HomeMy WebLinkAboutHOMESTEAD AT CLARENDON HILLS - PDP190007 - SUBMITTAL DOCUMENTS - ROUND 1 - GEOTECHNICAL (SOILS) REPORTMarch 12, 2019
Kenneth R. Mitchell (kmitch2000@gmail.com)
1021 Nightingale Drive
Fort Collins, Colorado. 80525
Re: Percolation Testing Results
Clarendon Hills
Fort Collins, Colorado
EEC Project No. 18-01-197
Mr. Mitchell:
As requested and in accordance with our proposal dated February 13, 2019, Earth
Engineering Company, Inc. (EEC) personnel have completed the percolation testing
services for the referenced project. We understand this project involves the development
of eight residential lots at the Clarendon Hills subdivision and the installation of stormwater
detention basins may be needed. The purpose of the percolation testing is to provide water
absorption data for use by others in the stormwater absorption analysis for the referenced
project.
On February 19 and 20, 2019, EEC personnel completed the percolation testing at the three
sites you requested for the above referenced project. To complete the site percolation
testing, EEC personnel advanced three (3) percolation test holes at each of the three sites
tested. The percolation test holes were advanced to depths of approximately 4 to 7½ feet
below grade, which corresponded to slightly above bedrock level, near bedrock level and
slightly below bedrock level in order to evaluate the absorption characteristics both above
and below the bedrock level at each site. After the percolation test holes had presoaked for
approximately 24 hours, EEC personnel returned to the site to perform the percolation test
in the boreholes. The results of the percolation testing and logs of the test borings are
included with this report.
The materials encountered in the test borings at the percolation test sites generally consisted
of brown sandy lean clay soils with varying amounts of gravel underlain by brown
sandstone bedrock at depths of approximately 3½ to 5 feet below present site grades which
extended to the depths explored. At the time of drilling, no groundwater was observed in
the test borings.
DRILLING AND EXPLORATION
DRILLING & SAMPLING SYMBOLS:
SS: Split Spoon - 13/8" I.D., 2" O.D., unless otherwise noted PS: Piston Sample
ST: Thin-Walled Tube - 2" O.D., unless otherwise noted WS: Wash Sample
R: Ring Barrel Sampler - 2.42" I.D., 3" O.D. unless otherwise noted
PA: Power Auger FT: Fish Tail Bit
HA: Hand Auger RB: Rock Bit
DB: Diamond Bit = 4", N, B BS: Bulk Sample
AS: Auger Sample PM: Pressure Meter
HS: Hollow Stem Auger WB: Wash Bore
Standard "N" Penetration: Blows per foot of a 140 pound hammer falling 30 inches on a 2-inch O.D. split spoon, except where noted.
WATER LEVEL MEASUREMENT SYMBOLS:
WL : Water Level WS : While Sampling
WCI: Wet Cave in WD : While Drilling
DCI: Dry Cave in BCR: Before Casing Removal
AB : After Boring ACR: After Casting Removal
Water levels indicated on the boring logs are the levels measured in the borings at the time indicated. In pervious soils, the indicated
levels may reflect the location of ground water. In low permeability soils, the accurate determination of ground water levels is not
possible with only short term observations.
DESCRIPTIVE SOIL CLASSIFICATION
Soil Classification is based on the Unified Soil Classification
system and the ASTM Designations D-2488. Coarse Grained
Soils have move than 50% of their dry weight retained on a
#200 sieve; they are described as: boulders, cobbles, gravel or
sand. Fine Grained Soils have less than 50% of their dry weight
retained on a #200 sieve; they are described as : clays, if they
are plastic, and silts if they are slightly plastic or non-plastic.
Major constituents may be added as modifiers and minor
constituents may be added according to the relative
proportions based on grain size. In addition to gradation,
coarse grained soils are defined on the basis of their relative in-
place density and fine grained soils on the basis of their
consistency. Example: Lean clay with sand, trace gravel, stiff
(CL); silty sand, trace gravel, medium dense (SM).
CONSISTENCY OF FINE-GRAINED SOILS
Unconfined Compressive
Strength, Qu, psf Consistency
< 500 Very Soft
500 - 1,000 Soft
1,001 - 2,000 Medium
2,001 - 4,000 Stiff
4,001 - 8,000 Very Stiff
8,001 - 16,000 Very Hard
RELATIVE DENSITY OF COARSE-GRAINED SOILS:
N-Blows/ft Relative Density
0-3 Very Loose
4-9 Loose
10-29 Medium Dense
30-49 Dense
50-80 Very Dense
80 + Extremely Dense
PHYSICAL PROPERTIES OF BEDROCK
DEGREE OF WEATHERING:
Slight Slight decomposition of parent material on
joints. May be color change.
Moderate Some decomposition and color change
throughout.
High Rock highly decomposed, may be extremely
broken.
HARDNESS AND DEGREE OF CEMENTATION:
Group
Symbol
Group Name
Cu≥4 and 1<Cc≤3
E GW Well-graded gravel
F
Cu<4 and/or 1>Cc>3
E GP Poorly-graded gravel
F
Fines classify as ML or MH GM Silty gravel
G,H
Fines Classify as CL or CH GC Clayey Gravel
F,G,H
Cu≥6 and 1<Cc≤3
E SW Well-graded sand
I
Cu<6 and/or 1>Cc>3
E SP Poorly-graded sand
I
Fines classify as ML or MH SM Silty sand
G,H,I
Fines classify as CL or CH SC Clayey sand
G,H,I
inorganic PI>7 and plots on or above "A" Line CL Lean clay
K,L,M
PI<4 or plots below "A" Line ML Silt
K,L,M
organic Liquid Limit - oven dried Organic clay
K,L,M,N
Liquid Limit - not dried Organic silt
K,L,M,O
inorganic PI plots on or above "A" Line CH Fat clay
K,L,M
PI plots below "A" Line MH Elastic Silt
K,L,M
organic Liquid Limit - oven dried Organic clay
K,L,M,P
Liquid Limit - not dried Organic silt
K,L,M,O
Highly organic soils PT Peat
(D30)2
D10 x D60
GW-GM well graded gravel with silt NPI≥4 and plots on or above "A" line.
GW-GC well-graded gravel with clay OPI≤4 or plots below "A" line.
GP-GM poorly-graded gravel with silt PPI plots on or above "A" line.
GP-GC poorly-graded gravel with clay QPI plots below "A" line.
SW-SM well-graded sand with silt
SW-SC well-graded sand with clay
SP-SM poorly graded sand with silt
SP-SC poorly graded sand with clay
Silts and Clays
Liquid Limit 50 or
more
CGravels with 5 to 12% fines required dual symbols:
Kif soil contains 15 to 29% plus No. 200, add "with sand"
or "with gravel", whichever is predominant.
<0.75 OH
Primarily organic matter, dark in color, and organic odor
ABased on the material passing the 3-in. (75-mm)
sieve
CLARENDON VILLAGE
PRELIMINARY
FORT COLLINS, CO
EEC PROJECT No. 18-01-197
FEBRUARY 2019
CLARENDON VILLAGE PRELIMINARY PERCOLATION TESTS
FORT COLLINS, COLORADO
PROJECT NO: 18-01-197 DATE: FEBRUARY 2019
LOG OF TEST HOLE #1 (EAST TEST SITE)
RIG TYPE: CME55 SHEET 1 OF 1 WATER DEPTH
FOREMAN: SM START DATE 2/19/2019 WHILE DRILLING None
AUGER TYPE: 4" CFA FINISH DATE 2/19/2019 24 HOUR N/A
SPT HAMMER: AUTO SURFACE ELEV N/A 7 DAYS N/A
SOIL DESCRIPTION D N QU MC DD A-LIMITS -200 SWELL
TYPE (FEET) (BLOWS/FT) (PSF) (%) (PCF) LL PI (%) PRESSURE % @ 500 PSF
_ _
SANDY LEAN CLAY (CL) 1
brown _ _
very stiff 2
silty with gravel _ _
3
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4
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5
SANDSTONE _ _
grey/tan/rust 6
clayey _ _
poorly cemented 7
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7.5' BOTTOM OF TEST HOLE 8
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CLARENDON VILLAGE PRELIMINARY PERCOLATION TESTS
FORT COLLINS, COLORADO
PROJECT NO: 18-01-197 DATE: FEBRUARY 2019
LOG OF TEST HOLE #2 (EAST TEST SITE)
RIG TYPE: CME55 SHEET 1 OF 1 WATER DEPTH
FOREMAN: SM START DATE 2/22/2019 WHILE DRILLING None
AUGER TYPE: 4" CFA FINISH DATE 2/22/2019 24 HOUR N/A
SPT HAMMER: AUTO SURFACE ELEV N/A 7 DAYS N/A
SOIL DESCRIPTION D N QU MC DD A-LIMITS -200 SWELL
TYPE (FEET) (BLOWS/FT) (PSF) (%) (PCF) LL PI (%) PRESSURE % @ 500 PSF
_ _
SANDY LEAN CLAY (CL) 1
brown _ _
very stiff 2
silty with gravel _ _
3
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SANDSTONE 4
grey/tan/rust _ _
poorly cemented, clayey 5
5' BOTTOM OF TEST HOLE _ _
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CLARENDON VILLAGE PRELIMINARY PERCOLATION TESTS
FORT COLLINS, COLORADO
PROJECT NO: 18-01-197 DATE: FEBRUARY 2019
LOG OF TEST HOLE #3 (EAST TEST SITE)
RIG TYPE: CME55 SHEET 1 OF 1 WATER DEPTH
FOREMAN: SM START DATE 2/22/2019 WHILE DRILLING None
AUGER TYPE: 4" CFA FINISH DATE 2/22/2019 24 HOUR N/A
SPT HAMMER: AUTO SURFACE ELEV N/A 7 DAYS N/A
SOIL DESCRIPTION D N QU MC DD A-LIMITS -200 SWELL
TYPE (FEET) (BLOWS/FT) (PSF) (%) (PCF) LL PI (%) PRESSURE % @ 500 PSF
_ _
SANDY LEAN CLAY (CL) 1
brown _ _
very stiff 2
silty with gravel _ _
3
3' BOTTOM OF TEST HOLE _ _
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CLARENDON VILLAGE PRELIMINARY PERCOLATION TESTS
FORT COLLINS, COLORADO
PROJECT NO: 18-01-197 DATE: FEBRUARY 2019
LOG OF TEST HOLE #1 (MIDDLE TEST SITE)
RIG TYPE: CME55 SHEET 1 OF 1 WATER DEPTH
FOREMAN: SM START DATE 2/22/2019 WHILE DRILLING None
AUGER TYPE: 4" CFA FINISH DATE 2/22/2019 24 HOUR N/A
SPT HAMMER: AUTO SURFACE ELEV N/A 7 DAYS N/A
SOIL DESCRIPTION D N QU MC DD A-LIMITS -200 SWELL
TYPE (FEET) (BLOWS/FT) (PSF) (%) (PCF) LL PI (%) PRESSURE % @ 500 PSF
_ _
SANDY LEAN CLAY (CL) 1
brown _ _
very stiff 2
silty with gravel _ _
3
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4
SANDSTONE _ _
grey/tan/rust 5
poorly cemented _ _
clayey 6
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6.5' BOTTOM OF TEST HOLE 7
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CLARENDON VILLAGE PRELIMINARY PERCOLATION TESTS
FORT COLLINS, COLORADO
PROJECT NO: 18-01-197 DATE: FEBRUARY 2019
LOG OF TEST HOLE #1 (MIDDLE TEST SITE)
RIG TYPE: CME55 SHEET 1 OF 1 WATER DEPTH
FOREMAN: SM START DATE 2/22/2019 WHILE DRILLING None
AUGER TYPE: 4" CFA FINISH DATE 2/22/2019 24 HOUR N/A
SPT HAMMER: AUTO SURFACE ELEV N/A 7 DAYS N/A
SOIL DESCRIPTION D N QU MC DD A-LIMITS -200 SWELL
TYPE (FEET) (BLOWS/FT) (PSF) (%) (PCF) LL PI (%) PRESSURE % @ 500 PSF
_ _
SANDY LEAN CLAY (CL) 1
brown _ _
very stiff 2
silty with gravel lenses _ _
3
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4
SANDSTONE _ _
grey/tan/rust, poorly cemented, clayey 5
5' BOTTOM OF TEST HOLE _ _
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CLARENDON VILLAGE PRELIMINARY PERCOLATION TESTS
FORT COLLINS, COLORADO
PROJECT NO: 18-01-197 DATE: FEBRUARY 2019
LOG OF TEST HOLE #1 (MIDDLE TEST SITE)
RIG TYPE: CME55 SHEET 1 OF 1 WATER DEPTH
FOREMAN: SM START DATE 2/22/2019 WHILE DRILLING None
AUGER TYPE: 4" CFA FINISH DATE 2/22/2019 24 HOUR N/A
SPT HAMMER: AUTO SURFACE ELEV N/A 7 DAYS N/A
SOIL DESCRIPTION D N QU MC DD A-LIMITS -200 SWELL
TYPE (FEET) (BLOWS/FT) (PSF) (%) (PCF) LL PI (%) PRESSURE % @ 500 PSF
_ _
SANDY LEAN CLAY (CL) 1
brown _ _
very stiff 2
silty with gravel lenses _ _
3
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4' BOTTOM OF TEST HOLE _ _
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CLARENDON VILLAGE PRELIMINARY PERCOLATION TESTS
FORT COLLINS, COLORADO
PROJECT NO: 18-01-197 DATE: FEBRUARY 2019
LOG OF TEST HOLE #1 (WEST TEST SITE)
RIG TYPE: CME55 SHEET 1 OF 1 WATER DEPTH
FOREMAN: SM START DATE 2/22/2019 WHILE DRILLING None
AUGER TYPE: 4" CFA FINISH DATE 2/22/2019 24 HOUR N/A
SPT HAMMER: AUTO SURFACE ELEV N/A 7 DAYS N/A
SOIL DESCRIPTION D N QU MC DD A-LIMITS -200 SWELL
TYPE (FEET) (BLOWS/FT) (PSF) (%) (PCF) LL PI (%) PRESSURE % @ 500 PSF
_ _
SANDY LEAN CLAY (CL) 1
brown _ _
very stiff 2
silty with gravel _ _
3
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4
SANDSTONE _ _
grey/tan/rust 5
poorly cemented _ _
clayey 6
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6.5' BOTTOM OF TEST HOLE 7
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CLARENDON VILLAGE PRELIMINARY PERCOLATION TESTS
FORT COLLINS, COLORADO
PROJECT NO: 18-01-197 DATE: FEBRUARY 2019
LOG OF TEST HOLE #2 (WEST TEST SITE)
RIG TYPE: CME55 SHEET 1 OF 1 WATER DEPTH
FOREMAN: SM START DATE 2/22/2019 WHILE DRILLING None
AUGER TYPE: 4" CFA FINISH DATE 2/22/2019 24 HOUR N/A
SPT HAMMER: AUTO SURFACE ELEV N/A 7 DAYS N/A
SOIL DESCRIPTION D N QU MC DD A-LIMITS -200 SWELL
TYPE (FEET) (BLOWS/FT) (PSF) (%) (PCF) LL PI (%) PRESSURE % @ 500 PSF
_ _
SANDY LEAN CLAY (CL) 1
brown _ _
very stiff 2
silty with gravel _ _
3
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4
SANDSTONE _ _
grey/tan/rust, poorly cemented, clayey 5
5' BOTTOM OF TEST HOLE _ _
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CLARENDON VILLAGE PRELIMINARY PERCOLATION TESTS
FORT COLLINS, COLORADO
PROJECT NO: 18-01-197 DATE: FEBRUARY 2019
LOG OF TEST HOLE #3 (WEST TEST SITE)
RIG TYPE: CME55 SHEET 1 OF 1 WATER DEPTH
FOREMAN: SM START DATE 2/22/2019 WHILE DRILLING None
AUGER TYPE: 4" CFA FINISH DATE 2/22/2019 24 HOUR N/A
SPT HAMMER: AUTO SURFACE ELEV N/A 7 DAYS N/A
SOIL DESCRIPTION D N QU MC DD A-LIMITS -200 SWELL
TYPE (FEET) (BLOWS/FT) (PSF) (%) (PCF) LL PI (%) PRESSURE % @ 500 PSF
_ _
SANDY LEAN CLAY (CL) 1
brown _ _
very stiff 2
silty with gravel _ _
3
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4' BOTTOM OF TEST HOLE _ _
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ECu=D60/D10 Cc=
HIf fines are organic, add "with organic fines" to
group name
LIf soil contains ≥ 30% plus No. 200 predominantly sand,
add "sandy" to group name.
MIf soil contains ≥30% plus No. 200 predominantly gravel,
add "gravelly" to group name.
DSands with 5 to 12% fines require dual symbols:
BIf field sample contained cobbles or boulders, or
both, add "with cobbles or boulders, or both" to
group name. FIf soil contains ≥15% sand, add "with sand" to
Unified Soil ClaSSifiCation SyStem
Soil Classification
Criteria for Assigning Group Symbols and Group Names Using Laboratory Tests
Sands 50% or more
coarse fraction
passes No. 4 sieve
Fine-Grained Soils
50% or more passes
the No. 200 sieve
<0.75 OL
Gravels with Fines
more than 12%
fines
Clean Sands Less
than 5% fines
Sands with Fines
more than 12%
fines
Clean Gravels Less
than 5% fines
Gravels more than
50% of coarse
fraction retained on
No. 4 sieve
Coarse - Grained Soils
more than 50%
retained on No. 200
sieve
Silts and Clays
Liquid Limit less
than 50
IIf soil contains >15% gravel, add "with gravel" to
group name
JIf Atterberg limits plots shaded area, soil is a CL-
ML, Silty clay
GIf fines classify as CL-ML, use dual symbol GC-
CM, or SC-SM.
0
10
20
30
40
50
60
0 10 20 30 40 50 60 70 80 90 100 110
PLASTICITY INDEX (PI)
LIQUID LIMIT (LL)
ML OR OL
MH OR OH
For Classification of fine-grained soils and
fine-grained fraction of coarse-grained
soils.
Equation of "A"-line
Horizontal at PI=4 to LL=25.5
then PI-0.73 (LL-20)
Equation of "U"-line
Vertical at LL=16 to PI-7,
then PI=0.9 (LL-8)
CL-ML
Limestone and Dolomite:
Hard Difficult to scratch with knife.
Moderately Can be scratched easily with knife.
Hard Cannot be scratched with fingernail.
Soft Can be scratched with fingernail.
Shale, Siltstone and Claystone:
Hard Can be scratched easily with knife, cannot be
scratched with fingernail.
Moderately Can be scratched with fingernail.
Hard
Soft Can be easily dented but not molded with
fingers.
Sandstone and Conglomerate:
Well Capable of scratching a knife blade.
Cemented
Cemented Can be scratched with knife.
Poorly Can be broken apart easily with fingers.
Cemented
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