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AMERICAN <br />~ • MATERIALS <br />INC. <br />L~'il <br />June 12, 1982 <br />Mr. Mike Savage <br />Mined Land Reclamation <br />423 Centennial Building <br />1313 Sherman Street <br />Denver, Colorado 80203 <br />RE: Trinidad Basin Mining <br />File [~o. C-048-81 <br />Dear Mr. Savage: <br />This is in response to Mr. Jim Pendleton's letter to you of <br />April 1, 1981. The corrections and additional information requested <br />~• is provided as follows: <br />(1) Table V-1 has been revised to show the cumulative L.C.Y. as <br />the difference in the Total B.C.Y. removed from each cut and the <br />O.B. Pit L.C.Y. placed back with any (+) quantity representing <br />the amount temporarily stored until the last cut is backfilled. <br />In each pit the O.B. B.C.Y. is moved from the first cut to the <br />designated overburden storage area with the second cut O.B. B.C.Y. <br />being stored in the preceeding open and mined out pit, continuing <br />to the last cut which is backfilled with material from the O.B. <br />storage area. <br />(2) Field observation of mined out and backfilled areas show that <br />the spoil generated has sufficient swell to return the mined area <br />to the original contour with a negligible amount of excess material <br />left over. The scaell factor or 167 was arrived at by dividing <br />Total B.C.Y, by O.B. B.C.Y. on previously mined areas. As the <br />standard engineering procedure for any type of earthwork design <br />is to use an approximate swell figure based on prior construction <br />experience with similar type overburden we feel the use of the 167 <br />figure is justified from the best information available. <br />(3) The original table was in error in designating O.B. ~9 as a <br />permanent storage area as the material temporarily stored will be <br />needed to backfill the adjacent cuts when mining is completed. <br />L <br />P. O BOX 198 GLF.5G0 W, KENTUCKY 42141 502651-2178 <br />~ v- y D L a~ <br />