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Mr. Kyle Christie <br /> October 9, 1990 <br /> Page 10 <br /> The petroleum hydrocarbon concentration has remained constant or has idecreased in two of the <br /> seven wells. The petroleum hydrocarbon, concentration has increased significantly in wells <br /> ATR-1 through ATR-5. Historically, 1,2-Dichloroethane has been detected in ATR-2, ATR-3, <br /> and ATR-4, but was detected only in ATR-3 in April 1990. ARCO will continue to monitor <br /> these constituents during each quarterly sampling event. The source of the 1,2-dichloroethane <br /> is unknown. <br /> ARCO intends to.install groundwater extraction well(s) at the site during September 1990. As <br /> part of the design of the extraction wells, a pump test will be conducteiL The extraction wells <br /> will be connected to a treatment system at a later date. <br /> If you have any questions or comments regarding this report, please call me or Mr. Steve Misner <br /> at (916) 444-0123. <br /> Very truly yours, <br /> BROWN AND CALDWELL <br /> M <br /> Jay Lucas, C.E.G. <br /> Project Manager <br /> JCL:SDM:mkw <br /> Enclosure <br /> cc/enc: Mr. Gordon Boggs, California Regional Water Quality Control Board, <br /> Central Valley Region <br /> 'Mr. Harlan Knowles, San Joaquin County Local Health Dis&ict_� <br /> Mr. Steve Misner, Brown and Caldwell <br /> Mr. Chris Winsor, ARCO Products Company <br /> E <br /> I <br /> i <br /> r <br /> Brown and Caldwell <br /> Consultants <br />