Laserfiche WebLink
~ ROBINSON ~ <br />BRICK ~ <br />COMPANY ~ <br />~E~~ <br />~ ~ <br />iii iiiiiiiiiiiiiiii <br />999 <br />~~~~~~~~ <br />tdAR 1 B 190 <br />March 14, 1990 <br />Mr. Gregg Squire <br />Mined Land Reclamation Division <br />215 Centennial Bldg. <br />1313 Sherman <br />Denver, Colorado 80203 <br />^INED LAlvf <br />RE: Amendment to Permit M-78-1t; Robinson Brick Company; Buffalo <br />Mine; 2nd Adequacy Reply. <br />Dear Mr. Squire: <br />This letter is intended to satisfy the concerns expressed in your <br />letter of 3/73/90. <br />t. The proposed wheat x wheatgrass cover crop seed will be <br />reduced to 5 pounds/acre. At X1.60/pound, the cost for the wheat <br />x wheatgrass would be $8.00/acre. <br />2. The maximum volume of material which will have to be cut from <br />the highwall during the final reclamation in any phase is based <br />on the following assumptions: <br />a. The maximum height of the highwall will be 40 feet, <br />b. The highwall slope will be between 1h:ty and 2h:1v, <br />averaging 1.5h:iv, <br />c. The maximum length of highwall will be 600 feet (1/2 <br />that length will be in ramps with a highwall height varying <br />from 0' to 40', and the other half with a height of 40'), <br />d. Approximately 500 yds3 of topsoil will be removed from <br />above the area to be cut and used for topsoiling previously <br />backfilled areas (size of area is 60 feet in width above <br />main highwall and tapering to 0 at the ends of the highwall. <br />Based on these assumptions, the total volume of material from the <br />highwall will be 20,000 bank yds3 of overburden and 500 yds3 of <br />topsoil. A maximum additional volume of 10,000 yds3 of <br />overburden stockpiled from the original cuts will also be used as <br />backfill; bringing the total amount of overburden to be spread to <br />30,000 yds3. <br />3. Another Exhibit L - Reclamation Costs - is being submitted <br />with this letter and reflects the cost of the seed noted in item <br />1 and the change in volume of backfill material from item 2. <br />1845 West Dartmouth • P.O. Box 5243 • Denver, Colorado 80217-5243 • (303) 781-9002 <br />