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No M <br />CONSENT DECREE EXHIBIT D <br />EVERETT LANDFILUTIRE FIRE SITE <br />Development Components <br />Environmental Requirements <br />City Review Comments <br />and submittal reference <br />ie page, sheet # <br />Ecology Review <br />Continents <br />I Leavy structures with pile <br />Pile supported structures are anticipated at the Site. Either driven or <br />❑ Approved as submitted <br />❑ Resubmit as noted <br />supported foundations <br />drilled pile types may be installed, following implementation of the <br />groundwater compliance monitoring program and completion of <br />evaluation re: potential zones of pile -type restrictions. Piles to <br />support structures would be installed through refuse, through the <br />underlying clay and peat layers into bearing sands. Piling or <br />foundations that penetrate the gas barrier layer shall be booted or <br />sealed to the barrier layer. <br />Some areas of the Site may be restricted to augercast type pile <br />construction. This determination will be made following additional <br />shallow aquifer sampling and evaluation. <br />Potential basement or below <br />Excavation requirements are listed under "Construction Disruption" <br />❑ Approved as submitted <br />grade parking areas. <br />requirements above. <br />❑ Resubmit as noted <br />(gas controls beneath <br />Particular care should be given to design of utility and pavement <br />buildings <br />connections at the interface of pile supported buildings and <br />surrounding Site areas, where significant differential settlement is <br />expected. Buildings will be protected by a geoniernbrane beneath <br />the foundation slab that is booted and sealed around piles and utility <br />penetrations. <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 buildings, <br />extraction piping would be installed in development fill or slab <br />subgrade — above refuse. The extraction piping will be connected to <br />header pipes, a vacuum source and a discharge location. A Dull -time <br />continuous ground floor methane monitoring system will be <br />installed in all buildings. Methane concentrations exceeding 1,000 <br />ppm will automatically activate the building's I1VAC system and <br />notify operations personnel. Methane concentrations exceeding <br />10,000 ppm will activate audible alarms and trigger building <br />evacuation. Monitoring with a hand held sensor would be used to <br />identify any locations with methane exceeding I00ppm for repair. <br />Temporary enclosures erected over pavement or open space areas <br />will contain continuous methane monitors that would activate an <br />alarm if triggered. <br />City / Ecology Development Review Checklist Exhibit D Page 11 of 13 <br />