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California&gional Water Quality C*rol Board <br /> .., <br /> Central Valley Region Yom . <br /> v Karl E. Longley, ScD, P.E., Chair�© d H <br /> Linda S. Adams Arnold <br /> 11020 Sun Center Drive#200, Rancho Cordova, Californ 4 <br /> Secretary for Schwarzenegger <br /> Environmental Phone (916)464-3291 - FAX(916) 464-4645 <br /> Protection hftp://www.waterboards,ca.gov/centralvalley JUL 14 2009 Governor <br /> ENVIRONMENTHEALTH <br /> 13 July 2009 <br /> Ms. Jennifer Sedlachek <br /> ExxonMobil Oil Corporation <br /> 4096 Piedmont Ave, #194 <br /> Oakland, CA 94520 <br /> STATE WATER RESOURCES CONTROL BOARD RESOLUTION NO. 2009-0042, <br /> FORMER MOBIL STATION 99CAS, 75 ALPINE AVENUE, STOCKTON, SAN JOAQUIN COUNTY <br /> (CASE 390857) <br /> The California State Water Resources Control Board (State Water Board) adopted Resolution <br /> No. 2009-0042 requiring a reduction from quarterly groundwater monitoring to semi-annual or less <br /> frequent monitoring at all underground storage tank sites, unless site-specific conditions warrant <br /> otherwise. <br /> I reviewed your case file and semi-annual monitoring is not appropriate for your facility. This site is <br /> currently monitored under a staff directive letter, issued 15 November 2005, and several site wells are <br /> currently monitored on a quarterly basis. Investigations to date have not established the vertical and <br /> lateral extent of the groundwater plume in multiple aquifer zones. In a phone discussion with your <br /> consultant on 25 June 2009, we agreed that quarterly monitoring is appropriate at this time. Additional <br /> staff directives are pending a report of the latest well installations, and a pilot study has been approved. <br /> Due to the proposed pilot study for site remediation, it is necessary to continue quarterly monitoring to <br /> evaluate the effectiveness of the proposed remedial system(s). The monitoring requirements of staff <br /> directive remain in effect. We will revisit this decision by evaluating further reductions in monitoring after <br /> our receipt and review of future quarterly reports. <br /> If you have any questions or comments, you may call me at (916) 464-4615 or email me at <br /> ibarton(@waterboards.ca.gov. <br /> AMES L.L. BARTON, P.G. <br /> Engineering Geologist <br /> UST Enforcement Unit II <br /> cc: Ms. Carmen Harms, SWRCB, UST Cleanup Fund, OSCA Account, Sacramento <br /> Ms. Margaret Lagorio, San Joaquin County Environmental Health, Stockton <br /> Mr. Duane and Ms. Wendy Berdt, Guido Segarini Trust, PO Box 1810, Aptos 95001 <br /> Ms. Theresa Marler, 14245 Lora Drive, #16, Los Gatos, CA 95030 <br /> Mr. Kelly Reilly, 7808 Kelley Drive, Ste. F, Stockton 95207 <br /> Mr. Erik Appel, ETIC Engineering, 2285 Morelia Avenue, Pleasant Hill 94523 <br /> California Environmental Protection Agency <br /> 0 Recycled Paper <br />