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Roek Construction -4 - September 2012 <br /> Claim No. 7881 <br /> • Distance to Nearest Supply Well: According to data available in GeoTracker, there are <br /> 12 CDPH regulated water supply wells within 1/ mile of the site, the nearest well is 844 <br /> feet south from the Site. No domestic public supply wells have been identified. <br /> • Distance to Nearest Surface Water: McLeod Lake lies 1 mile to the west. <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: >300 feet, undefined, moving downgradient. <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: Soil vapor survey and <br /> human health risk assessment was conducted in November 2009. Passed Tier 2 risk <br /> assessment. <br /> • Direct Exposure Risk from Residual Petroleum Hydrocarbons: Site is paved preventing <br /> direct exposure <br /> Remediation Summary <br /> • Free Product: No free product was documented throughout the life of this case <br /> • Soil Excavation: An unknown volume of impacted soil were removed and disposed <br /> offsite in 1988. <br /> • In-Situ Soil Remediation: Soil vapor extraction, conducted from November 1997 through <br /> June 2002 removed approximately 13,199 pounds of TPHg. <br /> • Groundwater Remediation: Batch hydrogen peroxide injection, events in Nov 2010, <br /> Dec 2010, Mar 2011, May 2011, 1 June 2011, and 27 June 2011. Approximately <br /> 5,094 gallons of H202injected into the subsurface. <br />