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2ND NOTICE PUBLIC NOTICE The preparation of this Fact Sheet was directed by the Regional Water Quality Control Board (Regional Board). This Fact Sheet has been reviewed and approved by James Barton of the Regional Board on August 13, 2013. The Regional Board invites public comment on a request for regulatory closure, made on behalf of the Department of General Services, for the former leaking underground storage tank (UST) at the former Blue Star property located at 4040 East Main Street, Stockton, California. Subject Site: Former Blue Star Property RECEIVED 4040 East Main Street, Stockton, California. GeoTracker Global ID#T0607746081 CVRWQCB Case#391140 SEP 12 2013 Public Comment Period: Through October 15, 2013 ENVIRONMENTAL HEALTH PERMIT/SERVICES Case Summary: This subject Site is currently vacant. No standing structures exist; only concrete slabs from the two former dispenser islands and former gas station building remain. Three former USTs were reportedly removed from the site in 2002, including one 6,000-gallon gasoline UST, one 12,000-gallon gasoline UST, and one 4,000- gallon diesel UST. 200 tons of soil was reported to be excavated during the UST removal in 2002 and placed back into the excavation. Three groundwater monitoring wells were installed in 2005 with groundwater samples collected during periodic sampling events conducted in 2007 that reported the presence of TPH-G, MTBE, and lead scavengers. Under contract from the California Department of General Services, GHD oversaw investigation and monitoring activities, including collection of groundwater samples from monitoring wells MW-1 through MW-3 in December 2011, the installation of additional off-site wells MW-4 and MW-5 in February 2012, subsequent monitoring and sampling events, and the installation and sampling of two soil gas probes for evaluating potential health risks associated with indoor soil vapor intrusion. In an effort to evaluate and monitor both the nature and extent of the petroleum hydrocarbon release, and its potential effect to human health, the environment, and water quality at the Site, multiple soil, soil vapor, and groundwater samples were collected between 2007 and 2013. Initial soil and groundwater samples collected from the Site contained gasoline constituents at relatively low concentrations and those concentrations have attenuated over time. Currently, only minor concentrations remain; and given Site conditions, those are expected to decrease in a reasonable time frame without additional migration as the extent of the groundwater plume remains stable. Based on the Human Health Risk Assessment (Risk Assessment) and the comparison of soil gas analytical results to established CHHSLs (2005) and ESL (2008) guidelines, residual concentrations at the Site do not pose an unacceptable risk to indoor air quality for either residential or commercial receptors. A Risk Assessment performed using groundwater results, also passes the State accepted criteria for a carcinogenic risk or hazard index for an adult or child resident. It should be noted that shallow groundwater beneath the Site is not currently being used as a domestic water supply. Regional Board Staff conducted a review of GHD's request for regulatory closure for the Site, and based on the data presented, believes there is merit to the request. After October 15, 2013, Regional Board Staff intends to complete its closure review process and close this former leaking UST case as a low risk Site under the SWRCB Low Threat Closure Policy (LTCP) that satisfies the case closure requirements of Health and Safety Code section 25296.10, and case closure is consistent with State Water Board Resolution 92-49. Where Do I Get More Information? General information regarding the Site can be obtained from the GeoTracker web Site at: http://geotracker.waterboards.ca._gov/profile report.asp?global id=T0607746081 and the case file for the Site is available at the Central Valley Water Board main office located at 11020 Sun Center Drive #200, Rancho Cordova, California 95670. How Do I Participate? Any interested individual has the opportunity to learn more about the case and its pending closure by submitting inquiries/comments to James Barton with the Central Valley Water Board by October 15, 2013. Mr. James Barton can be reached by phone at (916)464-4615, via Email at jim.barton@waterboards.ca.gov, by fax at (916)464-4704, or in writing at 11020 Sun Center Drive#200, Rancho Cordova, California 95670.