Appendix_1_Special_Conditions_Part_C_-Geotechnical_Laboratory_Results.pdf
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- Attached to
- Department of the Environment (DoE) Calvert Hills Stormwater Drainage Improvement - Parts C&D
- Solicitation number
- BPM048793
- Issued by
- Prince George's County, Choptank CDP, Maryland
About this file
This document contains geotechnical laboratory test results for the Calvert Hills-College Park Flooding Mitigation project in College Park, Maryland, conducted by Findling Inc. The testing was performed on soil samples from multiple boring locations (SWM-1 through SWM-8) at various depths, with results including natural moisture content, Atterberg limits, grain size distribution, and soil classifications according to USCS and AASHTO standards. The document includes detailed particle size distribution reports with graphs and data tables showing the percentages of gravel, sand, silt and clay in each sample.
The soil samples revealed varying compositions across the sites, including lean clay (CL), fat clay (CH), clayey sand (SC), and well-graded sand with silt (SW-SM). Moisture contents ranged from 4.2% to 59.9%, with liquid limits between 28 and 67 and plasticity indices between 11 and 44 where applicable. The testing was conducted between August 2017 and November 2021 under two project numbers (13-1019-12 and 13-1019-23), suggesting this was a multi-phase investigation. A site plan drawing is included showing boring locations relative to existing infrastructure.
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6 APPENDIX 1: SPECIAL CONDITIONS PART C -
GOTECHNICAL LABORATORY RESULTS
Summary of Laboratory Test Results Calvert Hills-College Park Flooding Mitigation
College Park, MD
Findling Project No.: 13-1019-12
Sa m pl e
ID
pl e D ep th
N at ur al
M oi st ur e C on te nt
Atterberg Limits
Grain Size Distribution
Standard Proctor
U
SC
S C la ss ifi ca to in
LL
PL
PI
GRAVEL
SAND
SILT
CLAY
Max Dry Density, pcf
Optimum
Moisture Content, %
SWM-1
S-1 0 - 2 21.2
S-2 2 4 20.1
S-3 4 6 19.8 33 18 15 0 36 36 28 CL
S-4 6 8 26.5
S-5 8 10 20.7 21 74 6
S-6 10 12 11.8
S-7 12 - 14 25.9
S-8 14 - 16 10.8
S-9 16 - 18
S-10 18 - 20 18.1
SWM-2
S-1 0 - 2 24.6
S-2 2 4 16.0 28 17 11 1 61 39 SC
S-3 4 6 9.6
S-4 6 8 9.8
S-5 8 10 14.1 51 44 4 GW
S-6 10 - 12 18.7
S-7 12 - 14 11.5
S-8 14 - 16 12.0
S-9 16 - 18 20.1
S-10 18 - 20 20.6
SWM-3
S-1 0 - 2 17.0
S-2 2 4 20.7 36 20 16 0 13 57 30 CL
S-3 4 6 4.2
S-4 6 8 9.5
S-5 8 10 7.4 59 35 6
S-6 10 - 12 20.1
S-7 12 - 14 13.2
S-8 14 - 16 19.7
S-9 16 - 18 9.1
S-10 18 - 20 27.7
Note: NV = Non Viscous, NP = Non Plastic
Particle Size Distribution Report
10 1
GRAIN SIZE - mm.
0.1
0.01
0.001
% +3" % Gravel % Sand % Fines
Coarse Fine Coarse Medium Fine Silt Clay
0.0 0.0 0.0 0.0 1.3 35.0 35.7 28.0
Project No.
13-1019-12
Client:
RK & K
Remarks:
Project: Calvert Hills-College Park Flooding Mitigation Moisture content = 19.8%
Source of Sample: SWM-1 Depth: 4.0'-6.0' Sample Number: S-3
Date: 8/11/17
Findling, Inc.
Baltimore, Maryland Figure
PE
R
C
EN
T
FI
ER
in in
1½ in in
¾ in
½ in
3/ in.
#4
#1
#2
#3
#4
#6
#2
Colloids LL PL D85 D60 D50 D30 D15 D10 Cc Cu 33 18 0.2030 0.0587 0.0309 0.0056
Material Description USCS AASHTO Greenish brown Sandy lean CLAY CL A-6(7)
0.0 0.0 20.5 6.7 30.4 36.5 5.9
Yellowish orange poorly graded SAND with Silt and Gravel
Project: Calvert Hills-College Park Flooding Mitigation Moisture content = 20.7%
Source of Sample: SWM-1 Depth: 8.0'-10.0' Sample Number: S-5
R
C
EN
T
FI
in in
1½ in in
¾ in
½ in
3/
#2
#3
#4
#6
8.7281 0.6939 0.5056 0.3356 0.2409 0.1906 0.85 3.64
0.0 0.0 0.5 1.7 15.1 43.9 38.8
Project: Calvert Hills-College Park Flooding Mitigation Moisture content = 16.0%
Source of Sample: SWM-2 Depth: 2.0'-4.0' Sample Number: S-2
R
C
EN
T
FI
in in
1½ in in
¾ in
½ in
3/
#2
#3
#4
#6
28 17 0.4594 0.2339 0.1739
Yellowish brown Clayey SAND SC A-6(1)
0.0 14.7 36.7 18.2 20.0 6.2 4.2
Yellowish orange well graded GRAVEL with Sand GW
Project: Calvert Hills-College Park Flooding Mitigation Moisture content = 14.1%
Source of Sample: SWM-2 Depth: 8.0'-10.0' Sample Number: S-5
R
C
EN
T
FI
in in
1½ in in
¾ in
½ in
3/
#2
#3
#4
#6
18.9154 7.6231 5.0359 1.9537 0.6726 0.4048 1.24 18.83
0.0 0.0 0.0 0.1 3.3 10.0 56.5 30.1
Project: Calvert Hills-College Park Flooding Mitigation Moisture content = 20.7%
Source of Sample: SWM-3 Depth: 2.0'-4.0' Sample Number: S-2
R
C
EN
T
FI
in in
1½ in in
¾ in
½ in
3/
#2
#3
#4
#6
36 25 0.0616 0.0194 0.0133 0.0050
Yellowish brown lean CLAY ML A-6(10)
0.0 20.5 38.5 10.0 15.2 9.8 6.0
Yellowish orange well graded GRAVEL with Silt and Sand
Project: Calvert Hills-College Park Flooding Mitigation Moisture content = 7.4%
Source of Sample: SWM-3 Depth: 8.0'-10.0' Sample Number: S-5
R
C
EN
T
FI
in in
1½ in in
¾ in
½ in
3/
#2
#3
#4
#6
20.7517 11.1604 7.1869 1.7765 0.3926 0.2291 1.23 48.72
Summary of Laboratory Test Results Calvert Hills Area C
Prince George's County, MD
Findling Project No.: 13-1019-23
Client Commision No.: 12131.16 pl e
ID
pl e D ep th at ur al
M oi st ur e C on te nt
Atterberg Limits
Grain Size Distribution
Modified Proctor Compaction Test
(ASTM D1557)
U
SC
S C la ss ifi ca to
LL
PL
PI GRAVEL
SAND
FINES
Max Dry Density, pcf
Optimum
Moisture Content, %
SWM-4
S-2 2.5 - 4.0 6.0
S-3 5.0 - 6.5 8.8
S-6 15.0 - 16.5 23.3 50 19 31 0 26 74 CH
S-9 30.0 - 31.5 19.3
S-11 0.0 - 1.5 26.2
SWM-5
S-1 0.0 - 1.5 20.6
S-5 10.0 - 11.5 11.2
S-7 20.0 - 21.5 22.6 67 24 43 1 48 51 CH
S-9 30.0 - 31.5 20.4
S-10 35.0 - 36.5 24.4 62 24 38 3 69 28 SC
SWM-6
S-1 0.0 - 1.5 9.1 36 18 18 6 17 77 CL
S-2 2.5 - 4.0 18.0
S-3 5.0 - 6.5 9.1 NV NP NP 21 70 9 SW-SM
S-9 30.0 - 31.5 30.3 60 27 33 4 44 52 CH
S-11 39.0 - 40.5 23.9
SWM-7
S-2 2.5 - 4.0 59.9
S-3 5.0 - 6.5 6.8
S-5 10.0 - 11.5 8.6
S-8 25.0 - 26.5 21.4 66 22 44 1 39 60 CH
S-11 38.5 - 40.0 18.9
SWM-8
S-1 0.0 - 1.5 27.8
S-2 2.5 - 4.0 6.2
S-4 7.5 - 9.0 29.3
S-7B 20.0 - 21.5 23.6
S-9 30.0 - 31.5 24.0 52 28 24 1 33 66 CH
Note: NV = Non Viscous, NP = Non Plastic
0.0 0.0 0.0 0.2 2.8 22.6 74.4
13-1019-23
RK&K
Project: Calvert Hills Area C Moisture content = 23.3%
Source of Sample: SWM-4 Depth: 15'-16.5' Sample Number: S-6
Date: 11/16/21
R
C
EN
T
FI
in in
1½ in in
¾ in
½ in
3/
#2
#3
#4
#6
50 19 0.1390
Olive grey, fat CLAY with Sand CH A-7-6(22)
0.0 0.0 1.2 1.7 18.0 27.8 51.3
Project: Calvert Hills Area C Moisture content = 22.6%
Source of Sample: SWM-5 Depth: 20'-21.5' Sample Number: S-7
R
C
EN
T
FI
in in
1½ in in
¾ in
½ in
3/
#2
#3
#4
#6
67 24 0.6035 0.1350
Dark brown, Sandy fat CLAY CH A-7-6(17)
0.0 0.0 2.5 0.6 8.7 59.2 29.0
Project: Calvert Hills Area C Moisture content = 24.4%
Source of Sample: SWM-5 Depth: 35'-36.5' Sample Number: S-10
R
C
EN
T
FI
in in
1½ in in
¾ in
½ in
3/
#2
#3
#4
#6
62 24 0.3501 0.1840 0.1511 0.0785
Light grey, Clayey SAND SC A-2-7(4)
0.0 0.0 6.2 2.1 4.7 10.4 76.6
Project: Calvert Hills Area C Moisture content = 9.1%
Source of Sample: SWM-6 Depth: 0'-1.5' Sample Number: S-1
Baltimore, Maryland
R
C
EN
T
FI
in in
1½ in in
¾ in
½ in
3/
#2
#3
#4
#6
36 18 0.3319
Dark grey, lean CLAY with SAND CL A-6(13)
Figure
0.0 0.0 21.0 15.9 39.0 15.3 8.8
Project: Calvert Hills Area C Moisture content = 9.1%
Source of Sample: SWM-6 Depth: 5'-6.5' Sample Number: S-3
R
C
EN
T
FI
in in
1½ in in
¾ in
½ in
3/
#2
#3
#4
#6
NV NP 6.1303 1.7312 1.1533 0.5438 0.2537 0.1027 1.66 16.85
Yellowish brown, well-graded SAND with Silt and Gravel SW-SM A-1-b
0.0 0.0 4.1 9.0 19.9 14.9 52.1
Project: Calvert Hills Area C Moisture content = 30.3%
Source of Sample: SWM-6 Depth: 30'-31.5' Sample Number: S-9
R
C
EN
T
FI
in in
1½ in in
¾ in
½ in
3/
#2
#3
#4
#6
60 27 1.7180 0.2274
Dark grey, Sandy fat CLAY CH A-7-6(14)
0.0 0.0 1.2 1.5 7.8 29.7 59.8
Project: Calvert Hills Area C Moisture content = 21.4%
Source of Sample: SWM-7 Depth: 25'-26.5' Sample Number: S-8
R
C
EN
T
FI
in in
1½ in in
¾ in
½ in
3/
#2
#3
#4
#6
66 22 0.3236 0.0758
Greenish grey, Sandy fat CLAY CH A-7-6(24)
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