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<br />E7~ON COMPANY, U.S.A. <br />POST OFFICE eOX 308• GRAND JUNCTION. COLORADO 81502-0308 <br />COLONY SHALE OIL PROJECT <br />Mr. James B. McArdle <br />Senior Reclamation Specialist <br />Mined Land Reclamation Division <br />Colorado Department of Natural Resources <br />1313 Sherman Street, Room 423 <br />Denver, Colorado 80203 <br />Dear Mr. McArdle: <br />• ~lll IIIlllllllllllll <br />August 30, 1985 <br />Re: Development and Extraction <br />Permit No. 80-47 <br />I:.. <br />-~ <br />SE? `=~ 19c~i <br />IYiifdCls I_;}(Vii <br />RECLAMATIC;f~ f?IVISIC)~f <br />In reference to our phone conversation on August 19, 1985, Exxon is <br />submitting this letter as a technical revision to Colony's Permit No. 80-47. <br />Colony has had a sediment control system comprised of five sediment ponds <br />since 1981. This technical revision is for the purpose of removing the two <br />smallest ponds--sediment ponds #3 and 4. <br />As you will recall, Exhibit G of Colony's Interim Site Plan Amendment <br />clearly demonstrated that Colony's lower three sediment ponds (Ponds #3, 4 <br />and 5) required a combined volume of 1.97 acre-feet to properly treat the <br />10-year, 24-hour storm. In addition, the annual sediment volume for the same <br />drainage area was shown to be 1.5 acre-feet. <br />These lower three ponds have been cleaned out several times since 1981. The <br />ponds' capacities have steadily increased with each cleaning. A recent field <br />survey of sediment pond #5 revealed that this single pond has a storage volume <br />of slightly greater than 3.5 acre-feet which exceeds the combined 10-year, <br />24-hour storm runoff and annual sediment volumes for the 1475-acre drainage <br />area serving sediment ponds #3, 4, and 5. <br />#31/13 <br />A DIVISION OF E%%ON CORPORATION <br />