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Portland Plant Holcim (US) Inc. Phone 719 784 6325 <br />• 3500 Highway'120 Fax 719.784.3470 <br />' Florence, CO 81226 www.bolcim.comhrs <br />February-17, 2009 <br />Mr. Berhan Keffelew <br />Colorado Department of Natural Resources <br />Division of Reclamation, Mining and Safety <br />1313 :Sherman Street,, Room 215 <br />Denver, CO 80203 <br />Re: Proposed Groundwater Monitoring Plan,. DBMS<Permit M-1977=344 <br />Dear Mr. Keffelew, <br />The purpose of this groundwater monitoring plan (GMP) is to fulfill the requirements of <br />Technical Revision ##6 (TR-06) to the Division of Mining, Reclamation and Safety.Permit M- <br />1977-344. This. permit'is_forthe Holcim (US) Portland Plant.quarry located,adjacent to the <br />cement plant in Florence, Colorado. <br />The quarry is located on the north side of the Arkansas River. Groundwater in the area flows in <br />a generally southerly direction toward the river. See Figure 2 attached from the March 2008 <br />Groundwater Monitoring Report. <br />Holcim proposes annual sampling of the following monitoring wells: <br />• MW-12 -.Background well located in the north end of the quarry. <br />•, MW-7 Compliance well located in the southwest side of the quarry, <br />• MW-13* - Compliance well to be located in the south side of the quarry in close proximity <br />to Piezometer P-3 near the entrance to the quarry. <br />* Note, this well is proposed to be: drilled in April 2009 and will be a 2" ID Schedule 40 PVC. well <br />approximately 50 feet in depth: <br />ln'addition, Hplcim will continue monitoring water level in wells P-2;.P=3; MW=9; and W-11. <br />Holcim proposes abandoning the following wells: <br />MW-6 ;.-this well is located next to MW12. and,is thus redundant and, unnecessary. <br />MW-8.- this well is located'in an area that will be reclaimed, _i.e., buried, in 2009. <br />MW-10.- this well, is too shallow:to provide useful data. <br />The: wells will be abandoned in accordance with Colorado, rules and. regulations governing:well <br />abandonment.