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LUaste rganagemen~ of rninnesnta~ Inc. /~ <br /> 14730 SUNFISH LAKE BLVD. ° ANOKA, MINNESOTA 55303 * PHONE 612/421-0540 ' <br /> <br />Director, Environmental Services <br />County of Anoka <br />Community Health and Social Services Department <br />Fourth Floor <br />Courthouse <br />Anoka, Minnesota 55303 <br /> <br />Dear Mr. Hutchison, <br /> <br /> Waste Management of Minnesota would like to take this op- <br />portunity to respond to your letter dated August 19, 1980 which <br />addresses the control of combustible gas migration at the Anoka <br />Landfill. Since our mutual meeting with the local residents on <br />August 15, 19~0~ Waste Management has taken several remedial <br />actions and continue to update and upgrade the migration control <br />system. <br /> Specifically~ on August 15, 1980, after our meeting at <br />the City of Ramsey City Hall, we switched the motor-blower unit <br />into full-time continuous operation. Additionally, due to our <br />uncertainty at that time of the efficiency loss to the system <br />when the muffler was in'place, we removed said muffler until <br />appropriate system engineering analysis could be performed. The <br />system currently continues to operate on a 24 hour basis. <br /> On August 20, 1980~ Mr. John Pacey and Mr. Charles Brisley <br />of Emcon Associates~ San~ Jose, California, the firm that designed <br />the migration control system, came to the site to perform a pre- <br />liminary analysis and provide consultation on gas monitoring <br />probe construction and installation. <br /> With respect to system analysis~ Emcon opened five header <br />system monitoring port holes to evaluate, through the use of a <br />Pitot tube/differential air pressure monitor (Magnehelic gage) <br />the-flow rate and volumes within the header system and average <br />volumes each extraction well is providing. As a result of this <br />work, Waste ~,~anagement has purchased the appropriate equipment <br />to provide comprehensive monitoring to establish a long term <br />record of system performance. Additionally, Waste Management <br />has undertaken on August 28, 1980 a second system check to e- <br />valuate the replacement of the temporary muffler constructed-by <br />site personnel. The net results indicate that the muffler <br />should not impair the system~ ability to prevent migration of <br />gases beyond the west property boundary and therefore, as of <br />August 28, 19~0 will remain in place unless future monitoring <br />indicates the need to increase system flow volumes. The de- <br />tailed results of the system analysis as performed by Emcon <br /> <br /> <br />