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it <br /> San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> ? ' =• ' P Donna Heran, REHS <br /> 1868 East Hazelton Avenue <br /> s Stockton , California 95205-6232 PROGRAM COORDINATORS <br /> . ` Robert McClellan, REHS <br /> - - Jeff Canuesco, REHS, RDI <br /> . /a�P Website: www.sjgov. org/ehd Kasey Foley, REHS <br /> FOR - Linda Turkatte, REHS <br /> Phone: 209 <br /> ( ) 4683420 Rodney Estrada, REHS <br /> Pax: (209) 464m0138 Adrienne Elisaesser, REHS <br /> May 10, 2013 <br /> Mr. Min Le <br /> MGBillin Real Estate Investment <br /> 3087 Oldwood Court <br /> San Jose, California 95148 <br /> Subject: McBillin Real Estate Investment Site Code: 0001997 <br /> 2154 South EI Dorado Street <br /> Stockton, California 95206 <br /> Dear Mr. Le: <br /> The San Joaquin County Environmental Health Department (EHD) has received and reviewed <br /> Preliminary Site Assessment Report (report) , dated 5 April 2013, submitted by your consulting <br /> firm , Advanced GeoEnvironmental , Inc. (AGE), on your behalf for the above-referenced site. By <br /> letter dated 13 September 2012 , the EHD had approved the advancement of four soil borings in <br /> the former underground storage tank (UST) area, proposed by AGE in Preliminary Site <br /> Assessment Work Plan, dated 10 September 2012. <br /> In the report, AGE presented soil lithology and analytical results from collecting soil samples at <br /> five-foot intervals beginning at twenty feet below surface grade (bsg) ; and groundwater <br /> analytical results from grab groundwater samples collected at approximately thirty-five feet bsg. <br /> Based on the concentrations of petroleum hydrocarbon contaminants detected in soil and <br /> groundwater during this investigation , AGE has recommended advancing one vertical boring to <br /> a minimum of 100 feet bsg in the area of the former USTs, near boring GW-6. <br /> The EHD approves AGE's proposal to advance one deep boring in the former UST area to <br /> define the vertical extent of the adsorbed and dissolved petroleum hydrocarbon plume. Once <br /> advanced to total depth , however, the EHD believes that it would be prudent and cost-effective <br /> to convert this boring, or a deeper portion of it, into a monitoring well to assess the vertical <br /> extent of impacted groundwater. The geologist in charge should select a proper depth interval <br /> for the deep-screened well based on field observations obtained during the advancement of the <br /> boring . <br /> Please submit a work plan for the advancement and installation of one boreholelmonitoring well <br /> to the END by 17 July 2013. If you have any questions regarding this letter, please contact <br /> Vicki McCartney at (209) 468-9852; or by email at vmcca 1neyCDDsicehd .com <br />