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r <br /> NOTIFICATION TO PROPERTY OWNERS AND/OR TENANTS <br /> FACT SHEET <br /> And <br /> REQUEST FOR COMMENTS TO PROPOSED CASE CLOSURE <br /> The former Tony Gonzales Trucking Facility (Site) is located at 1855 Jackson Avenue in <br /> Escalon. The Site is currently a residence and has not operated as a fueling facility since <br /> 1988. On March 31, 1988 Garner Construction of Oakdale, California removed three <br /> underground storage tanks, one 10,000-gallon diesel, one 1,000-gallon gasoline and one <br /> 500-gallon diesel from the Site. Soil samples were collected from the tank excavation area <br /> and analyzed for the presence of total petroleum hydrocarbons as gasoline (TPHg), diesel <br /> (TPHd), kerosene, motor oil, lead, and benzene, toluene, ethylbenzene and total xylenes <br /> (BTEX). Laboratory results showed the presence of TPHd, lead, toluene, and xylenes in the <br /> excavation area. <br /> Additional soil and groundwater testing was performed between 2000 and 2002. Laboratory <br /> analysis indicated a limited area of soil showed the presence of TPHg, TPHd, and BTEX. <br /> These hydrocarbons were not detected in groundwater. A fate and transport model <br /> (SESOIL) was submitted in 2007 concluding that no significant impacts on the quality or <br /> beneficial uses of groundwater are reasonably expected from the residual hydrocarbons in <br /> the vadose zone at the Site. <br /> A groundwater investigation and soil gas survey were performed in 2007 to determine the <br /> validity of the fate and transport model. The groundwater analytical results indicate <br /> groundwater has not been impacted and validates the results of SESOIL model. Soil vapor <br /> results do not exceed residential San Francisco Bay Regional Water Quality Control Board <br /> Environmental Screening Levels. Soil vapor results were below California Human Health <br /> Screening Levels (CHHSL) with the exception of benzene. A TIER 2 risk evaluation was <br /> performed and the vapor intrusion and health risk modeling indicates insignificant health <br /> risk. There are no supply wells within 1,200 feet of the Site. Therefore, the residual <br /> hydrocarbon mass in soil is unlikely to pose a threat to human health or waters of the State. <br /> The Regional Water Quality Control Board — Central Valley Region is evaluating the Site <br /> for closure as a low risk site, and is inviting comments on the proposed closure for the Site. <br /> This notification is being sent to the owners and/or tenants located within 250 feet of the <br /> Site.--All comments and/or-questions-should--be-directed-to #Ir-.-Barton of the Regional <br /> Water Quality Control Board—Central Valley Region: <br /> AGENCY CONTACT CONSULTANT CONTACT <br /> Regional Water Quality Control Board- Ground Zero Analysis,Inc. <br /> Central Valley Region <br /> James L. L. Barton,PG Eric L. Price,PG <br /> 11020 Sun Center Drive#200 1714 Main Street <br /> Rancho Cordova, CA 95670-6114 Escalon,CA 95320 <br /> (916)464-4615 office (209) 838-9888 office <br /> (916)464-4645 fax (209) 838-9883 fax <br /> jbarton@waterboards.ca.gov e rice groundzeroanalysis.com <br />