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9 DRAFT 0 <br /> The subcontractor selected for excavation, transportation and disposal will arrange for <br /> soil profiling for landfill gate acceptance criteria and provide hazardous waste manifests <br /> for disposal documentation. <br /> Confirmation Soil Sampling Laboratory Analyses <br /> Each of the soil samples collected for quantitative analysis will be submitted under <br /> chain-of-custody control to Alpha Analytical Laboratories (Alpha) of Sparks Nevada. <br /> Alpha is a California State-certified laboratory able to perform the required analyses. <br /> Approximately fifty-nine (59) discrete confirmation soil samples collected from within the <br /> excavation will be submitted for the following analyses: <br /> • Total Purgeable Petroleum Hydrocarbons [C4-C10] including Benzene, Toluene, <br /> Ethylbenzene, Xylenes [BTEX] by EPA Method 8260 <br /> • Total Extractable Petroleum Hydrocarbons [C10-C40] by EPA Method 8015M <br /> The samples will be analyzed on a standard two-week turn-around-time (TAT) requiring <br /> approximately 10 working days. Please note expedited TAT can be obtained at <br /> additional costs. <br /> Sloping and Backfilling Operations <br /> Kleinfelder recommends sloping the excavation according to OSHA guidelines. Based <br /> on preliminary soil conditions (soil logs), Kleinfelder estimates a 1 '/2 to 1 slope will be <br /> acceptable during excavation activities. However, the excavation subcontractor will be <br /> responsible to ensure the slope conditions meet the requirement of OSHA and <br /> applicable state and federal regulations. Kleinfelder also recommends stockpiling <br /> apparent clean soil related to sloping operations followed by collecting 4-point <br /> composite soil samples of this material. Kleinfelder recommends collecting a single 4- <br /> point composite sample for each 2,000 cubic yards of this material. Assuming this <br /> material is clean, Kleinfelder recommends using this material for backfill operations. <br /> Kleinfelder proposes backfilling to 90% compaction using clean fill material. However, <br /> the backfill subcontractor will be responsible for backfilling with acceptable material at <br /> compaction rates suitable for the proposed land use. <br /> Task 2 — HEALTH RISK ASSESSMENT (HRA) <br /> A human health screening evaluation will be conducted to estimate the potential chronic <br /> health hazard from the potential contamination at the site. <br /> The health risk assessment will evaluate the following: <br /> Construction of a conceptual model for the property identifying receptor groups, <br /> exposure media, and exposure pathways. <br /> 44843.T04/ST05R997/DH:ly Page 7 of 14 <br /> ©2005 Kleinfelder, Inc. August 16, 2005 <br />