Agenda - Council - 10/14/1980 - Laserfiche WebLink

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Safety signs and procedures should be posted around and within the con- trol house facility. All piping to and from the blower should be carefully sealed to prevent leaks into the inlet side (reduces vacuum efficiency) and out of the discharge line (causes methane to enter the building). Monitori__n~g Off-Site Migration - During our site inspection, we were requested to check the gas presence in the adjacent five homes west of the landfill. A relatively thorough check revealed no significant presence of gas. In all homes we checked readily available floor and wall openings and selected ceiling area air spaces. In only a few instances did we find a level of concentration.above zero; the maximum level was 0.2 percent combustibles in air. During our inspect:ion of the homes, we met 'with Ms. Ingrid Richie of the State Health Department and Hr. Arthur Dunn 6f the County of Anoka Community Health and Social Services Department, who were also monitoring gas concentra- tions. Their maximum reading of 0.25 percent was sufficiently close to our .readings to lead to a verbal agreement of findings. Ne also measured gas con- centrations in several probe holes which reportedly measured in excess of 5 percent combustibles the previous day, but which we found to be zero. We concluded from our house and yard survey that as of the time of our survey, there was no hazard condition in the homes. Gas Probes- Gas probes should be installed midway between extraction wells along the west and north property lines. In addition, at three of th~se probe locations, an additional probe should be installed midway between the refuse and the property line probe. The probes should be installed in accor- dance with the attached design (see Figures I and 2). A surface cap design should be developed to prevent vandalism. The gas monitoring interval is recommended at seven to ten feet below ground surface, an adequate depth to be below the frost penetration depth. There is no need to install gas probes outside your property, since the concentration of gas in these perimeter .probes will be the basis for deter- mining the performance and adequacy of the control system and allow for the adjustment of well flows to achieve an efficient and balanced system. Some adjustment of flow may be necessary from time-to time due to the many varia- bles, such as permeability of soil, weather impacts on surface and subsurface conditions, and the rate of .gas generation in the refuse': The gas probes