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AM; Groundwater samples were collected on July 24, 1996 from wells MW 2, MW3 and MW6. No <br /> groundwater samples were collected from MW4 due to the presence of free product, Prior to <br /> sample collection, each sampled well was purged of a minimum of three well casing volumes of <br /> water. Purged water was contained in labeled 55 gallon drums (DOT H), and 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 <br /> collected groundwater samples. TPHd was detected in the sample collected from well MW2 at a <br /> concentration of 210 parts per billion (ppb), but was reported by the laboratory as a non-diesel <br /> Gr fJ mix. Weathered TPHd was detected in the sample collected from well MW3 at a concentration of <br /> 390 ppb. <br /> WORK IN PROGRESS <br /> The next groundwater monitoring episode is scheduled to be performed in October 1996 and will <br /> include sample collection from monitoring wells MW-1 through MW 6, including MW4 (if free of <br /> petroleum product sheen). <br /> w:1943Wquajttlyl3gmr]996.doc 2 <br /> • <br /> SMTH <br />