CCR Rule Siting Criteria Fault Areas

Transcription

1 CCR Rule Siting Criteria Fault Areas 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

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 Fault Areas assessment provided herein meets the requirements of 40 Code of Federal Regulations October 30, 2017 Jason M. Stratton, P.E. Date

3 Siting Criteria Fault Areas PacifiCorp Naughton Power Plant FGD Pond 5 TABLE OF CONTENTS PROFESSIONAL ENGINEER CERTIFICATION...II 1.0 INTRODUCTION EXISTING CONDITIONS FAULT EVALUATION CONCLUSIONS...2 SOURCE(S)...2 REVISIONS...3 FIGURES Figure 1. Site Vicinity...4 Figure Earthquake Fault Map...5 i October 30, 2017

4 Siting Criteria Fault Areas 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 Fault Areas, 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, indicates The pond must be located a minimum of 200 ft from the outermost damage zone of a fault that has had displacement in the Holocene time. 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). 3.0 FAULT EVALUATION Quaternary fault mapping by the USGS ( indicates the nearest Holocene aged fault system is the Rock Creek fault. The Rock Creek fault is a north-striking, high-angle, down-to-the-west normal fault within the Tunp Range. The fault is located approximately 12 mi west of the project site, near Fossil Butte National Monument (Figure Earthquake Fault Map). Scarps are present within steep colluvial slopes along much of the length of this fault. Morphologic studies of the scarps indicate the most recent event occurred in the late Holocene. Recurrence intervals are estimated to be 3,000 to 15,000 years with a slip rate of up to 1mm per year. October 30, 2017

5 Siting Criteria Fault Areas PacifiCorp Naughton Power Plant FGD Pond CONCLUSIONS FGD Pond 5 meets the requirements of Fault Areas. 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. October 30, 2017

6 Siting Criteria Fault Areas 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

8 SAVED:1/12/17 PRINTED: 1/12/17 BY:MARK.COOK R:\N-S\PacifiCorp\ Naughton FGD Pond\110-2D CADD\SheetFiles\ Fault Mapdwg.dwg ' Three Crowns Drive, Suite 210 Casper, WY 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. FAULT LINE LOCATIONS ARE BASED ON GIS DATA OBTAINED FROM USGS DATA SOURCE: GENERAL NOTES: 1. 9 ROCK CREEK FAULT 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' 2,420,843.82' Northing 780,840.84' 780,705.88' 780,313.29' 779,532.25' 779,251.20' 779,298.33' 779,615.00' 795,321.59' 0 1 Feet January 12, TR 78 FIGURE FGD EFFLUENT DISPOSAL POND 5 NAUGHTON POWER PLANT KEMMERER, WYOMING EARTHQUAKE FAULT MAP FGD POND 5 SITE All point coordinates are in the NAD83 Wyoming State Planes, West Zone, US Foot datum ,549.81' POINT COORDINATES Point #