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~a <br />Mr. Peter H. Evans <br />iii iiiiiiuiiiii iii <br />999 <br />GEC MINERALS, INC. <br />FLORENCE, COLORADO 81226 303/784-6891 <br />P.O. BOX 225 <br />February 16, 1981 <br />RECEIVED <br />Reclamation Specialist FEE3171~~1 <br />Mined Land Reclamation Division <br />423 Centennial Building MINED LAND RECLAMATION-COAL' <br />1313 Sherman Street <br />Denver, Colorado 80203 coo, oEPr, OE p1,4TURAL ItE50URCE5 <br />RE: The Amendment to "Detailed Blasting Plan" for the area within <br />550 feet from Dorchester's Fuel Storage Facilities - File #77-48 <br />Dear Peter: <br />As you requested on February 10, 1981, regarding several deficiencies <br />concerning GEC Mineral's "Detailed Blasting Plan" for the area within <br />550 feet from Dorchester's fuel storage, GEC Minerals, Inc. is now <br />having our consultant VME Nitro-Consult Inc. correct all these de- <br />ficiencies to conform with Rule 4.08, and submit to you for your <br />approval. <br />According to the suggestion provided by GEC's Blasting Consultant <br />VME Nitro-Consult, Inc., GEC Minerals, Inc. intends to use the "velocity <br />curve" and "charge/delay vs. distance" figures to design the blasting <br />plan. The proposed maximum weight of explosives to be detonated within <br />the average 8 millisecond period is as follows: - <br />Distance (ft) from Pc'.~ <br />the shot to Dorchester's GEC Proposed to ~+^~~ ~,k <br />Fuel Facilities Maximum ANFO (lb) use (lb/delay) <br />200 26 24 Z•~~' <br />300 60 54 Z•~~' <br />400 100 90 ~•~ <br />500 160 150 2 , IT <br />Per the recommendation by VME Nitro-Consult, Inc., GEC has arranged <br />one set of siesmographic instruments to continue monitoring the blasting <br />from round to round. Should any unreasonable blasting take place, GEC <br />will immediately inform the State to secure the blasting technique and <br />safety precautions required to be allowed to proceed with the proposed <br />blasting plans. <br />~Ver truly ou s, <br />L.K. C e <br />V.P. Operations <br />LKC:dQS yr y-~ ~bs.E{(~D~ <br />cc: eorchester ~ ~'~~11~ <br />tn~.~ <br />