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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 (EHD), invites public comment regarding consideration by the EHD to grant regulatory closure for the leaking underground storage tank (LUST) case at the subject site (Site) identified below: SUBJECT SITE: Site Name: CALIFORNIA STOP GeoTracker Global ID No. T0607799497 Site Address 2224 Manthey Road, Stockton CA EHD Site Code: 0001317 PUBLIC COMMENT PERIOD: 60 Days — from (10 November 2014 to 09 January 2015) CASE SUMMARY: The EHD and the Central Valley Regional Water Quality Control Board (CVRWQCB), in cooperation with Mr. Thien Phan & Ms. Hoi Phan (property owners), Mr. Dung Thanh Phan and Ms. Nhuan Phan (responsible parties), and AGE (environmental consultant) have evaluated soil and groundwater conditions, and potential health concerns at the subject site resulting from an unauthorized release of gasoline from an underground storage tank (UST) system. The unauthorized release from the UST system was discovered in January 2002 when the dispensers and product piping were removed and replaced. At the current time there is an active UST system on the Site. Soil and groundwater investigations were conducted from August 2005 to May 2013, to characterize impacted soil and/or groundwater. AGE determined the extent to which the petroleum hydrocarbons have significantly impacted soil and groundwater. From the existing UST locations, groundwater contamination extended off-site toward the southeast/east approximately 150 feet. Based on the final investigation results, approximately 6,500 pounds (or 1,040 gallons) of gasoline fuel were estimated to have leaked into the subsurface. Approximately 0.32 pounds of methyl tertiary-butyl ether (MTBE) were removed during five groundwater batch removals in January 2010, and approximately 1.2 pounds of gasoline were extracted during an eight-hour soil vapor extraction feasibility pilot test in March 2012. Due to the low threat posed to human health, this site was recommended for closure by the California State Water Resources Control Board under California's Low-threat Closure Policy. Potential negative effects of the residual contamination on human health and the environment were evaluated by AGE, and found to be negligible. On the basis of groundwater monitoring and the site characterizations, and the recommendation of AGE, the EHD has concluded that the Site status is protective of the environment and human health for current and future Site use and for adjacent off-site areas. The EHD has submitted Case Closure Summary to the CVRWQCB. Once the EHD has addressed all public comments received, the EHD 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 EHD office located at 1868 East Hazelton Avenue, Stockton, California 95205. An EHD file review request form can be obtained from the EHD website at http://www.sjcehd.com. 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 Vicki McCartney at the EHD. Vicki McCartney can ba reached at (209) 468-9852, via e-mail at vmccartney@sjcehd.com, or in writing at 1868 East Hazeltc Avenue, Stockton, California 95205.