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1 <br />Consent Decree Exhibit C <br />of 100 ppm in the buildings and enclosures accessible to the general public and 500 ppm in <br />enclosed spaces in the pavement, open space or undeveloped areas will lead to corrective <br />action to seal, block or otherwise stop the leak. Enclosed spaces in the pavement, open space <br />and undeveloped areas will not be accessible to the general public and will only be entered by <br />trained, qualified personnel using confined space entry procedures that include monitoring prior <br />to entry. Warning labeling on all such spaces will clearly identify restricted entry. Pavement <br />cracks will also be monitored and detections of flammable gas in excess of 500 ppm will lead to <br />corrective action to seal the crack. <br />Confirmational modeling at landfill gas discharge points would also be completed to confirm that <br />constituents of gas emitted from constructed discharge locations are consistent with the <br />assumptions of landfill gas pollutant concentrations and landfill gas flow used in the modeling to <br />design the future landfill gas control systems. <br />6.2.2 Groundwater Compliance Monitoring and Contingency Plan Objectives <br />Groundwater pathway inspection requirements for developed conditions include periodic <br />observation of leachate collection system, monitoring well head conditions, and stormwater <br />management facilities. <br />Compliance monitoring and contingency plans for developed conditions are identical to <br />compliance monitoring and contingency plans for existing conditions, except that the installation <br />of piles through the aquitard will impact the timing and/or duration of performance and/or <br />confirmational monitoring. The ten-year minimum period for performance monitoring will be <br />reset after the first pile installation event that penetrates the aquitard. If confirmational <br />monitoring has begun before development, performance monitoring will be reinstated following <br />the first pile installation event that occurs in an area underlain by aquitard. Additional pile <br />installation events will reset performance monitoring only if piles were installed in a zone <br />designated for restricted pile installation. <br />6.2.3 Direct Contact Compliance Monitoring and Contingency Plan Objectives <br />Direct contact pathway inspection requirements for developed conditions will include periodic <br />inspection of developed area covers, access controls for undeveloped portions of the Site, and <br />construction activities. <br />Quarterly inspections of developed area cover conditions will record and direct repair of areas of <br />pavement penetrations or cracking, landscaped area erosion or holes, and building <br />subbasement floor conditions that might result in exposure to buried materials. Access controls <br />to undeveloped portions of the Site will be monitored and repaired if found compromised. Signs <br />of erosion or unauthorized digging in undeveloped portions of the Site will also be recorded and <br />repaired. <br />Regular inspection of construction activities will ensure compliance with special construction <br />requirements, including, but not limited to, odor, dust and erosion controls, dewatering <br />procedures, and health and safety requirements for workers. <br />All compromises of cover requirements and access controls will be rectified within a reasonable <br />timeframe. Instances of a contractor's failure to meet construction requirements will be <br />recorded and rectified accordingly. <br />FINAL - March 2001 6-5 Everett Landfill Tire Fire Site <br />Cleanup Action Plan <br />1 <br />