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San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> Z. ,��.�, .G Donna Heran, REHS <br /> a. 600 East Main Street <br /> Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> 11 � Robert McClellan,REHS <br /> • Jeff Carruesco, REHS,RDI <br /> ..:. jj\P Website: www.sjgov.org/ehd Kasey Foley,REHS <br /> FOR Phone: (209)468-3420 Linda Turkatte, REHS <br /> Fax: (209) 464-0138 <br /> March 3, 201 <br /> Mr. Victorio Aranda <br /> c/o Victor Aranda <br /> 1318 East Scotts Avenue <br /> Stockton, CA 95205 <br /> Subject: Former Electro Delta <br /> 821 South Wilson Way <br /> Stockton, CA 95205 <br /> Dear Mr. Aranda, <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Quarterly <br /> Groundwater Monitoring Report — Fourth Quarter 2010 (Report) dated February 15, 2011, <br /> submitted on your behalf by Advanced GeoEnvironmental, Inc. (AGE) and has the following <br /> comments. <br /> The Report documents a routine groundwater monitoring and sampling event conducted at <br /> your site in October 2010. In the Report AGE recommends preparing a work plan to conduct <br /> an air sparge pilot test to enhance the current remediation of soil vapor extraction. High <br /> concentrations of dissolved petroleum hydrocarbon contamination are reported in MW-5, and <br /> targeted remediation of the groundwater could be beneficial to the overall remediation effort. <br /> Please proceed with submittal of a work plan to conduct an air sparge pilot test. <br /> Per EHD letter dated December 21, 2010 only two wells, MW-3 and MW-5, are sampled on a <br /> semi-annual schedule. The other four groundwater monitoring wells are sampled annually. <br /> With the divergent groundwater flow patterns currently reported, the EHD considers this <br /> schedule adequate, and does not approve discontinuing sampling of MW-4, <br /> If you have any questions please contact Lori Duncan at (209) 468-0337 or by email at <br /> Iduncan(@sicehd.com. <br /> Sincerely, <br /> (,esu' A_C � �— <br /> Lori Duncan, REHS Nuel C. Henderson, Jr. PG <br /> Senior Registered Environmental Health Specialist Engineering Geologist <br /> c: James Barton, CVRWQCB 11020 Sun Center Drive, #200 Rancho Cordova, CA 95670 <br /> Ally Colavita, AGE 837 Shaw Road, Stockton, CA 95215 <br /> Susan Oakden, 1200 Watt Avenue, Sacramento, CA 95864 <br />