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USA#110 • - 3 - • September 2012 <br /> Claim No. 6098 <br /> METHYL-TERT-BUTYL ETHER (MTBE) Results for MW-17 <br /> 35 <br /> 25 <br /> I <br /> 20 <br /> is <br /> 10 <br /> _ O <br /> •♦ <br /> _-4 'Ile "Oe Ile <br /> ♦ ♦♦ -__-� _....._ <br /> J"a <br /> .� METHYL-TERT-BUTYL ETHER(MTBE) —Trend <br /> Receptors <br /> • GW Basin: San Joaquin Valley— Eastern San Joaquin. <br /> • Beneficial Uses: Municipal and domestic water supply. <br /> • Land Use Designation: Commercial. <br /> • Public Water System: California Water Service. <br /> • Distance to Nearest Supply Well: According to data available in GeoTracker, there are <br /> nine CDPH regulated water supply wells within 1/2 mile of the site; the nearest well is <br /> 1,058 feet west from the Site. No domestic public supply wells have been identified. <br /> • Distance to Nearest Surface Water: No surface water noted within 1/2 mile from the Site. <br /> Risk Criteria <br /> • Estimate of Hydrocarbon Mass in Soil: None reported. <br /> • Soil/Groundwater Tested for MTBE: Yes, see table below. <br /> • Plume Length, Extent and Mobility: 125 feet, defined, decreasing in size and <br /> concentration. <br /> • Contaminated Zone(s) Used for Drinking Water: No. <br /> • Oxygen Concentrations in Soil Vapor: No data. <br /> • Indoor Vapor Risk from Residual Petroleum Hydrocarbons: No human health risk <br /> assessment noted in Geotracker. According to the recently approved low threat closure <br /> policy, it is unnecessary to conduct vapor migration risk assessments at active retail <br /> gasoline stations. <br /> • Direct Exposure Risk from Residual Petroleum Hydrocarbons: Site is paved, preventing <br /> exposure. <br /> Remediation Summary <br /> • Free Product: No free product was documented throughout the life of this case <br /> • Soil Excavation: 'Unknown <br /> • In-Situ Soil/ Groundwater Remediation: Soil vapor extraction pilot test conducted in <br /> October 1992. Soil vapor extraction and ozone sparging is pending. <br />