIDES EPA 8081B Matrix: Soil Units: ug/kg (ppb) Date Date Analyte Result PQL Method Prepared Analyzed Flags AV-COMP2 Laboratory ID: alpha-bhc ND 5.8 EPA 8081B gamma-bhc ND 5.8 EPA 8081B beta-bhc ND 5.8 EPA 8081B delta-bhc ND 5.8 EPA 8081B Heptachlor ND 5.8 EPA 8081B Aldrin ND 5.8 EPA 8081B Heptachlor Epoxide ND 5.8 EPA 8081B gamma-chlordane ND 12 EPA 8081B alpha-chlordane ND 12 EPA 8081B ,4'-DDE ND 12 EPA 8081B Endosulfan I ND 5.8 EPA 8081B Dieldrin ND 12 EPA 8081B Endrin ND 12 EPA 8081B ,4'-DDD ND 12 EPA 8081B Endosulfan II ND 12 EPA 8081B ,4'-DDT EPA 8081B Endrin Aldehyde ND 12 EPA 8081B Methoxychlor ND 12 EPA 8081B Endosulfan Sulfate ND 12 EPA 8081B Endrin Ketone ND 12 EPA 8081B Toxaphene ND 58 EPA 8081B Surrogate: Percent Recovery Control Limits TCMX DCB

46 12 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: ORGANOCHLORINE PESTICIDES EPA 8081B Matrix: Soil Units: ug/kg (ppb) Date Date Analyte Result PQL Method Prepared Analyzed Flags AV-COMP3 Laboratory ID: alpha-bhc ND 5.7 EPA 8081B gamma-bhc ND 5.7 EPA 8081B beta-bhc ND 5.7 EPA 8081B delta-bhc ND 5.7 EPA 8081B Heptachlor ND 5.7 EPA 8081B Aldrin ND 5.7 EPA 8081B Heptachlor Epoxide ND 5.7 EPA 8081B gamma-chlordane ND 11 EPA 8081B alpha-chlordane ND 11 EPA 8081B ,4'-DDE ND 11 EPA 8081B Endosulfan I ND 5.7 EPA 8081B Dieldrin ND 11 EPA 8081B Endrin ND 11 EPA 8081B ,4'-DDD ND 11 EPA 8081B Endosulfan II ND 11 EPA 8081B ,4'-DDT EPA 8081B Endrin Aldehyde ND 11 EPA 8081B Methoxychlor ND 11 EPA 8081B Endosulfan Sulfate ND 11 EPA 8081B Endrin Ketone ND 11 EPA 8081B Toxaphene ND 57 EPA 8081B Surrogate: Percent Recovery Control Limits TCMX DCB

47 13 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: ORGANOCHLORINE PESTICIDES EPA 8081B Matrix: Soil Units: ug/kg (ppb) Date Date Analyte Result PQL Method Prepared Analyzed Flags AV-COMP4 Laboratory ID: alpha-bhc ND 5.5 EPA 8081B gamma-bhc ND 5.5 EPA 8081B beta-bhc ND 5.5 EPA 8081B delta-bhc ND 5.5 EPA 8081B Heptachlor ND 5.5 EPA 8081B Aldrin ND 5.5 EPA 8081B Heptachlor Epoxide ND 5.5 EPA 8081B gamma-chlordane ND 11 EPA 8081B alpha-chlordane ND 11 EPA 8081B ,4'-DDE ND 11 EPA 8081B Endosulfan I ND 5.5 EPA 8081B Dieldrin ND 11 EPA 8081B Endrin ND 11 EPA 8081B ,4'-DDD ND 11 EPA 8081B Endosulfan II ND 11 EPA 8081B ,4'-DDT EPA 8081B Endrin Aldehyde ND 11 EPA 8081B Methoxychlor ND 11 EPA 8081B Endosulfan Sulfate ND 11 EPA 8081B Endrin Ketone ND 11 EPA 8081B Toxaphene ND 55 EPA 8081B Surrogate: Percent Recovery Control Limits TCMX DCB

48 14 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: ORGANOCHLORINE PESTICIDES EPA 8081B Matrix: Soil Units: ug/kg (ppb) Date Date Analyte Result PQL Method Prepared Analyzed Flags AV-COMP5 Laboratory ID: alpha-bhc ND 5.9 EPA 8081B gamma-bhc ND 5.9 EPA 8081B beta-bhc ND 5.9 EPA 8081B delta-bhc ND 5.9 EPA 8081B Heptachlor ND 5.9 EPA 8081B Aldrin ND 5.9 EPA 8081B Heptachlor Epoxide ND 5.9 EPA 8081B gamma-chlordane ND 12 EPA 8081B alpha-chlordane ND 12 EPA 8081B ,4'-DDE ND 12 EPA 8081B Endosulfan I ND 5.9 EPA 8081B Dieldrin ND 12 EPA 8081B Endrin ND 12 EPA 8081B ,4'-DDD EPA 8081B Endosulfan II ND 12 EPA 8081B ,4'-DDT EPA 8081B Endrin Aldehyde ND 12 EPA 8081B Methoxychlor ND 12 EPA 8081B Endosulfan Sulfate ND 12 EPA 8081B Endrin Ketone EPA 8081B Toxaphene ND 59 EPA 8081B Surrogate: Percent Recovery Control Limits TCMX DCB

49 15 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: ORGANOCHLORINE PESTICIDES EPA 8081B Matrix: Soil Units: ug/kg (ppb) Date Date Analyte Result PQL Method Prepared Analyzed Flags AV-COMP6 Laboratory ID: alpha-bhc ND 5.8 EPA 8081B gamma-bhc ND 5.8 EPA 8081B beta-bhc ND 5.8 EPA 8081B delta-bhc ND 5.8 EPA 8081B Heptachlor ND 5.8 EPA 8081B Aldrin ND 5.8 EPA 8081B Heptachlor Epoxide ND 5.8 EPA 8081B gamma-chlordane ND 12 EPA 8081B alpha-chlordane ND 12 EPA 8081B ,4'-DDE ND 12 EPA 8081B Endosulfan I ND 5.8 EPA 8081B Dieldrin ND 12 EPA 8081B Endrin ND 12 EPA 8081B ,4'-DDD ND 12 EPA 8081B Endosulfan II ND 12 EPA 8081B ,4'-DDT EPA 8081B Endrin Aldehyde ND 12 EPA 8081B Methoxychlor ND 12 EPA 8081B Endosulfan Sulfate ND 12 EPA 8081B Endrin Ketone ND 12 EPA 8081B Toxaphene ND 58 EPA 8081B Surrogate: Percent Recovery Control Limits TCMX DCB

50 16 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: ORGANOCHLORINE PESTICIDES EPA 8081B Matrix: Soil Units: ug/kg (ppb) Date Date Analyte Result PQL Method Prepared Analyzed Flags AV-COMP7 Laboratory ID: alpha-bhc ND 5.7 EPA 8081B gamma-bhc ND 5.7 EPA 8081B beta-bhc ND 5.7 EPA 8081B delta-bhc ND 5.7 EPA 8081B Heptachlor ND 5.7 EPA 8081B Aldrin ND 5.7 EPA 8081B Heptachlor Epoxide ND 5.7 EPA 8081B gamma-chlordane ND 11 EPA 8081B alpha-chlordane ND 11 EPA 8081B ,4'-DDE EPA 8081B Endosulfan I ND 5.7 EPA 8081B Dieldrin ND 11 EPA 8081B Endrin ND 11 EPA 8081B ,4'-DDD EPA 8081B Endosulfan II ND 11 EPA 8081B ,4'-DDT EPA 8081B Endrin Aldehyde ND 11 EPA 8081B Methoxychlor ND 11 EPA 8081B Endosulfan Sulfate ND 11 EPA 8081B Endrin Ketone ND 11 EPA 8081B Toxaphene ND 57 EPA 8081B Surrogate: Percent Recovery Control Limits TCMX DCB

51 17 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: ORGANOCHLORINE PESTICIDES EPA 8081B QUALITY CONTROL Matrix: Soil Units: ug/kg (ppb) Date Date Analyte Result PQL Method Prepared Analyzed Flags METHOD BLANK Laboratory ID: MB0313S1 alpha-bhc ND 5.0 EPA 8081B gamma-bhc ND 5.0 EPA 8081B beta-bhc ND 5.0 EPA 8081B delta-bhc ND 5.0 EPA 8081B Heptachlor ND 5.0 EPA 8081B Aldrin ND 5.0 EPA 8081B Heptachlor Epoxide ND 5.0 EPA 8081B gamma-chlordane ND 10 EPA 8081B alpha-chlordane ND 10 EPA 8081B ,4'-DDE ND 10 EPA 8081B Endosulfan I ND 5.0 EPA 8081B Dieldrin ND 10 EPA 8081B Endrin ND 10 EPA 8081B ,4'-DDD ND 10 EPA 8081B Endosulfan II ND 10 EPA 8081B ,4'-DDT ND 10 EPA 8081B Endrin Aldehyde ND 10 EPA 8081B Methoxychlor ND 10 EPA 8081B Endosulfan Sulfate ND 10 EPA 8081B Endrin Ketone ND 10 EPA 8081B Toxaphene ND 50 EPA 8081B Surrogate: Percent Recovery Control Limits TCMX DCB Source Percent Recovery RPD Analyte Result Spike Level Result Recovery Limits RPD Limit Flags MATRIX SPIKES Laboratory ID: MS MSD MS MSD MS MSD gamma-bhc ND Heptachlor ND Aldrin ND Dieldrin ND Endrin ND ,4'-DDT ND Surrogate: TCMX DCB

52 18 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: ORGANOCHLORINE PESTICIDES EPA 8081B SPIKE BLANK QUALITY CONTROL Matrix: Soil Units: ug/kg (ppb) Source Percent Recovery Analyte Result Spike Level Result Recovery Limits Flags SPIKE BLANK Laboratory ID: SB0313S1 gamma-bhc N/A Heptachlor N/A Aldrin N/A Dieldrin N/A Endrin N/A ,4'-DDT N/A Surrogate: TCMX DCB

53 19 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: CHLORINATED ACID HERBICIDES EPA 8151A Matrix: Soil Units: ug/kg (ppb) Date Date Analyte Result PQL Method Prepared Analyzed Flags AV-COMP1 Laboratory ID: Dalapon ND 260 EPA 8151A Dicamba ND 11 EPA 8151A MCPP ND 3000 EPA 8151A MCPA ND 1100 EPA 8151A Dichlorprop ND 81 EPA 8151A ,4-D ND 11 EPA 8151A Pentachlorophenol ND 5.5 EPA 8151A ,4,5-TP (Silvex) ND 11 EPA 8151A ,4,5-T ND 11 EPA 8151A ,4-DB ND 11 EPA 8151A Dinoseb ND 11 EPA 8151A Surrogate: Percent Recovery Control Limits DCAA AV-COMP2 Laboratory ID: Dalapon ND 270 EPA 8151A Dicamba ND 11 EPA 8151A MCPP ND 3000 EPA 8151A MCPA ND 1100 EPA 8151A Dichlorprop ND 82 EPA 8151A ,4-D ND 11 EPA 8151A Pentachlorophenol ND 5.5 EPA 8151A ,4,5-TP (Silvex) ND 11 EPA 8151A ,4,5-T ND 11 EPA 8151A ,4-DB ND 11 EPA 8151A Dinoseb ND 11 EPA 8151A Surrogate: Percent Recovery Control Limits DCAA

54 20 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: CHLORINATED ACID HERBICIDES EPA 8151A Matrix: Soil Units: ug/kg (ppb) Date Date Analyte Result PQL Method Prepared Analyzed Flags AV-COMP3 Laboratory ID: Dalapon ND 260 EPA 8151A Dicamba ND 11 EPA 8151A MCPP ND 3000 EPA 8151A MCPA ND 1100 EPA 8151A Dichlorprop ND 81 EPA 8151A ,4-D ND 11 EPA 8151A Pentachlorophenol EPA 8151A ,4,5-TP (Silvex) ND 11 EPA 8151A ,4,5-T ND 11 EPA 8151A ,4-DB ND 11 EPA 8151A Dinoseb ND 11 EPA 8151A Surrogate: Percent Recovery Control Limits DCAA AV-COMP4 Laboratory ID: Dalapon ND 250 EPA 8151A Dicamba ND 10 EPA 8151A MCPP ND 3000 EPA 8151A MCPA ND 1000 EPA 8151A Dichlorprop ND 77 EPA 8151A ,4-D ND 10 EPA 8151A Pentachlorophenol EPA 8151A ,4,5-TP (Silvex) ND 10 EPA 8151A ,4,5-T ND 10 EPA 8151A ,4-DB ND 10 EPA 8151A Dinoseb ND 10 EPA 8151A Surrogate: Percent Recovery Control Limits DCAA

55 21 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: CHLORINATED ACID HERBICIDES EPA 8151A Matrix: Soil Units: ug/kg (ppb) Date Date Analyte Result PQL Method Prepared Analyzed Flags AV-COMP5 Laboratory ID: Dalapon ND 270 EPA 8151A Dicamba ND 11 EPA 8151A MCPP ND 3000 EPA 8151A MCPA ND 1100 EPA 8151A Dichlorprop ND 84 EPA 8151A ,4-D ND 11 EPA 8151A Pentachlorophenol EPA 8151A ,4,5-TP (Silvex) ND 11 EPA 8151A ,4,5-T ND 11 EPA 8151A ,4-DB ND 11 EPA 8151A Dinoseb ND 11 EPA 8151A Surrogate: Percent Recovery Control Limits DCAA AV-COMP6 Laboratory ID: Dalapon ND 260 EPA 8151A Dicamba ND 11 EPA 8151A MCPP ND 3000 EPA 8151A MCPA ND 1100 EPA 8151A Dichlorprop ND 82 EPA 8151A ,4-D ND 11 EPA 8151A Pentachlorophenol ND 5.5 EPA 8151A ,4,5-TP (Silvex) ND 11 EPA 8151A ,4,5-T ND 11 EPA 8151A ,4-DB ND 11 EPA 8151A Dinoseb ND 11 EPA 8151A Surrogate: Percent Recovery Control Limits DCAA

56 22 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: CHLORINATED ACID HERBICIDES EPA 8151A Matrix: Soil Units: ug/kg (ppb) Date Date Analyte Result PQL Method Prepared Analyzed Flags AV-COMP7 Laboratory ID: Dalapon ND 260 EPA 8151A Dicamba ND 11 EPA 8151A MCPP ND 3000 EPA 8151A MCPA ND 1100 EPA 8151A Dichlorprop ND 81 EPA 8151A ,4-D ND 11 EPA 8151A Pentachlorophenol ND 5.4 EPA 8151A ,4,5-TP (Silvex) ND 11 EPA 8151A ,4,5-T ND 11 EPA 8151A ,4-DB ND 11 EPA 8151A Dinoseb ND 11 EPA 8151A Surrogate: Percent Recovery Control Limits DCAA

57 23 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: CHLORINATED ACID HERBICIDES EPA 8151A QUALITY CONTROL Matrix: Soil Units: ug/kg (ppb) Date Date Analyte Result PQL Method Prepared Analyzed Flags METHOD BLANK Laboratory ID: MB0316S1 Dalapon ND 230 EPA 8151A Dicamba ND 9.4 EPA 8151A MCPP ND 2800 EPA 8151A MCPA ND 940 EPA 8151A Dichlorprop ND 71 EPA 8151A ,4-D ND 9.4 EPA 8151A Pentachlorophenol ND 4.8 EPA 8151A ,4,5-TP (Silvex) ND 9.5 EPA 8151A ,4,5-T ND 9.5 EPA 8151A ,4-DB ND 9.5 EPA 8151A Dinoseb ND 9.5 EPA 8151A Surrogate: Percent Recovery Control Limits DCAA Source Percent Recovery RPD Analyte Result Spike Level Result Recovery Limits RPD Limit Flags SPIKE BLANKS Laboratory ID: SB0316S1 SB SBD SB SBD SB SBD Dicamba N/A ,4-D N/A Pentachlorophenol N/A ,4,5-T N/A ,4-DB N/A Surrogate: DCAA

58 24 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: TOTAL METALS EPA 6010C/7471B Matrix: Units: Concrete mg/kg (ppm) Date Date Analyte Result PQL EPA Method Prepared Analyzed Flags Lab ID: AV-CONC-1 Arsenic C Cadmium C Chromium C Lead C Mercury ND B Lab ID: AV-CONC-2 Arsenic C Cadmium C Chromium C Lead C Mercury ND B Lab ID: AV-CONC-3 Arsenic ND C Cadmium ND C Chromium C Lead C Mercury ND B

59 25 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: TOTAL METALS EPA 6010C/7471B Matrix: Units: Concrete mg/kg (ppm) Date Date Analyte Result PQL EPA Method Prepared Analyzed Flags Lab ID: AV-CONC-4 Arsenic ND C Cadmium C Chromium C Lead ND C Mercury ND B

60 26 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: TOTAL METALS EPA 6010C/7471B Matrix: Units: Soil mg/kg (ppm) Date Date Analyte Result PQL EPA Method Prepared Analyzed Flags Lab ID: AV-COMP1 Arsenic ND C Cadmium C Chromium C Lead C Mercury ND B Lab ID: AV-COMP2 Arsenic C Cadmium C Chromium C Lead C Mercury ND B Lab ID: AV-COMP3 Arsenic C Cadmium C Chromium C Lead C Mercury ND B

61 27 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: TOTAL METALS EPA 6010C/7471B Matrix: Units: Soil mg/kg (ppm) Date Date Analyte Result PQL EPA Method Prepared Analyzed Flags Lab ID: AV-COMP4 Arsenic ND C Cadmium ND C Chromium C Lead C Mercury ND B Lab ID: AV-COMP5 Arsenic C Cadmium C Chromium C Lead C Mercury ND B Lab ID: AV-COMP6 Arsenic ND C Cadmium C Chromium C Lead C Mercury ND B

62 28 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: TOTAL METALS EPA 6010C/7471B Matrix: Units: Soil mg/kg (ppm) Date Date Analyte Result PQL EPA Method Prepared Analyzed Flags Lab ID: AV-COMP7 Arsenic ND C Cadmium C Chromium C Lead C Mercury B

63 29 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: TOTAL METALS EPA 6010C/7471B METHOD BLANK QUALITY CONTROL Date Extracted: Date Analyzed: 3-12& &16-15 Matrix: Units: Concrete mg/kg (ppm) Lab ID: MB0316SM1&MB0312S1 Analyte Method Result PQL Arsenic 6010C ND 10 Cadmium 6010C ND 0.50 Chromium 6010C ND 0.50 Lead 6010C ND 5.0 Mercury 7471B ND 0.25

64 30 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: TOTAL METALS EPA 6010C/7471B METHOD BLANK QUALITY CONTROL Date Extracted: Date Analyzed: Matrix: Units: Soil mg/kg (ppm) Lab ID: MB0312SM2&MB0312S2 Analyte Method Result PQL Arsenic 6010C ND 10 Cadmium 6010C ND 0.50 Chromium 6010C ND 0.50 Lead 6010C ND 5.0 Mercury 7471B ND 0.25

65 31 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: TOTAL METALS EPA 6010C/7471B DUPLICATE QUALITY CONTROL Date Extracted: Date Analyzed: 3-12& &16-15 Matrix: Units: Concrete mg/kg (ppm) Lab ID: Sample Duplicate Analyte Result Result RPD PQL Flags Arsenic Cadmium Chromium Lead Mercury ND ND NA 0.25

66 32 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: TOTAL METALS EPA 6010C/7471B DUPLICATE QUALITY CONTROL Date Extracted: Date Analyzed: Matrix: Units: Soil mg/kg (ppm) Lab ID: Sample Duplicate Analyte Result Result RPD PQL Flags Arsenic ND ND NA 10 Cadmium ND ND NA 0.50 Chromium Lead Mercury ND ND NA 0.25

67 33 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: TOTAL METALS EPA 6010C/7471B MS/MSD QUALITY CONTROL Date Extracted: Date Analyzed: 3-12& &16-15 Matrix: Units: Concrete mg/kg (ppm) Lab ID: Spike Percent Percent Analyte Level MS Recovery MSD Recovery RPD Flags Arsenic Cadmium Chromium Lead Mercury

68 34 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: TOTAL METALS EPA 6010C/7471B MS/MSD QUALITY CONTROL Date Extracted: Date Analyzed: Matrix: Units: Soil mg/kg (ppm) Lab ID: Spike Percent Percent Analyte Level MS Recovery MSD Recovery RPD Flags Arsenic Cadmium Chromium Lead Mercury

69 35 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: TOTAL METALS EPA 6010C/7471B SPIKE BLANK QUALITY CONTROL Date Extracted: Date Analyzed: 3-12& &16-15 Matrix: Units: Concrete mg/kg (ppm) Lab ID: SB0316SM1&SB0312S1 Spike SB Percent Analyte Method Level Result Recovery Arsenic 6010C Cadmium 6010C Chromium 6010C Lead 6010C Mercury 7471B

70 36 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: TOTAL METALS EPA 6010C/7471B SPIKE BLANK QUALITY CONTROL Date Extracted: Date Analyzed: Matrix: Units: Soil mg/kg (ppm) Lab ID: SB0312SM2&SB0312S2 Spike SB Percent Analyte Method Level Result Recovery Arsenic 6010C Cadmium 6010C Chromium 6010C Lead 6010C Mercury 7471B

71 37 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: % MOISTURE Date Analyzed: Client ID Lab ID % Moisture AV-COMP AV-COMP AV-COMP AV-COMP AV-COMP AV-COMP AV-COMP

72 38 Data Qualifiers and Abbreviations A - Due to a high sample concentration, the amount spiked is insufficient for meaningful MS/MSD recovery data. B - The analyte indicated was also found in the blank sample. C - The duplicate RPD is outside control limits due to high result variability when analyte concentrations are within five times the quantitation limit. E - The value reported exceeds the quantitation range and is an estimate. F - Surrogate recovery data is not available due to the high concentration of coeluting target compounds. H - The analyte indicated is a common laboratory solvent and may have been introduced during sample preparation, and be impacting the sample result. I - Compound recovery is outside of the control limits. J - The value reported was below the practical quantitation limit. The value is an estimate. K - Sample duplicate RPD is outside control limits due to sample inhomogeneity. The sample was re-extracted and re-analyzed with similar results. L - The RPD is outside of the control limits. M - Hydrocarbons in the gasoline range are impacting the diesel range result. M1 - Hydrocarbons in the gasoline range (toluene-napthalene) are present in the sample. N - Hydrocarbons in the lube oil range are impacting the diesel range result. N1 - Hydrocarbons in diesel range are impacting lube oil range results. O - Hydrocarbons indicative of heavier fuels are present in the sample and are impacting the gasoline result. P - The RPD of the detected concentrations between the two columns is greater than 40. Q - Surrogate recovery is outside of the control limits. S - Surrogate recovery data is not available due to the necessary dilution of the sample. T - The sample chromatogram is not similar to a typical. U - The analyte was analyzed for, but was not detected above the reported sample quantitation limit. U1 - The practical quantitation limit is elevated due to interferences present in the sample. V - Matrix Spike/Matrix Spike Duplicate recoveries are outside control limits due to matrix effects. W - Matrix Spike/Matrix Spike Duplicate RPD are outside control limits due to matrix effects. X - Sample extract treated with a mercury cleanup procedure. X1- Sample extract treated with a Sulfuric acid/silica gel cleanup procedure. Y - The calibration verification for this analyte exceeded the 20% drift specified in method 8260C, and therefore the reported result should be considered an estimate. The overall performance of the calibration verification standard met the acceptance criteria of the method. Z - ND - Not Detected at PQL PQL - Practical Quantitation Limit RPD - Relative Percent Difference

73

74

75

76

77 14648 NE 95 th Street, Redmond, WA (425) April 1, 2015 Ross Stainsby Hart Crowser, Inc Westlake Avenue North, Suite 200 Seattle, WA Re: Analytical Data for Project Laboratory Reference No B Dear Ross: Enclosed are the analytical results and associated quality control data for samples submitted on March 5, The standard policy of OnSite Environmental, Inc. is to store your samples for 30 days from the date of receipt. If you require longer storage, please contact the laboratory. We appreciate the opportunity to be of service to you on this project. If you have any questions concerning the data, or need additional information, please feel free to call me. Sincerely, David Baumeister Project Manager Enclosures

78 2 Date of Report: April 1, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: B Case Narrative Samples were collected on March 4, 2015 and received by the laboratory on March 5, They were maintained at the laboratory at a temperature of 2 o C to 6 o C. General QA/QC issues associated with the analytical data enclosed in this laboratory report will be indicated with a reference to a comment or explanation on the Data Qualifier page. More complex and involved QA/QC issues will be discussed in detail below.

79 3 Date of Report: April 1, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: B TOTAL METALS EPA 6010C Matrix: Units: Soil mg/kg (ppm) Date Date Analyte Result PQL EPA Method Prepared Analyzed Flags Lab ID: AV-COMP2-SS1 Cadmium ND C Lead C Lab ID: AV-COMP2-SS2 Cadmium C Lead C Lab ID: AV-COMP2-SS3 Cadmium ND C Lead C Lab ID: AV-COMP2-SS4 Cadmium C Lead C Lab ID: AV-COMP2-SS5 Cadmium C Lead C Lab ID: AV-COMP3-SS1 Lead C

80 4 Date of Report: April 1, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: B TOTAL METALS EPA 6010C Matrix: Units: Soil mg/kg (ppm) Date Date Analyte Result PQL EPA Method Prepared Analyzed Flags Lab ID: AV-COMP3-SS2 Lead C Lab ID: AV-COMP3-SS3 Lead C Lab ID: AV-COMP3-SS4 Lead C Lab ID: AV-COMP5-SS1 Lead C Lab ID: AV-COMP5-SS2 Lead C Lab ID: AV-COMP5-SS3 Lead C

81 5 Date of Report: April 1, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: B TOTAL METALS EPA 6010C/7471B Matrix: Units: Soil mg/kg (ppm) Date Date Analyte Result PQL EPA Method Prepared Analyzed Flags Lab ID: AV-COMP5-SS4 Lead C Lab ID: AV-COMP7-SS1 Lead C Mercury B Lab ID: AV-COMP7-SS2 Lead C Mercury B Lab ID: AV-COMP7-SS3 Lead C Mercury ND B Lab ID: AV-COMP7-SS4 Lead C Mercury ND B

82 6 Date of Report: April 1, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: B TOTAL METALS EPA 6010C/7471B METHOD BLANK QUALITY CONTROL Date Extracted: Date Analyzed: Matrix: Units: Soil mg/kg (ppm) Lab ID: MB0330SM1&MB0330S1 Analyte Method Result PQL Cadmium 6010C ND 0.50 Lead 6010C ND 5.0 Mercury 7471B ND 0.25

83 7 Date of Report: April 1, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: B TOTAL METALS EPA 6010C/7471B DUPLICATE QUALITY CONTROL Date Extracted: Date Analyzed: Matrix: Units: Soil mg/kg (ppm) Lab ID: Sample Duplicate Analyte Result Result RPD PQL Flags Cadmium ND ND NA 0.50 Lead Mercury ND ND NA 0.25

84 8 Date of Report: April 1, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: B TOTAL METALS EPA 6010C/7471B MS/MSD QUALITY CONTROL Date Extracted: Date Analyzed: Matrix: Units: Soil mg/kg (ppm) Lab ID: Spike Percent Percent Analyte Level MS Recovery MSD Recovery RPD Flags Cadmium Lead Mercury

85 9 Date of Report: April 1, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: B TOTAL METALS EPA 6010C/7471B SPIKE BLANK QUALITY CONTROL Date Extracted: Date Analyzed: Matrix: Units: Soil mg/kg (ppm) Lab ID: SB0330SM1&SB0330S1 Spike SB Percent Analyte Method Level Result Recovery Cadmium 6010C Lead 6010C Mercury 7471B

86 10 Date of Report: April 1, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: B TCLP LEAD EPA 1311/6010C Matrix: Units: TCLP Extract mg/l (ppm) Date Date Analyte Result PQL EPA Method Prepared Analyzed Flags Lab ID: AV-COMP5 Lead C

87 11 Date of Report: April 1, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: B TCLP LEAD EPA 1311/6010C METHOD BLANK QUALITY CONTROL Date Prepared: Date Extracted: Date Analyzed: Matrix: Units: TCLP Extract mg/l (ppm) Lab ID: MB0326TM1 Analyte Method Result PQL Lead 6010C ND 0.20

88 12 Date of Report: April 1, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: B TCLP LEAD EPA 1311/6010C DUPLICATE QUALITY CONTROL Date Prepared: Date Extracted: Date Analyzed: Matrix: Units: TCLP Extract mg/l (ppm) Lab ID: Sample Duplicate Analyte Result Result RPD PQL Flags Lead ND ND NA 0.20

89 13 Date of Report: April 1, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: B TCLP LEAD EPA 1311/6010C MS/MSD QUALITY CONTROL Date Prepared: Date Extracted: Date Analyzed: Matrix: Units: TCLP Extract mg/l (ppm) Lab ID: Spike Percent Percent Analyte Level MS Recovery MSD Recovery RPD Flags Lead

90 14 Date of Report: April 1, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: B TCLP LEAD EPA 1311/6010C SPIKE BLANK QUALITY CONTROL Date Prepared: Date Extracted: Date Analyzed: Matrix: Units: TCLP Extract mg/l (ppm) Lab ID: SB0326TM1 Spike Percent Analyte Method Level SB Recovery Lead 6010C

91 15 Date of Report: April 1, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: B PCBs EPA 8082A Matrix: Soil Units: mg/kg (ppm) Date Date Analyte Result PQL Method Prepared Analyzed Flags AV-COMP6-SS1 Laboratory ID: Aroclor 1016 ND EPA 8082A Aroclor 1221 ND EPA 8082A Aroclor 1232 ND EPA 8082A Aroclor 1242 ND EPA 8082A Aroclor 1248 ND EPA 8082A Aroclor 1254 ND EPA 8082A Aroclor 1260 ND EPA 8082A Surrogate: Percent Recovery Control Limits DCB AV-COMP6-SS2 Laboratory ID: Aroclor 1016 ND EPA 8082A Aroclor 1221 ND EPA 8082A Aroclor 1232 ND EPA 8082A Aroclor 1242 ND EPA 8082A Aroclor 1248 ND EPA 8082A Aroclor 1254 ND EPA 8082A Aroclor EPA 8082A Surrogate: Percent Recovery Control Limits DCB AV-COMP6-SS3 Laboratory ID: Aroclor 1016 ND EPA 8082A Aroclor 1221 ND EPA 8082A Aroclor 1232 ND EPA 8082A Aroclor 1242 ND EPA 8082A Aroclor 1248 ND EPA 8082A Aroclor 1254 ND EPA 8082A Aroclor 1260 ND EPA 8082A Surrogate: Percent Recovery Control Limits DCB

92 16 Date of Report: April 1, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: B PCBs EPA 8082A QUALITY CONTROL Matrix: Soil Units: mg/kg (ppm) Date Date Analyte Result PQL Method Prepared Analyzed Flags METHOD BLANK Laboratory ID: MB0325S1 Aroclor 1016 ND EPA 8082A Aroclor 1221 ND EPA 8082A Aroclor 1232 ND EPA 8082A Aroclor 1242 ND EPA 8082A Aroclor 1248 ND EPA 8082A Aroclor 1254 ND EPA 8082A Aroclor 1260 ND EPA 8082A Surrogate: Percent Recovery Control Limits DCB Source Percent Recovery RPD Analyte Result Spike Level Result Recovery Limits RPD Limit Flags MATRIX SPIKES Laboratory ID: MS MSD MS MSD MS MSD Aroclor ND Surrogate: DCB

93 17 Date of Report: April 1, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: B % MOISTURE Date Analyzed: 3-25&30-15 Client ID Lab ID % Moisture AV-COMP2-SS AV-COMP2-SS AV-COMP2-SS AV-COMP2-SS AV-COMP2-SS AV-COMP3-SS AV-COMP3-SS AV-COMP3-SS AV-COMP3-SS AV-COMP5-SS AV-COMP5-SS AV-COMP5-SS AV-COMP5-SS AV-COMP6-SS AV-COMP6-SS AV-COMP6-SS AV-COMP7-SS AV-COMP7-SS AV-COMP7-SS AV-COMP7-SS

94 18 Data Qualifiers and Abbreviations A - Due to a high sample concentration, the amount spiked is insufficient for meaningful MS/MSD recovery data. B - The analyte indicated was also found in the blank sample. C - The duplicate RPD is outside control limits due to high result variability when analyte concentrations are within five times the quantitation limit. E - The value reported exceeds the quantitation range and is an estimate. F - Surrogate recovery data is not available due to the high concentration of coeluting target compounds. H - The analyte indicated is a common laboratory solvent and may have been introduced during sample preparation, and be impacting the sample result. I - Compound recovery is outside of the control limits. J - The value reported was below the practical quantitation limit. The value is an estimate. K - Sample duplicate RPD is outside control limits due to sample inhomogeneity. The sample was re-extracted and re-analyzed with similar results. L - The RPD is outside of the control limits. M - Hydrocarbons in the gasoline range are impacting the diesel range result. M1 - Hydrocarbons in the gasoline range (toluene-napthalene) are present in the sample. N - Hydrocarbons in the lube oil range are impacting the diesel range result. N1 - Hydrocarbons in diesel range are impacting lube oil range results. O - Hydrocarbons indicative of heavier fuels are present in the sample and are impacting the gasoline result. P - The RPD of the detected concentrations between the two columns is greater than 40. Q - Surrogate recovery is outside of the control limits. S - Surrogate recovery data is not available due to the necessary dilution of the sample. T - The sample chromatogram is not similar to a typical. U - The analyte was analyzed for, but was not detected above the reported sample quantitation limit. U1 - The practical quantitation limit is elevated due to interferences present in the sample. V - Matrix Spike/Matrix Spike Duplicate recoveries are outside control limits due to matrix effects. W - Matrix Spike/Matrix Spike Duplicate RPD are outside control limits due to matrix effects. X - Sample extract treated with a mercury cleanup procedure. X1- Sample extract treated with a Sulfuric acid/silica gel cleanup procedure. Y - The calibration verification for this analyte exceeded the 20% drift specified in method 8260C, and therefore the reported result should be considered an estimate. The overall performance of the calibration verification standard met the acceptance criteria of the method. Z - ND - Not Detected at PQL PQL - Practical Quantitation Limit RPD - Relative Percent Difference

95

96

97

98

99 14648 NE 95 th Street, Redmond, WA (425) April 14, 2015 Ross Stainsby Hart Crowser, Inc Westlake Avenue North, Suite 200 Seattle, WA Re: Analytical Data for Project Laboratory Reference No C Dear Ross: Enclosed are the analytical results and associated quality control data for samples submitted on March 5, The standard policy of OnSite Environmental, Inc. is to store your samples for 30 days from the date of receipt. If you require longer storage, please contact the laboratory. We appreciate the opportunity to be of service to you on this project. If you have any questions concerning the data, or need additional information, please feel free to call me. Sincerely, David Baumeister Project Manager Enclosures

100 2 Date of Report: April 14, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: C Case Narrative Samples were collected on March 4, 2015 and received by the laboratory on March 5, They were maintained at the laboratory at a temperature of 2 o C to 6 o C. Please note that all soil sample results are reported on a dry-weight basis, unless otherwise noted below. General QA/QC issues associated with the analytical data enclosed in this laboratory report will be indicated with a reference to a comment or explanation on the Data Qualifier page. More complex and involved QA/QC issues will be discussed in detail below.

101 3 Date of Report: April 14, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: C TCLP LEAD EPA 1311/6010C Matrix: Units: TCLP Extract mg/l (ppm) Date Date Analyte Result PQL EPA Method Prepared Analyzed Flags Lab ID: AV-COMP2-SS4 Lead C Lab ID: AV-COMP5-SS2 Lead C

102 4 Date of Report: April 14, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: C TCLP LEAD EPA 1311/6010C METHOD BLANK QUALITY CONTROL Date Prepared: Date Extracted: Date Analyzed: Matrix: Units: TCLP Extract mg/l (ppm) Lab ID: MB0410TM1 Analyte Method Result PQL Lead 6010C ND 0.20

103 5 Date of Report: April 14, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: C TCLP LEAD EPA 1311/6010C DUPLICATE QUALITY CONTROL Date Prepared: Date Extracted: Date Analyzed: Matrix: Units: TCLP Extract mg/l (ppm) Lab ID: Sample Duplicate Analyte Result Result RPD PQL Flags Lead ND NA 0.20

104 6 Date of Report: April 14, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: C TCLP LEAD EPA 1311/6010C MS/MSD QUALITY CONTROL Date Prepared: Date Extracted: Date Analyzed: Matrix: Units: TCLP Extract mg/l (ppm) Lab ID: Spike Percent Percent Analyte Level MS Recovery MSD Recovery RPD Flags Lead

105 7 Date of Report: April 14, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: C TCLP LEAD EPA 1311/6010C SPIKE BLANK QUALITY CONTROL Date Prepared: Date Extracted: Date Analyzed: Matrix: Units: TCLP Extract mg/l (ppm) Lab ID: Spike Percent Analyte Method Level SB Recovery Lead 6010C

106 8 Data Qualifiers and Abbreviations A - Due to a high sample concentration, the amount spiked is insufficient for meaningful MS/MSD recovery data. B - The analyte indicated was also found in the blank sample. C - The duplicate RPD is outside control limits due to high result variability when analyte concentrations are within five times the quantitation limit. E - The value reported exceeds the quantitation range and is an estimate. F - Surrogate recovery data is not available due to the high concentration of coeluting target compounds. H - The analyte indicated is a common laboratory solvent and may have been introduced during sample preparation, and be impacting the sample result. I - Compound recovery is outside of the control limits. J - The value reported was below the practical quantitation limit. The value is an estimate. K - Sample duplicate RPD is outside control limits due to sample inhomogeneity. The sample was re-extracted and re-analyzed with similar results. L - The RPD is outside of the control limits. M - Hydrocarbons in the gasoline range are impacting the diesel range result. M1 - Hydrocarbons in the gasoline range (toluene-napthalene) are present in the sample. N - Hydrocarbons in the lube oil range are impacting the diesel range result. N1 - Hydrocarbons in diesel range are impacting lube oil range results. O - Hydrocarbons indicative of heavier fuels are present in the sample and are impacting the gasoline result. P - The RPD of the detected concentrations between the two columns is greater than 40. Q - Surrogate recovery is outside of the control limits. S - Surrogate recovery data is not available due to the necessary dilution of the sample. T - The sample chromatogram is not similar to a typical. U - The analyte was analyzed for, but was not detected above the reported sample quantitation limit. U1 - The practical quantitation limit is elevated due to interferences present in the sample. V - Matrix Spike/Matrix Spike Duplicate recoveries are outside control limits due to matrix effects. W - Matrix Spike/Matrix Spike Duplicate RPD are outside control limits due to matrix effects. X - Sample extract treated with a mercury cleanup procedure. X1- Sample extract treated with a Sulfuric acid/silica gel cleanup procedure. Y - The calibration verification for this analyte exceeded the 20% drift specified in method 8260C, and therefore the reported result should be considered an estimate. The overall performance of the calibration verification standard met the acceptance criteria of the method. Z - ND - Not Detected at PQL PQL - Practical Quantitation Limit RPD - Relative Percent Difference

107

108

109

110

111 14648 NE 95 th Street, Redmond, WA (425) March 20, 2015 Ross Stainsby Hart Crowser, Inc Westlake Avenue North, Suite 200 Seattle, WA Re: Analytical Data for Project Laboratory Reference No Dear Ross: Enclosed are the analytical results and associated quality control data for samples submitted on March 5, The standard policy of OnSite Environmental, Inc. is to store your samples for 30 days from the date of receipt. If you require longer storage, please contact the laboratory. We appreciate the opportunity to be of service to you on this project. If you have any questions concerning the data, or need additional information, please feel free to call me. Sincerely, David Baumeister Project Manager Enclosures

112 2 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: Case Narrative Samples were collected on March 5, 2015 and received by the laboratory on March 5, They were maintained at the laboratory at a temperature of 2 o C to 6 o C. General QA/QC issues associated with the analytical data enclosed in this laboratory report will be indicated with a reference to a comment or explanation on the Data Qualifier page. More complex and involved QA/QC issues will be discussed in detail below. Organochlorine Pesticides by EPA 8081B Analysis Due to negative effects of the matrix from samples AV-COMP8 and AV-COMP11 on the instrument, values for 4,4 - DDT, Endrin Aldehyde, and Methoxychlor in the continuing calibration verification standards (CCVs) were low. Samples AV-COMP13 and AV-COMP14 caused gamma-chlordane, 4 -DDT, Endrin Aldehyde, and Methoxychlor to be low in their closing CCV. Since the degradation of the CCV standards was reproducible after re-injecting the sample extracts, the CCV degradation problem was attributed to the matrix of these samples. Any other QA/QC issues associated with this extraction and analysis will be indicated with a footnote reference and discussed in detail on the Data Qualifier page.

113 3 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: NWTPH-Dx Matrix: Soil Units: mg/kg (ppm) Date Date Analyte Result PQL Method Prepared Analyzed Flags AV-COMP8 Laboratory ID: Diesel Range Organics NWTPH-Dx N Lube Oil NWTPH-Dx Surrogate: Percent Recovery Control Limits o-terphenyl AV-COMP12 Laboratory ID: Diesel Range Organics NWTPH-Dx Lube Oil NWTPH-Dx Surrogate: Percent Recovery Control Limits o-terphenyl AV-COMP13 Laboratory ID: Diesel Range Organics NWTPH-Dx Lube Oil NWTPH-Dx Surrogate: Percent Recovery Control Limits o-terphenyl

114 4 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: NWTPH-Dx QUALITY CONTROL Matrix: Soil Units: mg/kg (ppm) Date Date Analyte Result PQL Method Prepared Analyzed Flags METHOD BLANK Laboratory ID: MB0310S1 Diesel Range Organics ND 25 NWTPH-Dx Lube Oil Range Organics ND 50 NWTPH-Dx Surrogate: Percent Recovery Control Limits o-terphenyl Source Percent Recovery RPD Analyte Result Spike Level Result Recovery Limits RPD Limit Flags DUPLICATE Laboratory ID: ORIG DUP Diesel Range ND ND NA NA NA NA NA NA Lube Oil NA NA NA NA 28 NA Surrogate: o-terphenyl SPIKE BLANK Laboratory ID: SB0310S1 Diesel Fuel # NA NA NA Surrogate: o-terphenyl

115 5 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: ORGANOCHLORINE PESTICIDES EPA 8081B Matrix: Soil Units: ug/kg (ppb) Date Date Analyte Result PQL Method Prepared Analyzed Flags AV-COMP8 Laboratory ID: alpha-bhc ND 6.2 EPA 8081B gamma-bhc ND 6.2 EPA 8081B beta-bhc ND 6.2 EPA 8081B delta-bhc ND 6.2 EPA 8081B Heptachlor ND 6.2 EPA 8081B Aldrin ND 6.2 EPA 8081B Heptachlor Epoxide ND 6.2 EPA 8081B gamma-chlordane ND 12 EPA 8081B alpha-chlordane ND 12 EPA 8081B ,4'-DDE ND 12 EPA 8081B Endosulfan I ND 6.2 EPA 8081B Dieldrin EPA 8081B Endrin ND 12 EPA 8081B ,4'-DDD ND 12 EPA 8081B Endosulfan II ND 12 EPA 8081B ,4'-DDT EPA 8081B Endrin Aldehyde ND 12 EPA 8081B Methoxychlor ND 12 EPA 8081B Endosulfan Sulfate ND 12 EPA 8081B Endrin Ketone ND 12 EPA 8081B Toxaphene ND 62 EPA 8081B Surrogate: Percent Recovery Control Limits TCMX DCB

116 6 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: ORGANOCHLORINE PESTICIDES EPA 8081B Matrix: Soil Units: ug/kg (ppb) Date Date Analyte Result PQL Method Prepared Analyzed Flags AV-COMP9 Laboratory ID: alpha-bhc ND 6.7 EPA 8081B gamma-bhc ND 6.7 EPA 8081B beta-bhc ND 6.7 EPA 8081B delta-bhc ND 6.7 EPA 8081B Heptachlor ND 6.7 EPA 8081B Aldrin ND 6.7 EPA 8081B Heptachlor Epoxide ND 6.7 EPA 8081B gamma-chlordane ND 13 EPA 8081B alpha-chlordane ND 13 EPA 8081B ,4'-DDE EPA 8081B Endosulfan I ND 6.7 EPA 8081B Dieldrin EPA 8081B Endrin ND 13 EPA 8081B ,4'-DDD ND 13 EPA 8081B Endosulfan II ND 13 EPA 8081B ,4'-DDT EPA 8081B Endrin Aldehyde ND 13 EPA 8081B Methoxychlor ND 13 EPA 8081B Endosulfan Sulfate ND 13 EPA 8081B Endrin Ketone ND 13 EPA 8081B Toxaphene ND 67 EPA 8081B Surrogate: Percent Recovery Control Limits TCMX DCB

117 7 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: ORGANOCHLORINE PESTICIDES EPA 8081B Matrix: Soil Units: ug/kg (ppb) Date Date Analyte Result PQL Method Prepared Analyzed Flags AV-COMP10 Laboratory ID: alpha-bhc ND 6.5 EPA 8081B gamma-bhc ND 6.5 EPA 8081B beta-bhc ND 6.5 EPA 8081B delta-bhc ND 6.5 EPA 8081B Heptachlor ND 6.5 EPA 8081B Aldrin ND 6.5 EPA 8081B Heptachlor Epoxide ND 6.5 EPA 8081B gamma-chlordane ND 13 EPA 8081B alpha-chlordane ND 13 EPA 8081B ,4'-DDE EPA 8081B Endosulfan I ND 6.5 EPA 8081B Dieldrin EPA 8081B Endrin ND 13 EPA 8081B ,4'-DDD ND 13 EPA 8081B Endosulfan II ND 13 EPA 8081B ,4'-DDT EPA 8081B Endrin Aldehyde ND 13 EPA 8081B Methoxychlor ND 13 EPA 8081B Endosulfan Sulfate ND 13 EPA 8081B Endrin Ketone ND 13 EPA 8081B Toxaphene ND 65 EPA 8081B Surrogate: Percent Recovery Control Limits TCMX DCB

118 8 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: ORGANOCHLORINE PESTICIDES EPA 8081B Matrix: Soil Units: ug/kg (ppb) Date Date Analyte Result PQL Method Prepared Analyzed Flags AV-COMP11 Laboratory ID: alpha-bhc ND 7.3 EPA 8081B gamma-bhc ND 7.3 EPA 8081B beta-bhc ND 7.3 EPA 8081B delta-bhc ND 7.3 EPA 8081B Heptachlor ND 7.3 EPA 8081B Aldrin ND 7.3 EPA 8081B Heptachlor Epoxide ND 7.3 EPA 8081B gamma-chlordane ND 15 EPA 8081B alpha-chlordane ND 15 EPA 8081B ,4'-DDE EPA 8081B Endosulfan I ND 7.3 EPA 8081B Dieldrin EPA 8081B Endrin ND 15 EPA 8081B ,4'-DDD EPA 8081B Endosulfan II ND 15 EPA 8081B ,4'-DDT EPA 8081B Endrin Aldehyde ND 15 EPA 8081B Methoxychlor ND 15 EPA 8081B Endosulfan Sulfate ND 15 EPA 8081B Endrin Ketone ND 15 EPA 8081B Toxaphene ND 73 EPA 8081B Surrogate: Percent Recovery Control Limits TCMX DCB

119 9 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: ORGANOCHLORINE PESTICIDES EPA 8081B Matrix: Soil Units: ug/kg (ppb) Date Date Analyte Result PQL Method Prepared Analyzed Flags AV-COMP12 Laboratory ID: alpha-bhc ND 6.1 EPA 8081B gamma-bhc ND 6.1 EPA 8081B beta-bhc ND 6.1 EPA 8081B delta-bhc ND 6.1 EPA 8081B Heptachlor ND 6.1 EPA 8081B Aldrin ND 6.1 EPA 8081B Heptachlor Epoxide ND 6.1 EPA 8081B gamma-chlordane ND 12 EPA 8081B alpha-chlordane ND 12 EPA 8081B ,4'-DDE ND 12 EPA 8081B Endosulfan I ND 6.1 EPA 8081B Dieldrin ND 12 EPA 8081B Endrin ND 12 EPA 8081B ,4'-DDD ND 12 EPA 8081B Endosulfan II ND 12 EPA 8081B ,4'-DDT ND 12 EPA 8081B Endrin Aldehyde ND 12 EPA 8081B Methoxychlor ND 12 EPA 8081B Endosulfan Sulfate ND 12 EPA 8081B Endrin Ketone ND 12 EPA 8081B Toxaphene ND 61 EPA 8081B Surrogate: Percent Recovery Control Limits TCMX DCB

120 10 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: ORGANOCHLORINE PESTICIDES EPA 8081B Matrix: Soil Units: ug/kg (ppb) Date Date Analyte Result PQL Method Prepared Analyzed Flags AV-COMP13 Laboratory ID: alpha-bhc ND 6.3 EPA 8081B gamma-bhc ND 6.3 EPA 8081B beta-bhc ND 6.3 EPA 8081B delta-bhc ND 6.3 EPA 8081B Heptachlor ND 6.3 EPA 8081B Aldrin ND 6.3 EPA 8081B Heptachlor Epoxide ND 6.3 EPA 8081B gamma-chlordane ND 13 EPA 8081B alpha-chlordane ND 13 EPA 8081B ,4'-DDE ND 13 EPA 8081B Endosulfan I ND 6.3 EPA 8081B Dieldrin ND 13 EPA 8081B Endrin ND 13 EPA 8081B ,4'-DDD ND 13 EPA 8081B Endosulfan II ND 13 EPA 8081B ,4'-DDT ND 13 EPA 8081B Endrin Aldehyde ND 13 EPA 8081B Methoxychlor ND 13 EPA 8081B Endosulfan Sulfate ND 13 EPA 8081B Endrin Ketone ND 13 EPA 8081B Toxaphene ND 63 EPA 8081B Surrogate: Percent Recovery Control Limits TCMX DCB

121 11 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: ORGANOCHLORINE PESTICIDES EPA 8081B Matrix: Soil Units: ug/kg (ppb) Date Date Analyte Result PQL Method Prepared Analyzed Flags AV-COMP14 Laboratory ID: alpha-bhc ND 6.7 EPA 8081B gamma-bhc ND 6.7 EPA 8081B beta-bhc ND 6.7 EPA 8081B delta-bhc ND 6.7 EPA 8081B Heptachlor ND 6.7 EPA 8081B Aldrin ND 6.7 EPA 8081B Heptachlor Epoxide ND 6.7 EPA 8081B gamma-chlordane ND 13 EPA 8081B alpha-chlordane ND 13 EPA 8081B ,4'-DDE ND 13 EPA 8081B Endosulfan I ND 6.7 EPA 8081B Dieldrin ND 13 EPA 8081B Endrin ND 13 EPA 8081B ,4'-DDD ND 13 EPA 8081B Endosulfan II ND 13 EPA 8081B ,4'-DDT ND 13 EPA 8081B Endrin Aldehyde ND 13 EPA 8081B Methoxychlor ND 13 EPA 8081B Endosulfan Sulfate ND 13 EPA 8081B Endrin Ketone ND 13 EPA 8081B Toxaphene ND 67 EPA 8081B Surrogate: Percent Recovery Control Limits TCMX DCB

122 12 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: ORGANOCHLORINE PESTICIDES EPA 8081B QUALITY CONTROL Matrix: Soil Units: ug/kg (ppb) Date Date Analyte Result PQL Method Prepared Analyzed Flags METHOD BLANK Laboratory ID: MB0312S2 alpha-bhc ND 5.0 EPA 8081B gamma-bhc ND 5.0 EPA 8081B beta-bhc ND 5.0 EPA 8081B delta-bhc ND 5.0 EPA 8081B Heptachlor ND 5.0 EPA 8081B Aldrin ND 5.0 EPA 8081B Heptachlor Epoxide ND 5.0 EPA 8081B gamma-chlordane ND 10 EPA 8081B alpha-chlordane ND 10 EPA 8081B ,4'-DDE ND 10 EPA 8081B Endosulfan I ND 5.0 EPA 8081B Dieldrin ND 10 EPA 8081B Endrin ND 10 EPA 8081B ,4'-DDD ND 10 EPA 8081B Endosulfan II ND 10 EPA 8081B ,4'-DDT ND 10 EPA 8081B Endrin Aldehyde ND 10 EPA 8081B Methoxychlor ND 10 EPA 8081B Endosulfan Sulfate ND 10 EPA 8081B Endrin Ketone ND 10 EPA 8081B Toxaphene ND 50 EPA 8081B Surrogate: Percent Recovery Control Limits TCMX DCB Source Percent Recovery RPD Analyte Result Spike Level Result Recovery Limits RPD Limit Flags SPIKE BLANKS Laboratory ID: SB0312S2 SB SBD SB SBD SB SBD gamma-bhc N/A Heptachlor N/A Aldrin N/A Dieldrin N/A Endrin N/A ,4'-DDT N/A Surrogate: TCMX DCB

123 13 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: CHLORINATED ACID HERBICIDES EPA 8151A Matrix: Soil Units: ug/kg (ppb) Date Date Analyte Result PQL Method Prepared Analyzed Flags AV-COMP8 Laboratory ID: Dalapon ND 280 EPA 8151A Dicamba ND 12 EPA 8151A MCPP ND 3000 EPA 8151A MCPA ND 1200 EPA 8151A Dichlorprop ND 87 EPA 8151A ,4-D EPA 8151A Pentachlorophenol EPA 8151A ,4,5-TP (Silvex) ND 12 EPA 8151A ,4,5-T ND 12 EPA 8151A ,4-DB ND 12 EPA 8151A Dinoseb ND 12 EPA 8151A Surrogate: Percent Recovery Control Limits DCAA AV-COMP9 Laboratory ID: Dalapon ND 310 EPA 8151A Dicamba ND 13 EPA 8151A MCPP ND 3000 EPA 8151A MCPA ND 1300 EPA 8151A Dichlorprop ND 95 EPA 8151A ,4-D EPA 8151A Pentachlorophenol ND 6.4 EPA 8151A ,4,5-TP (Silvex) ND 13 EPA 8151A ,4,5-T ND 13 EPA 8151A ,4-DB ND 13 EPA 8151A Dinoseb ND 13 EPA 8151A Surrogate: Percent Recovery Control Limits DCAA

124 14 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: CHLORINATED ACID HERBICIDES EPA 8151A Matrix: Soil Units: ug/kg (ppb) Date Date Analyte Result PQL Method Prepared Analyzed Flags AV-COMP10 Laboratory ID: Dalapon ND 300 EPA 8151A Dicamba ND 12 EPA 8151A MCPP ND 3000 EPA 8151A MCPA ND 1200 EPA 8151A Dichlorprop ND 93 EPA 8151A ,4-D ND 12 EPA 8151A Pentachlorophenol ND 6.2 EPA 8151A ,4,5-TP (Silvex) ND 12 EPA 8151A ,4,5-T ND 12 EPA 8151A ,4-DB ND 12 EPA 8151A Dinoseb ND 12 EPA 8151A Surrogate: Percent Recovery Control Limits DCAA AV-COMP11 Laboratory ID: Dalapon ND 340 EPA 8151A Dicamba ND 14 EPA 8151A MCPP ND 3000 EPA 8151A MCPA ND 1400 EPA 8151A Dichlorprop ND 100 EPA 8151A ,4-D EPA 8151A Pentachlorophenol ND 7.0 EPA 8151A ,4,5-TP (Silvex) ND 14 EPA 8151A ,4,5-T ND 14 EPA 8151A ,4-DB ND 14 EPA 8151A Dinoseb ND 14 EPA 8151A Surrogate: Percent Recovery Control Limits DCAA

125 15 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: CHLORINATED ACID HERBICIDES EPA 8151A Matrix: Soil Units: ug/kg (ppb) Date Date Analyte Result PQL Method Prepared Analyzed Flags AV-COMP12 Laboratory ID: Dalapon ND 280 EPA 8151A Dicamba ND 11 EPA 8151A MCPP ND 3000 EPA 8151A MCPA ND 1100 EPA 8151A Dichlorprop ND 87 EPA 8151A ,4-D ND 11 EPA 8151A Pentachlorophenol ND 5.8 EPA 8151A ,4,5-TP (Silvex) ND 12 EPA 8151A ,4,5-T ND 12 EPA 8151A ,4-DB ND 12 EPA 8151A Dinoseb ND 12 EPA 8151A Surrogate: Percent Recovery Control Limits DCAA AV-COMP13 Laboratory ID: Dalapon ND 290 EPA 8151A Dicamba ND 12 EPA 8151A MCPP ND 3000 EPA 8151A MCPA ND 1200 EPA 8151A Dichlorprop ND 89 EPA 8151A ,4-D ND 12 EPA 8151A Pentachlorophenol ND 6.0 EPA 8151A ,4,5-TP (Silvex) ND 12 EPA 8151A ,4,5-T ND 12 EPA 8151A ,4-DB ND 12 EPA 8151A Dinoseb ND 12 EPA 8151A Surrogate: Percent Recovery Control Limits DCAA

126 16 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: CHLORINATED ACID HERBICIDES EPA 8151A Matrix: Soil Units: ug/kg (ppb) Date Date Analyte Result PQL Method Prepared Analyzed Flags AV-COMP14 Laboratory ID: Dalapon ND 310 EPA 8151A Dicamba ND 13 EPA 8151A MCPP ND 3000 EPA 8151A MCPA ND 1200 EPA 8151A Dichlorprop ND 95 EPA 8151A ,4-D EPA 8151A Pentachlorophenol ND 6.3 EPA 8151A ,4,5-TP (Silvex) ND 13 EPA 8151A ,4,5-T ND 13 EPA 8151A ,4-DB ND 13 EPA 8151A Dinoseb ND 13 EPA 8151A Surrogate: Percent Recovery Control Limits DCAA

127 17 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: CHLORINATED ACID HERBICIDES EPA 8151A QUALITY CONTROL Matrix: Soil Units: ug/kg (ppb) Date Date Analyte Result PQL Method Prepared Analyzed Flags METHOD BLANK Laboratory ID: MB0316S1 Dalapon ND 230 EPA 8151A Dicamba ND 9.4 EPA 8151A MCPP ND 2800 EPA 8151A MCPA ND 940 EPA 8151A Dichlorprop ND 71 EPA 8151A ,4-D ND 9.4 EPA 8151A Pentachlorophenol ND 4.8 EPA 8151A ,4,5-TP (Silvex) ND 9.5 EPA 8151A ,4,5-T ND 9.5 EPA 8151A ,4-DB ND 9.5 EPA 8151A Dinoseb ND 9.5 EPA 8151A Surrogate: Percent Recovery Control Limits DCAA Source Percent Recovery RPD Analyte Result Spike Level Result Recovery Limits RPD Limit Flags SPIKE BLANKS Laboratory ID: SB0316S1 SB SBD SB SBD SB SBD Dicamba N/A ,4-D N/A Pentachlorophenol N/A ,4,5-T N/A ,4-DB N/A Surrogate: DCAA

128 18 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: TOTAL METALS EPA 6010C/7471B Matrix: Units: Soil mg/kg (ppm) Date Date Analyte Result PQL EPA Method Prepared Analyzed Flags Lab ID: AV-COMP8 Arsenic ND C Cadmium C Chromium C Lead C Mercury B Lab ID: AV-COMP9 Arsenic ND C Cadmium ND C Chromium C Lead C Mercury ND B Lab ID: AV-COMP10 Arsenic ND C Cadmium ND C Chromium C Lead C Mercury ND B

129 19 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: TOTAL METALS EPA 6010C/7471B Matrix: Units: Soil mg/kg (ppm) Date Date Analyte Result PQL EPA Method Prepared Analyzed Flags Lab ID: AV-COMP11 Arsenic ND C Cadmium ND C Chromium C Lead C Mercury ND B Lab ID: AV-COMP12 Arsenic ND C Cadmium C Chromium C Lead C Mercury ND B Lab ID: AV-COMP13 Arsenic C Cadmium ND C Chromium C Lead C Mercury ND B

130 20 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: TOTAL METALS EPA 6010C/7471B Matrix: Units: Soil mg/kg (ppm) Date Date Analyte Result PQL EPA Method Prepared Analyzed Flags Lab ID: AV-COMP14 Arsenic ND C Cadmium ND C Chromium C Lead C Mercury ND B

131 21 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: TOTAL METALS EPA 6010C/7471B METHOD BLANK QUALITY CONTROL Date Extracted: Date Analyzed: Matrix: Units: Soil mg/kg (ppm) Lab ID: MB0310SM1&MB0310S1 Analyte Method Result PQL Arsenic 6010C ND 10 Cadmium 6010C ND 0.50 Chromium 6010C ND 0.50 Lead 6010C ND 5.0 Mercury 7471B ND 0.25

132 22 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: TOTAL METALS EPA 6010C/7471B DUPLICATE QUALITY CONTROL Date Extracted: Date Analyzed: Matrix: Units: Soil mg/kg (ppm) Lab ID: Sample Duplicate Analyte Result Result RPD PQL Flags Arsenic ND ND NA 10 Cadmium ND ND NA 0.50 Chromium Lead ND ND NA 5.0 Mercury ND ND NA 0.25

133 23 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: TOTAL METALS EPA 6010C/7471B MS/MSD QUALITY CONTROL Date Extracted: Date Analyzed: Matrix: Units: Soil mg/kg (ppm) Lab ID: Spike Percent Percent Analyte Level MS Recovery MSD Recovery RPD Flags Arsenic Cadmium Chromium Lead Mercury

134 24 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: TOTAL METALS EPA 6010C/7471B SPIKE BLANK QUALITY CONTROL Date Extracted: Date Analyzed: Matrix: Units: Soil mg/kg (ppm) Lab ID: SB0310SM1&SB0310S1 Spike SB Percent Analyte Method Level Result Recovery Arsenic 6010C Cadmium 6010C Chromium 6010C Lead 6010C Mercury 7471B

135 25 Date of Report: March 20, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: % MOISTURE Date Analyzed: 3-10&12-15 Client ID Lab ID % Moisture AV-COMP AV-COMP AV-COMP AV-COMP AV-COMP AV-COMP AV-COMP

136 26 Data Qualifiers and Abbreviations A - Due to a high sample concentration, the amount spiked is insufficient for meaningful MS/MSD recovery data. B - The analyte indicated was also found in the blank sample. C - The duplicate RPD is outside control limits due to high result variability when analyte concentrations are within five times the quantitation limit. E - The value reported exceeds the quantitation range and is an estimate. F - Surrogate recovery data is not available due to the high concentration of coeluting target compounds. H - The analyte indicated is a common laboratory solvent and may have been introduced during sample preparation, and be impacting the sample result. I - Compound recovery is outside of the control limits. J - The value reported was below the practical quantitation limit. The value is an estimate. K - Sample duplicate RPD is outside control limits due to sample inhomogeneity. The sample was re-extracted and re-analyzed with similar results. L - The RPD is outside of the control limits. M - Hydrocarbons in the gasoline range are impacting the diesel range result. M1 - Hydrocarbons in the gasoline range (toluene-napthalene) are present in the sample. N - Hydrocarbons in the lube oil range are impacting the diesel range result. N1 - Hydrocarbons in diesel range are impacting lube oil range results. O - Hydrocarbons indicative of heavier fuels are present in the sample and are impacting the gasoline result. P - The RPD of the detected concentrations between the two columns is greater than 40. Q - Surrogate recovery is outside of the control limits. S - Surrogate recovery data is not available due to the necessary dilution of the sample. T - The sample chromatogram is not similar to a typical. U - The analyte was analyzed for, but was not detected above the reported sample quantitation limit. U1 - The practical quantitation limit is elevated due to interferences present in the sample. V - Matrix Spike/Matrix Spike Duplicate recoveries are outside control limits due to matrix effects. W - Matrix Spike/Matrix Spike Duplicate RPD are outside control limits due to matrix effects. X - Sample extract treated with a mercury cleanup procedure. X1- Sample extract treated with a Sulfuric acid/silica gel cleanup procedure. Y - The calibration verification for this analyte exceeded the 20% drift specified in method 8260C, and therefore the reported result should be considered an estimate. The overall performance of the calibration verification standard met the acceptance criteria of the method. Z - ND - Not Detected at PQL PQL - Practical Quantitation Limit RPD - Relative Percent Difference

137

138

139

140

141 14648 NE 95 th Street, Redmond, WA (425) April 1, 2015 Ross Stainsby Hart Crowser, Inc Westlake Avenue North, Suite 200 Seattle, WA Re: Analytical Data for Project Laboratory Reference No B Dear Ross: Enclosed are the analytical results and associated quality control data for samples submitted on March 5, The standard policy of OnSite Environmental, Inc. is to store your samples for 30 days from the date of receipt. If you require longer storage, please contact the laboratory. We appreciate the opportunity to be of service to you on this project. If you have any questions concerning the data, or need additional information, please feel free to call me. Sincerely, David Baumeister Project Manager Enclosures

142 2 Date of Report: April 1, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: B Case Narrative Samples were collected on March 5, 2015 and received by the laboratory on March 5, They were maintained at the laboratory at a temperature of 2 o C to 6 o C. General QA/QC issues associated with the analytical data enclosed in this laboratory report will be indicated with a reference to a comment or explanation on the Data Qualifier page. More complex and involved QA/QC issues will be discussed in detail below.

143 3 Date of Report: April 1, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: B TOTAL METALS EPA 6010C/7471B Matrix: Units: Soil mg/kg (ppm) Date Date Analyte Result PQL EPA Method Prepared Analyzed Flags Lab ID: AV-COMP8-SS1 Mercury B Lab ID: AV-COMP8-SS2 Mercury ND B Lab ID: AV-COMP8-SS3 Mercury ND B Lab ID: AV-COMP11-SS1 Lead C Lab ID: AV-COMP11-SS2 Lead C Lab ID: AV-COMP11-SS3 Lead C

144 4 Date of Report: April 1, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: B TOTAL METALS EPA 6010C Matrix: Units: Soil mg/kg (ppm) Date Date Analyte Result PQL EPA Method Prepared Analyzed Flags Lab ID: AV-COMP11-SS4 Lead C Lab ID: AV-COMP11-SS5 Lead C Lab ID: AV-COMP13-SS1 Arsenic C Lab ID: AV-COMP13-SS2 Arsenic C Lab ID: AV-COMP13-SS3 Arsenic C

145 5 Date of Report: April 1, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: B TOTAL METALS EPA 6010C/7471B METHOD BLANK QUALITY CONTROL Date Extracted: Date Analyzed: 3-26& &27-15 Matrix: Units: Soil mg/kg (ppm) Lab ID: MB0326SM1&MB0327S1 Analyte Method Result PQL Arsenic 6010C ND 10 Lead 6010C ND 5.0 Mercury 7471B ND 0.25

146 6 Date of Report: April 1, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: B TOTAL METALS EPA 6010C/7471B DUPLICATE QUALITY CONTROL Date Extracted: Date Analyzed: 3-26& &27-15 Matrix: Units: Soil mg/kg (ppm) Lab ID: Sample Duplicate Analyte Result Result RPD PQL Flags Arsenic ND ND NA 10 Lead C Mercury ND ND NA 0.25

147 7 Date of Report: April 1, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: B TOTAL METALS EPA 6010C/7471B MS/MSD QUALITY CONTROL Date Extracted: Date Analyzed: 3-26& &27-15 Matrix: Units: Soil mg/kg (ppm) Lab ID: Spike Percent Percent Analyte Level MS Recovery MSD Recovery RPD Flags Arsenic Lead Mercury

148 8 Date of Report: April 1, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: B TOTAL METALS EPA 6010C/7471B SPIKE BLANK QUALITY CONTROL Date Extracted: Date Analyzed: 3-26& &27-15 Matrix: Units: Soil mg/kg (ppm) Lab ID: SB0326SM1&SB0327S1 Spike SB Percent Analyte Method Level Result Recovery Arsenic 6010C Lead 6010C Mercury 7471B

149 9 Date of Report: April 1, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: B TCLP MERCURY EPA 1311/7470A Matrix: Units: TCLP Extract mg/l (ppm) Date Date Analyte Result PQL EPA Method Prepared Analyzed Flags Lab ID: AV-COMP8 Mercury ND A

150 10 Date of Report: April 1, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: B TCLP MERCURY EPA 1311/7470A METHOD BLANK QUALITY CONTROL Date Prepared: Date Extracted: Date Analyzed: Matrix: Units: TCLP Extract mg/l (ppm) Lab ID: MB0325T1 Analyte Method Result PQL Mercury 7470A ND

151 11 Date of Report: April 1, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: B TCLP MERCURY EPA 1311/7470A DUPLICATE QUALITY CONTROL Date Prepared: Date Extracted: Date Analyzed: Matrix: Units: TCLP Extract mg/l (ppm) Lab ID: Sample Duplicate Analyte Result Result RPD PQL Flags Mercury ND ND NA

152 12 Date of Report: April 1, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: B TCLP MERCURY EPA 1311/7470A MS/MSD QUALITY CONTROL Date Prepared: Date Extracted: Date Analyzed: Matrix: Units: TCLP Extract mg/l (ppm) Lab ID: Spike Percent Percent Analyte Level MS Recovery MSD Recovery RPD Flags Mercury

153 13 Date of Report: April 1, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: B TCLP MERCURY EPA 1311/7470A SPIKE BLANK QUALITY CONTROL Date Prepared: Date Extracted: Date Analyzed: Matrix: Units: TCLP Extract mg/l (ppm) Lab ID: SB0325T1 Spike Percent Analyte Method Level SB Recovery Mercury 7470A

154 14 Date of Report: April 1, 2015 Samples Submitted: March 5, 2015 Laboratory Reference: B % MOISTURE Date Analyzed: Client ID Lab ID % Moisture AV-COMP8-SS AV-COMP8-SS AV-COMP8-SS AV-COMP11-SS AV-COMP11-SS AV-COMP11-SS AV-COMP11-SS AV-COMP11-SS AV-COMP13-SS AV-COMP13-SS AV-COMP13-SS

155 15 Data Qualifiers and Abbreviations A - Due to a high sample concentration, the amount spiked is insufficient for meaningful MS/MSD recovery data. B - The analyte indicated was also found in the blank sample. C - The duplicate RPD is outside control limits due to high result variability when analyte concentrations are within five times the quantitation limit. E - The value reported exceeds the quantitation range and is an estimate. F - Surrogate recovery data is not available due to the high concentration of coeluting target compounds. H - The analyte indicated is a common laboratory solvent and may have been introduced during sample preparation, and be impacting the sample result. I - Compound recovery is outside of the control limits. J - The value reported was below the practical quantitation limit. The value is an estimate. K - Sample duplicate RPD is outside control limits due to sample inhomogeneity. The sample was re-extracted and re-analyzed with similar results. L - The RPD is outside of the control limits. M - Hydrocarbons in the gasoline range are impacting the diesel range result. M1 - Hydrocarbons in the gasoline range (toluene-napthalene) are present in the sample. N - Hydrocarbons in the lube oil range are impacting the diesel range result. N1 - Hydrocarbons in diesel range are impacting lube oil range results. O - Hydrocarbons indicative of heavier fuels are present in the sample and are impacting the gasoline result. P - The RPD of the detected concentrations between the two columns is greater than 40. Q - Surrogate recovery is outside of the control limits. S - Surrogate recovery data is not available due to the necessary dilution of the sample. T - The sample chromatogram is not similar to a typical. U - The analyte was analyzed for, but was not detected above the reported sample quantitation limit. U1 - The practical quantitation limit is elevated due to interferences present in the sample. V - Matrix Spike/Matrix Spike Duplicate recoveries are outside control limits due to matrix effects. W - Matrix Spike/Matrix Spike Duplicate RPD are outside control limits due to matrix effects. X - Sample extract treated with a mercury cleanup procedure. X1- Sample extract treated with a Sulfuric acid/silica gel cleanup procedure. Y - The calibration verification for this analyte exceeded the 20% drift specified in method 8260C, and therefore the reported result should be considered an estimate. The overall performance of the calibration verification standard met the acceptance criteria of the method. Z - ND - Not Detected at PQL PQL - Practical Quantitation Limit RPD - Relative Percent Difference

156

157

158

159

160 14648 NE 95 th Street, Redmond, WA (425) May 6, 2015 Ross Stainsby Hart Crowser, Inc Westlake Avenue North, Suite 200 Seattle, WA Re: Analytical Data for Project Laboratory Reference No Dear Ross: Enclosed are the analytical results and associated quality control data for samples submitted on April 24, The standard policy of OnSite Environmental, Inc. is to store your samples for 30 days from the date of receipt. If you require longer storage, please contact the laboratory. We appreciate the opportunity to be of service to you on this project. If you have any questions concerning the data, or need additional information, please feel free to call me. Sincerely, David Baumeister Project Manager Enclosures

161 2 Date of Report: May 6, 2015 Samples Submitted: April 24, 2015 Laboratory Reference: Case Narrative Samples were collected on April 24, 2015 and received by the laboratory on April 24, They were maintained at the laboratory at a temperature of 2 o C to 6 o C. Please note that all soil sample results are reported on a dry-weight basis, unless otherwise noted below. General QA/QC issues associated with the analytical data enclosed in this laboratory report will be indicated with a reference to a comment or explanation on the Data Qualifier page. More complex and involved QA/QC issues will be discussed in detail below.

162 3 Date of Report: May 6, 2015 Samples Submitted: April 24, 2015 Laboratory Reference: ORGANOCHLORINE PESTICIDES EPA 8081B Matrix: Soil Units: ug/kg (ppb) Date Date Analyte Result PQL Method Prepared Analyzed Flags AV-CORE " Laboratory ID: Dieldrin ND 11 EPA 8081B Surrogate: Percent Recovery Control Limits TCMX DCB

163 4 Date of Report: May 6, 2015 Samples Submitted: April 24, 2015 Laboratory Reference: ORGANOCHLORINE PESTICIDES EPA 8081B Matrix: Soil Units: ug/kg (ppb) Date Date Analyte Result PQL Method Prepared Analyzed Flags AV-CORE " Laboratory ID: Dieldrin ND 11 EPA 8081B Surrogate: Percent Recovery Control Limits TCMX DCB

164 5 Date of Report: May 6, 2015 Samples Submitted: April 24, 2015 Laboratory Reference: ORGANOCHLORINE PESTICIDES EPA 8081B QUALITY CONTROL Matrix: Soil Units: ug/kg (ppb) Date Date Analyte Result PQL Method Prepared Analyzed Flags METHOD BLANK Laboratory ID: MB0427S1 Dieldrin ND 10 EPA 8081B Surrogate: Percent Recovery Control Limits TCMX DCB Source Percent Recovery RPD Analyte Result Spike Level Result Recovery Limits RPD Limit Flags SPIKE BLANKS Laboratory ID: SB0427S1 SB SBD SB SBD SB SBD Dieldrin N/A Surrogate: TCMX DCB

165 6 Date of Report: May 6, 2015 Samples Submitted: April 24, 2015 Laboratory Reference: ORGANOCHLORINE PESTICIDES EPA 8081B Matrix: Soil Units: ug/kg (ppb) Date Date Analyte Result PQL Method Prepared Analyzed Flags AV-COMP-15 Laboratory ID: alpha-bhc ND 6.5 EPA 8081B gamma-bhc ND 6.5 EPA 8081B beta-bhc ND 6.5 EPA 8081B delta-bhc ND 6.5 EPA 8081B Heptachlor ND 6.5 EPA 8081B Aldrin EPA 8081B Heptachlor Epoxide ND 6.5 EPA 8081B gamma-chlordane ND 13 EPA 8081B alpha-chlordane ND 13 EPA 8081B ,4'-DDE EPA 8081B Endosulfan I ND 6.5 EPA 8081B Dieldrin EPA 8081B Endrin ND 13 EPA 8081B ,4'-DDD ND 13 EPA 8081B Endosulfan II ND 13 EPA 8081B ,4'-DDT EPA 8081B Endrin Aldehyde ND 13 EPA 8081B Methoxychlor ND 13 EPA 8081B Endosulfan Sulfate ND 13 EPA 8081B Endrin Ketone ND 13 EPA 8081B Toxaphene ND 65 EPA 8081B Surrogate: Percent Recovery Control Limits TCMX DCB

166 7 Date of Report: May 6, 2015 Samples Submitted: April 24, 2015 Laboratory Reference: ORGANOCHLORINE PESTICIDES EPA 8081B QUALITY CONTROL Matrix: Soil Units: ug/kg (ppb) Date Date Analyte Result PQL Method Prepared Analyzed Flags METHOD BLANK Laboratory ID: MB0505S1 alpha-bhc ND 5.0 EPA 8081B gamma-bhc ND 5.0 EPA 8081B beta-bhc ND 5.0 EPA 8081B delta-bhc ND 5.0 EPA 8081B Heptachlor ND 5.0 EPA 8081B Aldrin ND 5.0 EPA 8081B Heptachlor Epoxide ND 5.0 EPA 8081B gamma-chlordane ND 10 EPA 8081B alpha-chlordane ND 10 EPA 8081B ,4'-DDE ND 10 EPA 8081B Endosulfan I ND 5.0 EPA 8081B Dieldrin ND 10 EPA 8081B Endrin ND 10 EPA 8081B ,4'-DDD ND 10 EPA 8081B Endosulfan II ND 10 EPA 8081B ,4'-DDT ND 10 EPA 8081B Endrin Aldehyde ND 10 EPA 8081B Methoxychlor ND 10 EPA 8081B Endosulfan Sulfate ND 10 EPA 8081B Endrin Ketone ND 10 EPA 8081B Toxaphene ND 50 EPA 8081B Surrogate: Percent Recovery Control Limits TCMX DCB Source Percent Recovery RPD Analyte Result Spike Level Result Recovery Limits RPD Limit Flags MATRIX SPIKES Laboratory ID: MS MSD MS MSD MS MSD gamma-bhc ND Heptachlor ND Aldrin Dieldrin NA NA NA NA NA 21 Endrin ND ,4'-DDT Surrogate: TCMX DCB

167 8 Date of Report: May 6, 2015 Samples Submitted: April 24, 2015 Laboratory Reference: ORGANOCHLORINE PESTICIDES EPA 8081B SPIKE BLANK QUALITY CONTROL Matrix: Soil Units: ug/kg (ppb) Source Percent Recovery RPD Analyte Result Spike Level Result Recovery Limits RPD Limit Flags SPIKE BLANKS Laboratory ID: SB0505S1 SB SBD SB SBD SB SBD gamma-bhc N/A Heptachlor N/A Aldrin N/A Dieldrin N/A Endrin N/A ,4'-DDT N/A Surrogate: TCMX DCB

168 9 Date of Report: May 6, 2015 Samples Submitted: April 24, 2015 Laboratory Reference: TOTAL METALS EPA 6010C/7471B Matrix: Units: Soil mg/kg (ppm) Date Date Analyte Result PQL EPA Method Prepared Analyzed Flags Lab ID: AV-CORE " Lead C Mercury B Lab ID: AV-CORE " Lead C Mercury ND B Lab ID: AV-CORE " Cadmium C Lead C Lab ID: AV-CORE Cadmium ND C Lead C Lab ID: AV-CORE " Cadmium ND C Lead C

169 10 Date of Report: May 6, 2015 Samples Submitted: April 24, 2015 Laboratory Reference: TOTAL METALS EPA 6010C Matrix: Units: Soil mg/kg (ppm) Date Date Analyte Result PQL EPA Method Prepared Analyzed Flags Lab ID: AV-CORE " Cadmium ND C Lead ND C Lab ID: AV-CORE " Lead C Lab ID: AV-CORE " Lead ND C

170 11 Date of Report: May 6, 2015 Samples Submitted: April 24, 2015 Laboratory Reference: TOTAL METALS EPA 6010C METHOD BLANK QUALITY CONTROL Date Extracted: Date Analyzed: Matrix: Units: Soil mg/kg (ppm) Lab ID: MB0427SM1 Analyte Method Result PQL Cadmium 6010C ND 0.50 Lead 6010C ND 5.0

171 12 Date of Report: May 6, 2015 Samples Submitted: April 24, 2015 Laboratory Reference: TOTAL MERCURY EPA 7471B METHOD BLANK QUALITY CONTROL Date Extracted: Date Analyzed: Matrix: Units: Soil mg/kg (ppm) Lab ID: MB0430S1 Analyte Method Result PQL Mercury 7471B ND 0.25

172 13 Date of Report: May 6, 2015 Samples Submitted: April 24, 2015 Laboratory Reference: TOTAL METALS EPA 6010C DUPLICATE QUALITY CONTROL Date Extracted: Date Analyzed: Matrix: Units: Soil mg/kg (ppm) Lab ID: Sample Duplicate Analyte Result Result RPD PQL Flags Cadmium ND ND NA 0.50 Lead

173 14 Date of Report: May 6, 2015 Samples Submitted: April 24, 2015 Laboratory Reference: TOTAL MERCURY EPA 7471B DUPLICATE QUALITY CONTROL Date Extracted: Date Analyzed: Matrix: Units: Soil mg/kg (ppm) Lab ID: Sample Duplicate Analyte Result Result RPD PQL Flags Mercury ND ND NA 0.25

174 15 Date of Report: May 6, 2015 Samples Submitted: April 24, 2015 Laboratory Reference: TOTAL METALS EPA 6010C MS/MSD QUALITY CONTROL Date Extracted: Date Analyzed: Matrix: Units: Soil mg/kg (ppm) Lab ID: Spike Percent Percent Analyte Level MS Recovery MSD Recovery RPD Flags Cadmium Lead

175 16 Date of Report: May 6, 2015 Samples Submitted: April 24, 2015 Laboratory Reference: TOTAL MERCURY EPA 7471B MS/MSD QUALITY CONTROL Date Extracted: Date Analyzed: Matrix: Units: Soil mg/kg (ppm) Lab ID: Spike Percent Percent Analyte Level MS Recovery MSD Recovery RPD Flags Mercury

176 17 Date of Report: May 6, 2015 Samples Submitted: April 24, 2015 Laboratory Reference: TOTAL METALS EPA 6010C SPIKE BLANK QUALITY CONTROL Date Extracted: Date Analyzed: Matrix: Units: Soil mg/kg (ppm) Lab ID: SB0427SM1 Spike SB Percent Analyte Method Level Result Recovery Cadmium 6010C Lead 6010C

177 18 Date of Report: May 6, 2015 Samples Submitted: April 24, 2015 Laboratory Reference: TOTAL MERCURY EPA 7471B SPIKE BLANK QUALITY CONTROL Date Extracted: Date Analyzed: Matrix: Units: Soil mg/kg (ppm) Lab ID: SB0430S1 Spike SB Percent Analyte Method Level Result Recovery Mercury 7471B

178 19 Date of Report: May 6, 2015 Samples Submitted: April 24, 2015 Laboratory Reference: PCBs EPA 8082A Matrix: Soil Units: mg/kg (ppm) Date Date Analyte Result PQL Method Prepared Analyzed Flags AV-CORE " Laboratory ID: Aroclor 1016 ND EPA 8082A Aroclor 1221 ND EPA 8082A Aroclor 1232 ND EPA 8082A Aroclor 1242 ND EPA 8082A Aroclor 1248 ND EPA 8082A Aroclor 1254 ND EPA 8082A Aroclor 1260 ND EPA 8082A Surrogate: Percent Recovery Control Limits DCB AV-CORE " Laboratory ID: Aroclor 1016 ND EPA 8082A Aroclor 1221 ND EPA 8082A Aroclor 1232 ND EPA 8082A Aroclor 1242 ND EPA 8082A Aroclor 1248 ND EPA 8082A Aroclor 1254 ND EPA 8082A Aroclor 1260 ND EPA 8082A Surrogate: Percent Recovery Control Limits DCB

179 20 Date of Report: May 6, 2015 Samples Submitted: April 24, 2015 Laboratory Reference: PCBs EPA 8082A QUALITY CONTROL Matrix: Soil Units: mg/kg (ppm) Date Date Analyte Result PQL Method Prepared Analyzed Flags METHOD BLANK Laboratory ID: MB0501S1 Aroclor 1016 ND EPA 8082A Aroclor 1221 ND EPA 8082A Aroclor 1232 ND EPA 8082A Aroclor 1242 ND EPA 8082A Aroclor 1248 ND EPA 8082A Aroclor 1254 ND EPA 8082A Aroclor 1260 ND EPA 8082A Surrogate: Percent Recovery Control Limits DCB Source Percent Recovery RPD Analyte Result Spike Level Result Recovery Limits RPD Limit Flags SPIKE BLANKS Laboratory ID: SB0501S1 SB SBD SB SBD SB SBD Aroclor N/A Surrogate: DCB

180 21 Date of Report: May 6, 2015 Samples Submitted: April 24, 2015 Laboratory Reference: % MOISTURE Date Analyzed: 4-27&5-4&5-15 Client ID Lab ID % Moisture AV-CORE " AV-CORE " AV-CORE " AV-CORE AV-CORE " AV-CORE " AV-CORE " AV-CORE " AV-COMP

181 22 Data Qualifiers and Abbreviations A - Due to a high sample concentration, the amount spiked is insufficient for meaningful MS/MSD recovery data. B - The analyte indicated was also found in the blank sample. C - The duplicate RPD is outside control limits due to high result variability when analyte concentrations are within five times the quantitation limit. E - The value reported exceeds the quantitation range and is an estimate. F - Surrogate recovery data is not available due to the high concentration of coeluting target compounds. H - The analyte indicated is a common laboratory solvent and may have been introduced during sample preparation, and be impacting the sample result. I - Compound recovery is outside of the control limits. J - The value reported was below the practical quantitation limit. The value is an estimate. K - Sample duplicate RPD is outside control limits due to sample inhomogeneity. The sample was re-extracted and re-analyzed with similar results. L - The RPD is outside of the control limits. M - Hydrocarbons in the gasoline range are impacting the diesel range result. M1 - Hydrocarbons in the gasoline range (toluene-napthalene) are present in the sample. N - Hydrocarbons in the lube oil range are impacting the diesel range result. N1 - Hydrocarbons in diesel range are impacting lube oil range results. O - Hydrocarbons indicative of heavier fuels are present in the sample and are impacting the gasoline result. P - The RPD of the detected concentrations between the two columns is greater than 40. Q - Surrogate recovery is outside of the control limits. S - Surrogate recovery data is not available due to the necessary dilution of the sample. T - The sample chromatogram is not similar to a typical. U - The analyte was analyzed for, but was not detected above the reported sample quantitation limit. U1 - The practical quantitation limit is elevated due to interferences present in the sample. V - Matrix Spike/Matrix Spike Duplicate recoveries are outside control limits due to matrix effects. W - Matrix Spike/Matrix Spike Duplicate RPD are outside control limits due to matrix effects. X - Sample extract treated with a mercury cleanup procedure. X1- Sample extract treated with a Sulfuric acid/silica gel cleanup procedure. Y - The calibration verification for this analyte exceeded the 20% drift specified in method 8260C, and therefore the reported result should be considered an estimate. The overall performance of the calibration verification standard met the acceptance criteria of the method. Z - ND - Not Detected at PQL PQL - Practical Quantitation Limit RPD - Relative Percent Difference

182

183

184 14648 NE 95 th Street, Redmond, WA (425) May 18, 2015 Ross Stainsby Hart Crowser, Inc Westlake Avenue North, Suite 200 Seattle, WA Re: Analytical Data for Project Laboratory Reference No B Dear Ross: Enclosed are the analytical results and associated quality control data for samples submitted on April 24, The standard policy of OnSite Environmental, Inc. is to store your samples for 30 days from the date of receipt. If you require longer storage, please contact the laboratory. We appreciate the opportunity to be of service to you on this project. If you have any questions concerning the data, or need additional information, please feel free to call me. Sincerely, David Baumeister Project Manager Enclosures

185 2 Date of Report: May 18, 2015 Samples Submitted: April 24, 2015 Laboratory Reference: B Case Narrative Samples were collected on April 24, 2015 and received by the laboratory on April 24, They were maintained at the laboratory at a temperature of 2 o C to 6 o C. Please note that all soil sample results are reported on a dry-weight basis, unless otherwise noted below. General QA/QC issues associated with the analytical data enclosed in this laboratory report will be indicated with a reference to a comment or explanation on the Data Qualifier page. More complex and involved QA/QC issues will be discussed in detail below. Total Metals EPA 6010C/7471B Analysis The duplicate RPD for Chromium is outside control limits due to sample inhomogeneity. The sample was re-extracted and re-analyzed with similar results. Any other QA/QC issues associated with this extraction and analysis will be indicated with a footnote reference and discussed in detail on the Data Qualifier page.

186 3 Date of Report: May 18, 2015 Samples Submitted: April 24, 2015 Laboratory Reference: B TOTAL METALS EPA 6010C/7471B Matrix: Units: Soil mg/kg (ppm) Date Date Analyte Result PQL EPA Method Prepared Analyzed Flags Lab ID: AV-COMP-15 Arsenic ND C Cadmium C Chromium C Lead C Mercury ND B

187 4 Date of Report: May 18, 2015 Samples Submitted: April 24, 2015 Laboratory Reference: B TOTAL METALS EPA 6010C/7471B METHOD BLANK QUALITY CONTROL Date Extracted: Date Analyzed: 5-11& &14-15 Matrix: Units: Soil mg/kg (ppm) Lab ID: MB0513SM2&MB0511S1 Analyte Method Result PQL Arsenic 6010C ND 10 Cadmium 6010C ND 0.50 Chromium 6010C ND 0.50 Lead 6010C ND 5.0 Mercury 7471B ND 0.25

188 5 Date of Report: May 18, 2015 Samples Submitted: April 24, 2015 Laboratory Reference: B TOTAL METALS EPA 6010C/7471B DUPLICATE QUALITY CONTROL Date Extracted: Date Analyzed: 5-11& &14-15 Matrix: Units: Soil mg/kg (ppm) Lab ID: Sample Duplicate Analyte Result Result RPD PQL Flags Arsenic ND ND NA 10 Cadmium ND ND NA 0.50 Chromium K Lead ND ND NA 5.0 Mercury ND ND NA 0.25

189 6 Date of Report: May 18, 2015 Samples Submitted: April 24, 2015 Laboratory Reference: B TOTAL METALS EPA 6010C/7471B MS/MSD QUALITY CONTROL Date Extracted: Date Analyzed: 5-11& &14-15 Matrix: Units: Soil mg/kg (ppm) Lab ID: Spike Percent Percent Analyte Level MS Recovery MSD Recovery RPD Flags Arsenic Cadmium Chromium Lead Mercury

190 7 Date of Report: May 18, 2015 Samples Submitted: April 24, 2015 Laboratory Reference: B TOTAL METALS EPA 6010C/7471B SPIKE BLANK QUALITY CONTROL Date Extracted: Date Analyzed: 5-11& &14-15 Matrix: Units: Soil mg/kg (ppm) Lab ID: SB0513SM2&SB0511S1 Spike SB Percent Analyte Method Level Result Recovery Arsenic 6010C Cadmium 6010C Chromium 6010C Lead 6010C Mercury 7471B

191 8 Date of Report: May 18, 2015 Samples Submitted: April 24, 2015 Laboratory Reference: B NWTPH-Dx Matrix: Soil Units: mg/kg (ppm) Date Date Analyte Result PQL Method Prepared Analyzed Flags AV-COMP-15 Laboratory ID: Diesel Range Organics ND 33 NWTPH-Dx Lube Oil Range Organics NWTPH-Dx Surrogate: Percent Recovery Control Limits o-terphenyl

192 9 Date of Report: May 18, 2015 Samples Submitted: April 24, 2015 Laboratory Reference: B NWTPH-Dx QUALITY CONTROL Matrix: Soil Units: mg/kg (ppm) Date Date Analyte Result PQL Method Prepared Analyzed Flags METHOD BLANK Laboratory ID: MB0508S1 Diesel Range Organics ND 25 NWTPH-Dx Lube Oil Range Organics ND 50 NWTPH-Dx Surrogate: Percent Recovery Control Limits o-terphenyl Source Percent Recovery RPD Analyte Result Spike Level Result Recovery Limits RPD Limit Flags DUPLICATE Laboratory ID: ORIG DUP Diesel Range ND ND NA NA NA NA NA NA Lube Oil Range Organics NA NA NA NA 18 NA Surrogate: o-terphenyl SPIKE BLANK Laboratory ID: SB0508S1 Diesel Fuel # NA NA NA Surrogate: o-terphenyl

193 10 Data Qualifiers and Abbreviations A - Due to a high sample concentration, the amount spiked is insufficient for meaningful MS/MSD recovery data. B - The analyte indicated was also found in the blank sample. C - The duplicate RPD is outside control limits due to high result variability when analyte concentrations are within five times the quantitation limit. E - The value reported exceeds the quantitation range and is an estimate. F - Surrogate recovery data is not available due to the high concentration of coeluting target compounds. H - The analyte indicated is a common laboratory solvent and may have been introduced during sample preparation, and be impacting the sample result. I - Compound recovery is outside of the control limits. J - The value reported was below the practical quantitation limit. The value is an estimate. K - Sample duplicate RPD is outside control limits due to sample inhomogeneity. The sample was re-extracted and re-analyzed with similar results. L - The RPD is outside of the control limits. M - Hydrocarbons in the gasoline range are impacting the diesel range result. M1 - Hydrocarbons in the gasoline range (toluene-napthalene) are present in the sample. N - Hydrocarbons in the lube oil range are impacting the diesel range result. N1 - Hydrocarbons in diesel range are impacting lube oil range results. O - Hydrocarbons indicative of heavier fuels are present in the sample and are impacting the gasoline result. P - The RPD of the detected concentrations between the two columns is greater than 40. Q - Surrogate recovery is outside of the control limits. S - Surrogate recovery data is not available due to the necessary dilution of the sample. T - The sample chromatogram is not similar to a typical. U - The analyte was analyzed for, but was not detected above the reported sample quantitation limit. U1 - The practical quantitation limit is elevated due to interferences present in the sample. V - Matrix Spike/Matrix Spike Duplicate recoveries are outside control limits due to matrix effects. W - Matrix Spike/Matrix Spike Duplicate RPD are outside control limits due to matrix effects. X - Sample extract treated with a mercury cleanup procedure. X1- Sample extract treated with a Sulfuric acid/silica gel cleanup procedure. Y - The calibration verification for this analyte exceeded the 20% drift specified in method 8260C, and therefore the reported result should be considered an estimate. The overall performance of the calibration verification standard met the acceptance criteria of the method. Z - ND - Not Detected at PQL PQL - Practical Quantitation Limit RPD - Relative Percent Difference

194