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San Joaquin County <br /> Environmental Health Department <br /> DIRECTOR <br /> v � N 1868 East Hazelton Avenue Linda Turkatte,REHS <br /> :X Stockton, California 95205-6232 PROGRAM COORDINATORS <br /> Robert McClellon,REHS <br /> • �;,. _`- ,! ..P • <br /> Jeff Carruesco,REHS,RDI <br /> Website: www.SJgov.org/ehd Kasey Foley,REHS <br /> Phone: (209)468-3420 Rodney Estrada,REHS <br /> Fax: (209)464-0138 Adrienne Ellsaesser, REHS <br /> April 3, 2015 <br /> Michael Griffin John M. Leubberke <br /> St. John's Episcopal Church City of Stockton <br /> 316 North EI Dorado Street 425 North EI Dorado Street <br /> Stockton, CA 95202 Stockton, CA 95202 <br /> Juan & Elia Ruvalcaba TR <br /> 1404 North Monroe Street <br /> Stockton, CA 95203 <br /> Subject: Cancun Restaurant LOP Site Code: 001894 <br /> 135 East Miner Street <br /> Stockton, CA 95202 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed In-Situ <br /> Chemical Oxidation Pilot Study Report (IPSR) dated 30 November 2014, Semi-Annual <br /> Monitoring Report— Third Quarter 2014 (GWMR 1) dated 19 January 2015, and Semi-Annual <br /> Monitoring Report—First Quarter 2015(GWMR 2) dated 2 March 2015, submitted by Advanced <br /> GeoEnviron mental, Inc. (AGE). <br /> In January and February 2014, AGE performed an in situ chemical oxidation (ISCO) pilot test by <br /> injecting a hydrogen peroxide solution into select wells. Three post-ISCO groundwater sampling <br /> events within the month of February 2014 yielded marginally favorable results. Data presented <br /> from GWMR 1 and GWMR 2 show that specific groundwater criteria of the Low-Threat <br /> Underground Storage Tank Case Closure Policy (LTCP) have been met. Although the site <br /> meets LTCP criteria for direct contact/exposure to outdoor air, the site does not meet criteria for <br /> vapor-intrusion-to-indoor-air pathway as there is no bioattenuation zone. <br /> Please submit a professional evaluation of the potential for harmful vapor intrusion and, if <br /> necessary, provide a work plan for additional work required to meet LTCP vapor intrusion <br /> criterion. In IPSR, AGE recommended preparation of a remedial action work plan for ISCO <br /> injection. At this time, EHD does not approve of this recommendation, unless the professional <br /> vapor intrusion evaluation shows ISCO necessary to satisfy LTCP criteria. <br /> The EHD directs semi-annual monitoring of MW-1A, MW-1 B, MW-26, and MW-313; and biennial <br /> monitoring of MW-413. At minimum, groundwater samples from should be analyzed for total <br /> petroleum hydrocarbons as gasoline (TPH-g); total petroleum hydrocarbons as diesel (TPG-d); <br /> methyl-tert-butyl-ether (MTBE); t-Butyl alcohol (TBA); diisopropyl ether (DIPE); ethyl-t-butyl <br /> ether (ETBE); t-Amyl methyl ether (TAME); 1-2 dichloroethane (1,2-DCA); 1,2-dibromomethane <br /> (EDB); and benzene, toluene, ethylbenzene, xylenes (BTEX). <br />