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STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />1313 Sherman S[., Room 215 <br />Denver, Colorado 80203 <br />Phone: (303) 866-3567 <br />FAX: (303) 832-8106 <br />To: Jim Stark, Sandy Brgwn <br />From: Harry Ranney / ,tom'' 'III/ <br />Date: December 10, 2002 <br />Subj: Southfield Survey Results <br />DIVISION OF <br />MINERALS <br />GEOLOGY <br />RECLAMATION <br />MEMO FOR RECORD MINING•SAFETY <br />Rill Owens <br />Governor <br />Greg E. Walther <br />Executive Director <br />Ronald W. Canany <br />Acting Division Director <br />The following are results from the survey of the Southfield Mine properties that was performed on December 5, 2002. <br />1. Footprint of the refuse pile in acres: 37.26 acres <br />2. Footprint of the borrow area: 2.83 acres <br />3. Footprint of the Pond 3 disturbed area: 2.94 acres <br />4. Pond 3 topsoil pile area: 0.47 acres <br />5. Volume of topsoil remaining at NW corner of refuse pile: <500 cubic yards <br />6. Slopes of the newly constructed drainage ditch through Pond 3 going downstream from station 0+00: <br />Sta 0+00 [o I+00 + 0.07% <br />Sta 1+00 to 2+00 -1.16% <br />Sta 2+00 to 3+00 - 0.21 <br />Sta 3+00 to 4+00 - 0.81 <br />Sta 4+00 to 5+00 - 1.61 <br />Sta 5+00 to 6+00 - 1.72% <br />The 100 year diversion ditch around the waste pile had positive drainage throughout [he entire circumference <br />with the exception of a 50 foot section at the extreme N W comer of the refuse pile. This section has a slight <br />rise of < ]inch. After the first flow of any significance, this problem could clear itself. <br />8. A 100 foot section of Magpie Creek at a point of about 325 feet upstream the grouted riprap section, 1"rock <br />energy dissipater, rises approximately 3 inches. This problem should also self correct after the first storm of <br />any significance. <br />9. Four slope gradients of [he refuse pile were taken, two a[ [he NE comer and two at the SW comer. The results <br />were <br />NE Cm. 30.05% and 32.10% <br />S W Cnr. 10.27% and 24.59% <br />I have attached a small drawing of the survey for reference. <br />