Laserfiche WebLink
1 <br />Consent Decree Exhibit C <br />1 <br />1 <br />1 <br />IJ <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />FJ <br />1 <br />1 <br />The proposed cleanup action for gas can be implemented. Existing building control measures <br />have been and will continue to be implemented including corrective actions and compliance <br />monitoring. The perimeter landfill gas compliance monitoring probes will be installed as soon as <br />possible pending investigation and necessary approvals. <br />There are no known or anticipated public concerns that this cleanup action does not address. <br />The proposed cleanup action for gas thus meets all the criteria to be considered "permanent to <br />the maximum extent practicable". <br />The alternative "Excavate and Remove Landfilled Materials" was rejected. Because this <br />alternative has been evaluated for multiple pathways, please see Section 7.9 for justification. <br />The other alternative, which requires immediate installation of perimeter landfill gas migration <br />controls, was rejected because existing landfill gas monitoring data does not allow appropriate <br />evaluation of whether or not landfill gas may be migrating beyond the Site boundary. <br />Installation of new perimeter probes is required for this evaluation. Compliance monitoring of <br />the new perimeter probe network may never show an exceedance of regulatory standards <br />beyond the Site boundary. The preferred alternative allows the City to incur the estimated $0.9- <br />1.9 million for perimeter migration controls only if the necessity of these controls is confirmed. <br />5.2.2 Provide for Reasonable Restoration Time Frame <br />The proposed cleanup action for gas may result in some lag between determination of a <br />potential regulatory exceedance at the Site boundary and construction of associated perimeter <br />controls. However, temporary vacuum extraction wells could control landfill gas migration within <br />the vicinity of where migration is occurring in the interim if necessary. Thus, immediate <br />installation of perimeter landfill gas migration control alternative offers no substantial advantage <br />over the proposed cleanup action relative to implementation time frame. <br />5.2.3 Consider Public Concerns Raised during Public Comment on the Draft Cleanup <br />Action Plan <br />Public concerns are unknown at this time. The public has not had an opportunity to comment <br />on the draft cleanup action plan as of this date. Evaluation of the alternatives against this <br />criterion can be done after such comments are received. <br />5.3 CLEANUP ACTION ALTERNATIVES FOR SURFACE WATER <br />The proposed cleanup action for existing conditions includes compliance monitoring and source <br />identification, maintenance of the landfill cover depth and slope, inspection and control of <br />leachate seeps, and preparation of a SWPPP. The only alternative to the proposed cleanup <br />action included all the components listed above except for the preparation of a SWPPP for <br />existing conditions. <br />FINAL - March 2001 5-3 Everett Landfill Tire Fire Site <br />Cleanup Action Plan <br />1 <br />