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San Joaquin County DIRECTOR <br /> Donna Heran,REHS <br /> PpUl/y Environmental Health Department ASSISTANT DIRECTOR <br /> 600 East Main Street Laurie Cotulla,REHS <br /> a �III� < Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> L Mike Huggins,REHS, RDI <br /> Margaret Lagorio,REHS <br /> l° Website: www.sjgov.org/ehd Robert McClellon,REHS <br /> FR <br /> 4�i 0 � Phone: (209)468-3420 Jeff Carruesco,REHS,RDI <br /> Fax: (209)464-0138 Kasey Foley,REHS <br /> 01 July 2009 <br /> Mr. Sergio Morescalchi <br /> Environmental Business Manager <br /> Atlantic Richfield Company <br /> P.O. Box 1257 <br /> San Ramon, CA 94583 <br /> Subject: ARCO Service Station No. 6100 <br /> 25775 S. Patterson Pass Road <br /> Tracy, California, 95377 <br /> San Joaquin County Environmental Health Department (EHD) has received by email your letter <br /> dated 30 June 2009, in which you propose a reduction of the sampling schedule for your <br /> monitoring wells in response to Resolution 2009-0042, passed by the California State Water <br /> Resources Control Board. <br /> Specifically, you have proposed the following monitoring schedule: <br /> Semi-annual sampling — MW-1 through MW-10, MW-12 through MW-20, VW-1 through <br /> VW-14, and VW-16 through VW-20. <br /> The EHD has reviewed the data from these wells and approves the following monitoring well <br /> sampling schedule: <br /> Semi-annual — MW-1, MW-4 through MW-6, MW-8 through MW-10, MW-12, MW-15, <br /> VW-1 through VW-4, VW-6 and VW-20; <br /> Annual — MW-2, MW-13, MW-16 through MW-18, and VW-5; and <br /> When water is present— MW-3, MW-7, MW-14, MW-19, MW-20, VW-7 through VW-14, <br /> and VW-16 through VW-19. <br /> The latter wells have rarely or have never contained significant groundwater. Questions or <br /> comments may be directed to Nuel Henderson at (209)468-3436. <br /> Sincerely, <br /> Nuel C. Henderson, Jr., PG Margar Lagorio,, Re <br /> Engineering Geologist Program Coordinator <br /> C: Brian Westhoff—Stantec— 3017 Kilgore Road, Ste. 100, Rancho Cordova, CA 95670 <br /> James Barton, PG - CVRWQCB - 11020 Sun Center Dr. #200, Rancho Cordova, CA <br /> 95670 <br /> Sampling Reduction Letter 0709.doc <br />