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1 <br />The City of Everett <br />The Floyd & Snider Team Everett Landfill/Tire Fire Site <br />Performance Monitoring well network. Shallow monitoring wells will not be sampled for <br />chemical content, as long as compliance is based on effective collection of the leachate for <br />treatment. If, however, shallow aquifer compliance based on cleanup levels is desired in order <br />to determine if and when the leachate collection system could be shut down in the future, <br />chemical monitoring of select shallow wells would be proposed in the Performance Monitoring <br />plan. <br />At the time of this report there are no plans to implement shallow aquifer water quality <br />monitoring. Therefore, only shallow wells located along the leachate collection system and <br />northern site boundary that provide useful hydraulic gradient information will be monitored (e.g. <br />MW-24, 25, 26, 27 and 22). Evaluation Monitoring results may also indicate the necessity for <br />additional monitoring wells in locations not adequately covered by the proposed new and <br />existing wells. The Evaluation Monitoring sampling and analysis plan (SAP) will be modified to <br />reflect all changes that are implemented for Performance Monitoring. Such modifications may <br />include a description of the revised monitoring well network and revisions to the list of COCs. <br />Performance Monitoring will be reset or reinstated after the first pile installation activity occurs <br />on the site. Additional pile installation activities will reset or reinstate Performance Monitoring <br />only if such pile installation occurs in a zone identified for pile restrictions. If such restricted pile <br />installation occurs, the ten-year minimum Performance Monitoring requirement will be reset <br />following pile installation. <br />4.5.1.1 Water Elevation Monitoring <br />Water elevations in all monitoring wells in the Performance Monitoring well network and surface <br />r <br />water bodies will continue to be recorded throughout Performance Monitoring. <br />4.5.1.2 Sampling Methods <br />Sampling methods for Performance Monitoring will be consistent with those used for Evaluation <br />Monitoring. <br />4.5.1.3 Sampling Parameters <br />Analytical methods will include those appropriate to detect identified COCs. Specific <br />compounds will be identified in the Performance Monitoring sampling and analysis plan. <br />Shallow monitoring wells will not be sampled for chemical criteria after Evaluation Monitoring <br />unless, as described above, shallow aquifer compliance based on cleanup levels is desired in <br />order to determine if and when the leachate collection system could be shut down. <br />4.5.2 PERFORMANCE MONITORING SCHEDULE <br />Performance monitoring will be conducted semi-annually at all Performance Monitoring network <br />wells for a minimum of ten years under existing conditions. Under potential future conditions <br />created by site development, the duration of Performance Monitoring will depend on the phasing <br />of development. The ten-year minimum Performance Monitoring period will be reset or <br />reinstated after the first significant pile installation activity occurs on the site. Additional pile <br />installation activities will reset or reinstate Performance Monitoring only if such pile installation <br />dots ects Hance R Everett LandtiMCP maker - final Compliance Monitoring and Contingency Plan <br />dots\Compliance Monitoring PIan1CMCP 11-1 Q-OO.doc <br />FINAL - March 2001 Page 4-8 <br />