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San Joaquin County DIRECTOR <br /> Environmental Health Department Donna Hera <br /> M ASSISTANT DIRECTOR <br /> 600 East Main Street Laurie Cotulla,REHS <br /> a <br /> y , ` Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> Carl Borgman,REHS <br /> Mike Huggins,REHS, <br /> C4�%FpR�1\P Website: WWW.Sjg0v.org/ehd Margaret L goro, REHSDI <br /> Phone: (209) 468-3420 Robert McClellon, REHS <br /> Fax: (209) 464-0138 Jeff Carruesoo, REHS,RDI <br /> Kasey Foley,REHS <br /> KEN GILLIES <br /> GILLIES TRUCKING OCT .3 1 2007 <br /> P O BOX 8303 <br /> STOCKTON CA 95208 <br /> RE: Gillies Trucking SITE CODE: 1703 <br /> 3931 Newton Road RO: 0264 <br /> Stockton, CA 95205 <br /> The San Joaquin County Environmental Health Department (EHD) met with your <br /> consultant, Upgradient Environmental Consultants (UEC) on 26 October 2007 to discuss <br /> how to move your site toward regulatory closure. Attending the meeting were Victor <br /> Cherven, PhD, and Clyde Hebbron of UEC, and Margaret Lagorio and Nuel Henderson <br /> of the EHD. UEC informed the EHD that you had a scheduling conflict and could not <br /> attend the meeting but had authorized UEC to meet with the EHD in your absence. <br /> As noted in the EHD letter of 06 June 2007, neither the EHD nor the Central Valley <br /> Regional Water Quality Control Board (CVRWQCB) could concur with UEC's <br /> recommendation for closure of your site. The reasons for this are that there is a large <br /> mass of diesel fuel impacting soil in the lower unsaturated zone on your site that <br /> potentially could significantly impact groundwater should the groundwater elevation <br /> increase and there are a significant number of water supply wells in the area that may <br /> become impacted. The EHD and CVRWQCB believe that the intensely impacted soil <br /> must be remediated to minimize the potential future impact to groundwater in order to <br /> achieve a low-risk closure for your site. The purpose of the meeting was to discuss some <br /> possible remedial alternatives. <br /> There are few remedial options for deep vadose zone soil impacted by diesel fuel, such <br /> as is the case on your site; a situation that requires some creative approaches to <br /> achieve a significant contaminant mass reduction. The remediation goal would be to <br /> reduce the contaminant mass to a point at which the remaining mass would pose <br /> minimal impact to groundwater in the event of inundation of the impacted soil during <br /> periods of high groundwater elevation. Methods discussed at the meeting include: <br /> • Excavation; <br /> • Soil vapor extraction (SVE); <br /> • Bioventing; and <br /> • Injection of various oxidizing agents such as ozone, hydrogen peroxide, etc. <br /> Reduction of groundwater sampling for non-critical monitoring wells was also discussed. <br /> A sampling frequency ,reduction for wells not needed to monitor the dissolved plume <br />