PERMFILE40181

• Permit No: M1997089
• IBM Index Class Name: Permit File
• Doc Date: 12/17/1997
• Doc Name: ADEQUACY ISSUES STONE GRAVEL PIT PN M-97-089
• From: DMG
• To: STONE GRAVEL PIT
• Media Type: D
• Archive: No

Adequacy Issues
Stone Gravel Pit
3

December 17, 1997
Permit No. M-97-089
6. Drainage Control Berms -Reclamation Plan indicates that a 3' earthen berm shall be
constructed along the east and north borders of each reclaimed extraction unit, to control
surface drainage and contain sediment. Reclamation Pian suggests that the 3' berms shall
remain as permanent control structures. However, the berms are not shown on the
Reclamation Plan Map.
Please clarify the dimensions (width, height, side slope) of the sediment containment
berms and clarify whether the drainage control berms are permanent or removed during
final reclamation for each extraction unit. If the drainage control berms are to remain as
permanent structures, please indicate their position and orientation on the Reclamation
Plan Map.
Additionally, DMG is concerned that the berms constructed along the north side of each
unit (oriented in E-W direction), will be trending downslope. Downslope orientation for
drainage control berms may concentrate drainage and encourage erosion. Pursuant to
Rules 3.1.5(3) and (10), and 3.1.6, DMG recommends that permanent drainage control
berms be oriented perpendicular to the final slope.
7. Groundwater - Exhibit G of the application, Water Information, indicates that mining
and/or reclamation operations are not expected to directly affect surface or groundwater
systems. Local citizen has submitted statement of concern, addressing potential impact to
their well.
Rule 3.1.6 requires that mining and reclamation operations be conducted in a manner
which minimizes disturbances to the prevailing hydrologic balance of the affected land and
of the surrounding area and to the quantity or quality of water in surface and groundwater
systems. Please demonstrate how applicant will conduct operations to ensure compliance
with Rule 3.1.6.
Groundwater Quantity -Applicant can demonstrate minimal impact to groundwater
quantity by verifying that groundwater will not be exposed by mining operations.
Information on depth to groundwater may be available from well logs from local
drilling operations, or Office of State Engineer, Division of Water Resources. Similar
information may have been recorded during the test pit excavations, conducted by
the applicant previously. Additionally, information may be available from operators
of previous adjacent permitted mining operations.

Groundwater Quality -Information on groundwater quality may be available from
local well logs, Office of State Engineer, or previous operators.
Applicant can minimize potential adverse impact to water quality, Rule 3.1.6, and