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APR 9 6 1992 <br /> ENVIRON! lEINTAE WEALTH <br /> ❑❑0 GROUNDWATER �nE� i�vlE <br /> ❑ ❑ TECHNOLOGY, INC. 4057 tort Chicago Highway,Concord,CA 94520(415)671-2387 <br /> FAX:(415)685-9148 <br /> April 10, 1992 <br /> Mr. Steve Schneider <br /> San Joaquin County <br /> Public Health <br /> P.O. Box 2009 <br /> 455 N. San Joaquin St. <br /> Stockton,•CA 95201 . <br /> RE: STORE #20680; 9110 THORNTON ROAD, STOCKTON CA <br /> Dear Mr. Schneider, <br /> This letter is provided to confirm our telephone conversation of April 10, 1992 wherein you approved <br /> a reduction in the groundwater elevation monitoring frequency from monthly to quarterly. As <br /> discussed, the quarterly monitoring will be conducted at the same time that the quarterly monitoring <br /> well sampling is performed. <br /> Sincerely, <br /> Groundwater Technology, Inc. <br /> Jan Whiffin <br /> Regulatory Affairs Manager, <br /> Western Region <br /> cc: Mr. Bud Good; Southland Corporation <br /> f <br /> Offices throughout the U.S.,Canada and Overseas <br />