SITE INFORMATION AND CORRESPONDENCE_CASE 2

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PUBLIC NOTICE Fact Sheet Pending Case Closure for Leaking Underground Storage Tank Site Advanced GeoEnvironmental, Inc_ (AGE), on behalf of the San Joaquin County Environmental Health Department (SJCEHD), invites public comment regarding the SJCEHD consideration to grant regulatory closure for a leaking underground storage tank (LUST) case on the Site identified below. SUBJECT SITE: Site Name: BLINCOE TRUCKING GeoTracker Global ID#(T 10000005922) James Blincoe Trust Site Address: 2431 East Mariposa Road, Stockton, California SJCEHD Site Code: 2118 PUBLIC COMMENT PERIOD: BEGINS: 01 April 2015 — ENDS: 01 June 2015 CASE SUMMARY: The SJCEHD in cooperation with the property owner and the responsible party, James Blincoe Trust„ and environmental consultant, AGE, have evaluated soil conditions at the Site resulting from historical unauthorized releases of diesel from an underground storage tank (UST) system and from fueling operations. The UST system, consisting of to& USTs and associated piping, was removed from the Site in March 2014_ two include mass of diesel Soil and remediation and soil investigations were conducted May and July 2014. removed On 22 May 2014, a total of approximately 436.7 tons of soil were loaded, transported and disposed at Forward Landfill in Manteca_ Approximately 150 cubic yards were generated during removal of the USTs in March 2014. The highest concentrations of TPH-d were detected near the northeastern and northwest walls of the Simplify excavation (sample EXE-East 20' and sample EXE-West 20'). TPH-d were detected in the two soil samples collected from the site at a maximum concentration of 2,600 mg/kg_ A sample collected at the western end of the excavation also detected low concentrations of TPH-d at 110 mg/kg_ TPH-d was also detected in the soil stockpile samples at concentrations of 16,000 mg/kg and 12,000 mg/kg for samples SP-EXE-1 and SP-EXE-2, respectively_ VOCs were also detected in the soil stockpile samples. In July 2014, soil samples were collected for bio-attenuation zone_analygis from borings B1, B2, 63 and B4 at five-foot intervals between fifteen and forty feet bsg. A total of nineteen samples were collected and analyzed from borings B1 through 64 during the July 2014 investigation; TPH-diesel and BTEX compounds, as well as naphthalene were not detected in soil samples collected from borings 131 through Not only for 134 vapor SJCEHD determined that the case meets the Low-Threat Closure Policy for vapor intrusion. The SJCEHD intrusion. has concluded that the Site status is protective of the environment and of human health for current and future Site use and for adjacent off-site areas. After receipt of notification that all case closure activities have been completed, the SJCEHD intends to issue a No Further Action Required letter for the subject Site.