cvc

Summary

The Lower Bird Creek Wastewater Treatment Plant (WWTP) FEB project, located at 151 W 36th St N, Catoosa, OK, involves the construction of new structures including a pump station, splitter box, and clarifier. The geotechnical investigation included three soil borings drilled to depths of approximately 25 feet, revealing a subsurface profile characterized by organic topsoil, medium to very stiff clay, and highly weathered limestone and shale. Groundwater was not encountered during drilling, but the potential for seasonal fluctuations exists. Notably, the site contains existing fill and materials from previous blasting operations, which may present challenges such as shrink/swell potential in the upper soil layers, with a predicted vertical rise of 0.7 to 1.7 inches.

For foundation design, a concrete slab-on-ground and wall/spread foundation system is recommended, with a net allowable bearing pressure of 2,000 psf for engineered fill and 4,000 psf for rock. Minimum footing embedment should be 24 inches, and the width should be at least 16 inches for walls and 30 inches for columns. It is crucial to over-excavate to remove previously blasted material and ensure proper compaction of engineered fill. Construction should be monitored by a geotechnical engineer to address any unsuitable materials encountered during excavation. Overall, the site is deemed suitable for the proposed development, provided that the outlined recommendations are adhered to throughout the construction process.

Document Sections

Section Type	Start Page	End Page	Description
Site Description	4	5	Overview of the project site, existing conditions, and planned construction.
Field Investigation	5	6	Details of the field exploration methods, boring locations, and sampling techniques.
Subsurface Conditions	6	7	Summary of subsurface conditions based on boring data.
Groundwater Conditions	7	7	Information on groundwater levels encountered during the investigation.
Laboratory Testing	7	8	Results of laboratory tests performed on soil samples.
Analysis & Conclusions	8	10	Analysis of data and conclusions regarding site suitability for proposed construction.
Recommendations	10	15	Geotechnical recommendations for site preparation, foundation design, and construction monitoring.
Construction Monitoring	15	16	Recommendations for monitoring construction activities to ensure compliance with geotechnical recommendations.
Limitations	16	16	Limitations of the report and the applicability of the recommendations.

Boring Log Pages: 25, 26, 27

Key Fields

Fill Depth Range

Range: 0.0 - 20.0 feet

Reference: Found in the Site Description: cut of approximately 6 to 20 feet may be required to reach the final site elevations.

Bearing Stratum

Description: Highly weathered, soft to moderately hard limestone and shale

Depth Range: 8.5 - 20.5 feet

Reference: Identified in the Subsurface section of the report.

Groundwater Depth

Depth: None feet

Note: Not encountered during drilling

Reference: Found in the Groundwater section: Groundwater was not encountered during or at the completion of drilling in any of the borings.

Recommended Bearing Capacity

Value: 2000 psf

Foundation Type: shallow

Reference: Stated in the Shallow Foundation Design section: Net Allowable Bearing Pressure is 2,000 psf.

Settlement Limits

Total Settlement: 1.0 inches

Reference: Stated in the Shallow Foundation Design section: Estimated Maximum Settlement Total ≤ 1 inch.

Differential Settlement: 0.5 inches

Reference: Stated in the Shallow Foundation Design section: Differential ≤ ½ inch.

Pile Load Capacity

Compression Capacity: None kips

Reference: No deep foundations such as piles are mentioned in the report.

Tension Capacity: None kips

Reference: No deep foundations such as piles are mentioned in the report.

Foundations Information

Foundations Summary

The geotechnical report for the Lower Bird Creek WWTP FEB project provides comprehensive foundation recommendations based on subsurface conditions and anticipated structural loads. The report suggests utilizing a combination of shallow foundations, specifically wall and spread footings, supported by engineered fill and rock. The allowable bearing capacity is specified, along with embedment depths and settlement criteria. Additionally, considerations for site preparation, drainage, and construction monitoring are emphasized to ensure the stability and integrity of the foundations.

General Foundation Recommendations (Shallow Foundations)

Foundation Type: Shallow Foundation

Allowable Bearing Capacity: 2.0 ksf

Reasoning: The net allowable bearing pressure is based on foundations within approved bearing materials.

Depth Requirement: 2.0 feet

Reasoning: Minimum footing embedment is specified as 24 inches for frost protection.

Settlement Criteria: Total ≤ 1 inch, Differential ≤ ½ inch

Additional Recommendations

It is recommended that all exposed foundation subgrades be re-compacted and evaluated for design soil bearing pressure prior to concrete placement. Additionally, a geotechnical engineer should monitor excavation activities to ensure proper handling of soils with moderate to high shrink/swell potential.

Boring Logs (3 found)

B-14 Terminated at 15.08 ft

#	Depth (ft)	USCS	Description	SPT N	Sampler	Notes
1	0 - 0.167	-	TOPSOIL - 2 inches	-	-	-
2	0.167 - 3.5	CL	LEAN CLAY w/ SAND, trace sand very stiff, medium and light brown, moist	13 @ 1.5'	-	-
3	3.5 - 8.5	SC	CLAYEY SAND w/ trace limestone fragments loose, medium brown, moist	4 @ 8.0'	-	-
4	8.5 - 15.0	-	CLAYEY SAND w/ limestone fragments very dense, light brown, moist	58 @ 10.0'	-	-
5	15.0 - 15.08	-	SHALE w/ coal fragments, highly weathered soft, very dark gray, moist	50 @ 15.0'	-	-

Termination: Auger refusal encountered at 15 ft. Boring terminated at 15.08 ft.

B-15 Terminated at 20.5 ft

#	Depth (ft)	USCS	Description	SPT N	Sampler	Notes
1	0 - 0.25	-	TOPSOIL - 3 inches	5	-	-
2	0.25 - 4.0	CH	FAT CLAY w/ trace sand, medium stiff to stiff, dark grayish brown, moist	8 @ 0.25'	-	-
3	4.0 - 8.5	CH	FAT CLAY w/ trace sand, limestone fragments, stiff, medium brown, moist	7 @ 4.0'	-	-
4	8.5 - 13.5	CH	LEAN TO FAT CLAY w/ trace sand, very stiff, medium grayish brown, moist	13 @ 8.5'	-	-
5	13.5 - 18.5	SC	CLAYEY SAND w/ sandstone fragments, loose, medium grayish brown, moist	5 @ 13.5'	-	-
6	18.5 - 20.5	-	LIMESTONE highly weathered, soft to moderately hard, light gray, moist to dry	50 @ 18.5'	-	-

Termination: Auger refusal encountered at 20.5 ft. Boring terminated at 20.5 ft.

B-16 Terminated at 9.5 ft

#	Depth (ft)	USCS	Description	SPT N	Sampler	Notes
1	0 - 0.25	-	TOPSOIL - 3 inches	-	-	-
2	0.25 - 6.0	CL	LEAN CLAY w/ SAND, trace sandstone, limestone fragments stiff to very stiff, dark and medium brown, moist	13 @ 6.0'	-	-
3	6.0 - 8.5	CL	LEAN CLAY w/ SAND, trace limestone fragments very stiff, medium and light gray, moist	13 @ 8.5'	-	-
4	8.5 - 9.5	-	LIMESTONE highly weathered soft to moderately hard, light grayish brown, moist to dry	50 @ 8.5'	-	-

Termination: Boring terminated at 9.5 ft.

Report: cvc

Report Information

PDF File