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,645 -3601 <br />T1..Ifl CITY <br />IfST1f1G flfD fflGlflfflflflG LRBORRTOflY, Inc. <br />CHEMICAL & PHYSICAL TESTS • INSPECT ONS • RESEARCH <br />HOME OFFICE: <br />662 CROMWELL AVENUE <br />ST. PAUL, MINN. 55114 <br />BRANCH OFFICES: <br />BISMARCK. N.D. <br />FARGO. N.D. <br />GRAND FORKS. N.D. <br />MINOT. N.D. <br />LA CROSSE, WIS. <br />ROCHESTER. MINN. <br />SIOUX FALLS. S.D. <br />WATERLOO. IOWA <br />Ryan Landscape Company <br />3151 Country Drive <br />St. Paul, Minnesota 55117 <br />Gentlemen: <br />Oecanber 14, 1972 <br />CHARLES W. BRITZIUS. P.E. <br />President <br />JOHN F. GISLASON. P.E. <br />Executive Vice- President <br />NORMAN E. HENNING. P.E. <br />Vice - President Engineering <br />ALBERT C. HOLLER. F.A.I.C. <br />Vice - President Chemistry <br />CLINTON R. EUE <br />Seereterv-Tteesurer <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 />swamp 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 <br />Metallic oxide <br />Magnesium oxide <br />Sulfur trioxide <br />Loss and ignition <br />44.5% <br />33.5 <br />1.7 <br />2.0 <br />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 ANO <br />ENGINEERING LABORATORY,. INC. <br />Norman E. Henning, P.E. <br />Vice - President, Engineeri a <br />NEH /jm Page 18 <br />AS A MUTUAs. PROTECTION ELVES. dLL REPORTS ARt SUSMITTEO As THE CONPIOENTAL PROP! RP/ OP CL[N•f. ANO AUTHOR. <br />RATION FOS •URLIGTtON _. EXTRACTS PROM OR REOAROIHO OUR REPORTS IS REIERVEO KNOINO OUR MRITTEN APPROVAL <br />