SITE INFORMATION AND CORRESPONDENCE_CASE 2

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RECEIVED PUBLIC NOTICE MAY G 7 2015 Fact Sheet Pending Case Closure for Leaking Underground Storage Tank $"RONMENTAL_HEALTH PERMIT/SERVICEE SOMA Environmental Engineering, Inc. (SOMA), 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. The Site is currently owned by CEMEX, a Mexican multinational building materials company. SUBJECT SITE: Site Name: RMC Pacific Materials GeoTracker Global ID No. T0607700371 Site Address: 30350 S. Tracy Blvd., Tracy EHD Site Code: 1737 PUBLIC COMMENT PERIOD: 60 Days —from May 5, 2015 to July 4, 2015 CASE SUMMARY: The EHD and the Central Valley Regional Water Quality Control Board (CVRWQCB), in cooperation with CEMEX and SOMA have evaluated soil and groundwater conditions, and potential health concerns at the subject Site resulting from an unauthorized release of (gasoline, diesel, etc.) from an underground storage tank (UST) system. The unauthorized release from the UST system was discovered in January 1990. From January 1990 to June 1999, eight USTs containing either gasoline, diesel, waste oil, or asphalt were either removed or decommissioned in place by filling grout. At the current time, there is no active UST system on the Site. Soil and groundwater investigations were conducted from January 1990 to September 2013, to characterize impacted soil and/or groundwater. SOMA determined the extent of petroleum hydrocarbon impact to soil and groundwater. SOMA estimates that approximately 15,680 pounds of diesel is adsorbed between the surface and 20 feet below surface grade (bsg). However, no contamination was observed in groundwater during the most recent monitoring event of September 2013 and the soil contamination is limited to onsite areas only. Potential negative effects of the residual contamination on human health and the environment were evaluated by SOMA, and found to be negligible. On the basis of groundwater monitoring and the site characterizations, and the recommendation of SOMA, 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 receives and responds to the comments from CVRWQCB and 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 Victoria McCartney at the EHD. Ms. McCartney can be reached at (209) 468-9852, via e-mail at vmccartney@sjcehd.com, or in writing at 1868 East Hazelton Avenue. Stockton. California 95205.