PERMFILE134285

• Permit No: C1996083A
• IBM Index Class Name: Permit File
• Doc Date: 10/12/2005
• Section_Exhibit Name: 2.04 Information on Environmental Resources
• Media Type: D
• Archive: Yes

• 2.04.7
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ROLLINS SANDSTONE WATER QUALITY
Alkalinity Chloride Sodium TDS
BRL #2 DH-34B 3430 625 1940 4660
BRL #2 NM4X98-29 3420 540 1560 3670
BRL #2TC-03-01 (R) 1996 460 1030 3250
Oxbow - SC-1 2580 3140 3120 7400
Oxbow - SC-2 3540 3150 3450 8500
MCC SOM-128-H 3940 2610 3060 8230
Reference: SOM 1992 AHR, MCC 1994 AHR
In general, groundwater within the Mesaverde Formation is of sodium
bicarbonate type, and the total dissolved solids ranges from 900 to 8,960
ppm. High mineralization and high sulfate and sodium content of this
groundwater precludes the use for potable, stock and irrigation purposes.
Electrical conductance and total dissolved solids values from Mesaverde
sou rces are typically a factor of ten higher than similar parameters measured
from colluvial, near surface water sources (2,000 to 8,000 umhos v.s. 200-
800 umhos, respectively). The notable difference in water quality clearly
separates the groundwater systems and suggests the longer residence time
(and lower transmissivity) of the water within the bedrock Mesaverde (refer to
Groundwater Monitoring results).
Potential recharge to the Mesaverde Formation occurs within the major
stream drainages, while flowing, (Brooks,1983). Additional recharge of much
smaller magnitude could occur at the outcrop, yet the near vertical exposures
and sporadic precipitation precludes any large scale infiltration.
Uaper Perched Water Zone and Rollins Sandstone
The interpretation of the groundwater presence in the Mesaverde Formation
is based on the observation of water presence during the exploration drilling,
water level measurement during the geophysical well logging, and water
level measurements in the monitoring wells. The results of this interpretation
are shown on Maps 10 and 11. These maps show the perched water
2.04 - 27 - 09/05