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City of Stockton A68101.02C February 23, 1995 Page 9 After completion of soil sampling, the soil borings will be backfilled with a cement slurry containing approximately 5 percent (by weight) bentonite. Backfill will be placed in one continuous operation from the bottom to the top of the borehole. Auger cuttings from the borings and rinsate from the decontamination of drill tools will be sealed in United States Department of Transportation (DOT) approved 55-gallon drums, labeled, and stored on site in an area inaccessible to the general public. The report for this characterization will include a recommended method and time frame for disposal of the cuttings and rinsate based on soil sample analytical results. Disposal of the drill cuttings will be the responsibility of the client. 4.2 Groundwater Investigation: Groundwater samples will be collected from the three existing on-site monitoring wells consistent with our SOPS. In addition, after collecting the final soil sample from each soil sample location, the borehole will be advanced into the groundwater at least three feet. After removal of the auger, a temporary casing will be installed in the borehole. The bottom five feet of the casing will be 0.-01-inch slotted screen. The casing will be purged of at least three casing volumes. A groundwater sample will then be collected with a disposable bailer. Groundwater samples will be handled consistent with our SOPS. . Groundwater samples will be submitted for Iaboratory testing consistent with the analytical methods outlined in Section " 4.3 Laboratory Testing Program". The analytical results of groundwater samples collected are expected to provide data on PPC concentrations in groundwater at various locations. This data will be used to evaluate the lateral extent of PPC migration in groundwater. 4.3 Laboratory Testing Program: Soil and groundwater samples selected for chemical analysis will be tested chemically for BTEX, TPH-G and TPH-D as indicator parameters for the limits of PPC migration. To evaluate the leachability of the non-v e nts of TPH-G and TPH-D, a tonicity characteristic leaching procedur TC P eparation method 1311 will be performed on the soil samples. In addition, consistent with the request of the SJCPHS, the samples will also be analyzed for methyl tertiary butyl ether (MTBE). Proposed preparation and analytical methods for the laboratory analyses are summarized in Table 5.