2019-05-03_HYDROLOGY - M1977344 - Laserfiche WebLink

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Portland Plant Holcim(US)Inc. Phone 719 784 6325 OlCiM3500 Highway 120 Fax 719 784 3470 'inH Florence,Co 81226 www.holcim.com/us February 17, 2009 Mr. Berhan Keffelew Colorado Department of Natural Resources Division of Reclamation, Mining and Safety ' 1313 Sherman Street, Room 215 Denver, CO 80203 Re: Proposed Groundwater Monitoring Plan, DRMS Permit M-1977-344 Dear Mr. Keffelew, The purpose of this groundwater monitoring plan (GMP) is to fulfill the requirements of Technical Revision #6 (TR-06) to the Division of Mining, Reclamation and Safety Permit M- 1977-344. This permit is for the Holcim (US) Portland Plant quarry located adjacent to the cement plant in Florence, Colorado. The quarry is located on the north side of the Arkansas River. Groundwater in the area flows in a generally southerly direction toward the river. See Figure 2 attached from the March 2008 Groundwater Monitoring Report. ' Holcim proposes annual sampling of the following monitoring wells: • MW-12 - Background well located in the north end of the quarry. • MW-7 - Compliance well located in the southwest side of the quarry. ' • MW-13*- Compliance well to be located in the south side of the quarry in close proximity to Piezometer P-3 near the entrance to the quarry. * Note, this well is proposed to be drilled in April 2009 and will be a 2" ID Schedule 40 PVC well approximately 50 feet in depth. In addition, Holcim will continue monitoring water level in wells P-2, P-3, MW-9, and MW-11. Holcim proposes abandoning the following wells: • MW-6 - this well is located next to MW12 and is thus redundant and unnecessary. • MW-8 - this well is located in an area that will be reclaimed, i.e. buried, in 2009. • MW-10 - this well is too shallow to provide useful data. The wells will be abandoned in accordance with Colorado rules and regulations governing well abandonment.