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(YVAT <br /> A S S O C I A T E 5 I N C . <br /> 4-ff 1. FF <br /> f <br /> product. Prior to sample collection, each sampled well was purged of a minimum of three well <br /> casing volumes of water. Purged water was contained in labeled 55-gallon drums (DOT H), and <br /> stored on site. <br /> Groundwater samples were collected after physical parameters (pH, temperature, and <br /> conductivity) were monitored and had stabilized. Dedicated disposable bailers with bottom- <br /> emptying devices were used to collect samples from the wells. All field activities were performed <br /> in accordance with the Field Methods included in Attachment 1. Field purge logs are presented in <br /> Attachment 2. <br /> LABORATORY ANALYSES F <br /> Collected groundwater samples were analyzed for total petroleum hydrocarbons as diesel (TPHd) <br /> by Sequoia Analytical, a State-certified laboratory, utilizing EPA method 8015. The analysis of <br /> groundwater samples for benzene, toluene, ethylbenzene, and xylenes has been discontinued in <br /> accordance with verbal approval by San Joaquin County Public Health Services/Environmental <br /> Health Division on March 26, 1997. Analytical results are summarized in Table 3. Laboratory <br /> data sheets and chain-of-custody documentation are included in Attachment 3. { <br /> Laboratory results 'indicate that TPHd was detected in groundwater samples collected from MM2, <br /> rs% MW3, MW5, and MM6 at concentrations ranging from 50 parts per billion (ppb) MW 5) to 280 <br /> ppb (MW3), but was reported by the laboratory as an unidentified hydrocarbon. <br /> WORK IN PROGRESS <br /> The next groundwater monitoring episode is scheduled to be performed in April 1998 and will <br /> 's <br /> include sample collection from monitoring wells MW3; MW4, and MW6. } <br /> I <br /> f <br /> r <br /> r <br /> F <br /> I <br /> f <br /> c <br /> fE <br /> ` s <br /> w:1943691quaAIy\l gmr1998.doc 2 # <br /> i <br />