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San Joaquin County Environmental Health Department DIRECTOR .9 Donna Heran, RENS 1868 East Hazelton Avenue Q: a Stockton , California 95205-6232 PROGRAM COORDINATORS Robert McClellon, REHS Jeff Carruesco, REHS, RDI cq �; ° Website: www.sjgov.org/ehd Kasey Foley, REHS ei . Linda Turkatte, REHS Phone: (209) 468-3420 Rodney Estrada, REHS Fax: (209) 464-0138 Adrienne Ellsaesser, REHS June 12, 2013 Mr. Min Le McBillin Real Estate Investment 3087 Oldwood Court San Jose, California 95148 Subject: McBillin Real Estate Investment Site Code: 0001997 2154 South EI Dorado Street Stockton , California 95206 Dear Mr. Le: The San Joaquin County Environmental Health Department (EHD) has received and reviewed Additional Site Assessment Work Plan (work plan) , dated 22 May 2013, submitted by your consulting firm , Advanced GeoEnvironmental , Inc. (AGE) , on your behalf for the above- referenced site. By letter dated 10 May 2013, the EHD had directed the submittal of a work plan to advance one deep soil boring in the former underground storage tank (UST) area to assess the petroleum hydrocarbon impacted soil and possibly convert the borehole into a monitoring well to assess the vertical extent of impacted groundwater. In the work plan , AGE proposes: • Advancement of one deep soil boring (65) to a minimum of 100 feet below surface grade (bsg) at a location illustrated on Figure 2 of the work plan ; ' • Collection of soil samples for lithologic characterization at five-foot intervals between approximately 60 and 100 feet bsg , with adjustments of frequency and method of sampling based on consultation between the AGE field technician and geologist; Field screen soil samples for the presence of volatile organic compounds using an organic vapor meter equipped with a photo-ionization detector; Collection of grab groundwater samples at the base of the borehole; a Analysis of grab groundwater and select soil samples for total petroleum hydrocarbons as gasoline (TPH-g); benzene, toluene, ethylbenzene and total xylenes (BTEX); di- isopropyl ether ( DIPE) , ethyl tertiary-butyl ether (ETBE) , methyl tertiary-butyl ether (MTBE) , tertiary-amyl methyl ether (TAME) , tertiary-butyl alcohol (TBA) , 1 , 2- dibromoethane (EDB) , 1 ,2-dichloroethane (1 ,2-DCA) and total lead; • Determination of the conversion of the borehole into one monitoring well contingent upon soil and grab groundwater sample collection , field observations during the advancement of the borehole and at the direction of the EHD; • Installation of a deep-screened groundwater monitoring well (screened 95 to 100 feet bsg) , contingent upon the above bullet;