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ENVIRONMENTAL HEALTH DEPARTMENT <br /> P <br /> Donna K. Heran, R.E.H.S. SAN JOAQUIN COUNTY ProgramCoordinators <br /> Director 304 East WeberAvenue, ThirdFloor Carl Borgman, R.E.H.S . <br /> Laurie A. Cotulla, R.E.H.S. Stockton, California 95202-2708 Mike Huggins, R.E H.S., R.D.I. <br /> Assistant Director Telephone : (209) 468_3420 Margaret Lagono, R.E.H.S . <br /> Robert McClellon, R.E.H.S . <br /> Fax: (209) 464-0138 Jeff Carmeseo, R.E.H.S. <br /> Website: www. sjgov.org/ehd/ Kasey Foley, R.E.H.S . <br /> DAVID GUARDING AND PAT GUARDING MAR 0 8 2007 <br /> GUARDINO AND CRAWFORD CONSTRUCTION <br /> 517 W FREMONT ST <br /> STOCKTON CA 95201 <br /> RE : GUARDINO AND CRAWFORD SITE CODE : 1112 <br /> 517 W Fremont St. <br /> Stockton CA 95201 <br /> San Joaquin County Environmental Health Department (EHD) has reviewed Corrective <br /> Action Plan (CAP) dated November 22, 2006 and Quarterly Report — Fourth Quarter <br /> 2006 (QMR) dated January 24 , 2007 prepared by your consultant, Advanced Geo- <br /> Environmental, Inc. (AGE). <br /> The CAP describes the site stratigraphy to include a vadose zone with relatively high clay <br /> and silt content extending 17 feet below surface grade (bsg) into the saturated zone. <br /> Ground water elevation data in the 4`h QMR 2006 indicates ground water to be at <br /> approximately 13 to 16 feet bgs. This data indicates little coarse soil between the vadose <br /> zone and the proposed sparge depths . AGE evaluated remedial alternatives including <br /> excavation , ground water extraction (GWE), and soil vapor extraction enhanced by in-situ <br /> air sparging (SVE/IAS) . AGE concluded that SVE/IAS is likely to be the most cost— <br /> effective remediation technology for your site. <br /> EHD cannot yet concur with AGE that SVE/IAS is likely to be the most cost effective <br /> remediation technology for your site. EHD is concerned that the lack of coarse soil <br /> between the vadose zone and the sparge point depths will inhibit efficient migration of <br /> sparged air to the extraction wells. EHD recommends a pilot test be conducted for <br /> SVE/IAS. EHD also recommends that GWE be evaluated as for a clean up technology <br /> and that an aquifer pumping test be conducted if GWE is feasible . <br /> Submit a work plan for a pilot test for SVE/IAS or GWE remediation to the EHD by April <br /> 23, 2006. If you have any questions, please contact Frank Girardi at (209) 953-7868 . <br /> Donna Heran , REHS , Director <br /> Environmental Health Department <br /> Frank Girardi, Senior REHS Nuel C. Henderson , Jr. , PG <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV <br /> c: RWQCB, Central Valley Region — James L. L. Barton, PG <br /> c: Advanced GeoEnvironmental , Inc. — Jessica Rugge <br />