REP18925

• Permit No: C1980006
• IBM Index Class Name: Report
• Doc Date: 9/5/2006
• Doc Name: 2005 AHR Response to Review Letter
• From: Northwest Colorado Consultants Inc
• To: DRMS
• Annual Report Year: 2005
• Permit Index Doc Type: Hydrology Report
• Media Type: D
• Archive: No

olorado Consultants
Geotechnital !Environmental Engineering • Materials Tetting
RECENT,
SEP 0 5 2006
pivision of RecSa e Y n.
M~nin9 and
September 1, 2006
Mr. Jim Bumell
Colorado Department of Natural Resources
Division of Minerals and Geology
1313 Sherman Street Rm. 215
Denver, CO 80203
Subject: Responses to 2005 AHR Review
Marr Mine -Permit No. C-80-006
Jackson County, Colorado
Dear Mr. Bumell:
Project No. 05-6371
On behalf of Kerr Coal Company (Kerr or KCC), NWCC, Inc. is pleased to provide you with 2
copies of the responses to the 2005 AHR Review for the Marr Mine, Permit No. C-80-006. The
responses pertain to the review document provided by The Colorado Division of Minerals and
Geology (CDMG) dated August 3, 2006. The Division comments and the Kerr responses are
provided below.
1. "Please note That the data for well 79-61 was either left off the diagram (fig. 1) in the
current AHR or the overlapping symbols make it unclear if the triangle representing well 79-61
data is present. If the latter is the case, please take care to resubmit that page and clearly show
fhe data for well 79-61."
Response: Kerr acknowledges that the graphical presentation provided in the AHR is too small
making the symbols overlap. The symbols for wells 79-61 and 79-3 were overlapping at that
scale. Enclosed is a new figure {Figure 1A) which can be added to the existing document
following page 5. Note that historical water levels for well 79-3 have been added to the graph.
2. "Please explain the situation with groundwater well 79-3. The diagram shows no historic
values, only 2005 values"
Response: According to the permit, monitoring in Well 79-3 was not required during the active
mining phase except for water levels. TR-19 included a request to revise the Water Monitoring
Plan (1991). The revised Monitoring Plan as well as the origina! identified 79-3 as a "bedrock
water level well" (BL). Monitoring for water quality was therefore necessary only during the last
2 years prior to bond release. Therefore there is no analytical data for this well included in any
Annual Hydrology Report dating back to 1989. Exhibit 55 does incude baseline water quality
data for the well (Affected Groundwater) dated 1979 and 1980. The water level data has not
been included in the previous AHRs. We have revised the 2005 AHR to include the historic
water level information. The altered pages to the AHR are enclosed and should replace the
same page numbers in the original document.
3. "Table 6 is mislabeled. It should read "coal seam water'.
Response: Table 6 has been revised accordingly as well as the Table of Contents and page 3 of
the AHR. The revised pages are enclosed and replace the same page number in the original
document.
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