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~: ~y~~ ~ ~~ rrvrvr,a,s ` / '.+,^,) 9451004 ~ ~ ~/' FAX (303) 9455948 1001 Grand Avenue, Suilr 2E Glenwood Springs. CO 8ra01 October 71, 7893 Mr. Rick Mills Cyprus Yampa Valley Coal Company 29587 Routt Co. Road iF27 Oak Creek, Co. 804&7 RE: Wastewater Treatment Plant Impoundment Certification Dear Rick; The purpose of this letter is to certify that the Wastewater Treatment Plant ponds have been constructed in accordance with SGFA's design drawings dated September 1992. On AAay 26th 1 inspected the ponds. At the time of my vi3it, the first aerated pond was about 2J3 full of water, The dawnstroam embankment at that time snowed nn signs of seeps, wetness or dampness, Further, pond k2 had approximately 6^ to 12" of water from a previous water test. Again, the :finer for this pond appeared to be holding water because according to Ron golden, the water had Seen In the pond for several days. All pond dimsneions appear to be conaistcnt with the original design drawings. f have reviewed the soils testing performed during construction to verify that the embankmentawere compacted to the specified densities. Upon review of the density repcrts, all of the embankments exceeded the required 95% of maximum density specified. In several cases the preliminary test was below the required 95% but further retesting was accomplished In this area and exceeded 95%. Az you are aware, a soils engineer worked with us to design the ponds. The ponds (impoundments) were designed to retain water, zr.d based upon my observations on the z6th, the ponds were built in accordance with our plans and specifications. If we can provide you any additior,21 information, please contact me. 51 n Cerel y, SCHMUESER GORDON MEYER, INC. /~+--~--~-r~- Lows Meyer, P.E. cc: Ron Golden Marcus Middleton --_^ LOMi ja91085.1