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I. <br /> 1 , San Joaquin County DIRECTOR <br /> o U ! N Donna Heran, REHS <br /> Environmental Health Depnartment <br /> ASSISTANT DIRECTOR <br /> Wet 600 East Main Street Laurie Cotulla, REHS <br /> Stockton , California 95202-3029 <br /> PROGRAM COORDINATORS <br /> Mike Huggins, RENS, RDI <br /> Margaret La orio REHS <br /> Website: wwws .or /ehd g g ' <br /> � r FORS �govg Robert McClellon, RENS <br /> Phone: (209) 468-3420 Jeff Carruesco, RENS, RDI <br /> Fax: (209) 464-0138 Kasey Foley, REHS <br /> July 22, 2009 t i <br /> David Guardino and Pat Guardino <br /> Guardino and Crawford Construction <br /> 517 W Fremont St. <br /> Stockton , CA 95201 <br />,i Subject: Guardino and Crawford Site Code : 1112 <br /> 517 W. Fremont St. <br /> Stockton, CA 95201 <br /> The San Joaquin County Environmental Health Department (EHD ) has reviewed Well <br /> Installation and Feasibility Studies Report (Report) dated June 12 , 2009, prepared by <br /> your consultant, Advanced Geo Environmental , Inc. (AGE). In the report, AGE discusses <br /> the installation of one groundwater extraction (GWE) well (EW-1 ), one soil vapor <br /> extraction (SVE) well (VW- 1 ) , two GWE observation wells (013- 1 and 013-2), and two <br /> SVE observation wells (OW- 1 and 013-2), and pilot tests that were conducted for SVE <br /> and GWE <br /> In the report, AGE concludes that GWE is not a feasible option due to insufficient <br /> recharge in EW- 1 and recommends performance of SVE remediation utilizing the current <br /> well network, and performance of an in-situ air sparging (IAS) pilot test. The EHD <br /> concurs with AGE's recommendation ; you may submit a work plan to the EHD to <br /> conduct a pilot test for IAS and implementation of SVE remediation. <br /> To comply with the recently adopted State Water Resources Control Board Resolution <br /> #2009-0042, the EHD hereby modifies the monitoring well sampling requirements for <br /> MW-1 , 013- 1 , OB-2 , and EW-1 to semi-annually and MW-2 though MW-8 to biennially. If <br /> you have any questions , please contact Frank Girardi , Senior Registered Environmental <br /> Health Specialist at (209) 953-7868 . <br /> A W �,� <br /> ank Girardi , REHS Nuel C. Henderson , Jr. , PG <br /> Senior Registered Environmental Health Specialist Engineering Geologist <br /> C : James Barton , RWQCB , 11020 Sun Center Dr. #200 , Rancho Cordova, CA 95670 <br /> C: AGE — Rebecca E. Natal, Staff Scientist, AGE, 837 Shaw Road , Stockton , CA 95215 <br />