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1697 Cole Boulevard <br />Suite 200 <br />Golden, CO 60401 <br />Tel: (303) 239-5400 <br />Fax: (303) 239-5454 <br />BROWN AND ~ <br />C A L D W E L L <br />May 8, 2007 <br />RECEIVED <br />MAY 0 8 ypQl,.--- <br />Division of,l~~~~u~ <br />Mining and Safety <br />~ ~ ~ ~- <br />Ms. Erica Crosby <br />Environmental Protection Specialist <br />Division of Reclamation, Mining and Safety <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />Re: CEMEX Lyons Mine Permit M-1977-208 <br />Response to 4-23-07 Adeau~ Review T.etter ~~ <br />Technical Revision No. 8, C-Pit Hydrogeologic Investigations <br />Dear Ms. Crosby: <br />This letter addresses the four issues raised in the Division's Adequacy Review letter to <br />CEMEX of April 23, 2007. The four questions axe repeated below, followed by our <br />response. <br />1. The Division believes that an upstream ground water sampling location should be <br />considered to establish and further understand the upstream ground water parameters of <br />the C-Pit. Please address the need of establishing an upstream monitoring well and <br />sampling plan to establish baseline water quantity and quality. <br />Response: CEMEX agroes that the groundwater monitoring program for C-Pit should include <br />establishing baseline water quantity and quality. As noted an the March 3Q 2007 TR-8 proposal, we <br />have proposed a pbared approach that will frrt determrne the source(s) of water entering C-Pit and Refine the <br />hydrogeologic conditions of the .rite. Once thin information as fathered, we will then be able to determine an <br />appropriate location for sampling upgradientgroundwateranl establishing bareline conda'tions. <br />Our conceptual understanding of the .rite based an the presently available data it that groundwatergenemlly <br />flaws firm went to east. Therefore, prior to purposing along-term monitoring plan far tin? sate (see Response <br />3, below), an the interim CEMEX wall secure a sample ofgroundwater from one of the pie~ometers installed <br />to the west of C-Pit during Zhe first phase of the investigation. Such sampling may provide relevant <br />information on baseline conditions, and the results will be discussed in the report on the first phase of work <br />and factored into the long-term monidoring plan for this site. <br />Response w Adequacy Review -1'R 8 C-Pit.doc <br />