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2012-06-20_PERMIT FILE - C2010089 (84)
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2012-06-20_PERMIT FILE - C2010089 (84)
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Last modified
8/24/2016 5:01:21 PM
Creation date
8/27/2012 9:48:04 AM
Metadata
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Template:
DRMS Permit Index
Permit No
C2010089
IBM Index Class Name
PERMIT FILE
Doc Date
6/20/2012
Doc Name
BBA Water Consultant Report
Section_Exhibit Name
Appendix 2.05.6(3)-1a
Media Type
D
Archive
No
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Murari P. Shrestha, P.E. <br />August 25, 2010 <br />Page 3 <br />To determine aquifer characteristics for the Brushy Basin Formation, we relied on the <br />pump test information from the permit files available from the State Engineer's Office. <br />From this information, we determined a transmissivity of approximately 530 gallons per <br />day per foot (gpd/ft) for the bedrock material. We also determined a storage coefficient of <br />0.0001 based on the characteristics presented in the mine permit documents and our <br />experience with ground water pump testing and characteristics. <br />We relied on the estimated potable water requirements presented above. Based on an <br />annual demand of approximately 0.61 af/yr, the annual average pumping rate for wells at <br />each mine location is approximately 0.38 gallons per minute. This amount is consistent <br />with the expected annual demand for a single family home. <br />We determined centroid locations for the New Horizon North and Cyprus Block mine <br />properties based on the well field areas claimed in the client's recent water court <br />application and locations where Western Fuels indicates wells may be constructed. The <br />analytical approach was identical for both the Cyprus Block Property and New Horizon <br />North because water supply wells will produce from the Brushy Basin Formation at both <br />locations and the Brushy Basin Formation is present at similar depths at each of the two <br />mine locations. <br />Distances from these centroid locations to nearby wells were measured using GIS <br />methods and the well locations for nearby wells, as indicated in the State's Master Well <br />List database. Existing neighboring production wells were identified from the Master <br />Well List, as summarized in Table 2 and Figure 1. For wells located within 1000 feet <br />from the mine boundary, a distance of 600 feet was conservatively assumed, which is the <br />distance used by the State Engineer's Office to determine whether or not the applicant for <br />a new well permit needs to pursue a 600 -foot spacing waiver. <br />Projected drawdowns at the identified neighboring wells were calculated using the <br />aquifer characteristics identified above, the measured distances and the Theis equation. <br />A pumping period of 20 years was assumed for this analysis. The pumping was modeled <br />such that all of the demand was supplied from one well located at the centroid location, <br />although up to five wells may be constructed at each mine property. <br />Based on our analysis, new wells constructed and operated at the New Horizon North and <br />Cyprus Block mine properties may cause a small change in water level in neighboring <br />wells. The change in water level resulting in neighboring wells resulting from wells used <br />to meet the demand at the New Horizon and Cyprus Block properties is quite small, on <br />average approximately 0.53 feet with a maximum change of approximately 0.85 feet. <br />Where data are available to analyze available water level drawdown in the neighboring <br />wells, the projected change is on average approximately 0.11% of the available <br />drawdown at the Cyprus Block location and 0.45% at the New Horizon North location, <br />with a maximum projected change of 1.29% of the total available drawdown occurring in <br />permit number 39696, resulting from well pumping at New Horizon North. A summary <br />of the neighboring wells and the water level change calculations has been presented in <br />Table 2. The analysis assumes full connection across the aquifer between the Western <br />Fuels wells and all of the wells indicated in Table 2, which is a conservative assumption. <br />As indicated, the change in water level resulting from the operation of up to five potable <br />www.bbawater. <br />
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