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During the first four weeks of weekly sampling events,water samples were collected in glass <br /> containers for delivery to a California-certified laboratory following proper preservation <br /> procedures and chain of custody documentation Effluent (E-1) samples were collected and <br /> analyzed for the following: <br /> 1. Total petroleum hydrocarbons as gasoline (TPH-G) using EPA Method 8015 <br /> (DHS modified) <br /> 2. Total petroleum hydrocarbons as diesel (TPH-D) using EPA Method 8015 <br /> (DHS modified) <br /> 3. Benzene, toluene, ethylbenzene, and total xylenes (BTEX) using EPA <br /> Method 8020 <br /> Analytical results from the fourth sampling event indicated that effluent from E-1 was not <br /> in compliance with NPDES permit discharge limits, therefore, the effluent was resampled <br /> on July 24, 1992. <br /> FINDINGS <br /> Analytical results and field parameter measurements completed by Alton Geoscience during <br /> the startup phase are summarized in Table 1. <br /> Laboratory reports and chain of custody records are included in Appendix A. Following is <br /> a summary of treatment system monitoring and sampling: <br /> • Approximately 6,190 gallons of ground water was treated and discharged <br /> during this sampling period. <br /> • No free product was observed in extracted ground water. <br /> • Analysis of effluent water samples collected from E-1 during the first three <br /> weekly sampling events, June 4, 11, and 17, 1992, did not detect TPH-G, <br /> TPH-D, or BTEX at or above reported detection limits. <br /> • Analysis of effluent water samples collected from E-1 during the fourth <br /> weekly sampling event, June 25, 1992, detected 0.68 parts per billion of <br /> toluene. <br /> • Analysis of effluent water samples collected from E-1 during resampling <br /> (July 24, 1992) did not detect TPH-G, TPH-D, or BTEX at or above <br /> reported detection limits. <br />