Aspect consulting, LLC

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1 October 17, 2014 Mr. Ed Jones Washington State Department of Ecology, NWRO th Avenue SE Bellevue, Washington Re: West of 4 th Site Agreed Order #DE10402 Draft West of 4th Groundwater Monitoring Program Plan Dear Mr. Jones: Please find enclosed the Draft West of 4th Groundwater Monitoring Program Plan. This report was prepared by Pacific Groundwater Group on behalf of the four potentially liable persons (PLPs) [Art Brass Plating, Blaser Die Casting, Capital Industries, and PSC Environmental Services, LLC] identified by Ecology in the Agreed Order #DE10402 for the West of 4 th Site. Sincerely, Aspect consulting, LLC Dana Cannon, LHG W4 Project Coordinator dcannon@aspectconsulting.com Attachments: Draft West of 4th Groundwater Monitoring Program Plan S:\Art Brass Plating \W4 Ecology Correspondence\Cover Letters\GWMPPdraft_Cover.docx

2 DRAFT Technical Memorandum To: From: Re: Date: Ed Jones, Washington State Department of Ecology Janet Knox and Glenn Mutti-Driscoll, Pacific Groundwater Group DRAFT West of 4 th Groundwater Monitoring Program Plan W4 Joint Deliverable, Agreed Order No. DE October 17, 2014 W4 Review Draft This draft Groundwater Monitoring Program Plan (GWMPP) was prepared by Pacific Groundwater Group on the behalf of Blaser Die Casting Co. (BDC); Capital Industries, Inc. (CI); Art Brass Plating, Inc. (ABP); and PSC Environmental Services, LLC (PSC), who are the four potential liable parties (PLPs) at the West of 4 th (W4) site. This GWMPP is intended to fulfill the requirements of Task III.1 in the Washington State Department of Ecology (Ecology) Agreed Order No. DE and is designed to cover the post-2013 Feasibility Study (FS) and draft Cleanup Action Plan (dcap) periods. Although extensions of schedule may occur, at this time, that time period will be January 2015 through December 2016, as the dcap is currently due October 14, MONITORING PROGRAM OBJECTIVES The W4 site is subdivided into two site units, with Site Unit 1 (SU1) including wells owned by ABP and PSC, and Site Unit 2 (SU2) including wells owned by BDC, CI, and PSC (Figure 1). The area of interest for the W4 site is based on the Site Conceptual Model Tech Memo extent of contamination (Aspect, 2014). The primary objective of the W4 GWMPP is to meet FS objectives and associated site data needs during the FS and dcap periods. FS objectives for the W4 site include the following: Satisfy the requirements of the W4 VI assessment/mitigation program (draft due date November 2014). Assess the centerline and boundary conditions of the chlorinated VOC plume. Assess the boundary conditions of the 1,4-dioxane plume. Evaluate biodegradation potential and the applicability of MNA as a FS remedial option. Assess groundwater flow paths and potential changes in contaminant transport pathways by conducting coordinated (same day) site-wide water level measurements. P F Eastlake Avenue East Seattle, Washington Water Resource & Environmental Consulting

3 In addition to the site-wide FS objectives, local objectives for SU1 include the following: Assess the performance of the ongoing ABP interim action (Aspect, 2008a). Assess concentrations of copper, nickel, and zinc in groundwater samples from wells located near the ABP Facility and immediately downgradient. Monitoring program objectives for SU2 are the same as the site-wide monitoring objectives. WELLS PROPOSED FOR MONITORING Tables 1 through 3 and Attachment Tables D-1 and D-2 specify which wells each PLP proposes for monitoring, the monitoring frequency, constituents, and the FS objective being served by the proposed monitoring. Note that the PSC monitoring plan has already been approved by Ecology and therefore is finalized. Well logs that document monitoring well construction can be found in the RI reports for each PLP (Aspect, 2012; Farallon, 2012; PGG, 2012; Amec Geomatrix, 2011). Figure 1 shows the location of each well proposed for monitoring and its ownership. MONITORING PROGRAM IMPLEMENTATION The PLPs will administer and implement the GWMPP by maintaining the current division of labor and data quality as the monitoring program has been efficient and produced quality data. PLPs will monitor primarily wells that they own and some wells owned by other PLPs if those wells are present within the PLP s RI area of investigation. Current access agreements in place between the separate PLPs will be maintained to allow for continued monitoring through Monitoring tasks performed by ABP will include the following: Water level measurements from primarily the ABP wells and some PSC wells as identified in Table 1. ABP interim cleanup action performance monitoring. VI monitoring, as identified in Table 1. VOC and metals plume conditions monitoring for the wells identified in Table 1. MNA monitoring from ABP and PSC wells identified in Table 1. Monitoring tasks performed by BDC will include the following: Water level measurements from primarily the BDC wells and some CI and PSC wells as identified in Table 2. MNA parameter sampling from the BDC wells identified in Table 2 to meet FS data needs. VI monitoring, as identified in Table 2. VOC plume condition monitoring for the wells identified in Table 2. Monitoring tasks performed by CI will include the following: DRAFT W4 GWMPP 2 OCTOBER 17, 2014

4 Water level measurements from primarily the CI wells and some PSC wells as identified in Table 3. MNA monitoring from the CI and PSC wells identified in Table 3. VI monitoring, as identified in Table 3. VOC plume condition monitoring for the wells identified in Table 3. Monitoring tasks performed by PSC in the W4 site will include the following, as previously approved by Ecology: Water level measurements from primarily the PSC wells and some BDC and CI wells as identified in PSC s Revised Engineering Design Report (Amec Geomatrix, 2011). VOCs, 1,4-dioxane, and selective metals monitoring as identified in Attachment 1, which includes excerpts from Tables D-1 and D-2 of the Revised Engineering Design Report (Amec Geomatrix, 2011). STANDARD OPERATING PROCEDURES Each of the four PLPs have developed standard operating procedures (SOPs) for groundwater sampling as described in previous reports. ABP s SOPs are described in Appendix B of their RI Work Plan (Aspect, 2008b); BDC s SOPs are described in Volume 2 of their Revised RI Work Plan (PGG, 2008) and their Revised Groundwater Monitoring Plan (PGG, 2009); CI s SOPs are described their Sampling and Analysis Plan (Farallon, 2010a); and PSC s SOPs are described in Appendix D of their Revised Engineering Design Report (Amec Geomatrix, 2011). The SOPs are compatible and provide procedures for the collection of representative groundwater samples that will produce quality data meeting the W4 FS objectives. The existing SOPs include the following monitoring well maintenance tasks: Well logging, installation, and decommissioning, and in the absence of specific procedures, these tasks will occur in accordance to WAC Descriptions of how and when monitoring wells are inspected and maintained Descriptions of how all monitoring wells are secured Well surveys and datums have been discussed in the existing SOPs. In the past, quality assurance issues arose between different surveys conducted on some W4 monitoring wells. Therefore, if new wells are installed or a resurvey is required, future surveys will use NAVD 88 as a vertical datum and NAD 83 State Plane North as a horizontal datum. City of Seattle monuments 1399 and 1411 will be the benchmarks for future surveys, and the survey vertical and horizontal accuracies will be 0.01 feet and 0.1 feet, respectively. All new surveys will tie into at least two previously surveyed W4 monitoring wells and will be conducted by a State of Washington licensed land surveyor. Existing SOPs address the following aspects of monitoring well sampling: Measuring water levels, well purging, well sampling, and taking field water quality measurements Procedures for managing purge water and other potentially dangerous waste generated DRAFT W4 GWMPP 3 OCTOBER 17, 2014

5 Field record collection during monitoring Sample storage, transport, and COC procedures QUALITY ASSURANCE PROJECT PLAN All four PLPs have developed Quality Assurance Project Plans (QAPPs) for groundwater sample handling as described in previous reports. ABP s QAPP is located in Appendix C of their RI Work Plan (Aspect, 2008b); BDC s QAPP is Volume 2 of its RI Work Plan (PGG, 2008); CI s QAPP is located in Appendix B of their Groundwater Monitoring Plan (Farallon, 2010b); and PSC s QAPP is described in Appendix D of their Revised Engineering Design Report (Amec Geomatrix, 2011). The QAPPs are compatible with each other and with the FS objectives. Though the previously approved W4 QAPPs are similar and compatible, the specified sections of the PSC QAPP as listed below will be used so that a single QAPP will apply to all W4 groundwater samples. In addition, PSC s QAPP is approved by Ecology for current sampling. Sections that will be adopted from the PSC QAPP by the W4 PLPs can be found in Attachment 2 and will include: Section 4 for data quality objectives Section 8 for quality control procedures Subsections 11.0, 11.1, and for data review, verification, and validation Section 12 for data quality assessment As part of the QA program for the W4 GWMPP, all groundwater samples will be analyzed by a Washington-State certified laboratory. REPORTING, DATA DELIVERABLES, AND RECORD STORAGE Monitoring, testing, and analytical data collected will be provided to the Ecology project coordinator in progress reports by each PLP as detailed in Section IV of the AO. Upon receipt of analytical reports and completion of data QA/QC review, data will be reported in the progress reports in either tables or figures. Copies of the QA reports will be appended to the progress reports. Progress reports will occur every 3 months beginning 2 months after the effective date of the AO (April 23, 2014), and therefore every June, September, December, and March. Digital data that will be submitted including monitoring, testing, and analytical data, which will be formatted in accordance with Ecology s instructions and submitted to the Ecology project coordinator. Laboratory reports will be provided to Ecology electronically in this submittal. Site information will be retained using means that are both secure in preserving the written record and accessible in providing access to interested parties. Progress reports will viewable through the W4 public website ( that is maintained as part of the Deliverable Management Plan. Hard copy document repositories will be maintained at the following two locations: DRAFT W4 GWMPP 4 OCTOBER 17, 2014

6 Department of Ecology BE Repository at ActivSpace Luna Park West Northwest Regional Office 3400 Harbor Ave SW, Unit th Ave. SE Seattle, Washington Bellevue, Washington Appointment Contact: (425) REFERENCES Amec Geomatrix, Inc., Revised Engineering Design Report PSC Georgetown Facility. Consultant s report to Burlington Environmental, LLC dated September Aspect Consulting, 2008a. Design Plans and Specifications, and Construstion and Performance Monitoring Plan Art Brass Plating Interim Cleanup Action. Consultant s report to Art Brass Plating, Inc. dated April 1, Aspect Consulting, 2008b. Remedial Investigation Work Plan Art Brass Plating. Consultant s report to Art Brass Plating, Inc. dated September 25, Aspect Consulting, Remedial Investigation Report Art Brass Plating. Consultant s report to Art Brass Plating, Inc. dated September 27, Aspect Consulting, Draft Site Conceptual Model Technical Memorandum. Consultant s report submitted to Department of Ecology dated October 10, Farallon Consulting, 2010a. Sampling and Analysis Plan Plan Capital Industries, Inc. Consultant s report submitted to Capital Industries dated May 19, Farallon Consulting, 2010b. Groundwater Monitoring Plan Capital Industries, Inc. Consultant s report submitted to Capital Industries dated May 19, Farallon Consulting, Revised Draft Remedial Investigation Report Capital Industries, Inc. Consultant s report submitted to Capital Industries dated October Pacific Groundwater Group, Volume 2 Blaser Die Casting Revised Quality Assurance Project Plan. Consultant s report to Blaser Die Casting dated August 7, Pacific Groundwater Group, Blaser Die Casting Revised Groundwater Monitoring Plan. Consultant s report to Blaser Die Casting dated February 29, Pacific Groundwater Group, Blaser Die Casting Revised Remedial Investigation Report. Consultant s report to Blaser Die Casting dated August 2, DRAFT W4 GWMPP 5 OCTOBER 17, 2014

7 ATTACHMENTS Table 1 Table 2 Table 3 Figure 1 Groundwater Monitoring Program 2015/2016, Art Brass Plating Groundwater Monitoring Program 2015/2016, Blaser Die Casting Groundwater Monitoring Program 2015/2016, Capital Industries, Inc. West of Fourth Monitoring Wells Attachment 1 Excerpts of Tables D-1 and D-2 for PSC Monitoring, Amec Geomatrix 2011 Attachment 2 Sections Excerpted from the PSC QAPP (Amec Geomatrix, 2011) Adopted by the West of Fourth Groupa draft gwmpp memo to ecology JK DRAFT W4 GWMPP 6 OCTOBER 17, 2014

8 Table 1 - Groundwater Monitoring Program for 2015/2016, Art Brass Plating March 2015 September 2015 March 2016 September 2016 Monitoring Objectives Semi-Annual Semi-Annual Annual Annual Semi-Annual Annual March 2015 Annual Dissolved Metals (Cd, Cu, Ni, Zn) CVOC CVOC-10mL CVOC CVOC-10mL Dissolved Metals (Cd, Cu, Ni, Zn) MNA CVOC CVOC-10mL Parameters CVOC CVOC-10mL Sample Count Water Table Interval Water Table Interval MW-1 X X X X X X MW-1 X X X MW-2 X X MW-2 X X MW-3 X X X X X X Coordinate sampling event with Art Brass Plating MW-3 X X X X MW-4 X X X X X X MW-4 X X X MW-5 X X X X MW-5 X X MW-6 X X None - Alley ROW MW-6 X X MW-7 X X X X None - 3rd Ave ROW MW-7 X X X X MW-8 X X X X X None - Findlay St ROW MW-8 X X X X X MW-9 X X Contact tenant in 220 Findlay building for access MW-9 X X X MW-10 X X X None - 2nd Ave ROW MW-10 X X X MW-11 X X None - 3rd Ave ROW MW-11 X X MW-12 X X Coordinate sampling event with Art Brass Plating MW-12 X X MW-13 X X Contact tenant in 220 Findlay building for access MW-13 X X MW-14 X X None - Findlay St ROW MW-14 X X X MW-15 X X None - Findlay St ROW MW-15 X X X MW-16 X X None - 2nd Ave ROW MW-16 X X MW-24 X None - Fidalgo St ROW MW-24 X X MW-27 X X None - 3rd Ave ROW MW-27 X X PMW-1 X X X X Coordinate sampling event with Art Brass Plating PMW-1 X X PSC-CG-138-WT None - 2nd Ave ROW (PSC) PSC-CG-138-WT X PSC-CG-142-WT None - Orcas St ROW (PSC) PSC-CG-142-WT X PSC-CG-143-WT None - Lucille St ROW (PSC) PSC-CG-143-WT X Shallow Interval Shallow Interval MW-3-30 X X Coordinate sampling event with Art Brass Plating MW-3-30 X X MW-6-30 None - Alley ROW MW-6-30 X MW-8-30 X X X X X X X None - Findlay St ROW MW-8-30 X X X X MW None - 3rd Ave ROW MW X MW X X X X X X X None - 2nd Ave ROW MW X X X X MW X X X X X After 3pm - Alley ROW next to Alki Bakery MW X X X MW X X X None - Alley ROW MW X X X MW X X X None - 1st Ave ROW MW X X X MW X X X X X Contact CertainTeed Gypsum for access MW X X X MW X X X X X Contact CertainTeed Gypsum for access MW X X X MW X X X X X None - Fidalgo St ROW MW X X X MW X X X X X None - E Marginal Way S ROW MW X X X PSC-CG None - 4th Ave ROW (PSC) PSC-CG X PSC-CG None - 2nd Ave ROW (PSC) PSC-CG X PSC-CG None - Brandon St ROW (PSC) PSC-CG X PSC-CG X None - Fidalgo St ROW (PSC) PSC-CG X X PSC-CG None - Orcas St ROW (PSC) PSC-CG X PSC-CG None - Lucille St ROW (PSC) PSC-CG X PSC-CG None - Ohio Ave ROW (PSC) PSC-CG X PSC-CG None - Ohio Ave ROW (PSC) PSC-CG X PSC-CG X X X X X None - Fidalgo St ROW (PSC) PSC-CG X X X Intermediate Interval Intermediate Interval MW-3-50 None - Findlay St ROW MW-3-50 X MW-8-70 X None - Findlay St ROW MW-8-70 X X MW None - 2nd Ave ROW MW X MW X After 3pm - Alley ROW next to Alki Bakery MW X X MW X X None - Alley ROW MW X X MW None - Alley ROW MW X MW None - Alley ROW MW X MW None - 1st Ave ROW MW X MW None - E Marginal Way S ROW MW X MW None - E Marginal Way S ROW MW X MW X Contact CertainTeed Gypsum for access MW X X MW Contact CertainTeed Gypsum for access MW X MW X None - Fidalgo St ROW MW X X MW X X X None - Mead St ROW MW X X X MW X None - Mead St ROW MW X X MW X X X None - E Marginal Way S ROW MW X X X PSC-CG None - 4th Ave ROW (PSC) PSC-CG X PSC-CG None - 2nd Ave ROW (PSC) PSC-CG X AB-CG None - Fidalgo St ROW AB-CG X AB-CG None - Orcas St ROW AB-CG X Notes CVOC QC Samples collected at these wells MW-4 and MW Metals QC samples will be collected from MW Field parameters will be collected from wells that are sampled for groundwater quality. Parameters will include turbidity, temperature, ph, conductivity, dissolved oxygen, and oxidation/reduction potential. Dissolved metals will be field filtered. CVOC = Chlorinates volatile compounds with standard detection limits by EPA Method 8260B (TCE detection limit=1ug/l). CVOC-10mL = Chlorinated volatile compounds with TCE detection limit of 0.2ug/L. (EPA Method 8260B with 10mL purge) The standard 8260B analysis is proposed for wells that are expected to have high concentrations of TCE. If TCE is not detected at a well with the standard method, samples from that well will be submitted for analysis by 8260B with 10mL purge. Similarly, if samples that are proposed to be analyzed by 8260B-10mL purge have concentrations of TCE significantly exceeding the standard detection limit, samples from the next sampling event will be analyzed by the regular 8260 method. MNA (Monitored Natural Attenuation) Parameters include ferrous iron, ferric iron, and manganese (EPA Method 6010B or 6020); nitrate, nitrite and sulfate (EPA Method 300.0); alkalinity (EPA Method SM2320B); ethane, ethene, and methane (EPA Method 8015B). Dissolved Metals Cadmium, Copper, Nickel, and Zinc by EPA Method (ICP/MS). indicates that the well is tidally influenced. Coordinated Water Levels Interim Action - Source Area Interim Action - Perimeter Vapor Intrusion CVOC Plume Axis & Waterway CVOC Select Plume Boundary MNA Parameters Metals Plume Extent Aspect Consulting 9/25/2014 Table 2 Page 1 of 1

9 Table 2. Groundwater Monitoring Program 2015/2016, Blaser Die Casting Location Name Type Total Depth Screen Interval Screen Length Aquifer Q Q Q Q (feet bgs) (feet bgs) (feet) Interval Mar 15 Sept 15 Mar 16 Sept 16 Existing Wells BDC 1 WT Well to Water Table WL Only C WL Only C X X X BDC 2 WT Well 16 6 to Water Table C A C C C X X X X BDC 3 WT Well 12 7 to 12 5 Water Table C A C C C X X X X BDC 4 WT Well 16 6 to Water Table C C C C X X X BDC 6 WT Well 19 9 to Water Table C A C C C X X X X BDC 11 WT Well to Water Table C C C C X X X CI MW 1 WT Well 17 7 to Water Table WL Only C WL Only C X X CG 136 WT Well to Water Table WL Only C WL Only C X X BDC 3 40 Well to Shallow C A C C C X X X BDC 6 30 Well to Shallow C A C C C X X X BDC Well to Shallow WL Only C WL Only C X X BDC Well to Shallow WL Only C WL Only C X X CI MW 1 40 Well to Shallow WL Only C WL Only C X X CG Well to Shallow WL Only C WL Only C X X BDC 3 60 Well to Intermediate C A C C C X X X BDC 6 60 Well to Intermediate C C C C X X BDC Well to Intermediate WL Only C WL Only C X X BDC Well to Intermediate WL Only C WL Only C X X CI MW 1 60 Well to Intermediate WL Only C WL Only C X X bgs = below ground surface rev 9/30/2014 A Monitored natural attenuation parameters, which include ferrous iron, nitrate, nitrite, sulfate, sulfide, total organic carbon, alkalinity, methane, ethane, ethene, ph, temperature, dissolved oxygen, and oxidation reduction potential.. C HVOCs including trichloroethene, cis 1,2 dichloroethene, trans 1,2 dichloroethene, 1,1 dichloroethene, vinyl chloride, and tetrachloroethene. WL Water Level Measurement Use of existing wells CG 136 WT and CG is contingent on continued access from PSC. Use of existing well CI MW 1 is contingent on continued access from Capital Industries. Water Level Vapor Intrusion Monitoring Objectives MNA Data Needs Plume Centerline Plume Boundary

10 Table 3 Groundwater Monitoring Program 2015/2016, Capital Industries, Inc. Seattle, Washington Farallon PN: Well Details Monitoring and Sampling Details 3 Quarter Quarter Monitoring Objectives Well Identification 1, 2 Total Depth (feet bgs) Screen Interval (feet bgs) Screen Length (feet) Water Level 4 HVOCs 5 MNA 6 Water Level 4 HVOCs 5 Water Table Zone HVOC Select Plume Boundary 7 CI-MW-1-WT to x x x x x MW to x x x x x MW to x x x x x x x MW to x x x x x x x x x MW to x x x x x x x x MW to x x x x x MW to x x x x x x x x x x MW to x x x x x x x CI-9-WT to x x x x x x x x x x CI-10-WT to x x x x x x x x x x CI-11-WT to x x x x x x CI-12-WT to x x x x x x x CI-13-WT to x x x x x x x x CI-14-WT to x x x x x x x x x x CI-16-WT to x x x x x x CI-17-WT to x x x x x x x x x x CI-18-WT to x x x x x x CI-19-WT to x x x x x x CG-137-WT to x x x x x x x x x x CG-141-WT to x x x x x MNA 6 Water Level 4 Vapor Intrusion HVOC Plume Centerline 7 MNA Evaluation 8 1 of 3

11 Table 3 Groundwater Monitoring Program 2015/2016, Capital Industries, Inc. Seattle, Washington Farallon PN: Well Details Monitoring and Sampling Details 3 Quarter Quarter Monitoring Objectives Well Identification 1, 2 Total Depth (feet bgs) Screen Interval (feet bgs) Screen Length (feet) Water Water Level 4 HVOCs 5 MNA 6 Level 4 HVOCs 5 Shallow Zone MNA 6 Water Level 4 Vapor Intrusion HVOC Plume Centerline 7 HVOC Select Plume Boundary 7 CI-MW to x x x x CI to x x x x x x CI to x x x x x x x x CI to x x x x x x x x CI to x x x x x x CI to x x x x x x x x CI to x x x x x x x x CI to x x x x x CI to x x x x x x x x x CI to x x x x x x CI to x x x x x CI to x x x x x CI to x x x x x x x x CI to x x x x x x x x x CG to x x x x x x x x x CG to x x x x x x x x x MNA Evaluation 8 2 of 3

12 Table 3 Groundwater Monitoring Program 2015/2016, Capital Industries, Inc. Seattle, Washington Farallon PN: Well Details Monitoring and Sampling Details 3 Quarter Quarter Monitoring Objectives Well Identification 1, 2 Total Depth (feet bgs) Screen Interval (feet bgs) Screen Length (feet) Water Level 4 HVOCs 5 MNA 6 Water Level 4 HVOCs 5 Intermediate Zone MNA 6 Water Level 4 Vapor Intrusion HVOC Plume Centerline 7 HVOC Select Plume Boundary 7 CI-MW to x x x x CI to x x x x x x x CI to x x x x CI to x x x x x CI to x x x x x x x CI to x x x x x x x CI to x x x x x x x CI to x x x x x CI to x x x x x CI to x x x x x x x x x CI to x x x x x CI to x x x x x x x x x CG to x x x x x x x x x NOTES: 1 Monitoring wells in bold denote the monitoring wells that Capital Industries, Inc. will use for the 2015/2016 groundwater sampling activities 2 Monitoring wells in italics denote monitoring wells that will be sampled by other potentially liable parties (PLPs). Capital Industries, Inc. will use the data from the other PLP sampling events. 3 Groundwater sampling will be conducted semiannually in March and September in conjunction with Blaser Die Casting (BDC) where practicable 4 Water level measurements will be collected in all wells noted above in coordination with the West of 4th PLPs semiannually. Groundwater level measurements will not be collected in Art Brass Plating (ABP) and BDC monitoring wells. 5 HVOCs include tetrachloroethene, trichloroethene, cis-1,2 dichloroethene, trans-1,2 dichloroethene, 1,1 dichloroethene, and vinyl chloride analyzed using U.S. Environmental Protection Agency Method 8260B. 6 MNA parameters include electron receptors, geochemical parameters, and metabolic byproducts to evaluate potential for biodegradation of HVOCs present. MNA parameters will include dissolved oxygen, nitrate, ferric/ferrous iron, manganese (IV)/manganese (II), sulfate, methane, ethane, ethene, ph, temperature, oxidation reduction potential, and total organic carbon. 7 HVOC plume centerline and boundary monitoring wells were selected based on the approximate extent of HVOCs, where detected. Commingled HVOC plumes from other sources exist and difference between the plume centerline and boundaries are not discernible in some areas. 8 MNA evaluation will assist in evaluating biodegradation potential and whether MNA or enhanced MNA alternatives should be considered during the Feasibility Study. bgs = below ground surface CI = Capital Industries, Inc. HVOCs = halogenated volatile organic compounds MNA = monitored natural attenuation MNA Evaluation 8 3 of 3

13 Ohio Ave S CG S Lucile St East Marginal Way S CG CG-143-WT Utah Ave S 1st Ave S S Findlay St ABP-PZ-1 ABP-MW ABP-MW CG CG CG-138-WT ABP-MW-16 ABP-MW ABP-MW nd Ave S ABP-MW-13 ABP-MW-7 ABP-MW-9 3rd Ave S ABP-MW-12 ABP-MW-15 ABP-MW-3 ABP-MW-8 ABP-MW-8-30 ABP-MW-8-70 ABP-MW-27 ABP-MW-6-30 ABP-MW-5 ABP-MW-6 ABP-PMW-1 ABP-MW-2 ABP-MW-1 ABP-MW-4 ABP-MW-14 4th Ave S CG CG Figure 1 West of Fourth Monitoring Wells Blaser Die Casting K:\JANET\JK0504 BlaserDieCasting\GIS\mxds\W4_MonWells.mxd ; 10/6/2014 ABP-MW-24 CG CG ABP-MW ABP-MW ABP-MW ABP-MW ABP-MW ABP-MW CG-142-WT CG CG Site Unit 1 ABP-MW ABP-MW ABP-CG CG CG ABP-MW ABP-MW CG-140-WT CG ABP-CG ABP-MW S Mead St CI-12-WT CI CI ABP-MW ABP-MW ABP-MW CG CG CG-141-WT CI CI ABP-MW BDC-3-60 BDC-3-WT BDC-6-60 BDC-2-WT BDC-3-40 BDC-6-30 ABP-MW CG BDC-6-WT BDC-11-WT ABP-MW BDC CG-136-WT BDC CI-MW-1-WT CI-8-40 CI-MW-5 CI-MW-1-40 CI-8-60 CI-MW-8 CI-MW-1-60 CI-14-WT CI CI S Orcas St S Fidalgo St CI CI CI-10-WT ABP-MW-10 ABP-MW CG-137-WT CG CI-MW-3 CI-MW-2 CI Site Unit 2 ABP-MW-11 ABP-MW BDC-1-WT CI-MW-4 CI-9-WT CI-9-70 CI-9-40 BDC-4-WT CI-MW-7 BDC CI-MW-6 CI-7-60 CI-7-40 BDC CG CG-134-WT CG Monitoring Well Location Well Owner Art Brass Plating Blaser Die Casting Capital Industries PSC Site Unit Boundary Building Footprint Parcel Boundary CI CI-19-WT CI-18-WT CI CI CI-13-WT CI CI CI-11-WT CI CI-17-WT CI CI CI CI-16-WT S Front St Slip 2 1st Ave S Sr 99 Sr 99 5th Ave S 0 Feet 200 K

14 DRAFT W4 GWMPP OCTOBER 17, 2014 ATTACHMENT 1 EXCERPTS OF TABLES D-1 AND D-2 FOR PSC MONITORING, AMEC GEOMATRIX, 2011

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20 DRAFT W4 GWMPP OCTOBER 17, 2014 ATTACHMENT 2 SECTIONS EXCERPTED FROM THE PSC QAPP (AMEC GEOMATRIX, 2011) ADOPTED BY THE WEST OF FOURTH GROUP

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