10-18218 Geotech FINAL 20260220 Bore Logs at 400 E Crossing.pdf

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Attached to
IFB - SGES Guided Horizontal Directional Drill (HDD) Under I-15 @ 400 East
Solicitation number
26-275
Issued by
Washington County, Utah

About this file

Written by GovTribe AI ·

This is a geotechnical boring log and photographic rock core summary document prepared for the Utah Department of Transportation (UDOT) in support of the I-15 widening project from Exit 6 to Exit 8 (Project No. F-I15-1(136)6, PIN 18218). The document contains field study locations and borehole data collected at the 400 East crossing, including photographic documentation of rock core samples extracted from multiple test holes and cone penetration test (CPT) soundings. The bore logs detail subsurface geological conditions at depths ranging from approximately 20 feet to 100 feet, with specific documentation of test holes 24-S-07, 24-S-08, and 25-TH-55, providing visual records of rock strata, composition, and core recovery at various depth intervals to inform the design of the proposed guided horizontal directional drill (HDD) operation.

The geotechnical investigation provides essential subsurface information necessary for the City of St. George to evaluate contractor proposals for the HDD operation beneath I-15 at 400 East, which will install underground power conduits to replace existing overhead distribution facilities. The bore logs establish baseline geological conditions and drilling parameters that qualified contractors must consider when submitting bids. The photographic documentation of rock cores demonstrates the soil and rock characteristics encountered during drilling, enabling bidders to assess drilling difficulty, anticipated penetration rates, and equipment requirements. This geotechnical data serves as a critical supporting exhibit for the invitation for bid (IFB) process and helps establish the technical specifications and site conditions that will govern contract performance and bid bond requirements.

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24-E-10 (62')

25-W-09 (55')

24-S-08 (80')

24-S-06 (80')

24-S-05 (80')

24-E-02 (54')

25-E-01 (62')

25-TH-56 (52')

25-TH-55 (71')

24-S-07b (46')

24-S-07a (49')24-S-07 (100')

24-S-05c (51')

24-S-05b (52') 24-S-05a (42')

25-CPT-07b (32') 25-CPT-07a (33')

25-W-CPT-13 (54')

25-W-CPT-11b (50') 25-W-CPT-11a (30')

25-W-CPT-04c (21')

25-W-CPT-04b (20') 25-W-CPT-04a (21')

25-W-CPT-03d (20')

25-W-CPT-03c (21') 25-W-CPT-03b (20')

25-W-CPT-03a (20')

25-W-DMT-13 (29')

25-W-DMT-04 (11')

Field Study Locations (2 of 4)

Figure 3-2I-15; Widening from Exit 6 to Exit 8 Project No.: F-I15-1(136)6 / PIN 18218 ±

0 150 30075 Feet

Explanation

!UA Drilled Test Hole Locations (Depth)

*#9 CPT Sounding Locations (Depth) !. Flat Plate Dilatometer Test Locations (Depth) !UA Existing Drilled Test Hole Locations (Depth)

Retaining Walls Layout Noise Walls Layout Structures Layout

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900 South

1160 South

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24-S-07a (49')

25-W-DMT-11 (26')

koby.dutson Rectangle koby.dutson Rectangle weston.nelson Rectangle weston.nelson Rectangle weston.nelson Rectangle weston.nelson PolyLine weston.nelson Engineer Approximate Borehole Location weston.nelson Engineer 400 East weston.nelson Rectangle

This photo log is for information purposes only. It is intended to assist in showing features discussed in the attached field logs.

1.

Notes:

PHOTOGRAPHIC SUMMARY OF ROCK CORE

I-15; Widening from Exit 6 to Exit 8

UDOT Project No. F-I15-1(135)6, PIN 18218

50-61Depth (ft):1-3Run(s):1Box Number:24-S-07 Test Hole

Location:

f t f t f t f t

1.

Notes:

PHOTOGRAPHIC SUMMARY OF ROCK CORE

I-15; Widening from Exit 6 to Exit 8

UDOT Project No. F-I15-1(135)6, PIN 18218

61-70Depth (ft):3-4Run(s):2Box Number:24-S-07 Test Hole

Location:

f t f t

1.

Notes:

PHOTOGRAPHIC SUMMARY OF ROCK CORE

I-15; Widening from Exit 6 to Exit 8

UDOT Project No. F-I15-1(135)6, PIN 18218

70-78Depth (ft):5-6Run(s):3Box Number:24-S-07 Test Hole

Location:

f t f t

1.

Notes:

PHOTOGRAPHIC SUMMARY OF ROCK CORE

I-15; Widening from Exit 6 to Exit 8

UDOT Project No. F-I15-1(135)6, PIN 18218

78-80Depth (ft):6Run(s):4Box Number:24-S-07 Test Hole

Location:

f t

1.

Notes:

PHOTOGRAPHIC SUMMARY OF ROCK CORE

I-15; Widening from Exit 6 to Exit 8

UDOT Project No. F-I15-1(135)6, PIN 18218

80-90Depth (ft):7-8Run(s):5Box Number:24-S-07 Test Hole

Location:

.0 f t

.0 f t

.0

1.

Notes:

PHOTOGRAPHIC SUMMARY OF ROCK CORE

I-15; Widening from Exit 6 to Exit 8

UDOT Project No. F-I15-1(135)6, PIN 18218

90-99.5Depth (ft):9-10Run(s):6Box Number:24-S-07 Test Hole

Location:

.0 f t f t

.5

1.

Notes:

PHOTOGRAPHIC SUMMARY OF ROCK CORE

I-15; Widening from Exit 6 to Exit 8

UDOT Project No. F-I15-1(135)6, PIN 18218

59-73.5Depth (ft):1-3Run(s):1Box Number:24-S-08 Test Hole

Location:

f t f t f t

.5

1.

Notes:

PHOTOGRAPHIC SUMMARY OF ROCK CORE

I-15; Widening from Exit 6 to Exit 8

UDOT Project No. F-I15-1(135)6, PIN 18218

73.5-80.0Depth (ft):3-4Run(s):2Box Number:24-S-08 Test Hole

Location:

.5 f t

.0 f t

.0

1.

Notes:

PHOTOGRAPHIC SUMMARY OF ROCK CORE

I-15; Widening from Exit 6 to Exit 8

UDOT Project No. F-I15-1(135)6, PIN 18218

62.5-70.5Depth (ft):1-3Run(s):1Box Number:25-TH-55 Test Hole

Location:

.5 f t

.5 f t

.5

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