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RE: Request for Technical Revision to increase bonded area September 10, 2008 <br />of M-1999-120, Fort Lupton Sand and Gravel Mine <br />Swinale-North area <br />The land area which will be the Swingle-North Pit is located in the north-west section of the <br />permitted area. The slurry wall will be constructed along the boundaries as shown on the <br />attached mining plan map. As is shown in the Mining Phases table on the map, the acreage to <br />be mined is 37 acres, the perimeter length is 5,304 feet, and the average depth to shale <br />bedrock is estimated at 29 feet. The estimated total area of the slurry wall is 153,816 square- <br />feet. The estimated slurry wall liner thickness will be 3 feet. <br />Swingle South area <br />The land area which will be the Swingle-South Pit is located in the south-west section of the <br />permitted area. The slurry wall will be constructed along the boundaries as shown on the <br />attached mining plan map. As is shown in the Mining Phases table on the map, the acreage to <br />be mined is 38 acres, the perimeter length is 5,024 feet, and the average depth to shale <br />bedrock is estimated at 29 feet. The estimated total area of the slurry wall is 145,696 square- <br />feet. The estimated slurry wall liner thickness will be 3 feet. <br />Please note that part of Swingle-South Pit (23 acres) was bonded to allow for stockpiling and <br />settling ponds in the TR-1 approval, dated February 27, 2006. <br />If you have questions or need anything else to complete the bonding calculations and finalize <br />the approval for this TR, please feel free to contact me directly at 303-286-2247 or via email at <br />Imshults@lgeverist.com. <br />Note: In a separate submittal, titled "Request for Release of Performance and Financial <br />Warranties," dated September 10, 2008, we are requesting a partial release of the financial <br />warranty (bond) associated with the construction of the slurry wall liner around the Golden <br />phase of the mine. We would greatly appreciate if the Division calculates the two financial <br />warranty changes together (this TR additional bond and the partial release) and then requires <br />us to make only one financial warranty adjustment for the site. Thank you. <br />Sincerely, <br />Lynn Mayer Shults <br />Regulatory Manager <br />cc: Steve Mousel, Dennis Fields, Richard Schneider <br />FL-DRMS-TR-bondParPanSwi-091008.doc sent via Certified Mail # 7007 3020 0001 1230 6097