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: James Blincoe Trust GeoTracker Global ID# (T10000005922) Site Address: 2431 East Mariposa Road, Stockton, California SJCEHD Site Code: 2118 PUBLIC COMMENT PERIOD: 60 days -from: 06 April 2015 to 08 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. The UST system, consisting of two USTs and associated piping, was removed from the Site in March 2014. On 22 May 2014, a total of approximately 436.7 tons of soil were loaded, transported and disposed at Forward Landfill in Manteca. AGE estimates 11,354.2 pounds of diesel were removed from the site during both the UST removal and soil excavation activities. Soil samples were collected to confirm the soil remediation. The highest concentrations of total petroleum hydrocarbons as diesel (TPH-d) were detected near the northeastern wall of the excavation at a concentration of 2,600 milligrams per kilogram (mg/kg). A sample collected at the western end of the excavation also contained low concentrations of TPH-d at 110 mg/kg. TPH-d was also detected in the soil stockpile samples, minor concentrations of volatile organic compounds were also detected in the soil stockpile samples. TPH-d was not detected in the soil collected at the bottom of the excavation. In July 2014, four soil borings were advanced near and within the former tank pit to investigate the diesel impact to the site. Samples were collected from the borings at five-foot intervals between fifteen and forty feet below surface grade (bsg). TPH-diesel and BTEX compounds, as well as naphthalene were not detected in these soil samples. Therefore, it is believed that contamination is restricted to this site and did not migrate to neighboring properties. Groundwater samples were not collected; however, groundwater was not likely significantly impacted by contaminants pertaining to this UST release. SJCEHD determined that the case meets the Low-Threat Underground Storage Tank Case Closure Policy general and specific media criteria for a low-threat site and 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 addressing any concerns submitted to the SJCEHD during the public comment period regarding the pending case closure and receipt of notification that all case closure activities have been completed, the SJCEHD anticipates issuing a No Further Action Required letter for the subject Site. WHERE TO GET MORE INFORMATION: Site information can be obtained from the GeoTracker website at http://geotracker.waterboards.ca.gov/. Upon written request, the Site case file is available for review at the SJCEHD office located at 1868 East Hazelton Avenue, Stockton, California 95205. An SJCEHD file review request form can be obtained from the SJCEHD website at http//www slcehd com/docs/Public%20Records%2ORelease%20App.I)df. HOW TO PARTICIPATE: Interested individuals have the opportunity to learn more about this case and voice concerns regarding its pending closure by submitting comments to Gabriel Gonzalez of the SJCEHD by 8 June 2015. Gabriel Gonzalez can be reached at(209) 468-3442, via e-mail at gagonzalez@sjcehd.com, or in writing at 1868 East Hazelton Avenue, Stockton, California 95205.