GENERAL49556

• Permit No: C1980004
• IBM Index Class Name: General Documents
• Doc Date: 1/29/1992
• Doc Name: PROPOSED DECISION AND FINDINGS OF COMPLIANCE FOR PR1 and RN3
• Permit Index Doc Type: FINDINGS
• Media Type: D
• Archive: No

SECTION B
The following findings and specific approvals are required by Rule 4
Hydrologic Balance - Rule 4.05
A. Water Quality Standards and Effluent Limitations
The Division proposes to grant three small area exemptions from
use of sediment ponds due to the limited stze of the areas and
due to the fact that ponds and treatment facilities are not
necessary for the drainage to meet the effluent limitations of
Rule 4.05.2 and applicable State and Federal water quality
standards for receiving streams and also due to the fact that
no mixing of surface drainage with a discharge from underground
workings will occur. The small areas to be exempted are
located at the topsoil pile (SAE2), rip-rap stockpile (SAE3),
and the office complex (SAE1). These areas are discussed in
Appendix M and are located on Map 2.2-3 in the mine permit.
(4.05.2(3)(b)(i)).
Stream Channel Diversions
The Division proposes to approve the diversion of an ephemeral
stream draining less than one square mile (unnamed channel in
McClave Canyon). This decision is based on a finding that the
proposed diversion meets the requirements of 4.05.18 and
4.05.3, applicable local, State, and Federal statutes and
regulations and that the diversion is designed to safeguard
public safety and to minimize adverse impacts to the hydrologic
balance. (4.05.3(1).
Surface and Ground Water Monitoring
The applicant will conduct monitoring of ground water in a
manner approved by the Division. The ground water monitoring
plan is as follows: quarterly monitoring of wells GW-1 and
GW-4 (located on Map 4.2-2 in the mine permit) for static water
level, pH, temperature, and specific conductance; water quality
sampling of mine water discharges as required by NPDES and CDOH
permits; monitoring of all non-seep inflows into the mine to
include source, quantity, duration, and quality (pH, electrical
conductance, and temperature>; monitoring quantities of water
discharged from the mine, consumed in the mine, and imported
for use in the mine. Water samples will be collected with a
bailer after the depth to water table has been measured. All
monitoring wells shall be repumped at least once a year and at
least one day prior to sample collection with an air lift or a
bailer. (4.05.13(1)).
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