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GENERAL51479
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Last modified
8/24/2016 8:37:43 PM
Creation date
11/23/2007 6:50:23 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981012
IBM Index Class Name
General Documents
Doc Date
12/14/1983
Doc Name
PROPOSED DECISION AND FINDINGS OF COMPLIANCE
From
The Allen Mine
Permit Index Doc Type
FINDINGS
Media Type
D
Archive
No
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-30- <br />i~L <br />E. Water Use <br />Ground water used in the area comes primarily from shaliow alluvial sources. <br />This water is used primarily far domestic, livestock and irrigation purposes. <br />Alluvial ground water is also used for municipal water downstream from the <br />mines. <br />A few deeper wells in the vicinity of the Allen Mine may tap bedrock ground <br />water sources. Two of these wells are used for the mining operation at the <br />Allen Mine. Water from these bedrock wells is used for domestic and <br />industrial purposes. <br />Surface water within the Purgatoire River basin is used primarily for <br />irrigation of strath and alluvial terraces. The width of the valley ranges <br />from a few hundred to a few thousand feet. Where the geometry of the valley <br />permits, limited flood irrigation is practiced. It is estimated that 6,000 <br />ac-ft are diverted from the Purgatoire for irrigation above the Madrid <br />station. Irrigated lands are, for the most part, located on the strath <br />terraces. Irrigation on the lower alluvial terraces is also practiced, but <br />the small size often precludes viable irrigated agriculture. Much more <br />extensive irrigation occurs in the valley downstream of Trinidad. <br />Surface water is also used for domestic, livestock, and municipal purposes. <br />PROBABLE HYDROLOGIC CONSEQUENCES OF MINING <br />A. The Maxwell Mine <br />Mining activities at the Maxwell Mine began in 1976. Most of the activity has <br />been in the development of surface facilities and mains in anticipation of <br />future coal production. Hydrologic effects from this operation would be <br />expected to increase with future mining activities. Most of these effects <br />have been assessed in the applicant's hydrologic analysis provided in Exhibit <br />6 of the permit application. <br />Underground mining activities at the Maxwell Mine are expected to temporarily <br />dewater the Maxwell and Allen coal seams (the coal seam aquifer). The average <br />mine discharges measured during the third quarter of 1983 at the Maxwell Mine <br />are higher than those measured during the period when the hydrologic report <br />contained in Exhibit 6 was prepared. The present discharge rate is 30 gallons <br />per minute (gpm), whereas the previously reported discharge rate was 15 gpm. <br />This increased discharge rate can be attributed to lower water consumption, <br />since the mine is inactive. During mining, water was consumed through <br />absorption into coal exiting the mine and increased evaporation into the <br />ventilation air. Currently, coal is not mined and ventilation air volumes are <br />reduced. <br />The applicant has estimated that inflow to the Maxwell Mine from the coal seam <br />and roof would be between 159 gpm and 193 gpm depending upon the average <br />transmissivity of the material encountered. This dewaterin9 will create a <br />drawdown of the piezometric surface in the coal seam in and around the mine. <br />Drawdown of afoot or more could extend outward as far as 2 to 3 miles from <br />the Maxwell Mine (see Exhibit 6 of the Maxwell permit application). <br />
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