City of Pomona, Public Works Dept.

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1 CCR/RAP, 822 W. Commercial, Pomona CURRENT CONDITIONS REPORT AND REMEDIAL ACTION PLAN 822 WEST COMMERCIAL STREET POMONA, CALIFORNIA Prepared for: City of Pomona, Public Works Dept. 505 South Garey Avenue Pomona, California Prepared by: SCS ENGINEERS 3900 Kilroy Airport Way, Suite 100 Long Beach, California (562) February 2013 File No

2 CCR/RAP, 822 W. Commercial, Pomona This Current Conditions Report and Remedial Action Plan related to the former Calsol Inc. facility located at 822 West Commercial Street, Pomona, California, dated February 2013 was prepared and reviewed by the following: Kenneth H. Lister, Ph.D., P.G. California CEG #1581, CHg #79 Senior Technical Manager SCS ENGINEERS

3 CCR/RAP, 822 W. Commercial, Pomona Table of Contents Section Page List of Acronyms and Abbreviations... iii Disclaimer... v 1 INTRODUCTION BACKGROUND... 1 Historical Information... 1 Previous Investigations... 2 State Environmental Management Phase I and Phase II SCS Soil Vapor Investigations 2003 to SCS Soil Vapor and Groundwater Investigation SCS Investigation of November 2005 through January Off-Site Groundwater Investigations GEOLOGY AND HYDROGEOLOGY REMEDIAL ACTION OBJECTIVES REMEDIAL ACTION EVALUATION... 6 Impacted Areas and Volumes... 6 Evaluation Process... 6 Development and Description of Alternatives... 8 Evaluation of Alternatives... 8 Selection of Preferred Remedial Action Alternative SOIL REMEDIAL ACTION PLAN Specifications for SVE Soil Vapor Extraction Operations In Situ Chemical Oxidation Enhancement Confirmation of Remedial Action Completion CONCLUSIONS and Recommendations REFERENCES Figures 1 Project Site Location 2 Site Map with Sampling Locations, 822 W. Commercial Street, Pomona, CA 3 Conceptual Site Model, 822 W. Commercial Street, Pomona, CA Tables 1 Soil Vapor Sample Analytical Summary, 822 W. Commercial Street, Pomona, CA 2 Soil Sample Analytical Summary, 822 W. Commercial Street, Pomona, CA 3 Evaluation Summary, Remedial Alternatives, 822 W. Commercial Street, Pomona, CA i

4 CCR/RAP, 822 W. Commercial, Pomona 4 Additional Evaluation, Remedial Alternatives, 822 W. Commercial Street, Pomona, CA Appendices A B Boring Logs Maps of Inferred Subsurface PCE Distribution ii

5 CCR/RAP, 822 W. Commercial, Pomona LIST OF ACRONYMS AND ABBREVIATIONS 1,1-DCE 1,1,1-TCA ARARs bgs CHHSLs COPC DTSC EPA ISCO LADPW MEK MCL mg/kg mg/l MTBE PAH PCB PCE PRG RAO RCRA RWQCB SCS 1,1-Dichloroethene 1,1,1-Trichloroethane Applicable or Relevant and Appropriate Requirements Below ground surface California Human Health Screening Levels Chemicals of Potential Concern Department of Toxic Substance Control U.S. Environmental Protection Agency In Situ Chemical Oxidation Los Angeles Department of Public Works Methyl Ethyl Ketone Maximum contaminant level Milligrams per kilogram Milligrams per liter Methyl Tertiary Butyl Ether Polynuclear aromatic hydrocarbon Polychlorinated biphenyls Tetrachloroethene Preliminary Remediation Goal Remedial Action Objective Resource Conservation and Recovery Act Los Angeles Regional Water Quality Control Board SCS Engineers iii

6 CCR/RAP, 822 W. Commercial, Pomona SCAQMD SSL SVE TBA TCE TPH TPH-g TPH-d TPH-h μg/kg μg/l USCS USGS UST VOCs South Coast Air Quality Management Disrict Soil Screening Level Soil Vapor Extraction Tertiary Butyl Alcohol Trichloroethene Total petroleum hydrocarbons Total petroleum hydrocarbons as gasoline Total petroleum hydrocarbons as diesel Total petroleum hydrocarbons as heavy oils Micrograms per kilogram Micrograms per liter Unified Soil Classification System United States Geological Survey Underground Storage Tank Volatile organic compounds iv

7 CCR/RAP, 822 W. Commercial, Pomona DISCLAIMER This document has been prepared for the City of Pomona, Public Works Department, with application to 822 West Commercial Street, Pomona, California. This report has been prepared in accordance with the care and skill generally exercised by reputable professionals, under similar circumstances, in this or similar localities. No other warranty, either expressed or implied, is made as to the opinions presented herein. Third parties use this report at their own risk. SCS assumes no responsibility for the accuracy of information obtained from information compiled or provided by third-party sources such as regulatory agency listings. v

8 CCR/RAP, 822 W. Commercial, Pomona 1 INTRODUCTION SCS Engineers (SCS) was retained by the City of Pomona, Department of Public Works, to prepare this Current Conditions Report and Remedial Action Plan. This document summarizes the results of environmental investigation and describes corrective actions recommended for soil at the former Calsol Inc. facility, located at 822 West Commercial Street, Pomona, California (the Property ). A map showing the Property location and the surrounding area is provided as Figure 1. The Property, of approximately 1.17 acres, is currently vacant with one small building (footprint approximately 25 by 30 feet) and one larger canopied structure (footprint approximately 40 by 80 feet), both on the southern half of the site. Approximately 30 percent of the Property is open unpaved area and remainder of the site is open and paved. The City of Pomona intends to redevelop the Property. The use will be industrial/commercial and no residential development is intended for the site. This document summarizes environmental investigation data that has been collected for the Property and provides information related to soil remediation that will be conducted. Environmental effort at the Property has been conducted with oversight by the Department of Toxic Substance Control (DTSC). 2 BACKGROUND HISTORICAL INFORMATION Historical records for the Property were previously reviewed at the City of Pomona Building Department and Los Angeles County Department of Public Works (LADPW). Records at the LAPWD indicate numerous installations and removals of aboveground and underground storage tanks (UST) at the former Calsol facility, with some installations as recent as September USTs containing acetone, xylenes, toluene, 2-butanone (also known as methyl ethyl ketone or MEK), isopropanol, gasoline, mineral spirits and other solvents and above ground tanks containing tetrachloroethene (PCE), 1,1,1-trichloroethane (1,1,1-TCA), methylene chloride, kerosene, and diesel fuel are known to have existed at the Property. Hundreds of 55-gallon drums of solvents were also reported to have been stored at various locations on the site by State Environmental Management, Inc. (State, 1997). A database search indicated Calsol was listed as a hazardous waste generator of waste oil, mixed oil, and liquids with halogenated organic compounds greater than 1000 milligrams per liter (mg/l). A 40-gallon spill of a flammable liquid ( CALSOL 1546 ) from a 1,000-gallon UST was reported on February 6, A 100-gallon release of lacquer thinner in 1990 was reported by State (1997). A 1976 accident involving a refuse truck and a train resulted in a spill from an above ground PCE tank. This above ground tank was reported to have been illegally located in violation of City of Pomona Ordinance 2654 and the 1973 Uniform Fire Code. SCS ENGINEERS 1

9 CCR/RAP, 822 W. Commercial, Pomona PREVIOUS INVESTIGATIONS State Environmental Management Phase I and Phase II 1997 State Environmental Management (1999) conducted a soil investigation at the Property in early 1997 that included 9 hand auger borings to 5 or 10 feet bgs and 3 hollow stem auger borings ranging in depth between 41 and 51 feet bgs. Paint thinner like and PCE odors were reported as were field organic vapor meter readings exceeding the maximum readout of the instrument (over 1,000 parts per million by volume). A total of 31 soil samples, ranging in depth to 40 feet bgs, were analyzed. Concentrations of PCE detected in soil samples ranged up to 13,000 milligram per kilogram (mg/kg). 1,1,1-TCA, toluene, xylenes, and other volatile organic compounds (VOCs) were also detected. Historical research conducted for the Phase I portion of the investigation indicated, in addition to the items noted under Historical Information above, numerous drums and above ground tanks of solvents, 9 USTs containing solvent products, an area used for mixing and drumming of solvents, and a 1990 spill of 100 gallons of lacquer thinner from an un-permitted tank. SCS Soil Vapor Investigations 2003 to 2004 In August 2003, SCS oversaw placement of 28 soil vapor borings in the area surrounding the Property and collected samples between depths of 10 to 30 feet below ground surface (bgs). In September 2004, SCS oversaw soil vapor sampling in 27 locations on the Property itself (SCS, 2004c, 2004d). Vapor samples were collected at a depth of 10 feet bgs in all locations and also at a depth of 20 feet in 5 of the locations. Samples were analyzed for VOCs using EPA Method 8260B. The results of soil vapor sample analysis are summarized in Table 1. Sample locations are presented on Figure 2. The results of these soil vapor investigations indicated the presence of a soil vapor plume consisting of several chlorinated VOC species. Concentrations of PCE up to 18,000 micrograms per liter (μg/l) and of 1,1,1-TCA up to 1,800 μg/l were detected in soil vapor. Trichloroethene (TCE), cis-1,2-dichloroethene, and other VOCs, some or all of which may be breakdown products of PCE, were detected as well. SCS Soil Vapor and Groundwater Investigation 2005 In April and May 2005, SCS oversaw additional soil vapor sampling at 12 locations on the Property (SCS, 2005). Vapor samples were collected at 20-, 30- and 40-foot depths. SCS also conducted bulk soil sampling from three soil borings. Selected soil samples were analyzed for total petroleum hydrocarbons (TPH) using EPA Method extended 8015M, VOCs using EPA Method 8260B, and Title 22 Metals using EPA Methods 6010/7000 CAM. Concentrations of PCE up to 6,740 micrograms per kilogram (μg/kg) were detected in soil samples. Also detected was TCE at concentrations up to 628 μg/kg, 1,1,1-TCA at concentrations of up to μg/kg, 1,1-dichloroethene (1,1-DCE) at concentrations up to 45.4 μg/kg, and several other solvents at generally lower concentrations. SCS ENGINEERS 2

10 CCR/RAP, 822 W. Commercial, Pomona In addition, three groundwater monitoring wells (CMW-1, CMW-2, and CMW-3) were installed. In groundwater samples collected in May 2005, PCE was detected in the relatively highest concentrations (up to 1,190 μg/l). In addition, TCE was detected in concentrations up to 703 μg/l, 1,1-DCE at concentrations up to 63.8 μg/l, and several other solvents at generally lower concentrations. SCS Investigation of November 2005 through January 2006 In November 2005 through January 2006, soil sampling and analysis was conducted at the Property. Installation and sampling of two groundwater monitoring wells was also completed. Of the 254 soil samples collected, 145 samples were selected for analysis for VOCs using EPA Method 8260B. The results of soil sample analysis are summarized in Table 2. Sample locations are presented on Figure 2. The most commonly detected VOC species, PCE, was quantified in 141 of the analyzed samples, at concentrations ranging up to 974,000 μg/kg, with the generally highest concentrations of PCE detected in samples from the south central portion of the facility. TCE was detected in 79 of the samples at concentrations ranging up to 32,800 μg/kg. 1,1,1-TCA was detected in 70 samples at concentrations ranging up to 3,220 μg/kg. Other VOCs, detected in a smaller number of samples, included acetone at concentrations up to 108,000 μg/kg, MEK at concentrations up to 31,200 μg/kg, and naphthalene at concentrations up to 60,900 μg/kg. Two shallow (CMW-4, CMW-5) and three deep zone (CMW-1, CMW-2, CMW-3) groundwater monitoring wells are located on the Property (Figure 2). Results of groundwater sample analysis for deep zone on-site wells conducted in November 2012 indicated concentrations of PCE in the range 171 to 470 μg/l and TCE in the range 469 to 642 μg/l. Several other chlorinated VOCs were detected in these wells, including 1,1-DCE. The two shallow zone groundwater monitoring wells on the Property were dry in November 2012 and could not be sampled. Off-Site Groundwater Investigations The initial off-site investigation activities were conducted in October and November This and subsequent investigations through 2012 resulted in sampling groundwater from temporary wells installed in 21 locations. Groundwater samples were analyzed for VOCs by EPA Method 8260B and for 1,4-dioxane using EPA Method 8260SIM. In addition, three off-site groundwater monitoring wells were installed in areas west and southwest of the Property. The data is currently being assessed and a report discussing the off-site groundwater investigation will be prepared in the near future. 3 GEOLOGY AND HYDROGEOLOGY According to the U.S. Geological Survey (USGS), San Dimas (1966, photorevised 1981), California 7.5-minute topographic map, the Property is located at an elevation of approximately 840 to 845 feet above mean sea level. Site topography is generally flat with a slight regional slope to the southwest. SCS ENGINEERS 3

11 CCR/RAP, 822 W. Commercial, Pomona Based on subsurface investigations that have been conducted at the Property, the overall soil column consists predominantly of sand with lesser amounts of gravel and silt (see boring logs reproduced in Appendix A). Some clayey intervals were also encountered during drilling. The upper approximately 20 feet of soil is predominantly fine sandy silt with some silty sand and lesser amounts of sand. Below this, to a depth of approximately 85 to 95 feet, the section consists predominantly of fine to coarse sand with some gravel and occasional sandy silt layers. Below this is a predominantly silty to clayey section with some sand interbeds extending to a depth of approximately 130 feet and, below this, to the deepest section penetrated, lithology consists predominantly of sand with occasional silt and clay beds. Vadoze zone soil impacts have been detected predominantly in the section above approximately 100 feet bgs. The Property is situated in the relatively small Spadra groundwater basin, in an area close to the groundwater divide separating westerly from easterly flow. Easterly flow is towards the Chino groundwater basin and westerly flow within the Spadra basin would eventually lead to the Puente Valley area of the San Gabriel groundwater basin. The principal aquifer in this area is within the older alluvium of Pleistocene age. This unit is overlain by younger alluvium of Holocene age. The younger alluvium varies in thickness from over 100 feet near the mountains, to just a few feet in the south-central portion of the basin. The older alluvium varies in thickness from about 200 feet thick near the southwestern end of the basin to over 1,100 feet thick near the basin center, and averages about 500 feet (Chino Basin Watermaster, July 2005). Predominant recharge to the groundwater reservoirs in the area is from direct percolation of precipitation and infiltration of stream flow within tributaries exiting the surrounding mountains and hills and within the Santa Ana River. Groundwater investigation data from the Property and nearby surrounding areas indicate uppermost groundwater at approximately 90 to 110 feet bgs. This saturated zone is underlain by a predominantly silty section with clay that has apparently allowed this uppermost groundwater to form as a perched zone. Deeper wells on site are screened in a second groundwater zone encountered at approximately 155 to 160 feet bgs. Groundwater flow in the vicinity of the Property in the uppermost groundwater zone appears to be southerly with a gradient of approximately 0.15 feet per foot when last monitored, however this assessment is based on a limited number of data points as discussed in Section 5 below. Regional groundwater flow in the downgradient area west of The Property is, as indicated above, westerly. Groundwater monitoring wells completed in the second groundwater zone at the Property and in the surrounding area also appears to indicate westerly flow. Preliminary results from off-site groundwater investigation indicates that the shallow aquifer does not extend more than approximately 1,000 feet south or southwest of the Property. The area of the deeper aquifer that is impacted by PCE and TCE appears to be located principally in the area immediately west of the Property. 4 REMEDIAL ACTION OBJECTIVES In general, remedial action objectives (RAOs) are statements that identify chemicals of potential concern (COPCs), exposure pathways and receptors, and acceptable contaminant levels. Site- SCS ENGINEERS 4

12 CCR/RAP, 822 W. Commercial, Pomona specific RAOs relate to activities to be conducted in regard to the medium of concern in order to achieve the goal of protecting human health and the environment. Potentially complete exposure pathways of concern include migration of PCE vapors from the subsurface up into occupied enclosed building spaces, should such structures be constructed on the site in the future. Figure 3 presents the conceptual site model for the Property. COPCs at the Property include PCE and other chlorinated VOCs. In addition, in a limited area southwest of the canopied structure, other VOCs have been detected, including ketones and aromatic hydrocarbons such as toluene. Cleanup concentrations for PCE at similar sites have historically been health risk based or have based on protection of groundwater quality. Groundwater at the Property is known to be impacted, so development of health risk based cleanup levels appear to be more appropriate. Development of risk based concentrations includes evaluation of possible migration pathways and potential receptors and determination of estimated exposure point concentrations of COPCs. Potential pathways usually considered for soil VOCs include direct contact (dermal or ingestion) and vapor inhalation. Since physical disturbance of subsurface soils under future Property use scenarios is expected to be minimal, the principal scenario for potential receptor exposure would be one based on vapor inhalation. The most conservative scenario would involve vapor intrusion into an enclosed space, such as a building that might be constructed on the Property. Cleanup levels for PCE, and other toxic VOCs, in soil vapor are normally based on a vapor intrusion scenario. Site specific risk, based on vapor intrusion is dependent on such factors as property use, soil type, foundation type, and building ventilation, in addition to COPC toxicity. As indicated, the future use of the Property will be industrial or commercial and not residential. Soil type in the upper ten feet at the Property is predominantly silt with some sandy silt and silty sand. Based on previous sampling, vapor phase COPCs have been detected at relatively high concentrations in 10-foot depth and deeper samples. COPCs have also been detected in bulk soil samples. Depending on practically achievable cleanup levels, it may be prudent to include engineering controls for vapor protection, such as impermeable membranes, in future building plans. Screening levels for indoor air intrusion of soil contaminants have been developed by various agencies, most based on the Johnson and Ettinger model of vapor migration. For instance, the California Environmental Protection Agency has developed California Human Health Screening Levels (CHHSLs) that can be used to help evaluate contaminated properties. The U.S. Environmental Protection Agency (EPA) has also developed tools that can provide screening target concentrations for soil vapor (for instance, Although soil vapor concentrations developed by the State and other agencies are not meant to represent clean up levels, they can provide some guidance in regard to concentrations that are conservatively protective of human health in the absence of engineering controls. For instance, the California soil gas CHHSL for PCE below buildings constructed with engineered fill below sub-slab gravel, under a commercial/industrial scenario is 1.6 ug/l (California EPA Office of Environmental Health Hazard Assessment, 2010 update). Although SCS ENGINEERS 5

13 CCR/RAP, 822 W. Commercial, Pomona this concentration, or some other site specific number may be used as a target, all remediation technologies have limitations and actual cleanup values are likely to be based on subsurface concentrations that are ultimately achievable rather than on theoretical targets. 5 REMEDIAL ACTION EVALUATION IMPACTED AREAS AND VOLUMES The goal of remedial action evaluation is to develop scenarios that have the potential for meeting RAOs and then assessing the relative merits of these alternatives. The soil area with the greatest VOC impacts is in the southeastern quadrant of the Property, the apparent location of the historical above ground PCE tank spill. Contour maps of inferred vapor concentrations at depths down to 40 feet bgs are included in Appendix B. Soil vapor data at the Property is limited to these depths down, but results of bulk soil sample analysis indicates that elevated concentrations of VOCs extend to approximately 100 feet bgs in the vadose zone. Preliminary estimates of VOCs in place at the Property to a depth of 100 feet, based on sample data, are approximately 100 pounds in the vapor phase and approximately 450 pounds adsorbed to soil particles. Volume of soil that is significantly impacted is estimated at approximately 50,000 cubic yards. EVALUATION PROCESS The process of development and screening of remediation alternatives may be viewed conceptually as occurring in several phases: Identification of Impacted Areas and Volumes Definition of areas and volumes to be remediated is necessary for full evaluation of alternatives as discussed above. Identification and Evaluation of Technologies Applicable technologies are identified and evaluated. Inappropriate technologies are screened out. Assembly of Technologies into Alternatives Remedial alternatives are developed from applicable technologies. Screening of Alternatives Alternatives are evaluated on a general basis to determine effectiveness, implementability, and cost. Those alternatives not screened out are selected for detailed analysis as described below. In the current document, the process of identification and evaluation of technologies, assembly into alternatives, and screening of alternatives has been combined. Evaluation of Alternatives Alternatives are evaluated, as described below. Identified remedial action alternatives are evaluated initially based on effectiveness, implementability, and cost, as follows: SCS ENGINEERS 6

14 CCR/RAP, 822 W. Commercial, Pomona Effectiveness This criterion focuses on the degree to which a remedial action reduces toxicity, mobility, and volume; minimizes residual risk; affords long term protection of human health and the environment; minimizes short term impacts; and how quickly it achieves protection. Implementability Remedial actions are evaluated with respect to technical and administrative applicability to site conditions. Implementability includes such items as regulatory approval, ability to obtain necessary permits, and availability of resources such as labor and equipment. Cost Relative cost of alternatives, including capital and operations and maintenance expenses, are evaluated. Actual costs will be influenced by a number of factors, including labor and material cost, competitive market conditions, final project scope, and the implementation schedule. In addition, alternatives can be evaluated with regard to the following criteria: Short-term effectiveness, which evaluates the effects of the remedial alternative during the construction and implementation phases such as the risk of exposure of workers and community during remedial activities, and environmental impacts that result from implementing the action. Long-term effectiveness, which addresses issues related to management of residual risk remaining after the remedial action has been performed. The primary focus is on controls that may be required to manage risk posed by treatment residuals and/or untreated wastes. Reduction of toxicity, mobility, or volume, which evaluates the alternatives ability to reduce these factors. Compliance with applicable or relevant and appropriate requirements (ARARs), which evaluates the alternative s ability to comply with chemical-, action-, and location-specific laws and regulations. Overall protection of human health and the environment, which evaluates overall protectiveness of the remedy and provides adequate short and long term protection to human health and the environment. Regulatory acceptance, which considers the likelihood that the alternative will be acceptable to regulatory agencies involved. Community acceptance, which considers the potential for agreement or opposition by members of the community to the remedial alternative. SCS ENGINEERS 7

15 CCR/RAP, 822 W. Commercial, Pomona DEVELOPMENT AND DESCRIPTION OF ALTERNATIVES Given the COPCs identified at the Property, technologies that are practically applicable to vadose zone soils at the Property are as follows: Soil Vapor Extraction (SVE). This technology, in which air is drawn into and passes through the soil to remove vapor phase VOCs and to strip these substances from the surface of soil particles. The air stream is then extracted and treated. SVE can be used in situ or ex situ. Soil Excavation. This technology would be used in connection with either on-site treatment or off-site treatment and/or disposal. Vapor treatment. Carbon adsorption is the most widely used treatment for extracted vapor containing the set of COPCs found at the Property. Chemical Oxidation. Chemical oxidation uses reagents to transform, degrade, or immobilize COPCs. Addition of a chemical agent that releases oxygen in the subsurface may be applicable as an enhancement in connection with other technologies being considered. Transportation and Off-Site Soil Disposal. Use of (generally) conventional equipment to transport soil off site to a licensed facility for treatment/reuse or disposal. Of these, ex situ SVE and other onsite ex situ soil treatment can be screened out due to community concerns and space limitations. The remaining technologies have been assembled into the following remedial action alternatives for vadose zone soil: Soil Excavation and Off-site Treatment and/or Disposal. In Situ SVE. Extraction would be combined with carbon adsorption treatment of extracted vapor. In Situ SVE Combined with Chemical Oxidation. Chemical oxidation is considered for possible use in conjunction with SVE. In addition, per EPA guidelines, a No Action alternative will be considered for comparative purposes. EVALUATION OF ALTERNATIVES The initial evaluation of the four alternatives listed above is summarized in Table 3. The significant drawbacks to Soil Excavation and Off-site Treatment or Disposal, are high cost and the barriers to excavating to the full depth of impacted soil using conventional excavation SCS ENGINEERS 8

16 CCR/RAP, 822 W. Commercial, Pomona equipment. Although targeted hot spot excavation could be used in conjunction with other remediation technologies, shoring would still be necessary on portions of the Property where soil impacts are deep. Even with shoring, depth limitations are likely to prevent removal of COPC impacts below approximately 40 feet bgs. Unconventional excavation techniques, such use of deep borings to remove soil, may allow access to soil otherwise unreachable, but at a significant increase in cost. In addition, implementability issues could arise from the need to transport significant quantities of soil through surrounding neighborhoods. SVE is considered by EPA a proven technology for the COPCs found in vadose zone soils on the Property. SVE has been used effectively in the southern California at hundreds of VOC contamination sites and the relatively coarse grained, low moisture soil that predominates on the Property below approximately 10 feet is considered favorable. It has the further advantage of being moderate in cost and minimizing disruption to surrounding areas. Chemical Oxidation, used in conjunction with SVE, may be useful to speed up the cleanup in soil areas of relatively high concentration, however, at significant added cost. Subsurface injection of a strong oxidizer, such as hydrogen peroxide, has been used at similar sites to chemically degrade PCE and other chlorinated hydrocarbons. Implementability issues include the necessity of further testing prior to design of the remediation. The No Action alternative would prove ineffective and is unlikely to be acceptable to regulatory agencies. Table 4 includes an evaluation summary of alternatives against some of the other criteria listed above. SELECTION OF PREFERRED REMEDIAL ACTION ALTERNATIVE SVE with carbon adsorption treatment of off-gas vapors is the preferred alternative soil remediation for the Property. Since site specific testing of SVE has not been conducted, it is recommended that the initial phase of remedial action implementation include installation of a portion of the system described below, for use in pilot testing, prior to installation of the full SVE and treatment train. It is also recommended that further evaluation be conducted of in situ chemical oxidation as an enhancement to SVE targeting the volume of soil with the highest concentrations of PCE, located in the vicinity of boring CB9, and vapor sampling point CSV11, to a depth of approximately 30 feet bgs. Preliminary evaluation should include a detailed estimate of potential added costs and an estimate of remediation time that can be saved. Full evaluation of chemical oxidation is anticipated to require bench and pilot testing. SCS ENGINEERS 9

17 CCR/RAP, 822 W. Commercial, Pomona 6 SOIL REMEDIAL ACTION PLAN SPECIFICATIONS FOR SVE Although specifics will be determined based on the results of recommended pilot testing, what is known of site conditions make it likely that the SVE design will include the following elements: Installation and use of estimated 2-inch diameter wells as vapor extraction points at an approximately 12 locations (based on an estimated radius of influence of 35 feet). These wells would be screened between depths of approximately 10 and 25 feet bgs to address COPCs in the shallower soil zone on the Property. Installation and us of estimated 2-inch diameter dual nested wells as vapor extraction points at approximately 5 locations (based on an estimated radius of influence of at least 40 feet). These wells would be screened between depths of approximately 30 to 50 and 55 to 85 feet bgs to address COPCs in the intermediate and deeper soil zones on the Property. Use of the 1-inch diameter wells as vapor monitoring/air bleed points screened in the same three depth intervals as the extraction wells. These would be installed principally at the margins of the impacted zones. It is estimated that 18 of these would be installed in each depth zone. Mobilization to the Property of a blower capable of a minimum of 1,000 scfm for vapor extraction. Use of a moisture separator capable of handling the flows indicated above. Use of two, minimum 2,000-pound, carbon canisters to treat extracted PCE and other VOC vapors. The extraction/treatment system will include sampling ports to monitor flow and vapor concentrations and valving to control adjustment of extraction. The system will be fitted with flow meters and pressure/vacuum gauges, as appropriate. The SVE system will require permitting with the South Coast Air Quality Management District (SCAQMD) for the duration of the remediation. It is recommended that the SVE system be installed in two phases, with pilot testing following the first phase of installation. Pilot testing will be used to further assess radius of influence and to confirm that the treatment system will be appropriately sized to handle the air flow and concentrations of COPCs in the extracted vapor stream. The recommended initial phase of SVE installation is envisioned to consist of the following elements: SCS ENGINEERS 10

18 CCR/RAP, 822 W. Commercial, Pomona Drill/install one each 2-inch diameter vapor extraction wells to depths of approximately 25, 50, and 85 feet bgs (screened as described above) in a location or locations in the south central portion of the Property (in the vicinity of previous sampling points CB2, CSV12, and CSV34). Install 1-inch diameter nested vapor monitoring wells in three locations at lateral distances of approximately 20, 40, and 60 feet from the vapor extraction wells (three wells in each depth zone screened as described above). Mobilize extraction and treatment equipment (various locations SCAQMD permitted) to the site capable of extracting at up to 250 scfm and conduct pilot testings. Testing will take place during an estimated 3 to 5 days and should include extraction from individual wells, plus all three wells simultaneously, using at least three different flow rates and vacuums. Testing to include periodic collection of field readings and vapor samples. Field testing parameters to be measured and recorded and include, at a minimum, extraction flow rate, vacuum at extraction and monitoring wells, field VOC concentration at extraction and monitoring wells, and time of measurement and duration of each testing period. Conduct laboratory analysis of vapor samples using EPA Method 8260 or equivalent. Prepare summary report of field test results. This report will describe any recommended modifications for the full-scale SVE system plus a detailed operations and monitoring plan. Following approval by the City and DTSC, the full scale system should be installed and started up, as outlined below. SOIL VAPOR EXTRACTION OPERATIONS Startup activities will include balancing the vapor extraction wells to maximize the PCE recovery rate. Balancing consists of iterative adjustments to flow from shallow and deep zones to achieve optimal PCE concentrations while preventing short-circuiting. Field monitoring will include the following: VOC concentrations at each of the extraction and monitoring wells. VOC concentrations at the inlet and outlet of the vapor treatment unit. Vapor flow from each of the extraction wells and the system as a whole. Vacuum measurements from the extraction and monitoring wells. During the initial balancing phase, estimated to require approximately two weeks, the system may be monitored and adjusted daily or every other day. Samples of the treatment system inlet and outlet will also be collected for laboratory analysis using EPA Method 8260B or equivalent. SCS ENGINEERS 11

19 CCR/RAP, 822 W. Commercial, Pomona During this phase samples are expected to be collected for laboratory analysis, at a minimum, shortly after initial startup, after two to three days of operation, and at the end of the balancing phase. After the balancing phase, and dependant on results, the interval between field monitoring episodes may possibly be lengthened to once per week. Weekly measurements will include field measurements of flow and concentrations at individual extraction wells and measurement of vacuum at the extraction and monitoring wells. Field monitoring data will be recorded on site specific data sheets. In addition, it is anticipated that vapor samples will be collected for laboratory analysis on a monthly basis from the inlet and outlet of the treatment system. Additional samples for laboratory analysis may be collected to monitor system performance, as warranted. IN SITU CHEMICAL OXIDATION ENHANCEMENT In situ chemical oxidation (ISCO) is proposed as a possible enhancement to the preferred alternative for use in shortening the overall remediation time frame by targeting hot spot areas of contamination. Prior to moving ahead with this enhancement, a detailed cost analysis should be presented to the City. If it is determined, based on the likely benefits and the cost analysis, that the enhancement should proceed, bench testing should initially be conducted. Bench testing is expected to involve collection of bulk soil samples and testing of these samples, by individuals experienced these procedures, to determine whether ISCO is feasible and results in significant and rapid mass reduction of contaminants and, if so, what chemical oxidant yields optimal results. If bench testing is successful, pilot testing, consisting of installation of a small number of on-site injection points and introduction of chemical oxidant to the subsurface, should be conducted. Based on pilot testing, final feasibility will be determined as well as (if ISCO is determined to be feasible) optimal injection (and monitoring) point depth and spacing, injection volumes, and concentrations. It will also be necessary to make a final determination regarding the cost and projected time frame for hot spot remediation using ISCO. Results, time projections, ISCO design, and an operations and monitoring plan would then need to be provided, in the form of a RAP amendment, to the City and to DTSC for approval CONFIRMATION OF REMEDIAL ACTION COMPLETION As is the case with any remediation technology, closure criteria must be based on subsurface concentrations that are ultimately achievable. In general, after removing a significant mass of contaminants early in their operation, SVE systems reach a limiting point at which VOCs are being removed at only a relatively slow rate and the reduction in vapor concentrations has tapered off with time. This point is signaled by a flattening of the curve of extracted vapor concentration plotted against time since operation began. When the concentration-time curve reaches these asymptotic levels it is standard practice to conduct rebound testing during which the system is shut down for a time and then restarted. If concentrations after restart rebound to SCS ENGINEERS 12

20 CCR/RAP, 822 W. Commercial, Pomona significantly higher levels it indicates that desorption of VOCs from soil grains is rate limited and additional vapor extraction may be warranted, possibly in a pulsed mode. If there is no significant rebound it is likely that the practical limits of the cleanup have been reached. To conduct the rebound test, the SVE system will be shut down to allow soil vapor concentrations in soil and soil vapor to equilibrate. Shut down time is estimated to be one to three weeks. SVE will then be restarted and soil vapor samples from the system will be collected for analysis of VOCs by field instruments and in the laboratory. If concentrations immediately after system restart rise to two to three or more times pre-shutdown concentrations, it is likely that SVE operation will need to continue. Even if concentrations immediately after system restart increase, if cleanup is close to being complete, concentrations will tend to return to asymptotic values relatively quickly. In this case, a series of rebound tests will be conducted, with several weeks between each test, until it has been determined that the practical limits of contaminant removal have been reached. Evaluation of the results of the ISCO enhancement, if employed at the Property, would also be conducted. Details regarding methods of evaluation and determination of completion of remediation in this regard would be included in a Remedial Action Plan amendment to be prepared at the end of ISCO pilot testing. 7 CONCLUSIONS AND RECOMMENDATIONS Results of subsurface investigation at the Property have indicated soil impacts due to PCE and other VOCs. Remedial action, consisting of in situ SVE with treatment of off gas by carbon adsorption is recommended. Investigation, including bench and pilot testing, aimed at possible enhancement to the remedial alternative using ISCO, is also recommended. SCS ENGINEERS 13

21 CCR/RAP, 822 W. Commercial, Pomona 7 REFERENCES California Department of Toxic Substances Control/California Regional Water Quality Control Board, Los Angeles (January 13). Advisory Active Soil Gas Investigations. Chino Basin Watermaster (July). Advisory Optimum Basin Management Program, State of the Basin Report 2004, prepared by Wildermuth Environmental Inc. SCS Engineers. 2004a (June). Site Investigation Workplan, Calsol Inc. Facility, 123, 145, and 165 North Hamilton Blvd., Pomona, California. SCS Engineers. 2004b (June). Health and Safety Plan for Soil Sampling and Groundwater Monitoring Well Installation Activities, Calsol Inc. Facility, 123, 145, and 165 North Hamilton Blvd., Pomona, California. SCS Engineers. 2004c (September). Site Investigation Report, Redevelopment Agency Parcel, 198 North Hamilton Boulevard, Pomona, California. SCS Engineers. 2004d (October). Site Investigation Report, Calsol Inc. Facility, 123, 145, and 165 North Hamilton Blvd., Pomona, California. SCS Engineers (July). Additional Site Investigation Report, Calsol Inc. Facility, 123, 145, and 165 North Hamilton Blvd., Pomona, California. SCS Engineers (May). Off-Site Groundwater Investigation Workplan, Calsol Inc. Facility, 123, 145, and 165 North Hamilton Blvd., Pomona, California. SCS Engineers (January). Off-Site Groundwater Investigation Report, Calsol Inc. Facility, 123, 145, and 165 North Hamilton Blvd., Pomona, California. SCS Engineers (July 2). Off-Site Groundwater Investigation Workplan Addendum, Calsol Inc. Facility, 123, 145, and 165 North Hamilton Blvd., Pomona, California. SCS Engineers (October 14). Off-Site Groundwater Investigation Workplan Addendum, Second Round Groundwater Samples from Boreholes, Calsol Inc. Facility, 123, 145, and 165 North Hamilton Blvd., Pomona, California. State Environmental Management, Inc (February 12). Phase I and II Environmental Assessment, Calsol, 123 N. Hamilton Blvd., Pomona, California. Marked Draft. United States Environmental Protection Agency (US EPA) Region 9 Laboratory (September). Field Sampling Guidance Document #1220, Groundwater Well Sampling. United States Geological Survey San Dimas, CA 7.5 Minute Topographic Map, (Photorevised 1981). SCS ENGINEERS 14

22 CCR/RAP, 822 W. Commercial, Pomona FIGURES

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26 CCR/RAP, 822 W. Commercial, Pomona TABLES

27 TABLE 1 Soil Vapor Analytical Summary 822 W. Commercial St., Pomona, CA EPA Method 8260B Sample ID Depth (feet bgs) Date Sampled 1,1-Dichloroethene (1,1-DCE) 1,1-Dichloroethane (1,1-DCA) cis-1,2-dichloroethene (cis-1,2-dce) 1,1,1-Trichloroethane (1,1,1-TCA) Trichloroethene (TCE) Toluene Tetrachloroethene (PCE) 1,1,1,2- Tetrachloroethane Chloroform Freon 113 CSV1-10 (1 volume) 10 9/28/ < < CSV1-10 (3 volumes) 10 9/28/ < <10 <10 <10 CSV1-10 (7 volumes) 10 9/28/ < <10 <10 <10 CSV /28/ <10 < < <10 <10 <10 CSV2-10 duplicate 10 9/28/ <10 < < <10 <10 21 CSV /28/ <10 < < <10 <10 20 µg/l CSV /28/ <10 < < <10 <10 21 CSV /28/ <10 < < <10 <10 14 CSV /28/ <10 < < <10 <10 14 CSV /28/ <10 < < <10 <10 16 CSV /28/ <10 < < <10 <10 14 CSV /28/2004 < < <10 <10 14 CSV /28/2004 <10 <10 < < <10 <10 12 CSV /28/2004 <10 <10 < < <10 18 CSV /28/ < < <10 <10 20 CSV /28/ <10 < < <10 <10 19 CSV /28/ <10 < < <10 <10 19 CSV /28/ <10 < < <10 <10 16 CSV /28/ <10 < < <10 <10 16 CSV /28/ <10 < < <10 <10 17 CSV /29/ <10 < < <10 <10 <10 CSV /29/ <10 < < <10 <10 <10 CSV19-10 duplicate 10 9/29/ <10 < < <10 <10 <10 Page 1 of 3

28 TABLE 1 Soil Vapor Analytical Summary 822 W. Commercial St., Pomona, CA EPA Method 8260B Sample ID Depth (feet bgs) Date Sampled 1,1-Dichloroethene (1,1-DCE) 1,1-Dichloroethane (1,1-DCA) cis-1,2-dichloroethene (cis-1,2-dce) 1,1,1-Trichloroethane (1,1,1-TCA) Trichloroethene (TCE) Toluene Tetrachloroethene (PCE) 1,1,1,2- Tetrachloroethane Chloroform Freon 113 µg/l CSV /29/2004 <10 <10 <10 <10 <10 < <10 <10 <10 CSV /29/ <10 < < <10 <10 <10 CSV /29/ <10 < < <10 <10 <10 CSV /29/ <10 < < <10 <10 23 CSV /29/ <10 < < <10 <10 19 CSV /29/ <10 < < <10 <10 22 CSV /29/ <10 < < <10 <10 22 CSV /29/ <10 < < <10 <10 18 CSV /29/ <10 < < <10 <10 21 CSV /29/ <10 <10 <10 28 < <10 <10 17 CSV /29/ <10 < < <10 <10 20 CSV /29/2004 <10 <10 <10 <10 13 < <10 <10 18 CSV /29/ <10 < < <10 <10 20 CSV /28/ <2.0 < < <2.0 <2.0 <2.0 CSV /28/ <20 < < <20 <20 <20 CSV /28/ <1.0 < < <1.0 <1.0 <1.0 CSV /28/ <10 < < <10 <10 <10 CSV /28/ <4.0 < < <4.0 <4.0 <4.0 CSV /28/ <20 < < <20 <20 <20 CSV /28/ <20 < < <20 <20 <20 CSV31-40 duplicate 40 4/28/ <20 < < <20 <20 <20 Page 2 of 3

29 TABLE 1 Soil Vapor Analytical Summary 822 W. Commercial St., Pomona, CA EPA Method 8260B Sample ID Depth (feet bgs) Date Sampled 1,1-Dichloroethene (1,1-DCE) 1,1-Dichloroethane (1,1-DCA) cis-1,2-dichloroethene (cis-1,2-dce) 1,1,1-Trichloroethane (1,1,1-TCA) Trichloroethene (TCE) Toluene Tetrachloroethene (PCE) 1,1,1,2- Tetrachloroethane Chloroform Freon 113 µg/l CSV /28/ <2.0 < < <2.0 < CSV /28/ <40 < < <40 <40 <40 CSV /28/2005 <100 <100 <100 <100 <100 < <100 <100 <100 CSV /28/2005 <200 <200 <200 <200 <200 < <200 <200 <200 CSV /28/2005 <200 <200 <200 < < <200 <200 <200 CSV /28/2005 <100 <100 <100 < < <100 <100 <100 CSV /28/2005 <200 <200 <200 < < <200 <200 <200 CSV /29/ <1.0 < < <1.0 <1.0 <1.0 CSV /29/ <10 < < <10 <10 <10 CSV /29/ <10 < < <10 <10 <10 CSV /29/ <10 < < <10 <10 <10 CSV /29/2005 < < <20 <20 <20 CSV /29/2005 <100 < < <100 <100 <100 CSV /29/2005 <10 < <10 < <10 <10 <10 CSV /29/2005 <40 <40 < <40 < <40 <40 <40 CSV /29/ <2.0 < < <2.0 <2.0 <2.0 CSV /29/ <20 <20 41 <20 < <20 <20 <20 CSV39-30 duplicate 30 4/29/ <20 <20 44 <20 < <20 <20 <20 CSV /29/2005 <20 <20 <20 <20 <20 < <20 <20 <20 CSV /29/2005 <400 <400 <400 <400 <400 < <400 <400 <400 µg/l = micrograms per liter bgs = below ground surface Page 3 of 3

30 TABLE 2A Soil Sample Analytical Summary 822 W. Commercial St., Pomona, CA Sample Location Sample Depth (feet bgs) Date of Collection Benzene 1,1-Dichloroethane (1,1-DCA) 1,1-Dichloroethene (1,1-DCE) cis-1,2-dichloroethene (cis-1,2-dce) Ethylbenzene Volatile Organic Compounds (VOCs) EPA Method 8260B/ /2/2005 <2.0 <5.0 <5.0 <5.0 <2.0 < <2.0 <5.0 <5.0 <5.0 <2.0 <2.0 < /2/2005 <2.0 <5.0 <5.0 <5.0 <2.0 < <2.0 <5.0 <5.0 <5.0 <2.0 <2.0 < /2/2005 <2.0 <5.0 <5.0 <5.0 <2.0 < <2.0 <5.0 <5.0 <5.0 <2.0 <2.0 < /2/2005 <2.0 <5.0 <5.0 <5.0 <2.0 < < J < J <2.0 <2.0 < /2/2005 <2.0 <5.0 <5.0 <5.0 <2.0 < <2.0 <5.0 <5.0 <5.0 <2.0 <2.0 <20 CB /2/2005 <2.0 <5.0 <5.0 <5.0 <2.0 < < < <2.0 <2.0 < /2/2005 <2.0 <5.0 <5.0 <5.0 <2.0 < <2.0 <5.0 <5.0 <5.0 <2.0 <2.0 < /2/2005 <2.0 < J <5.0 <2.0 < < < <2.0 <2.0 < /2/2005 <2.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <2.0 <5.0 <5.0 <5.0 <2.0 <2.0 < /2/ J 5.8J 28.4 < J 7.9J 1780 < J 399 <2.0 <2.0 < /2/2005 <2.0 <5.0 <5.0 <5.0 <2.0 < J 7.7J < <2.0 <2.0 < /2/ J <5.0 <5.0 <5.0 <2.0 < J <5.0 <5.0 <5.0 <2.0 <2.0 < /2/ J <5.0 <5.0 <5.0 <2.0 < <2.0 <5.0 <5.0 <5.0 <2.0 <2.0 < /2/ J <5.0 <5.0 <5.0 < J 8.3J < J 5.1J 35.2J 55 5/2/2005 <2.0 <5.0 <5.0 <5.0 <2.0 < <2.0 <5.0 < J <2.0 < J CB /3/2005 <2.0 <5.0 <5.0 <5.0 <2.0 < <2.0 <5.0 <5.0 <5.0 <2.0 <2.0 < /3/2005 <2.0 <5.0 <5.0 <5.0 <2.0 < <2.0 <5.0 <5.0 <5.0 <2.0 <2.0 < /3/2005 <2.0 <5.0 <5.0 <5.0 <2.0 < < J < <2.0 <2.0 < /3/2005 <2.0 < <5.0 < < J 120 <2.0 <2.0 < /3/2005 < J < J <2.0 < J 100 5/3/2005 <2.0 <5.0 <5.0 <5.0 <2.0 < < J < <2.0 <2.0 < /3/2005 <2.0 <5.0 <5.0 <5.0 <2.0 < <2.0 <5.0 < J <2.0 <2.0 < /3/2005 <2.0 <5.0 <5.0 <5.0 <2.0 < <2.0 <5.0 <5.0 <5.0 <2.0 <2.0 < /3/2005 <2.0 <5.0 <5.0 <5.0 <2.0 < <2.0 <5.0 <5.0 <5.0 <2.0 <2.0 < /3/2005 <2.0 <5.0 <5.0 <5.0 <2.0 < <2.0 <5.0 <5.0 <5.0 <2.0 <2.0 < /3/2005 <2.0 <5.0 <5.0 <5.0 <2.0 < <2.0 <5.0 <5.0 <5.0 <2.0 <2.0 <20 CB /3/2005 <2.0 <5.0 <5.0 <5.0 <2.0 < < J < <2.0 <2.0 < /3/2005 <2.0 <5.0 <5.0 <5.0 <2.0 < <2.0 <5.0 <5.0 <5.0 <2.0 <2.0 < /3/2005 <2.0 < J <5.0 < J 363 < < <2.0 <2.0 < /3/2005 <2.0 <5.0 <5.0 <5.0 <2.0 < < < <2.0 <2.0 < /3/2005 <2.0 <5.0 <5.0 <5.0 <2.0 < <2.0 <5.0 <5.0 <5.0 <2.0 <2.0 < /3/2005 <2.0 < <5.0 < J 5130 < J < <2.0 <2.0 < /3/2005 <2.0 < J <5.0 <2.0 < <2.0 <5.0 < <2.0 <2.0 <20 Notes: Only analytes detected in one or more samples are listed. µg/kg = micrograms per kilogram (or parts per billion) ND = Not Detected ** Background concentrations ranges, in mg/kg, from Bradford, et.al., ,1,1,2-Tetrachloroethane Tetrachloroethene (PCE) Toluene µg/kg 1,1,1-Trichloroethane (1,1,1-TCA) 1,1,2-Trichloroethane (1,1,2-TCA) Trichloroethene (TCE) o-xylenes m,p-xylenes tert-butyl alcohol (TBA)

31 TABLE 2B Soil Samples Analytical Summary 822 W. Commercial St., Pomona, CA Volatile Organic Compounds (VOCs) EPA Method 8260B/5035 Sample Location Sample Number Sample Depth (feet bgs) Date of Collection Acetone 2-Butanone (MEK) Benzene Bromodichloromethane sec-butylbenzene tert-butylbenzene Chlorobenzene Chloroform (Trichloromethane) 1,1-Dichloroethane (1,1-DCA) 1,2-Dichloroethane (DCE) 1,1-Dichloroethene (1,1-DCE) cis-1,2-dichloroethene (cis-1,2-dce) trans-1,2-dichloroethene Ethylbenzene Isopropylbenzene p-isopropyltoluene 4-Methyl - 2-Pentonone (MIBK) Naphalene n-propylbenzene Styrene 1,1,1,2-Tetrachloroethane Tetrachloroethene (PCE) Toluene 1,1,1-Trichloroethane (1,1,1-TCA) 1,1,2-Trichloroethane (1,1,2-TCA) Trichloroethene (TCE) 1,2,4 - Trimethylbenzene 1,3,5-Trimethylbenzene o-xylenes m,p-xylenes tert-butyl alcohol (TBA) Ethyl alcohol (Ethanol) CB4 CB5 CB6 CB7 CB8 CB9 CB /9/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 < <5.0 < <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < < < <5.0 <5.0 <2.0 <2.0 <20 <100 CB /9/ , <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 < <5.0 <2.0 <5.0 < <5.0 <5.0 < <5.0 < J < J 12.4J 229J <100 CB /9/ , <2.0 <5.0 <5.0 <5.0 <5.0 < J <5.0 < < J <5.0 < <5.0 <5.0 < < J < <100 CB /9/ <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 < <5.0 <5.0 < J 5.4J <5.0 <5.0 <5.0 <5.0 <2.0 < J <100 CB /9/ , <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 < J <5.0 < <5.0 <5.0 < <5.0 <5.0 <5.0 < J 14.4J 90.1J <100 CB /9/ , <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 < J <5.0 <5.0 < <5.0 <5.0 <5.0 < J 4.3J <20 <100 CB /9/ <25 <2.0 <5.0 <5.0 <5.0 <5.0 < J < J <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < J 85.9 < <5.0 <5.0 <2.0 <2.0 <20 <100 CB /9/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < <2.0 <5.0 < J <5.0 <5.0 <2.0 <2.0 <20 <100 CB /9/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 < <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < <2.0 < J 84.6 <5.0 <5.0 <2.0 <2.0 <20 <100 CB /10/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <2.0 <20 <100 CB /10/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < <2.0 <5.0 < J <5.0 <5.0 <2.0 <2.0 <20 <100 CB /11/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <2.0 <20 <100 CB /11/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <2.0 <20 <100 CB /11/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < J <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <2.0 <20 <100 CB /11/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < < J <5.0 <5.0 <5.0 <5.0 <2.0 <2.0 <20 <100 CB /11/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 < J <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < 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/17/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <2.0 <20 <100 CB /17/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 < J < <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 < J 2350 < < <5.0 <5.0 <2.0 <2.0 <20 <100 CB /17/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 < <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 < J 1180 <2.0 < <5.0 <5.0 <2.0 <2.0 <20 <100 µg/kg Page 1 of 3

32 TABLE 2B Soil Samples Analytical Summary 822 W. Commercial St., Pomona, CA Sample Location CB10 CB11 CB12 CB13 Sample Number Sample Depth (feet bgs) Date of Collection Acetone 2-Butanone (MEK) Benzene Bromodichloromethane sec-butylbenzene tert-butylbenzene Chlorobenzene Chloroform (Trichloromethane) 1,1-Dichloroethane (1,1-DCA) 1,2-Dichloroethane (DCE) 1,1-Dichloroethene (1,1-DCE) cis-1,2-dichloroethene (cis-1,2-dce) trans-1,2-dichloroethene Volatile Organic Compounds (VOCs) EPA Method 8260B/5035 CB /17/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <2.0 <20 <100 CB /17/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < <2.0 <5.0 < J <5.0 <5.0 <2.0 <2.0 <20 <100 CB /17/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <2.0 <20 <100 CB /17/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < < J < <5.0 <5.0 <2.0 <2.0 <20 <100 CB /17/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <2.0 <20 <100 CB /17/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < < J < J <5.0 <5.0 <2.0 <2.0 <20 <100 CB /17/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <2.0 <20 <100 CB /17/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < < J < <5.0 <5.0 <2.0 <2.0 <20 <100 CB /18/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < < < <5.0 <5.0 <2.0 <2.0 <20 <100 CB /18/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < <2.0 <5.0 < <5.0 <5.0 <2.0 <2.0 <20 <100 CB /18/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < J <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <2.0 <20 <100 CB /18/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < <2.0 <5.0 < <5.0 <5.0 <2.0 <2.0 <20 <100 CB /21/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <2.0 <20 <100 CB /21/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 < <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < < J < <5.0 <5.0 <2.0 <2.0 <20 <100 CB /21/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 < <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < < < <5.0 <5.0 <2.0 <2.0 <20 <100 CB /21/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <2.0 <20 <100 CB /21/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 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<5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < <2.0 <5.0 < <5.0 <5.0 <2.0 <2.0 <20 <100 CB /22/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <2.0 <20 <100 CB /22/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <2.0 <20 <100 CB /22/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <2.0 <20 <100 CB /22/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < < J <5.0 <5.0 <5.0 <5.0 <2.0 <2.0 <20 <100 CB /22/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < < <5.0 <5.0 <5.0 <5.0 <2.0 <2.0 <20 <100 CB /22/ <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 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<2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < < < <5.0 <5.0 <2.0 <2.0 <20 <100 CB /22/ <200 <16 < J <40 <40 <40 <40 <40 <40 <40 < J 59.9J < <40 < <40 <40 < <160 <800 CB /22/ , <110 < J <275 <275 <275 <275 <275 <275 <275 < J 1510J 60, <275 <275 70,000 18, < < ,800 <1100 <5500 CB /22/ ,000 21,500 <50 < J <125 <125 <125 <125 <125 <125 <125 < J , J <125 21,200 10, < J < ,400 <500 43,100 CB /22/ ,000 31,200 <28 <70 <70 <70 <70 <70 <70 <70 <70 <70 <70 <28 <70 < <70 <70 < <70 <70 <70 <70 <70 <28 136J 1640J 113,000 CB /23/ , <10 <25 <25 <25 <25 <25 <25 <25 <25 <25 <25 <10 <25 < <25 <25 < J <25 <25 <25 < J 58.5J 283J <500 CB /23/ ,300 14,600 <10 <25 <25 <25 <25 <25 <25 <25 <25 <25 <25 <10 <25 < <25 <25 < <25 <25 <25 <25 <25 < J 210J <500 CB /23/ , <10 <25 <25 <25 <25 <25 <25 <25 <25 <25 <25 <10 <25 < J <25 <25 < <25 <25 <25 <256 <25 < J <100 <500 CB /23/ , <8 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <8 <20 < J <20 <20 < <20 <20 <20 <20 <20 <8 23.9J <80 <400 CB /23/ , <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 < <5.0 <5.0 <5.0 < < J <5.0 <5.0 <5.0 <5.0 <2.0 <2.0 <20 <100 CB /23/ , <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < < <5.0 <5.0 <5.0 <5.0 <2.0 <2.0 <20 <100 CB /23/ J <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <2.0 <20 <100 CB /23/ J <25 <2.0 <5.0 <5.0 <5.0 <5.0 < J <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 < J 405 < <5.0 <5.0 <5.0 <5.0 <2.0 <2.0 <20 <100 CB /23/ <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < < J <5.0 <5.0 <5.0 <5.0 <2.0 <2.0 <20 <100 CB /23/ <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <2.0 <20 <100 Ethylbenzene Isopropylbenzene p-isopropyltoluene µg/kg 4-Methyl - 2-Pentonone (MIBK) Naphalene n-propylbenzene Styrene 1,1,1,2-Tetrachloroethane Tetrachloroethene (PCE) Toluene 1,1,1-Trichloroethane (1,1,1-TCA) 1,1,2-Trichloroethane (1,1,2-TCA) Trichloroethene (TCE) 1,2,4 - Trimethylbenzene 1,3,5-Trimethylbenzene o-xylenes m,p-xylenes tert-butyl alcohol (TBA) Ethyl alcohol (Ethanol) Page 2 of 3

33 TABLE 2B Soil Samples Analytical Summary 822 W. Commercial St., Pomona, CA Volatile Organic Compounds (VOCs) EPA Method 8260B/5035 Sample Location Sample Number Sample Depth (feet bgs) Date of Collection Acetone 2-Butanone (MEK) Benzene Bromodichloromethane sec-butylbenzene tert-butylbenzene Chlorobenzene Chloroform (Trichloromethane) 1,1-Dichloroethane (1,1-DCA) 1,2-Dichloroethane (DCE) 1,1-Dichloroethene (1,1-DCE) cis-1,2-dichloroethene (cis-1,2-dce) trans-1,2-dichloroethene Ethylbenzene Isopropylbenzene p-isopropyltoluene 4-Methyl - 2-Pentonone (MIBK) Naphalene n-propylbenzene Styrene 1,1,1,2-Tetrachloroethane Tetrachloroethene (PCE) Toluene 1,1,1-Trichloroethane (1,1,1-TCA) 1,1,2-Trichloroethane (1,1,2-TCA) Trichloroethene (TCE) 1,2,4 - Trimethylbenzene 1,3,5-Trimethylbenzene o-xylenes m,p-xylenes tert-butyl alcohol (TBA) Ethyl alcohol (Ethanol) CB14 CB15 CB /28/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <2.0 <20 <100 CB /28/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < < <5.0 <5.0 <5.0 <5.0 <2.0 <2.0 <20 <100 CB /28/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < J <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <2.0 <20 <100 CB /28/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <2.0 <20 <100 CB /28/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < J <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <2.0 <20 <100 CB /28/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < < J <5.0 <5.0 <5.0 <5.0 <2.0 <2.0 <20 <100 CB /28/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < < <5.0 <5.0 <5.0 <5.0 <2.0 <2.0 <20 <100 CB /28/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < < J <5.0 <5.0 <5.0 <5.0 <2.0 <2.0 <20 <100 CB /28/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < < <5.0 <5.0 <5.0 <5.0 <2.0 <2.0 <20 <100 CB /28/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 < J <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < < <5.0 <5.0 <5.0 <5.0 <2.0 <2.0 <20 <100 CB /28/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 < <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 <5.0 2,280 < <5.0 <5.0 <5.0 <5.0 <2.0 <2.0 <20 <100 CB /28/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 < <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 <5.0 1,560 < < <5.0 <5.0 <2.0 <2.0 <20 <100 CB /28/2005 <25 <25 2.8J <5.0 <5.0 <5.0 <5.0 < J < <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 <5.0 1,170 < J < <5.0 <5.0 <2.0 <2.0 <20 <100 CB /28/2005 <25 <25 7.8J 5.6J <5.0 <5.0 <5.0 <5.0 <5.0 < <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 <5.0 1,780 <2.0 <5.0 < <5.0 <5.0 <2.0 <2.0 <20 <100 CB /28/2005 <25 <25 4.4J <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 < <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < <2.0 <5.0 <5.0 1,790 <5.0 <5.0 <2.0 <2.0 <20 <100 CB /28/2005 <25 <25 2.0J 6.8J <5.0 <5.0 <5.0 <5.0 <5.0 < <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < <2.0 <5.0 <5.0 1,080 <5.0 <5.0 <2.0 <2.0 <20 <100 CB /28/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < <2.0 <5.0 < <5.0 <5.0 <2.0 <2.0 <20 <100 CB /29/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < <2.0 <5.0 < J <5.0 <5.0 <2.0 <2.0 <20 <100 CB /29/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < < J < J <5.0 <5.0 <2.0 <2.0 <20 <100 CB /29/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < < < <5.0 <5.0 <2.0 <2.0 <20 <100 CB /29/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 < J <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < < < <5.0 <5.0 <2.0 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<5.0 <5.0 < <2.0 <5.0 < <5.0 <5.0 <2.0 <2.0 <20 <100 CB /29/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 < < <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < <2.0 <5.0 < <5.0 <5.0 <2.0 <2.0 <20 <100 CB /29/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 < <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < < J < <5.0 <5.0 <2.0 <2.0 <20 <100 CB /29/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 < <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < < J < <5.0 <5.0 <2.0 <2.0 <20 <100 CB /29/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 < <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < <2.0 <5.0 < <5.0 <5.0 <2.0 <2.0 <20 <100 CB /29/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 < <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < <2.0 <5.0 < <5.0 <5.0 <2.0 <2.0 <20 <100 CB /29/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 < <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < <2.0 <5.0 < <5.0 <5.0 <2.0 <2.0 <20 <100 CB /29/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 < <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < <2.0 <5.0 < <5.0 <5.0 <2.0 <2.0 <20 <100 CB /29/2005 <25 <25 <2.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 < J <5.0 <5.0 <2.0 <5.0 <5.0 <25 <5.0 <5.0 <5.0 < <2.0 <5.0 < <5.0 <5.0 <2.0 <2.0 <20 <100 Notes: Only analytes detected in one or more samples are listed J = Analyte dectected between Method Detection Limit and the Pratical Quantitation Lim ND = Not Detected ** Background concentrations ranges, in mg/kg, from Bradford, et.al., µg/kg Page 3 of 3

34 Table 3. Evaluation Summary, Soil Remedial Alternatives, 822 W. Commercial St., Pomona, CA. ALTERNATIVE INITIAL EVALUATION Effectiveness Implementability Estimated Relative Cost In situ vapor soil extraction and carbon adsorption treatment. Effective, commonly used technologies AQMD permitting required; electricity would need to be brought to equipment. Moderate Soil excavation and off site treatment and/or disposal. Effective but there are anticipated to be depth limitations that would not allow removal of deeper impacted soils AQMD permitting required for excavation (Rule 1166); shoring would be necessary in some parts of site. High Chemical oxidation plus soil vapor extraction. Soil vapor extraction effective; additional testing may be required to evaluate effectiveness of chemical oxidation AQMD permitting would be required for vapor extraction; electricity needs as above; RWQCB permitting may be required for injection of chemicals. Moderate to High No action. Not effective No implementability issues. Low

35 Table 4. Additional Evaluation, Soil Remedial Alternatives, 822 W. Commercial St., Pomona, CA ADDITIONAL EVALUATION ALTERNATIVE Reduction in Toxicity, Mobility, Volume Compliance with Applicable or Relevant and Appropriate Requirements (ARARs) Protection of Health and Environment Regulatory Acceptance Community Acceptance Vapor extraction from subsurface and carbon adsorption treatment. Yes Probable Yes Probable Probable Soil excavation and off site treatment and/or disposal. Yes Probable Yes, with proper engineering controls during construction Probable May be unacceptable to community Chemical oxidation plus soil vapor extraction. Yes Probable Yes Probable Probable No action. No No Unknown Unknown Unknown

36 CCR/RAP, 822 W. Commercial, Pomona APPENDIX A BORING LOGS

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49 SCS ENGINEERS BORING LOG 3900 Kilroy Airport Way Suite 100 Long Beach California BORING NUMBER cb1 Page 2 of2 Calsol JOB NUMBER task 4 Depth Sample Information 5 Il Q Q I 5 Q Il ac Q Q E 0 3 C EE Ell EE u 01 0 llo t1l mu 03 U 0 o J o E a t1l 5 Description Completion Detail 16 CB m Hf Sand grades to slightly finer 17 CB SP Light brown fine to medium sandwith granitic cobbles very dense slightly moist Recovered gravel only not enough to sample 20 CB SM Medium brown silty fine to coarse sandwith gravel and cobbles very dense slightly moist CB SW t t ii f f Medium brown fine to coarse sandwith gravel and cobbles angular to subrounded moderate grading dense slightly moist CB SP Medium brown fine to medium sandwith coarse to very coarse sand and some gravel moderate sorting slightly moist Cementbentonite grout 25 No recovery except one large cobble CB SP Medium brown fine to medium sandwith coarse to very coarse sand and somegravel moderate sorting slightly moist 28 CB SP 75 Medium brown fine to medium sandwith coarse to very coarse sandand some gravel moderate sorting slightly moist I g 29 ci o I Iii 30 CB SC Medium brown clayey medium to very coarse sand slightly micaceous moderate grading dense slightly moist D o ij 31 CB CL Medium brown medium to coarse sandy clay with gravel very stiff slightly moist o o o o J c o z Jl 33 11

50 SCS ENGINEERS BORING LOG 3900 Kilroy Airport Way Suite 100 Long Beach California BORING NUMBER cb2 Page 1 of 2 Calsol 123 N Hamilton Pomona CA JOB NUMBER task 4 REMARKS Depth Sample Information 5 IJ J t 16 C Q IJ E C c ui Q Q E EE s c IJ E ol lilo ml 0 0 C en enz CO Cl o J 2 a e c Asphalt surface Description Completion Detail Concrete 1 2 CB ML 11 5 Dark brown silt with medium to coarse sand medium stiff slightly moist No recovery 4 5 CB ML 8 8 Medium brown silt with some medium to coarse sand occasional cobbles stiff slightly moist limited sample recovery due to cobblein shoe 6 7 CB Y t Medium brown silt with some medium to coarse sand occasional cobbles stiff slightly moist limited sample recovery due to cobble in shoe 8 9 CB SW li Medium brown silty fine sand with coarse to very coarse sand some gravel and cobbles moderate grading slightly moist Cementbentonite grout ii 10 CB SW tl Jo 4 Light brown fine to medium sand with coarse to very coarse sand and somecobbles very dense slightly moist 11 CB SW r j iit j t Medium brown fine to very coarse sand well graded dense slightly moist 12 o l ci o 13 SM CB SP 11 r m t Light brown silty very fine sand stiff slightly moist Medium brown fine to medium sandwith occasional coarse sand moderate grading dense slightly moist I ti Cl l Io o CB SP B Sand grades with occasional coarse sand grains M o N o l o J 01 a z en Drilling Company Drilling Method Logged By Layne Christensen Hollow Stem Auger T Plunkett Kalmey Sampling Method 2 Split Spoon Date Started Date Ended Boring Diameter 8 in Time Started Time Ended Total Depth ft

51 SCS ENGINEERS BORING LOG 3900 Kilroy Airport Way Suite 100 Long Beach California BORING NUMBER cb2 Page 2 of 2 Calsol JOB NUMBER task 4 Depth Sample Information Ol 0 5 J III 0 c I I III 1o c c ui E I I c E E c 2 E III a l E J eco CI l l 0 C CI l l ens Z co 0 S 3 C Description Completion Detail CB SW ii Mediumbrown fine to medium sand with coarse to very coarse sand gravel and cobbles angular to subrounded very dense slightly moist CB SW t t 50 j 60 if r ti i Medium brown fine to medium sandwith coarse to very coarse sand gravel and cobbles angularto subrounded very dense slightly moist CB SW Jo i Medium brown cobbly medium to very coarse sand well graded angular to subrounded very dense slightly moist 20 CB SW tj t i CB SW 1004 CB GW SP 25 CB ML t Light brown gravelly fine to very coarse sand well graded angular to subrounded very dense slightly moist Light brown gravelly fine to very coarse sand well graded angular to subrounded very dense slightly moist Tan gravel with medium brown sand very dense dry Limited sample recovery Medium brown fine to medium grained sand with gravel and coarse sand well sorted dense slightly moist Medium brown silt with coarse sand very stiff dry Cementbentonite grout 26 r I o CJ j o J 0 I m a CJ g i o M o N o CJ o J CB SM 45 SP 28 CB CL CB SM ML Medium brown silty fine to coarse sand with coarse gravel angular to subrounded well graded very dense slightly moist Medium brown fine to medium sandwith occasional coarse sand grains well sorted medium dense slightly moist Medium brown silty day withfine to coarse sand very stiff dry Medium brown silty fine sand with some coarse sand dense slightly moist Medium to dark brown silt with day cobbles and occasional medium to coarse sand grains very stiff slightly moist to dry 0 o z m 33 11

52 SCS ENGINEERS 3900 Kilroy Airport Way Suite 100 Long Beach California Calsol 123 N Hamilton Pomona CA BORING log BORING NUMBER cb3 Page 1 of 2 JOB NUMBER task 4 REMARKS Depth Sample Information Cl 0 Q S o CI Q Q III a j 0 c c CI Q EE olz E EE E S1 0J c JII 0 CI CIlO en Cl Z IIlO os o J 2 c II C5 Asphalt surface Description Completion Detail Concrete 1 2 CB ML Light brown silt with occasional medium sand grains 2 stiff slightly moist CB ML Medium brown silt with fine to medium sand medium stiff slightly moist CB ML 7 8 Dark brown silt with fine to medium sand and occasional gravel stiff slightly moist 7 CB SW t t 1f Light J brown fine to medium sandwith some coarse sand and gravel and cobbles moderate sorting dense slightly moist I 8 Medium brown silty fine to coarse sand with gravel CB SM 16 moderate 9rading subrounded to subangular dense 25 slightly moist 9 t t f CB Medium brown fine to coarse sand wtih very coarse 0 50 sand and gravel moderate to well graded subrounded SW to subangular dense slightly moist Cementbentonite grout J 11 1 CB Sand grades with more gravel and cobbles 12 CB ML I Cl c J Medium brown silt with some fine sand slightly micaceous stiff slightly moist 0 I en Il Cl g CB SP Medium brown fine to medium sand with some coarse sand medium dense moderate to good sorting slighlty moist 0 0 Cl Drilling Company Layne Christensen 0 J Drilling Method Hollow Stem Auger Date Started Time Started Date Ended Time Ended Logged By T Plunkett Kalmey Total Depth ft z Boring Diameter 8 in Sampling Method 2 en Split Spoon

53 SCS ENGINEERS 3900 Kilroy Airport Way Suite 100 Long Beach California BORING NUMBER cb3 BORING LOG Page 2 of2 Calsol JOB NUMBER task 4 Depth Sample Information Ol III 0 5 J en c III l1o 0 0 E en iii E 0 s a E E E III c en ell a E EII 110 ell 0 3 en z co 0 c 3 C Description Completion Detail CB CB SW CB ML t 8 i I Medium brown fine to medium sandwith some coarse sand and gravel dense moderate sorting slightly moist Medium brown fine to very coarse sand with some gravel moderate grading dense slightly moist Dark brown silt wiht some fine to medium sand occasional coarse sand and gravel micaceous stiff slightly moist 20 CB SP 75 sw t Light brown fine to medium sandwith gravel and cobbles moderate sorting very dense slightly moist Light brown gravelly fine to very coarse sand well graded very dense slightly moist 23 CB CB SW 78 j t f Sand grades slighlty finer CemenUbentonite grout 24 Medium brown clayey silt withfine to medium sand and gravel very stiff slightly moist 25 CB ML CB ML 22 Medium brown clayey silt with fine to medium sand and gravel very stiff slightly moist l 28 CB Limited sample recovery e Cl d 0 J I 29 e 13 Ii a Cl CB ML SP g ML M 0 N 0 75 Medium brown clayey silt with some coarse sand grains very stiff dry Light brown fine to coarse sandwith gravel moderate sorting dense slightly moist Medium brown fine to coarse sandy silt stiff slightly moist 33 11

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90 CCR/RAP, 822 W. Commercial, Pomona APPENDIX B MAPS OF INFERRED SUBSURFACE PCE DISTRIBUTION

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