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San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> �,. •_,� ' • ,p Donna Heran, REHS <br /> Qr % 1868 East Hazelton Avenue <br /> �; Zmlll < <br /> Stockton , <br /> REHS <br /> California 95205-6232 PROGRAMCOORD <br /> S <br /> Robert McClellon, REHS <br /> Jeff Carruesco, REHS, RDI <br /> #y7;: :P • Website: www.sjgov. orglehLinda <br /> d Pokey, REHS <br /> Linda Foley, <br /> REHS <br /> Phone: (209) 468-3420 Rodney Estrada, REHS <br /> Fax: (209) 464-0138 Adrienne Ellsaesser, REHS <br /> October 28, 2013 <br /> I <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 /> The San Joaquin County Environmental Health Department (EHD) has received and reviewed <br /> Well Installation Work Plan (work plan), dated 09 October 2013, submitted by your consulting <br /> firm , Advanced GeoEnviron mental , Inc. (AGE) , on your behalf for the above-referenced site. By <br /> letter dated 12 September 2013, the EHD had approved the submittal of a work plan to install <br /> additional monitoring wells to delineate the lateral extent of the petroleum hydrocarbon plume <br /> that resulted from an unauthorized release from a former underground storage tank system . <br /> In the work plan , AGE proposes: <br /> Advancement of three well borings using 8 .25-inch hollow-stem augers at locations <br /> illustrated on Figure 2 of the work plan; <br /> • Collection of soil samples at five-foot intervals, beginning at five feet bsg, for lithologic <br /> evaluation, field inspection for the presence of volatile organic compounds using an <br /> organic vapor meter equipped with a photo-ionization detector, and chemical analysis of <br /> selected soil samples; <br /> • Installation of three monitoring wells at the three proposed boring locations , screened <br /> between approximately 25 and 45 feet below surface grade (bsg) , dependent on <br /> geologic/hydrogeologic conditions encountered during drilling ; <br /> • Completion of each well using two-inch-diameter Schedule 40 polyvinyl chloride casing <br /> with 0. 020-inch slotted well screens; <br /> • Analysis of groundwater samples collected quarterly from each well for one year, and <br /> selected soil samples collected during the well installations for: total petroleum <br /> hydrocarbons as gasoline (TPHg) ; benzene, toluene, ethylbenzene and total xylenes <br /> (BTEX) ; methyl tertiary-butyl ether (MTBE) , ethyl tertiary-butyl ether (ETBE) , tertiary- <br />