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EnviroTech Consultants, Inc. Page 19 Site Investigation: Sampling Report Louise Avenue Water Treatment Facility 5.2 Composite Sampling and Disposal Following excavation, composite samples were collected by hand from each of the 12 roll-off bins. Composite samples were collected by collecting individual grab samples from different locations within the bin and mixing in the sample jar (RCRA August 2002). All soil samples were placed in glass jars capped with Teflon-lined lids, labeled with the soil sample name, time and date. The labeled jars were placed in zip-lock bags in a cold ice chest and transported under chain-of-custody procedures to BC Laboratories for analysis. All soil samples were analyzed for CAM-17 metals by EPA Method 6010-B, with solubility testing conducted as needed. Analytical testing was accomplished in accordance with the guidelines established in BC Laboratories Quality Assurance Manual, applicable standard operating procedures, and other related documentation. Analytical results for each of the roll-off bin composite samples were compared to the Potrero Hills Landfill Special Waste Acceptance Guidelines—Constituents Limits for"Subtitle D"Lined Cell Disposal(Attachment 6). All of the constituents in the composite samples were below the TTLC limits listed in the Potrero Hills Landfill Special Waste Acceptance Guidelines. Analytical results for the composite samples are included in Table 2, and the complete laboratory reports are included in Attachment 4. After approval from the Potrero Hills Landfill, the roll-off bins were removed from the Site, and the soil disposed of at the landfill. The non- hazardous waste manifests, and scale tickets are included in Attachment 7. 6.0 CONFIRMATION SAMPLES 6.1 Confirmation Sampling Following excavation, six confirmation samples were collected from the surface of the excavated area. Confirmation sample locations were selected to capture the areas that previously had high arsenic concentrations and a representative area of the excavation. Samples were collected by hand and placed in glass jars capped with Teflon-lined lids, labeled with the soil sample name, time and date. The labeled jars were placed in zip-lock bags in a cold ice chest and transported under chain-of-custody procedures to BC Laboratories for analysis. All soil samples were analyzed for arsenic and vanadium by EPA Method 6010-B, with solubility testing conducted as needed. Analytical testing was accomplished in accordance with the guidelines established in BC Laboratories Quality Assurance Manual, applicable standard operating procedures, and other related documentation. Figure 11 shows the confirmation samples labeled C01_3-14 through C01_3-19 within the approximate excavation area. 5400 Rosedale Highway 0 Bakersfield, CA 93308 0 Tel 661.377.0073 Fax 661.377.0074