GENERAL54071 - Laserfiche WebLink

Home Browse Search

i ~~~ ~I~~~~~I~~~~~~~~ STATE OF COLORADO DIVISION OF MINERALS AND GEOLOGY Depanment o(Nalural Resources 1313 Sherman 51., Room 215 Denver, Colomrio A0207 Phone: 13031 A66-}567 FAX (303) 832-A106 January 29, 1997 Mr. Michael G. Altavilla Seneca Coal Company P.O. Drawer D Hayden, CO 81639 RE: Yoast Mine (C-94-082) Haul Roads A & B Preliminary As-Built Certification Deaz Mr. Altavilla, II~ DEPARTMENT OF NATURAL RESOURCES Roy Romer Governor lames 5. Lochhead Executive Director Michael B. Long Division Director The Division of Minerals and Geology received the preliminary as-built certification for Haul Roads A and B for the Yoast Mine. The preliminary certification statements consisted of compaction testing data and appropriate Proctor determinations for the development of compazison standazds performed by Northwest Colorado Consultants, Inc. The assembled compaction testing results performed over a period of approximately twelve months, from August of 1995 through August of 1996, report 181 compaction tests with 13 associated proctor determinations for control standazds. Testing appeazs distributed randomly throughout the 16,100 foot length of Haul Road A and the 6,100 foot length of Haul Road B. Tests were performed at varying lift depths and at varied locations throughout the roadway structure. Whenever a substandazd test result was completed, the report presents the remedial measures taken and documents that the materials were recompacted and the inadequacy corrected. The methodology and reporting by Northwest Colorado Consultants, Inc. appeazs to have been performed in cazeful compliance with the ptvdent state of the soils testing discipline. Their methods and reporting aze precise and through. Based upon the assembled reports, the Division is confident that the compaction of earthen material was properly accomplished during the construction of both subject Haul Roads at the Yoast Mine. Seneca states that a final survey will be conducted in the Spring of 1997 which will generate the as-built drawings for both haul roads. It was agreed to by Seneca Coal Co. and the Division during the meeting of December 19, 1996 that the haul road cut and fill slopes and the drainage configuration would be surveyed as soon as possible to determine any vaziance from the original design.