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1 <br />Consent Decree Exhibit C <br />* Health and safety requirements for construction crews <br />* Construction dewatering procedures <br />* Construction performance monitoring, inspection and contingency plans. <br />The requirements for construction are described in more detail in Table 6-1. <br />• Controlled on -site relocation and re -capping of excavated refuse during construction <br />activities is allowed. Location and quantities will be approved prior to excavation. <br />Surface Water Pathway: <br />• A SWPPP for future conditions will be developed in order to manage storm water <br />run-off quality and quantity for off -site discharge. <br />• Comprehensive compliance monitoring and maintenance inspection commitments <br />are required. <br />6.1 PHYSICAL CHARACTERISTICS <br />The physical characteristics of the recommended cleanup alternative for future conditions <br />include construction and operation requirements for the potential future developed areas of the <br />Site. These remedial actions are listed in detail in Table 6-1. <br />6.2 COMPLIANCE MONITORING AND CONTINGENCY PLAN OBJECTIVES <br />Compliance monitoring plans will be implemented for landfill gas, groundwater, direct contact <br />and surface water. Compliance monitoring for developed conditions includes both inspection <br />requirements to ensure that developed conditions remain in compliance with environmental <br />objectives, and compliance monitoring iD ensure that the exposure pathway receptors are not <br />affected by development at levels of concern. See the CMCP for more detail. <br />6.2.1 Landfill Gas Compliance Monitoring and Contingency Plan Objectives <br />Compliance monitoring will be implemented for buildings, pavement, open space, and <br />undeveloped areas. Buildings will include continuous monitoring systems for all ground floor <br />rooms that will automatically notify appropriate operations and maintenance personnel and <br />activate increased interior HVAC system ventilation if flammable gas was detected at 1,000 ppm <br />within the building. If flammable gas concentration reached 10,000 ppm, alarms will be <br />activated that will cause the building to be evacuated. <br />Buildings and exterior areas will be monitored with hand-held instruments every two weeks after <br />the building and/or exterior area is opened for public access. If results do not show an air <br />quality concern for three months, monitoring will be performed quarterly. Monitoring will be <br />conducted by a trained, qualified technician using a hand-held flammable gas meter capable of <br />detecting flammable gas at less than 100 ppm. This technician will monitor buildings to locate <br />sources of landfill gas intrusion by measuring cracks, utility penetrations, and the like. The <br />technician will also monitor enclosed spaces such as utility vaults, catch basins, and manholes <br />in pavement, open space and undeveloped areas. Any detections of flammable gas in excess <br />FINAL - March 2001 6-4 Everett Landfill Tire Fire Site <br />Cleanup Action Plan <br />1 <br />1 <br />1 <br />1 <br />fl <br />1 <br />1 <br />1 <br />1 <br />L� <br />1 <br />1 <br />1 <br />1 <br />i <br />f <br />1 <br />