Agenda - Council - 05/05/1980 - Special

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' ERALD M. S DE, Consulting Engin~r 10524 ZION AVENUE SOUTH ' MINNEAPOLIS, MN 55437 · PHONE (612) 881,-3344 .December 14, 1978 Mr. Craig Johnson Waste Management of Minnesota, Inc. 14730 Sunfish Lake Road Anoka, Minnesota 55303 Dear Mr. Johnson: Re: Remaining Life and Fill Rates at the Anoka Sanitary Landfill, Anoka, Minnesota You requested that we review refuse quantities received at the above landfill for the period since the fall of 1976. Also, we were instructed to estimate the inplace volume of materials placed during a similar period. To estimate use of air space volume for the study period, we performed a survey of the fill areas that have been constructed (luring the last two years. The landfill contours as of December 1, 1978 are shown on the attached figure. These contours were compared to the Stage 1 (existing conditions) contours shown on the revised landfill plans dated April 28, 1977. As those plans show, the Stage 1 contours were representative of conditions as of March 1, 1977. We caculated approximately 565,300 cubic yards of landfill air space were used during the period from March 1, 1977, to December 1, 1978. In our letter of September 17, 1977, we indicated that approx- imately 3,419,000 cubic yards of air space volume remained at the Anoka Landfill site as of September 1, 1976. Subsequent projections of remaining life of the site and refuse quantities were based on ~hat remaining volume and an annual growth rate of 7~ percent. The attached table shows gate receipts for the landfill for the period from January 1976 through November 1977. It can be seen that volumes decreased during 1977 but have increased noticably during 1978. 2'he following table summarizes our calculations of remaining air space volume, ratio of gate volume to air space volume, and land- fill remaining life. at a growth rata of 7~ percent. It should be understood that air space volume refers to the total space filled and includes both refuse and cover soils.