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Consent Decree Exhibit C <br />Table 6-1 (continued) <br />Remedial Actions for Development Components <br />Development <br />I <br />Components <br />Remedial(Cleanup) Actions <br />Landscaped or Open Space Areas <br />Landscaped areas around <br />Landscaped or open space areas will be constructed with a low permeable hydraulic <br />buildings and parking areas. <br />barrier underlying clean soil established with vegetation to prevent erosion. Hydraulic <br />barriers should obtain permeability similar to that of asphalt pavement. Institutional <br />controls and property management procedures are required to prevent unauthorized <br />Recreational use/park areas <br />digging and potential disturbance of hydraulic barrier. <br />and trails. <br />Subdrainage is required above the hydraulic barrier, to collect drainage above the <br />barrier for off -site discharge. In landscaped areas where it is impracticable to connect <br />with the storm water system for discharge, a drain may be placed in the hydraulic <br />barrier to allow infiltration into the landfill, as long as it does not compromise gas <br />collection system effectiveness. <br />Phased active gas controls will be installed continuously below developed areas, <br />including perforated extraction piping in gravel trenches, spaced a maximum of 100' on <br />center. Below landscaped areas, extraction piping would be installed in development <br />fill below the hydraulic barrier — above refuse. The extraction piping will be connected <br />to header pipes, a vacuum source and a discharge location. Quarterly surface <br />monitoring with a hand held sensor would be used to identify any locations with <br />methane exceeding 500 ppm for repair. <br />Fence posts shall either be finished above the underlying gas barrier or, if penetrating <br />the gas barrier, be internally sealed and booted to the barrier layer to preclude intrusion <br />of landfill gas. <br />A Stormwater Pollution Prevention Plan and routine inspection of open space areas will <br />be required to ensure cap integrity is not compromised by erosion. <br />Public Access <br />Unlimited public access in <br />Public will be allowed access to all developed areas of the Site, except controlled entry <br />developed areas. <br />to confined spaces and maintenance corridors. Warning signage may be placed as <br />appropriate. Landfill gas controls must be installed and operational in developed areas <br />for public access. <br />Access restrictions to <br />Perimeter fencing with secured entries will restrict access to undeveloped portions of <br />undeveloped areas. <br />the Site. <br />FINAL - March 2001 Table Everett Landfill Tire Fire Site <br />6-1 Cleanup Action Plan <br />