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San Joaquin County <br /> oPa ' " Environmental Health Department DIRECTQR <br /> 1868 East Hazelton Avenue. Linda Turkatte. REHS <br /> Stockton , California 95205-6232 PROGRAM COORDINATORS <br /> . .' Robert McClellon, REHS <br /> 1 - Jeff Carruesco , REHS, RDI <br /> C<- . . . . ' 'P Kasey Foley, REHS <br /> w. <br /> QL � FO Rte` website: wwSfgov.. org/ehd Rodney Estrada, REHS <br /> Phone: (209) 4683420 Adrienne Ellsaesser, REHS <br /> Fax: (209) 4640138 <br /> December 8, 2014 <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 /> By letter dated 24 April 2014, the San Joaquin County Environmental Health Department (EHD) <br /> directed that operation of the dual-phase extraction (DPE) remediation system, consisting of soil <br /> vapor and groundwater extraction , cease. The EHD also directed that two consecutive quarters <br /> of groundwater rebound sampling be conducted following termination of the remediation system . <br /> The EHD has reviewed Dual Phase Extraction Remediation Report — Second Quarter 2014, dated <br /> 10 July 2014, Groundwater Monitoring Report — Third Quarter 2014, dated 28 August 2014, and <br /> preliminary analytical results for groundwater samples collected on 14 October 2014, all submitted <br /> by your consulting firm , Advanced GeoEnvironmental , Inc. (AGE) , on your behalf for the above- <br /> referenced site. AGE reported that on 24 April 2014, operation of the DPE remediation system <br /> was terminated at which time approximately forty pounds of total petroleum hydrocarbons as <br /> gasoline (TPH-g) had been removed by groundwater extraction and approximately one-hundred <br /> twenty-two pounds of TPH-g had been removed by vapor extraction over a period of <br /> approximately 24 days. Laboratory analytical results reported for groundwater samples collected <br /> on 10 July and 14 October 2014 indicate that concentrations of contaminants of concern have <br /> increased since termination of the DPE extraction system . Therefore , the EHD directs that the <br /> DPE remediation system be restarted immediately. <br /> The EHD has also reviewed Cone Penetration Testing Report, dated 19 September 2014, <br /> prepared and submitted by AGE . High concentrations of contaminants of concern have been <br /> reported in grab groundwater samples collected at approximately seventy-six to eighty feet below <br /> surface grade (bsg) from three of the four cone penetration testing (CPT) borings CPT-5, CPT-6 <br /> and CPT-8 advanced in July 2014. Based on the laboratory analytical results for benzene <br /> detected at 01 , 800 micrograms per liter (pg/L) and 5 , 600 pg/L in grab groundwater samples <br /> collected from the two most down-gradient borings , CPT-5 and CPT-8, respectively, as well as <br /> significant concentrations of other petroleum hydrocarbon contaminants detected in the <br /> groundwater samples, AGE recommends that a work plan be submitted to advance additional <br /> CPT borings down-gradient of the impacted CPT borings advanced in Judy 2014 ; and AGE <br /> recommends that a work plan to install additional monitoring wells in the areas of CPT-5 and <br /> CPT-8 be submitted to monitor- groundwater down-gradient of the site in the intermediate zone at <br /> approximately seventy-five to eighty feed bsg . <br />