SITE INFORMATION AND CORRESPONDENCE_FILE 2

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0 RECEIVE® PUBLIC NOTICE Fact Sheet APR 0 7 2014 Pending Case Closure for Leaking Underground Storage Tank Site ENVIRONMENTAL HEALTH ARCADIS, U.S. Inc. (ARCADIS), on behalf of the San Joaquin County EFIR WIRVISERWEHealth Department (SJCEHD), invites public comment regarding consideration by the SJCEHD to grant regulatory closure for the leaking underground storage tank (LUST) case at the subject site (Site) identified below: SUBJECT SITE: Site Name: Former Unocal Station #0187 GeoTracker Global ID No. T0607700539 Site Address: 437 East Miner Ave, Stockton, CA SJCEHD Site Code: #1181 PUBLIC COMMENT PERIOD: 60 Days — from April 4, 2014 to June 4, 2014 CASE SUMMARY: The SJCEHD and the Central Valley Regional Water Quality Control Board (RWQCB), in cooperation with Navin Patel (property owner), Chevron Environmental Management Company, (responsible party) and ARCADIS (environmental consultant) have evaluated soil and groundwater conditions, and potential health concerns at the subject Site resulting from unauthorized release of (gasoline, diesel, etc.) from an underground storage tank (UST) system. The unauthorized release from the UST system was discovered January 1992 when USTs and associated product piping and fuel dispenser islands were removed. At the current time there is not an active UST system on the Site. Soil and groundwater investigations were conducted from January 1992 to November 2012, to characterize impacted soil and/or groundwater. ARCADIS determined the extent to which the petroleum hydrocarbons have significantly impacted soil and groundwater. As of November 2012, the the contamination appears to extend approximately 80 feet off site. The total length of the plume, based on the most recent isoconcentration maps, is estimated to be 150 feet. In 2000, a soil vapor extraction test was conducted was conducted to remediate the soil at this site. Approximately 25 pounds of petroleum hydrocarbons were removed during this activity. In December 2000, an ozone sparge system was installed at the site to remediate groundwater and operated through 2005. Potential negative effects of the residual contamination on human health and the environment were evaluated by ARCADIS, and found to be negligible. On the basis of groundwater monitoring and the site characterizations, and the recommendation of ARCADIS the SJCEHD 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 SJCEHD will submit Case Closure Summary to the California Region Water Quality Control Board (CRWQCB). Once SJCEHD receives closure recommendation from CRWQCB and has addressed all public comments received, 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.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 Angelica Sandoval Marin at the SJCEHD. Angelica Sandoval Marin can be reached at (209) 468-2807, via e-mail at amarin(a)sicehd.com, or in writing at 1868 East Hazelton Avenue, Stockton, California 95205.