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San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> Linda Turkatte, REHS <br /> 1868 East Hazelton Avenue <br /> �. < Stockton , California 95205-6232 PROGRAM COORDINATORS <br /> , . Robert McClellon, REHS <br /> - r Jeff Carruesco, REHS, RDI <br /> Website: wwwsjgov.org/ehd Kasey Foley, REHS <br /> t F o R Rodney Estrada, REHS <br /> Phone: (209) 468-3420 Adrienne Ellsaesser, REHS <br /> Fax: (209) 464-0138 <br /> February 19, 2015 <br /> R. M . B. Garage (Erardi Ventures) <br /> Mr. Vince Erardi <br /> P. O . Box 691000 <br /> Stockton, California 95269-1000 <br /> Subject: R. M . B . Garage (Erardi Ventures) <br /> 715 North Hunter Street <br /> Stockton, California 95269 <br /> Dear Mr. Erardi : <br /> The San Joaquin County Environmental Health Department (EHD) has received and reviewed <br /> Groundwater Monitoring Report — Second Quarter 2014 (Report), dated 30 September 2014, <br /> prepared and submitted by your consulting firm , Advanced GeoEnvironmental , Inc. (AGE) on <br /> your behalf for the above-referenced site. In the Report, AGE has recommended a revised <br /> sampling schedule, collection of grab groundwater samples down-gradient of monitoring wells <br /> MW-13 and MW-14, and conducting an in-situ chemical oxidation ( ISCO) pilot study involving <br /> the injection of RegenOxT°" or hydrogen peroxide to evaluate whether ISCO could expedite off- <br /> site cleanup of petroleum hydrocarbon contamination . <br /> The EHD has reviewed historical groundwater analytical data for this site and approves the <br /> following monitoring and sampling schedule : <br /> • Semi-annually collect groundwater samples from monitoring wells MW-1 through MW-5 , <br /> MW-11 , MW-141 MW-15 and dual-phase extraction well DPEA ; <br /> • Annually collect groundwater samples from monitoring wells MW-10 and MW-13; <br /> • Biennially collect groundwater samples from monitoring wells MW-6 through MW-8 and <br /> MW-12; <br /> • Survey monitoring well MW-9 immediately since this has not been done and collect <br /> groundwater samples from this well during the next sampling event; MW-9 has not been <br /> sampled since October 2008 and a sampling schedule for MW-9 will be determined once <br /> current analytical data are made available; <br /> • Semi-annually collect depth-to-water measurements from all wells ; <br />