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San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> f Donna Heran,RENS <br /> z i 600 East Main Street <br /> w Stockton, California 95202-3029 FROGRAMCOORRS <br /> -� Robert McClellon,REHS <br /> Jeff Carruesco, REHS, RDI <br /> Kasey Foley,REHS <br /> C;CIF ORa`P Website: www.sjgov.org/ehd Linda Turkatte, REHS <br /> Phone: (209)468-3420 <br /> Fax: (209)464-0138 <br /> December 7, 2011 <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 /> The San Joaquin County Environmental Health Department (EHD) has reviewed Soil Vapor <br /> Extraction Rebound Test Report (Report) dated November 15, 2011, submitted on your behalf <br /> by Advanced GeoEnvironmental, Inc. (AGE) and has the following comments. <br /> The Report documents a rebound test of the soil vapor extraction (SVE) remediation system <br /> that has been in operation at the site since August 2010. The SVE system was shut down on <br /> August 22, 2011, and restarted on October 19, 2011. It operated for a period of approximately <br /> 24 hours, following which influent and effluent vapor samples were collected. Analytical results <br /> reported low concentrations of total petroleum hydrocarbons as gasoline and xylenes in the <br /> influent samples. <br /> AGE recommends no longer conducting remediation by SVE at the site. However, in <br /> correspondence dated October 31, 2011, the EHD approved a work plan to conduct an air <br /> sparging (AS) pilot test to address remediation of the remaining groundwater contamination. <br /> The work plan proposed to use the SVE system during the AS pilot test, and was approved with <br /> that condition. The SVE system may remain off until the pilot test is conducted, but must not be <br /> removed from the site until it is determined it will not be used during any other phase of <br /> remediation at this site. <br /> Please proceed with scheduling the previously approved pilot test for groundwater remediation. <br /> Deadline for conducting the pilot test is February 3, 2011. A Report of Findings is due for <br /> submittal within 60 days following completion of the test. <br /> If you have any questions please contact Lori Duncan at (209) 468-0337 or by email at <br /> Iduncanta'�sicehd.com. <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 />