CCR Rule Siting Criteria Unstable Areas

Transcription

1 CCR Rule Siting Criteria Unstable Areas FGD Pond 5 Naughton Power Plant Kemmerer, Wyoming October 3, 217 PREPARED FOR PacifiCorp 147 West North Temple Salt Lake City, UT (81) Fax (81) PREPARED BY Tetra Tech 1551 Three Crowns Drive Suite 2 Casper, Wyoming 82648

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 Unstable Areas assessment provided herein meets the requirements of 4 Code of Federal Regulations October 3, 217 Jason M. Stratton, P.E. Date

3 Siting Criteria Unstable Areas PacifiCorp Naughton Power Plant FGD Pond 5 TABLE OF CONTENTS PROFESSIONAL ENGINEER CERTIFICATION...II 1. INTRODUCTION EXISTING CONDITIONS UNSTABLE AREAS EVALUATION CONCLUSIONS...2 SOURCE(S)...2 REVISIONS...3 FIGURES Figure 1. Site Vicinity...4 APPENDICES Appendix B.... GEOTECHNICAL STUDY i October 3, 217

4 Siting Criteria Unstable Areas PacifiCorp Naughton Power Plant FGD Pond 5 1. INTRODUCTION The PacifiCorp Naughton Power Plant is located approximately three miles southwest of Kemmerer, Wyoming. This report addresses the requirements of Unstable Areas, as it pertains to FGD Pond 5 at the Plant. FGD Pond 5 was constructed in 217. 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 not be located within unstable areas defines an unstable area as a location that is susceptible to natural or human-induced events or forces capable of impairing the integrity, including structural components, of some or all of the CCR unit that are responsible for preventing releases from such unit. Unstable areas can include poor foundation conditions, areas susceptible to mass movements, and karst terrains. 2. 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, 21 MW, and 33 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 217 at the location shown on Figure 1. The pond has a permitted capacity of 1,467 acre-ft which is expected to provide approximately 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 6-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 -7 cm/sec (lower component). 3. UNSTABLE AREAS EVALUATION The site is underlain by a thin veneer of stiff clay overlying claystone bedrock (Appendix B). These materials are not susceptible to excessive deformation or mass movement and provide adequate stability for the pond foundation. No karst or other unstable features are present at this site.. October 3, 217

5 Siting Criteria Unstable Areas PacifiCorp Naughton Power Plant FGD Pond 5 4. CONCLUSIONS FGD Pond 5 meets the requirements of Unstable 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 3, 217

6 Siting Criteria Unstable Areas PacifiCorp Naughton Power Plant FGD Pond 5 REVISIONS Revision Number Date Revision Made By Whom /3/217 Initial Issue Tetra Tech October 3, 217

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\1-2D CADD\SheetFiles\1-Vicinity Map.dwg SAVED:1/12/17 PRINTED:1/12/17 BY:MARK.COOK NEW FGD POND 5 ACCESS ROAD Three Crowns Drive, Suite 2 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. 34 (ELKOL ROAD) Point # POINT COORDINATES Northing 78,549.81' 78,84.84' 78,75.88' 78,313.29' 779,532.25' 779,251.2' 779,298.33' 779,615.' Easting 2,485,79.83' 2,485,938.61' 2,486,941.83' 2,487,845.6' 2,487,921.4' 2,487,426.65' 2,485,988.22' 2,485,679.7' All point coordinates are in the NAD83 Wyoming State Planes, West Zone, US Foot datum. Feet January 12, 217 FIGURE 1 FGD EFFLUENT DISPOSAL POND 5 NAUGHTON POWER PLANT KEMMERER, WYOMING SITE VICINITY

8 FGD Effluent Disposal Pond 5 PacifiCorp Naughton Power Plant APPENDIX B GEOTECHNICAL STUDY November, 216

9 R:\N-S\PacifiCorp\ Naughton FGD Pond\1-2D CADD\SheetFiles\1-Vicinity Map.dwg SAVED:11/15/16 PRINTED:11/15/16 BY:MARK.COOK NEW EFFLUENT PIPELINE NEW FGD POND 5 ACCESS ROAD NEW FGD EFFLUENT DISPOSAL POND 5 SEC. 12 CO. RD. 34 (ELKOL ROAD) 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. November 15, West 2 South, Ste 4 Salt Lake City, UT 8412 PHONE: (81) FAX: (81) FIGURE 1 FGD EFFLUENT DISPOSAL POND 5 NAUGHTON POWER PLANT, KEMMERER, WYOMING SITE VICINITY

10 R:\N-S\PacifiCorp\ Naughton FGD Pond\1-2D CADD\SheetFiles\2-Locations of Exploration Borings.dwg SAVED:11/15/16 PRINTED:11/15/16 BY:MARK.COOK SEC. 2 LEGEND EXISTING CONTOUR (MAJOR) EXISTING CONTOUR (MINOR) PROPERTY BOUNDARY GEOTECHNICAL BORING UNMARKED PROPERTY LINE PROPOSED FGD POND 5 SITE SEC. 11 EXISTING GATE EXISTING SNOW FENCES SEC. 12 UNMARKED PROPERTY LINE 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 West 2 South, Ste 4 Salt Lake City, UT 8412 PHONE: (81) FAX: (81) Feet 6 November 15, 216 FIGURE 2 FGD EFFLUENT DISPOSAL POND 5 NAUGHTON POWER PLANT, KEMMERER, WYOMING LOCATIONS OF EXPLORATORY BORINGS

11 USCS Description Depth (ft) Symbol Sample Type SPT Blows Per 6 Inches SPT - N Dry Density (pcf) TEST RESULTS Pocket Penetrometer, TSF SPT, N-Value % Passing No. 2 Sieve PL MC LL Note: BGS = Below Ground Surface TOPSOIL, (6 inches thick). CLAYSTONE BEDROCK, medium hard to very hard, brown to dark gray, slightly moist to wet STRATA BOREHOLE - STRATA.GDT - 11/9/16 14:46 - V:\STRATA - CASPER PROJECTS\T-Z\TETRA TECH, INC\WY1634A - FGD POND 5 - GT DRILLING\GEO\GINT LOGS\WY1634A LOGS.GPJ /6." /5." Project Name: FGD Pond 5 - Naughton Power Plant - Kemmerer, Wyoming Project Number: WY1634A Client: Tetra Tech, Inc. Date Drilled: 6/14/216 Drill Rig: CME 55 Borehole Dia.: 4" SSA Groundwater Depth: 47.5' Drilled By: STRATA Logged By: M. Medley (Continued Next Page) BORING LOG B-1 Sheet 1 Of 2

12 USCS Description Depth (ft) Symbol Sample Type SPT Blows Per 6 Inches SPT - N Dry Density (pcf) TEST RESULTS Pocket Penetrometer, TSF SPT, N-Value % Passing No. 2 Sieve PL MC LL Note: BGS = Below Ground Surface CLAYSTONE BEDROCK, medium hard to very hard, brown to dark gray, slightly moist to wet. (continued) 35 /4." STRATA BOREHOLE - STRATA.GDT - 11/9/16 14:46 - V:\STRATA - CASPER PROJECTS\T-Z\TETRA TECH, INC\WY1634A - FGD POND 5 - GT DRILLING\GEO\GINT LOGS\WY1634A LOGS.GPJ 4 45 /5." /6." /6." Borehole Terminated at.5 Feet. Project Name: FGD Pond 5 - Naughton Power Plant - Kemmerer, Wyoming Project Number: WY1634A Client: Tetra Tech, Inc. Date Drilled: 6/14/216 Drill Rig: CME 55 Borehole Dia.: 4" SSA Groundwater Depth: 47.5' Drilled By: STRATA Logged By: M. Medley BORING LOG B-1 Sheet 2 Of 2

13 USCS Description TOPSOIL, (6 inches thick). (CL) Sandy LEAN CLAY, stiff, brown, slightly moist. Depth (ft) CLAYSTONE BEDROCK, medium hard to very hard, brown to dark gray, slightly moist to wet. Symbol CL Sample Type SPT Blows Per 6 Inches SPT - N Dry Density (pcf) 114 Pocket Penetrometer, TSF % Passing No. 2 Sieve PL MC LL TEST RESULTS SPT, N-Value Note: BGS = Below Ground Surface STRATA BOREHOLE - STRATA.GDT - 11/9/16 14:46 - V:\STRATA - CASPER PROJECTS\T-Z\TETRA TECH, INC\WY1634A - FGD POND 5 - GT DRILLING\GEO\GINT LOGS\WY1634A LOGS.GPJ /6." Project Name: FGD Pond 5 - Naughton Power Plant - Kemmerer, Wyoming Project Number: WY1634A Date Drilled: 6/15/216 Groundwater Depth: 36' Client: Tetra Tech, Inc Drill Rig: CME 55 Drilled By: STRATA Borehole Dia.: 4" SSA Logged By: M. Medley (Continued Next Page) BORING LOG B-2 Sheet 1 Of 2

14 USCS Description Depth (ft) Symbol Sample Type SPT Blows Per 6 Inches SPT - N Dry Density (pcf) TEST RESULTS Pocket Penetrometer, TSF SPT, N-Value % Passing No. 2 Sieve PL MC LL Note: BGS = Below Ground Surface CLAYSTONE BEDROCK, medium hard to very hard, brown to dark gray, slightly moist to wet. (continued) STRATA BOREHOLE - STRATA.GDT - 11/9/16 14:46 - V:\STRATA - CASPER PROJECTS\T-Z\TETRA TECH, INC\WY1634A - FGD POND 5 - GT DRILLING\GEO\GINT LOGS\WY1634A LOGS.GPJ 4 45 Borehole Terminated at.1 Feet. /6." /1." 122 Project Name: FGD Pond 5 - Naughton Power Plant - Kemmerer, Wyoming Project Number: WY1634A Client: Tetra Tech, Inc. Date Drilled: 6/15/216 Drill Rig: CME 55 Borehole Dia.: 4" SSA Groundwater Depth: 36' Drilled By: STRATA Logged By: M. Medley 15 BORING LOG B-2 Sheet 2 Of 2

15 USCS Description Depth (ft) Symbol Sample Type SPT Blows Per 6 Inches SPT - N Dry Density (pcf) TEST RESULTS Pocket Penetrometer, TSF SPT, N-Value % Passing No. 2 Sieve PL MC LL Note: BGS = Below Ground Surface TOPSOIL, (6 inches thick). (CL) Sandy LEAN CLAY, stiff to hard, brown, slightly moist CL STRATA BOREHOLE - STRATA.GDT - 11/9/16 14:46 - V:\STRATA - CASPER PROJECTS\T-Z\TETRA TECH, INC\WY1634A - FGD POND 5 - GT DRILLING\GEO\GINT LOGS\WY1634A LOGS.GPJ CLAYSTONE BEDROCK, medium hard to very hard, browny, slightly moist. Project Name: FGD Pond 5 - Naughton Power Plant - Kemmerer, Wyoming Project Number: WY1634A Date Drilled: 6/8/216 Groundwater Depth: 26' /6." Client: Tetra Tech, Inc Drill Rig: CME 55 Drilled By: STRATA Borehole Dia.: 4" SSA Logged By: M. Medley (Continued Next Page) BORING LOG B-3 Sheet 1 Of 2

16 USCS Description Depth (ft) Symbol Sample Type SPT Blows Per 6 Inches SPT - N Dry Density (pcf) TEST RESULTS Pocket Penetrometer, TSF SPT, N-Value % Passing No. 2 Sieve PL MC LL Note: BGS = Below Ground Surface CLAYSTONE BEDROCK, medium hard to very hard, browny, slightly moist. (continued) 35 /1." STRATA BOREHOLE - STRATA.GDT - 11/9/16 14:46 - V:\STRATA - CASPER PROJECTS\T-Z\TETRA TECH, INC\WY1634A - FGD POND 5 - GT DRILLING\GEO\GINT LOGS\WY1634A LOGS.GPJ Borehole Terminated at.1 Feet /4." /3." /1." Project Name: FGD Pond 5 - Naughton Power Plant - Kemmerer, Wyoming Project Number: WY1634A Client: Tetra Tech, Inc. Date Drilled: 6/8/216 Drill Rig: CME 55 Borehole Dia.: 4" SSA Groundwater Depth: 26' Drilled By: STRATA Logged By: M. Medley BORING LOG B-3 Sheet 2 Of 2

17 USCS Description Depth (ft) Symbol Sample Type SPT Blows Per 6 Inches SPT - N Dry Density (pcf) TEST RESULTS Pocket Penetrometer, TSF SPT, N-Value % Passing No. 2 Sieve PL MC LL Note: BGS = Below Ground Surface TOPSOIL, (12 inches thick) STRATA BOREHOLE - STRATA.GDT - 11/9/16 14:46 - V:\STRATA - CASPER PROJECTS\T-Z\TETRA TECH, INC\WY1634A - FGD POND 5 - GT DRILLING\GEO\GINT LOGS\WY1634A LOGS.GPJ (CL) Sandy LEAN CLAY, stiff, brown, slightly moist. CLAYSTONE BEDROCK, medium hard to very hard, brown to dark gray, dry to moist. /6." /6." Project Name: FGD Pond 5 - Naughton Power Plant - Kemmerer, Wyoming Project Number: WY1634A Date Drilled: Groundwater Depth: N.E. Client: Tetra Tech, Inc Drill Rig: CME 55 Drilled By: STRATA CL Borehole Dia.: 4" SSA Logged By: M. Medley (Continued Next Page) BORING LOG B-4 Sheet 1 Of 2

18 USCS Description Depth (ft) Symbol Sample Type SPT Blows Per 6 Inches SPT - N Dry Density (pcf) TEST RESULTS Pocket Penetrometer, TSF SPT, N-Value % Passing No. 2 Sieve PL MC LL Note: BGS = Below Ground Surface CLAYSTONE BEDROCK, medium hard to very hard, brown to dark gray, dry to moist. (continued) 35 /5." STRATA BOREHOLE - STRATA.GDT - 11/9/16 14:46 - V:\STRATA - CASPER PROJECTS\T-Z\TETRA TECH, INC\WY1634A - FGD POND 5 - GT DRILLING\GEO\GINT LOGS\WY1634A LOGS.GPJ Borehole Terminated at.1 Feet /3." /4." /1." Project Name: FGD Pond 5 - Naughton Power Plant - Kemmerer, Wyoming Project Number: WY1634A Client: Tetra Tech, Inc. Date Drilled: Drill Rig: CME 55 Borehole Dia.: 4" SSA Groundwater Depth: N.E. Drilled By: STRATA Logged By: M. Medley BORING LOG B-4 Sheet 2 Of 2

19 USCS Description Depth (ft) Symbol Sample Type SPT Blows Per 6 Inches SPT - N Dry Density (pcf) TEST RESULTS Pocket Penetrometer, TSF SPT, N-Value % Passing No. 2 Sieve PL MC LL Note: BGS = Below Ground Surface TOPSOIL, (6 inches thick). CLAYSTONE BEDROCK, firm to very hard, brown to dark gray, slightly moist to wet STRATA BOREHOLE - STRATA.GDT - 11/9/16 14:46 - V:\STRATA - CASPER PROJECTS\T-Z\TETRA TECH, INC\WY1634A - FGD POND 5 - GT DRILLING\GEO\GINT LOGS\WY1634A LOGS.GPJ /6." /5." /4." Borehole Terminated at 3.9 Feet. Project Name: FGD Pond 5 - Naughton Power Plant - Kemmerer, Wyoming Project Number: WY1634A Client: Tetra Tech, Inc. Date Drilled: 6//216 Drill Rig: CME 55 Borehole Dia.: 4" SSA Groundwater Depth: 25' Drilled By: STRATA Logged By: M. Medley BORING LOG B- Sheet 1 Of 1

20 USCS Description Depth (ft) Symbol Sample Type SPT Blows Per 6 Inches SPT - N Dry Density (pcf) TEST RESULTS Pocket Penetrometer, TSF SPT, N-Value % Passing No. 2 Sieve PL MC LL Note: BGS = Below Ground Surface TOPSOIL, (6 inches thick). CLAYSTONE BEDROCK, medium hard to very hard, brown to dark gray, slightly moist to wet STRATA BOREHOLE - STRATA.GDT - 11/9/16 14:46 - V:\STRATA - CASPER PROJECTS\T-Z\TETRA TECH, INC\WY1634A - FGD POND 5 - GT DRILLING\GEO\GINT LOGS\WY1634A LOGS.GPJ Borehole Terminated at 3.4 Feet. Project Number: WY1634A 28 /5." Project Name: FGD Pond 5 - Naughton Power Plant - Kemmerer, Wyoming Date Drilled: 6/15/216 Groundwater Depth: 16' Client: Tetra Tech, Inc Drill Rig: CME 55 Drilled By: STRATA Borehole Dia.: 4" SSA Logged By: M. Medley BORING LOG B-11 Sheet 1 Of 1

21 USCS Description Depth (ft) Symbol Sample Type SPT Blows Per 6 Inches SPT - N Dry Density (pcf) TEST RESULTS Pocket Penetrometer, TSF SPT, N-Value % Passing No. 2 Sieve PL MC LL Note: BGS = Below Ground Surface TOPSOIL, (6 inches thick). (CL) Sandy LEAN CLAY, stiff, brown, slightly moist. CLAYSTONE BEDROCK, medium hard to very hard, brown to dark gray, slightly moist to wet. CL STRATA BOREHOLE - STRATA.GDT - 11/9/16 14:46 - V:\STRATA - CASPER PROJECTS\T-Z\TETRA TECH, INC\WY1634A - FGD POND 5 - GT DRILLING\GEO\GINT LOGS\WY1634A LOGS.GPJ Borehole Terminated at 3.9 Feet. Project Name: FGD Pond 5 - Naughton Power Plant - Kemmerer, Wyoming Project Number: WY1634A Date Drilled: 6/9/216 Groundwater Depth: 25' /5." Client: Tetra Tech, Inc Drill Rig: CME 55 Drilled By: STRATA Borehole Dia.: 4" SSA Logged By: M. Medley BORING LOG B-12 Sheet 1 Of 1

22 USCS Description Depth (ft) Symbol Sample Type SPT Blows Per 6 Inches SPT - N Dry Density (pcf) TEST RESULTS Pocket Penetrometer, TSF SPT, N-Value % Passing No. 2 Sieve PL MC LL Note: BGS = Below Ground Surface TOPSOIL, (6 inches thick). CLAYSTONE BEDROCK, medium hard to very hard, brown to dark gray, slightly moist to wet STRATA BOREHOLE - STRATA.GDT - 11/9/16 14:46 - V:\STRATA - CASPER PROJECTS\T-Z\TETRA TECH, INC\WY1634A - FGD POND 5 - GT DRILLING\GEO\GINT LOGS\WY1634A LOGS.GPJ /5." Borehole Terminated at 3.4 Feet. Project Name: FGD Pond 5 - Naughton Power Plant - Kemmerer, Wyoming Project Number: WY1634A Client: Tetra Tech, Inc. Date Drilled: 6/15/216 Drill Rig: CME 55 Borehole Dia.: 4" SSA Groundwater Depth: 19' Drilled By: STRATA Logged By: M. Medley BORING LOG B-13 Sheet 1 Of 1

23 USCS Description Depth (ft) Symbol Sample Type SPT Blows Per 6 Inches SPT - N Dry Density (pcf) TEST RESULTS Pocket Penetrometer, TSF SPT, N-Value % Passing No. 2 Sieve PL MC LL Note: BGS = Below Ground Surface TOPSOIL, (6 inches thick). (CL) Sandy LEAN CLAY, very stiff, brown, slightly moist CL STRATA BOREHOLE - STRATA.GDT - 11/9/16 14:46 - V:\STRATA - CASPER PROJECTS\T-Z\TETRA TECH, INC\WY1634A - FGD POND 5 - GT DRILLING\GEO\GINT LOGS\WY1634A LOGS.GPJ CLAYSTONE BEDROCK, medium hard to very hard, brown to dark gray, slightly moist to wet. Borehole Terminated at 3.4 Feet. Project Number: WY1634A /5." /6." /5." Project Name: FGD Pond 5 - Naughton Power Plant - Kemmerer, Wyoming Date Drilled: 6/14/216 Groundwater Depth: 26' Client: Tetra Tech, Inc Drill Rig: CME 55 Drilled By: STRATA 44 Borehole Dia.: 4" SSA Logged By: M. Medley BORING LOG B-14 Sheet 1 Of 1

24 USCS Description Depth (ft) Symbol Sample Type SPT Blows Per 6 Inches SPT - N Dry Density (pcf) TEST RESULTS Pocket Penetrometer, TSF SPT, N-Value % Passing No. 2 Sieve PL MC LL Note: BGS = Below Ground Surface TOPSOIL, (6 inches thick). (CL) Sandy LEAN CLAY, hard, brown, slightly moist STRATA BOREHOLE - STRATA.GDT - 11/9/16 14:46 - V:\STRATA - CASPER PROJECTS\T-Z\TETRA TECH, INC\WY1634A - FGD POND 5 - GT DRILLING\GEO\GINT LOGS\WY1634A LOGS.GPJ CLAYSTONE BEDROCK, medium hard to very hard, brown to dark gray, slightly moist. Borehole Terminated at 3.4 Feet. Project Number: WY1634A /5." Project Name: FGD Pond 5 - Naughton Power Plant - Kemmerer, Wyoming Date Drilled: 6/14/216 Groundwater Depth: N.E. Client: Tetra Tech, Inc Drill Rig: CME 55 Drilled By: STRATA CL Borehole Dia.: 4" SSA Logged By: M. Medley BORING LOG B-15 Sheet 1 Of 1

25 USCS Description Depth (ft) Symbol Sample Type SPT Blows Per 6 Inches SPT - N Dry Density (pcf) TEST RESULTS Pocket Penetrometer, TSF SPT, N-Value % Passing No. 2 Sieve PL MC LL Note: BGS = Below Ground Surface TOPSOIL, (6 inches thick). (CL) Sandy LEAN CLAY, stiff, brown, slightly moist. CL CLAYSTONE BEDROCK, firm to very hard, brown to dark gray, slightly moist. 3 STRATA BOREHOLE - STRATA.GDT - 11/9/16 14:46 - V:\STRATA - CASPER PROJECTS\T-Z\TETRA TECH, INC\WY1634A - FGD POND 5 - GT DRILLING\GEO\GINT LOGS\WY1634A LOGS.GPJ /4." /4." Borehole Terminated at 3.3 Feet. Project Name: FGD Pond 5 - Naughton Power Plant - Kemmerer, Wyoming Project Number: WY1634A Client: Tetra Tech, Inc. Date Drilled: 6/8/216 Drill Rig: CME 55 Borehole Dia.: 4" SSA Groundwater Depth: 2' Drilled By: STRATA Logged By: M. Medley BORING LOG B-16 Sheet 1 Of 1

26 USCS Description Depth (ft) Symbol Sample Type SPT Blows Per 6 Inches SPT - N Dry Density (pcf) TEST RESULTS Pocket Penetrometer, TSF SPT, N-Value % Passing No. 2 Sieve PL MC LL Note: BGS = Below Ground Surface TOPSOIL, (6 inches thick). (CL) Sandy LEAN CLAY, stiff, brown, slightly moist STRATA BOREHOLE - STRATA.GDT - 11/9/16 14:46 - V:\STRATA - CASPER PROJECTS\T-Z\TETRA TECH, INC\WY1634A - FGD POND 5 - GT DRILLING\GEO\GINT LOGS\WY1634A LOGS.GPJ CLAYSTONE BEDROCK, firm, brown to dark gray, slightly moist. Borehole Terminated at 25.3 Feet. Project Number: WY1634A /4." Project Name: FGD Pond 5 - Naughton Power Plant - Kemmerer, Wyoming Date Drilled: 6/8/216 Groundwater Depth: 13.5' Client: Tetra Tech, Inc Drill Rig: CME 55 Drilled By: STRATA CL 46 Borehole Dia.: 4" SSA Logged By: M. Medley BORING LOG B-17 Sheet 1 Of 1

27 USCS Description Depth (ft) Symbol Sample Type SPT Blows Per 6 Inches SPT - N Dry Density (pcf) TEST RESULTS Pocket Penetrometer, TSF SPT, N-Value % Passing No. 2 Sieve PL MC LL Note: BGS = Below Ground Surface TOPSOIL, (6 inches thick). (CL) Sandy LEAN CLAY, stiff, brown, slightly moist. CL CLAYSTONE BEDROCK, medium hard to very hard, gray to dark gray, slightly moist to moist. 4 STRATA BOREHOLE - STRATA.GDT - 11/9/16 14:46 - V:\STRATA - CASPER PROJECTS\T-Z\TETRA TECH, INC\WY1634A - FGD POND 5 - GT DRILLING\GEO\GINT LOGS\WY1634A LOGS.GPJ /3." /4." Borehole Terminated at 3.3 Feet. Project Name: FGD Pond 5 - Naughton Power Plant - Kemmerer, Wyoming Project Number: WY1634A Client: Tetra Tech, Inc. Date Drilled: 6/8/216 Drill Rig: CME 55 Borehole Dia.: 4" SSA Groundwater Depth: 18' Drilled By: STRATA Logged By: M. Medley BORING LOG B-18 Sheet 1 Of 1

28 USCS Description Depth (ft) Symbol Sample Type SPT Blows Per 6 Inches SPT - N Dry Density (pcf) TEST RESULTS Pocket Penetrometer, TSF SPT, N-Value % Passing No. 2 Sieve PL MC LL Note: BGS = Below Ground Surface TOPSOIL, (6 inches thick). (CL) Sandy LEAN CLAY, stiff to very stiff, brown, slightly moist CL 14 STRATA BOREHOLE - STRATA.GDT - 11/9/16 14:46 - V:\STRATA - CASPER PROJECTS\T-Z\TETRA TECH, INC\WY1634A - FGD POND 5 - GT DRILLING\GEO\GINT LOGS\WY1634A LOGS.GPJ CLAYSTONE BEDROCK, firm to very hard, gray to dark gray, slightly moist to moist. Borehole Terminated at 3.3 Feet. Project Number: WY1634A /4." /3." Project Name: FGD Pond 5 - Naughton Power Plant - Kemmerer, Wyoming Date Drilled: Groundwater Depth: N.E. Client: Tetra Tech, Inc Drill Rig: CME 55 Drilled By: STRATA Borehole Dia.: 4" SSA Logged By: M. Medley BORING LOG B-19 Sheet 1 Of 1

29 USCS Description Depth (ft) Symbol Sample Type SPT Blows Per 6 Inches SPT - N Dry Density (pcf) TEST RESULTS Pocket Penetrometer, TSF SPT, N-Value % Passing No. 2 Sieve PL MC LL Note: BGS = Below Ground Surface TOPSOIL, (6 inches thick). CLAYSTONE BEDROCK, very hard, brown to dark gray, slightly moist to wet. /6." STRATA BOREHOLE - STRATA.GDT - 11/9/16 14:46 - V:\STRATA - CASPER PROJECTS\T-Z\TETRA TECH, INC\WY1634A - FGD POND 5 - GT DRILLING\GEO\GINT LOGS\WY1634A LOGS.GPJ /5." Borehole Terminated at 2.4 Feet. Project Name: FGD Pond 5 - Naughton Power Plant - Kemmerer, Wyoming Project Number: WY1634A Client: Tetra Tech, Inc. Date Drilled: 6//216 Drill Rig: CME 55 Borehole Dia.: 4" SSA Groundwater Depth: 18' Drilled By: STRATA Logged By: M. Medley BORING LOG B-2 Sheet 1 Of 1

30 USCS Description Depth (ft) Symbol Sample Type SPT Blows Per 6 Inches SPT - N Dry Density (pcf) TEST RESULTS Pocket Penetrometer, TSF SPT, N-Value % Passing No. 2 Sieve PL MC LL Note: BGS = Below Ground Surface TOPSOIL, (6 inches thick). (CL) Sandy LEAN CLAY, stiff, brown, slightly moist. CLAYSTONE BEDROCK, medium hard to very hard, brown to dark gray, slightly moist to moist. CL STRATA BOREHOLE - STRATA.GDT - 11/9/16 14:46 - V:\STRATA - CASPER PROJECTS\T-Z\TETRA TECH, INC\WY1634A - FGD POND 5 - GT DRILLING\GEO\GINT LOGS\WY1634A LOGS.GPJ Borehole Terminated at 2.7 Feet. Project Name: FGD Pond 5 - Naughton Power Plant - Kemmerer, Wyoming Project Number: WY1634A Client: Tetra Tech, Inc. Date Drilled: 6/9/216 Drill Rig: CME 55 Borehole Dia.: 4" SSA Groundwater Depth: 15' Drilled By: STRATA Logged By: M. Medley BORING LOG B-21 Sheet 1 Of 1

31 USCS Description Depth (ft) Symbol Sample Type SPT Blows Per 6 Inches SPT - N Dry Density (pcf) TEST RESULTS Pocket Penetrometer, TSF SPT, N-Value % Passing No. 2 Sieve PL MC LL Note: BGS = Below Ground Surface TOPSOIL, (6 inches thick). (CL) Sandy LEAN CLAY, very hard, brown, slightly moist. CL STRATA BOREHOLE - STRATA.GDT - 11/9/16 14:46 - V:\STRATA - CASPER PROJECTS\T-Z\TETRA TECH, INC\WY1634A - FGD POND 5 - GT DRILLING\GEO\GINT LOGS\WY1634A LOGS.GPJ CLAYSTONE BEDROCK, firm to very hard, brown to dark gray, slightly moist. Borehole Terminated at 2.7 Feet. Project Name: FGD Pond 5 - Naughton Power Plant - Kemmerer, Wyoming Project Number: WY1634A Date Drilled: 6/9/216 Groundwater Depth: N.E. Client: Tetra Tech, Inc Drill Rig: CME 55 Drilled By: STRATA 25 4 Borehole Dia.: 4" SSA Logged By: M. Medley BORING LOG B-22 Sheet 1 Of 1

32 STRATA BOREHOLE - STRATA.GDT - 11/9/16 14:46 - V:\STRATA - CASPER PROJECTS\T-Z\TETRA TECH, INC\WY1634A - FGD POND 5 - GT DRILLING\GEO\GINT LOGS\WY1634A LOGS.GPJ USCS Description TOPSOIL, (6 inches thick). (CL) Sandy LEAN CLAY, stiff, brown, slightly moist. CLAYSTONE BEDROCK, firm, gray to dark gray, slightly moist. Borehole Terminated at 2.8 Feet. Depth (ft) Sample Type SPT Blows Per 6 Inches Project Name: FGD Pond 5 - Naughton Power Plant - Kemmerer, Wyoming Project Number: WY1634A Date Drilled: 6/8/216 Groundwater Depth: N.E. Symbol Client: Tetra Tech, Inc Drill Rig: CME 55 Drilled By: STRATA CL SPT - N Dry Density (pcf) Borehole Dia.: 4" SSA Logged By: M. Medley TEST RESULTS Pocket Penetrometer, TSF SPT, N-Value % Passing No. 2 Sieve PL MC LL Note: BGS = Below Ground Surface BORING LOG B-23 Sheet 1 Of 1

33 USCS Description Depth (ft) Symbol Sample Type SPT Blows Per 6 Inches SPT - N Dry Density (pcf) TEST RESULTS Pocket Penetrometer, TSF SPT, N-Value % Passing No. 2 Sieve PL MC LL Note: BGS = Below Ground Surface TOPSOIL, (6 inches thick). CLAYSTONE BEDROCK, very hard, brown to dark gray, slightly moist STRATA BOREHOLE - STRATA.GDT - 11/9/16 14:46 - V:\STRATA - CASPER PROJECTS\T-Z\TETRA TECH, INC\WY1634A - FGD POND 5 - GT DRILLING\GEO\GINT LOGS\WY1634A LOGS.GPJ 5 15 /6." 2 /5." Borehole Terminated at 2.4 Feet. Project Name: FGD Pond 5 - Naughton Power Plant - Kemmerer, Wyoming Project Number: WY1634A Client: Tetra Tech, Inc. Date Drilled: 6/13/216 Drill Rig: CME 55 Borehole Dia.: 4" SSA Groundwater Depth: N.E. Drilled By: STRATA Logged By: M. Medley BORING LOG B-24 Sheet 1 Of 1

34 USCS Description Depth (ft) Symbol Sample Type SPT Blows Per 6 Inches SPT - N Dry Density (pcf) TEST RESULTS Pocket Penetrometer, TSF SPT, N-Value % Passing No. 2 Sieve PL MC LL Note: BGS = Below Ground Surface TOPSOIL, (6 inches thick). CLAYSTONE BEDROCK, weathered to very hard, brown to dark gray, slightly moist STRATA BOREHOLE - STRATA.GDT - 11/9/16 14:46 - V:\STRATA - CASPER PROJECTS\T-Z\TETRA TECH, INC\WY1634A - FGD POND 5 - GT DRILLING\GEO\GINT LOGS\WY1634A LOGS.GPJ Borehole Terminated at 15.8 Feet. Project Name: FGD Pond 5 - Naughton Power Plant - Kemmerer, Wyoming Project Number: WY1634A Client: Tetra Tech, Inc. Date Drilled: 6/14/216 Drill Rig: CME 55 Borehole Dia.: 4" SSA Groundwater Depth: N.E. Drilled By: STRATA Logged By: M. Medley BORING LOG B-25 Sheet 1 Of 1

35 Particle Size Distribution Report 6 in. 3 in. 2 in. 1½ in. 1 in. ¾ in. ½ in. 3/8 in. #4 # #2 #3 #4 #6 # #14 # PERCENT FINER GRAIN SIZE - mm. % Gravel % Sand % Fines % +3" Coarse Fine Coarse Medium Fine Silt Clay.1 SIEVE PERCENT SPEC.* PASS? SIZE FINER PERCENT (X=NO) #4. # Lean CLAY Atterberg Limits PL= 2 LL= 39 PI= 19 Coefficients D 9 = D 85 = D 6 = D = D 3 = D 15 = D = C u = C c = USCS= CL Soil Description Classification AASHTO= A-6(19) * (no specification provided) Source of Sample: B-2 Depth: 2.5' Tetra Tech Billings, MT Client: Project: Project No: Naughton FGD Pond Date: Figure

36 Particle Size Distribution Report 6 in. 3 in. 2 in. 1½ in. 1 in. ¾ in. ½ in. 3/8 in. #4 # #2 #3 #4 #6 # #14 # PERCENT FINER GRAIN SIZE - mm. % Gravel % Sand % Fines % +3" Coarse Fine Coarse Medium Fine Silt Clay.1 SIEVE PERCENT SPEC.* PASS? SIZE FINER PERCENT (X=NO) #4. # Fat CLAY Atterberg Limits PL= 19 LL= 52 PI= 33 Coefficients D 9 = D 85 = D 6 = D = D 3 = D 15 = D = C u = C c = USCS= CH Soil Description Classification AASHTO= A-7-6(36) * (no specification provided) Source of Sample: B-2 Depth: 7.5' Tetra Tech Billings, MT Client: Project: Project No: Naughton FGD Pond Date: Figure

37 Particle Size Distribution Report 6 in. 3 in. 2 in. 1½ in. 1 in. ¾ in. ½ in. 3/8 in. #4 # #2 #3 #4 #6 # #14 # PERCENT FINER GRAIN SIZE - mm. % Gravel % Sand % Fines % +3" Coarse Fine Coarse Medium Fine Silt Clay.1 SIEVE PERCENT SPEC.* PASS? SIZE FINER PERCENT (X=NO) #4. # Leam CLAY Atterberg Limits PL= 19 LL= 49 PI= 3 Coefficients D 9 = D 85 = D 6 = D = D 3 = D 15 = D = C u = C c = USCS= CL Soil Description Classification AASHTO= A-7-6(32) * (no specification provided) Source of Sample: B-2 Depth: ' Tetra Tech Billings, MT Client: Project: Project No: Naughton FGD Pond Date: Figure

38 Particle Size Distribution Report 6 in. 3 in. 2 in. 1½ in. 1 in. ¾ in. ½ in. 3/8 in. #4 # #2 #3 #4 #6 # #14 # PERCENT FINER GRAIN SIZE - mm. % Gravel % Sand % Fines % +3" Coarse Fine Coarse Medium Fine Silt Clay.1 SIEVE PERCENT SPEC.* PASS? SIZE FINER PERCENT (X=NO) #4. # Lean CLAY Atterberg Limits PL= 17 LL= 49 PI= 32 Coefficients D 9 = D 85 = D 6 = D = D 3 = D 15 = D = C u = C c = USCS= CL Soil Description Classification AASHTO= A-7-6(34) * (no specification provided) Source of Sample: B-2 Depth: 15' Tetra Tech Billings, MT Client: Project: Project No: Naughton FGD Pond Date: Figure

39 Particle Size Distribution Report 6 in. 3 in. 2 in. 1½ in. 1 in. ¾ in. ½ in. 3/8 in. #4 # #2 #3 #4 #6 # #14 # PERCENT FINER GRAIN SIZE - mm. % Gravel % Sand % Fines % +3" Coarse Fine Coarse Medium Fine Silt Clay.1 SIEVE PERCENT SPEC.* PASS? SIZE FINER PERCENT (X=NO) #4. #2 98. Lean CLAY Atterberg Limits PL= 2 LL= 48 PI= 28 Coefficients D 9 = D 85 = D 6 = D = D 3 = D 15 = D = C u = C c = USCS= CL Soil Description Classification AASHTO= A-7-6(3) * (no specification provided) Source of Sample: B-2 Depth: 2' Tetra Tech Billings, MT Client: Project: Project No: Naughton FGD Pond Date: Figure

40 Particle Size Distribution Report 6 in. 3 in. 2 in. 1½ in. 1 in. ¾ in. ½ in. 3/8 in. #4 # #2 #3 #4 #6 # #14 # PERCENT FINER GRAIN SIZE - mm. % Gravel % Sand % Fines % +3" Coarse Fine Coarse Medium Fine Silt Clay.1 SIEVE PERCENT SPEC.* PASS? SIZE FINER PERCENT (X=NO) #4. #2 7.9 Soil Description Lean CLAY with Sand Atterberg Limits PL= 16 LL= 35 PI= 19 Coefficients D 9 = D 85 =.565 D 6 = D = D 3 = D 15 = D = C u = C c = USCS= CL Classification AASHTO= A-6(11) * (no specification provided) Source of Sample: B-3 Depth: 2.5' Tetra Tech Billings, MT Client: Project: Project No: Naughton FGD Pond Date: Figure

41 Particle Size Distribution Report 6 in. 3 in. 2 in. 1½ in. 1 in. ¾ in. ½ in. 3/8 in. #4 # #2 #3 #4 #6 # #14 # PERCENT FINER GRAIN SIZE - mm. % Gravel % Sand % Fines % +3" Coarse Fine Coarse Medium Fine Silt Clay.1 SIEVE PERCENT SPEC.* PASS? SIZE FINER PERCENT (X=NO) #4. #2 66. Soil Description Sandy Lean CLAY Atterberg Limits PL= 15 LL= 41 PI= 26 Coefficients D 9 = D 85 =.7613 D 6 = D = D 3 = D 15 = D = C u = C c = USCS= CL Classification AASHTO= A-7-6(15) * (no specification provided) Source of Sample: B-3 Depth: ' Tetra Tech Billings, MT Client: Project: Project No: Naughton FGD Pond Date: Figure

42 Particle Size Distribution Report 6 in. 3 in. 2 in. 1½ in. 1 in. ¾ in. ½ in. 3/8 in. #4 # #2 #3 #4 #6 # #14 # PERCENT FINER GRAIN SIZE - mm. % Gravel % Sand % Fines % +3" Coarse Fine Coarse Medium Fine Silt Clay.1 SIEVE PERCENT SPEC.* PASS? SIZE FINER PERCENT (X=NO) #4. # Fat CLAY Atterberg Limits PL= 22 LL= 52 PI= 3 Coefficients D 9 = D 85 = D 6 = D = D 3 = D 15 = D = C u = C c = USCS= CH Soil Description Classification AASHTO= A-7-6(31) * (no specification provided) Source of Sample: B-4 Depth: 2.5' Tetra Tech Billings, MT Client: Project: Project No: Naughton FGD Pond Date: Figure

43 Particle Size Distribution Report 6 in. 3 in. 2 in. 1½ in. 1 in. ¾ in. ½ in. 3/8 in. #4 # #2 #3 #4 #6 # #14 # PERCENT FINER GRAIN SIZE - mm. % Gravel % Sand % Fines % +3" Coarse Fine Coarse Medium Fine Silt Clay.1 SIEVE PERCENT SPEC.* PASS? SIZE FINER PERCENT (X=NO) #4. # Lean CLAY Atterberg Limits PL= 17 LL= 38 PI= 21 Coefficients D 9 = D 85 = D 6 = D = D 3 = D 15 = D = C u = C c = USCS= CL Soil Description Classification AASHTO= A-6(2) * (no specification provided) Source of Sample: B- Depth: 2.5' Tetra Tech Billings, MT Client: Project: Project No: Naughton FGD Pond Date: Figure

44 Particle Size Distribution Report 6 in. 3 in. 2 in. 1½ in. 1 in. ¾ in. ½ in. 3/8 in. #4 # #2 #3 #4 #6 # #14 # PERCENT FINER GRAIN SIZE - mm. % Gravel % Sand % Fines % +3" Coarse Fine Coarse Medium Fine Silt Clay.1 SIEVE PERCENT SPEC.* PASS? SIZE FINER PERCENT (X=NO) #4. # Lean CLAY Atterberg Limits PL= 18 LL= 37 PI= 19 Coefficients D 9 = D 85 = D 6 = D = D 3 = D 15 = D = C u = C c = USCS= CL Soil Description Classification AASHTO= A-6(19) * (no specification provided) Source of Sample: B- Depth: 7.5' Tetra Tech Billings, MT Client: Project: Project No: Naughton FGD Pond Date: Figure

45 Particle Size Distribution Report 6 in. 3 in. 2 in. 1½ in. 1 in. ¾ in. ½ in. 3/8 in. #4 # #2 #3 #4 #6 # #14 # PERCENT FINER GRAIN SIZE - mm. % Gravel % Sand % Fines % +3" Coarse Fine Coarse Medium Fine Silt Clay.1 SIEVE PERCENT SPEC.* PASS? SIZE FINER PERCENT (X=NO) #4. # Lean CLAY Atterberg Limits PL= 19 LL= 36 PI= 17 Coefficients D 9 = D 85 = D 6 = D = D 3 = D 15 = D = C u = C c = USCS= CL Soil Description Classification AASHTO= A-6(16) * (no specification provided) Source of Sample: B- Depth: 2' Tetra Tech Billings, MT Client: Project: Project No: Naughton FGD Pond Date: Figure

46 Particle Size Distribution Report 6 in. 3 in. 2 in. 1½ in. 1 in. ¾ in. ½ in. 3/8 in. #4 # #2 #3 #4 #6 # #14 # PERCENT FINER GRAIN SIZE - mm. % Gravel % Sand % Fines % +3" Coarse Fine Coarse Medium Fine Silt Clay.1 SIEVE PERCENT SPEC.* PASS? SIZE FINER PERCENT (X=NO) #4 # #2 #4 #8 # Lean CLAY Atterberg Limits PL= 16 LL= 38 PI= 22 Coefficients D 9 =.845 D 85 = D 6 = D = D 3 = D 15 = D = C u = C c = USCS= CL Soil Description Classification AASHTO= A-6(19) * (no specification provided) Source of Sample: B-14 Depth: 1'-5' Tetra Tech Billings, MT Client: Project: Project No: Naughton FGD Pond Date: Figure

47 Particle Size Distribution Report 6 in. 3 in. 2 in. 1½ in. 1 in. ¾ in. ½ in. 3/8 in. #4 # #2 #3 #4 #6 # #14 # PERCENT FINER GRAIN SIZE - mm. % Gravel % Sand % Fines % +3" Coarse Fine Coarse Medium Fine Silt Clay.1 SIEVE PERCENT SPEC.* PASS? SIZE FINER PERCENT (X=NO) 3/8 #4 # #2 #4 #8 # Lean CLAY Atterberg Limits PL= 18 LL= 46 PI= 28 Coefficients D 9 =.92 D 85 = D 6 = D = D 3 = D 15 = D = C u = C c = USCS= CL Soil Description Classification AASHTO= A-7-6(25) * (no specification provided) Source of Sample: B-23 Depth: 1'-5' Tetra Tech Billings, MT Client: Project: Project No: Naughton FGD Pond Date: Figure

48 Particle Size Distribution Report 6 in. 3 in. 2 in. 1½ in. 1 in. ¾ in. ½ in. 3/8 in. #4 # #2 #3 #4 #6 # #14 # PERCENT FINER GRAIN SIZE - mm. % Gravel % Sand % Fines % +3" Coarse Fine Coarse Medium Fine Silt Clay.1 SIEVE PERCENT SPEC.* PASS? SIZE FINER PERCENT (X=NO) # #2 #4 #8 # Lean CLAY Atterberg Limits PL= 19 LL= 46 PI= 27 Coefficients D 9 = D 85 = D 6 = D = D 3 = D 15 = D = C u = C c = USCS= CL Soil Description Classification AASHTO= A-7-6(29) * (no specification provided) Source of Sample: B-24 Depth: 5'-' Tetra Tech Billings, MT Client: Project: Project No: Naughton FGD Pond Date: Figure

49 COMPACTION TEST REPORT %, 7.8 pcf Dry density, pcf 6 4 ZAV for Sp.G. = Water content, % Test specification: ASTM D Method A Standard Elev/ Classification Nat. % > % < Sp.G. LL PI Depth USCS AASHTO Moist. #4 No.2 1'-5' CL A-6(19) TEST RESULTS MATERIAL DESCRIPTION Maximum dry density = 7.8 pcf Lean CLAY Optimum moisture = 17.5 % Project No Client: : Project: Naughton FGD Pond 5 Source of Sample: B-14 Tetra Tech Billings, MT Figure

50 COMPACTION TEST REPORT %, 4.3 pcf Dry density, pcf ZAV for Sp.G. = Water content, % Test specification: ASTM D Method A Standard Elev/ Classification Nat. % > % < Sp.G. LL PI Depth USCS AASHTO Moist. #4 No.2 1'-5' CL A-7-6(25) TEST RESULTS MATERIAL DESCRIPTION Maximum dry density = 4.3 pcf Lean CLAY Optimum moisture = 19.3 % Project No Client: : Project: Naughton FGD Pond 5 Source of Sample: B-23 Tetra Tech Billings, MT Figure

51 COMPACTION TEST REPORT %, 6.1 pcf Dry density, pcf 6 5 ZAV for Sp.G. = Water content, % Test specification: ASTM D Method A Standard Elev/ Classification Nat. % > % < Sp.G. LL PI Depth USCS AASHTO Moist. #4 No.2 5'-' CL A-7-6(29) TEST RESULTS MATERIAL DESCRIPTION Maximum dry density = 6.1 pcf Lean CLAY Optimum moisture = 18.7 % Project No Client: : Project: Naughton FGD Pond 5 Source of Sample: B-24 Tetra Tech Billings, MT Figure

52

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54

55 Project: Naughton FGD Pond 5 Job #: Hole # Depth wet+t dry+t t % m Mst Wt diameter height volume Wet Dens Dry Dens B B B B B-14. B B-24 5-