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iii iiiiii-iiiiiiiii E7~ON COMPANY, U.S.A. POST OFFICE 80% 14342 • AURORA. COLORADO 80014 SYNTHETIC FUELS GE PA RT!::E hT OPE FAT OR. COLONY S%iAl_[ ~ I~ aROJECT April 29, 1983 Mined Land Reclamation Division Colorado Department of Natural Resources 1313 Sherman Street Room 425 Denver, Colorado 80203 Attention: Mr. James B. McArdle Senior Reclamation Specialist Dear Mr. McArdle: r,P~ u s ~qa3 IL11Nf=D LANG RECLA(VIAI iGPd Gc!o. Dept. o. P,atura! Rese~~rce4 Attached is a map showing the location of the incomplete segment of the Colony plant access roadway which exists in the vicinity of the boundary of Areas 9 and 19d. This is the area in question in the Mined Land Reclamation Board's permit stipulations as described in Mr. Jim Pendleton's letter to you of December 21, 1982. Mr. Pendleton suggests that, "this segment of road could result in water im- poundment and a subsequent erosive breakout". After further field investiga- tion, Exxon believes that no appreciable water impoundment will occur in this area. At the time of the MLR staff inspection shortly after the Colony shutdown, Exxon engineers were not aware that the rock which could possibly impound the water had been blasted and was, therefore, permeable. The recent runnoff from the snowmelt and spring rains has resulted in no water ponding in the questioned area. The water does course through the porous pile of blasted rock, and returns to the channel to the north and subsequently on to the Davis Gulch Cofferdam. As you know, this cofferdam is the upstream structure in Colony's sediment control system. Exxon plans to insure that this blasted rack continues to act as a "French Drain" during this Interim Site Plan period. Please contact me if there are further questions regarding the fulfillment of this permit stipulation. Sincer~ ~l~i~"" '___- Robert E. Niemela Regulatory Affairs Advisor REN:sm Attachment +_ .'SIOY O~ E1%J.\' CC aPOFtTI(]';