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ZO Quarterly activities <br /> ' Quarterly monitoring activities were conducted on <br /> May 22, 1996. The groundwater depth in <br /> each monitoring well was measured using a Sohnsim water level meter. A summary of the <br /> measured groundwater depths is presented in Table 1 <br /> ' Approximately three well volumes of groundwater were purged from each monitoring well <br /> using a decontaminated submersible pump. Groundwater parameters including pH, electrical <br /> ' conductivity, dissolved oxygen and temperature were monitored during purging. After <br /> purging the wells, or when groundwater parameters stabilized, groundwater samples from <br /> ' each monitoring well were collected in one liter glass amber bottles One quality control <br /> sample (equipment rinsate) was also collected prior to the commencement of sampling Each <br /> ' sample was labeled, sealed and packed in an ice-box cooler that was maintained at a <br /> temperature of approximately 4'C using water-ice. The sample coolers were delivered to <br /> McCampbell Analytical Inc. (DHS Certification No. 1644), located in Pacheco, California, for <br /> sample analysis Groundwater sampling forms containing the data collected are presented in <br /> Appendix A <br /> The groundwater samples were analyzed for total petroleum hydrocarbons (TPH) as diesel <br /> only Analysis for TPH as gasoline and benzene, toluene, ethylbenzene, and xylenes (BTW <br /> was suspended by the San Joaquin County Senior Registered Environmental Health Specialist <br /> since historical soil and groundwater analytical data have indicated that these chemicals are <br /> absent at this site A summary of the groundwater analytical results for the site is presented <br />' in Table 2. <br /> The samples collected during this sampling event were analyzed for TPH as diesel using <br />' modified EPA method 8015. Analysis Request and Chain-of-Custody (ARCC) records <br /> accompanied the samples at all times (Appendix B). The Certified laboratory report, which <br /> includes the results for all the samples that were analyzed, is presented in Appendix C. <br />' Method detection limits followed those defined in the Leaking Underground Fuel Tank <br /> Manual, dated March 1989, and the Regional Water Quality Control Board's Tri Regional <br /> Board Staff Recommendations for Preliminary Evaluation and Investigation of <br /> Underground Tank Sites, dated August 1990. <br /> 1 � <br /> MZ107-22-96/VDBF196-0016 db 2-1 <br />