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i 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 <br /> Collected groundwater samples were analyzed for benzene, toluene, ethylbenzene, xylenes <br /> (BTEX) and total petroleum hydrocarbons as diesel (TPHd) by Sequoia Analytical, a State- <br /> certified laboratory, utilizing EPA methods 8020 and,modified 8015, respectively. Analytical <br /> results are summarized in Table 3. Laboratory data sheets and chain-of-custody documentation <br /> are included in Attachment 3. <br /> Laboratory results indicate that BTEX was not detected above method detection limits in all <br /> collected groundwater samples. TPHd was detected in all collected groundwater samples at <br /> concentrations ranging from 56 parts per billion (ppb) (MW5) to 200 ppb (MW3), but was <br /> 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 1997 and will <br /> include sample collection from monitoring wells MW2, MW3 and MW6. <br /> s-, <br /> w:\94369\quartIy\IqnrI997.doc 2 <br /> • <br /> SNITH <br />