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1 <br /> t Van Den Bergh Foods, Inc <br /> Quarterly Groundwater Sampling <br /> May 12, 1994 <br /> Page 2 <br />' of the excavation Refer to BSK/Remediation Services, Soil and Groundwater Investigation <br /> Report, November 10, 1992 for additional data and information. <br />' In February of 1993, BSK driIled and sampled four soil borings to depths of 74 feet below the <br /> ground surface Results of the analysis of the soil samples from the four borings indicate that <br /> petroleum hydrocarbons have not impacted soil beyond a radius of 35 feet from the former <br /> 1 underground tank location Refer to BSK/Remediation Services, Soil Investigation and Quarterly <br /> Groundwater Sampling Report, April 2, 1993 for additional data and information <br />' Groundwater monitoring well MW-4 screened between 75 and 95 feet below the ground surface <br /> has been sampled on a quarterly basis since October 1992 <br />' In December of 1993, BSK installed two additional groundwater monitoring wells MW-5 and <br /> MW-6. Monitoring wells MW-5 and MW-6 are screened between 70 and 90 feet below the <br />' ground surface <br /> GROUNDWATER SAMPLING METHODS <br /> Prior to sampling, the depth to water in monitoring wells MW-4, MW-5 and MW-6 was <br /> measured utilizing an electric sounding tape The top of the groundwater surface in the well and <br />' the bottom of the well was sampled for visual observations using a clear PVC bailer. The <br /> groundwater sample collected was examined for the presence of odors and indications of <br /> petroleum product. The well was then purged of at least four well volumes with a submersible <br />' pump Parameters for pH, electric conductivity, and temperature were measured after removal <br /> of each well volume Consistency of these measured properties indicate that fresh water was <br /> being drawn from the aquifer A groundwater sampling log was maintained for each well (refer <br /> to Well Field Logs) The groundwater removed during purging was placed into a 55-gallon DOT <br /> 17 E/H drum and labeled <br />' The groundwater was sampled with a Teflon`'` point source baler. The samples were placed into <br /> an appropriate sample container with preservatives added and labeled. The samples were stored <br /> in an cooler with ice and shipped to the BSK State-certified Analytical Laboratories in Fresno <br />' for chemical testing <br /> ANALYTICAL TESTING <br /> Chemical analyses were performed on the samples for Total Petroleum Hydrocarbons as Diesel <br /> (TPH-D) by Method DHS GC/FID and Benzene, Toluene, Ethylbenzene, Xylenes (BTEX) by <br /> EPA Method 5030 and 602M <br /> A summary of the analytical results from this sampling event and previous samplings is presented <br /> in Table 1 The Cham-of-Custody record, Analytical Laboratory Data Sheets, and the Level II <br /> QC Summary are attached <br /> &Associates <br />