SITE INFORMATION AND CORRESPONDENCE FILE 1

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Chevron Chevron U.S.A. Inc. 2 Annabel Lane, Suite 200, San Ramon, CA 94583 •Phone 14151838-5000 Marketing Operations 5 August 1987 nc\�pT'1 O D.Moller Division Manager,Operations A`� S..L..Patterson Area Manager,operations .7 ,�Q�-� C.G.Trimhach n11G 1 Manager,Engineering James Miller ENVIROMENTAL HEALTH fy 'OEnvironmental Health tERMIT/SERVICES Ak16Z6)3 LocalHealthDepartment P.O. Box Stockton, California 95201 RE: Chevron Service Station 9-4054 Country Club Drive, Stockton, CA Dear Mr. Miller: Chevron U.S.A. Inc. is in the process of conducting an investiga- tion of the above-referenced site. -Z5Qg- &pLn+ Bwda✓ (11�lI�8�a� Attached is a copy of our most recent consultant ' s report and a summary of chemical analysis done at the site to date. Addition- ally, Chevron has contracted with EA Engineering, Science, and Technology, Inc. (EA) for further investigations at this site. Investigations will include: 1 . Sampling of existing monitoring wells. 2 . Review existing data provided by Chevron and readily available literature. 3 . Conducting an inventory of existing wells within a one- half mile radius including when available, location, depth, construction, yield, and usage (both pumping rates and use ) . 4 . Development of a conceptual hydrogeological model and inputs for a numerical simulation. 5 . A model using a worst plausible case approach assessing potential impacts, if any, on existing water supplies . 6 . Development of a brief risk assessment report outlining the results and providing recommendations for further action. Depending on the results of the review this report will either be prepared to comply with the preliminary report or the problem ass-=sm -nt report a= outlined by the Central Valley Regional hater Quality Control Board (Gordon Lee Boggs memo dated 24 March 1987 ) .