SITE INFORMATION AND CORRESPONDENCE FILE 2

Home Browse Search

u PUBLIC NOTICE Fact Sheet: February 20,2014 Case Closure for Leaking Underground Storage Tank(UST) Site 7-Eleven, Inc.,on behalf of the San Joaquin County Environmental Health Department (SJCEHD), invites public comment regarding the intent of the SJCEHD to grant regulatory closure for the leaking underground storage tank(LUST) case at the below subject site (Site). SUBJECT SITE: 7-11 Store #19976 1399 North Main Street, Manteca,San Joaquin County, California GeoTracker Global ID #T0607700750 SJCEHD Case Number: 1435 PUBLIC COMMENT PERIOD: 60 Days-February 20, 2014 through April 20, 2014 CASE SUMMARY: The SJCEHD, in cooperation with the property owners and responsible party (7-13even),and their environmental consultants has evaluated sol and groundwater conditions and health concerns at the Site resulting from historical unauthorized releases of gasoline from underground storage tank (UST) systems utilized for fueling operations at the Site prior to UST system upgrades in September 1996 and in June 2003. Soil and/or groundwater investigations were conducted from 1996 to 2013.Gasoline hydrocarbons have been detected in sol and groundwater beneath the Site.Active soil and groundwater remediation, including interim vapor extraction and oxygen injection, has reduced hydrocarbon mass to low concentrations in both the soil and groundwater. A vapor intrusion and human health risk assessment concluded that vapor intrusion of Site-related volatile chemicals does not pose a significant health risk to potential receptors in the 7-Eleven building or in the immediate vicinity of the Site. Based on existing soil and groundwater data, the Site is eligible for case closure as it fits the Low-Threat Underground Storage Tank Case Closure Policy (LTCP) criteria: • The dissolved petroleum hydrocarbon plume in groundwater has been mitigated to the extent feasible,and meets the characteristics set forth in the LTCP. • Exposure to petroleum vapors in indoor air is comparatively insignificant relative to exposures from small surface spills and fugitive vapor releases that typically occur at active fueling facilities. • Direct contact with impacted soil and inhalation of petroleum hydrocarbon vapors pose a low threat to human health, based on the thresholds listed in the LTCP. The SJCEHD concurs with the closure recommendation presented by 7-Eleven, Inc.and their environmental consultants.This fact sheet provides notification to the public of the pending case closure per requirements of the LTCP.The SJCEHD will consider any comments received during the public comment period when determining if the case should be closed or if Site specific conditions warrant otherwise. WHERE TO GET MORE INFORMATION Site information can be obtained from the GeoTrackerwebsite at: http://aeotracker.waterboards.ca.aov/. 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.sicehd.com. HOW TO PARTICIPATE Interested individuals have the opportunity to learn more about this case and its pending closure by submitting inquiries/comments to Ms.Vicki McCartney of the SJCEHD by April 20,2014.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.