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arale Farms` � = 3.-_ _ ._. r �-. - ---�< September 2412 <br /> - —� <br /> Claim.No-17509 <br /> Receptors <br /> • GW Basin: San Joaquin Valley—Tracy. 3 <br /> • Beneficial Uses: None specified, deeper aquifer(s) used for drinking water supply. <br /> • Land Use Designation: None specified, aerial photo show site is agricultural.; <br /> • Public Water System: None. <br /> • Distance to Nearest Supply Well: According to data available in GeoTracker,,there are <br /> no CDPH regulated water supply wells within "/ mile of the site. County recently <br /> identified a nearby domestic well, less than 350 feet of the source area. <br /> • Distance to Nearest Surface Water: Irrigation canals near site on all sides. <br /> Risk Criteria <br /> Estimate of Hydrocarbon Mass in Soil: Mass estimate of 256 pounds of TPHg in site soil <br /> and 12.26 pounds dissolved in groundwater(AGE, 2012). <br /> • Soil/Groundwater Tested for MTBE: Yes, see table below. <br /> • Plume Length, Extent and Mobility:- 120 feet, defined, decreasing in size and. <br /> concentration. ' <br /> • Contaminated Zone(s)_Used for.Drinking Water:_No...,,,. —. - <br /> • Oxygen:Concentrations in Soil! VaporNo <br /> • Indoor Vapor Risk from Residual Petroleum Hydrocarbons: Potential for vapor migration <br /> risk; benzene concentrations exceed 1,000 ug/L and depth to groundwater is 5 feet. <br /> • Direct Contract Risk from Residual Petroleum Hydrocarbons: Site is unpaved, direct <br /> contact risks are unknown. i <br /> Remediation Summary <br /> • Free Product: No free product Was documented'throughout the life of this case. <br /> • Soil Excavation: An unknown of impacted soil was removed and disposed offsite in <br /> 1992. , <br /> • In-Situ Soil/ Groundwater Remediation: No remediation has been conducted, in-situ <br /> chemical oxidation pilot test proposed in an August 2010 work plan. <br /> 1 . <br /> :f' ry <br />