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2004-01-14_REVISION - M1980183
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2004-01-14_REVISION - M1980183
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Last modified
6/15/2021 2:15:28 PM
Creation date
11/22/2007 1:16:11 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1980183
IBM Index Class Name
Revision
Doc Date
1/14/2004
Doc Name
Amendment Application
From
Brannan Sand & Gravel Company
To
DMG
Type & Sequence
AM1
Media Type
D
Archive
No
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EXHIBIT G -WATER INFORMATION <br />The local water resources including wells, rivers, creeks and irrigation ditches aze shown <br />on Figure G-1, Water Resources and Well Locations. <br />Ground Water System <br />The existing and proposed mining operation is located in the alluvial plain of the South <br />Platte River. The alluvial deposit averages 50 to 70 feet in thickness. The underlying <br />aquifers include the Arapahoe and Laramie-Fox Hills. Slurry walls aze to be constructed <br />and shall act as a groundwater barrier. Therefore, the dewatering will not negatively <br />impact the waters of the South Platte River alluvium. The slurry wall will effectively <br />isolate the drawdown inside the slurry wall for water wells outside the slurry wall. No <br />impact to water wells will be seen. This is a great advantage to the traditional dry mining <br />technique. <br />Surface Water System <br />The dewatering, when needed, will be pumped to alternate gravel lakes. During phase <br />IV, the water will be pumped into the existing gravel lake in Area I. Then during phase <br />VI, the water will be pumped from Parcel A/C to the gravel lake in Area II. The storm <br />runoff from the site will be conveyed into the gravel pits, unable to travel to free bodies <br />of water. <br />• Water Requirements <br />I <br />Ground water will be consumed via evaporation and product water. Evaporation will <br />occur in the dewatering trenches. These trenches will surround the pit and be <br />approximately five feet wide. The evaporation lost in the dewatering depends on which <br />phase is being mined. With Phase IV there will be approximately 5,670 lineal feet of <br />trench, totaling 0.65 acres of exposed water surface. Phase VI will have approximately <br />7,400 lineal feet of trench for 0.85 acres of exposed water surface. Therefore, there will <br />be 1.61 acre-feet of evaporation with Phase IV and 2.11 acre-feet of evaporation with <br />Phase VI. <br />Water will also be lost in the mining product. The estimated annual production is <br />900,000 tons. The estimated water removed from the site is 4 percent by weight of <br />product. Therefore the resulting water depletion from removal of product is 26.49 acre- <br />feet. In summary, the total estimated water consumption during the mining phases is as <br />follows: <br />Annual Consumption <br />ase ase <br />Use (acre-feet) (acre-feet) <br />vaporalon <br />Product water 26.49 26.49 <br />Total 28.10 28.60 <br />Brannan Sand & Gravel Mining Application August 2003 <br />X:\1440000.a1P1445701\Word\[teports\Pem+it Amedmsnt-l2-I IA3.doc <br />
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