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Van Den Bergh Foods, Company Quarterly Groundwater Sampling July 29, 1994 Page 2 ' Report, November 10, 1992 for additional data and information ' In February of 1993, BSK drilled and sampled four soil borings to depths of 74 feet below the ground surface. Results of the analysis of the sail samples from the four bonngs indicate that petroleum hydrocarbons have not impacted soil beyond a radius of 35 feet from the former t underground tank location. Refer to BSK/Remediation Services, Soil Investigation and Quarterly Groundwater Sampling Report, April 2, 1993 for additional data and information ' Groundwater monitoring well MW-4 screened between 75 and 95 feet below the ground surface has been sampled on a quarterly basis since October 1992. ' In December of 1993, BSK installed two additional groundwater monitoring wells MW-5 and MW-6 Monitoring wells MW-5 and MW-6 are screened between 70 and 90 feet below the ground surface ' GROUNDWATER SAMPLING METHODS Prior to sampling, the depth to water in monitoring wells MW-4, MW-5 and MW-6 was measured utilizing an electric sounding tape. The top of the groundwater surface in the well and the bottom of the well was sampled for visual observations using a clear PVC bailer. The ' groundwater sample collected was examined for the presence of odors and indications of petroleum product. The well was then purged of at least four well volumes with a submersible pump. Parameters for pH, electric conductivity, and temperature were measured after removal ' of each well volume. Consistency of these measured properties indicate that fresh water was being drawn from the aquifer A groundwater sampling log was maintained for each well (refer to Well Field Logs). The groundwater removed during purging was placed into a 55-gallon DOT ' 17 EIH drum and labeled The groundwater was sampled with a Teflon'point source bailer. The samples were planed into ' an appropriate sample container with preservatives added and labeled. The samples were stored in an cooler with ice and shipped to the BSK State-certified Analytical Laboratories in Fresno ' for chemical testing ANALYTICAL TESTING ' Chemical analyses were performed on the samples for Total Petroleum Hydrocarbons as Diesel (TPH-D) by Method DHS GC/FID and Benzene, Toluene, Ethyibenzene, Xylenes (BTEX) by ' EPA Method 5030 and 602M A summary of the analytical results from this sampling event and previous samplings is presented in Table 1 The Chain-of-Custody record, Analytical Laboratory Data Sheets, and the Level 11 QC Summary are attached. &Associates