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r $tATE OF COLORADO 4IC Hnan D, ~. f,nvirn n~ ~~ DEPARTMENT OF NATURAL RESOURCES Harris D. Sherman. Executive Director ML~iED LAND RECLAMATION 423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (303) 639-3567 David C. Shelton Director October 6, 1980 Mr. Gordon Bruckner, P.E. ARIX, Inc. 760 Horizon Drive Grand Junction, Colorado 81501 Dear Gordon: I forward this note Ko document and clarity our telephone conversation of Friday, October 3, 1980, regarding the certification of stability of the Roadside refuse Wile ac GEX Colorado, Inc. in Cameo, submitted by your firm. have reviewed the stahility analyses completed under ARIX's direction over the past two years. ?Ty one lingering concern regards the seepage evidenced on the face of the refuse pile at approximately 35 feet above the toe. The saturated condition of the lower portion of the pile 'is generally indicated by an evaporative salt or alkali residue as well as by a low flowing seep. I note that the second cross section of the "ten most critical of surfaces generated" (contained in appendix B of your June, 1980 report) does show an elevated phreatic surface. However, no discussion of the specifics of that phreatic surface is contained within the reports text. Because of the potential critical effects of phreatic surface elevation changes, I believe that this topic deserves specific treatment in the certification of refuse piles stability. For that reason I request that your firm prepare a letter of supplement to the certification report which specifically discusses: (1) The phreatic surface assumed within the orginial stability analysis; (2) The existing condition as relates to the seepage occui•ing; (3) 1'he projected future equilibrium phreatic surface following final reclamation of the refuse pile; and (4) Proposed surface preparation for drain design elements which would assure a stable final surface of the refuse pile following application of the required nontoxic cover material.