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• • Soil Investigation Work Plan Pilkington North America,Inc. ' October 27,2010 Page 4 The direct push borings will be hydraulically advanced using a two (2)-inch diameter conical bit. The bit and associated push rods will be thoroughly cleaned before each boring is advanced using laboratory- grade, non-phosphate detergent and deionized water and double rinsed with deionized water. Decontamination rinsate will be placed in a 55-gallon drum, sealed, labeled, and stored on-site for recycling at an approved facility. Upon completion of the borings and sampling, the borings will be grouted with neat cement. ' Continuous core soil samples will be collected from the borings with a 1.75-inch outside diameter(O.D.), five (5)-foot long core barrel fitted with a clean, single use, polyethylene liner. The soil sampling equipment will be cleaned prior to collecting the samples using laboratory-grade, non-phosphate ' detergent and deionized water and double rinsed with deionized water. During the sampling, the core barrel will be driven in five(5)-foot intervals. The sample liner will be extracted from the core barrel and used for geological logging and field observations. The soil samples will be logged according to the Unified Soil Classification System (USCS). Portions of the soil samples will be placed in polyethylene bags and checked with a photoionization detector (PID) for the presence of volatile hydrocarbons. Geological logs will be prepared containing field observations including soil type, PID measurements, and the presence of staining or odor. Soil samples will be collected from the borings for laboratory ' analyses based on field observations and PID measurements. It is anticipated that a maximum of one soil sample will be collected from each boring for laboratory analyses. The soil cuttings will be placed in a 55-gallon drum, sealed, labeled, and left on-site to await disposal pending results of the laboratory ' analyses. Each soil sample collected for laboratory analyses will be cut from the liners. The liners will be sealed at ' the ends with Teflon® sheeting, capped, and labeled. The samples will be placed in a cooler with ice and delivered under chain-of-custody procedures to a California-certified laboratory for analyses. No groundwater samples will be collected for laboratory analyses since most of the proposed borings are located with the known LNAPL plume. If groundwater saturation conditions are encountered in any borings, observations including color and clarity, sample odor, and presence or absence of sheen or ' product phase will be noted in the logs. 4.3 LABORATORY ANALYSES ' The selected soil samples collected from the borings will be analyzed for diesel by EPA Method 8015B and for BTEX by EPA Method 8021. One composite soil cutting sample will be collected and analyzed for diesel, BTEX, and LUFV 5 heavy metals (cadmium, chromium, nickel, lead, and zinc) for disposal characterization purposes. 4.4 DIESEL DELIVERY SYSTEM INTEGRITY INSPECTIONS ' The diesel fuel underground piping delivery system was removed from service and abandoned following the 1996 leak discovery. All current product piping is located above ground and is subject to periodic inspection. It is assumed that the source of the current LNAPL present in the recovery wells is residual ' diesel-saturated soils associated with a 1996 leak; and that LNAPL is migrating from the saturated soil in the vicinity of the 1996 release through the relatively dense network of subsurface utility corridors located in the area. To verify this assumption, the Site will contract a licensed inspector to visually z Leaking Underground Fuel Tank(LUFT);EPA Method 200/6000/7000 series(to be determined). A is CONDOR