SITE INFORMATION AND CORRESPONDENCE

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I I San Joaquin County Environmental Health Department DIRECTOR ?• ' -_++�` ' P Linda Turkatte, REHS 1868 East Hazelton Avenue Stockton , California 95205-6232 PROGRAM COORDINATORS Robert McClellon, REHS _ Jeff Carruesco, REHS, RDI • � Cq' Cj�P Website: wwwsjgov, org/ehd Kasey Foley, REHS c , F ° R - Rodney Estrada, REHS Phone : 209 ( ) 4683420 Adrienne Ellsaesser, REHS Fax: (209) 464-0138 i PUBLIC NOTICE Fact Sheet Pending Case Closure for Leaking Underground Storage Tank Site The San Joaquin County Environmental Health Department (EHD) invites public comment regarding consideration by the EHD to grant regulatory case closure for the leaking underground storage tank (LUST) case at the subject site (Site) identified below: SUBJECT SITE: Site Name: Country Market GeoTracker Global ID No . : T10000004612 Site Address: 10476 W. Linne Road, Tracy EHD Site Code: 2070 PUBLIC COMMENT PERIOD: 60 Days — from April 27, 2015 to June 26, 2015 CASE SUMMARY: The EHD, in consultation with the Central Valley Regional Water Quality Control Board (CVRWQCB) , has considered the findings and recommendations provided in reports of investigation prepared by Antea Group (Antea) on behalf of Mr. John Muniz, Jr. , property owner and responsible party. Under the regulatory oversight of the EHD, Antea has investigated the impact on soil and groundwater, and has compared the results to contaminant concentration limits established in various authoritative guidance documents in regard to potential health concerns at the subject Site related to an unauthorized release (UAR) of gasoline from an underground storage tank (UST) system formerly located on the site. The UAR from the UST system was discovered in November 2012 when the tanks were removed . The soil and groundwater investigations were conducted from November 2012 to February 2014. Currently there is no active UST system on the Site. As a result of their investigations, Antea has concluded that the petroleum hydrocarbons reported in soil during the UST removals are limited in lateral and vertical extent and do not threaten groundwater and are not a source of groundwater contamination; the onsite sensitive receptor (domestic water well) has not been impacted; the secondary source of residual petroleum hydrocarbons in soil is minimal and likely to naturally attenuate within a reasonable time period; in the absence of free product and benzene in soil and groundwater, vapor intrusion to indoor air is not considered a threat to human health on the site; and the lack of benzene and detection of ethylbenzene in only one soil sample within the upper 10 feet of soil suggests there is little risk to human health or the environment from direct contact or exposure to outdoor air. Antea has recommended that the site (case) be closed and no further action (be) required. No estimate of the residual contaminant mass in soil was made, but the limited data is consistent with a minor mass in soil that is not likely to have migrated offsite. Antea has concluded that natural attenuation is the most cost-effective remedial technology to employ to complete remediation for the small residual mass on the site. No estimate of time for contaminant masses or concentrations to achieve background levels was provided .