N.M. Admin. Code § 19.8.9.914 - DISPOSAL OF EXCESS SPOIL FROM SURFACE MINING ACTIVITIES
A. For surface mining activities, each
application shall contain descriptions, including appropriate maps and cross
section drawings, of the proposed disposal site and design of the spoil
disposal structures according to 19.8.20.2034 through 2037 NMAC. These plans
shall describe the geotechnical investigation, design, construction, operation,
maintenance, and removal, if appropriate, of the site and structures.
B. Each such application shall contain the
results of a geotechnical investigation of the proposed disposal site,
including the following:
(1) the character of
bedrock and any adverse geologic conditions in the disposal area;
(2) a survey identifying all springs, seepage
and ground water flow observed or anticipated during wet periods in the area of
the disposal site;
(3) a survey of
the potential effects of subsidence of the subsurface strata due to past and
future mining operations;
(4) a
technical description of the rock materials to be utilized in the construction
of those disposal structures containing rock chimney cores or underlain by a
rock drainage blanket; and
(5) a
stability analysis including, but not limited to, strength parameters, pore
pressures and long-term seepage conditions. These data shall be accompanied by
a description of all engineering design assumptions and calculations and the
alternatives considered in selecting the specific design specifications and
methods.
C. If, under
Subsection I of
19.8.20.2034 NMAC, rock-toe
buttresses or key-way cuts are required, the application shall include the
following:
(1) the number, location, and
depth of borings or test pits which shall be determined with respect to the
size of the spoil disposal structure and subsurface conditions; and
(2) engineering specifications utilized to
design the rock-toe buttress or key-way cuts which shall be determined in
accordance with Paragraph (5) of Subsection B of
19.8.9.914 NMAC.
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