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~ ..J 1 n Geocechnkal l Enrironmencal Engineering • Materlalf Terting October 9, 1998 Bower Bros. Construction 595 Taylor Street Craig, CO 81625 Attn: Mr. Bud Bower ]ob No. 95-2296 Subject: Quarterly inspection Report, Waste Coal Area, Foidel Creek Mine, Routt County, Colorado. Ladies & Gentlemen, III III'IIIIII'II'II RECEIVED NOV 13 1SS8 ~~i~~i~,on of Minerals 8 hrato^~~ As requested, Northwest Colorado Consultants, tnc. has prepazed this letter outlining our inspections made during the third quarter of 1998 at the Waste Coal Area, which is located at the Foidel Creek Mine in Routt County, Colorado. We visited the project site on July 24 and August 18, 1998 to inspect the waste coal area. At the time of our visit on July 24, 1998, [be contractor was placing a lift of the waste coal materials in the north central portion of the waste coal azea. The contractor advised us that they had not completed a 2 foot thick lift over the area as of this date and that they would schedule us for testing after the lift had been completed. As requested we visited the project site on August l8, 1998 to test the wmpaction of the waste coal materials. The contractor had placed a majority of the fill materials in the north central portion of Area Nl. Two compaction and moisture content tests were taken on the compacted fill materials during this site visit. The approximate location of the tests are shown in the attached Figure al . Copies of our compaction test results and daily reports are also attached. It should be noted that the abbreviations given in the Nucleaz Density Test Results (Proctor Data) are as follows: Maximum DD = Maximum Dry Density and OMC =Optimum Moisture Content. Both of these va]ues have been determined in accordance with ASTM D698/AASHTO T99. Based on our pan-time observations and inspections, it appears that the waste coal materials were being placed and compacted in general accordance with the project plans and specifications. As noted in [he previous inspection report, the water levels in the monitor wells, installed on October 23, 1997, were measured during this quarter. At the time the measurements were taken on September 25, the water level in the south well (test hole I) was 28.3 feet below the top of the casing which correlates to an elevation of 6,896.2'. It should be noted that the top of the casing for the north well (test hole 2) was buried. On October 1, 1998, the top of the casing for the north well (test hole 2) was uncovered. The water level in this well was 18.6 feet below the top of the casing which correlates to an elevation of 6,894.7'. The water level in the south well (test hole 1) was still 28.3 feet below the top of the casing. (970) 879.7888 • Fax (970) 879.7891 2063 Snow Bowl Plaza, P.O. Box 775226 • Steamboat Springs, CO 80477