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1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />The City of Everett <br />The Floyd & Snider Team Everett Landfill/Tire Fire Site <br />methane exceeds 5% and any canister sample results do not give evidence of another source <br />other then the landfill, then subsurface landfill gas migration will be confirmed and the <br />contingency plans of Section 3.3.6 will be implemented. <br />Canister sampling may be conducted to determine whether the flammable gas originates from <br />migrating LFG or from some other source in the area such as the organic peat deposits. This <br />would be done by sampling and analyzing the gas from the affected sampling probe and <br />comparing the results with an analysis of landfill gas from the interior of the landfill. Fingerprint <br />gasses could include freon 11, 12 and 113, vinyl chloride, chloroethane, chlorobenzene, 1,4 <br />dichlorobenzene, and 1,1 dichloroethene. Isotopic identification, including tritium and carbon-14 <br />could also be used. <br />If the presence of migrating LFG in excess of the regulatory limit is confirmed as described <br />above, then temporary, localized controls would be evaluated, selected, and installed to control <br />migration in the vicinity of the affected perimeter compliance monitoring location. Perimeter <br />LFG migration control would be implemented in accordance with the Ecology approved Design <br />Report. Additionally, weekly monitoring would begin or be reinstated for representative off -site <br />buildings within 500 feet of the sampling site, if any. This would occur until the affected <br />monitoring probes no longer have methane present at greater than 5%. <br />3.4 LANDFILL GAS MONITORING FOR EXISTING STRUCTURES <br />3.4.1 ANIMAL SHELTER <br />3.4.1.1 Sampling and Inspection Plan <br />Floor drains with previously detected levels of flammable gas have been plugged and a floor <br />joint has been sealed. Flammable gas monitoring will be conducted weekly for one month after <br />any repair action, which includes plugging the drains and sealing the floor joint. Thereafter, <br />sampling will continue on a monthly basis unless flammable gas levels continue to be detected. <br />If measurements are below the action level for six months, sampling will continue on a quarterly <br />basis. Measurements will be taken at the following locations within the Animal Shelter: <br />• Restroom drains (sealed) — men's and women's restrooms <br />• Storage Room floor joint (sealed) <br />• Other representative floor drains as identified in a survey of the building <br />• Around all other utility penetrations of the floor <br />• Around electrical panels where conduit enters from outside the building <br />• Any other significant crack in the floor or non -grouted the joints. <br />A trained, qualified technician will conduct periodic sampling and inspection. The technician will <br />use an appropriate methane detection field instrument capable of accurately measuring <br />concentrations down to less than five ppm. Measurements are to be taken consistent with <br />procedures described in 40 CFR 60 Subpart WWW (Standards of Performance for Municipal <br />Monitoring <br />POEµBR Everett Landfill\PDF maker -final docs\Compliance Compliance Monitoring and Contingency Plan <br />Monitoring PIan\CMCP 11-10-OO.doc <br />FINAL - March 2001 Page 3-3 <br />