2006-02-02_REVISION - M1999120 - Laserfiche WebLink

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RE: Fort Lupton Sand and Gravel Mine, DMG Permit #M-1999-120, Revision AM-1 Request for Technical Revision for bonding of new phases, and submittal of groundwater monitoring data Fort Lupton Sand and Gravel Mine -Golden Pit The land area which will be the Golden Pit is located east of the original permitted area. This area is shown on the attached mining plan map. The total permitted area is 34 acres, with 20 mine-able acres. The perimeter length of the slurry wall will be 3,790 feet. The average depth to bedrock is 50 feet. So the estimated total area of the slurry wall is 189,500 square- feet. The estimated slurry wall liner thickness will be 3 feet. The underlying material that we will be keying the slurry wall into is Pierre Shale. There are no faulf lines running through the property. This area will be mined and reclaimed as per our approved Amendment. Fort Lupton Sand and Gravel Mine - Swincale South Pit We would like to stockpile materials in approximately 10 acres in the southeast corner of the Swingle South Pit. We will not be mining that area yet, but will mine it at a later date. At this point, we just need more area to stockpile materials, In the Amendment paperwork, the area was actually proposed as "Plant and Stockpile Location 3." At this point, the processing plant will stay where it has been located - in the southwest corner of the original pit. We will add a conveyor on the west side of the processing plant to convey the materials into stockpiles in the Swingle South Pit, and a gravel road for access. Prior to stockpiling materials, we will strip the topsoil and overburden in this area, some will remain in the area in stockpiles, and some will be used for reclamation in other mining areas. Stockpiled topsoil and overburden will be vegetated with the approved temporary seed mix. General Information for all three areas The processing plant, fuel, and chemical storage will remain where they are currently located, which is in the southwest corner of the original pit. The original pit is surrounded by a slurry wall which has been approved by the Office of the State Engineer. Submittal of Groundwater Monitorinn Data While we were reviewing all the Fort Lupton permitting paperwork, we realized that the DMG requested us to submit "one year's worth of groundwater data" prior to installation of new slurry walls. !n the adequacy process of this amendment, we submitted monitoring data from May-2004 through December-2004. We are now submitting groundwater monitoring data from May-2004 through January-2006 for baseline groundwater monitoring numbers prior to constructing new slurry walls. There are three attachments related to this data: a map with the monitoring well locations for reference, and two worksheets with the data -one has the original data and more location information, the other has calculated 3-month and seasonal groundwater average depths for all the groundwater wells. We have not mined in any new areas during the time period of data collection (May-2004 through January-2006), and the SEO approved the slurry wall liner of our current mining operation in October-2004. However, there are three other mining operators in close proximity to our location who have started new (or continued) mining operations during this time period. Directly south is the RJ Campbell Pit #1, M-2002-104; and to the north are the NCCI Pit, M-2001-107, and the Heit Pit, M-2003-016. Some of our groundwater monitoring wells are very close to these other operations, and the groundwater levels we monitor in these wells could be affected by them. As we open new mining areas, we just want the Division to have a reference of other operations in our area that could affect groundwater levels. Other influences to groundwater levels include irrigation and precipitation amounts. LMIFL-TR-GoldenH i I IOakley-013006. doc