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 •.

1

2

3

4

5

5

5

6

6

6

6

7

7

7

8

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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 . . . . . . .

9

10

10

10

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 •..•..•

. . . .

11

12

12

13

14

16

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 ••.

. . .

. . . . . . . . . . .

16

18

19

21

21

21

22

22

23

23

24

24

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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 •.

. . . . . . . . . . .

. .

. . .

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. . . . . . . . . • .

25

26

26

26

26

27

28

28

28

29

29

JO

31

32

33

34

35

36

37

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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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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

Page 5

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


Page 6

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 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


(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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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


Laboratory Standard compaction Test


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


QC-7

QC-11.

Page 9

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.


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


Page 10

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


dures for Quality Control for placement of riprap on the rockfill

buttress.

Procedure



Procedure No.

QC-8

QC-11

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Preparation of Riprap Reference Stockpiles


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.


A Compliance Report shall be prepared for the placement of

riprap on the Tailings Piles rockfill buttress.

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2.5


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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


(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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QUALITY PLAN NO. QP-404-l PROJECT NOS. 404, 405 PART II

Page 13

(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


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




Soil Classification for Engineering Purposes



Riprap size Distribution

Sampling of Aggregates and Soils


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

Page 14

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:


not less than one test for each 500 cubic yards of placed fill

material (random fill or clayey cover}.


each lift of fill material placed .

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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.




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

Page 16

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.


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


(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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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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Page 18

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


dures for Quality Control of the placement of the reclamation cover

on the Tailings Piles.

Procedure



Determining the Specific Gravity of

Soil Classification for Engineering


Soils

Purposes

Procedure No.

QC-1

QC-2

QC-3

QC-4

QC-5



Riprap size Distribution

Sampling of Aggregates and Soils


Determining Clay and Random Fill Thickness for Liners and Reclamation Covers

Preparation of Riprap Reference Stockpiles


2.6.3 Frequency of Quality control Tests

QC-7

QC-8

QC-9

QC-11

QC-26

QC-27

QC-28

Page 19

The frequency of Quality Control Tests and Observations shall

Q be as follows:

0


not less than one test for each 500 cubic yards of placed fill

material (earthfill or Clayey Cover).


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

Page 20

(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.




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


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


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


Observations of Excavation


Determining Riprap Thickness for Reclamation covers and Channels


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


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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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


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


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


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 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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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


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


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


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


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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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


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


(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



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 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


(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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APPENDIX A 1.4.3 Field Seams

(I)

(2)

(3)

(4)

2.0

(1)


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


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


(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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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


(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.