REP40786

• Permit No: C1981029
• IBM Index Class Name: Report
• Doc Date: 4/6/1989
• Doc Name: MEADOWS 1 MINE FN C-81-029 1988 REVEGETATION MONITORING REPORT
• From: MLRD
• To: SUN COAL CO
• Permit Index Doc Type: REVEG MONITORING REPORT
• Media Type: D
• Archive: No

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STATE OF COLUIZADO
Roy Romer, Governor
DEPARTMENT OF NATURAL RESOURCES
MINED LAND RECLAMATION DIVISION
FRED R. BANTA, Dlreotor
April 6, 1989
Mr. Bryan J. Archer, Manager
Sun Coal Company
5440 Ward Road
Suite 210-7
Arvada, Colorado 80002
RE: Meadows No. 1 Mine, File No. C-81-029,
1988 Re vegetation Monitoring Report
Dear Mr. Archer:
As you know, we conducted a sampling program at your mine for vegetative cover
on August 12, 1988. Sun Coal Company, Inc. (SCC) personnel sampled the pit
area from September 5 through September 7, 1988.
We have reviewed your sampling program and compared it's results with results
from our program. We have several concerns with your submittal as identified
below:
1. There are no raw data with the submittal, thereby making it impossible
for the Division to verify tables, graphs, results, statistics or
conclusions.
2. The sampling was conducted across all four reclaimed areas. This
presents problems in achieving sample adequacy for cover and production.
Sample adequacy at the 80% confidence limit for production was not
reached after forty-five samples. In the future it is recommended that
samples be stratified according to plant community (seeded area).
Results could then be weighted and averaged later for total vegetated
area comparisons with the Seneca II Mountain Brush reference area. This
type of sampling strategy is the one that CMLRD used and has the benefit
of making sample adequacy easier to reach. This also allows illustration
of possible problems in individual plant communities. It can then be
inferred which areas require additional re vegetation work.
3. Sample adequacy calculations were performed at the 80% confidence limit
instead of the 90% limit required by CMLRD.
4. Mean (average) and standard deviation figures and calculations for total
vegetative cover and production are not provided.
215 Centennial Building, 1313 Sherman Street Denver, Colorado 80203-2273 Tel. [phone]