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Mr. John T. Verner <br /> December 12, 1991 <br /> Page 4 <br /> contact with arsenic contaminated soil were not considered <br /> further as exposure pathways in the Risk Assessment. <br /> The remaining exposure pathways (inhalation of VOC <br /> emissions from the North Country Squires soil, VOC emissions <br /> from the Sharpe Site soil, and VOC emissions from the Sharpe <br /> Site air strippers) were evaluated in the Risk Assessment. The <br /> exposure assessment modeling predicted maximum air <br /> concentrations of VOCs from the North Country Squires property <br /> and the Sharpe Site. These concentrations levels present an <br /> individual excess lifetime cancer risk of less than one in a <br /> million to future residents at the development site. <br /> Generally, the Department does not consider excess cancer risks <br /> of 10-6 or less to pose a significant health hazard. <br /> Therefore, we conclude that no significant health impacts will <br /> result from long term inhalation of VOCs from the North Country <br /> Squires property and/or the Sharpe Site by future residents of <br /> North Country Squires. <br /> If you have any questions concerning remediation measures <br /> at the Sharpe Site, please contact Tracie Billington, Region 1 <br /> Office, at (916) 855-7873 . If you have any questions <br /> regarding this letter or border zone issues, please <br /> contact Allen K. Wolfenden, Chief, Technical Services Branch, <br /> at (916) 445-7410. <br /> Sincerely, <br /> 2/ / /2 <br /> Ted N. Rauh <br /> Acting Deputy Director <br /> Enclosure <br /> cc: See next page. <br />