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• I.a~ndmarla iii iiiiiiiiiiiuiii ENGINEERING Ltd. January 25, 1993 Project No. KAUSO-92012I-OS-330A1 Mr. Terry McKee USA Corps of Engineers 9307 State Highway 121 Littleton, CO 80123-6901 RE: KAUFFMAN GRAVEL PTT Dear Terry: In response to your request for additional information about the health aspects of using "spent" limestone to replace the exaacted gravel volume, we have contacted the Larimer County Health Departrnent. This is an on-going question, which they have been addressing for yeazs. They aze preparing a letter for you, outlining the general situation of reuse, from the public health perspective. Additionally, we have contacted the chemists of Western Sugar Company. They inform us that when the material left the plant, it normally would have contained calcium carbonate (CaCO3) with a trace of magnesium carbonate and about 12 to 15% beet "impurities", which include sodium and potassium sale, fiber, dirt and some amino acids. They feel that the beet impurities would have long ago degraded and/or leached out of the dikes, and the remainder would be simply a very stable calcium carbonate. Since the beet impurities were in essence from the ground when the beets were grown, they see no way the material can be regarded as a health concern. Some studies have been done by the sugaz company evaluating the material for alternative uses. Mr. Maggi of their Denver office has supplied us with the attached analysis of the material as it is when it leaves the plant The figures shown are from the Fc Morgan plant, but he indicated they aze quite representative of all the plants in their system. The figures represent percentages by weight 3521 Wut Eisenhower Blvd. Dale D. Olhausen. P.E. & L.S. Loveland, Colorado 80537 President i:'~,~ ' , i ENGINEERS • ARCHITECTS • PLANNERS • SURVEYORS :~:d--' Loveland (303) GG7-6286 FAX (303) 667.6298 Dcnvct(303) 629-7124