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STATE OF CALIFORNIA 1 <br /> GEORGE DEUKMEJIAN,Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> CENTRAL VALLEY REGION <br /> 3443 ROUTIER ROAD <br /> SACRAMENTO,CA 95827-3098 - , <br /> ' ,✓ !� <br /> 12 October 1989 0 C T 1 f 1989 <br /> ENVIRONMENTAL HEALTH <br /> PERMITISERVICES <br /> Ms. Diane Hinson <br /> Registered Environmental Health Specialist <br /> Environmental Health Division <br /> San Joaquin County Department of Public Health Services <br /> P.O. Box 2009 <br /> Stockton CA 95201 <br /> J. <br /> MOORE PETROLEUM, 1399 EAST YOSEMITE AVENUE, MANTECA - PRELIMINARY <br /> HYDROGEOLOGIC ASSESSMENT REPORT <br /> We have reviewed the 25 July 1989 "Preliminary Hydrogeologic Assessment <br /> Report" prepared by Delta Environmental consultants, Inc. ,, for this <br /> site. Two additional monitoring wells were installed during this phase <br /> of investigation. The report summarizes -information from a past t <br /> investigation, and includes analytical results for one complete round of <br /> sampling. Based on -the low levels of-contaminants detected, the <br /> consultant has proposed quarterly sampling of the ground water <br /> i monitoring wells for a period of one year. <br /> The proposal to' conduct quarterly ' <br /> ground water monitoring may be` <br /> acceptable. However, we request'that an additional round of samples be <br /> obtained and analyzed to verify the initial results prior to <br /> implementing the quarterly monitoring program. We also request that <br /> L. after purging the wells, the samples be- taken with-.a bailer, rather than <br /> by pumping, to assure. that the samples are not being affected by the <br /> j polyethylene tubing used .in the pump. <br /> l <br /> If you have any questions, please call me at (916). 36.1-..5131. <br /> f <br /> j <br /> THOMAS D. PELTIER <br /> Engineering Geologist <br /> TDP/tdp <br /> i <br /> 4 <br />