CCR Rule Siting Criteria Seismic Impact Zones

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1 CCR Rule Siting Criteria Seismic Impact Zones FGD Pond 5 Naughton Power Plant Kemmerer, Wyoming October 30, 2017 PREPARED FOR PacifiCorp 1407 West North Temple Salt Lake City, UT (801) Fax (801) PREPARED BY Tetra Tech 1551 Three Crowns Drive Suite 210 Casper, Wyoming

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.

2 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 seismic impact zone assessment provided herein meets the requirements of 40 Code of Federal Regulations October 30, 2017 Jason M. Stratton, P.E. Date

3 Siting Criteria Seismic Impact Zones PacifiCorp Naughton Power Plant FGD Pond 5 TABLE OF CONTENTS PROFESSIONAL ENGINEER CERTIFICATION...II 1.0 INTRODUCTION EXISTING CONDITIONS SITE SEISMIC CONDITIONS AND EVALUATION CONCLUSIONS...2 SOURCE(S)...2 REVISIONS...3 FIGURES Figure 1. Site Vicinity...4 Figure Seismic Acceleration Deaggregation...5 i October 30, 2017

4 Siting Criteria Seismic Impact Zones PacifiCorp Naughton Power Plant FGD Pond INTRODUCTION The PacifiCorp Naughton Power Plant is located approximately three miles southwest of Kemmerer, Wyoming. This report addresses the requirements of Seismic Impact Zones, as it pertains to FGD Pond 5 at the Plant. FGD Pond 5 was constructed in This report presents the initial evaluation immediately following completion of construction and prior to the pond being placed into service. Specifically, (a) states: New CCR landfills, existing and new CCR surface impoundments, and all lateral expansions of CCR units must not be located in seismic impact zones unless the owner or operator demonstrates by the dates specified in paragraph (c) of this section that all structural components including liners, leachate collection and removal systems, and surface water control systems, are designed to resist the maximum horizontal acceleration in lithified earth material for the site. The definition for a seismic impact zone per Definitions is: Seismic impact zone means an area having a 2% or greater probability that the maximum expected horizontal acceleration, expressed as a percentage of the earth s gravitational pull (g), will exceed 0.10g in 50 years. 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). October 30, 2017

5 Siting Criteria Seismic Impact Zones PacifiCorp Naughton Power Plant FGD Pond SITE SEISMIC CONDITIONS AND EVALUATION The U.S. Geological Survey (USGS) National Seismic Hazard Mapping Program (NSHMP) Interactive Deaggregation website was used to provide the design ground acceleration relating to the design seismic event, which at the FGD Pond 5 site for the above return period is 0.169g, for a site on rock with an average shear wave velocity of 760 m/s in the top 30 m (Figure 3.4-1). Therefore, the pond is located within a seismic impact zone. The structural stability of the pond, embankments, and liner sections have been analyzed under this seismic loading as presented in the Periodic Safety Factor Assessment report [2] which has demonstrated these items are resistant to the maximum horizontal acceleration as required. There are no other structural components which require analysis. 4.0 CONCLUSIONS FGD Pond 5 meets the requirements of Seismic Impact Zones. SOURCE(S) [1] USEPA, CFR Parts 257 and 261, Hazardous and Solid Waste Management System; Disposal of Coal Combustion Residuals from Electric Utilities; Final Rule. April 17, pp. [2] Tetra Tech. CCR Rule Design Criteria, (e) Periodic Safety Factor Assessment, pp. October 30, 2017

6 Siting Criteria Seismic Impact Zones PacifiCorp Naughton Power Plant FGD Pond 5 REVISIONS Revision Number Date Revision Made By Whom 0 10/30/2017 Initial Issue Tetra Tech October 30, 2017

7 MONTANA POWELL LOVELL SHEDIDAN NEW EFFLUENT PIPELINE SEC. 1 SEC. 6 IDAHO CODY GREYBULL SUNDANCE BUFFALO GILLETTE BASIN MOORCROFT WORLAND TEN SLEEP MORAN NEWCASTLE THERMOPOLIS DUBOIS LINCH JACKSON MIDWEST SHOSHONI LANCE CREEK FORT WASHAKIE EVANSVILLE PINEDALE RIVERTON GLENROCK LUSK LANDER CASPER AFTON DOUGLAS BIG PINEY SUNRISE TORRINGTON SOUTH DAKOTA NEBRASKA KEMMERER EDEN HANNA MEDICINE BOW WHEATLAND GREEN RIVER RAWLINS MOUNTAIN LYMAN VIEW EVANSTON ROCK SPRINGS SARATOGA LARAMIE ORCHARD VALLEY CHEYENNE UTAH KEY MAP COLORADO R:\N-S\PacifiCorp\ Naughton FGD Pond\110-2D CADD\SheetFiles\01-Vicinity Map.dwg SAVED:1/12/17 PRINTED:1/12/17 BY:MARK.COOK NEW FGD POND 5 ACCESS ROAD Three Crowns Drive, Suite 210 Casper, WY NEW FGD EFFLUENT DISPOSAL POND 5 3 SEC 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. 4 5 CO. RD. 304 (ELKOL ROAD) Point # POINT COORDINATES 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' All point coordinates are in the NAD83 Wyoming State Planes, West Zone, US Foot datum. 0 Feet 500 January 12, 2017 FIGURE 1 FGD EFFLUENT DISPOSAL POND 5 NAUGHTON POWER PLANT KEMMERER, WYOMING SITE VICINITY

$R:\N-S\PacifiCorp\114-510835 - Naughton FGD Pond\110-2D CADD\SheetFiles\03.4-1 Deaggregation Figure.dwg SAVED:1/12/17 PRINTED:1/13/17 BY:MARK.COOK Source: http://geohazards.usgs.$ 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.

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.

8 R:\N-S\PacifiCorp\ Naughton FGD Pond\110-2D CADD\SheetFiles\ Deaggregation Figure.dwg SAVED:1/12/17 PRINTED:1/13/17 BY:MARK.COOK Source: 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. January Three Crowns Drive, Suite 210 Casper, WY FIGURE FGD EFFLUENT DISPOSAL POND 5 NAUGHTON POWER PLANT KEMMERER, WYOMING SEISMIC ACCELERATION DEAGGREGATION

9 *** Deaggregation of Seismic Hazard at One Period of Spectral Accel. *** *** Data from U.S.G.S. National Seismic Hazards Mapping Project, 2008 version *** PSHA Deaggregation. % Contributions. Site: FGD_Pond_5 long: d W., lat: N. Input Vs30 (m/s) = (some WUS atten. models use Site Class not Vs30). NSHMP update. See USGS OFR Analysis on DaMoYr:12/01/2017 Mean Return Period: 2475 years s. PSA = g. Weight * Computed_Rate_Ex 0.408E-03 #Pr[at least one eq with median motion>=psa in 50 yrs]= #This deaggregation corresponds to Mean Hazard w/all GMPEs DIST(km) MAG(Mw) ALL_EPS EPSILON>2 1<EPS<2 0<EPS<1-1<EPS<0-2<EPS<-1 EPS< Page 1

10 Summary statistics for above 1.0s PSA deaggregation, R=distance, e=epsilon: Contribution from this GMPE(%): Mean src-site R= 27.5 km; M= 6.79; eps0= Mean calculated for all sources. Modal src-site R= 20.9 km; M= 6.84; eps0= 1.06 from peak (R,M) bin MODE R*= 20.9km; M*= 6.84; EPS.INTERVAL: 1 to 2 sigma % CONTRIB.= Principal sources (faults, subduction, random seismicity having > 3% contribution) Source Category: % contr. R(km) M epsilon0 (mean values). Basin & Range M>6.5 Char Basin & Range M>6.5 GR Extensional Zones gridded CEUS gridded Individual fault hazard details if its contribution to mean hazard > 2%: Fault ID % contr. Rcd(km) M epsilon0 Site-to-src azimuth(d) Rock Creek f. 50d dip. Char Rock Creek f. 40d dip. Char Rock Creek f. 60d dip. Char Rock Creek fault GR. Dip Rock Creek fault GR Rock Creek fault GR. Dip 60 d #*********End of deaggregation corresponding to Mean Hazard w/all GMPEs *********# PSHA Deaggregation. % Contributions. Site: FGD_Pond_5 long: d W., lat: N. Input Vs30 (m/s) = (some WUS atten. models use Site Class not Vs30). NSHMP update. See USGS OFR Analysis on DaMoYr:12/01/2017 Mean Return Period: 2475 years s. PSA = g. Weight * Computed_Rate_Ex 0.151E-04 #Pr[at least one eq with median motion>=psa in 50 yrs]= #This deaggregation corresponds to Toro et al DIST(km) MAG(Mw) ALL_EPS EPSILON>2 1<EPS<2 0<EPS<1-1<EPS<0-2<EPS<-1 EPS< Page 2

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13 Summary statistics for above 1.0s PSA deaggregation, R=distance, e=epsilon: Contribution from this GMPE(%): 3.7 Mean src-site R= 65.3 km; M= 6.38; eps0= Mean calculated for all sources. Modal src-site R= km; M= 6.78; eps0= 1.58 from peak (R,M) bin MODE R*= 123.2km; M*= 6.78; EPS.INTERVAL: 1 to 2 sigma % CONTRIB.= Principal sources (faults, subduction, random seismicity having > 3% contribution) Source Category: % contr. R(km) M epsilon0 (mean values). CEUS gridded Individual fault hazard details if its contribution to mean hazard > 2%: Fault ID % contr. Rcd(km) M epsilon0 Site-to-src azimuth(d) Rock Creek f. 50d dip. Char Rock Creek f. 40d dip. Char Rock Creek f. 60d dip. Char Rock Creek fault GR. Dip Rock Creek fault GR Rock Creek fault GR. Dip 60 d #*********End of deaggregation corresponding to Toro et al *********# PSHA Deaggregation. % Contributions. Site: FGD_Pond_5 long: d W., lat: N. Input Vs30 (m/s) = (some WUS atten. models use Site Class not Vs30). NSHMP update. See USGS OFR Analysis on DaMoYr:12/01/2017 Mean Return Period: 2475 years s. PSA = g. Weight * Computed_Rate_Ex 0.915E-05 #Pr[at least one eq with median motion>=psa in 50 yrs]= #This deaggregation corresponds to Frankel et al., 1996 DIST(km) MAG(Mw) ALL_EPS EPSILON>2 1<EPS<2 0<EPS<1-1<EPS<0-2<EPS<-1 EPS< Page 5

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15 Summary statistics for above 1.0s PSA deaggregation, R=distance, e=epsilon: Contribution from this GMPE(%): 2.2 Mean src-site R= 92.7 km; M= 6.47; eps0= Mean calculated for all sources. Modal src-site R= km; M= 6.78; eps0= 1.31 from peak (R,M) bin MODE R*= 124.8km; M*= 6.78; EPS.INTERVAL: 1 to 2 sigma % CONTRIB.= Principal sources (faults, subduction, random seismicity having > 3% contribution) Source Category: % contr. R(km) M epsilon0 (mean values). Individual fault hazard details if its contribution to mean hazard > 2%: Fault ID % contr. Rcd(km) M epsilon0 Site-to-src azimuth(d) Rock Creek f. 50d dip. Char Rock Creek f. 40d dip. Char Rock Creek f. 60d dip. Char Rock Creek fault GR. Dip Rock Creek fault GR Rock Creek fault GR. Dip 60 d #*********End of deaggregation corresponding to Frankel et al., 1996 *********# PSHA Deaggregation. % Contributions. Site: FGD_Pond_5 long: d W., lat: N. Input Vs30 (m/s) = (some WUS atten. models use Site Class not Vs30). NSHMP update. See USGS OFR Analysis on DaMoYr:12/01/2017 Mean Return Period: 2475 years s. PSA = g. Weight * Computed_Rate_Ex 0.479E-05 #Pr[at least one eq with median motion>=psa in 50 yrs]= #This deaggregation corresponds to Tavakoli and Pezeshk 05 DIST(km) MAG(Mw) ALL_EPS EPSILON>2 1<EPS<2 0<EPS<1-1<EPS<0-2<EPS<-1 EPS< Page 7

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17 Summary statistics for above 1.0s PSA deaggregation, R=distance, e=epsilon: Contribution from this GMPE(%): 1.2 Mean src-site R= 36.8 km; M= 6.31; eps0= Mean calculated for all sources. Modal src-site R= 15.0 km; M= 6.21; eps0= from peak (R,M) bin MODE R*= 14.9km; M*= 6.42; EPS.INTERVAL: 1 to 2 sigma % CONTRIB.= Principal sources (faults, subduction, random seismicity having > 3% contribution) Source Category: % contr. R(km) M epsilon0 (mean values). Individual fault hazard details if its contribution to mean hazard > 2%: Fault ID % contr. Rcd(km) M epsilon0 Site-to-src azimuth(d) Rock Creek f. 50d dip. Char Rock Creek f. 40d dip. Char Rock Creek f. 60d dip. Char Rock Creek fault GR. Dip Rock Creek fault GR Rock Creek fault GR. Dip 60 d #*********End of deaggregation corresponding to Tavakoli and Pezeshk 05 *********# PSHA Deaggregation. % Contributions. Site: FGD_Pond_5 long: d W., lat: N. Input Vs30 (m/s) = (some WUS atten. models use Site Class not Vs30). NSHMP update. See USGS OFR Analysis on DaMoYr:12/01/2017 Mean Return Period: 2475 years s. PSA = g. Weight * Computed_Rate_Ex 0.996E-04 Page 9

18 #Pr[at least one eq with median motion>=psa in 50 yrs]= #This deaggregation corresponds to Boore-Atkinson 2008 DIST(km) MAG(Mw) ALL_EPS EPSILON>2 1<EPS<2 0<EPS<1-1<EPS<0-2<EPS<-1 EPS< Page 10

19 Summary statistics for above 1.0s PSA deaggregation, R=distance, e=epsilon: Contribution from this GMPE(%): 24.4 Mean src-site R= 25.5 km; M= 6.83; eps0= Mean calculated for all sources. Modal src-site R= 20.9 km; M= 6.84; eps0= 1.20 from peak (R,M) bin MODE R*= 20.9km; M*= 6.84; EPS.INTERVAL: 1 to 2 sigma % CONTRIB.= Principal sources (faults, subduction, random seismicity having > 3% contribution) Source Category: % contr. R(km) M epsilon0 (mean values). Basin & Range M>6.5 Char Basin & Range M>6.5 GR Extensional Zones gridded Individual fault hazard details if its contribution to mean hazard > 2%: Fault ID % contr. Rcd(km) M epsilon0 Site-to-src azimuth(d) Rock Creek f. 50d dip. Char Rock Creek f. 40d dip. Char Rock Creek f. 60d dip. Char Rock Creek fault GR. Dip Rock Creek fault GR Rock Creek fault GR. Dip 60 d #*********End of deaggregation corresponding to Boore-Atkinson 2008 *********# PSHA Deaggregation. % Contributions. Site: FGD_Pond_5 long: d W., lat: N. Input Vs30 (m/s) = (some WUS atten. models use Site Class not Vs30). NSHMP update. See USGS OFR Analysis on DaMoYr:12/01/2017 Mean Return Period: 2475 years s. PSA = g. Weight * Computed_Rate_Ex 0.157E-03 #Pr[at least one eq with median motion>=psa in 50 yrs]= #This deaggregation corresponds to Campbell-Bozorgnia 2008 DIST(km) MAG(Mw) ALL_EPS EPSILON>2 1<EPS<2 0<EPS<1-1<EPS<0-2<EPS<-1 EPS< Page 11

20 Summary statistics for above 1.0s PSA deaggregation, R=distance, e=epsilon: Contribution from this GMPE(%): 38.6 Mean src-site R= 24.8 km; M= 6.84; eps0= Mean calculated for all sources. Modal src-site R= 20.9 km; M= 6.84; eps0= 0.93 from peak (R,M) bin MODE R*= 20.9km; M*= 6.84; EPS.INTERVAL: 1 to 2 sigma % CONTRIB.= Principal sources (faults, subduction, random seismicity having > 3% contribution) Source Category: % contr. R(km) M epsilon0 (mean values). Basin & Range M>6.5 Char Basin & Range M>6.5 GR Extensional Zones gridded Individual fault hazard details if its contribution to mean hazard > 2%: Fault ID % contr. Rcd(km) M epsilon0 Site-to-src azimuth(d) Rock Creek f. 50d dip. Char Rock Creek f. 40d dip. Char Rock Creek f. 60d dip. Char Rock Creek fault GR. Dip Rock Creek fault GR Rock Creek fault GR. Dip 60 d #*********End of deaggregation corresponding to Campbell-Bozorgnia 2008 *********# PSHA Deaggregation. % Contributions. Site: FGD_Pond_5 long: d W., lat: N. Input Vs30 (m/s) = (some WUS atten. models use Site Class not Vs30). NSHMP update. See USGS OFR Analysis on DaMoYr:12/01/2017 Mean Return Period: 2475 years s. PSA = g. Weight * Computed_Rate_Ex 0.113E-03 #Pr[at least one eq with median motion>=psa in 50 yrs]= #This deaggregation corresponds to Chiou-Youngs 2008 DIST(km) MAG(Mw) ALL_EPS EPSILON>2 1<EPS<2 0<EPS<1-1<EPS<0-2<EPS<-1 EPS< Page 12

21 Summary statistics for above 1.0s PSA deaggregation, R=distance, e=epsilon: Contribution from this GMPE(%): 27.7 Mean src-site R= 21.6 km; M= 6.80; eps0= Mean calculated for all sources. Modal src-site R= 20.9 km; M= 6.84; eps0= 1.12 from peak (R,M) bin MODE R*= 20.8km; M*= 6.84; EPS.INTERVAL: 1 to 2 sigma % CONTRIB.= Principal sources (faults, subduction, random seismicity having > 3% contribution) Source Category: % contr. R(km) M epsilon0 (mean values). Basin & Range M>6.5 Char Basin & Range M>6.5 GR Extensional Zones gridded Individual fault hazard details if its contribution to mean hazard > 2%: Fault ID % contr. Rcd(km) M epsilon0 Site-to-src azimuth(d) Rock Creek f. 50d dip. Char Rock Creek f. 40d dip. Char Rock Creek f. 60d dip. Char Page 13

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