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1 <br />The City of Everett <br />The Floyd & Snider Team Everett Landfill/Tire Fire Site <br />3.0 Gas Pathway <br />3.1 OBJECTIVES <br />Compliance monitoring for landfill gas (LFG) has three objectives. They are: <br />• Demonstrate that landfill methane gas is not migrating beyond the perimeter <br />compliance boundary at a concentration exceeding 5% by volume (50,000 ppmv). <br />• Provide monitoring to protect public health and safety at the existing City Animal <br />Shelter, Snohomish County's Everett Transfer Station, and off -site buildings. <br />• Provide monitoring to protect public health and safety in future developed areas at <br />the Everett Landfill. <br />Monitoring plans for each of these objectives are presented below. <br />3.2 MONITORING TECHNICIAN QUALIFICATIONS <br />All monitoring will completed by trained and qualified technicians using instruments capable of <br />detecting flammable gas at a concentration at least one-half that of the performance standard <br />being applied. The technician will calibrate hand-held instruments in accordance with the <br />manufacturer's recommendations immediately prior to each use and record the results of the <br />calibration in the field log. Fixed, continuous reading monitors will be calibrated at least <br />quarterly in accordance with the manufacturer's recommendations. <br />3.3 PERIMETER SUBSURFACE LANDFILL GAS MONITORING <br />3.3.1. SAMPLING AND INSPECTION PLAN <br />The drilling logs indicate that six of the existing twelve sampling locations along the perimeter of <br />the landfill are installed in refuse. All existing sampling bcations are immediately adjacent to <br />the edge of the landfill and refuse. Perimeter compliance sampling locations must be outside <br />the perimeter landfill gas controls and buried refuse to demonstrate whether or not gas <br />migration is occurring. <br />New perimeter compliance sampling locations will be installed outside the proposed location of <br />the perimeter LFG controls and buried refuse. These will be installed on 200-foot centers along <br />the western side. North side locations will be on 100-foot centers, located within the roadway's <br />right-of-way. <br />The existing perimeter sampling locations along the eastern side of the landfill, LG-13 through <br />LG-16, will continue to be used, but only for informational data, and not for site compliance. The <br />compliance monitoring will be done with new compliance sampling locations east of LG-13 <br />through LG-16. <br />Monitoring <br />C an\CM Everett l.andfill\PDF maker -final docs\Compliance Compliance Monitoring and Contingency Plan <br />Monitoring Plan\CMCP 11-10-DO.doc <br />FINAL - March 2001 Page 3-1 <br />