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Mr. Don O. Culbertson Proposal P95-060.56 June 29, 1995 Page 3 is prepared to begin onsite activities prior to offsite access approval. EMCON will prepare a site-specific health and safety plan for the site. This plan will be prepared to fulfill the requirements of the Cal-OSHA Hazard Communication Standard(8 CCR 5194). Task 2 Soil and Shallow Groundwater Sampling EMCON will perform soil and shallow groundwater sampling using the Geoprobe Sampling System® (Geoprobe). Figure 5 indicates the proposed initial sampling locations. Additional locations will be sampled as necessary, to assess the extent of soil and groundwater impact. Because it may be necessary to complete Geoprobe borings offsite to the northeast to identify the extent of impacted soils and groundwater in these directions, it is assumed that CPL will conduct all necessary negotiations to gain access to these areas. The Geoprobe method produces fast results and modifications to the sampling program can be made as the field program progresses. This procedure has minimal impact on property and can acquire a large amount of data in a timely and cost efficient manner. The Geoprobe uses sampling rods of either 1.25 or 2-inch diameter which are pushed and/or driven with a truck-mounted rig. Use of the Geoprobe method allows the collection of soil samples at discrete intervals without retracting driving rods before each sampling event. The rig will collect soil samples at approximately 4-foot intervals bg and from the capillary fringe which is expected to occur within the depth interval from 20 to 25 feet bg. One boring completed next to Area 4 will be advanced to a sufficient depth to define the vertical extent of petroleum-hydrocarbon impacted soils as identified by examination with field instrumentation and visual inspection, or to the extent of the rig's capability. Soils encountered during the Geoprobe survey will be logged by an EMCON geologist using the Unified Soil Classification System under the supervision of a California-registered geologist. A detailed boring log will be completed for each boring and will be presented in the final report. In addition, the presence of hydrocarbon staining and odors will be recorded. Headspace analysis will also be performed on the soil samples in the field using a portable flame ionization detector (FID) to test for the presence of ionizable organic compounds. Soil samples will be selected for chemical analysis to quantify the petroleum hydrocarbons present and to identify the limits of petroleum-impacted soils. Soil samples will be selected for chemical analysis based on field observations of soil samples plus FID measurements. Soil samples selected for possible chemical analysis will be sealed with Teflon® tape and polypropylene end caps, placed in a cooler containing frozen gel packs, and transported to a state-certified laboratory. Chain-of-custody documentation, initiated at the time of sampling, will FRE/H\wp\proposa"506056.wp5-95 gtf:l