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-------------------------------- <br /> (YVATC <br /> I <br /> ;R� A S S O C I A T E S I N C <br /> fr; <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. Field purge logs are presented in <br /> Attachment 1. <br /> LABORATORY ANALYSES <br /> Collected groundwater samples were analyzed by Sequoia Analytical, a State-certified laboratory, <br /> for total petroleum hydrocarbons as diesel (TPHd) utilizing EPA method 8015 and for benzene, <br /> toluene, ethyl benzene, and xylenes (BTEX) utilizing EPA method 8020. Analytical results are <br /> summarized in Table 3. Laboratory data sheets and chain-of-custody documentation are included <br /> in Attachment 2. <br /> Laboratory results indicate that TPHd was detected in groundwater samples collected from all <br /> wells at concentrations ranging from 90.4 parts per billion (ppb) in well MW1 to 8,890 ppb in <br /> well MW4. TPHd detected in wells MW3, MW5, and MW6 was reported by the laboratory as an <br /> unidentified hydrocarbon. <br /> RECONMIENDATIONS <br /> ATC recommends an additional quarterly monitoring event to better evaluate the site and monthly <br /> monitoring of the skimmer. If free product is encountered in the skimmer, it will be removed <br /> from the skimmer and stored on site. The next groundwater monitoring episode is scheduled to <br /> be performed in October 2000 and will include sample collection from monitoring wells 1V1W1 <br /> through MW6. <br /> I <br /> wA62574.021quart1y�3gmt2000.doc 2 <br />