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F <br /> Chevron <br /> Chevron U.S.A. Inc. <br /> 2 Annabel Lane, Suite 200, San Aamon, CA 94583 • Phone 14151 838-5000 s <br /> i <br /> Marketing Operations <br /> D.Moller 3 :5 August 1987 <br /> Division Manager,Operations <br /> S.L.Patterson <br /> ' Area Manager,operations _ PET <br /> C. G.Trimbach <br /> Manager,Engineering � <br /> CC-ic4l1 James Miller, <br /> Environmental Health AUG 13 987 <br /> REQ Local Healthl? Department <br /> P.O. Box 2009 ENVIROMENTAL HEALTH <br /> Stockton, California 95201 PERMIT/SERVICES <br /> RE: Chevron`iService Station 9-7780 j <br /> Fremorit,' St. , Stockton, .. CA <br /> Dear Mr. Miller: <br /> Chevron U. S.A. Inc. is in the process of conducting An investiga- <br /> tion of the above-referenced site:. <br /> Attached .is a copy of our most recent consultant ' s report and a <br /> summary of l'chemical. analysis dorie` at the site to date. Addition- i <br /> ally, Chevron has contracted with. EA- Engineering, Science, and <br /> Technology: Inc. ( EA) for further investigations at this site. <br /> Investigations will include: <br /> fi <br /> 1 . Review existing data provided .by Chevron and readily <br /> available literature. <br /> 2 . Conduct an inventory- of existing wells within a one-half <br /> mile radius including when available, location, depth, <br /> construction, yield, and `'u�s.age (both pumping :rates and � <br /> use ) . - <br /> 3 . Develop a conceptual.' hydrogeological model and inputs for <br /> a numerical simulation. 1 <br /> 4 . Model using a worst plausible case approach assessing <br /> potential impacts; if any,; on existing water supplies. <br /> 5 . Development of a brief risk assessment report outlining <br /> thee; results and providing recommendations for. further I <br /> action. Depending on the ".results. of the review this <br /> report will either be prepared to comply with the , <br /> preliminary report or the ;problem assessment report as <br /> outlined by the Central Valley Regional water: Quality <br /> Control Board ( Gordon Lee Boggs memo da.t­d 24 March 1987 ) _ . 1 <br /> 1 <br /> i.i r <br />