Laserfiche WebLink
SENT BY:N1EL50N5, INC. : 3- 5-96 ~71:20AM <br />N/ELSONS <br />CON$iRUCTCRS •?PIQINEEpS'MPNAGEAS WC <br />DENVER <br />OS March 1996 d~F-ICE <br />NIEL50N5 ~TEZ-' III III'II!II"II'I) <br />Received <br />MAR 0 5 1996 <br /> <br /> <br />p <br />Colorado Dept, Natural Resources <br />Division of Minerals & Geology <br />215 Centennial Building <br />1313 Sherman Street <br />Denver, CO 80203 <br />Attention: Wallace H. Erickson, E.P.S. <br />Subject: M 76-059 <br />Cortez Sandstone Quarry <br />Dear Mr. Erickson: <br />Durango Reid Office <br />D'wlslon or rt~,arr_!s & Goolcgy <br />Salvaged topsoil stockpiled at the north end of the quarry site shall be evenly spread over <br />disturbed aeeas of the north edge and east edge of the excavation just outside of the remnant <br />headwalls. Such topsoiling should assist with re-vegetation of the disturbed areas and also serve <br />to prevent surface water runoff spill-over into the pit area, by slightly elevating the surface. <br />Per your earlier telephone inquiry please be advised the sandstone blasting is accomplished using <br />3 1/2 or 4 1/2-inch diameter drilled holes (depending upon the contract driller used) in fifteen- <br />foot depths, filled with ammonium nitrate (Anfo or Prill) powder and an ammonitun-based <br />dynamite and electric cap igniter. Powder required is usually about one pound per cubic yard of <br />rock blasted. <br />Yours very truly, <br />NIELSONS, INC. <br />~~ <br />ou las L. Con er L l/ <br />D g g <br />Engineering -Geologist <br />DLC:Is <br />cc: file -Cortez Pit <br />~e"~ <br />~~ i~ `p ~ <br />~M ,~,5 <br />P.O. Box 1660 22419 County Rd. G Corte:, CO 87321 Phone: 97D-666.600D Fax: 970-565.0198 An Equal OpDOrtuniry Employer <br />