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+.. Work Plan for Refined Plume Definition and Management of Floating Product-7500 W 11th St., Tracy, CA. Page 84 <br /> �. 14.0 SITE CLOSURE <br /> '4 When floating-product has been removed from the subsurface beneath the site and sufficient <br /> data has been established from the groundwater-quality monitoring program has been <br /> compiled to demonstrate that the concentrations of analytes of concern in the plume of <br /> contaminated groundwater are sufficiently low and that the trend of those concentrations with <br /> i., time is declining, additional samples will be recovered from the monitoring well array so that <br /> the geochemistry and the biochemistry of the groundwater can be evaluated to determine the <br /> mechanisms by which and the rates at which processes of intrinsic, natural remediation, <br /> including bioremediation, are eliminating components of fuel hydrocarbons remaining in the <br /> groundwater. <br /> �.. Following that investigation a Tier 1, or, as applicable, a Tier 2, human health and <br /> environmental risk assessment will be performed for the site in accordance with the policies <br /> and procedures established by the USEPA (United Sates Environmental Protection Agency <br /> 1989a). The human health and ecological risk assessments will be performed in compliance <br /> with the then current issues of ASTM Practice Standards PS-104 ND and E-1739-95 <br /> (American Society for Testing and Materials 1998, 2000a). <br /> If the results of the risk-based analyses show that the subsurface conditions at the 7500 West <br /> Eleventh Street site pose no more than an acceptable risk to human health or the <br /> environment, the results of the site characterization work and programs of groundwater <br /> quality remediation that have been conducted there will be documented in an engineering <br /> report that will include details of the procedure and data used to prepare the Tier 1 or Tier 2 <br /> risk assessments. That report will be submitted to SJCEHD and the RWQCB in support of an <br /> application for site closure. <br /> 14.1 Estimated Cost <br /> SJC has prepared an engineer's estimate for final site closure. The estimate is detailed as <br /> Task 9 of Appendix A and is summarized below. <br /> Site Closure Cost (Task 9)* $65,500 <br /> (Including final round <br /> of groundwater-quality monitoring, <br /> evaluation of intrinsic remediation, <br /> Tier 2 Human Health and Ecological <br /> Risk Assessment, closure of all wells <br /> and engineering closure report.) <br /> * Estimate can be reduced by $30,000.00 if no Tier 2 Human Health and Safety and <br /> Environmental Risk Assessment is required. <br /> SJC <br />