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<br />RECEIVED <br />AUG 2 8 2003 / <br />Division of Minerals and Geology <br />f <br />emo ,~~~ ~ ~ ~,~ <br />To: Jeff Simonson, City of Rifle Engineer, Garfield County Reviewing Engineer <br />CC: Bill Sappington, City of Rifle Public Works Director <br />:Gregg Squire, Division of Minerals and Geology, <br />Mazk Bean, Garfield County Planner <br />Rodney Johnson, LaFarge <br />From: Leslie Hope, High Country Engineering, Inc. ~Q~ <br />Date: August 25, 2003 <br />Re: Revision to Berm Detail, DMG File No. M-2000-113 <br />HCE Proyect No: 2011041.74 - Mamm Creek Gravel Pit ~ ° - <br />The purpose of this memorandum is to revise the flood control berm detail dated November <br />25, 2002. The proposed berms aze located along the north perimeter of the gravel sites and <br />will be installed at the begmnntg of the active mining in the pits. Per the original detail, the <br />berm for Pit #1 required 24" diameter riprap along the faces of the berm. Since angulaz riprap <br />is not readily available for this pit; we recommend installing North American Green C350 (or <br />approved equal) in place of the riprap. -The installation of the Erosion Control Blanket will <br />follow the manufacturers' recommendations; which includes properly staking the blanket and <br />keying it into the slope. The toe of the berm on the side of the Colorado River will be <br />additionally armored with 24" riprap. In addition to providing the necessary erosion <br />protection, this erosion blanket will be seeded and irrigated to provide a more natural <br />appeazance to the flood control berm. Please see the attached specifications and revised detail. <br />If you have any additional questions, please feel free to give me a call. _ <br /> <br />1517 Blake Avenue, SLite 101 <br />Glemvood Springs, CO 81601 <br />Telephone (970) 945-8676 -Fax (970) 945-2555 <br />14lavemess Drive Fast S7tite D-136 <br />Englewood, CO 80112 <br />Telephone (303) 925-0544 -Fax (303) 925-0547 <br />