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San Joaquin County DIRECTOR <br /> 'Donna Horan,REHS <br /> Environmental Health Department ASSISTANT <br /> DIRECTOR <br /> )o •co Laurie Cotulla, REHS <br /> 600 East Main 'Street <br /> 2 x i _ <br /> o '� < Stockton, California 95202-3029 <br /> yPROGRAM COORDINATORS <br /> : <br /> s �� Mike Huggins, RENS,RDI <br /> Margaret Lagorio, REHS <br /> AP Website: www.Sjgov.ory1ehd Robert Mcclellon,RENS <br /> Phone: (209) 468-3420 Jeff Carruesco,RENS,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. 5469 <br /> 130S. Wilson Way <br /> Stockton, California, 95205 <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-4; MW-6, MW-8., MW-9; MW-10, MW-11 and MW-13; and <br /> • ,Annual sampling — MW-1,,MW-2, MW-3, MW-5, MW-7 and MW-12. <br /> The EHD approves your proposed monitoring well sampling:schedule. <br /> Your consultant, Stantec, has proposed in the fourth quarter 2008 and first quarter 2009 reports, <br /> k cancelling the proposed upgrades to the ozone sparging system. The upgrade was proposed by <br /> SECOR in the third quarter 2007 report and was approved by the EHD by letter dated 10 <br /> December 2007. Although a technical justification for cancelling the upgrade was not provided, <br /> k the significant reduction of contaminant concentrations over the last few years appears to show <br /> the upgrade may be of limited benefit; therefore, the EHD approves the proposed cancellation. <br /> Questions or comments may be directed to Nuel Henderson at (209) 468-3436. <br /> Sincerely., <br /> r. Mar r a orio R <br /> Nuel C. Henderson J PG a e <br /> 9 9 , <br /> Engineering Geolo ist Program Coordinator <br /> 4 <br /> 9 9 9 9 <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 /> I _ <br /> Sampling Reduction Letter 0709.doc <br />