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1 <br /> 16 2.0 Quarterly Activities <br /> Quarterly monitoring activities were conducted on February 22, 1996 and February 28, 1996 <br /> The groundwater depth in each accessible monitoring well was measured using a Solinsem <br /> water level meter A summary of the 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 bailer Groundwater parameters including pH, electrical conductivity <br /> and temperature were monitored during purging After purging the wells, or when <br /> groundwater parameters stabilized, groundwater samples were collected in appropriate <br /> sampling containers One quality control sample (equipment nnsate) was also collected <br /> Each 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 Analytical requirements for TPH as gasoline and benzene, toluene, ethylbenzene, and <br /> xylenes (BTEX) were suspended by the San Joaquin County Senior Registered Environmental <br /> Health Specialist since historical soil and groundwater analytical data has indicated that these <br /> chemicals are not of concern at this site A summary of the groundwater analytical results for <br /> the site is presented in Table 2 <br /> rThe samples collected during this sampling event were analyzed for TPH as diesel using <br /> modified EPA method 8015 Analysis Request and Chain-of-Custody (ARCO) 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 /> MZJ05-07-96/VDBF/96-0007 If 2-1 <br />