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Mr. John Verner • • <br /> Page 2 <br /> dermal contact with arsenic contaminated soil were not considered <br /> exposure pathways in the Risk Assessment. <br /> Although there are relatively high levels of arsenic in soil <br /> samples at SHAD, these samples generally are at the subsurface, <br /> which would not contribute to airborne arsenic levels. <br /> Therefore, arsenic from SHAD was also eliminated from further <br /> consideration as an exposure pathway. <br /> Ingestion of potentially contaminated water from Valley Haven was <br /> not considered as an exposure pathway because you have indicated <br /> that no ground water will be used for drinking, irrigation, or <br /> recreation. As specified in the Conditions of Approval, (Valley <br /> Haven Vesting Tentative Map approved by the San Joaquin County <br /> Planning Commission on January 7, 1988) , connection to an <br /> approved public water and sewer system is required. The <br /> Department recommends that these restrictions are met. The <br /> Department also recommends that the following Conditions, <br /> Covenants, and Restrictions proposed in your letter of <br /> November 17, 1987, and as modified by the Department, be adopted <br /> and recorded: <br /> Conditions, Covenants, and Restrictions <br /> 1) No owner or occupant of this subdivision shall extract, <br /> utilize, consume or permit to be extracted any water from <br /> below the surfaces of the ground without prior approval from <br /> the local Health District and the Department of Health <br /> Services. <br /> 2) All water utilized within this subdivision for any purpose <br /> shall be obtained from a municipal water source. <br /> 3) No owner or occupant shall dig, create or utilize a septic <br /> tank or any other sub-surface waste disposal system without <br /> prior approval from the local Health District and the <br /> Department of Health Services. <br /> 4) Prior to construction of the Valley Haven subdivision, all <br /> existing wells shall be abandoned pursuant to all applicable <br /> state and local regulations. <br /> The remaining potential exposure pathways (inhalation of VOC <br /> emissions from Valley Haven soil, VOC emissions from SHAD soil, <br /> and emissions from the SHAD air stripper) were evaluated in the <br /> Risk Assessment. The exposure assessment modeling predicted air <br /> concentrations of VOCs from Valley Haven and SHAD. These <br /> concentrations are lower than health risk values which include: <br /> 1) the most current evaluations of data prepared by the <br /> Environmental Protection Agency in the Integrated Risk <br />