REV00181 - Laserfiche WebLink

Home Browse Search

iii iiiiiiiiiiiuiii Aggregate Industries Brighton Mine; Permit M-1977-436 Discussion Item before the MLRB November 9, 2001 DMG conducts a routine inspection of the Brighton Mine. The North pit is approximately 65 feet from the South Platte River and river water seeping into the pit has created instability in the pit slopes in terms of slumps and slides. Item was noted as a problem in the inspection report, "The mining pit slopes in the Nortlt Pond nppears to be unstnble due to the seeping of water from the South Platte River. Several slides and sGtmps were observed within the pit area. 34-32.5-//6(4)(i) states thnt areas outside of the affected (and shall be protected from slides or damnge occurring during the mining and reclamation operations. CORRECT/VE ACT/ON The operator shell submit a revision to the permit addressing the stability of the north pit slopes in relation to the South Platte River. Such revision shell contain measures to stabi4'ze the slope to ensure r/tnt the South Platte River is not impacted. Such revision is due on lanunry 9, 2002. " January 9, 2002 Aggregate Industries submits a Technical Revision (TR-04) to the Brighton Mine Permit. Revision includes the following; North Pi[ will be revised from a groundwater lake to a wetland habitat. Four feet of berm separating the pit from the South Platte River will be removed to facilitate floodwaters to enter and recede from [he pit. Demonsvates that the North Pit was approved for dewalering to facilitate reclamation. • Provide riverbank protection specifications [o encroach within 200 fee[ and 100 feet of the South Platte River in the Cenual and South Pits. January 18, 2002 DMG informs Aggregate Industries that changes in reclamation plan must be submitted as a Permit Amendment rather than a Technical Revision; The definition of Amendment as described in the COnsVncllon Material Rules and Regulations (Rule 1.1(6)) "means a change in the permit or an application which increases the acrenge of the affected land, or which has a significant effect upon the approved or proposed reclamation plan." The definition of Technical Revision as described in the Construction Material Rules and Regulations (Rule 1.1(49)) "means a change in the permit on mt application, which does nor have more than a minor effect upon the approved or proposed reclamation plan. " • Aggregate Industries proposes to change the reclamation plan of the North lake from a groundwater lake to constructed wetlands [hat allow Floodwaters to move through the area and return to the river. The approved reclamation plan (Permit Amendment 2000) states that the North Pi[ will be reclaimed to a groundwater lake with slopes no steeper than 3h:1 v. DMG considers this a significant change to the reclamation plan. The operator proposes to mine closer to the South Platte River which may increase the acreage of affected land (2,500 lin.ft. pit along the river could disturb between I and 5 acres). February 8, 2002 Aggregate Industries request the Division to reconsider filing [he changes as a Permit Amendment. February 11, 2002 Aggregate Industries extends the Division's decision date to February 22, 2002 and request that this issue be scheduled for the February 20, 2002 MLRB Hearing [o discuss if the changes in the reclamation plan can be filed as a Technical Revision rather than a Permit Amendment. February 18, 2002 DMG sends operator adequacy review regarding the technical issues surrounding [he revised reclamation (to get the ball rolling).