REP19367

• Permit No: M1988112
• IBM Index Class Name: Report
• Doc Date: 9/29/1993
• Doc Name: MEMO-COMPOSIT E LINAR INSTALLATION BATTLE MOUNTAIN GOLD SAN LUIS PROJECT FN M-88-112
• From: DMG
• To: LARRY OEHLER
• Media Type: D
• Archive: No

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STATE OF COLORADO
DIVISION OF MINERALS AND GEOLOGY
Department o(Natural Resources
1313 Sherman 51., Room 215
Denver, CO 80203
Phone: [phone]
FAX:[phone]
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Roy Rome
September 29, 1993 cnyem^~
Michael B. Lon4'
TO: Larry Oehler Div ision Durc for
FROM: Allen Sorenson
RE: Composite Liner Installation, Battle Mountain Gold, San Luis
Project, File No. M-88-112
The composite liner currently being installed at the San Luis
Project is required to be installed in conformance with the
technical specifications contained in Appendix J of the approved
permit amendment. The operator must furnish the Division with a
construction report that includes results of laboratory and field
testing of earthen and synthetic materials used to construct the
composite liner and the pervious drainage blanket. Such a
construction report was provided to the Division when the tailings
impoundment was first built at San Luis; it included a narrative
description of construction, as well as soil test results, a
summary of destructive test results on synthetic liner seams,
manufacturers quality control certification for the geomembrane,
and product quality reports from resin supplies. A report
following the same general format will be sufficient for the
current liner installation project.
One concern that I have with the QA/QC protocol for liner
installation in the approved permit, is that a minimum frequency
for sampling and testing is not specified. Of less concern is that
ASTM designations are not specified for the required materials
testing. I would recommend that testing be done in accordance with
the following table for all type 3 (soil liner) materials, and that
gradation testing be done for all type 1 (embankment facing), and
type 2 (drainage blanket) materials.
TEST ASTM DESIGNATION MINIMUM F~tEOUENCY
Gradation D422 one per 5010 c.y.
Atterberg Limits D4318 one per 5010 c.y.
Compaction D698 one per 20p0 c.y.
Density D1556 one per 500 c.y.
Moisture Content D2216 & D4959 one per 500 c.y.