Langan Rebuttal Report 9 15 2025

EXHIBIT C ROCK CORE SAMPLE PHOTOGRAPHS

Exhibit C – Select Rock Core Photographs LB-1 and LB-3 – Rock Core Samples

Exhibit C – Select Rock Core Photographs NLB-1 and NLB-3 – Rock Core Samples

Exhibit C – Select Rock Core Photographs NLB-2 and NLB-4 – Rock Core Samples

EXHIBIT D SPT N-VALUE AND INTERNAL ANGLE OF FRICTION CORRELATION FOR OVERBURDEN SOILS

SECTION A-A ANGLE OF WEST EAST AVERAGE N-VALUE INTERNAL LB-1 LB-2 surface elevation 604 522 total depth (feet) 24 50 (blows/ft) (degrees) 4 4 29 70 45 FRICTION (see note 7) 0 1 2 3 70 4 5 6 40 50 45 40 99 99 99 45 40 40 39 78 78 45 53 53 41 22 22 34 45 45 40 62 62 43 99 99 45 99 99 45 65 43 7 8 9 10 11 12 13 14 15 16 17 18 DEPTH FROM SURFACE GRADE (FT) 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 NOTES 1 2 3 4 5 6 7 Subsurface information provided is generalized and is shown for illustration purposes only. Refer to location plan for actual locations. Refer to logs for actual soil descriptions and details. The N-values tabulated are in blows/ft. Split spoon refusal values are represented by 99 blows/ft Split spoon refusal values in the decomposed rock layer are excluded in this table. The corresponding angle of internal friction was taken from Figure 19.5 of the "Foundation Engineering" (second edition) written by Ralph B. Peck, Walter E. Hanson and Thomas H. Thornburn

SECTION B-B ANGLE OF WEST EAST AVERAGE INTERNAL LB-3 LB-4 N-VALUE FRICTION surface elevation 614 548 total depth (feet) 19 45 (blows/ft) (degrees) 5 5 5 29 53 47 50 41 23 23 34 35 37 56 56 39 99 99 45 52 52 39 22 22 34 21 21 34 99 99 45 99 99 45 99 99 45 60 43 (see note 7) 0 1 2 3 4 5 6 7 8 35 9 10 11 12 13 14 15 16 DEPTH FROM SURFACE GRADE (FT) 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 NOTES 1 2 3 4 5 6 7 Subsurface information provided is generalized and is shown for illustration purposes only. Refer to location plan for actual locations. Refer to logs for actual soil descriptions and details. The N-values tabulated are in blows/ft. Split spoon refusal values are represented by 99 blows/ft Split spoon refusal values in the decomposed rock layer are excluded in this table. The corresponding angle of internal friction was taken from Figure 19.5 of the "Foundation Engineering" (second edition) written by Ralph B. Peck, Walter E. Hanson and Thomas H. Thornburn

SECTION C-C ANGLE OF WEST EAST AVERAGE INTERNAL NLB-2 NLB-1 N-VALUE FRICTION surface elevation 612 582 total depth (feet) 20 26 (blows/ft) (degrees) 4 6 5 29 18 56 37 37 29 27 28 35 25 65 45 40 25 99 62 43 43 39 (see note 7) 0 1 2 3 4 5 6 7 DEPTH FROM SURFACE GRADE (FT) 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 NOTES 1 Subsurface information provided is generalized and is shown for illustration purposes only. 2 3 4 5 Refer to location plan for actual locations. Refer to logs for actual soil descriptions and details. The N-values tabulated are in blows/ft. Split spoon refusal values are represented by 99 blows/ft 6 Split spoon refusal values in the decomposed rock layer are excluded in this table. 7 The corresponding angle of internal friction was taken from Figure 19.5 of the "Foundation Engineering" (second edition) written by Ralph B. Peck, Walter E. Hanson and Thomas H. Thornburn

SECTION D-D ANGLE OF WEST EAST AVERAGE INTERNAL NLB-4 NLB-3 N-VALUE FRICTION surface elevation 609 566 total depth (feet) 22 32 (blows/ft) (degrees) 2 6 4 29 20 9 15 32 16 11 14 32 99 35 67 45 50 50 41 99 99 45 43 43 39 99 99 45 72 45 (see note 7) 0 1 2 3 4 5 6 7 8 9 DEPTH FROM SURFACE GRADE (FT) 10 11 99 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 NOTES 1 2 3 4 5 6 7 Subsurface information provided is generalized and is shown for illustration purposes only. Refer to location plan for actual locations. Refer to logs for actual soil descriptions and details. The N-values tabulated are in blows/ft. Split spoon refusal values are represented by 99 blows/ft Split spoon refusal values in the decomposed rock layer are excluded in this table. The corresponding angle of internal friction was taken from Figure 19.5 of the "Foundation Engineering" (second edition) written by Ralph B. Peck, Walter E. Hanson and Thomas H. Thornburn