Agenda - Council - 09/08/1980 - Laserfiche WebLink

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Baste management of minnesota, Inc. ,~., ~.r':].~ 14730 SUNFISH LAKE BLVD. ' ANOKA, MINNJ~SOTA 55303 " PHONE 612/421--0540 ' JJ Director, Environmental Services County of Anoka Community Health and Social Services Department Fourth Floor Courthouse .Anoka, Minnesota 55303 Dear Mr. Hutchison, Waste I4anagement of Minnesota would like to take this op- portunity to respond to your letter dated August 19, 1980 which addresses the control of combustible gas migration at the Anoka Landfill. Since our mutual meeting with the local residents on August 15, 1980, Waste Management has taken several remedial actions and continue to update and upgrade the migration control system. Specifically, on August 15, 1980, after our meeting at the City of Ramsey City Hall, we switched the motor-blower unit into full-time continuous operation. Additionally, due to our uncertainty at that time of the efficiency loss to the system when the muffler was in place, we removed said muffler until appropriate system engineering analysis could be performed. The system currently continues to operate on a 24 hour basis. On August 20, 1980, Mr. John Pacey and Nr. Charles Brisley of Emcon Associates, San'Jose, California, the firm that designed the migration control system, came to the site to perform a pre- liminary analysis and provide consultation on gas monitoring probe construction and installation. With respect to system analysis, Emcon opened five header system monitoring port holes to evaluate~ through the use of a Pitot tube/differential air pressure monitor (Nagnehelic gage) the flow rate and volumes within the header system and average volumes each extraction well is providing. As a result of this work, Waste Management has purchased the appropriate equipment to provide comprehensive monitoring to establish a long term record of system performance. Additionally, Waste Management has undertaken on August 28, 1980 a second system check to e- valuate the replacement of the temporary muffler constructed-by site personnel. The net results indicate that the muffler should not impair the system~ ability to prevent migration of gases beyond the west property boundary and therefore, as of August 28, 1980 will remain in place unless future monitoring indicates the need to increase system flow volumes. The de- tailed results of the system analysis as performed by Emcon