GENERAL39630 - Laserfiche WebLink

Home Browse Search

-3- to retain the most valuable information on water quality conditions at specific locations and critical time or flow conditions. A revised NPDES permit was also approved by the Department of Health during the first half of the permit period. This allowed separate discharge points for mine pumpage and sediment pond discharges where these two were formerly combined as a single discharge from the pond. NPDES reports have been regularly submitted during the period. A revised subsidence monitoring program was put into effect during the first half of the permit period. Four quarterly surveys recently completed were reported with a fifth survey to follow in order to define baseline conditions. A reduction to an annual survey following this last measurement is suggested (see Revisions Required" Section). This continued monitoring, along with the operator's commitment to completion of a photographic record of all potentially affected structures, should ensure compliance with subsidence monitoring requirements during the permit period. II. DECISION TO REQUIRE RE4ISION Based on this review at the mid-term of the permit period, the Division finds that certain revisions and modifications are needed to ensure future compliance with the Colorado Surface Coal Mining Reclamation Act and Regulations of the Colorado Mined Land Reclamation Board for Coal Mining. The section which follows details the revisions required, justification for requiring the revisions and timetable for submitting the revisions. The response from Grand Mesa Coal Company should follow the procedures defined for a technical revision to the permit and should be submitted within 60 days of receipt of this mid-terns report. Revisions Required at Mid-term Based on the review of the Red Canyon Mine Permit presented above, the Division finds that the following revisions are required at the mid-term of the permit period: 1. The recent change of address and phone number of the local office and general office needs to be updated on the permit application (page 1) and submitted as a revised page for insertion in the permit document. The permittee should also change this information on mine identification signs as needed within 30 days. 2. The modification of the existing federal coal lease D-055156 as described in the Colorado State Office of the Bureau of Land Management environmental assessment No. CO-030-U84-38 (November 9, 1984) needs to be included in the description in the permit. Appropriate page revisions should be submitted.