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Work Plan—Site Sampling Page 16 West Weber Site-Stockton GPE Project 536.2 Upon reaching a depth adequate to obtain a suitable groundwater grab sample (estimated 12- 16 feet), the hollow drill rods are removed from the boring, and replaced with a length of'/2 inch PCV tubing with the lead 4-foot section being screened, thus creating a temporary well. A length of new, dedicated Teflon tubing fitted with a check valve is inserted inside of the PVC tubing and the oscillated to produce a stream of groundwater at the surface. Alternately, a peristaltic pump may be used to pump the water to the surface. In this case, new, dedicated tubing is also used. In either case, the water is transferred directly to laboratory-supplied sample containers. Each sample will be stored in 1-liter amber glass bottles provided by the laboratory. Each sample container will then be labeled and immediately transferred to a cooler chilled with water ice for transport to the laboratory under chain-of-custody. After collecting the final sample, each boring will be filled to grade with Class G neat cement. Upon retrieval, each groundwater sample will be transported to Argon Laboratories of Ceres, CA for analytical testing for one or more of the following as indicated above: • Total Petroleum Hydrocarbons as gasoline by EPA method 8015m, • Total Extractible Petroleum Hydrocarbons (diesel or oil)by EPA method 8015m and, • Semi-volatile organic compounds by EPA method 8270, • CAM 17 Metals by EPA method 7000 • Organochlorine pesticides by EPA method 8081A In general, a 1-liter sample container is needed for each analytical method selected. The specific chemicals and their reporting limits are listed in the tables of Appendix B. 2.1.5 Waste Disposal Decon water will be containerized in appropriate DOT containers for later recycling by a licensed hazardous waste hauler. No waste soil cuttings will be generated during the Geo- Probe drilling process or shallow soil sampling. 2.1.6 Documentation A general field log will be maintained during the field work. Notes will be made of the date and time of the work, the personnel on site,the general weather, and the sequence and time of significant field events. Careful notes will be taken of each shallow sample collected for laboratory analysis. The shallow soil samples will be accompanied by a log form (Figure 8) describing the sample as well as sample location and time. All of the field notes will be maintained in a notebook. The Geoprobe soil borings will be logged as described above. An example copy of the boring log form is attached as Figure 7. Photographs will supplement the log information. General site photos will be made that show the overall site and the sampling area. Specific photos showing field operation will be made to document field procedures. Notes of the photos, including time and location, will be entered in the field log. 2937 Veneman Avenue, Suite B240 Geo-Phase Environmental Inc. Phone: (209)569-0293 Modesto, Ca 95356 Fax: (209)569-0295