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P <br /> San Joaquin County DIRECTOR <br /> Q u Donna Heran, REHS <br /> El Hlth D <br /> oP'..•.i••N' nvironmentaeaepartment <br /> )• �; p ASSISTANT DIRECTOR <br /> 2 ' 2 600 East Main Street Laurie Cotulla,REHS <br /> N Stockton, California 95202-3029 <br /> • � r: . PROGRAM COORDINATORS <br /> • ..., Mike Huggins,REHS,RDI <br /> Margaret Lagorio,REHS <br /> Website: www.sjgov.org/ehd Robert McClellon,REHS <br /> Phone: (209)468-3420 Jeff Carruesco,REHS, RDI <br /> Fax: (209)464-0138 Kasey Foley,REHS <br /> June 22, 2009 <br /> Mr. John Johnson <br /> Former Cheaper Store Number 37 <br /> 765 Eubanks Drive, Suite D <br /> Vacaville, California 95688 <br /> Subject: Former Cheaper Store Number 37 <br /> 15 East Grant Line Road <br /> Tracy, California 95376-2720 <br /> By letter dated February._ 6, 2009, the San Joaquin County Environmental Health <br /> Department (EHD).approved the installation of four proposed monitoring wells, one off- <br /> site and three on-site, to delineate the vertical and lateral extent of the petroleum <br /> hydrocarbon plume at the above=referenced site. The EHD has reevaluated the approved <br /> scope of work based on.current groundwater analytical results submitted for the fourth <br /> quarter 2008, and the first quarter 2009. Concentrations of methyl tertiary-butyl ether <br /> (MTBE) have decreased significantly to levels at or near the. :primary maximum <br /> contaminant level (MCL) of thirteen micrograms per , liter (µg/L) in groundwater <br /> collected from the most impacted monitoring wells MW-1, MW-4, MW-5, and MW-8; <br /> therefore, the EHD rescinds the directive to install four monitoring wells. <br /> Instead, the EHD believes collecting grab groundwater samples will provide the <br /> information needed to define the MTBE plume and recommends the submittal of a work <br /> plan to meet this objective. Please respond to the EHD by August 20, 2009, with either a <br /> revised work plan that targets the groundwater at locations and depths identified by letter <br /> dated February 6, 2009,or your comments to the above recommendations. <br /> To comply with the State Water Resources Control Board Resolution No. 2009-0042, the <br /> EHD approves the semi-annual monitoring andsampling of monitoring wells: MW-1, <br /> MW-4, MW-5, .and MW-8; and the biennial monitoring and sampling of monitoring <br /> ' 'r <br />