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San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> Donna Heran, REFS <br /> y 1868 East Hazelton Avenue <br /> Stockton , California 95205 -6232 RROGRAMCOORS <br /> Robert McClellon, REFS RENS <br /> Jeff Carruesco, REFS, RDI <br /> • �" i4' • <br /> Website: WWW.S OV. OY /ehd Kasey Foley, REFS <br /> '9 [ rFOR�. l� 9 Linda Turkatte, REHS <br /> Phone : (209) 468-3420 <br /> Fax: (209) 464.0138 <br /> September 13, 2012 <br /> Mr. Min Le <br /> McBillin 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 I, <br /> Dear Mr. Le: <br /> The San Joaquin County Environmental Health Department (EHD) has received and reviewed <br /> Preliminary Site Assessment Work Plan (work plan), dated 31 August 2012 , submitted by your <br /> consulting firm, Advanced GeoEnvironmental, Inc. (AGE) , on your behalf for the above- <br /> referenced site. The EHD had directed by letters dated 05 November 2010 and 16 April 2012, <br /> the submittal of a work plan to define the lateral and vertical extent of petroleum hydrocarbon <br /> contamination at this site. <br /> Initially, AGE proposes to advance four soil probe borings in the former underground storage <br /> tank (UST) area using direct push technology at locations illustrated on Figure 2 of the work <br /> plan . AGE proposes to: <br /> Collect soil samples from each boring at five-foot intervals to depths between 30 and 50 <br /> feet below surface grade (bsg) , or deeper if petroleum hydrocarbon contamination is <br /> encountered ; <br /> Collect grab groundwater samples from each boring ; <br /> Analyze groundwater and selected soil samples for total petroleum hydrocarbons as <br /> gasoline (TPH-g) ; benzene, toluene, ethylbenzene and total xylenes (BTEX) ; di- <br /> isopropyl ether (DIPE) , ethyl tertiary-butyl ether (ETBE) , methyl tertiary-butyl ether <br /> (MTBE) , tertiary-amyl methyl ether (TAME) , tertiary butyl alcohol (TBA) , 1 ,2- <br /> dibromoethane (EDB), 1 ,2-dichloroethane (1 , 2-DCA) and total lead. <br /> AGE proposes a second set of three borings that may be advanced at locations illustrated on <br /> Figure 2 of the work plan if analytical results from the initial investigation demonstrate a <br /> necessity for additional site assessment. The three proposed boring locations are on the <br /> eastern and southern edges of the property and north of the former UST area . AGE proposes <br /> to follow the same procedures for advancing the three borings as used when advancing the <br /> initial four boreholes. <br />