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~--''= 5rnri or C~~i r~nn nr~ „~~ nnuii n i nrriu c;,.~•."~~,~ D EPARTMENI OF NATURAL. RESUURC ES ~~' ^r~~"~"~~"" -~ Hares D. $irerman. Eeecuiive Der uc loi 999 11IIN~:1) L,1ND RF.C;LA1~lA'I'IOV 723 Centennial Building, 1313 Sherman Stree[ Denver, Colorado 80203 Tel. 1303) 8393567 June 23, 1980 TO: Marion Dodson FROM: Jim Pendleton RE: Western Slope ill Embankment and Portal Stabilization Concerns t Following our visitation of the mine site Tuesday, June 17th, and a telephone conversation with Dan Rinehart, Western Slope's consulting engineer, I " forward the following comments for your consideration: ~~l) My concerns about the fill placed to expand the parking lot embankment area focus upon the implication should a failure occur, resulting in the ~,displacement.of the down slope septic lagoon. Effluent could contaminate the river. The fill is steep and evidencing minor cracking (which could be shrink/swell or evidence of a rotational movement). It will be extremely important for Western Slope Carbon to regrade the parking lot area in order to assure good drainage of that portion of the embankment top. If water is allowed to continue to pond in that area, a failure will be likely. I indicated to Dan Rinehart that I would be willing to accept a stipulation for submittal by him of the following materials: a) A detailed regrading plan to assure elimination of ponding on the fill area, and; b) An engineering certification by him of the stability of the fill based upon his examination of the embankment. I indicated that these materials would have to be submitted by the end of August, 1980., He indicated, in addition that the company desires to enlarge the septic lagoon. He asked if I had any suggestion reyardiftg its location. I declined to make a recommendation, but cautioned him of the Health Department ramifications of the septic I.~goon/creek cross scope relationship. 2) Dan also inquired about the portal area concerns, as referenced in your letter to Al Amundson, dated June 11, 1980. Mr.Rinehart indicated that the company intends to build a short (4 to 5 foot high) toe retaining wall which will allow reduction of the portal slope in order to accomodate vegetative stabilization. I responded that I found that approach acceptable, recommending Hamlet J. Barry, III, D irector y arbo ompany's Parking Lot F (cont'd)