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San Joaquin County DIRECTOR <br /> ca u iN Donna Heran, REHS <br /> Environmental Health Department I' ASSISTANT DIRECTOR <br /> 600 East Main Street Laurie Cotuua,REHS <br /> �.a Stockton, California 95202-3029 <br /> PROGRAM COORDINATORS <br /> • Carl Borgman,REHS <br /> Mike Huggins, REHS,RDI <br /> FOR� P Website: www.sjgov.org/ehd Margaret Lagorio,REHS <br /> Phone: (209)468-3420 Robert McClellon, REHS <br /> Fax: (209) 464-0138 Jeff Carruesco, REHS, RDI <br /> Kasey Foley, REHS <br /> 06 May 2008 <br /> Jerry Moore <br /> Moore Petroleum <br /> 885 Portofino Drive <br /> Brentwood CA 94513-6539 <br /> Subject: Moore Petroleum Bulk Plant <br /> 5491 F Street <br /> Banta CA 95304 <br /> The San Joaquin County Environmental Health Department (EHD) has received and <br /> reviewed Sample Reduction Request Letter (SRRL) dated 23 January 2008, <br /> prepared by Apex Envirotech, Inc. (AEI) on your behalf. In the SRRL, AEI <br /> recommended reducing the sampling frequency of monitoring wells MW-2 and <br /> MW-4A to a semi-annual frequency and sampling monitoring Wells MW-12, MW-13 <br /> and MW-14 to. an annual frequency. API noted that the latter three wells were <br /> installed as sentinel wells. <br /> The EHD has reviewed the monitoring data for all the. current wells on the site, and <br /> based on the contaminant concentration histories of each well and the well locations, <br /> the EHD approves.the following monitoring frequency: <br /> • Quarterly - Monitoring wells MW-3, MW-7, MW-8.MW-10, MW-11, VEW-2 and <br /> RW-2; <br /> • Semi-annually — MW-4A in the former tank pit area and MW-12, being a <br /> sentinel well.for a domestic well in the oblique. down-gradient direction; and <br /> • Annually. — Outlier monitoring wells. MW-2, MW-5, MW-6, MW-9, MW-13, <br /> MW-14, MW-16, and MW-17. <br /> Questions or comments may be directed to Nuel Henderson at (209) 468-3436. <br /> Sincerely, <br /> Nuel C. Henderson, Jr., PG Margar Lagorio, R S <br /> Engineering Geologist Program Coordinator <br /> C: J. Barton, PG —CVRWQCB; 11020 Sun Center Dr. #200, Rancho Cordova, CA 95670 <br /> D. Lafontaine, PE—AEI; 11244 Pyrites Way, Gold River,.CA 95670 <br /> Monitoring Frequency Reduction Approval Letter 0508 <br />