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1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />Consent Decree Exhibit C <br />Table 6-1 (continued) <br />Remedial Actions for Development Components <br />Development <br />Components <br />Remedial(Cleanup) Actions <br />Buildings <br />Potential light structures with <br />If design of structures can address seismic stability concerns, light structures with <br />shallow foundations. <br />shallow foundations would be allowed. <br />Heavy structures with pile <br />Pile supported structures are anticipated at the Site. Either driven or drilled pile types <br />supported foundations <br />may be installed, following implementation of the groundwater compliance monitoring <br />program and completion of evaluation re: potential zones of pile -type restrictions. Piles <br />to support structures would be installed through refuse, through the underlying clay and <br />peat layers into bearing sands. Piling or foundations that penetrate the gas barrier <br />layer shall be booted or sealed to the barrier layer. <br />Some areas of the Site may be restricted to augercast type pile construction. This <br />determination will be made following additional shallow aquifer sampling and <br />evaluation. <br />Potential basement or below <br />Excavation requirements are listed under "Construction Disruption" requirements <br />grade parking areas. <br />above. <br />Particular care should be given to design of utility and pavement connections at the <br />interface of pile supported buildings and surrounding Site areas, where significant <br />differential settlement is expected. <br />Buildings will be protected by a geomembrane beneath the foundation slab that is <br />booted and sealed around piles and utility penetrations. <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 buildings, extraction piping would be installed in development fill or slab <br />subgrade — above refuse. The extraction piping will be connected to header pipes, a <br />vacuum source and a discharge location. A full-time continuous ground floor methane <br />monitoring system will be installed in all buildings. Methane concentrations exceeding <br />1,000 ppm will automatically activate the building's HVAC system and notify operations <br />personnel. Methane concentrations exceeding 10,000 ppm will activate audible alarms <br />and trigger building evacuation. Quarterly monitoring with a hand held sensor would be <br />used to identify any locations with methane exceeding 100ppm for repair. <br />Temporary enclosures erected over pavement or open space areas will contain <br />continuous methane monitors that would activate an alarm if triggered. <br />Continued on following page. <br />FINAL - March 2001 <br />Table Everett Landfill Tire Fire Site <br />6-1 Cleanup Action Plan <br />