HomeMy WebLinkAbout3191; STAGECOACH PARK; GEOTECHNICAL ENGINEERING EVALUATION REPORT; 2004-09-30September 30, 2004
Contract No. 76597
City of Carlsbad
405 Oak Avenue
Carlsbad, California 92008
Telephone: 760.434.2929
Fax: 760.720.9562
Attention: Mr. Dale A. Schuck
Subject: Geotechnical Engineering Evaluation Report
Stagecoach Park
Camino Dc Los Coches and La Costa Avenue (southwest corner)
Carlsbad, California
Dear Mr. Schuck:
This letter presents the results of our subsurface investigation and soil sampling along with
associated laboratory results for the proposed synthetic turf installation at the referenced project.
The attached Site Location Map, Figure 1, shows the location of the park in the City of Carlsbad.
The Plot Plan, Figure 2, illustrates the plan view of the park in relation to the boring locations.
- Subsurface Exploration
I The area of the proposed synthetic turf is currently covered with grass. To evaluate the
subsurface conditions, 5 soil borings were hand-augured to depths ranging from 4 to 5 feet below
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existing grade. Groundwater was not encountered in the explored depths. The subsurface
conditions encountered were observed and logged. The logs are contained in the attached
Appendix A. Soil materials encountered during the subsurface explorations consisted of fill and
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native claystones. Generalized descriptions of the encountered units are provided below.
Detailed descriptions of the soil conditions encountered are presented on the boring logs in
Appendix A.
I Fill
Fill associated with previous grading of the site was encountered in 4 of the 5 borings. The
fill generally consists of stiff silty clay. As observed in our borings, fill depth ranged between
approximately 1 to 5 feet below the existing grade and was observed to extend below the
explored depth of 5 feet.
Testing Engineers - U.S. Laboratories
7895 Convoy Court, Suite 18 • San Diego, California 92111 • (858) 715-5800 • Fax: (858) 715-5810
Offices Nationwide
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Claystone (Formational)
Native claystone deposits were observed in borings 1, 4, and 5 at depths ranging from existing
grade to 1 foot below existing grade. However, these terrace deposits are anticipated to exist
below the explored depths of other borings. These deposits consist of siltstone and clay which
were stiff in consistency.
Groundwater
Groundwater was not encountered in any of the' borings to the explored depths. However,
groundwater conditions may vary due to seasonal variations, local irrigation, land development,
and other factors.
Laboratory Testing -
Laboratory tests were performed on selected samples obtained from the borings and t aid in the
classification of the on-site soils and to evaluate their engineering characteristics. The following
tests were performed: *
Atterberg Limits
The Atterberg Limits were determined in accordance with ASTM Test Method D423 for
engineering classification of the fine-grained materials and presented in the table below:
T1!'Tto 42
Particle Size ' Percent Finer Percent Finer Distribution.
1 i r 100 - , "'100'
314 in ' . 100 '100
1/2 in 100
3/8 in . 100 100 '
#4 ' ' 100 "
100k
#10 .',' . 99 99
#20 ' 97 . . . . ' . 97
#40 . 93 .94
#60 85 91'
#100 74 87
#200 ' 62.6
'
80.5 ,
Plastic Limit 20 19
Liquid Limit 45
,
-. ' • • . '. . 46
Plasticity 25 ' ' 27 Index
USCS CL' CL Classification
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.- - 1'E-US Inc. Stagecoach Park* 76597 * October 2004
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Bori
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ng 1, 1 @ ito 4 ft , Grayish tan Clay, 113.5 17.5
(Formational). .'. . CL. '. .
"Boring 2 @ 3 to 5 ft -' Olive gray, Clay, CL
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113.0
-
-. 16.5
(Fill). . , • ' . . • - ,
-
1
4
Particle-size Distribution Tests *
An evaluation of the grain-size distribution of a selected soil sample was performed in
general accordance with the latest version of ASTM D422 (including —200 wash). These test '
results were utilized in evaluating the soil classifications in accordance, with the Unified Soil
U .Classification System. The grain-size distribution data is presented herein.
RESULTS OF SOIL CLASIFICATION TESTS
(ASTM D-1422,'D-4318, D-2487)
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- ' ' ' ' -' - '* . -. *•
1)
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. Maximum Density Tests ' ' . ' •- , '- , '. ;
4'
I . The maximum dry density and optimum moisture content of typical materials were determined
in accordance with ASTM Test Method D1557. The results of these tests are presented in the "1 '
I table below
1
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Expansion Index Tests
Expansion tests were performed on representative samples of the on-site soils (note: soil
portion passing the #4 sieve) which were remolded, surcharged 144 pounds per square foot,
and submerged in accordance with Uniform Building Code Standard No. 18-2. The test
results are summarized in the following tables.
RESULTS OF EXPANSION INDEX TESTS
(UBCNO. 18-2)
4 cation ionlnde
B-3 @ I to 4.5 ft (Fill) 99 (High)
B-2 @ I to 2.5 ft (Fill) 112 (High)
Soil Corrosivity Tests
Soluble sulfate, chloride, resistively and pH tests were performed in accordance with
California Test Methods 643, 417 and 422 to assess the degree of corrosivity of the subgrade
soils with regard to concrete and normal grade steel.
RESULTS OF CORROSIVITY TESTS
(CTM 417, CTM 422)
Sample. Boring S @ 1-
pH 6.61
Resistivity 401 (Ohm-cm)
Chloride 224 Content (ppm)
Sulfate Content 183
(ppm)
TE-US Inc.* Stagecoach Park* 76597 * October 2004
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' I Testing was performed in general accordance with applicable ASTM standards and
California Test Methods..
Limits of Investigation
Our investigation was performed using the skill and degree of care ordinarily exercised, under similar
circumstances, by reputable geotechnical engineers and geologists practicing in this or similar
localities. No other warranty, expressed or implied, is made as to the conclusions and professional
advice included in this report. This report is prepared for the sole use of our client and may not be
assigned to others without the written consent of the client and Testing Engineers-US Labs.
This report is issued with the understanding that it is the responsibility of the owner, or of his
representative, to ensure that the information contained herein are brought to the attention of the project
architect and engineer. Appropriate recommendations should be incorporated into the structural plans.
The necessary steps should be taken to see that the contractor and subcontractors carry out such
recommendations in the field.
The findings of this report are valid as of this present date. However, changes in the conditions of a
property can occur with the passage of time, whether they are due to natural processes or the works of
man on this or adjacent properties. In addition, changes in applicable or appropriate standards may
occur from legislation or the broadening of knowledge. Accordingly, the findings of this report may be
invalidated wholly or partially by changes outside of our control. Therefore, this report is subject to
review and should be updated after a period of three years.
Additional Services
The review of plans and specifications, field observations and testing under our direction is
recommended. If Testing Engineers-US Labs is not retained for these services, the client agrees to
assume our responsibility for any potential claims that may arise during construction. Observation and
testing are additional services, which are provided by our firm, and should be budgeted within the cost
of development.
We appreciate the opportunity to provide this geotechnical engineering service for your project.
Please contact our office if you have any questions concerning the content of this letter. pç
Respectfully submitted,
T esting s— SLa
lou
bs
Staff Engineering Geologist
MM/VOId
Distribution: (5) Addressee
fl'af Ho. C40076
No. GE-253
1(9 6P. 8/30/06
%X*Vct RCEIRGE
Van Olin, GE 257 OF CA.\
Geotechnical Division Mananer
*
TE-US Inc.*Stagecoach Park 76597 * October 2004
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Illustrations
TE-US Inc.* Stagecoach Park* 76597 * October 2004
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SCALE 1:24000
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NOTE: This figure may contain areas of color. TE-U.S. Labs cannot be
responsible for any subsequent misinterpretation of the information result-
ing from black and white reproductions of this figure.
- - -
Testing Engineers - U.S. Labs - - 7895 Convoy Court, Suite 18
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San Diego, CA 92111 - -
-
Title: -
• . Site Location
Project. Carlsbad-Stagecoach Park
Orwn: - Contract No: MM, - 73779
Date: September, 2004 Figure No: 1
No =
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GRAPHIC SCALE
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IN
FEET
1 I,,h - 60 ft.
Boring Location (approx.)
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Testing Engineers - U.S. Labs
7895 Convoy Court, Suite 18
111110309m San Diego, CA 92111
Title: Plot Plan
Project: Carlsbad-Stagecoach Park
Drwn: Contract No: MM 73779
Date: September, 2004 Figure No:
0 1
Appendix A
Borings Logs
TE-US Inc.* Stagecoach Park* 76597 * October 2004
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GENERAL NOTES
SAMPLE IDENTIFICATION
The Unified Soil Classification System is used to identify the soil unless otherwise noted.
SOIL PROPERTY SYMBOLS
N: Standard "N' penetration: Blows per foot of a 140 pound hammer falling 30 inches on a 2-inch O.D. split-
spoon.
Qu: Unconfined compressive strength, tsf.
Qp: Penetrometer value, unconfined compressive strength, tsf.
Mc: Water content, %.
LL: Liquid limit, %.
P1: Plasticity index, %.
DD: Natural dry density, PCF.
': Apparent groundwater level at time noted after completion.
DRILLING AND SAMPLING SYMBOLS
H CAL: Modified California Sampler'- 2 5/8" ID., 3.0" O.D., except where noted.
SS: Split-Spoon - 13/8" I.D., 2" O.D., except where noted.
BULK: Bulk sample.
DB: Diamond Bit.
CB: Carbide Bit.
WS: Washed Sample.
RELATIVE DENSITY AND CONSISTENCY CLASSIFICATION
TERM (NON-COHESIVE SOILS) STANDARD PENETRATION RESISTANCE (SPT)
Very Loose 0to4
Loose 4to10
Medium Dense 11 to 30
Dense 31 to 50
Very Dense Over 50
TERM (COHESIVE SOILS) SPT OU - (TSF)
Very Soft 0 to 2 0 -0.25
Soft 2 to 4 0.25-0.50
Medium Stiff 4to8 0.50-1.00
Stiff 8to16 1.00-2.00
Very Stiff 16 to 32 2.00-4.00
Hard Over 32 4.00+
PARTICLE SIZE
Boulders 12 in. + Coarse Sand 5mm-0.6rnm Silt 0.074 mm-0.005rnm
Cobbles 12 in -3.in Medium Sand 0.6mm-0.2mm Clay - 0.005mm
Gravel 3 in -5mm Fine Sand 0.2mm-0.074mm ri
TE-US Inc.* Stagecoach Park* 76597 * October 2004
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DATE DRILLED 8/2/04 BORING NO. B-I
GROUND ELEVATION 213'± SHEET I OF
METHOD DRILLING Hand Auger
LOGGED BY MM DRIVE WEIGHT N/A DROP N/A
DESCRIPTION
- TOPSOIL:
ND wl trace clay
wn, moist to wet, loose.
\ LRootlets.
CL
FILL: \ Sandy CLAY
\ Grayish brown, moist, stiff.
Mottled iron-oxide staining.
- .
CL
FORMATIONAL:
CLAYSTONE
Grayish tan, damp, stiff to very stiff.
Iron-oxide staining.
Total Depth 4.0 feet
Groundwater not encountered
Backfihled on 8/2/04
Testing Engineers - U.S. Labs 1
7895 Convoy Court, Suite 18
San Diego, CA 92111
BORING LOG
cit f_ y o__ Park
Carlsbad, California
CONTRACT NO.
76597
REPORT DATE
August, 2004
FIGURE
A-i
m
DATE DRILLED 8/2/04 BORING NO. B-3
• GROUND ELEVATION 209'± SHEET I OF
CD METHOD DRILLING Hand Auger I (1)
>- 5 LOGGED BY MM DRIVE WEIGHT N/A DROP N/A
Co m
Cl) Cl)
0
DESCRIPTION
TOPSOIL:
3inches - -
CL \ Silty SAND
I Dark brown, wet, loose.
FILL:
- Silty CLAY -
Grayish tan, moist, stiff.
Mottled, clots of Clay.
Total Depth = 4.5 feet
- Groundwater not encountered
5 ii - - Backfilled on 8/2/04
10 ---- • -- ________________________
BORING LOG Testing Engineers - U.S. Labs City of Carlsbad - Stagecoach Park 3 7895 Convoy Court, Suite 18 Carlsbad, California
CONTRACT NO. REPORT DATE FIGURE San Diego, CA 92111
August, 2004 A-3
£2' Z DATE DRILLED 8/2/04 BORING NO. B-4 -..-J - 0
GROUND ELEVATION 210'± SHEET I OF
METHOD DRILLING Hand Auger
2i u-
£5 LOGGED BY MM DRIVE WEIGHT N/A DROP N/A
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a DESCRIPTION
-
TOPSOIL:
\ 3 inches CL FILL:
CLAY
Dark brown, moist, stiff.
Rootlets, clots of greenish Siltstone.
CL FORMATIONAL:
CLAYSTONE
Greenish tan, damp, stiff.
Total Depth = 4.0 feet
Groundwater not encountered
Backfihled on 8/2/04
5L
10 Q____
BORING LOG Testing Engineers - U.S. Labs City of Carlsbad - Stagecoach Park 7895 Convoy Court, Suite 18 Carlsbad, California
________ San Diego, CA 92111 CONTRACT NO. REPORT DATE FIGURE IIIIE 76597 August, 2004 1 A-4
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W a-(I)
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D (I)
>-
________
>- 5
(1)
DATE DRILLED 8/2/04 BORING NO. B-5
GROUND ELEVATION 213± SHEET 1 OF
METHOD DRILLING Hand Auger
LOGGED BY MM DRIVE WEIGHT N/A DROP N/A
DESCRIPTION
—i—'
TOPSOIL:
4inches
CL \ Silty SAND w/ trace Clay
Abundant rootlets.
FORMATIONAL:
— - CLAYSTONE
Dark brown, moist, stiff.
Rootlets.
Total Depth = 3.5 feet
Groundwater not encountered
— - - Backfilled on 8/2/04
5L
Testing Engineers - U.S. Labs BORING LOG
City of Carlsbad - Stagecoach Park 7895 Convoy Court, Suite 18 Carlsbad, California
CONTRACT NO. REPORT DATE FIGURE MEMEMM San Diego, CA 92111
5 •IU.L 76597 August, 2004 A-5