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`\~-3601 <br />~Tlfllfl CITY TfSTIflG flflD fflGl~lfffllflG LflBOflflTOfl~, lcc. <br />CHEMICAL & PHYSICAL TESTS • INSPECTIONS • RESEARCH <br />HOME OFFICE: <br />882 CAOMWELL AVENUE <br />ST. PAUL. MINN. 66116 <br />BRANCH OFFICES: <br />BISMARC%, N.D. <br />FARGO. N. D. <br />GAANO FORKS. N.D. <br />MIN OT. N.D. <br />LA CAOSSE, WIS. <br />ROCHESTER. MINN. <br />SIO U% FALLS, S.D. <br />wATEALOO,IOwA <br />r a.,.~~ P <br />December 14, 1972 <br />CHARLES W. BRIT2IU S. P, E. <br />President <br />JOHN f. GISLASO N, P.E. <br />Executive Vlc e-President <br />NORMAN E. HEN NIN G. P.E. <br />Vice-President Engineering <br />ALBERT C. HOLLER. F. A.I. C. <br />Vice-President Chemistry <br />C LINTON R. EUE <br />SecreterV -Tre esurer <br />Ryan Landscape Company <br />3151 Country Drive <br />St. Paul, Minnesota 55117 <br />Gentlemen: <br />Re: Proposed Fly Ash Landfill <br />3151 Country Drive <br />This is in response to your request as to the feasibility of utilizing fly ash as <br />an engineered landfill on the above site. You indicated it would be utilized over <br />swamo deposits and to a thickness of about 3 ft. <br />During the past five years we have done considerable laboratory and field investigation <br />for the utilization of fly ash as engineered fill under both parking areas and buildings. <br />Since the fly ash is subject to extremely high temperatures it is rather inert. The <br />chemical analysis of the fly ash typically is as follows: <br />Silicon dioxide 44.5% <br />Metallic oxide 33.5 <br />Magnesium oxide 1,7 <br />Sulfur trioxide 2.0 <br />Loss and ignition 1.5 <br />The major portion of the metallic oxides are aluminum oxide and ferric oxide. Under <br />normal compactive effort the fly ash compacts to a density of 72 to 75 lb per cu ft. <br />Once the fly ash has been compacted in place chemical silicification occurs giving <br />a penetration resistance or standard N Value of around 15 blows per ft. When adequately <br />compacted the fly ash has a high internal friction and good compression index. On the <br />basis of our laboratory and field tests we concluded that fly ash is a good fill mater- <br />ial suitable for use in this area. Chemically the particles are extremely inert and <br />would not cause any contamination of the surrounding ground water. <br />Very truly yours, <br />TWIN CITY TESTING AND <br />ENGINEERING LABORATORY, .INC. <br />Norman E. Henning, P.E. <br />Pa 2 1$ Vice-President, Engineeri g <br />w! A NEH/jmgDTEDTIDN ~ [LY[l.ALL RCFORT! AFC lUB MITTCO AR THE CONFIDENTIAL FROFCRTY OF CLIENT!. AND AUTHOR- <br />IZATION iOq PUBLICATION ,.. _...._ EXTRACT! FROM Oq RLOAROIND pYR RCPORT! 1! q[![RVCD PCNOINO OUP WRITTCN ARPROVAL <br />