Board of Directors – Sept. 11, 2024: River Bend Lift Station Application, River Bend Creek Lift Station – Appendix H, Test boring logs

Map title

Test Boring Logs

Text on map

Test Boring Logs

Job No: 161921
FIG No. 4-11
Date: 4/2/18

Rocky Mountain Group

Architectural, Structural, Forensics, Geotechnical, Materials Testing, Civil Planning

Colorado Springs: (Corporate Office)
2910 Austin Bluffs Parkway
Colorado Springs, CO 80918
(719) 548-0600

SOUTHERN COLORADO, DENVER METRO, NORTHERN COLORADO

Test Boring C-1 and C-2

Alternative Text for Map Frame/Map Description

Cross section of test bores for C-1 and C-2 at the River Bend Crossing site.

Text Version

Test boring: C01
Date drilled: 3/12/18
Elevation (ft):
No groundwater on 3/12/18

Notes	Depth (ft)	Symbol	Samples	Blows per ft.	Water content %
2″ asphalt Sand, silty, with gravel, brown, medium dense to dense, moist		Asphalt
	5	Silty sand	Standard penetration test	17	2.8
	10	Silty sand	Standard penetration test	20	2.1
	15	Silty sand	Standard penetration test	17	3.8
	20	Silty sand	Standard penetration test	32	4.2

Test boring: C02
Date drilled: 3/12/18
Elevation (ft):
No groundwater on 3/12/18

Notes	Depth (ft)	Symbol	Samples	Blows per ft.	Water content %
2″ asphalt Sand, silty, with gravel, brown, medium dense, moist		Asphalt
	5	Silty sand	Standard penetration test	19	2.4
Boring caved at 9′ due to loose sands, bulk samples taken	10	Silty sand	Disturbed bulk sample		3.5
	15	Silty sand	Disturbed bulk sample		3.4
	20	Silty sand	Disturbed bulk sample		3.4

Test Boring C-3 and C-4

Alternative Text for Map Frame/Map Description

Cross section of test bores for C-3 and C-4 at the River Bend Crossing site.

Text Version

Test boring: C03
Date drilled: 3/12/18
Elevation (ft):
No groundwater on 3/12/18

Notes	Depth (ft)	Symbol	Samples	Blows per ft.	Water content %
2″ asphalt Sand, silty, with gravel, brown, medium dense, moist		Asphalt
	5	Silty sand	Standard penetration test	19	9.1
	10	Silty sand	Standard penetration test	29	2.9
	15	Silty sand	Standard penetration test	25	3.5
	20	Silty sand	Standard penetration test	38	2.6

Test boring: C04
Date drilled: 3/12/18
Elevation (ft):
No groundwater on 3/12/18

Notes	Depth (ft)	Symbol	Samples	Blows per ft.	Water content %
2″ asphalt Sand, silty, with gravel, brown, medium dense, moist		Asphalt
	5	Silty sand	Standard penetration test	18	2.1
	10	Silty sand	Standard penetration test	10	3.5
	15	Silty sand	Standard penetration test	17	2.1
	20	Silty sand	Disturbed bulk sample		2.3

Test Boring C-5 and R-1

Alternative Text for Map Frame/Map Description

Cross section of test bores for C-5 and R-1 at the River Bend Crossing site.

Text Version

Test boring: C05
Date drilled: 3/12/18
Elevation (ft):
No groundwater on 3/12/18

Notes	Depth (ft)	Symbol	Samples	Blows per ft.	Water content %
2″ asphalt Sand, silty, with gravel, brown, loose to medium dense, moist		Asphalt
	5	Silty sand	Standard penetration test	8	3.4
	10	Silty sand	Standard penetration test	24	3.4
	15	Silty sand	Standard penetration test	21	2.9
	20	Silty sand	Standard penetration test	25	4.3

Test boring: R01
Date drilled: 3/2/18
Elevation (ft):
Groundwater at 19 feet 3/2/18

Notes	Depth (ft)	Symbol	Samples	Blows per ft.	Water content %
Sand, silty to clayey, with gravel and cobbles, brown to reddish brown, medium dense to dense, moist to wet	5	Silty to clayey sand	Standard penetration test	17	4.3
	10	Silty to clayey sand	Standard penetration test	32	4.1
	15	Silty to clayey sand	Disturbed bulk sample		3.4
Free water table at 19 feet	20	Silty to clayey sand	Standard penetration test	17	13.6

Test Boring R-2 and R-3

Alternative Text for Map Frame/Map Description

Cross section of test bores for R-2 and R-3 at the River Bend Crossing site.

Text Version

Test boring: R02
Date drilled: 3/2/18
Elevation (ft):
Groundwater at 13 feet 3/5/18

Notes	Depth (ft)	Symbol	Samples	Blows per ft.	Water content %
Sand, silty to clayey, with gravel, brown, loose, moist	5	Silty to clayey sand	Standard penetration test	9	11.5
Sandy, silty, with gravel and cobbles, tan and reddish brown to gray, medium dense, moist to wet	10	Silty sand	Standard penetration test	17	1.6
Free water table at 13 feet. Boring caves at 14 feet due to loose sands, bulk samples taken	15	Silty sand	Disturbed bulk sample		3.5
	20	Silty sand	Disturbed bulk sample		12.8

Test boring: R03
Date drilled: 3/2/18
Elevation (ft):
Groundwater at 13 feet 3/5/18

Notes	Depth (ft)	Symbol	Samples	Blows per ft.	Water content %
Sand, silty to clayey, brown, loose, moist	5	Silty to clayey sand	Standard penetration test	7	7.7
	10	Silty to clayey sand	Standard penetration test	19	2.4
Free water table at 13 feet. Sand, silty, with gravel and cobbles, medium dense, moist to wet	15	Silty sand	Standard penetration test	15	14.4
	20	Silty sand	Standard penetration test	19	8.2

Test Boring R-4 and R-5

Alternative Text for Map Frame/Map Description

Cross section of test bores for R-4 and R-5 at the River Bend Crossing site.

Text Version

Test boring: R04
Date drilled: 3/2/18
Elevation (ft):
No groundwater on 3/2/18

Notes	Depth (ft)	Symbol	Samples	Blows per ft.	Water content %
Sand, silty, with gravel and cobbles, brown to dark brown, loose to medium dense, moist	5	Silty sand	Standard penetration test	8	3.0
	10	Silty sand	Standard penetration test	11	1.8
	15	Silty sand	Standard penetration test	26	3.5
	20	Silty sand	Disturbed bulk sample		3.0

Test boring: R05
Date drilled: 3/2/18
Elevation (ft):
Groundwater at 12 feet 3/5/18

Notes	Depth (ft)	Symbol	Samples	Blows per ft.	Water content %
Sand, silty to clayey, brown, medium dense, moist	5	Silty to clayey sand	Standard penetration test	10	9.4
Sand, silty, with gravel and cobbles, tan, loose to medium dense, moist to wet	10	Silty sand	Standard penetration test	17	2.5
Free water table at 12 feet. Clay, silty, brown to gray with rust staining, moist to wet	15	Silty sand	Standard penetration test	9	31.4
	20	Silty clay	Disturbed bulk sample		29.3

Test Boring R-6 and R-7

Alternative Text for Map Frame/Map Description

Cross section of test bores for R-6 and R-7 at the River Bend Crossing site.

Text Version

Test boring: R06
Date drilled: 3/2/18
Elevation (ft):
Groundwater at 7 feet 3/5/18

Notes	Depth (ft)	Symbol	Samples	Blows per ft.	Water content %
Sand, silty, with gravel and cobbles, brown, medium dense, moist	5	Silty sand	Standard penetration test	22	20.6
Free water table at 7 feet. Claystone, silty, gray to dark gray with rust staining, firm, moist to wet	10	Silty sand	Standard penetration test	27	5.3
Shale, silty, gray to dark gray, very hard, moist to wet	15	Claystone, shale starting at 12 feet	Disturbed bulk sample		31.0
	20	Shale	Standard penetration test	50/5″	20.5

Test boring: R07
Date drilled: 3/2/18
Elevation (ft):
No groundwater on 3/2/18

Notes	Depth (ft)	Symbol	Samples	Blows per ft.	Water content %
Sand, silty, with gravel and cobbles, brown to reddish brown, loose, moist	5	Silty sand	Standard penetration test	9	3.8
Boring caved at 9 feet due to loose sands, bulk samples taken	10	Silty sand	Disturbed bulk sample		3.0
	15	Silty sand	Disturbed bulk sample		2.1
	20	Silty sand	Disturbed bulk sample		2.7

Test Boring R-8 and R-9

Alternative Text for Map Frame/Map Description

Cross section of test bores for R-8 and R-9 at the River Bend Crossing site.

Text Version

Test boring: R08
Date drilled: 3/2/18
Elevation (ft):
Groundwater at 19.5 feet 3/1/18

Notes	Depth (ft)	Symbol	Samples	Blows per ft.	Water content %
Sand, silty, with gravel and cobbles, medium dense, moist	5	Silty sand	Standard penetration test	17	13.4
Claystone, silty, brown to gray, hard, moist	10	Claystone	Standard penetration test	50/11″	23.0
Shale, silty, gray to dark gray, very hard, moist to wet	15	Claystone, shale starting at 13 feet	Undisturbed California sample	50/6″	13.6
Free water table at 20 feet	20	Shale	Disturbed bulk sample		13.1

Test boring: R09
Date drilled: 3/2/18
No groundwater on 3/2/18

Notes	Depth (ft)	Symbol	Samples	Blows per ft.	Water content %
Sand, silty, with gravel and cobbles, brown to reddish brown, loose to medium dense, moist	5	Silty sand	Standard penetration test	6	1.7
	10	Silty sand	Standard penetration test	14	3.3
	15	Silty sand	Standard penetration test	18	3.9
	20	Silty sand	Standard penetration test	17	2.8

Test Boring R-10 and R-11

Alternative Text for Map Frame/Map Description

Cross section of test bores for R-10 and R-11 at the River Bend Crossing site.

Text Version

Test boring: R10
Date drilled: 3/2/18
Elevation (ft):
Groundwater at 6 feet 3/5/18

Notes	Depth (ft)	Symbol	Samples	Blows per ft.	Water content %
Sand, silty to clayey, with gravel and cobbles, medium dense, moist to wet	5	Silty to clayey sand	Standard penetration test	10	4.0
Free water table at 6 feet. Shale, silty, gray to dark gray, hard moist to wet.	10	Shale	Undisturbed California sample	20	17.7
	15	Claystone, shale starting at 13 feet	Undisturbed California sample	50/7″	14.5
	20	Shale	Disturbed bulk sample		35.5

Test boring: R11
Date drilled: 3/2/18
Elevation (ft):
Groundwater at 17 feet 3/5/18

Notes	Depth (ft)	Symbol	Samples	Blows per ft.	Water content %
Sand, silty to clayey, brown, loose, moist	5	Silty to clayey sand	Standard penetration test	7	11.1
Sand, silty, with gravel and cobbles, medium dense, moist	10	Silty sand	Standard penetration test	16	8.3
Claystone, sandy, gray with rust staining, medium hard, moist. Free water table at 17 feet and shale, silty, gray to dark gray, very hard, moist to wet	15	Claystone at 14 feet	Standard penetration test	30	28.3
	20	Shale at 16 feet	Standard penetration test	50/6″	19.1

Summary of Laboratory Test Results

Test Boring No.	Depth	Water Content (%)	Dry Density (pcf)	Liquid Limit	Plasticity Index	% Retained No. 4 Sieve	% Passing No. 200 Sieve	FHA Expansion Pressure (psf)	% Swell/Collapse	USCS Classification
Test Boring No.	Depth	Water Content (%)	Dry Density (pcf)	Liquid Limit	Plasticity Index	% Retained No. 4 Sieve	% Passing No. 200 Sieve	FHA Expansion Pressure (psf)	% Swell/Collapse	USCS Classification
C01	4.0	2.8
C01	9.0	2.1		NP	NO	44.7	3.4			SW
C01	14.0	3.8
C01	19.0	3.8
C02	4.0	2.4
C02	9.0	3.5
C02	14.0	3.4		NP	NP	21.3	7.1			SW-SM
C02	19.0	3.4
C03	4.0	9.1		NP	NP	20.5	15.1			SM
C03	9.0	2.9
C03	14.0	3.5
C03	19.0	2.6
C04	4.0	2.1
C04	9.0	3.5		NP	NP	22.7	7.0			SW-SM
C04	14.0	2.1
C04	19.0	2.3
C05	4.0	3.4
C05	9.0	3.4
C05	14.0	2.9		NP	NP	28.3	3.3			SW
C05	19.0	4.3
R01	4.0	4.3
R01	9.0	4.1		NP	NP	34.8	3.1			SP
R01	14.0	3.4
R01	19.0	13.6
R02	4.0	11.5
R02	9.0	1.6
R02	14.0	3.5		NP	NP	33.4	8.7			SP-SM
R02	19.0	12.8
R03	4.0	7.7		NP	NP		79.6			ML
R03	9.0	2.4
R03	14.0	14.4
R03	19.0	8.2
R04	4.0	3.0		NP	NP	23.5	3.7			SW
R04	9.0	1.8
R04	14.0	3.5
R04	19.0	3.0
R05	4.0	9.4
R05	9.0	2.5
R05	14.0	31.4		55	37		56.9			CH
R05	19.0	29.3
R06	4.0	20.6
R06	9.0	5.3
R06	14.0	31.0		53	33		88.5			CH
R06	19.0	20.6
R07	4.0	3.8
R07	9.0	3.0		NP	NP	48.9	3.9			GP
R07	14.0	2.1
R07	19.0	2.7
R08	4.0	13.4
R08	9.0	23.0	105.2	53	29		91.6		3.0	CH
R08	14.0	13.6
R08	19.0	13.1
R09	4.0	1.7
R09	9.0	3.3
R09	14.0	3.9		NP	NP	20.4	5.7			SW-SM
R09	19.0	2.8
R10	4.0	4.0
R10	9.0	17.7	109.6	43	30		85.6		-0.1	CL
R10	14.0	14.5
R10	19.0	35.5
R11	4.0	11.1		37	23		66.2			CL
R11	9.0	8.3
R11	14.0	28.3
R11	19.0	19.1