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CONSENT DECREE EXHIBIT D <br />EVERETT LANDFILL/TIRE FiRE SITE <br />Development Components <br />Environmental Requirements <br />City Review Comments <br />and submittal reference <br />ie page, sheet # <br />Ecology Review <br />Comments <br />Open Space / Landscaping <br />Landscaped areas around <br />Landscaped or open space areas will be constructed with a low <br />❑ Approved as submitted <br />buildings and parking areas. <br />permeable hydraulic barrier underlying clean soil established with <br />❑ Resubmit as noted <br />vegetation to prevent erosion. hydraulic barriers should obtain <br />permeability similar to that of asphalt pavement. institutional <br />Recreational use/park areas <br />controls and property management procedures are required to <br />and trails. <br />prevent unauthorized digging and potential disturbance of hydraulic <br />barrier. <br />Subdrainage is required above the hydraulic barrier, to collect <br />drainage above the barrier for off -site discharge. In landscaped <br />areas where it is impracticable to connect with the storm water <br />system for discharge, a drain may be placed in the hydraulic barrier <br />to allow infiltration into the landfill, as long as it does not <br />compromise gas collection system effectiveness. <br />Phased active gas controls will be installed continuously below <br />developed areas, including perforated extraction piping in gravel <br />trenches, spaced a maximum of 100' on center. Below landscaped <br />areas, extraction piping would be installed in development fill below <br />the hydraulic barrier — above refuse. The extraction piping will be <br />connected to header pipes, a vacuum source and a discharge <br />location. Quarterly surface monitoring with a hand held sensor <br />would be used to identify any locations with methane exceeding 500 <br />ppm for repair. <br />Fence posts shall either be finished above the underlying gas barrier <br />or, if penetrating the gas barrier, be internally scaled and booted to <br />the barrier layer to preclude intrusion of landfill gas. <br />A Stormwater Pollution Prevention Plan and routine inspection of' <br />open space areas will be required to ensure cap integrity is not <br />compromised by erosion. <br />City / Ecology Development Review Checklist <br />Exhibit D Page 12 of 13 <br />M M M M M M M M r M M M r M M M M M M <br />