INSPEC33457

• Permit No: M1980244
• IBM Index Class Name: Inspection
• Doc Name: MINERALS PROGRAM INSPECTION REPORT
• Inspection Date: 10/21/1994
• Media Type: D
• Archive: No

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NINE ID ~ OR PROSPECTING ID f M-80-244
INSPECTION DATE 10-21-94 INSPECTOR'S INITIALS ACS
OBSERVATIONS
A monitoring inspection of the Phase 1 leach pad construction and appurtenant installations
was conducted. The focus of this inspection was clean out of the stormwater sump above the
toe berm (hereafter referred to as the "sump^ for purposes of this report) in preparation for
composite liner installation.
Upon arrival at the site it was observed that a backhoe had been used to clean the bulk of
the saturated silts and clays from the sump. The material that had been dredged was trucked
from the leach pad and dumped below the toe berm in the area of the Carlton tails. A smooth
edged fitting had been bolted to the bucket to cover the teeth and segments in an effort to
minimize damage to the VLDPE liner at the bottom of the sump. A materials cross-section in
the sump from top to bottom ie: 1) saturated fine grained soils, 2) approximately two feet
of compacted soil liner fill, 3) geomembrane, 4) geotextile, 5) 1 foot of select structural
fill, 6) underdrain fill. A perforated riser pipe had been installed through the entire
cross-section and had been fitted on to the horizontal 24" perforated underdrain pipe. The
critical aspects of the sump clean out are that saturated or otherwise unacceptable fill ie
removed and replaced with the appropriate material, and that any damaged geotextile or
geomembrane ie adequately repaired or replaced.
The bolt on edge on the backhoe had fallen off at some point, and the backhoe had ripped the
geomembrane in at least two locations near the riser pipe. Once the backhoe had gone ae deep
ae it could without further damaging the VLDPE, a bob-cat and hand shoveling were employed
to clean down to the underdrain VLDPE cover. Once a 15' x 15' area was cleaned off, the
geomembrane and geotextile were cut away to exposed the select structural fill. There was
a small amount of mud on the select fill surface in the immediate vicinity of the riser pipe,
and a veneer of mud on the select fill where the VLDPE had been ripped by the backhoe,
otherwise, the surface of the select structural fill was markedly dry. A small backhoe was
brought in the dig out around the riser pipe. This stage in the project was reached at
approximately 2:30 p.m. I left the site at this point, and Jim Pendleton arrived to observe
the removal of the riser pipe at approximately 3:15 p.m. Dr. Pendleton's observations will
be the subject of a separate report.
Also inspected on this date was the temporary topsoil stockpile below the primary crusher
pad. The catchment road and berme above the topsoil pile had been adequately maintained to
prevent contamination of the topsoil from sloughing off the crusher pad fill. The contractor
was stripping topsoil with a small dozer in advance of future fill placement to the east.
A water sample was obtained from the outfall of the 24" perforated underdrain pipe. The
sample was collected at 14:20, and was preserved to pH 12 with NaOH to facilitate analysis
for total and W.A.D. cyanide. The sample was put on ice at approximately 14:40 in Cripple
Creek, and was maintained on ice or in a secure refrigerator until it was delivered to Core
Labe at 15:10 on 10-25-94. The operator will be provided the analysis results when they are
available.
cc: Berhan Keffelew
Carl Mount
Jim Pendleton
I & E Contact Address
NAME John Hardaway
OPERATOR Cripple Creek & Victor Gold Co.
STREET P.O. Box 191
CITY/STATE/ZIP Victor, CO 80860
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