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• <br />Ali ro a C. <br />LARRY E. O'BRIAN 7985 VANCE DRIVE, SUITE 205A <br />FOUNDER ARVADA, COLORADO 80003 <br />STEVAN L. O'BRIAN 303 - 423 -7297 <br />PRESIDENT FAX 303 - 423 -7599 <br />September 25, 2014 <br />Mr. Tyler O'Donnell <br />Division of Reclamation, Mining & Safety <br />1313 Sherman St, Suite 215 <br />Denver, CO 80203 <br />Dear Tyler; cr-ft. <br />SEP c <br />RE: Albert Frei & Sons, Inc. 3 0 X014 <br />Worthing Pit - Update -1CeF <br />M.L.R.B. Permit # M -1977 -526 /At/NGq /VDSA amply <br />On behalf of my client Albert Frei & Sons, Inc. I am submit- <br />ting this correspondence to update and keep you appraised of what <br />Albert Frei & Sons, Inc., is doing to investigate and mitigation <br />the ground water issues along the south end of the permit area. <br />In the last update (9/5/14) we explained that once the Stagecoach <br />Pit investigation ended we would begin to look into this area <br />with the main idea to install a drainage ditch and /or pipe from <br />the historic slough /groundwater drain to the South Platte River. <br />Included in the commitment was a plan to review the current <br />groundwater drain trench to see if it needed additional improving <br />and /or redesign. <br />The proposed drainage structure would parallel the south <br />line of the water intake easement that bisects the southern <br />mining area. The idea is to construct the drain and improve the <br />trench and slough to establish a groundwater elevation that is at <br />or just below the historic groundwater elevations for the prop- <br />erty prior to backfilling. <br />Deere and Ault Consultants was retained on September 16, <br />2014 to do a site analysis and design plan for installing the <br />drain to the river. Albert Frei & Sons, will also be upgrading <br />the groundwater trench, if appropriate, along the east side of <br />the southern backfilled area as part of the project. Because the <br />drain will enter the river along a section where Urban Drainage <br />armored the river bank, they were contacted to see what was <br />needed to cross their easement and terminate the drain at the <br />river. They requested a conceptual plan prior to giving a go <br />ahead. Deere and Ault completed their site visit on last Friday <br />(9/19/14) and have started preliminary planning. <br />Gillian's Surveying was retained to survey the location of <br />the drain and obtain the elevations Deere and Ault will use to <br />design the drain. They will also collect elevations along the <br />