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_ ..-~-~~ ARCO Coal Company •~ • ~ • ' Permits and Compllanee Group • 555 Seventeenth Street Mailing Address: Bo: 5300 Denver, Colorado 80217 Telephone 303 575 7500 December 23, 1981 Mr. Tom Gillis Mined Land Reclamation Division Colorado Department of Natural Resources 1313 Sherman Street Denver, Colorado 80203 Dear Tom: LETTER 3.3.1.A - _.~ 9 ~ ~r This letter references your September 23, 1981 letter and our recent telephone conversation concerning the follow-up information to our September 11, 1981 response to CMLRD Stipulation 2 issued as part of the CMLRD permit for Atlantic Richfield's Mt. Gunnison No. 1 Mine. Stipulation 2 requires ARCO to submit a Sedimentation Control Plan for the loadout facility and railroad siding. We have revised page 3-46b of the Mining and Reclamation Plan for the Mt. Gunnison No. 1 Mine to reference this letter with the attached drawing, which as you requested, clarifies the design for the sedimentation pond at the loadout site. Please note that the attached drawing is a partial copy of the Site Plan for the loadout facility found on page 90C of Exhibit 3.I.1.D. I plan to have our consultants revise page 90C in Exhibit 3.1.1.D. to reflect these changes. The following discussion responds to the concerns raised in your September 23 letter: 1. It appears from Drawing C-OOSC that water cannot enter the sediment pond, since the elevation of the pond embankment is 6,081 feet and the elevation of the surface of the loadout appears to be 6,080 feet. This needs to be clarified. Please refer to the attached drawing which identifies the elevations of the loadout facility and the sedimentation pond. 2. There are no plans which show a primary dewatering device for the pond. ARCO must state the method planned to be used to dewater the pond. • Dewatering of the sedimentation pond will occur through a 6-inch drainage pipe and valve as shown on the attached drawing.