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San Joaquin County DIRECTOR <br /> O D ! N Donna Hemn, REHS <br /> �o?_ .coG Environmental Health Department ASSISTANT DIRECTOR <br /> r. ` y 600 East Main Street Laurie Cotulla, REHS <br /> N (illA. Stockton , California 95202 -3029 PROGRAM COORDINATORS <br /> Carl Bergman, RENS <br /> P • Website: wwws OV. OI' /ehd Mike Huggins, RENS, RDI <br /> FORa l8 9 Margaret Lagorio, REHS <br /> Phone: (209) 468-3420 Robert McClellon, REHS <br /> Fax: (209) 464-0138 Jeff Carruesco, REHS, RDI <br /> Kasey Foley, REHS <br /> January 16 , 2009 <br /> Mohammad S . & Wafa Matar Nasheem Khan , Avatar Sohal <br /> 1901 S. EI Dorado Street 5925 Terminal Apt. 1 7757 N . Ivanhoe Ave <br /> Stockton , CA 95206 Riverbank, CA 95367 Fresno, CA 93722 <br /> Subject: Quick & Save <br /> 1901 South EI Dorado <br /> Stockton , CA 95206 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed <br /> Additional Site Assessment Report — August 2008 dated August 29, 2008 (ASAR) and <br /> Dual Phase Extraction Pilot Study Work Plan (WP) dated October 6, 2008, both <br /> prepared by Advanced GeoEnviron mental, Inc. (AGE). <br /> In the WP, AGE proposes to perform a 3-day dual phase soil-vapor/ground water <br /> extraction ( DPE) pilot study to evaluate the effectiveness of the DPE process. The EHD <br /> approves the proposed scope of work as necessary and adequate [CA H &S Code, <br /> 25296 . 10(c)(3)] . <br /> Submit to the EHD the necessary well permit applications, the $89. 00 permit fee and the <br /> $315.00 inspection fee. Once the well permits have been approved , notify EHD of the <br /> proposed schedule for the work. The EHD requires a minimum 48-hour notice prior to <br /> initiation of any field work on the site. The EHD directs that the proposed work be <br /> implemented by March 20, 2009 . Include in the report of findings an estimate of the <br /> volume of impacted soil effectively addressed during the DPE test and the proportion of <br /> impacted soil that will be addressed by the final remediation system design. <br /> The investigation reported in ASAR consisted of advancing four cone penetrometer <br /> testing (CPT) borings to a depth of 120 feet below surface grade (bsg) to characterize <br /> the hydrogeological framework of the area and to collect soil and groundwater samples <br /> for laboratory analysis to define the vertical and lateral extent of impacted soil and <br /> groundwater. The data obtained during this and previous site investigations show <br /> significantly impacted soil present in the underground storage tank (UST) area <br /> (northeast area of site) to depths as great as 66 feet bsg ; total petroleum hydrocarbons <br /> quantified as gasoline (TPH-g) concentrations range from 32 to 2 , 600 milligrams per <br /> kilogram (mg/kg ), whereas in the surrounding area the TPH -g concentrations in <br /> impacted soil commonly range from 1 .2 to 6 .2 mg/kg . AGE concludes impacted soil is <br /> not delineated toward the north, east and south and recommends additional CPT <br /> borings to complete the delineation . Laboratory analysis of the collected grab <br /> groundwater samples detected dissolved petroleum hydrocarbons to depths as great as <br /> 105 feet below surface grade, with TPH-g concentrations ranging from 400 micrograms <br /> per liter (pg/1 ) to 23 ,000 (pg/1) . Based on these results AGE recommended advancing <br />