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San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> Donna Heran, REHS <br /> r. � y 1868 East Hazelton Avenue <br /> Kr.' "� PROGRAM COORDINATORS <br /> N. n'lll � Stockton , California 95205-6232 Robert McClellan, REHS <br /> LIISLlY. . ._ Jeff Carruesco, REHS, RDI <br /> • �' ° Website: www.sjgov. org/ehd Kasey Foley, REHS <br /> Linda Turkatte, REHS <br /> Phone : (209) 468 .3420 <br /> Fax: (209) 464-0138 <br /> April 24, 2014 <br /> i <br /> Mohammad S . and Wafa Matar Nasheem Khan <br /> 1901 South EI Dorado Street 5925 Terminal Apartment 1 <br /> Stockton, California 95206 Riverbank, California 95367 <br /> Subject: Quick N Save No. 1 <br /> 1901 South EI Dorado Street <br /> Stockton, California 95206 <br /> The San Joaquin County Environmental Health Department (EHD) has received and reviewed <br /> Dual Phase Extraction Remediation Report — Fourth Quarter 2013 (remediation report), dated <br /> 23 January 2014 , and Groundwater Monitoring Report — First Quarter 2014 (groundwater <br /> monitoring report) , dated 25 February 2014, both submitted by your consulting firm , Advanced <br /> GeoEnvironmental , Inc. (AGE) , on your behalf for the above-referenced site. The remediation <br /> report presented soil vapor and groundwater extraction results completed between 30 <br /> September and 30 December 2013; the groundwater monitoring report presented analytical <br /> results from groundwater sampling completed on 07 January 2014. <br /> AGE estimated that approximately 300 pounds of petroleum hydrocarbon vapor were removed <br /> by vapor extraction and approximately 18 pounds of total petroleum hydrocarbons as gasoline <br /> (TPH-g) were removed by groundwater extraction during approximate fifty-one days of <br /> operating the dual-phase extraction (DPE) system during the fourth quarter 2013. Groundwater <br /> contaminant concentrations collected in January 2014 remained approximately the same when <br /> compared to previous sampling events on either 15 February or 26 August 2013. <br /> Although the mass of petroleum hydrocarbon removed by vapor extraction increased from <br /> approximately 115 pounds during the third quarter 2013 remediation period to approximately <br /> 300 pounds during the fourth quarter 2013, the highest concentrations of benzene in <br /> groundwater are currently reported at approximately 400 micrograms per liter (lag/L) and the <br /> highest concentrations of methyl tertiary-butyl ether (MTBE) concentrations are approximately <br /> 65 lag/L, based on the January 2014 groundwater monitoring report. These contaminant <br /> concentrations are well below 3 , 000 lag/L for benzene and 1 , 000 lag/L for MTBE presented in <br /> the Low-threat Closure Policy (LTCP) checklist established by the State of California Water <br /> Resources Control Board (State Water Board) . Therefore, the EHD directs that operation of the <br /> DPE remediation system cease, effective immediately. Following termination of the DPE <br /> system , the EHD directs that two quarters of rebound sampling be conducted during which time <br /> groundwater should be collected from monitoring wells MWA through MW-5, MW-8 and <br /> MW-10 . Analyze the groundwater samples for TPH-g , benzene, toluene, ethylbenzene, total <br /> xylenes (BTEX) , MTBE, di-isopropyl ether (DIPS) , tertiary-amyl methyl ether (TAME) , tertiary <br /> butyl alcohol (TBA) and 1 , 2-dichloroethane ( 1 ,2-DCA) ; submit a report of findings to the EHD <br /> following the two sampling events. <br />