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nZIkir Y V .I j " <br /> SE' 2 G 2014 <br /> San Joaquin County <br /> O?° U `N c Environmental Health Department DIRECTOR- <br /> > ' — ° Donna Heran, REHS <br /> 1868 East Hazelton Avenue <br /> m { Stockton , California 95205-6232. PROGRAM COORDINATORS <br /> Robert McClellon, REHS <br /> Jeff Carruesco, REHS; RDI <br /> �q i? Website: www.sjgov.org/ehd KaseyFoley, REHS <br /> crroR � Linda Turkatte, REHS <br /> Phone: (209) 468-3420 <br /> ( ) Rodney Estrada, REHS <br /> Fax: (209) 464w0138 Adrienne Ellsaesser, REHS <br /> September 24, 2014 <br /> i • <br /> Mr. Min Le <br /> MCBillln Real Estate Investment <br /> 3293 Napa Drive <br /> - - San Jose, California 95148 <br />.,ILII <br /> Subject: McBillin Real Estate Investment Site Code: 0001997 <br /> 2154 South El 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 /> F-1 29 August 2014, submitted by your consulting firm , Advanced GeoEnvironmental, Inc. (AGE), <br /> i _ 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 /> ILL-I 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 /> J In the Second Quarter 2014 Report, AGE has recommended the following : <br /> e Reduction of monitoring and sampling MW-1 through MW-6 from quarterly to semi- <br /> I annually; <br /> 1 <br /> Installation of monitoring wells screened in the shallow zone off-site, toward the <br /> -I 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 two4housand- <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), di4sopropyl ether (DIPE), naphthalene and 1 ,24chloroethane (112-DCA) . <br />