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Chevron <br /> Chevron U.S.A. Inc. <br /> 2 Annabel Lane,Suite 200, San Ramon, CA 54583 • Phone(4151838-5000 <br /> Marketing Operations <br /> O. Moller 5 August 1987 <br /> Division Manager,operations <br /> S.L. Patterson <br /> ' Area Manager,Operations � � o <br /> C.G.Trimbach D c <br /> S,Manager,Engineering <br /> James Miller `Y r <br /> o/'(�,;&ui jt�;, Environmental Health AUG 13 1`87 <br /> Local Health Department <br /> P. Q. Box 2009 <br /> Stockton, California 95201 ENVIROMENTAL HEALTH <br /> FERMIT/SERVICES <br /> RE: Chevron Service Station 9-7780 <br /> Fremont 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 chemical analysis done at the site to date. Addition- <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 /> 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 usage (both pumping rates and <br /> use ) . <br /> 3 . Develop a conceptual hydrogeological model and inputs for <br /> a numerical simulation. <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 /> the results and providing recommendations for further <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 r_Iat­ l 2.d March 1987 ) _ <br />