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San Joaquin County <br /> pa V. ! NDfRECTOR <br /> EtwIrom-neniial Health Depart. rraetAl <br /> Donna Heran, REHS <br /> r 1868 Eget Hazelton avenue <br /> N: PROGRAM COORDINATORS <br /> Stockton , California 95205 -6232 <br /> Robert McClellon, REHS <br /> Jeff Carruesco, REHS, RDI <br /> Kasey Foley, REHS <br /> q � . Fo.R a` Website: www.sjgov.org/ebc! Linda Turkatte, REHS <br /> Phone : (209) 468-3420 Rodney Estrada, REHS <br /> Fax: (209) 464m0138 Adrienne Ellsaesser, REHS <br /> September 24, 2014 <br /> Mr. Min Le <br /> McBillin Real Estate Investment <br /> 3293 Napa Drive <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 /> San Joaquin County Environmental Health Department (EHD) has received and reviewed <br /> Groundwater Monitoring Report — Second Quarter 2014 (Second Quarter 2014 Report) , dated <br /> 29 August 2014, submitted by your consulting firm , Advanced GeoEnvironmental , Inc. (AGE) , <br /> on your behalf for the above-referenced site. The Second Quarter 2014 Report presented <br /> groundwater analytical results for samples collected from monitoring well MWA , screened in the <br /> deep zone at approximately ninety to ninety-five feet below surface grade (bsg) , and monitoring <br /> wells MW-2 through MW-6 , screened in the shallow zone at approximately twenty-five to forty- <br /> five feet bsg . <br /> In the Second Quarter 2014 Report, AGE has recommended the following : <br /> Reduction of monitoring and sampling MW-1 through MW-6 from quarterly to semi- <br /> annually; <br /> Installation of monitoring wells screened in the shallow zone off-site, toward the <br /> northeast, east, and southeast to define the lateral extent of the petroleum hydrocarbon <br /> groundwater plume down-gradient of the source area, and toward the west to define the <br /> lateral extent of the impacted groundwater plume up-gradient of the source; and <br /> • Preparation of a sensitive receptor survey showing receptors within a two-thousand- <br /> square-foot area surrounding the site . <br /> Based on the stable but high concentrations of contaminants of concern detected in <br /> groundwater from the six monitoring wells currently sampled quarterly at this site, the EHD <br /> directs that these six wells be sampled annually instead of semi-annually as proposed by AGE . <br /> Analyze the groundwater samples for total petroleum hydrocarbons (TPH) as gasoline (TPH-g); <br /> TPH as diesel (TPH-d); benzene, toluene , ethylbenzene and total xylenes (BTEX) ; tertiary-amyl <br /> methyl ether (TAME) , di-isopropyl ether (DIPE) , naphthalene and 1 , 2-dichloroethane ( 1 ;2-DCA) . <br />