REP42763

• Permit No: C1980003
• IBM Index Class Name: Report
• Doc Date: 11/30/1995
• Doc Name: 1994 AHR DIVISIONS REVIEW
• From: DMG
• To: HAYDEN GULCH AHR FILE
• Annual Report Year: 1994
• Permit Index Doc Type: HYDROLOGY REPORT
• Media Type: D
• Archive: No

III IIIIIIIIIIIII III
999
STATE OF COLORADO
DIVISION OF MINERALS AND GEOLOGY
Depanmem of Natural Resources
1717 Sherman St., Room 215
Denver, Colorado 80207
Phone: [phone]
FA%:1303)R32-R106
DATE: November 30, 1995
II~
DPPARTMENT OF
NATURAL
RESOURCES
Rny Rome
Governor
TO: Hayden Gulch AHR File WmesS Lochhead
Execw rve Dueaw
FROM: Joe Dudash ~ ~ h,ichae~ R. Lnns
IvA*Jl Drvis ion Director
RE: Division's Review of 1994 AHR, Hayden Gulch Mine, Permit No.
C-80-003, Hayden Gulch Terminal
The Division reviewed the 1994 Annual Reclamation Report and Annual
Hydrology Report for the Hayden Gulch Mine. The Division sent a
letter, dated November 30, 1995,. to TerraMatrix which contained
fourteen questions concerning the report. This memo to file has two
main parts. First is a summary of the Division's review of the 1994
report, labeled section 1 through section 4. Second is the list of
fourteen questions sent to Terramatrix, labeled section 5.
1. PERMIT MONITORING PLAN VS AHR MONITORING PLAN
The 1994 ARR showed surface water and groundwater monitoring site
locations on Map 1, Environmental Monitoring and Sampling Sites.
The permit application shows the surface water monitoring locations
on the map entitled "Surface Water Sampling Site Map", found in
Volume 1B. Both maps are in agreement as to the location of the
upstream surface monitoring site, labeled UHG-1 in the 1994 ARR.
However, the permit application map shows the downstream monitoring
site as being just below the outfall of pond HG-8. The 1994 ARR map
shows the downstream monitoring location, labeled LHG-1, as being
about 3500 feet further downstream. The Division raised this
possible discrepancy, in question no. 14, to TerraMatrix.
The groundwater monitoring sites are located on the permit
application map entitled "Final Reclamation Map, 1988." The well
locations coincide with the well locations shown on the 1994 ARR
map. The Division pointed out, in question no. 2, that there was a
discrepancy in well annotation for UC-2 on Map 1 of the 1994 ARR.
Well HG-1 monitors groundwater down dip of the shop area. Well HG-2
monitors groundwater down dip of the mine area. Well UC-2 monitors
only water depth up dip from the shop area.
The locations of the springs and seeps and of the NPDES outfall are
shown on the 1994 ARR Map No. 1, Environmental Monitoring and
Sampling Sites.