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i <br /> f <br /> 139 South Center Street, Stockton, California January 21, 1994 _ <br /> Chevron U.S.A. Products Company Page 5 <br /> consisting of a dual optical sensor and electrical conductivity probe, that distinguishes between water <br /> and petroleum products. <br /> 3.6 Groundwater Sampling <br /> Groundwater monitoring and sampling were conducted on November 22, 1993, in accordance with <br /> the quarterly groundwater monitoring and sampling program at the site. Prior to sampling on <br /> November 22, 1993, each monitoring well was purged of four well volumes or until pH, conductivity <br /> and temperature had stabilized in the purged groundwater. Field data sheets with data recorded <br /> prior to sampling are included in Appendix C. Groundwater samples were collected using a teflon <br /> sampler cleaned with detergent and distilled water. distilled water field blanks and sampler rinsate <br /> blanks were collected to document ambient sampling conditions and the cleanliness of the sampler. <br /> Groundwater samples obtained from each of the six groundwater monitoring wells were labeled, <br /> placed on ice in an insulated container and delivered under chain-of-custody manifest to GTEL <br /> Environmental Laboratories in Concord, California. The groundwater samples were analyzed for <br /> BTEX and TPM-G by EPA methods 5030/8020/modified 8015. <br /> Purge water generated during the sampling process was stored in a DOT-approved purge water <br /> trailer and transported to the Chevron refinery in Richmond, California for recycling. <br /> GROUNDWATER <br /> TECHNOLOGY <br />