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City of Stockton A68101.02E November I8, 1996 Page 2 probe location. The soil sampler will be decontaminated after collection of each soil sample. The soil samples will be examined for the purpose of preparing lithologic logs. Soil descriptions will be logged on a field boring log consistent with the Unified Soil Classification System(USCS). The soil sample will be field screened for evidence of volatile organic chemicals (VOCs) and/or other contaminates. The field screening consist of;visual observation for straining or free fluids, unusual odor, and head space analysis using a photoionization detector (PID). The procedure for performing head space analysis are described in the attached SOPs. The bottom six inches of the soil sample will be preserved for chemical analysis in the laboratory. The plastic liner will be cut, the open ends sealed with Teflon®tape and plastic caps, label attached, and placed in a cooler for transport to Twining's laboratory under chain-of-custody documentation. Soil samples will be submitted for laboratory testing consistent with the analytical methods outlined in Section " 4.2 Laboratory.Testing Program". The analytical results of soil samples collected are expected to provide data on PPC concentration attenuation in subsurface soil at various distances from the PPC source. This data will be used to evaluate the vertical and lateral extent of PPC migration in soil. After completion of sampling, the soil probe holes will be backfilled with a cement slurry (grout). The grout is pumped into the open probe hole as the probe sampler is withdrawn. The grout will be placed in one continuous operation from the bottom to the top of the probe hole. Decontamination rinsate of sampling tools will be used in mixing the backfill grout " AD ;