C PROJECT NOS. 404-405 OUAL ITV PLAN
Transcript of C PROJECT NOS. 404-405 OUAL ITV PLAN
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REV. NO. DATE OF ISSUE
OUAL ITV PLAN
QUALITY PLAN NO. QP-404-1 PROJECT NOS. 404-405
FOR
REMEDIAL ACTIVITIES
FOR
TAILINGS PILES
FOR
UMETCO MINERALS CORPORATION URAVAN MILL
URAVAN, COLORADO
PREPARED BY CHEN ANO ASSOCIATES, INC.
DENVER, COLORADO
PURPOSE OF ISSUE ISSUE APPROVED BY
0 6/12/87 For Submittal to State 1 2/10/88 For Construction
~!~!• Approval j.¾7& t/ S" ~ -'-
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QUALITY PLAN NO. QP-404-1 PROJECT NOS. 404, 405
INDEX
Page No.
PART I GENERAL
1.0 SCOPE OF QUALITY PLAN. . . . . . . . . . . . . 2.0 LIST OF QUALITY CONTROL PROCEDURES . • . . . . . . . . 3.0
4.0
LIST OF ENVIRONMENTAL CONTROL PROCEDURES . .
COMPLIANCE REPORTS .. . . . . . . . . . . . . . . . .. . .
PART II QUALITY CONTROL/QUALITY ASSURANCE
1.0
2.0
SCOPE OF QUALITY CONTROL/QUALITY ASSURANCE •. . . . . 1.1
1.2
QC/QA Included •••
QC/QA Not Included.
.. . . ..
. . . . . . . . . . . . . . . .
QUALITY CONTROL. . . . . . . 2.1
2.2
Personnel. . . . . . . - . . . . . Dewatering surface Liquids on the Tailings Piles . . 2.2.1
2.2.2
Trenches, Sumps and Drainage systems.
Compliance Report . . . . . . . . 2.3 Placement of Contaminated Materials on
Tailings Piles •.. . . . . . . . 2.3.1 Placement. . . . . . . . . . . . . . . . . . 2.3.2 Quality Control Procedures •.
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QUALITY PLAN NO. QP-404-l PROJECT NOS. 404, 405
2.3.3 Frequency of Quality control Tests. • • • • • 9
2.3.4 compliance Report .•.•..... . . . 2.4 Riprap cover for Rockfill Buttress . . . . . . .
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2.5
2.4.1
2.4.2
Placement of Riprap ...•
Quality Control Procedures ..
. . .
. . . 2.4.3 Frequency of Quality Control Observations .. 11
2.4.4 Compliance Report ...
Reclamation Cover for Existing 3:1 Slopes.
2.5.1
2.5.2
2.5.3
2.5.4
Placement . . .
Quality Control Procedures.
Frequency of Quality Control Tests ..
Compliance Report •..•..•
. . . .
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2.6 Reclamation Cover for S(H):l(V) Slopes and Top. 16
2.7
2.8
2.9
2.6.l Placement of Reclamation Cover.
2.6.2 Quality Control Procedures ..••
2.6.3 Frequency of Quality Control Testing •.
2.6.4 compliance Report ...•..
Surface Runoff control Facilities.
2.1.1
2.7.2
2.7.3
Channels and Ditches •••.
Quality Control for Drainage ••
Compliance Report
Monitoring Devices. . . . . .
2.8.1 Installation. . . . 2.8.2 compliance Report.
Submission of Documents ••.
. . .
. . . . . . . . . . .
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QUALITY PLAN NO. QP-404-1 PROJECT NOS. 404, 405
2.10 Documentation of Quality control .
3.0 QUALITY ASSURANCE.
. . . . . . . . .
. . . . 3.1 Personnel ... . . . . . . . . . . . . . . .
3.2 QA Activities •. . . 3.3 Documentation •. . . . . . . . . . . . . . .
PART III MONITORING
1.0
2.0
3.0
SCOPE OF MONITORING.
TAILINGS PILES •.
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. .
. . .
2.1 Piezometers •• . . . . .. . . . . . . . . . . . . 2.2
2.3
2.4
2.5
. . . . . . . . .. . surface Movement Monuments .
Erosion Monuments .. • •• . . . . . .
Visual Inspection and Aerial Photography. . . . . . Environmental Control Procedures . . . . . . . .
SURFACE RUNOFF CONTROL FACILITIES .... . . . . .
PART IV PERFORMANCE EVALUATION
1.0 SCOPE OF PERFORMANCE EVALUATION . . . . • . . . . • •
2.0 PIEZOMETERS . . . . . . . . . . . . . . . . . . . 3.0 SURFACE MOVEMENT MONUMENTS. . . . . . . . . . . . • . . •
4.0 EROSION MONUMENTS . . . . . . . . . . . . . . ,. . • . . •
5.0 VISUAL INSPECTION AND AERIAL PHOTOGRAPHY. . • . . • . 6.0 PERFORMANCE OF RECLAMATION COVER. . . . . . . . . • .
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PART I GENERAL
1.0 SCOPE OF QUALITY PLAN
QUALITY PLAN NO. QP-404-1 PROJECT NOS. 404, 405 PART I
Page 1
The Quality Plan presented herein covers the Remedial Activi
ties as set forth in Section 4.4 Tailings Piles of the Uravan Reme
dial Action Plan (RAP) , and as described in the Final Plans and
specifications for Remedial Activities for Tailings Piles (Spec
ification No. S-404-1), hereinafter referred to as the Specifica
tions.
The Quality Plan meets the requirements set forth in the RAP in
section 4.4.5 Quality Control/Quality Assurance, Monitoring Per
formance Evaluation and Inspection, and in Section A4.4 Tailings
Piles in Addendum A.
The Quality Plan consists of the following:
(1) Quality control/Quality Assurance (QC/QA).
{2) Monitoring.
{3) Performance Evaluation.
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2.0 LIST OF QUALITY CONTROL PROCEDURES
The following Quality Control Procedures are made a part of the
Quality Plan by reference and will be submitted separately in a
document titled Quality Plan for Remedial Activities - Quality Con
trol Procedures, Quality Plan No. QP-QCP-1.
Procedure No.
QC-1
QC-2
QC-3
QC-4
QC-5
QC-7
QC-8
QC-9
QC-10
QC-11
QC-13
QC-14
QC-15
Q~-26
QC-27
QC-28
Procedure
In-Place Density Tests
Laboratory Standard Compaction Test
Determining the Specific Gravity of Soils
Soil Classification for Engineering Purposes
Soils Finer than No. 200 Sieve
Moisture content of Soils
Riprap Size Distribution
sampling of Aggregates and soils
Observation of Excavation v
Observation of Fill Placement ~
Monitoring of Erosion Monuments
Monitoring· of Piezometers
Monitoring of surface Movement Monuments
Determining Clay and Random Fill Thickness for Liners and Reclamation covers
Preparation of Riprap Reference stockpiles
Determining Riprap Thickness for Reclamation Covers and Channels
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3.0 LIST OF ENVIRONMENTAL CONTROL PROCEDURES
The following Environmental Control Procedures which will be
submitted separately are made a part of this Quality Plan by refer
ence.
Environmental control
Procedure No. E-2.l
E-3.4
E-3.6
E-4.5
Title Tailings Seepage Control
Ditch Diversion Inspection
Rim Erosion Monitoring
Tailings Stability Monitoring
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QUALITY PLAN NO. QP-404-1 PROJECT NOS. 404, 405 PART I
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4.0 COMPLIANCE REPORTS
Compliance Reports shall be prepared by the Quality control
Officer for written approval by the Site Manager and the on-Site
Coordinator (OSC) where noted in the following sections. Compliance
Reports shall be prepared for the following:
Report No. CR-404-1
CR-404-2
CR-404-3
CR-404-4
CR-404-5
CR-404-6
CR-404-7
Work Items
Dewatering surface Liquids on Tailings Piles
Placement of Contaminated Materials on Tailings Piles
Riprap Cover for Rockfill Buttress
Reclamation Cover for Existing 3H:1V Slopes of Tailings Piles
Reclamation Cover for 5H:lV Slopes and Top of Tailings Piles
Surface Runoff Control Facilities
Monitoring Devices
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PART II QUALITY CONTROL/QUALITY ASSURANCE
QUALITY PLAN NO. QP-404-1 PROJECT NOS. 404, 405 PART II
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1.0 SCOPE OF QUALITY CONTROL/QUALITY ASSURANCE
1.1 OC/OA Included
QC/QA shall be provided for the following:
(1) construction of trenches and sumps for dewatering surface liq
uids by excavation of the existing tailings for dewatering.
(2) Placement and compaction of contaminated materials on top of
the Tailings Piles.
(3) Placement of riprap on the rockfill buttress on the Tailings
Piles.
(4) Placement of the reclamation cover on the Tailings Piles.
(5) Construction of the drainage ditches and channels .
(6) Installation of monitoring devices .
(7) Submission of Documents and Reports.
1.2 QC/QA Not Included
QC/QA for the following is included in Part III Monitoring.
(1) Monitoring including visual surveillance.
2.0 QUALITY CONTROL
2.1 Personnel
QUALITY PLAN NO. QP-404-1 PROJECT NOS. 404, 405 PART II
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The Quality Control Officer or his designated representative,
hereinafter referred to as the QC Officer, shall verify that the
Work is performed in accordance with the specifications as approved
by the State. The key items for Quality Control are listed in the
following sections. Approval of the construction covered in each of
the following sections shall be documented in writing by the QC
Officer in accordance with the Quality Control Procedures listed in
this Quality Plan.
2.2 Dewatering surface Liguids on the Tailings Piles
2.2.1 Trenches, Sumps and Drainage systems
The QC Officer shall verify the following:
(1) Grades are maintained to direct surface water to the back of
the Tailings Piles to a point of collection.
(2) Temporary trenches are excavated and sumps are constructed to
provide surface drainage, reduce ponding and facilitate the
removal of surface water.
(3) Collected surface water from the top of the Tailings Piles is
pumped to the New Evaporation Ponds or the lined Existing Club
Ranch Ponds if ready.
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QUALITY PLAN NO. QP-404-1 PROJECT NOS. 404, 405 PART II
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Quality control Procedure QC-10 Observation of Excavation shall
be used.
2.2.2 Compliance Report
A compliance Report shall be prepared for dewatering surface
liquids on the Tailings Piles.
2.3 Placement of contaminated Materials on Tailings Piles
2.3.l Placement
The QC Officer shall verify the following:
(1) Only materials designated for placement on the Tailings Piles
are placed on the Tailings Piles.
(2) Size of scrap placed on Tailings Piles 1 and 2 has a maximum
dimension of 10 feet and a maximum volume of 30 cubic feet.
(3) Scrap having a hollow volume greater than 5 cubic feet is re
quired in volume by at least 70 percent prior to placement on
Tailings Piles 1 and 2.
(4) Scrap is spread across the Designated Disposal Areas to avoid
nesting and to reduce the volume of voids.
(5) Tailings, neutralized sludge, and/or soils are placed over and
into the scrap in sufficient amount to fill the voids between
the large pieces and the volume within the hollow pieces
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QUALITY PLAN NO. QP-404-1 PROJECT NOS. 404, 405 PART II
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recognizing that some voids will remain as provided for in the
Specifications.
(6) The first layer of tailings, neutralized sludge and/or soils
does not exceed S feet in thickness. Subsequent layers do not
exceed 2 feet except for isolated scrap protrusions.
(7) The upper 2 feet of the first layer, and the subsequent layers
of tailings, neutralized sludge and/or soils are compacted to
at least 90 percent of standard Proctor maximum density.
(8) The contaminated materials are placed to contain drainage on
top of the Tailings Piles at all times and where possible, the
working surface is sloped toward the back of the Tailings Piles
at a minimum slope of 2%.
(9) The contaminated materials are placed to achieve the final
Tailings Piles configuration with S(H):l(V} slopes and the tops
of the Tailings Piles are sloped at 3 percent towards the back
of the Tailings Piles.
2.3.2 Quality control Procedures
The QC Officer shall use the following Quality Control Proce
dures. for Quality Control of the placement of contaminated materi
als.
Procedure
In-Place Density Tests
Laboratory Standard compaction Test
Determining the Specific Gravity of Soils
Procedure No.
QC-1
QC-2
QC-3
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Moisture Content of Soils
Observation of Fill Placement
2.J.3 Frequency of Quality control Tests
QUALITY PLAN NO. QP-404-1 PROJECT NOS. 404, 405 PART II
QC-7
QC-11.
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The frequency of the Quality Control Tests shall be as follows:
(1) The frequency of the field density and moisture tests shall be
not less than one for each 1,000 cubic yards of soils, tailings
or neutralized sludge placed.
(2) There shall be at least one field density and moisture test for
each layer of material placed.
(3) Frequency of laboratory standard compaction tests shall be such
that the maximum densities are determined for the range of
materials being placed on the Tailings Piles. In addition, the
frequency of laboratory compaction tests shall be not less than
one test for each 10,000 cubic yards of materials placed on the
Tailings Piles.
2.3.4 Compliance Report
A Compliance Report shall be prepared for the placement of
contaminated materials on top of the Tailings Piles.
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2.4 Riprap Cover for Rockfill Buttress
2.4.1 Placement of Riprap
QUALITY PLAN NO. QP-404-1 PROJECT NOS. 404, 405 PART II
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The QC Officer shall verify the following :
(1) The riprap from the Burbank Quarry placed meets the require
ments of Type c Riprap having a maximum size of 48 inches, a
0 50 size of 24 to 36 inches, and a 0 15 size of 3 to 18 inches.
(2) Riprap cover conforms to the lines and grades shown on Drawing
Nos. P-404-3 and P-404-4 of the Specifications.
(3) The riprap is hauled and placed in a single lift thickness in
such a manner to minimize segregation.
(4) The riprap areas receive at least two passes of a D-7 dozer or
equivalent in order to key the rock for stability.
(5) Temporary access roads on the rockfill buttress are regraded,
compacted and covered with the required thickness of Type c
Riprap to conform to the riprap cover in place.
2.4.2 Quality Control Procedures
The QC Officer shall use the following Quality Control Proce
dures for Quality Control for placement of riprap on the rockfill
buttress.
Procedure
Riprap Size Distribution
Observation of Fill Placement
Procedure No.
QC-8
QC-11
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Preparation of Riprap Reference Stockpiles
Determining Riprap Thickness for Reclamation Covers and Channels
QC-27
QC-28
2.4.3 Frequency of Quality control Observations
The frequency of Quality Control Observations shall be as fol
lows:
(1) Each load of riprap shall be visually examined by the loader
operator before leaving the Burbank Quarry. The examination
shall be performed by comparing the rock size distribution in
each truckload against a calibrated reference stockpile in
accordance with Quality control Procedure QC-8.
(2) Periodic site inspections shall be made for the riprap place-
ment on the rockfill buttress. Areas of riprap which show an
accumulation of riprap sizes less than the minimum 050 size
shall be removed and blended with subsequent truckloads until
the materials visually conform with the specified gradation.
2.4.2 Compliance Report
A Compliance Report shall be prepared for the placement of
riprap on the Tailings Piles rockfill buttress.
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QUALITY PLAN NO. QP-404-1 PROJECT NOS. 404, 405 PART II
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Reclamation cover for Existing 3(H):l(V) Slopes
QC/QA shall be provided for the major items of construction of
the Reclamation Cover on the existing J(H) : l(V) Tailings Piles
slopes. The final cover shall be constructed in accordance with the
Specification including Drawing No. P-404-3.
2.5 . 1 Placement
The QC Officer shall verify the following:
(1) The existing layer of random fill is regraded to a uniform
thickness as practicable and that adjustments in subsequent
random fill thicknesses are made to ensure that the total
thickness of random fill is 1.5 meters or as otherwise speci
fied.
(2) The existing layer of random fill is compacted to at least 95%
of the standard Proctor maximum density in the areas where the
dry density is less than this specification.
(3) Clayey soil material having at least 40 percent material pass
ing the No. 200 sieve, a maximum size of 12 inches, a liquid
1imit of at least 20 percent, and a plasticity index of at
least 10 percent is removed from an approved borrow source and
placed as a clayey cover over the existing random fill.
(4) The clayey soil is placed in horizontal compacted lifts of
1-foot or less in thickness and compacted to at least 95% of
standard Proctor maximum density.
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(5) The compacted thickness of the clayey soil layer is at least
o.9 meters or as otherwise specified.
(6) Random Fill is inorganic soils having a maximum size of 12
inches and is obtained from an approved Borrow source and
placed in a cover layer over the clayey soil.
(7) The Random Fill is placed in horizontal compacted lifts not
exceeding 1-foot in thickness and compacted to at least 95
percent of the standard Proctor maximum density.
(8) The thickness of the existing and newly placed random fill
totals at least 1.5 meters or as otherwise specified.
(9) Riprap excavated from the Burbank Quarry or other approved
Borrow source having a maximum size of 24 inches, a 0 50 size of
12 to 18 inches, and a D15 size of 3/4 inch to 3 inches
(Type B), is placed over the Random Fill.
(10) The Riprap is placed in a single lift in such a manner as to
minimize segregation, and receives at least two passes of a D-7
Dozer or equivalent in order to key the rock for stability.
(11) Accumulation of riprap sizes less than the minimum 050 size is
removed and blended with subsequently delivered loads to meet
the desired gradation.
(12) The riprap layer is at least 0.6 meter thick.
2.5.2 Quality control Procedures
The QC Officer shall use the following Quality Control Proce
dures for Quality Control of the placement of the reclamation cover
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QUALITY PLAN NO . QP-404-1 PROJECT NOS. 404, 405 PART II
on the Tailings Piles .
Procedure
In-Place Density Tests
Laboratory Standard Compaction Test
Determining the Specific Gravity of Soils
Soil Classification for Engineering Purposes
Soils Finer than No. 200 Sieve
Moisture Content of Soils
Riprap size Distribution
Sampling of Aggregates and Soils
Observation of Fill Placement
Determining Clay and Random Fill Thickness for Liners and Reclamation Covers
Preparation of Riprap Reference stockpiles
Determining Riprap Thickness for Reclamation covers and Channels
2.5.3 Frequency of Quality Control Tests
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Procedure No.
QC-1
QC-2
QC-3
QC-4
QC-5
QC-7
QC-8
QC-9
QC-11
QC-26
QC-27
QC-28
The frequency of Quality control tests and observations shall
be as follows:
(1) The frequency of the field density and moisture tests shall be
not less than one test for each 500 cubic yards of placed fill
material (random fill or clayey cover}.
(2) There shall be at least one field density and moisture test for
each lift of fill material placed .
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QUALITY PLAN NO. QP-404-1 PROJECT NOS. 404, 405 PART II
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(3) Gradations and Atterberg limits of compacted fill materials
shall be performed at a frequency of not less than each 1,000
cubic yards of placed clayey cover or each 5,000 cubic yards of
compacted earthfill.
(4} For fill materials where moisture content tests are correlated
with optimum moisture content as determined by the standard
Proctor compaction tests (ASTM D-698), frequency of moisture
content tests of compacted fill material shall not be less than
one test for each 500 cubic yards of compacted fill material.
(5) For fill materials where field density test of compacted fill
materials are correlated with laboratory maximum density as
determined by the standard Proctor compaction test {ASTM
D-698), frequency of field density testing for compacted fill
material shall not be less than one test for each 500 cubic
yards of compacted fill material.
(6) Frequency of laboratory standard Proctor compaction tests shall
be such that maximum densities are determined for the range of
materials being placed in the fill; however, frequency of com
paction tests shall not be less than one test for each 5,000
cubic yards of compacted fill material.
(7) Each load of riprap shall be visually examined by the loader
operator before leaving the Burbank Quarry. The examination
shall be performed by comparing the rock size distribution in
each truckload against a calibrated reference stockpiled in
accordance with Quality Control Procedure QC-8.
{8) Periodic site inspections shall be made for the riprap place-
0 QUALITY PLAN NO. QP-404-1 PROJECT NOS. 404, 405 PART II
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ment on the random fill. Areas of riprap which show an accumu-
lation of riprap sizes less than the minimum 0 50 size shall be
removed and blended with subsequent truckloads until the mate
rials visually conform with the specified gradation.
2.5.4 Compliance Report
A compliance Report shall be prepared for the placement of the
reclamation cover on the existing 3(H) :l{V) slopes of the Tailings
Piles .
2.6 Reclamation Cover for S{Hl:l{Vl Slopes and Top
2.6.l Placement of Reclamation cover
The QC Officer shall verify the following:
(1) The reclamation cover is constructed in accordance with the
Specifications including Drawing Nos. P-404-3 and P-404-4.
(2) During placement of the contaminated materials, an interim
cover of random fill is placed to protect the contaminated
material from runoff on the S(H):l(V) slopes. No more than 5
vertical feet of contaminated material is exposed along the
Tailings Piles crests at any one time.
(3) The interim cover consists of inorganic soils with a maximum
particle size of 12 inches and is placed in a 1-foot compacted
lift and compacted by at least two passes of a D-7 Dozer or
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QUALITY PLAN NO. QP-404-1 PROJECT NOS. 404, 405 PART II
Page 17
equivalent; if the interim cover is to be considered part of
the final cover, the soil shall be compacted in accordance with
the Random Fill Requirements to at least 95 percent of standard
Proctor maximum density, and Quality Control testing shall be
conducted on the same scheduled frequency as for the random
fill. The thickness of the random fill to be subsequently
placed shall be reduced by a thickness equal to the thickness
of the interim fill compacted in accordance with Random Fill
requirements outlined above.
(4) The clayey soil layer is placed over the interim cover or con
taminated material on the 5(H):l(V) slopes and over the contam
inated materials on top of the Tailings Piles. The clayey soil
shall have at least 40 percent material passing the No. 200
sieve, a maximum size of 12 inches, a liquid limit of at least
20 percent, and a plasticity index of at least 10 percent and
shall be removed from an approved Borrow Source .
(5) The clayey soil is placed in horizontal compacted lifts not to
exceed 1-foot in thickness, and compacted to at least 95 per
cent of standard Proctor maximum density.
(6) The clayey cover is a minimum of 0.9 meter thick or as other
wise specified.
(7) Random Fill is inorganic soils having a maximum size of 12
inches and is remoyed from an approved Borrow source and placed
in a cover layer over the clayey soil.
(8) The Random Fill is placed in horizontal compacted lifts not
exceeding 1-foot in thickness and compacted to at least 95
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QUALITY PLAN NO. QP-404-1 PROJECT NOS. 404, 405 PART II
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percent of the standard Proctor maximum density.
(9) The total Random Fill layer including the interim cover is at
least 1.8 meters thick or as otherwise specified.
(10) Riprap excavated from the Burbank Quarry or other approved
Borrow Source having a maximum size of 12 inches, a 0 50 size of
3 to 6 inches, and a 0 15 size of 3/4 inch to No. 8 sieve size
(Type A) is placed over the Random Fill.
(11) The Riprap is placed in a single lift in such a manner as to
minimize segregation, and receives at least two passes of a D-7
Dozer or equivalent in order to key the rock for stability.
(12} Accumulation of riprap sizes less than the minimum 0 50 size is
removed and blended with subsequently delivered loads to meet
the desired gradation.
(13) The riprap layer is at least 0.3 meter thick.
2.6.2 Quality Control Procedures
The QC Officer shall use the following Quality Control Proce
dures for Quality Control of the placement of the reclamation cover
on the Tailings Piles.
Procedure
In-Place Density Tests
Laboratory Standard Compaction Test
Determining the Specific Gravity of
Soil Classification for Engineering
Soils Finer than No. 200 Sieve
Soils
Purposes
Procedure No.
QC-1
QC-2
QC-3
QC-4
QC-5
QUALITY PLAN NO. QP-404-1 PROJECT NOS. 404, 405 PART II
Moisture Content of Soils
Riprap size Distribution
Sampling of Aggregates and Soils
Observation of Fill Placement
Determining Clay and Random Fill Thickness for Liners and Reclamation Covers
Preparation of Riprap Reference Stockpiles
Determining Riprap Thickness for Reclamation Covers and Channels
2.6.3 Frequency of Quality control Tests
QC-7
QC-8
QC-9
QC-11
QC-26
QC-27
QC-28
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The frequency of Quality Control Tests and Observations shall
Q be as follows:
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(1) The frequency of the field density and moisture tests shall be
not less than one test for each 500 cubic yards of placed fill
material (earthfill or Clayey Cover).
(2) There shall be at least one field density and moisture test for
each lift of fill material placed.
(3) Gradations and Atterberg limits of compacted fill materials
shall be performed at a frequency of not less than each 1,000
cubic yards of placed Clayey Cover or each s,ooo cubic yards of
compacted earthfill .
(4) For fill materials where moisture content tests are correlated
with optimum moisture content as determined by the standard
Proctor compaction tests (ASTM D-698), frequency of moisture
content tests of compacted fill material shall not be less than
one test for each 500 cubic yards of compacted fill material.
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QUALITY PLAN NO. QP-404-1 PROJECT NOS . 404, 405 PART II
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(5) For fill materials where field density test of compacted fill
materials are correlated with laboratory maximum density as
determined by the standard Proctor compaction test (ASTM
0-698), frequency of field density testing for compacted fill
material shall not be less than one test for each 500 cubic
yards of compacted fill material.
(6) Frequency of laboratory standard Proctor compaction tests shall
be such that maximum densities are determined for the range of
materials being placed in the fill; however, frequency of com
paction tests shall not be less than one test for each 5,000
cubic yards of compacted fill material.
(7) Each load of riprap shall be visually examined by the loader
operator before leaving the Burbank Quarry. The examination
shall be performed by comparing the rock size distribution in
each truckload against a calibrated reference stockpiled in
accordance with Quality Control Procedure QC-a.
(8) Periodic site inspections shall be made for the riprap place
ment on the random fill. Areas of riprap which show an accumu
lation of riprap sizes less than the minimum 050 size shall be
removed and blended with subsequent truckloads until the mate
rials visually conform with the specified gradation.
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2.6.4 compliance Report
QUALITY PLAN NO. QP-404-1 PROJECT NOS. 404, 405 PART II
Page 21
A compliance Report shall be prepared for the placement of the
Reclamation cover on the 5(H):l(V) slopes and tops of the Tailings
Piles including the interim cover .
2.7 surface Runoff Control Facilities
2.7.1 Channels and Ditches
Drainage control shall be provided during placement of contami
nated materials on top of the Tailings Piles and construction of the
reclamation cover over the tailings and contaminated materials. The
QC Officer shall verify the following:
(1) The rockfill buttress and existing Tailings Pile cover is main
tained and regraded as necessary.
(2) The interim cover over contaminated materials is placed as
described in Part II section 2.6.
(3) Drainage on top of the contaminated materials on top of the
Tailings Piles is maintained by providing a minimum 2 percent
slope towards the sumps at the back of the Tailings Piles.
(4) Following precipitation events, the specified freeboard is
established by continuously pumping utilizing the existing pump
system following the storm event. Freeboard shall be measured
from the water elevation to the crest of the Tailings Piles.
The water shall be drawn down as practicable so that all waters
QUALITY PLAN NO. QP-404-1 PROJECT NOS. 404, 405 PART II
Page 22
are within the sump area within 30 days after storm events.
(5) collection Ditches 7, 8 and 9 and Channels A and Bare con
structed at the locations and to the lines and grades shown on
Drawing Nos. P-404-1 through P-404-6.
(6) Ditches 7, 8 and 9 are lined with riprap where excavated or
constructed in soils in accordance with the Specifications.
2.7.2 Quality control for Drainage
The QC Officer shall ensure drainage measures are implemented
through periodic inspections of the construction and drainage facil
ities.
Procedure
Riprap Size Distribution
Observations of Excavation
Observation of Fill Placement
Determining Riprap Thickness for Reclamation covers and Channels
2.7.3 Compliance Report
Procedure No.
QC-8
QC-10
QC-11
QC-28
A_ Compliance Report shall be prepared for the construction of
channels and ditches.
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2.8 Monitoring Devices
2.8.1 Installation
QUALITY PLAN NO. QP-404-1 PROJECT NOS. 404, 405 PART II
Page 23
Monitoring devices shall be installed in and adjacent to the
Tailings Piles to monitor the performance of the Tailings Piles
during and after construction. The QC Officer shall verify the
following:
(l) The existing piezometers are maintained as shown on Drawing No.
P-404-7.
(2) New piezometers and/or extension of existing piezometers are
installed as shown on Drawing No. P-404-7 at the locations
shown on Drawing Nos. P-404-1 and P-404-2.
(3) surface movement monuments are installed as shown on Drawing
No. P-404-7 at the locations shown on Drawing Nos. P-404-1 and
P-404-2.
(4) Erosion monuments are installed as shown on Drawing No.
P-404-7, at locations shown on Drawing Nos. P-404-1 and
P-404-2.
The QC Officer shall ensure that monitoring devices are in
stalled in accordance with the Specifications through periodic in
spection of the construction.
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2.8.2 Compliance Report
QUALITY PLAN NO. QP-404-l PROJECT NOS. 404, 405 PART II
Page 24
A compliance Report shall be prepared for the installation of
Monitoring Devices.
2.9 submission of Documents
The following documents are to be submitted to the State during
various phases of the Work.
Final Plans and Specifications
Quality Plan
Final Construction Report
certification Report.
Quality Control for the submission of documents consists of the
following:
(1) Action Plan listing tasks, assignments and completion dates.
(2) Preparation of outlines of the documents for review.
(3) Review of completed documents by Consultants and Umetco Person
nel.
2.10 Documentation of Quality control
Written records shall be maintained for each construction day
covering the subject remedial activities. The written records and
QUALITY PLAN NO. QP-404-1 PROJECT NOS. 404, 405 PART II
Page 25
reports shall be in accordance with the respective QC Procedures and
shall include results of all tests conducted. The originals of all
documents shall be maintained in the Uravan Project Files.
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3.0 QUALITY ASSURANCE
3.l Personnel
QUALITY PLAN NO. QP-404-1 PROJECT NOS. 404, 405 PART II
Page 26
Quality Assurance which consists of audits and cross checks on
the Quality control functions, shall be provided by the Quality
Assurance Officer or his designated representative (hereinafter
referred to as the QA Officer).
3.2 OA Activities
The QA Officer shall implement the program by performing the
following functions:
(l) Prequalify QC Personnel
(2) Verification of effectiveness of QC Personnel
(3) Verification of test procedures and results by spot retest
(4) Equipment checks
(5) Review of calculations and documentation.
3.3 Documentation
Each QA Activity shall be documented in writing and shall be
kept in the Uravan Project Files.
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QUALITY PLAN NO. QP-404-1 PROJECT NOS. 404, 405 PART III
Page 27
PART III MONITORING
1.0 SCOPE OF MONITORING
The monitoring program for the Club Mesa Tailings Piles is
designed to provide information on the phreatic levels in the pile,
to ascertain settlement rates and amounts, provide data on stability
and erosion of the protective cover, and to determine the rate and
impact of cliff retreat.
Monitoring of the Tailings Piles shall include:
(1) surface liquids dewatering, quantities and quality
(2) Piezometer levels .
(3) Toe drain effluent rates, quantities and quality.
(4) Siltation in runoff collection channels.
(5) Monitoring of the rockfill buttress, side slope cover, top
cover and drainage diversion channels and ditches.
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2.0 TAILINGS PILES
2.1 Piezometers
QUALITY PLAN NO. QP-404-1 PROJECT NOS. 404, 405 PART III
Page 28
Piezometer locations are shown on 'Drawing Nos. P-404-1 and
P-404-2. Liquid levels in the piezometers will be determined once a
year until the Tailings Piles no longer contain free liquids as
determined by two successive readings.
Quality Control Procedure QC-14, Monitoring Piezometers, shall
be followed.
2.2 surface Movement Monuments
The location of the surface Movement Monuments for Tailings
Piles 1 and 2 are shown on Drawing No. P-404-1, and for Tailings
Pile Jon Drawing No. P-404-2.
Monuments currently in place will continue to be read at least
every six months until the final reclamation cover is placed.
After final remediation, the monuments will be surveyed for
horizontal and vertical movements on an annual basis until the accu
mulated settlement is within 10 percent of total settlement estimat
ed by the monitoring program.
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QUALITY PLAN NO. QP-404-1 PROJECT NOS. 404, 405 PART III
Page 29
Quality Control Procedure QC-15, Monitoring of Surface Movement
Monuments shall be followed.
2.3 Erosion Monuments
The location of the Erosion Monuments are shown on Drawing Nos.
P-404-1 and P-404-2.
These monuments will be surveyed and their location described,
Additionally, the proximity to the cliff edge and other pertinent
observations will be described and recorded. The monuments will be
observed visually and surveyed, if necessary, during the long-term
monitoring program.
Quality Control Procedure QC-13, Monitoring of Erosion Monu
ments, and Environmental Control Procedure E-3.5 Rim Erosion Moni
toring shall be followed.
2.4 Visual Inspection and Aerial Photography
The Surface Movement Monuments and reclamation cover will be
visually inspected on an annual basis after remediation has been
completed. Detailed {large scale) stereoscopic aerial photographs
of the Tailings Piles will also be taken after completion of the
reclamation cover and drainage channels. Additional aerial
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QUALITY PLAN NO. QP-404-1 PROJECT NOS. 404, 405 PART III
Page 30
photographs will be required only if the visual inspection indicates
such a necessity.
2.s Environmental control Procedures
Environmental control Procedures E2.l, Tailings seepage con
trol, and E-4.5, Tailings Stability Monitoring, give additional
details and Quality Control/Quality Assurance for monitoring the
Tailings Piles.
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3.0 SURFACE RUNOFF CONTROL FACILITIES
QUALITY PLAN NO. QP-404-1 PROJECT NOS. 404, 405 PART III
Page 31
In conjunction with observation of the surface monuments and
reclamation cover, the runoff collection and diversion channels will
be observed for evidence of erosion or debris and sediment accumula
tion. These observations will be made at the same time as the moni
toring of the erosion monuments.
Environmental Control Procedure E-3.4 Ditch Diversion
Inspection shall be followed.
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PART IV PERFORMANCE EVALUATION
QUALITY PLAN NO. QP-404-1 PROJECT NOS. 404, 405 PART IV
Page 32
l.O SCOPE OF PERFORMANCE EVALUATION
Performance of the Remedial Activities shall be evaluated to
assure long-term Tailings Pile stability, cover integrity, and the
decline of seepage over time. Monitoring of the following instru-
mentation installed in accordance with the Specifications will be
used as to generate data for the performance evaluation. The tail
ings Piles monitoring systems consist of the following:
(1) Piezometers
(2) surface Movement Monuments
(3) Erosion Monuments
(4) Visual Inspections and Aerial Photography
0 2.0 PIEZOMETERS
QUALITY PLAN NO. QP-404-1 PROJECT NOS. 404, 405 PART IV
Page 33
The piezometers will monitor the change in fluid levels in the
piles at the crest of the rockfill buttress, on the embankment face,
and on the retirement crest.
Data collected from the piezometers will be used to aid in
estimating Tailings Pile settlement (consolidation) and in determin
ing when the toe drain system can be abandoned. Additionally, the
monitoring of the piezometers should be used to determine if the
Remedial Plan is operating as proposed. When all necessary informa
tion has been obtained, the piezometers will be properly plugged
with a bentonite slurry.
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3.0 SURFACE MOVEMENT MONUMENTS
QUALITY PLAN NO. QP-404-1 PROJECT NOS. 404, 405 PART IV
Page 34
The surface Movement Monuments will be used to establish the
post-remediation settlement, erosion, and to determine the amount of
movement of the embankments.
Data collected from the Surface Movement Monuments will be used
to determine the integrity and effectiveness of the reclamation
cover by ascertaining the amount of settlement, erosion, and embank
ment movement.
4.0 EROSION MONUMENTS
QUALITY PLAN NO. QP-404-1 PROJECT NOS. 404, 405 PART IV
Page 35
The Erosion Monuments will be used to determine the amount and
rate of gully erosion and cliff retreat in the Tailings Piles Area.
These monuments will be surveyed and their location described.
Additionally, the proximity to the cliff edge and other pertinent
observations will be described and recorded. The monuments will be
observed visually and surveyed, if necessary, during the long-term
monitoring program. From these observations, the rate of cliff
retreat will be determined and potential impact on the integrity of
the disposal area assessed.
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QUALITY PLAN NO. QP-404-1 PROJECT NOS. 404, 405 PART IV
Page 36
5.0 VISUAL INSPECTION AND AERIAL PHOTOGRAPHY
Visual inspection and aerial photographs shall be used as re
quired to aid the Performance Evaluation.
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6.0 PERFORMANCE OF RECLAMATION COVER
QUALITY PLAN NO. QP-404-1 PROJECT NOS. 404, 405 PART IV
Page 37
All monitoring data shall be evaluated in the context of design
expectations and performance predictions. The periodic evaluation
shall be comprehensive and shall include discussion of the interre
lationship between the monitoring data and the predicted performance
of the Tailings Piles with respect to short and long term pile sta
bility, cover integrity, load/settlement, dewatering and seepage.
Based on a comprehensive assessment, "action" and "concern" levels
shall be specified and discussed in each evaluation. "Concern"
level shall mean that monitoring data is reflecting Tailings Pile
performance which is grossly inconsistent with expectations and may
lead to environmental damage. "Action" level means action must be
taken immediately to mitigate the problem reflected by the monitor
ing·data. contingencies shall be included in this evaluation where
appropriate.
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New Repository Quality Plan Appendix A to Quality Plan QP-404-1
Part I - GENERAL
1.0 Compliance Reports
QUALITY PLAN NO. QP-404-J REPOSITORY CONSTRUCTION
APPENDIX A
Compliance Reports shall be prepared by the Quality Control Officer for written approval by the Site Manager and the ON-Site Coordinator (OSC) where noted in the following sections. Compliance Reports shall be prepared for the following:
Report No.
CR-404-8
CR-404-9
CR-404-10
CR-404-11
CR-404-12
Work Items
Preparatory Work
Placement of Contaminated Materials on the Repository
Reclamation Cover for 5H:1V Slopes and Top of Repository
Repository Surface Run~ff Control Facilities
Rep~sitory Monitoring Devi~es . . . . .
Part II - QUALITY CONTROL/QUALITY ASSURANCE
1.0 Preparatory Work
1.1 Removal of Existing Riprap Cover Materials
Toe QC Officer shall verify the following:
(1)
(2)
(3)
Existing riprap m~terials are radiologically scanned during removal from the rockfill buttresses and Tailings Piles to verify suitability for re-use. Unsuitable materials are placed within the repository.
Existing riprap materials are removed from the rockfill buttresses and Tailings Piles to expose the specified underlying material. Observe and approve proof rolling of exposed rockfill material and visually verify that rockfill material consists of a granular, 12 inch minus material.
Suitable riprap materials are sorted, graded and stockpiled by Type for re-use.
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(4)
1.2
QUALITY PLAN NO. QP-404-1 REPOSITORY CONSTRUCTION
APPENDIX A The compacted random fill and clay fill lining materials are placed on the exposed surface of the rockfill buttresses in accordance with the Specifications and as shown on the Drawings following the Quality Control given in Part II, Section 3.0 of this Quality Plan.
Redundant Toe Drain Installation
The QC Officer shall verify the following:
(1) Drain systems are constructed at the locations and to the construction details shown on Drawing P-404-11 after removal of riprap cover materials from the existing tailings piles.
(2) The drain dimensions are checked for conformance with the Specifications. Documentation of the measurements and surveys shall be reviewed by the QC Officer. Approval of the construction shall be documented in writing by the QC officer.
(3) The compacted random fill and clay fill linings above the drain are installed in accordance with the Specifications by following the Quality Control given in Part II, Section 3.0 of this Quality Plan.
(4) Placement of the drainage material shall be monitored to ensure the following requirements are being met:
a) The correct type of material with the specified gradation is being used.
b) The material being placed is clean and free of unsuitable material.
c) The material is being loaded, transported and placed in a manner which minimizes segregation.
d) The material is being placed to the lines and grades designated in the Specifications and on the Drawings.
e) The pipe is installed with the perforations downward and pipe segments are joined in accordance with the manufacturer's recommendations.
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1.3
(I)
(2)
1.4
1.4.l
(1)
Starter Berm Construction
The QC Officer shall verify the following:
QUALITY PLAN NO. QP-404-1 REPOSITORY CONSTRUCTION
APPENDIX A
The starter berm(s) are constructed at the locations and to the construction details shown on Drawing P-404-11. If modifications to the berm alignments are required by site conditions, such re-alignment shall be approved by the Site Manager or his designated representative, with the agreement of the OSC.
The compacted random fill and clay fill materials are installed in accordance with the Specifications by following the Quality Control reguirements given in Part II, Section 5.0 Earthwork.
Return Water Pond
Preparation of Pond Embankment
The QC Officer shall verify the following:
The new Return Water Pond is constructed at the location and to the construction details shown on Drawing P-404-11. If modifications to the berm alignments are required by site conditions, such re-alignment shall be approved by the Site Manager or his designated representative, with the agreement of the OSC.
(2) The compacted random fill and clay fill materials and the leak detection system are installed in accordance with the Specifications by following the Quality Control given in Part II, Section 5.0 Earthwork and Quality Plan OP-401-1 where relevant to leak detection system installation.
1.4.2 Synthetic Liner Material
The QC Officer shall verify the following:
(1) The synthetic liners are manufactured of new, first quality products designed and manufactured specifically for the purpose of liquid containment. The QC Officer shall visually docwnent that the materials are new.
(2) The liner materials are free of holes, blisters, undispersed raw materials or contamination by foreign matter. Any such defect shall be repaired using the extrudate welding technique in accordance with the manufacturer's recommendations.
(3) Certification from the Liner Manufacturer documenting that the liner meets all physical property specifications for the intended application has been received and approved.
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QUALITY PLAN NO. QP-404-1 REPOSITORY CONSTRUCTION
APPENDIX A 1.4.3 Field Seams
(I)
(2)
(3)
(4)
2.0
(1)
The QC Officer shall verify the following:
The integrity of the field seam is determined in accordance with Quality Control Procedure QC-19.
The location of the seams, the machine used, the operator, weather conditions and any problems are logged on a daily basis.
Vacuum Box Testing - All field seams are inspected for unbonded areas by applying a vacuum to a soaped section of seam. This nondestructive test is performed in accordance with Quality Control Procedure QC-19. Repairs - All defective field seams as detected by both destructive and nondestructive tests are marked and repaired in accordance with manufacturer's recommendations.
Placement of Contaminated Materials on the Repository
The QC Officer shall verify the following:
Only materials designated for placement on the repository are placed on the repository.
(2) Size of scrap placed on the repository has a maximum dimension of 10 feet and a maximum volume of 30 cubic feet.
(3) Scrap having a hollow volume of greater than 5 cubic feet is reduced in volume by at least 70 percent prior to placement on the repository.
(4) Scrap is spread across the repository to avoid nesting and to reduce the volume of voids. No scrap is placed in the first two (2) foot lift or layer of contaminated material.
(5) Tailings, neutralized sludge, soils and/or any other designated waste forms are placed over and into the scrap in sufficient amount to fill the voids between the large pieces and the volume within the hollow pieces, recognizing that some voids will remain as provided for in the Specifications.
(6) The first layer of tailings, neutralized sludge, soil and/or any other designated waste forms does not exceed 2 feet in thickness. Subsequent layers do not exceed 2 feet in thickness except for isolated scrap protrusions.
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(7)
QUALITY PLAN NO. QP-404- J REPOSITORY CONSTRUCTION
APPENDIX A Tailings, neutralized sludge, soils and/or any other designated waste forms are compacted to at least 90 percent of Standard Proctor Maximum Density at a moisture content no greater than optimum.
(8) The contaminated materials are placed to contain drainage on top of the repository at all times and where possible, the working surface is sloped toward the back of the repository at a minimum slope of J percent.
(9) The contaminated materials are placed to achieve the final repository configuration with S(H): I (V) slopes and the top of the repository is sloped toward the crest at 3 percent as shown on Drawing P-404-8.
(I 0) The frequency of the Quality Control Tests shall be in accordance with the Specification for contaminated material placement.
3.0 Reclamation Cover for S(H):l<Y} Slopes and Top
The QC Officer shall verify the following:
(l) The reclamation cover is constructed in accordance with the Specifications including Drawings P-404-8, P-404-9 and P-404-10.
(2)
(3)
(4)
(5)
(6)
The clay soiVradon barrier is placed over the contaminated material on the 5(H):l(V) slopes and over the contaminated materials on top of the repository. The clay soil material shall meet the requirements of Specification P-404-1. Part VII. Section 5.0. Article 5.1 for radon barrier/clay fill be in accordance with the specified and shall be removed from an approved Borrow Source.
The clay soil/radon barrier is placed in horizontal compacted lifts not to exceed 6 inches in thickness and compacted to at least 95 percent of Standard Proctor Maximum Density at a moisture content between optimum and 4 percent over optimum.
The clay soiV radon barrier cover is a minimum of 18 inches thick or as otherwise specified.
Following a seasonal shutdown or period of prolonged exposure to inclement weather or freezing temperatures. the last lift of clay material previously placed and accepted is visually examined and tested in accordance with Specification _ S-404-1, Part VII. Section 5.0, Article 5.1.3
Random filVfrost barrier material is comprised of inorganic soils having a Unified Soils Classification System classification of CL and/or CH, maximum size of .2. inches and is removed from an approved Borrow Source and placed in a cover layer over the clay soil radon barrier.
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QUALITY PLAN NO. QP-404-1 REPOSITORY CONSTRUCTION
APPENDIX A (7) The random fill/frost barrier material is placed in horizontal compacted lifts not
exceeding 1 foot in thickness and compacted to at least 95 percent of the Standard Proctor Maximum Density at a moisture content above minus 2 percent of optimum.
(8) The random fill frost barrier is at least 4.5 feet thick or as otherwise specified.
(9) Riprap excavated from the Burbank Quarry or other approved Borrow Source or stockpile having a gradation as specified on the revised project Drawings is placed over the random fill frost barrier.
(10) The riprap is placed in a single lift in such a manner so as to minimize segregation and receives at least two passes of a D-7 Dozer or equivalent.
{11) Accumulation ofriprap sizes less than the minimum DS0 size is removed and blended with subsequently delivered loads to meet the desired gradation.
(12) The riprap layer is at least I foot thick.
(13) The frequency of Quality Control Tests shall be in accordance with the Specifications for reclamation cover construction.
4.0 Surface Runoff Control Facilities
The QC Officer shall verify the following:
(1) The exposed rockfill buttresses and Tailings Pile surfaces are regraded during repository construction as necessary to prevent gullies from forming.
(2) Drainage on top of the contaminated material on the repository is maintained by providing a minimum 1 percent slope towards the back of the repository.
(3) Following precipitation events, collected runoff is continuously pumped from the top surface of the repository so that the water is drawn down as soon as is practicable. Under no circumstance will collected water be allowed to pond on the top surface of the repository for more than 10 days after stonn events.
(4) Pennanent Groin Channels TP2 and TP3 and diversion ditches B-1 and B-2 are constructed at the locations and to the lines and grades shown on Drawings P-404-8 and P-404-10.
(5) Permanent Channels and ditches are lined with the specified Type of riprap where excavated or constructed in soils in accordance with the Specifications.
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6.0 Monitoring Devices
QUALITY PLAN NO. QP-404-I REPOSITORY CONSTRUCTION
APPENDIXA
Monitoring devices shall be installed in and/or modified adjacent to the repository to monitor the performance of the repository or existing Tailings Piles as appropriate during and after construction. The QC Officer shall verify the following:
(I) Existing piezometers presently located on Tailings Piles 2 and 3 are extended as necessary and maintained utilizing similar materials as shown on Drawing P-404-7.
(2) New piezometers are installed as shown on Drawing P-404-7 at locations to be determined in the field. The location of new piezometers are shown on the "AsBuilt" Drawings
(3) Surface movement monuments are installed as shown on Drawing P-404-7 at locations to be determined in the field during repository construction. The location of movement monuments are shown on the "As- Built" Drawings.
The QC Officer shall ensure that monitoring devices are installed in accordance with the Specifications through periodic inspection of the construction.