PERMFILE46723

• Permit No: M1988112
• IBM Index Class Name: Permit File
• Doc Date: 11/8/1988
• Section_Exhibit Name: APPENDIX Q ADEQUACY REVIEW QUESTIONS AND RESPONSES
• Media Type: D
• Archive: No

use of a compacted soil Liner, if one is employed it must achieve a
permeability of 1x70-6 cm/sec. It will be necessary to submit
documentation that this permeability has been achieved prior to
placement of the upper liner.
Response: The target permeability is the permeability that will be achieved
during liner construction.
BMR intends to implement a comprehensive Quality Assurance/
1 Quality Control (QA/QC) program to monitor the quality of the
materials employed in the soil liner and ensure their proper
placement. As part of this program, BMR will submit tube samples
of the soil liner to a qualified soils laboratory to provide
confirmation permeability test results. However, at best, the
test results will be available in 3 to 4 days and may take as
' long as a week. BMR does not intend to leave the soil liner
uncovered during this time period due to the potential damage due
to traffic and/or drying. Proper protection of the sail liner
will require that it be covered with at least the secondary
' recovery layer (SRL) within a day of placement.
Exhibit D, Section D.7.4 revised to delete "target" 2/15/89.
30. The primary 60-mil HDPf )finer extending to the heap and pond perimeter
berms, illustrated on Figure C-8 and further detailed in Figures C-9
and C-10, should be anchored such that the liner extends along the
1 interior surface of a "U" shaped ditch, thus providing additional
anchoring security. Please address.
`'~ Response: The anchor trench details shown on Figures C-11 and C-12
(formerly Figures C-9 and C-10) have been revised to show the
liner extending along the interior surface of the "U" shaped
ditch.
Figures C-11 and C-12 revised 2/15/89.
31. Solutions are to be pumped to .and from the mill in pressure-tested
welded pipe. Although the pipelines are not shown, a facility pipeline
corridor is noted on Exhibit E-10.
a. As this area can potentially come into contact with concentrated
cyanide solution, the pipeline corridor should be lined with
HDPE. A design should be submitted including the details at the
haul road crossing and mill building entrance location.
Response: The pipeline corridor will be lined with HDPE. Details of this
corridor at the haul road crossing are included in Figure D.5-1.
The mill building specifications have not been completed but the
design for the pipeline at the mill building entrance will be
submitted when completed.
Exhibit D, Section D.5 revised and Figure D.5-1 added 2/15/89.
' b. Back-pressure valves are suggested for inclusion as a safety