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Comfort Air • . October 2013 <br /> 1607 Turnpike Road, Sto kton <br /> Claim No: 15533 <br /> Rationale for Closure uder the Policy <br /> • General Criteria: ihe case meets all eight Policy general criteria. <br /> • Groundwater Specific Criteria: The case does not meet Policy criteria because the extent <br /> of groundwater co itarnination is undefined south (downgradient) of MW-813. <br /> • Vapor Intrusion to Indoor Air: The case does not meet Policy criteria because the <br /> maximum benzene concentration in groundwater is greater than 1,000 pg/L and the <br /> minimum depth to groundwater is less than 30 feet. <br /> • Direct Contact an Outdoor Air Exposure: This case meets Policy Criterion 3b. Although <br /> no document title "Risk Assessment' was found in the files reviewed, a professional <br /> assessment of sit -specific risk from potential exposure to residual soil contamination found <br /> that maximum co entrations of petroleum constituents remaining in soil will have no <br /> significant risk of E dversely affecting human health. Excavation was conducted to ten feet. <br /> The Site is paved ind accidental exposure to site soils is prevented. <br /> Recommendation <br /> The Fund recommends th 3t the County direct the Responsible Party to define the extent of <br /> groundwater contaminate south (downgradient) of MW-86 and to implement an effective soil and <br /> groundwater treatment tec hnology to achieve Policy guidelines in a timely manner. <br /> Kitk Larson, P.G. Date Robert Trommer, C.H.G. Date <br /> Engineering Geologist Senior Engineering Geologist <br /> Technical Review Unit Chief, Technical Review Unit <br /> (916) 341-5663 (916) 341-5684 <br /> Page 2 of 13 <br />