2008-03-03_PERMIT FILE - C2006085 ‎(2)‎

• Permit No: C2006085
• IBM Index Class Name: Permit File
• Doc Date: 3/3/2008
• Section_Exhibit Name: 2.04 Information on Environmental Resources
• Media Type: D
• Archive: No

. test data from residential water supply wells in well driller and pump
installation reports. These test data are informal but specific capacities
determined from these test data provide an indication of the low
aquifer transmissivity and hydraulic conductivity of these formations.
The table below presents a summary of representative well data,
including specific capacity values. The average specific capacity value
for these wells is 0.006. Base on EPA Ground Water Handbook, 1989,
and Ground Water and Wells, Johnson, 1986, multiplying the specific
capacity in a confied system by a factor of 2000, the estimated
transmissivity of the formation material is 12 gpd/ft. Assuming a
conservative low saturated thickness value of 50 feet, the estimated
hydraulic conductivity value is 0.24 gpd/ft2. This value is low and is in
line with vallues of tight silt and cemented sandstone. For the
purposes of comparison, we note that the hydraulic conductivity of
productive aquifer sands is on the order of 1000 to 5000 gpd/ft2, or
four orders of magnitude higher than the estimated hydraulic
conductivity of the formation material.
-~
~J
Permit No. Pumping
Rate
(gPm) Static Water
Level (ft) Pumping
Water Level
(~) Drawdown
(ft) Specific
capacity
(gPm/ft of
drawdown)
248244 1 380 540 160 0.006
243372 1 357 460 103 0.010
248451 '~, 1 303 460 157 0.006
248242 5 370 510 140 0.007
222887 1 305 600 295 0.003
A review and evaluation of nearby water supply wells was completed,
including well logs, well locations, and water level information. In
addition, thE~ potential impact of the mine operations on nearby wells
was evaluated. This research included a review of the well records for
wells within 1 mile of the permit boundary and a determination of
completion intervals for the nearby wells using GIS software. Based
on the analysis of completion interval and the geology of the mine
area, a comparison of the well completion elevation and Ocean Wave
elevations was completed. The results of this comparative analysis
indicate that: there is only one well of the 166 nearby wells that may be
completed in the Ocean Wave coal seam.
2.04-19 Revised 11/05/07