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San Joaquin County DIRECTOR <br /> o u N Donna Heran,REHS <br /> O?" C Environmental Health Department ASSISTANT DIRECTOR <br /> .G <br /> 600 East Main Street <br /> Laurie Cotulla,REHS <br /> y Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> Carl Borgman,REHS <br /> • 6' .; '�P • Website: www.s ov.or 1ehd Mike Huggins, REHS, RDI <br /> gtiko Rig 19 8 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 /> June 30, 2008 <br /> Mr. Gerald L. Thiemann <br /> 327 Blossom Drive <br /> Ripon, California 95366 <br /> Subject: Former Thiemann's Service Station <br /> 106 West Second Street <br /> Ripon, California 95366 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Soil <br /> Vapor Study, dated May 7, 2008, and Monitoring Report — Second Quarter 2008, Former <br /> Thiemann 's Service Station, 106 West Second Street, Ripon, California, dated June 17, <br /> 2008, both prepared and submitted by ATC Associates Inc. (ATC) on your behalf. Based <br /> on the analytical results from soil gas samples, it appears that human health and the <br /> environment are not at risk from aromatic gasoline constituents. ATC has recommended <br /> your site for closure consideration "based on current and recent historical groundwater <br /> quality data coupled with the results of a soil vapor intrusion study." <br /> ATC's assessment that this site may be a low-risk site based on soil gas results may be <br /> correct; however, the EHD is not convinced the same is true for impacted groundwater. <br /> ATC has reported that during the second quarter 2008 groundwater sampling event, <br /> concentrations for gasoline constituents have increased significantly in groundwater <br /> samples collected from monitoring well MW-2 while remaining non-detect, or detected at <br /> low concentrations, in groundwater samples collected from the five other onsite monitoring <br /> wells. Further review of historical groundwater data indicates that data gaps exist. <br /> Specifically, impacted groundwater has not been delineated vertically at the source area, <br /> nor has impacted groundwater been delineated laterally north of MW-2. For these reasons, <br /> the EHD can not concur. "This decision is subject to appeal to the State Water Resources <br /> Control Board (SWRCB), pursuant to Section 25296.40(a) (1) of the Health and Safety <br /> Code (Thompson-Richter Underground Storage Tank Reform Act - Senate Bill 562). <br /> Please contact the SWRCB Underground Storage Tank Program at (916) 341-5752 for <br /> information regarding the appeal process" <br />