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'Mr. Kyle Christie <br /> May 14, 1990 <br /> Page 10 <br /> .c <br /> as described above. It is unlikely that the contamination has moved very far off-site, if at all. <br /> Historically, 1,2-Dichloroethane has been detected in ATR-2, ATR-3, and ATR-4, but it has <br /> f exceeded the MCL for this constituent only in ATR-3. Tetrachloroethene was detected in ATR-6, <br /> but the concentration is below the MCL. ARCO will continue to monitor these constituents <br /> during each quarterly sampling event. The source of the 1,2-dichloroethane and tetrachloroethene <br /> is unknown. <br /> If you have any questions or comments regarding this report, please can me or Mr. Steve Misner <br /> at (916) 444-0123. <br /> Very truly yours, <br /> E, BROWN AND CALDWELL <br /> t <br /> i <br /> Vayyyucas, C.E.G. <br /> Project Manager <br /> r <br /> " JL:SP:mkw <br /> Enclosure <br /> cc/enc: Mr. Gordon Boggs, California Regional Water Quality Control Board, ' <br /> Central Valley Region <br /> ' Ms. Laurie Cotulla, San Joaquin County Local Health District <br /> Mr. Steve Misner, Brown and Caldwell <br /> Mr. Chris Winsor, ARCO Products Company <br /> Il .. <br /> Brown and Caldwell <br /> ' rAnSuliBniS <br />