GENERAL38956

• Permit No: C1981014
• IBM Index Class Name: General Documents
• Doc Date: 6/27/1984
• Doc Name: PROPOSED DECISION And FINDINGS OF COMPLIANCE
• Permit Index Doc Type: FINDINGS
• Media Type: D
• Archive: No

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Chapter 4.0 of Attachment E of the amended permit application presents a
proposed subsidence monitoring program for the Dorchester No. 1 Mine. The
plan proposed includes the installation of two high-resolution target grids of
survey monuments above panel areas selected to observe various anticipated
ground subsidence conditions. One test grid is positioned above an area of
relatively thin overburden, including areas of previous underground coal
mining. The second test grid is proposed to be installed above an area of
relatively thick overburden with no previous underground coal extraction.
Survey monument construction and location are depicted on figures included
within Attachment E. Monitoring and report frequencies comply with the
regulatory requirements of Rule 2.05.6(6).
In addition, Dorchester Coal Company proposes to monitor the conditions of
County Roads 92 and 115, the Florence City waterline, the electric substations
and transmissions lines. The operator has committed to repair any damages to
the Florence City waterline that are the result of the mining operation. In
the opinion of the Division, however, there remains an inadequacy within the
proposed monitoring plan.
The applicant states their contention that the deed waiver contained within
the Thompson Ranch deed exempts the company from the responsibility of
monitoring the Thompson Ranch structures. Rule 2.05.6(6)(c)(i)(C) requires
the monitoring of the location and orientation of any potentially effected
structure. Therefore, the Division deems it necessary to impose the following
stipulation upon permit approval.
Stipulation No. 10
THE DIVISION DIRECTS DORCHESTER COAL COMPANY TO MONITOR THE LOCATION AND
ORIENTATION OF THE THOMPSON RANCH STRUCTURES. THE APPLICANT SHALL
SURVEY THESE STRUCTURES ON A QUARTERLY BASIS.
In order to facilitate the semi-annual subsidence monitoring report, required
by Rule 2.05.6(6)(c)(i)(E), the Division deems it appropriate to impose the
following stipulation upon permanent permit approval.
Stipulation No. 11
THE DIVISION DIRECTS DORCHESTER COAL COMPANY TO SUBMIT A PROPOSED REPORT
FORMAT FOR THE REQUIRED SEMI-ANNUAL SUBSIDENCE MONITORING REPORT, WITHIN
120 DAYS FOLLOWING PERMIT APPROVAL. THIS REPORT FORMAT SHALL INCLUDE
TABULATED SURVEY MONUMENT AND STRUCTURE LOCATION AND ORIENTATION DATA.
SURVEY DATA FOR THE TWO HIGH-RESOLUTION MONUMENT GRIDS SHALL ALSO BE
PRESENTED GRAPHICALLY, IN CROSS-SECTION FORM. THE SUBSIDENCE MONITORING
MAP SHALL BE AMENDED TO INCLUDE MONUMENT IDENTIFICATION LABELING, IN
ORDER TO FACILITATE DATA REPORTING AND ANALYSIS. FINALLY, EACH
SEMI-ANNUAL SUBSIDENCE MONITORING REPORT SHALL INCLUDE A SUMMARY
COMPARISON OF MONITORING RESULTS AND THE APPLICANT'S PREDICTIONS FOR
EACH INVENTORIED STRUCTURE AND THE STREAM CHANNEL OF NEWLIN CREEK.
With the imposition of these stipulations, the amended permit application for
the Dorchester No. 1 Mine is found to be in compliance with the requirements
of Rules 2.05.6(6) and 4.20 of the permanent program regulations.