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>_ <br />ARCO Coel Compa <br />Permits and~rpliance Group <br />555 Seventeenth Street <br />Mailing Address: Box 5300 <br />Denver, Colorado 80217 <br />Telephone 303 575 7500 <br />December 23, 1981 <br />Mr. Tom Gillis <br />Mined Land Reclamation Division <br />Colorado Department of Natural Resources <br />1313 Sherman Street <br />Denver, Colorado 80203 <br />Dear Tom: <br />• ii-iiiiuiiniiiiii <br />;1.,.,.1331 <br />., I <br />. !'.;.'i <br />,. G'. I. ~ ... ? ~ , .r ~. <br />This letter references your September 25, 1981 letter and our recent telephone <br />conversation concerning the follow-up information to our September 11, 1981 <br />response to CMLRD Stipulation 2 issued as part of the CMLRD permit for Atlantic <br />Richfield's Mt. Gunnison No. 1 Mine. Stipulation 2 requires ARCO to submit a <br />Sedimentation Control Plan for the loadout facility and railroad siding. <br />We have revised page 3-46b of the Mining and Reclamation Plan for the Mt. <br />Gunnison No. 1 Mine to reference this letter with the attached drawing, which as <br />you requested, clarifies the design for the sedimentation pond at the loadout site. <br />Please note that the attached drawing is a partial copy of the Site Plan for the <br />loadout facility found on page 90C of Exhibit 3.1.1.D. I plan to have our <br />consultants revise page 90C in Exhibit 3.1.1.D. to reflect these changes. <br />The following discussion responds to the concerns raised in your September 25 <br />letter: <br />1. It appears from Drawing C-OOSC that water cannot enter the sediment <br />pond, since the elevation of the pond embankment is 6,081 feet and the <br />elevation of the surface of the loadout appears to be 6,080 feet. This <br />needs to be clarified. <br />Please refer to the attached drawing which identifies the elevations of <br />the loadout facility and the sedimentation pond. <br />2. There are no plans which show a primary dewatering device for the <br />pond. ARCO must state the method planned to be used to dewater the <br />pond. <br />Dewatering of the sedimentation pond will occur through a 6-inch <br />drainage pipe and valve as shown on the attached drawing. <br />anrn [wi ~,,,,,o,.,, m .. m.;....., „~ mmmo- u„ on~inc~~„r,,,y <br />