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L City of Stockton A68107.01B Ika", July 18, 1997 Page S representing sub-surface soil conditions at 6, 12, and 16 feet BSG were selected for laboratory analysis from soil probe location SP-3. Drawing 2 shows the approximate soil probe locations (SP-1 through SP-3). Drawing 3 shows a cross section view of soil probes SP-1, SP-1A, and SP-3. The soil probe equipment was decontaminated after completion of soil sample collection at each probe location. The soil sampler was decontaminated after collection of each soil sample. After completion of sampling, the soil probe holes were backfilled with a neat cement slurry. The slurry was placed into the open probe hole through a tremie pipe (casing) in a manner to preclude creating voids. 4.2.2 CkyRnd.waW Inveigg : A groundwater sample was collected from soil probe SP- 1's hole prior to backfilling. A temporary, 1-inch diameter, polyvinyl-chloride (PVC) casing was inserted into probe hole. The bottom ten-foot section of the PVC casing was machine Lcut with 0.01-inch slots. The casing was allowed to stand in the probe hole for a period of time deemed adequate for the groundwater to fill the casing below the water table. A groundwater sample was then collected through a 3/8-inch Teflon® tube with a positive displacement pump. Groundwater samples were decanted into appropriate sample containers, sealed, labeled, and placed in a cooler for transport to Twining's laboratory under chain-of-custody documentation. ..� 4 : Soil and groundwater samples selected for laboratory testing were chemically analyzed in the laboratory for the following selected PPCs: benzene, toluene, ethylbenzene, and xylenes (BTEX), methyl tertiary-butyl ether (MTBE), and total petroleum hydrocarbons - diesel range constituents (TPH-D). Preparation and analytical methods for the laboratory analyses and corresponding detection limits for reporting purposes are summarized in Table 1. ' s L%.V L L