Laserfiche WebLink
tiT IRIS <br />MITIGATION AND DESIGN, INC. <br />Environnrental Consulting <br />IRIS MITIGATION AND DESIGN, INC. <br />2022 Arapahoe Street <br />Golden, Colorado 80401 <br />Phone: 720- 272 -1985 <br />hleisure@irismitigation.com <br />2012 PHASE 1 CUT -OFF WALL CONSTRUCTION <br />ACTUAL AREA IMPACT AT THE SCHWARTZWALDER MINE <br />Purpose and Need <br />The purpose of this 2012 Schwartzwalder Mine Actual Area Impact Report is to report to both <br />the U.S. Army Corps of Engineers (USAGE) and to the U.S. Fish and Wildlife Service (USFWS) <br />on the construction activities as completed by Cotter Corporation (N.S.L.) (Cotter) in 2012 at the <br />Schwartzwalder Mine (the Site) located in Golden, Colorado. These construction activities were <br />detailed in the August 2011 Wright Water Engineers Inc. (WWE) Pre - Construction Notification to <br />the USAGE for the proposed "Ralston Creek Temporary Diversion Project ". The USACE file <br />number for the project is NOW- 2011- 1353 -DEN. This project involved the Phase 1 installation <br />of an upstream cut -off wall across the creek and the installation of an 18 -inch pipeline around <br />the Site. The USACE permit for this proposed work was obtained on November 25, 2011. <br />As part of the Phase 1 permitting process, the USAGE consulted with the USFWS regarding the <br />project because Ralston Creek is considered critical habitat for the federally threatened Preble's <br />Meadow Jumping Mouse (PMJM) (Zapus hudsonius preblei). IRIS Mitigation and Design, Inc. <br />(IRIS) prepared a Biological Assessment dated August 2011 as a required part of the USACE <br />Pre - Construction Notification process regarding the PMJM and associated habitat impacts. The <br />Schwartzwalder Mine Actual Area Impact Page 1 <br />January 2013 <br />