257.74(e) naughtonfgd5 safety factor assessment...257.74(e) safety factor assessment fgd pond 5...

CCR Rule Design Criteria

§257.74(e) Safety Factor Assessment

FGD Pond 5

Naughton Power Plant

Kemmerer, Wyoming

October 30, 2017

PREPARED FOR PREPARED BY

PacifiCorp1407 West North Temple

Salt Lake City, UT 84116

(801) 521-0376

Fax (801) 220-4748

Tetra Tech1551 Three Crowns Drive

Suite 210

Casper, Wyoming 826048

PROFESSIONAL ENGINEER CERTIFICATION

I hereby certify, as a Professional Engineer in the State of Wyoming, that the information in this document was

assembled under my direct supervisory control. This report is not intended or represented to be suitable for reuse

by PacifiCorp or others without specific verification or adaptation by the Engineer.

I hereby certify, as a Professional Engineer in the State of Wyoming that the periodic safety factor assessment

provided herein meets the requirements of 40 Code of Federal Regulations §257.74(e). The results of the Periodic

Safety Factor Assessment indicate the FGD Pond 5 meets the minimum required safety factors as required by

§257.74(e).

______________________________ October 30, 2017

Jason M. Stratton, P.E. Date

Design Criteria - §257.74(e) Periodic Safety Factor Assessment PacifiCorp – Naughton Power Plant FGD Pond 5

i October 30, 2017

TABLE OF CONTENTS

PROFESSIONAL ENGINEER CERTIFICATION ......................................................................................................II

1.0 INTRODUCTION ..................................................................................................................................................1

2.0 EXISTING CONDITIONS .....................................................................................................................................1

3.0 SAFETY FACTOR ASSESSMENT ......................................................................................................................1

3.1 Critical Cross Section for Assessment ...........................................................................................................1

3.2 Seismic Condition ..........................................................................................................................................2

3.3 Required Factors of Safety ............................................................................................................................2

3.4 Subsurface Material Properties ......................................................................................................................2

3.5 Liquefaction ....................................................................................................................................................3

3.6 Method of Analysis .........................................................................................................................................3

4.0 CONCLUSIONS ...................................................................................................................................................4

SOURCE(S) ................................................................................................................................................................4

REVISIONS ................................................................................................................................................................5

FIGURES

Figure 1. Site Vicinity ..............................................................................................................................................6

Figure 3.10-1 Stability – Post Construction ...............................................................................................................7

Figure 3.10-2 Stability – Long Term, Static ............................................................................................................ 15

Figure 3.10-2 Stability – Long Term, Seismic ......................................................................................................... 23

APPENDICES

Appendix A. ................................................................................................................. AS-BUILT CONSTRUCTION DRAWINGS


October 30, 2017

1.0 INTRODUCTION

The PacifiCorp Naughton Power Plant is located approximately three miles southwest of Kemmerer, Wyoming.

This report addresses the requirements of §257.74(e) – Periodic Safety Factor Assessment, as it pertains to FGD

Pond 5 at the Plant. FGD Pond 5 was constructed in 2017. This report presents the initial evaluation immediately

following completion of construction and prior to the pond being placed into service.

2.0 EXISTING CONDITIONS

The Naughton Power Plant is located approximately 3 miles southwest of Kemmerer, Wyoming. The Plant consists

of three coal-fueled units, rated with a net dependable capacity of 156 MW, 201 MW, and 330 MW, respectively.

Coal combustion by-products at the Plant include several types of materials including bottom ash, fly ash, and FGD

materials. FGD Pond 5 was constructed in 2017 at the location shown on Figure 1. The pond has a permitted

capacity of 1,467 acre-ft which is expected to provide approximately 10 years of disposal capacity. The pond may remain operational when full to allow additional evaporation of water. As water evaporates, additional effluent may be added eventually filling the pond with solids. When filled with solids or when continued operation is no longer feasible, a cover will be constructed and the pond will be permanently closed.

The pond has a surface area of 49 acres at the crest with a maximum interior depth of 46 ft. The pond is located on a topographically high area with surface water drainage away from the pond in all directions. The only source of water or waste entering the pond is through two effluent delivery pipelines as well as any precipitation falling within the pond area. No surface water run-on is allowed to enter the pond. The pond has no discharge outlets or spillways (all water entering the pond will be evaporated). The pond embankments have 3 horizontal to 1 vertical slopes and was constructed using soil excavated from within the pond limits and an adjacent borrow area. The pond foundation materials consist of stiff clay and claystone bedrock. Permanent ballast consisting of grout filled tubes was placed over the geomembrane to prevent wind damage. A chain link security fence was installed around the pond to prevent larger wildlife from entering the area. A bird hazing system was installed to reduce impacts to migratory water fowl.

The pond was constructed with a composite liner system consisting of a 60-mil HDPE geomembrane (upper component) in direct contact with a two-foot layer of compacted soil with a hydraulic conductivity of no more than 1 x 10-7 cm/sec (lower component) (Clay liner material obtained from claystone bedrock borrow indicated in Appendix B).

3.0 SAFETY FACTOR ASSESSMENT

3.1 Critical Cross Section for Assessment

The critical cross section for assessment is the dam section anticipated to be the most susceptible to structural failure based on appropriate engineering considerations, including loading conditions. The critical cross section is section D/07/06 as shown on Sheets 6 and 7 of the construction drawings. This cross-section represents the greatest embankment height (55 ft) and exterior grades sloping away from the embankment. The section was modelled assuming the greatest thickness of overburden encountered in the exploratory borings at any location within the new pond.


October 30, 2017

3.2 Seismic Condition

The seismic condition was modelled using a peak ground acceleration of 0.169g. This value was obtained from the latest U.S. Geological Survey (USGS) seismic hazard map for a seismic event with a 2% probability of exceedance in 50 years as presented in Section 3.4 Seismic Impact Zones and as required by §257.53 Definitions.

3.3 Required Factors of Safety

The following minimum required safety factors must be met for the conditions noted:

§257.74(e)(1)(i) end-of-construction (1.3 min)

§257.74(e)(1)(ii) long-term, maximum storage pool (1.5 min)

§257.74(e)(1)(iii) surcharge pool loading (1.4 min)

§257.74(e)(1)(iv) seismic loading (1.0 min)

§257.74(e)(1)(v) liquefaction (1.2 min if applicable)

The long term maximum storage pool elevation (6657.50 ft) was assumed to be equal the surcharge pool elevation (6657.75 ft). The difference between the maximum storage pool elevation and surcharge pool elevation is negligible because run-on from storm events is not permitted to enter the pond. Only precipitation falling within the pond area increases the surcharge pool elevation. For a 100-year, 24-hour storm event, the surcharge pool increases about 3 inches from normal operating elevations. Separate analysis for surcharge pool loading was not conducted as it would be identical to the long-term, maximum storage pool condition based on this assumption. Therefore, the higher safety factor of 1.5 is being applied to the surcharge pool loading condition which only requires a safety factor of 1.4.

3.4 Subsurface Material Properties

Soil strength parameters were selected based on the testing of actual materials of construction noted in Appendix B Geotechnical Study and previous studies at the Naughton Power Plant. These soil strength parameters represent unconsolidated-undrained conditions for modelling post-construction conditions and consolidated-drained conditions for modelling long-term loading conditions. These values are reasonable based on the engineering index properties of the materials. The following table presents the shear strength parameters:

Soil Layer Post-Construction Shear Strength

Long-Term Shear Strength

C Phi C Phi

psf degrees psf degrees

Clay (Fill) 1650 0 132.4 26.7


October 30, 2017

3.5 Liquefaction

Soil liquefaction consists of shear strength reduction and associated deformation of saturated, cohesionless materials caused by excess pore pressures in response to seismic loading. A liquefaction analysis was performed to determine the Factor of Safety (FOS) against liquefaction, and verify the FOS is equal to or greater than 1.2 as required by §257.74(e)(1)(iv) of the EPA CCR Rule. The applicable peak ground acceleration used in the analyses was previously stated above.

The analysis method (Soil Liquefaction During Earthquakes, Idriss and Boulanger, 2008) to evaluate liquefaction potential was based on available standard penetration test (SPT) data from geotechnical borings. Following the methodology, the field-measured SPT blow counts are corrected to account for a variety of factors including the rod length, the SPT hammer energy, the borehole diameter, the specific type of SPT sampler used, and the overburden conditions. The corrected blow counts, the soil unit weight, the fines content, and the depth to groundwater, along with the design PGA and earthquake magnitude, are used to calculate the FOS against liquefaction. A full explanation of the procedure is beyond the scope of this report, and can be found in the reference.

The on-site soils are predominantly fine-grained, cohesive soils and are not liquefaction susceptible, therefore liquefaction analysis was not applicable. In order for a fine-grained material to be liquefaction susceptible, it must meet all of the following criteria (Geotechnical Earthquake Engineering Handbook, Day, 2002):

• The soil must have less than 15 percent finer than 0.005mm (clay fraction)

• The soil must have a liquid limit (LL) less than 35.

• The water content of the soil must be greater than 90% of the LL.

Because the on-site soil is predominantly clay, the Idriss and Boulanger analysis method is not applicable and the site is not considered susceptible to seismic liquefaction.

3.6 Method of Analysis

Safety factors were calculated using Slide version 7.013 by RocScience Inc. (Build date March 1, 2016). Slide is a two dimensional slope stability program which analyzes the stability of slip surfaces using vertical slice limit equilibrium methods. Calculations were conducted using Spencer’s method as it fully satisfies all conditions of equilibrium. Computer output of the stability analyses is presented on Figures 3.10-1, 3.10-2, and 3.10-3.

Clay and Weathered Claystone

1800 0 0 30.0

Claystone 4000 0 4000 0


October 30, 2017

4.0 CONCLUSIONS

The results of the periodic safety factor assessment indicate FGD Pond 5 meets the minimum required safety factors as required by §257.74(e). The results of the assessment are presented in the following table:

Loading Condition Safety Factor

Required Calculated

Post-Construction 1.300 2.505

Long-term, maximum storage pool

1.500 1.847

Maximum surcharge pool 1.400 1.847

Seismic 1.000 1.112

Liquefaction NA NA

.

SOURCE(S)

[1] USEPA, 2015. 40 CFR Parts 257 and 261, Hazardous and Solid Waste Management System; Disposal of Coal Combustion Residuals from Electric Utilities; Final Rule. April 17, 2015. 201 pp.


October 30, 2017

REVISIONS

Revision

Number Date Revision Made By Whom

0 10/30/2017 Initial Issue Tetra Tech

SEC. 12

SE

C. 1

SE

C. 6

1

2

3

4

5

6

POINT COORDINATES

Point #

1

2

3

4

5

6

7

8

Northing

780,549.81'

780,840.84'

780,705.88'

780,313.29'

779,532.25'

779,251.20'

779,298.33'

779,615.00'

Easting

2,485,709.83'

2,485,938.61'

2,486,941.83'

2,487,845.06'

2,487,921.40'

2,487,426.65'

2,485,988.22'

2,485,679.07'

R:\N

-S

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acifiC

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aughton F

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AD

D\S

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ap.dw

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AV

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:1/12/17

P

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B

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www.tetratech.com

0 Feet

This Drawing, in the form transmitted, is the original work product of TETRA TECH. This drawing cannot be altered, revised or reproduced without the prior written consent of TETRA TECH. An original will be retained by TETRA TECH as the "record copy" for purposes of this project. TETRA TECH does not approve of or warrant these documents if any alteration or modification is made without TETRA TECH's written approval.

FIGURE 1

FGD EFFLUENT DISPOSAL POND 5

NAUGHTON POWER PLANT

KEMMERER, WYOMING

SITE VICINITY

500

January 12, 2017

1551 Three Crowns Drive, Suite 210

Casper, WY 82604

NEW FGD EFFLUENT

DISPOSAL POND 5

C

O

.

R

D

.

3

0

4

(

E

L

K

O

L

R

O

A

D

)

NEW EFFLUENT PIPELINE

NEW FGD POND 5

ACCESS ROAD

UTAH

COLORADO

NEBRASKA

SOUTH

DAKOTA

MONTANA

ID

AH

O

CHEYENNE

LARAMIE

SARATOGA

RAWLINS

ROCK SPRINGS

HANNA

MEDICINE BOW

WHEATLAND

TORRINGTON

SUNRISE

DOUGLAS

GLENROCK

LANCE CREEK

EVANSVILLE

CASPER

MIDWEST

LINCH

NEWCASTLE

MOORCROFT

SUNDANCE

GILLETTE

SHEDIDAN

BUFFALO

TEN SLEEP

BASIN

WORLAND

THERMOPOLIS

GREYBULL

CODY

SHOSHONI

RIVERTON

LANDER

FORT WASHAKIE

PINEDALE

BIG PINEY

AFTON

JACKSON

DUBOIS

MORAN

POWELL

LOVELL

EDEN

KEMMERER

GREEN RIVER

MOUNTAIN

VIEW

LYMAN

EVANSTON

ORCHARD VALLEY

LUSK

KEY MAP

All point coordinates are in the NAD83

Wyoming State Planes, West Zone, US

Foot datum.

FGD Effluent Disposal Pond 5 PacifiCorp – Naughton Power Plant

November, 2016

Slide Analysis InformationFGD Pond 5

Project SummaryNaughton Post Construction.slmd - Group 1 - Scenario 1File Name:7.013SlideModeler Version:FGD Pond 5Project Title:Post ConstructionAnalysis:Tetra TechCompany:November 2016Date Created:

General SettingsImperial UnitsUnits of Measurement:daysTime Units:feet/secondPermeability Units:Right to LeftFailure Direction:StandardData Output:20Maximum Material Properties:20Maximum Support Properties:

Analysis OptionsVerticalSlices Type:

Analysis Methods UsedSpencer50Number of slices:0.005Tolerance:75Maximum number of iterations:YesCheck malpha < 0.2:YesCreate Interslice boundaries at intersectionswith water tables and piezos:1Initial trial value of FS:YesSteffensen Iteration:

Groundwater AnalysisWater SurfacesGroundwater Method:62.4Pore Fluid Unit Weight [lbs/ft3]:NoneAdvanced Groundwater Method:

FGD Pond 5: Page 1 of 7SLIDEINTERPRET 7.013

Naughton Post Construction.slmd Tetra Tech November 2016

RandomNumbers10116Pseudo-random Seed:Park and Miller v.3Random Number Generation Method:

Surface OptionsCircularSurface Type:Grid SearchSearch Method:10Radius Increment:DisabledComposite Surfaces:Invalid SurfacesReverse Curvature:Not DefinedMinimum Elevation:Not DefinedMinimum Depth:Not DefinedMinimum Area:Not DefinedMinimum Weight:

SeismicNoAdvanced seismic analysis:NoStaged pseudostatic analysis:

Material PropertiesClaystoneClayFillProperty

ColorMohr-CoulombMohr-CoulombMohr-CoulombStrength Type

130130.2125.7Unit Weight [lbs/ft3]400018001650Cohesion [psf]

0100Friction Angle [deg]NoneNoneNoneWater Surface

000Ru Value

Global MinimumsMethod: spencer



2.504660FS308.499, 6942.089Center:165.682Radius:220.031, 6802.003Left Slip Surface Endpoint:450.884, 6857.372Right Slip Surface Endpoint:1.08427e+008 lb-ftResisting Moment:4.32903e+007 lb-ftDriving Moment:587318 lbResisting Horizontal Force:234491 lbDriving Horizontal Force:8969.35 ft2Total Slice Area:230.853 ftSurface Horizontal Width:38.8531 ftSurface Average Height:

Valid / Invalid SurfacesMethod: spencer

4198Number of Valid Surfaces:653Number of Invalid Surfaces:

Error Codes:Error Code -103 reported for 604 surfacesError Code -108 reported for 49 surfaces

Error CodesThe following errors were encountered during the computation:-103 = Two surface / slope intersections, but one or more surface / nonslope external polygon intersections lie between them.This usually occurs when the slip surface extends past the bottom of the soil region, but may also occur on a benched slopemodel with two sets of Slope Limits.-108 = Total driving moment or total driving force < 0.1. This is to limit the calculation of extremely high safety factors if thedriving force is very small (0.1 is an arbitrary number).

Slice DataGlobal Minimum Query (spencer) - Safety Factor: 2.50466



EffectiveNormalStress[psf]PorePressure[psf]

BaseNormalStress[psf]ShearStrength[psf]

ShearStress[psf]BaseFrictionAngle[degrees]

BaseCohesion[psf]BaseMaterial

Angleof SliceBase[degrees]Weight[lbs]Width[ft]SliceNumber

915.3370915.3371961.4783.1101800Clay-31.3458969.0334.5816711349.0901349.092037.88813.636101800Clay-29.50782848.134.5816721746.501746.52107.96841.614101800Clay-27.70274612.394.5816732110.5102110.512172.14867.24101800Clay-25.9276267.614.5816742443.602443.62230.87890.689101800Clay-24.17767818.794.5816752747.8502747.852284.52912.108101800Clay-22.4529270.324.5816763040.7203040.722336.16932.726101800Clay-20.747610690.44.5816773418.0803418.082402.7959.293101800Clay-19.062212475.14.5816783790.5603790.562468.38985.515101800Clay-17.393814259.74.5816794137.7304137.732529.591009.95101800Clay-15.740515957.24.58167104460.7104460.712586.541032.69101800Clay-14.100517569.94.58167114760.5204760.522639.411053.8101800Clay-12.472319099.64.58167125038.0205038.022688.341073.33101800Clay-10.854220548.24.58167135293.9905293.992733.471091.35101800Clay-9.244921916.94.58167145529.0605529.062774.921107.9101800Clay-7.64289232074.58167155743.8605743.862812.81123.03101800Clay-6.0468824419.44.58167165938.8205938.822847.181136.75101800Clay-4.4555725554.94.58167176114.4306114.432878.141149.11101800Clay-2.8677266144.58167186271.0106271.012905.751160.14101800Clay-1.2820327597.34.58167196408.8906408.892930.061169.84101800Clay0.302651285054.58167206528.2906528.292951.111178.25101800Clay1.88757293374.58167216629.4406629.442968.951185.37101800Clay3.4739330093.24.58167226712.4706712.472983.591191.22101800Clay5.0629730773.44.58167236777.4806777.482995.051195.79101800Clay6.6559331377.14.58167246824.5206824.523003.351199.1101800Clay8.2540731903.74.58167256853.6306853.633008.481201.15101800Clay9.8587232352.24.58167266864.7306864.733010.441201.94101800Clay11.471232721.74.58167276857.7406857.743009.21201.44101800Clay13.09333010.84.58167286832.5306832.533004.761199.67101800Clay14.7255332184.58167296788.9106788.912997.071196.6101800Clay16.370433341.74.58167306726.6706726.672986.091192.21101800Clay18.029233379.74.58167316645.4906645.492971.781186.5101800Clay19.703933329.84.58167326545.0106545.012954.061179.43101800Clay21.396333189.24.58167336424.8306424.832932.871170.97101800Clay23.108532954.84.58167346284.4506284.452908.121161.08101800Clay24.842932623.34.58167356123.2806123.282879.71149.74101800Clay26.60232190.54.58167365940.6705940.672847.51136.88101800Clay28.388631651.84.58167375735.8405735.842811.381122.46101800Clay30.2058310024.58167385507.8905507.892771.191106.41101800Clay32.057330234.94.58167395255.805255.82726.741088.67101800Clay33.947229343.44.58167404978.3404978.342677.811069.13101800Clay35.8828319.24.58167414674.104674.12624.171047.71101800Clay37.861327152.64.58167424555.6804555.681650658.77201650Fill39.948127069.84.80281434078.4804078.481650658.77201650Fill42.151624884.94.8028144

3504035041650658.77201650Fill44.434922151.14.80281452891.0502891.051650658.77201650Fill46.811519185.24.80281462235.0202235.021650658.77201650Fill49.298615955.34.80281471529.8201529.821650658.77201650Fill51.918712419.74.8028148692.2530692.2531650658.77201650Fill54.70268082.044.8028149-295.6360-295.6361650658.77201650Fill57.69412776.024.8028150



Interslice DataGlobal Minimum Query (spencer) - Safety Factor: 2.50466



IntersliceForce Angle[degrees]IntersliceShear Force[lbs]

IntersliceNormal Force[lbs]Ycoordinate - Bottom[ft]

Xcoordinate[ft]SliceNumber

0006802220.03119.680321046.996137.846799.21224.61329.680332278.8113359.26796.62229.19539.680343652.4421411.96794.21233.77649.680365131.2630081.26791.99238.35859.680346683.8939183.36789.93242.9469.680348283.2848559.56788.04247.52179.680349911.5758105.16786.3252.10389.6803211583.467906.16784.72256.68599.6803313280.777856.26783.28261.266109.6803514980.587820.96781.99265.848119.6803616662.397680.16780.84270.43129.6803218307.81073276779.83275.011139.6803219900.51166646778.95279.593149.6803521425.91256066778.2284.175159.6803322870.51340756777.59288.756169.6803724222.61420016777.1293.338179.6803725471.61493236776.74297.92189.6803326607.91559856776.52302.501199.6803427623.21619376776.41307.083209.6803128509.81671356776.44311.665219.6803829261.41715406776.59316.246229.6803329872.11751216776.87320.828239.6803330337.11778476777.27325.41249.6803530652.41796956777.81329.991259.6803730814.71806466778.47334.573269.6803330821.41806866779.27339.155279.6803430670.81798036780.2343.736289.6803630362.11779936781.26348.318299.6803729895.11752556782.47352.9309.6803429270.51715946783.81357.481319.6803328489.91670186785.3362.063329.68034275561615436786.95366.645339.6803726472.41551906788.74371.226349.6803425243.81479886790.7375.808359.6803523876.11399706792.82380.39369.6803622376.91311816795.11384.971379.6803220755.11216746797.59389.553389.6803719021.61115116800.25394.135399.6803717189.41007706803.12398.716409.680341527489541.66806.21403.298419.6803713294.2779356809.52407.88429.6803811272.266081.36813.08412.461439.680348685.1750915.56817.11417.264449.680356199.5836344.16821.45422.067459.680323923.9823003.86826.16426.87469.68031939.7611371.66831.28431.67347

9.68033350.0762052.276836.86436.476489.68034-710.401-4164.626842.99441.278499.68034-972.446-5700.826849.78446.08150

0006857.37450.88451



List Of CoordinatesExternal Boundary

YX6800067750670006700561.56775561.5

6820.5561.56860.5441.56860.5416.568052506800200

Material BoundaryYX6805250

6820.5561.5

Material BoundaryYX

677506775561.5




November, 2016

Slide Analysis InformationNaughton FGD Pond 5

Project SummaryNaughton Long Term.slmd - Group 1 - StaticFile Name:7.013SlideModeler Version:Naughton FGD Pond 5Project Title:Long TermAnalysis:Tetra TechCompany:November 2016Date Created:





Naughton FGD Pond 5: Page 1 of 7SLIDEINTERPRET 7.013

Naughton Long Term.slmd Tetra Tech November 2016




Material PropertiesPondWaterClaystoneClayFillProperty

ColorMohr-CoulombMohr-CoulombMohr-CoulombMohr-CoulombStrength Type

62.4130130.2125.7Unit Weight [lbs/ft3]040000132.4Cohesion [psf]003026.7Friction Angle [deg]

Water TableWater TableWater TableWater TableWater Surface1111Hu Value







Error Codes:Error Code -103 reported for 604 surfacesError Code -108 reported for 23 surfacesError Code -112 reported for 2 surfaces

Error CodesThe following errors were encountered during the computation:-103 = Two surface / slope intersections, but one or more surface / nonslope external polygon intersections lie between them.This usually occurs when the slip surface extends past the bottom of the soil region, but may also occur on a benched slopemodel with two sets of Slope Limits.-108 = Total driving moment or total driving force < 0.1. This is to limit the calculation of extremely high safety factors if thedriving force is very small (0.1 is an arbitrary number).-112 = The coefficient M-Alpha = cos(alpha)(1+tan(alpha)tan(phi)/F) < 0.2 for the final iteration of the safety factor calculation.This screens out some slip surfaces which may not be valid in the context of the analysis, in particular, deep seated slip surfaceswith many high negative base angle slices in the passive zone.









77.983549.6323127.61645.023824.3809300Clay-17.7966513.2124.955711223.162145.228368.39128.84269.7695300Clay-16.55571501.74.955712351.201233.557584.758202.765109.8300Clay-15.32282415.044.955713467.377314.751782.128269.84146.122300Clay-14.09723269.964.955714614.081399.6681013.75354.54191.988300Clay-12.8784280.594.955715761.623480.1971241.82439.723238.115300Clay-11.66485295.954.955716894.396553.9141448.31516.38279.626300Clay-10.45696240.854.9557171013.34620.9011634.25585.055316.814300Clay-9.253637116.174.9557181119.32681.2311800.56646.243349.949300Clay-8.054487922.664.9557191213.1734.9681948.07700.386379.268300Clay-6.858888660.974.95571101295.39782.1672077.55747.886404.989300Clay-5.666279331.674.95571111366.79822.8712189.66789.11427.313300Clay-4.476129935.224.95571121427.89857.1162285.01824.39446.417300Clay-3.28791104724.95571131483.13884.932368.06856.279463.686300Clay-2.101110959.64.95571141635.26906.3322541.59944.12511.253300Clay-0.91520411861.14.95571151823.25921.3322744.581052.66570.028300Clay0.27030412913.74.95571161998.96929.9312928.891154.1624.959300Clay1.45593139004.95571172162.87932.1263094.991248.74676.208300Clay2.6421814820.14.95571182315.46927.93243.361336.83723.91300Clay3.8295615673.84.95571192457.17917.2313374.41418.64768.211300Clay5.0185916460.94.95571202588.37900.0883488.451494.39809.231300Clay6.209817181.14.95571212709.41876.4323585.841564.28847.077300Clay7.403717833.94.95571222820.67846.2143666.891628.52881.864300Clay8.6008518418.94.95571232922.45809.3743731.831687.28913.683300Clay9.801818935.44.95571243015.01765.8473780.861740.72942.621300Clay11.007119382.74.95571253098.63715.5523814.181789968.766300Clay12.2174197604.95571263173.57658.4033831.971832.27992.197300Clay13.433220066.54.95571273240.05594.2983834.351870.651012.98300Clay14.655320301.14.95571283298.29523.1253821.411904.271031.19300Clay15.884120462.64.95571293348.48444.7583793.241933.241046.87300Clay17.120620549.64.95571303390.8359.0593749.861957.681060.11300Clay18.365320560.94.95571313425.44265.8733691.311977.681070.94300Clay19.619120494.84.95571323452.57165.0273617.61993.341079.42300Clay20.882720349.44.95571333472.3256.33383528.652004.751085.6300Clay22.157120122.94.95571343432.67-54.55783432.671981.851073.2300Clay23.38217966.24.48959353332.08-167.1153332.081923.771041.75300Clay24.557417648.34.48959363228.69-294.0413228.691756.27951.04226.7132.4Fill25.813619266.55.01132373099.15-436.4553099.151691.11915.75726.7132.4Fill27.15318745.75.01132382956.06-588.1632956.061619.14876.78426.7132.4Fill28.508718131.15.01132392799.44-749.5212799.441540.37834.12926.7132.4Fill29.88217419.15.01132402629.26-920.9242629.261454.78787.78126.7132.4Fill31.274516605.75.01132412445.46-1102.822445.461362.34737.72426.7132.4Fill32.68815686.55.01132422248.01-1295.692248.011263.03683.94626.7132.4Fill34.124214656.35.01132432036.84-1500.122036.841156.82626.43226.7132.4Fill35.585213509.55.01132441811.87-1716.721811.871043.68565.16426.7132.4Fill37.073412239.85.01132451573.03-1946.231573.03923.548500.11326.7132.4Fill38.591510839.95.01132461320.21-2189.461320.21796.395431.25826.7132.4Fill40.14249301.45.01132471029.54-2447.361029.54650.207352.09526.7132.4Fill41.729674485.0113248615.772-2721.03615.772442.101239.40326.7132.4Fill43.35714650.365.0113249177.378-3011.77177.378221.612120.00526.7132.4Fill45.029515805.0113250






0006800181.712114.25582.3212324.0236798.41186.668214.255308.1831213.036796.94191.624314.255648.372552.036795.58196.58414.2551079.934250.686794.33201.535514.2551613.846352.26793.2206.4916

14.25492236.898804.596792.18211.447714.25492926.0511517.26791.26216.402814.25493660.7914409.26790.46221.358914.2554422.8917408.86789.75226.3141014.2555196.1820452.66789.16231.271114.2555966.4123484.26788.67236.22512

14.25496721.0726454.76788.28241.1811314.25497449.28293216787.99246.1371414.2558143.38320536787.81251.0921514.2558839.234791.86787.73256.0481614.2559541.7137556.96787.76261.0041714.25510236.1402906787.88265.961814.2551090942938.56788.11270.9151914.25511548.545455.76788.44275.87120

14.254912144.147800.26788.88280.8272114.25512686.749935.86789.42285.7822214.25513168.251831.16790.06290.7382314.2551358253459.66790.81295.6942414.25513922.454799.66791.67300.64925

14.254914185.155833.86792.63305.6052614.2551436756549.56793.7310.5612714.25514465.856938.46794.89315.5172814.25514480.756997.16796.18320.47229

14.254914411.956726.56797.59325.4283014.25514260.956132.16799.12330.3843114.25514030.455224.66800.77335.3393214.25513724.254019.56802.53340.29533

14.254913347.652537.46804.42345.2513414.254912907.450804.76806.44350.2073514.25512440.648967.16808.38354.69636

14.25491189446815.86810.43359.1863714.25511118.443762.86812.86364.1973814.25510262.440393.56815.43369.2083914.2559336.2236748.16818.15374.224014.2558351.8732873.66821.03379.23141

14.25497323.1428824.56824.07384.2424214.2556265.9524663.36827.29389.25443

14.25495198.5420461.96830.68394.2654414.25494141.7816302.46834.27399.2764514.25493119.4912278.66838.06404.2884614.2552158.958497.786842.06409.2994714.2551291.335082.786846.28414.3148

14.2549571.2252248.396850.75419.3224914.255136.238536.2446855.48424.33350

0006860.5429.34451



List Of CoordinatesWater Table

YX680006800200

6815.5561.5

External BoundaryYX6800067750670006700561.56775561.5

6820.5561.56857.75561.56857.75449.756860.5441.56860.5416.568052506800200


6820.5561.5

Material BoundaryYX

677506775561.5

Material BoundaryYX

6857.75449.756820.5561.5




November, 2016

Slide Analysis InformationNaughton FGD Pond 5

Project SummaryNaughton Long Term.slmd - Group 1 - SeismicFile Name:7.013SlideModeler Version:Naughton FGD Pond 5Project Title:Long TermAnalysis:Tetra TechCompany:November 2016Date Created:










Loading0.169Seismic Load Coefficient (Horizontal):

Material PropertiesPondWaterClaystoneClayFillProperty

ColorMohr-CoulombMohr-CoulombMohr-CoulombMohr-CoulombStrength Type

62.4130130.2125.7Unit Weight [lbs/ft3]040000132.4Cohesion [psf]003026.7Friction Angle [deg]

Water TableWater TableWater TableWater TableWater Surface1111Hu Value







Error Codes:Error Code -103 reported for 604 surfacesError Code -111 reported for 3 surfacesError Code -112 reported for 26 surfaces

Error CodesThe following errors were encountered during the computation:-103 = Two surface / slope intersections, but one or more surface / nonslope external polygon intersections lie between them.This usually occurs when the slip surface extends past the bottom of the soil region, but may also occur on a benched slopemodel with two sets of Slope Limits.-111 = safety factor equation did not converge-112 = The coefficient M-Alpha = cos(alpha)(1+tan(alpha)tan(phi)/F) < 0.2 for the final iteration of the safety factor calculation.This screens out some slip surfaces which may not be valid in the context of the analysis, in particular, deep seated slip surfaceswith many high negative base angle slices in the passive zone.









108.60551.7296160.33462.70356.4124300Clay-18.2231543.5645.035991303.131151.384454.515175.013157.455300Clay-16.96251590.715.035992465.952243.505709.457269.017242.028300Clay-15.71032558.75.035993601.255328.236929.491347.135312.309300Clay-14.46583449.035.035994712.54405.7051118.24411.385370.114300Clay-13.22824263.065.035995

807.087476.0281283.11465.972419.224300Clay-11.99695016.325.035996935.766550.0121485.78540.264486.063300Clay-10.77125929.275.0359971063.78619.8131683.59614.173552.557300Clay-9.550426851.345.0359981172.65682.7391855.39677.028609.107300Clay-8.334027701.185.0359991264.35738.862003.21729.97656.737300Clay-7.12148479.515.03599101340.58788.2352128.81773.987696.338300Clay-5.911989186.955.03599111402.86830.9112233.77809.94728.684300Clay-4.70529824.015.03599121452.47866.9292319.4838.583754.454300Clay-3.500510391.15.03599131490.57896.3182386.88860.58774.244300Clay-2.2973610888.55.03599141518.17919.0992437.27876.519788.584300Clay-1.0952211316.55.03599151547.64935.2852482.92893.526803.885300Clay0.10642611724.75.03599161689.98944.8792634.86975.707877.821300Clay1.3081212603.85.03599171851.07947.8762798.941068.72961.503300Clay2.510413562.15.03599181997.68944.2632941.951153.361037.65300Clay3.7137814450.85.03599192130.81934.0163064.831230.231106.81300Clay4.918815269.95.03599202251.36917.1043168.461299.831169.43300Clay6.1260116018.95.03599212360.13893.4863253.611362.621225.92300Clay7.3359616697.55.03599222457.86863.1113320.971419.051276.69300Clay8.54921173055.03599232545.22825.923371.141469.491322.07300Clay9.76633178415.03599242622.81781.8423404.651514.291362.37300Clay10.987918304.55.03599252691.22730.7963422.011553.771397.89300Clay12.214618694.95.03599262750.93672.6883423.621588.251428.91300Clay13.447190115.03599272802.41607.4153409.831617.981455.66300Clay14.685819251.95.03599282846.14534.85933811643.221478.37300Clay15.931619416.25.03599292882.5454.8893337.391664.211497.25300Clay17.185219502.65.03599302911.87367.3573279.221681.171512.51300Clay18.447419509.65.03599312934.62272.1023206.721694.311524.33300Clay19.718919435.45.03599322951.09168.9443120.031703.821532.89300Clay21.000619278.25.03599332961.6157.68273019.31709.891538.35300Clay22.293419035.85.03599342913.92-53.78072913.921682.361513.58300Clay23.514416346.84.39466352807.32-164.642807.321620.81458.2300Clay24.663116035.94.39466362692.24-291.2032692.241486.461337.3326.7132.4Fill25.906917912.95.02889372558.4-434.7632558.41419.141276.7726.7132.4Fill27.248717381.95.02889382414.11-587.6832414.111346.571211.4826.7132.4Fill28.606816756.15.02889392259.58-750.3222259.581268.851141.5626.7132.4Fill29.982816031.85.0288940

2095-923.08220951186.071067.0826.7132.4Fill31.378115205.15.02889411920.56-1106.411920.561098.34988.1526.7132.4Fill32.794514271.25.02889421736.44-1300.821736.441005.74904.84326.7132.4Fill34.233813225.25.02889431542.87-1506.871542.87908.382817.2526.7132.4Fill35.698212061.25.02889441340.04-1725.21340.04806.367725.4726.7132.4Fill37.1910772.75.02889451128.17-1956.551128.17699.812629.60526.7132.4Fill38.71199352.45.0288946907.547-2201.76907.547588.848529.77326.7132.4Fill40.2677791.725.0288947678.454-2461.78678.454473.627426.11126.7132.4Fill41.85876080.95.0288948441.204-2737.75441.204354.302318.75726.7132.4Fill43.49124208.085.0288949133.712-3030.98133.712199.65179.62126.7132.4Fill45.1691598.875.0288950






0006800171.267121.0124176.151458.5926798.34176.303221.0124646.2071682.346796.81181.339321.01251335.1834766795.39186.375421.01242180.385676.46794.09191.411521.01253129.48147.076792.91196.447621.01244143.6410787.66791.84201.483721.01255247.4913661.36790.88206.519821.01256421.5116717.76790.03211.555921.01247627.7819858.26789.29216.5911021.01258834.222998.96788.66221.6271121.012410013.726069.76788.14226.6631221.012411143.829011.86787.73231.6991321.012512205.931776.76787.42236.7351421.012413184.734325.16787.22241.7711521.012514068.536625.96787.12246.8071621.012514856.438677.16787.13251.8431721.01241562340672.96787.25256.8791821.012416368.6426146787.47261.9151921.012417072.144445.56787.79266.9512021.012417715.646120.86788.23271.9872121.012418284.247601.26788.77277.0232221.012518765.9488556789.42282.0592321.01251915149857.66790.17287.0952421.012419432.550590.66791.04292.1312521.012519605.851041.66792.02297.1672621.012419668.351204.56793.11302.2032721.012419619.951078.56794.31307.2392821.012519462.650668.86795.63312.2752921.012519200.3499866797.07317.3113021.012418839.349046.36798.63322.3473121.012418388.147871.66800.31327.3833221.012417857.246489.56802.11332.4193321.012517259.744933.86804.04337.4553421.012416610.643244.16806.11342.4913521.01251596941573.66808.02346.8853621.012415218.139618.96810.04351.283721.012514117.436753.26812.48356.3093821.012512914.833622.36815.07361.3383921.012411628.330273.26817.81366.3674021.012510278.626759.26820.72371.3964121.01248888.5323140.46823.78376.4254221.01247484.0819484.16827.02381.4534321.01256094.2415865.76830.45386.4824421.01254751.4512369.96834.06391.5114521.01243492.039091.166837.87396.544621.01252356.716135.456841.91401.5694721.01241391.173621.776846.16406.5984821.0124646.8761684.086850.67411.6274921.0124182.071474.0046855.44416.65650

0006860.5421.68551



List Of CoordinatesWater Table

YX680006800200

6815.5561.5

External BoundaryYX6800067750670006700561.56775561.5

6820.5561.56857.75561.56857.75449.756860.5441.56860.5416.568052506800200


6820.5561.5

Material BoundaryYX

677506775561.5

Material BoundaryYX

6857.75449.756820.5561.5




APPENDIX A – AS-BUILT CONSTRUCTION DRAWINGS

TR 78

SEC. 12

SEC. 1

SEC. 33

(R. 116W.)

SEC. 6

SEC. 2

SEC. 11

SEC. 7

R. 1

17

W.

R. 1

16

W.

SEC. 34

(R. 116W.)

SE

C. 1

SE

C. 6

SE

C. 3

3

SE

C. 3

4

NEW EFFLUENT PIPELINE

NEW FGD POND 5 ACCESS ROAD

NEW FGD

EFFLUENT

DISPOSAL

POND 5

SOUTH ASH POND

CLEAR

WATER

PONDS

FGD 4 POND

C

O

.

R

D

.

3

0

4

(

E

L

K

O

L

R

O

A

D

)

EXISTING EFFLUENT PIPELINE

EXISTING PUMP HOUSE

MOTOR CONTROL CENTER

FEET

800' 800' 1600'

1"=800'

2400'0

FGD EFFLUENT DISPOSAL POND 5

NAUGHTON PLANT

KEMMERER, WYOMING

PREPARED FOR: PACIFICORP

NAUGHTON PLANT

P.O. BOX 191

1450 NAUGHTON PLANT ROAD

KEMMERER, WYOMING 83101

PREPARED BY: TETRA TECH

1551 THREE CROWNS DRIVE

SUITE 210

CASPER, WY 82604

SHEET INDEX

DRAWING TITLE

01 COVER AND INDEX

02 NOTES

03 PLAN - EXISTING CONDITIONS

04 PLAN - SUBGRADE

05 CROSS-SECTIONS - SUBGRADE

06 PLAN - FINAL GRADE

07 CROSS-SECTIONS - FINAL GRADE

08 POND DETAILS

09 PLAN AND PROFILE - ROAD

10 PLAN AND PROFILE - PIPELINE

11 PIPELINE DETAILS

1. IN GENERAL, THE PROJECT CONSISTS OF CONSTRUCTING THE NEW FGD POND 5 ATTHE NAUGHTON POWER PLANT LOCATED NEAR KEMMERER, WYOMING. THECONTRACTOR SHALL PROVIDE ALL PERSONNEL, EQUIPMENT, AND MATERIALSNECESSARY TO COMPLETE THE FOLLOWING WORK IN THE FOLLOWING GENERALORDER.

1.1. OBTAIN ALL PERMITS FOR WHICH CONTRACTOR IS RESPONSIBLE.1.2. OBTAIN APPROVAL OF OWNER OF ALL PLANS REQUIRED TO BE IN-PLACE PRIOR TO

MOBILIZATION.1.3. IMPLEMENT BEST MANAGEMENT PRACTICES FOR STORM WATER POLLUTION

PREVENTION.1.4. CONSTRUCT LINCOLN COUNTY ROAD 304 ACCESS1.5. GENERAL MOBILIZATION1.6. CONSTRUCTION PLANT ACCESS ROAD TO ALLOW FOR ACCESS TO CONSTRUCTION

WATER SOURCES.1.7. CLEARING AND TOPSOIL STRIPPING OF POND AREA.1.8. EXCAVATE DIVERSION CHANNEL1.9. EXCAVATE AND FILL WITHIN THE POND AREA TO SUBGRADE ELEVATIONS1.10. CLEARING AND TOPSOIL STRIPPING OF BORROW AREA.1.11. CONSTRUCT COMPACTED CLAY LINER WITH ON-SITE MATERIAL.1.12. INSTALL 60-MIL HDPE GEOMEMBRANE LINER1.13. INSTALL TWO 6-INCH HDPE EFFLUENT DELIVERY PIPELINES.1.14. INSTALL POWER FOR BIRD HAZING SYSTEM1.15. INSTALL POND CREST SURFACING1.16. INSTALL PERMANENT GEOMEMBRANE BALLAST1.17. TEST ENTIRE GEOMEMBRANE INSTALLATION FOLLOWING COMPLETION OF ALL

WORK WITHIN ITS LIMITS. REPAIR ANY DEFECTS.1.18. PLACE TOPSOIL OVER EXTERIOR EMBANKMENTS AND BORROW AREA1.19. INSTALL BIRD HAZING SYSTEM1.20. CONNECT NEW EFFLUENT DELIVERY PIPELINES TO EXISTING EFFLUENT DELIVERY

PIPELINES.1.21. REVEGETATE ALL TOPSOIL AREAS AND ALL AREAS DISTURBED DURING

CONSTRUCTION.1.22. DEMOBILIZE ALL EQUIPMENT AND MATERIALS FROM PROJECT SITE.2. SURVEY AND CONTROL2.1. A TOPOGRAPHIC SURVEY WAS CONDUCTED BY CRANK COMPANIES INC., 41 US.

HWY. 30/189, DIAMONDVILLE, WYOMING, 83116, PHONE (307) 877-9093 DATEDJUNE 2016.

2.2. A REGISTERED WYOMING PROFESSIONAL LAND SURVEYOR SHALL SURVEY THEPROPERTY BOUNDARIES WHERE NEW FENCING IS REQUIRED (SOUTH AND WESTBOUNDARIES).

2.3. REFER TO PROJECT QA/QC MANUAL FOR SURVEYING TOLERANCES3. EARTHWORK3.1. EARTH FILL SHALL BE CONSTRUCTED TO THE FOLLOWING DENSITIES AND MOISTURE

CONTENT:

3.2. ALL FILL SHALL BE PLACED IN MAXIMUM 9-INCH THICK LIFTS (LOOSE). THECONTRACTOR SHALL PROVIDE A DISC OR OTHER SIMILAR EQUIPMENT APPROVED BYTHE OWNER FOR MIXING OF MOISTURE THROUGHOUT THE EMBANKMENT FILL ANDCOMPACTED CLAY LINER LIFTS. EMBANKMENT FILL OR COMPACTED CLAY LINERLIFTS SHALL BE RE-WORKED IF MOISTURE CONTENT IS NOT UNIFORM THROUGHOUTTHE FULL DEPTH OF THE LIFT.

3.3. ALL AREAS OF CUT OR FILL SHALL BE STRIPPED OF TOPSOIL. TEMPORARY TOPSOILSTOCKPILES MAY BE PLACED AT THE CONTRACTORS DISCRETION. A SINGLEPERMANENT TOPSOIL STOCKPILE SHALL BE LOCATED NORTH OF THE NEW POND. A6X12-INCH (MINIMUM) STEEL SIGN LABELED “TOPSOIL” SHALL BE PLACED ON THEPILE SECURELY ATTACHED TO STEEL POST. THE SIGN SHALL BE WHITE WITH BLACKLETTERING.

3.4. ALL FINAL SLOPES SHALL BE 2H:1V OR FLATTER UNLESS OTHERWISE SPECIFIED.POND EMBANKMENT SLOPES ARE SPECIFIED AT 3H:1V OR FLATTER SLOPES.

3.5. THE SIZE AND DEPTH OF THE BORROW SOURCE SHALL BE AT THE CONTRACTOR'SDISCRETION. BORROW AREA EXCAVATIONS SHALL NOT EXTEND BELOW THENATURAL GROUND WATER ELEVATION. UPON COMPLETION OF USE, THE BORROWSOURCE SHALL BE COVERED WITH A 6-INCH THICK TOPSOIL LAYER ANDREVEGETATED. FINAL GRADES WITHIN THE BORROW AREA SHALL BE NO FLATTERTHAN 3% AND SHALL PROVIDE FOR DRAINAGE OF STORM WATER AWAY FROM THEBORROW AREA. NO PONDING OF SURFACE WATER SHALL BE PERMITTED WITHINTHE FINAL BORROW AREA.

3.6. ROCKS LARGER THAN SIX INCHES IN LENGTH SHALL NOT BE PLACED WITHIN FIVE FEET OF THEINTERIOR SLOPE FINAL GRADE. MATERIAL CONTAINING BY VOLUME LESS THAN 25 PERCENT ROCKLARGER THAN SIX INCHES AND LESS THAN 12-INCHES IN LENGTH MAY BE PLACED IN THEREMAINDER OF THE EMBANKMENT.

4. COUNTY ROAD 304 ACCESS4.1. CONTRACTOR SHALL COORDINATE CONSTRUCTION OF ACCESS WITH LINCOLN

COUNTY. APPROPRIATE SAFETY SIGNAGE SHALL BE UTILIZED ON THE COUNTY ROAD.4.2. CONTRACTOR SHALL ACCESS THE WORK SITE FROM COUNTY ROAD 304 TO THE

EXTENT POSSIBLE.5. BIRD HAZING SYSTEM5.1. BIRD HAZING SYSTEM SHALL BE SUPPLIED BY DETECT, INC. AND SHALL CONSIST OF

THE MERLIN BIRD CONTROL RADAR SYSTEM.5.2 CONTRACTOR SHALL DESIGN, SUPPLY, AND CONSTRUCT NEW ELECTRICAL SERVICE

FOR BIRD HAZING SYSTEM.5.2.1 THE SERVICE SHALL SUPPLY A MINIMUM OF 150% OF THE POWER REQUIREMENTS

OF THE BIRD HAZING SYSTEM. POWER SUPPLY PROVIDED AT THE EXISTING MOTORCONTROL CENTER IN THE PUMP HOUSE LOCATED NORTH OF THE CLEAR PONDS(480V, 300A, 3 PHASE). SEE SHEET 1 FOR LOCATION.

5.2.2 POWER LINES SHALL BE BURIED ALONG THE CLEAR POND EMBANKMENTS, WITHINTHE EFFLUENT DELIVERY PIPELINE TRENCH (NOTE EFFLUENT TEMPERATURE AT 160DEGREES F), AND ALONG THE NEW ACCESS ROAD TO THE NEW BIRD HAZING PAD.CONDUIT AT WIRE SHALL BE CONTINUOUS HDPE CONDUIT WITH PRE-INSTALLEDCABLE-IN-CONDUIT PRODUCT AS MANUFACTURED BY ARNCO OR EQUAL.

5.2.3 TRANSFORMER SHALL HAVE 2-5% FCBN FULL CAPACITY TAPS, AND SHALL BE SQUARED MODEL 7540F OR EQUAL. TAPS SHALL BE SET TO COMPENSATE FOR THE VOLTAGEDROP OF THE FEEDER CIRCUIT.

5.2.4 ALL ELECTRICAL WORK SHALL COMPLY WITH THE NATIONAL ELECTRICAL

CODE.THE BIRD HAZING SYSTEM SHALL BE FUNCTIONING AND OPERATIONAL PRIORTO ACCEPTANCE BY THE OWNER.

6. EFFLUENT DELIVERY PIPELINE6.1. CONTRACTOR SHALL COORDINATE CONNECTION OF THE NEW PIPELINE TO THE

EXISTING PIPELINE WITH THE OWNER. CONNECTION SHALL BE COORDINATED SUCHTHAT ONE EXISTING PIPELINE REMAINS IN SERVICE AT ALL TIMES. CONTRACTORSHALL TAKE SAFETY PRECAUTIONS AS EFFLUENT IN THE EXISTING PIPELINES MAY BEAT A TEMPERATURE OF 110°F (SEE NOTES SHEET 10).

7. FENCING7.1. NEW SECURITY FENCE SHALL BE COMPLETED PRIOR TO DEPLOYMENT OF ANY

GEOMEMBRANE IN THE POND.7.2. NEW PERIMETER FENCE SHALL CONSIST OF 6 FT TALL WIRE FABRIC WITH 3-STRAND

BARBED WIRE AT THE TOP.7.3. NEW DOUBLE-SWING MANUALLY OPERATED GATES SHALL BE CONSTRUCTED AT THE

PLANT ACCESS ROAD AND LINCOLN COUNTY ROAD 304 ACCESS. NEW GATES SHALLHAVE A MINIMUM TOTAL SPAN OF 20 FT. GATES SHALL INCLUDE MEANS FORLOCKING WITH A PADDLE LOCK.

7.4. FIELD FENCING SHALL BE INSTALLED AT THE PROPERTY LINE AS NOTED ON SHEET 4.FIELD FENCE SHALL CONSIST OF A LOWER WIRE MESH SECTION AND A 2 STRANDBARBED WIRE UPPER SECTION.

8. COMPACTED CLAY LINER8.1. COMPACTED CLAY LINER SHALL BE INSTALLED IN LIFTS PARALLEL TO THE GROUND

SURFACE.8.2. COMPACTED CLAY LINER SHALL CONSIST OF A MINIMUM COMPACTED THICKNESS

OF 2 FT AND SHALL HAVE A MAXIMUM COEFFICIENT OF HYDRAULIC CONDUCTIVITY(k) OF 1X10-7 cm/s.

8.3. TESTING INDICATES CLAYSTONE FROM THE BORROW AREA WILL MEET THEPERMEABILITY REQUIREMENTS.

9. GEOMEMBRANE9.1. GEOMEMBRANE LINER SHALL CONSIST OF 60-MIL HDPE.9.2. GOEMEMBRANE SHALL BE TEXTURED ON BOTH SIDES WHERE SLOPES EXCEED 10%

GRADES.9.3. ABRASION GUARD: THE ABRASION GUARD SHALL CONSIST OF A 100-MIL THICK

HDPE LINER, TEXTURED BOTH SIDES, PLACED OVER THE 60-MIL HDPE LINER9.4. ALL GEOMEMBRANE SEAM TESTING REQUIRED BY SPECIFICATION WILL BE

CONDUCTED DURING INSTALLATION OF THE GEOMEMBRANE LINER.9.5. RESISTIVITY TESTING OF THE ENTIRE GEOMEMBRANE SURFACE SHALL NOT BE

CONDUCTED UNTIL ALL CONSTRUCTION ACTIVITY ON THE GEOMEMBRANE ISCOMPLETED. CONSTRUCTION ACTIVITY IS NOT COMPLETE UNTIL THE PERMANENTBALLAST SYSTEM HAS BEEN INSTALLED.

10. CRUSHED AGGREGATE BASE COURSE10.1. CRUSHED AGGREGATE BASE COURSE SHALL BE PLACED TO A COMPACTED

THICKNESS OF 8-INCHES IN THE FOLLOWING AREAS:10.1.1. POND CREST10.1.2. ACCESS ROAD10.1.3. BIRD HAZING SYSTEM PAD10.1.4. COUNTY ROAD ACCESS11. TOPSOIL11.1. A 6-INCH THICK LAYER OF LOOSE TOPSOIL SHALL BE PLACED OVER THE FOLLOWING

AREAS:11.1.1. EXTERIOR POND EMBANKMENT SLOPES11.1.2. ROAD EMBANKMENT SLOPES11.1.3. PIPELINE TRENCH11.1.4. BORROW AREA11.1.5. NORTH AND SOUTH DIVERSIONS11.1.6. ANY OTHER AREA STRIPPED OF TOPSOIL AND NOT COVERED BY GEOMEMBRANE

OR ROAD BASE.12. REVEGETATION12.1. FERTILIZER AND SEED SHALL BE APPLIED TO ALL AREAS RECEIVING TOPSOIL OR

OTHERWISE DISTURBED DURING CONSTRUCTION (MEMBRANE AND GRAVELSURFACED AREAS EXCEPTED).

12.2. ALL SEEDED AREAS SHALL RECEIVE VEGETATIVE MULCH.12.3. ALL SEED SHALL BE PLACED BY DRILLING.12.4. SEEDING SHALL TAKE PLACE BETWEEN OCTOBER 15 AND APRIL 15 OR AS LIMITED BY

THE CONTRACT TERMS.

A

8 10

DETAIL / SECTION NUMBER

SHEET DETAIL / SECTION

IS REFERENCED FROM

SHEET DETAIL /

SECTION IS ON

SEC. 12

SEC. 1

SEC. 2

SEC. 11

SEC. 7

R. 117W

.

R. 116W

.

SE

C. 1

SE

C. 6

x

x

x

x

x

x

FGD POND 4SOUTH ASH POND

LEGEND

GEOTECHNICAL BORING

C

O

.

R

D

.

3

0

4

(

E

L

K

O

L

R

O

A

D

)

B-10

PROPERTY BOUNDARY

NOTES:

1. ALL HORIZONTAL COORDINATES ARE IN A LOCAL GROUND

COORDINATE SYSTEM. BASED ON NAD 83 WYOMING STATE PLANE,

WEST ZONE, US FEET.

2. SURVEY BY:

CRANK COMPANIES, INC.

41 Y.S. HWY 30/189

DIAMONDVILLE, WYOMING 83116

(307) 877-9093

DATE: JUNE 2016

3. ALL GROUND ELEVATIONS ARE BASED ON NVGD29. TO CONVERT TO

NAVD88 ADD 4.56FT TO ALL ELEVATIONS.

BASE POINT OF TRANSFORM:

GROUND (LCS): E: 8,468.1795, N: 11,382.3837

GRID (WY83-WF): E: 2,486,938.333, N: 784,949.4668

TRANSFORM FROM GROUND (LCS) TO GRID (WY83-WF):

TRANSLATION: E +2,478,470.1635, N +773,567.0831 Z: +4.56

ROTATION: -0.435166667° (CW)

SCALE: 0.999610152040704 (FROM BASE POINT, X,Y ONLY)

TRANSFORM FROM GRID (WY83-WF) TO GROUND (LCS):

TRANSLATION: E -2,478,470.1635, N -773,567.0831 Z: -4.56

ROTATION: +0.435166667° (CCW)

SCALE: 1.000390000000000 (FROM BASE POINT, X,Y ONLY)

WY83-WF = WYOMING STATE PLANE, NAD83, WEST ZONE, US FT

COORDINATE TRANSFORM SUPPLIED FROM CRANK COMPANIES, INC.

EXISTING CONTOUR (MINOR)

EXISTING CONTOUR (MAJOR)

EXISTING GATE

EXISTING SNOW FENCES

UNMARKED PROPERTY LINE

UNMARKED PROPERTY LINE

PROPOSED FGD POND 5 SITE

FEET

300' 300' 600'

1"=300'

900'0

SEC. 12

R. 117W

.

x

x

x

x

x

x

x

x

x

x

x

x

x

x

x

x

x

x

xx

x

x

x x x x x x

x

x

x

x

x

x

x

A

05 04

B

05 04

C

05 04

D

05 04

E

05 04

C

O

.

R

D

.

3

0

4

(

E

L

K

O

L

R

O

A

D

)

CREST EL: 6860.5

CREST EL: 6860.5

CREST EL: 6860.5

CREST EL: 6860.5

BIRD HAZING PAD

NORTH DIVERSION .

PROPERTY BOUNDARY

SECURITY FENCE

xx

x

FIELD FENCE

BORROW AREA

NEW GATE

NEW FIELD FENCE

NEW SECURITY FENCE

BORROW AREA

18" CULVERT

NEW COUNTY ROAD APPROACH

TOPSOIL STOCKPILE

G

05 04

LEGEND

PROPOSED SUBGRADE CONTOUR (MAJOR)

PROPOSED SUBGRADE CONTOUR (MINOR)



SOUTH DIVERSION BOTTOM GRADE

TO PREVENT PONDING IN THIS AREA

SOUTH DIVERSION .

G

05 04


STAGING &

LAYDOWN

AREA

NO ENCROACHMENT ON

SHRUB WETLAND AREA

WETLAND AREA

NOTES

1. WHERE NOTED, ONE LAYER OF GEOGRID (MIRAFI BXG

110 BIAXIAL GEOGRID) WAS PLACED OVER THE

SUBGRADE IN LIEU OF COMPACTION DUE TO

SEASONAL HIGH MOISTURE CONTENT. STANDARD

EMBANKMENT FILL WAS PLACED OVER THE GEOGRID.

2. ACCESS ROAD ADDED SOUTH OF POND EMBANKMENT.

GEOGRID

GEOGRID (NOTE 1)

ACCESS ROAD (NOTE 2)

FEET

150' 150' 300'

1"=150'

450'0

6775

6800

6825

6850

6875

6900

6775

6800

6825

6850

6875

6900

0+00 5+00 10+00 15+00 20+00 25+00 27+00

6775

6800

6825

6850

6875

6900

6775

6800

6825

6850

6875

6900

0+00 5+00 10+00 15+00 20+00

6775

6800

6825

6850

6875

6900

6775

6800

6825

6850

6875

6900

0+00 5+00 10+00 15+00 20+00

6775

6800

6825

6850

6875

6900

6775

6800

6825

6850

6875

6900

0+00 5+00 10+00

6800

6825

6850

6875

6900

6800

6825

6850

6875

6900

0+00 5+00

0+00

6843.6

6842.1

6842.4

6842.6

6844.18

6842.1

6849.74

5+00

6839.5

6826.16

6839.2

6825.36

6838.2

6824.56

6836.3

6823.76

6835.3

6822.96

10+00

6834.6

6822.16

6834.1

6821.36

6832.3

6820.56

6832.1

6819.76

6831.0

6818.96

15+00

6829.5

6818.16

6828.1

6816.56

6825.9

6814.76

6823.1

6812.96

6818.8

6811.16

20+00

6814.6

6809.36

6812.9

6807.56

6811.3

6809.51

6809.4

6842.84

6805.7

6851.05

25+00

6802.7

6817.72

6801.0

0+00

6828.4

6824.8

6822.5

6826.3

6839.42

6834.2

6855.29

5+00

6844.9

6822.86

6849.3

6822.85

6847.2

6822.83

6848.5

6822.82

6847.2

6822.80

10+00

6840.9

6822.79

6835.9

6822.77

6831.8

6822.76

6828.8

6822.74

6829.3

6822.73

15+00

6825.1

6829.42

6818.4

6860.50

6813.9

6831.15

6809.7

6808.3

0+00

6806.8

6809.1

6808.0

6805.1

6805.6

5+00

6808.9

6829.21

6809.7

6859.54

6813.8

6837.35

6816.0

6811.75

6815.0

6811.72

10+00

6818.0

6811.68

6819.4

6811.65

6820.7

6811.61

6822.0

6811.58

6818.0

6811.55

15+00

6813.0

6821.83

6809.4

6855.16

6808.0

6838.75

6802.1

6806.11

6801.6

0+00

6812.2

6807.6

6803.5

6801.7

6800.0

5+00

6805.6

6809.10

6807.5

6841.84

6807.7

6852.55

6808.6

6820.63

6809.2

6808.31

0+00

6863.3

6861.7

6860.7

6859.4

6849.74

6857.4

6826.28

ELE

V:6860.50

ELE

V:6826.40

ELE

V:6805.95

ELE

V:6801.92

ELE

V:6842.62

ELE

V:6860.50

ELE

V:6860.50

ELE

V:6860.50

ELE

V:6860.50

ELE

V:6823.73

ELE

V:6822.86

ELE

V:6822.72

ELE

V:6810.46

ELE

V:6806.87

ELE

V:6811.75

ELE

V:6815.12

ELE

V:6860.50

ELE

V:6802.01

ELE

V:6860.87

ELE

V:6807.54

ELE

V:6804.93

ELE

V:6860.50

ELE

V:6860.50

ELE

V:6855.34

ELE

V:6826.52

PR

OP

ER

TY

B

ND

Y

ST

A:2+

17.59

PR

OP

ER

TY

B

ND

Y

ST

A:1+

32.83

ELE

V:6815.39

ELE

V:6815.04

ELE

V:6806.12

SECTION AA

05 04

SCALE: 1" = 100' H / 1" = 50' V

SECTION BB'B

05 04

SCALE: 1" = 100' H / 1" = 50' V

SECTION CC'C

05 04

SCALE: 1" = 100' H / 1" = 50' V

SECTION DD'D

05 04

SCALE: 1" = 100' H / 1" = 50' V

SECTION EE'E

05 04

SCALE: 1" = 100' H / 1" = 50' V

LEGEND

DESIGN SURFACE

EXISTING GROUND SURFACE

EXISTING GROUND ELEV.

SUBGRADE ELEV.


SUBGRADE ELEV.


SUBGRADE ELEV.


SUBGRADE ELEV.


SUBGRADE ELEV.

EXISTING GRADE

3

:

1

3

:

1

SUBGRADE

TYPICAL EMBANKMENT

SUBGRADE CROSS-SECTIONF

05 04

NOT TO SCALE

18.7'

POND

EXTERIOR

EMBANKMENT

10'

18.7'

VA

RIE

S

(5' M

IN

.)

3

:

1

2

:

1

3

:

1

TYPICAL DIVERSION

SUBGRADE CROSS-SECTIONG

05 04

NOT TO SCALE

POND

EMBANKMENT

FEET

100' 100' 200'

1"=100'

300'0

SEC. 12

R. 117W

.

x

x

x

x

x

x

x

x

x

x

x

x

x

x

x

x

x

x

xx

x

x

x x x x x x

x

x

x

x

x

x

x

CREST EL: 6860.5

CREST EL: 6860.5

CREST EL: 6860.5

CREST EL: 6860.5

A

07 06

B

07 06

C

07 06

D

07 06

E

07 06

BIRD HAZING PAD

C

O

.

R

D

.

3

0

4

(

E

L

K

O

L

R

O

A

D

)

NORTH DIVERSION

SOUTH DIVERSION

NEW FIELD FENCE

NEW SECURITY FENCE

BORROW AREA

TOPSOIL STOCKPILE

NOTES

1. ABRASION GUARD SHALL CONSIST OF 100-MIL HDPE GEOMEMBRANE

(TEXTURED BOTH SIDES) PLACED DIRECTLY OVER THE 60 MIL

GEOMEMBRANE. THE ABRASION GUARD SHALL BE CENTERED AT THE

PIPELINE DISCHARGE, BE 100 FT WIDE, AND EXTEND FROM THE CREST TO 40

FT BEYOND THE TOE OF THE SLOPE. THE 100-MIL HDPE SHALL BE WELDED

AT ALL SEEMS AND WELDED TO THE 60-MIL HDPE AT ALL EDGES. A DOUBLE

ROW OF PERMANENT BALLAST SHALL BE PLACED AT THE EAST AND WEST

EDGE OF THE 100-MIL HDPE BUT NOT ELSEWHERE WITHIN THE ABRASION

GUARD AREA.

2. WALKWAYS SHALL CONSIST OF A 10-FT WIDE (MINIMUM) SECTION OF FABRIC

FORMED CONCRETE. FABRIC FORMED CONCRETE SHALL BE HYDROTEX

US400 OR APPROVED EQUIVALENT (4-INCH THICK UNIFORM SECTION).

FABRIC FORMED CONCRETE SECTION SHALL BE ANCHORED IN THE

GEOMEMBRANE LINER ANCHOR TRENCH AND EXTEND 10 FT BEYOND THE

TOE OF THE SLOPE. WALKWAYS SHALL BE PLACED DIRECTLY OVER THE

60-MIL HDPE GEOMEMBRANE.

3. PERMANENT BALLAST SHALL CONSIST OF FABRIC FORMED CONCRETE

TUBES EXTENDING FROM THE CREST TO 5 FT BEYOND THE TOE OF THE

INTERIOR SLOPE PERPENDICULAR TO THE CREST. FABRIC FORMED

CONCRETE TUBES SHALL BE A MINIMUM OF 12-INCHES WIDE AND 4 INCHES

THICK (HYDROTEXT US400 OR SIMILAR). PERMANENT BALLAST SHALL BE

ANCHORED IN THE GEOMEMBRANE ANCHOR TRENCH. PERMANENT BALLAST

TUBES SHALL BE PLACED ON A 25 FT HORIZONTAL SPACINGS, MEASURED AT

THE CREST, OVER THE ENTIRE INTERIOR SLOPE OF THE POND . PERMANENT

BALLAST TUBES SHALL BE PLACED DIRECTLY OVER THE 60-MIL HDPE

GEOMEMBRANE.

4. CONCRETE FOR WALKWAYS AND PERMANENT BALLAST SHALL BE PUMPED

FROM THE CREST OF THE EMBANKMENT. THE CONCRETE MIX SHALL

CONSIST OF FINE AGGREGATE CONCRETE WITH 4 TO 7% AIR CONTENT AND A

MINIMUM 28-DAY COMPRESSIVE STRENGTH OF 4,000 PSI. ALL OTHER

CONCRETE PROPERTIES SHALL BE CONSISTENT WITH FABRIC FORMED

CONCRETE MANUFACTURERS REQUIREMENTS.

5. TEMPORARY BALLAST SHALL BE PLACED OVER THE ENTIRE POND BOTTOM

AREA OVER THE 60-MIL HDPE GEOMEMBRANE. TEMPORARY BALLAST SHALL

CONSIST OF SAND BAGS (40 LB MINIMUM) PLACED OVER THE GEOMEMBRANE

ON A MAXIMUM 20 FT GRID PATTERN. BAG MATERIAL FOR TEMPORARY

BALLAST SHALL PROVIDE UV RESISTANCE OF 1-YEAR.

PROPERTY BOUNDARY

SECURITY FENCExx

xFIELD FENCE

BORROW AREA

LEGEND

PROPOSED FINAL GRADE CONTOUR (MAJOR)

PROPOSED FINAL GRADE CONTOUR (MINOR)



WALKWAY

SEE NOTE 2

NEW GATE

18" CULVERT

NEW COUNTY ROAD APPROACH


NEW PIPELINE (SURVEYED)

STAGING &

LAYDOWN

AREA

GEOGRID

ACCESS ROAD

GEOGRID

NEW PIPELINE (NOT SURVEYED)

FEET

150' 150' 300'

1"=150'

450'0

6775

6800

6825

6850

6875

6900

6775

6800

6825

6850

6875

6900

0+00 5+00 10+00 15+00 20+00 25+00 27+00

6775

6800

6825

6850

6875

6900

6775

6800

6825

6850

6875

6900

0+00 5+00 10+00 15+00 20+00

6775

6800

6825

6850

6875

6900

6775

6800

6825

6850

6875

6900

0+00 5+00 10+00 15+00 20+00

6775

6800

6825

6850

6875

6900

6775

6800

6825

6850

6875

6900

0+00 5+00 10+00

6800

6825

6850

6875

6900

6800

6825

6850

6875

6900

0+00 5+00

0+00

6843.6

6842.1

6842.4

6842.6

6844.18

6842.1

6851.84

5+00

6839.5

6828.16

6839.2

6827.36

6838.2

6826.56

6836.3

6825.76

6835.3

6824.96

10+00

6834.6

6824.16

6834.1

6823.36

6832.3

6822.56

6832.1

6821.76

6831.0

6820.96

15+00

6829.5

6820.16

6828.1

6818.56

6825.9

6816.76

6823.1

6814.96

6818.8

6813.16

20+00

6814.6

6811.36

6812.9

6809.56

6811.3

6811.61

6809.4

6844.95

6805.7

6851.05

25+00

6802.7

6817.72

6801.0

0+00

6828.4

6824.8

6822.5

6826.3

6839.42

6834.2

6857.39

5+00

6844.9

6824.87

6849.3

6824.85

6847.2

6824.83

6848.5

6824.82

6847.2

6824.80

10+00

6840.9

6824.79

6835.9

6824.77

6831.8

6824.76

6828.8

6824.74

6829.3

6824.73

15+00

6825.1

6831.53

6818.4

6860.50

6813.9

6831.15

6809.7

6808.3

0+00

6806.8

6809.1

6808.0

6805.1

6805.6

5+00

6808.9

6829.21

6809.7

6859.54

6813.8

6839.46

6816.0

6813.75

6815.0

6813.72

10+00

6818.0

6813.68

6819.4

6813.65

6820.7

6813.61

6822.0

6813.58

6818.0

6813.55

15+00

6813.0

6823.94

6809.4

6857.26

6808.0

6838.75

6802.1

6806.11

6801.6

0+00

6812.2

6807.6

6803.5

6801.7

6800.0

5+00

6805.6

6809.10

6807.5

6841.84

6807.7

6854.83

6808.6

6822.82

6809.2

6810.31

0+00

6863.3

6861.7

6860.7

6859.4

6851.84

6857.4

6828.28

ELE

V:6860.50

ELE

V:6860.50

ELE

V:6860.50

ELE

V:6860.50

ELE

V:6842.62

ELE

V:6828.40

ELE

V:6814.49

ELE

V:6860.50

ELE

V:6801.92

ELE

V:6860.50

ELE

V:6823.73

ELE

V:6824.86

ELE

V:6824.72

ELE

V:6860.50

ELE

V:6810.45

ELE

V:6806.89

ELE

V:6813.75

ELE

V:6813.52

ELE

V:6860.50

ELE

V:6802.01

ELE

V:6804.93

ELE

V:6809.55

ELE

V:6855.34

ELE

V:6860.87

ELE

V:6828.52

PR

OP

ER

TY

B

ND

Y

ST

A:1+

32.83

PR

OP

ER

TY

B

ND

Y

ST

A:2+

17.59

ELE

V:6815.04

ELE

V:6806.13

SECTION AA

07 06

SCALE: 1" = 100' H / 1" = 50' V

SECTION BB'B

07 06

SCALE: 1" = 100' H / 1" = 50' V

SECTION CC'C

07 06

SCALE: 1" = 100' H / 1" = 50' V

SECTION DD'D

07 06

SCALE: 1" = 100' H / 1" = 50' V

SECTION EE'E

07 06

SCALE: 1" = 100' H / 1" = 50' V

LEGEND

DESIGN SURFACE

EXISTING GROUND SURFACE


FINAL GRADE ELEV.


FINAL GRADE ELEV.


FINAL GRADE ELEV.


FINAL GRADE ELEV.


FINAL GRADE ELEV.

60-mil HDPE

GEOMEMBRANE LINER

EXISTING GRADE

SUBGRADE

3

:

1

3

:

1

COMPACTED CLAY LINER

(24-INCHES THICK)

TYPICAL EMBANKMENT

AND LINER CROSS-SECTION F

07 06

NOT TO SCALE

25'

EL 6860.5

POND

B

08 06

LINER ANCHOR

FEET

100' 100' 200'

1"=100'

300'0

CROSS-SECTION: PIPELINE TRENCHC

8

SCALE: NTS

10

PLAN: CLEANOUTD

10

SCALE: NTS

10

E

10 10

F

10 10

F

10 10

CROSS-SECTION: CLEANOUTF

8

SCALE: NTS

10

CROSS-SECTION: CLEANOUTE

10

SCALE: NTS

10

CROSS-SECTION: LINER ANCHOR (TYPICAL)B

8

SCALE: NTS

6

CROSS-SECTION: PIPE PENETRATIONA

8

SCALE: NTS

10

ALTERNATIVE CROSS-SECTION:

WHERE AIR RELEASE VALVE IS SPECIFIEDF-A

8

SCALE: NTS

10

F

10 10

ALTERNATIVE CROSS-SECTION:

WHERE AIR RELEASE VALVE IS SPECIFIEDE-A

10

SCALE: NTS

10

FEET

150' 150' 300'

1"=150'

450'0

PLAN: CONNECTION TO EXISTING

EFFLUENT DELIVERY PIPELINESA

11

SCALE: NTS

11

B

11 11

C

11 11

D

11 11

F

11 11

E

11 11

PLAN: VAULTB

11

SCALE: NTS

11

SECTION FF

11

SCALE: NTS

11

SECTION EE

11

SCALE: NTS

11

SECTION DD

11

SCALE: NTS

11

SECTION CC

11

SCALE: NTS

11

257.74(e) naughtonfgd5 safety factor assessment...257.74(e) safety factor assessment fgd pond 5...

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