APPCOR12872

• Permit No: C1981044
• IBM Index Class Name: Application Correspondence
• Doc Date: 12/19/1980
• Doc Name: AVF GRANDFATHER REQUEST
• From: MLR
• To: EMPIRE ENERGY CORP
• Media Type: D
• Archive: No

-, '-
Memo-Roger Funs ton ,
February 22, 1980
Page -2-
aquifer. Add to Map III-1 coal subcrops under the Williams Fork
and Yampa Rivers.
3) The coal aquifers have not been described. Provide information
on their hydraulic characteristics, water quality, and zones of
recharge and discharge.
4) The baseline water quality for both surface and groundwater has
been limited to constituents in the effluent limitations. The
data should also show seasonal variations of major and minor
ions, and trace metals.
a) Present surface water data in three categories - the Yampa
River above the confluence, the Yampa River below the confluence,
and the Williams Fork River.
b) Groundwater data should be presented on the basis of individual
aquifers (Yampa alluvium, Williams Fork Alluvium, Trout Creek Ss,
Middle Ss, Twenty Mile Ss, and the coal aquifers).
5) Tables III-II and III-12 provide data on wells and springs in the
vicinity of the minesite. Which are wells, and which are springs.
These wells and springs should be located on a map. Provide the
seasonal discharge for each spring. Provide the seasonal water
quality for each spring.
6) The baseline conditions at this minesite include the effects of
past mining activities (surface and underground).
a) What effect has past underground mining activities had upon
groundwater quality and movement?
b) What effect has previous surface operations had upon groundwater
movement: Has a spoil aquifer reestablished itself? How does the
water quality in the spoils aquifer compare with that in natural aquifers?
c) What is the source of water pumped from the ~9 mine? Provide
information on the quality and quantity of this water.
PROBABLE HYDROLOGIC CONSEQUENCES - This section should be expanded to
discuss possible changes in surface water quality and quantity, ground-
water quality and quantity, and the recharge, movement, and discharge of
groundwater. (Discuss each groundwater aquifer separately). Changes
may or may not occur, but each aspect of the hydrologic system should
be discussed in terms of possible effects. Data and analysis should be
used to support all conclusions.
In addition some specific topics that should be discussed include:
1) Dewatering of coal and/or sandstone aquifers.
2) The possibility of a temporary reversal of the
piezometric surface in some aquifers during mining.
This analysis should consider the possible effects
upon surface flow and alluvial aquifers under a variety
of flow conditions (low, average, and high).