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Ms. Margaret Lagorio <br /> September 24, 1996 <br /> Page 7 <br /> When the operation of the GWETS was terminated, the effluent piping from the GWETS to <br /> the sewer was disconnected, and the connection point to the industrial sewer was capped to <br /> prevent any accidental releases. The zone of capture for the GWETS was determined during a <br /> step-drawdown test on April 26, 1990. Figure 7 illustrates the zone of capture. <br /> Conclusions <br /> Request for Site closure are based on the following reasons: <br /> 1. SVETS remedial technology was successful in removing petroleum hydrocarbons <br /> from the soil to non-detectable concentrations. Based on mass balance <br /> calculations,the amount removed exceeded the amount available for remediation. <br /> 2. GWETS remedial technology removed a small amount of petroleum hydrocarbons <br /> from the groundwater. The amount of petroleum hydrocarbons present in <br /> groundwater calculated by mass balance was minimal. <br /> 3. Groundwater concentrations are non-detectable at the Site, with a few exceptions, <br /> based on the past 4 years of quarterly monitoring. These few exceptions are <br /> intermittent low concentrations of petroleum hydrocarbons which are not <br /> statistically significant or consistent. <br /> If you have any questions or comments, please contact me at (916) 444-0123. <br /> Sincerely, <br /> BROWN AND CALDWELL <br /> k4 <br /> Joel ffman Jay Lucas <br /> Project Manager California Registered Geologist 44301 <br /> JC:PC:vlm <br /> Enclosures <br /> cc: Mr. Kyle Christie, ARCO Products Company <br /> Ms. Elizabeth Thayer, California Regional Water Quality Control Board, <br /> Central Valley Region <br /> • Use or disclosure of data continued on this sheet is subject to the restriction specified at the beginning of this <br /> document. <br /> 338MORRES MLO SURE.DOC <br />