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RECEIVED <br />AllG 2 8 ZOU3 <br />Division ~f Minerals and Geology <br />Memo <br />To: Jeff Simonson, City of Rifle Engineer, Ga~eld County Reviewing Engineer <br />CC: Bill Sappington, City of Rifle Public Works Director <br />Mark Bean, Garfield County Planner <br />Rodney Johnson, LaFazge <br />From: Leslie Hope, High Country Engineering, Inc. ~ /~ <br />Date: August 25, 2003 (/ ~~_ 6 Z. <br />Re: Revision to Berm Detail, DMG File No M-2000-113 ,__ <br />ACE ProjectNo: 2011041.74 -1Vlamm Creek Gravel Pit .~- <br />The purpose of this memorandum~ls to revise the flood control berm detail dated November <br />25, 2002. The proposed berms are located along the north perimeter of the gravel sites and <br />will be installed at the beginriing of the active mining iri the pits:::.Per the original detail, the <br />berm for Pit #1 required 24" diameter riprap along the faces .of the berm Since angular 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 installahon of the Erosion. Control Blanket will <br />follow the manufacturers' recoinulendations, which includes'pioperly 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 &ee to give me a call. <br />'_ _ - _ <br />\_;~G <br />yrk ~r° <br />1517 Blake Avemu, Sttire 101 <br />Glenwood Springs, CO 81601 <br />Te]ephone (970) 945-8676 -Fax (970) 945-2555 <br />14lnvenrss Ihive East Sd[e D-136 <br />Englewood, CO 80112 <br />Telephone (303) 915-0544 - Fax (303) 925-0547 <br />