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Washington County Landfill Remedy Feasibility Assessment Date: 1 1 / l 5/07 Executive Summary Short Elliott Hendrickson Inc. (SEH ") has prepared tlus Remedy feasibility Assessment (RFA) Report for the closed Washington County Landfill at the request of the Minnesota Pollution Control Agency (MICA). The landfill is located within the city limits of Lake Elnlo in Washington County, Minnesota. The original permitted area was 110 acres i.tl size with a fill area of approximately 35 acres. Ierfluorocliemieals (PFCs) have been identified in groundwater at levels above the Minnesota Department of Health (MDH) groundwater and toxicological limits known as Health Risk Limits (I-IRLs). In addition to PFCs, several volatile organic compounds (VQCs) have also been identified in the groundwater at concentrations exceeding their respective ITRL- An existing spray irrigation system installed at the site has historically been successful in treating VC)C impacted water recovered from the site groundikater extraction wells. However, the spray irrigation system is not providing effective treatment of the PFC constituents. The RFA provides an independent feasibility review of the six potential remedies selected by the N4PCA to address contamination presence and migration related primarily to PFC compounds associated with the site. The six potential remedial options that the MPCA requested S1=H evaluate are: • No Additional Action • Plasma Torch • Force main (groundwater extraction with off -site disposal) • Pump and Treat 44round%vater extraction with treatment or Infiltration Oil -site) • Dig ail(] Truck • Dig" and Line Based on available site inforillation. remedial technoloLy evaluations by others, all(] SFI-I's experience at 5irllilar nlurdicijla) landil sites. I Ik has assessed the remedial acoon Options against the following seveil evaluation criteria: • t)verall protection Of human health and the erlvironinern • C:ottlpliaticc with Applicable i:rr Relevant and Appropriate Require illents • Long-term effectiveness and perfclrinance • Reduction Of taxicity, mobility, or vOlurlle (TMV) through treatment • Short-term effectiveness • lmplementability • Cost No :Additional :action The "No Additional Action" alternative is evaluated to provide a baseline for public health and welfare and envirownental consequences of taking no further remedial action at the site. This alternative was initially labeled by N41'C:`A as the "do nothing' alternative; however, since some remedial activities will continue at the site with this alternative. S1 1I charlLedl file name to more accuralely reflect the approach. It is underst6od that the existing remedial and mi�tlitOlin11' efli011 NVOUld ccintinile; ho ever, fiirthcr invt liLation and or renledialion with regards to PFC s would cease. A-MNPCA0802.00