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precipitation events or seasonal increases in flow from the tunnel have also <br />continued to cause direct discharges of.acid mine drainage and sediments with <br />hazardous substances to Clear Creek. <br />Construction and operation of the ARGO Tunnel Water Treatment Facility and <br />design and construction of the Virginia Canyon Ground Water Collection and <br />Conveyance system, pursuant to the OU 3 ROD, and potential coordination with <br />other construction projects in the area have provided a cost effective alternative for <br />including the Big Five Tunnel discharge in the individual control strategy for the <br />Argo Tunnel. <br />+ Remedial action as a part of Operable Unit 2 (OU 2) to cap and stabilize the Big <br />Five mine waste pile, a source of metals loading to Clear Creek, was completed in <br />July 2000. The Big Five Tunnel discharge was not considered under this action. <br />Addressing the discharge under the remedy presented in this ESD will complete <br />remediation of the Big Five area and eliminate it as a source of contamination. <br />This ESD provides a brief history of the SITE, describes the alternative selected in the OU 3 ROD, <br />and explains how the proposed remedy differs from the alternative. It also discusses the proposed <br />remedy's compliance with all legal requirements and provides details on how the reader may obtain <br />more information on the SITE. <br />is This document presents only a synopsis of information relating to the SITE. This ESD and its <br />supporting documentation will be incorporated into the Administrative Record pursuant to NCP <br />300.825(a)(2). The Administrative Record file is available for public review at the following <br />locations: <br />1) Upper Clear Creek Watershed Association <br />c/o: R.L. Jones <br />2060 Miner Street, Suite 201 <br />Idaho Springs, Colorado 80452 <br />(303) 567-4324 <br />2) U.S. Environmental Protection Agency <br />EPA Records Center <br />99918th Street <br />Denver, Colorado 80202 <br />(303) 312-6473 <br />3) Colorado Department of Public Health and Environment <br />Hazardous Materials and Waste Management Division <br />4300 Cherry Creek Drive South <br />Denver, Colorado 80246 <br />(303) 692-3300 <br />0 <br />2