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San Joaquin County <br /> PgDiN Environmental Health Department DIRECTOR <br /> i <br /> (Wr:m <br /> Donna Heron, REHS <br /> 1868 East Hazelton Avenue <br /> 1IlE '� Stockton , California 95205-6232 PROGRAM COORDINATORS <br /> J_ y_, / Robert McClellon, REHS <br /> Jeff Carruesco, REHS, RDI <br /> - - i Kasey Foley, REHS <br /> Website: www.sjgov. org/ehd <br /> Li <br /> � � F o R� nda Turkatte, REHS <br /> . <br /> Phone: (209) 468-3420 Rodney Estrada, REHS <br /> Fax: (209) 464-0138 Adrienne Ellsaesser, REHS <br /> September 12, 2013 <br /> Mr. Min Le <br /> McBillin Real Estate Investment <br /> —3087-Otdwood 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 /> Site Assessment and Well Installation Report (report) , dated 03 September 2013 , submitted by <br /> your consulting firm , Advanced GeoEnvironmental , Inc, (AGE) , on your behalf for the above- <br /> referenced site. By letter dated 12 June 2013, the EHD had conditionally approved Additional <br /> Site Assessment Work Plan, dated 22 May 2013, to advance one deep soil boring in the former <br /> underground storage tank (UST) area to assess the petroleum hydrocarbon impacted soil and <br /> possibly convert the borehole into a monitoring well to assess the vertical extent of impacted <br /> groundwater. <br /> In the report, AGE documented that significant concentrations of contaminants of concern were <br /> detected in all five soil samples collected at 60, 70, 85, 90 and 100 feet below surface grade <br /> (bsg) from borehole B5/MW-1 and groundwater collected from monitoring well MW-1 on 02 <br /> August 2013 . Based on these results, AGE has recommended the submittal of a work plan to <br /> install a network of monitoring wells screened within the shallow zone. <br /> The EHD approves the preparation and submittal of a work plan to install additional monitoring <br /> wells, screened within the permeable sand layer identified on soil boring logs for B1 through B4, <br /> to delineate the lateral extent of the petroleum hydrocarbon contaminant plume . Submit the <br /> work plan to the EHD by 15 November 2013. <br /> Continue to collect groundwater quarterly from MW-1 for one year and analyze the samples for <br /> total petroleum hydrocarbons as gasoline (TPHg) ; benzene , toluene, ethylbenzene and total <br /> xylenes (BTEX) ; methyl tertiary-butyl ether (MTBE) , ethyl tertiary-butyl ether (ETRE) , tertiary- <br /> amyl methyl ether (TAME) , di-isopropyl ether (DIPS) , tertiary butyl alcohol (TBA), 1 ,2- <br /> dibromoethane (EDB) and 1 ,2-dichloroethane ( 1 , 2-DCA) . After one year collect groundwater <br /> samples from MW-1 semi-annually for laboratory analysis. <br />