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San Joaquin County <br /> Env ronmental Health Department DIRECTOR <br /> Donna Heran,REHS <br /> e. •�—y .2 1868 East Hazelton Avenue <br /> Stockton, California 95205-6232 PROGRAM COORDINATORS <br /> 1_tlSI:1-'_ Robert McClellon,REHS RS <br /> REHS <br /> Jeff Carruesco,REHS,RDI <br /> Kasey Foley,REHS <br /> Website: www.sjgov.org/ehd Linda Turkatte,REHS <br /> Phone: (209) 468-3420 <br /> Fax: (209)464-0138 <br /> July 26, 2012 <br /> Mr. Greg Gaut <br /> Comfort Air <br /> 1607 Turnpike Road <br /> Stockton, California 9 206 <br /> Subject: Comf rt Air, Incorporated <br /> 1607 1 urnpike Road <br /> Stocki on, CA 95206-1960 <br /> Dear Mr. Gaut: <br /> The San Joaquin Coui ty Environmental Health Department (EHD) has received and reviewed <br /> Corrective Action PI (CAP), dated 25 June 2012, submitted by your consulting firm, <br /> Advanced GeoEnviror nental, Inc. (AGE) on your behalf for the above-referenced site. The <br /> EHD had directed the ubmittal of the CAP by letter dated 17 January 2012. <br /> In the CAP, AGE com )ared soil remedial alternatives: excavation, soil vapor extraction (SVE) <br /> and dual-phase extr ction (DPE), and groundwater remedial alternatives: groundwater <br /> extraction (GWE), DP and in-situ chemical oxidation using ozone. AGE concluded that high <br /> vacuum DPE was co idered the most viable option to remediate the vadose, capillary fringe <br /> and upper saturated nes at this site. AGE recommended installing two four-inch diameter <br /> DPE wells, one scre ned between 10 and 30 feet below surface grade (bsg), and one <br /> screened between 25 ind 45 feet bsg at locations illustrated on Figure 12 of the CAP. <br /> Considering that dep -to-groundwater is currently about 17 feet bsg and lithological data <br /> collected from soil boi ngs MW-1, MW-2, CPT-1 and MW-6 indicate fine-grained soil between <br /> approximately 25 ani 1 45 feet bsg, the EHD needs additional information to justify the <br /> proposed screen inter al between 25 and 45 feet bsg for DPE-2. Please provide calculations <br /> that demonstrate the draw-down in DPE-2 will be sufficient to de-water the well and the <br /> surrounding Soil to pose and capture the vapor from the deeper adsorbed petroleum <br /> hydrocarbons for actu I dual-phase extraction to occur. Please provide this information to the <br /> EHD by 30 August 20 2. <br /> If you have any quesl ons or concerns, please contact Vicki McCartney at (209) 468-9852 or <br /> by e-mail at vmccartn y@sjcehd.com. <br />