HomeMy WebLinkAboutCT 04-26; ROBERTSON RANCH PA 16, 17 & 18; PAVEMENT DESIGN REPORT;Geotechnical . Geologic . Coastal . Environmental
5741 Palmer Way • Carlsbad, California 92010 • (760) 438-3155 • FAX (760) 931-0915 . www.geosoilsinc.com
March 16, 2011
W.O. 5949-E-SC
Brookfield San Diego Builders, Inc.
12865 Pointe Del Mar, Suite 200
Del Mar, California 92014
Attention: Mr. Greg McDonnell
Subject: Pavement Design Report, North Fork Avenue (Stations 101" to 18+00) and
Cascade Street (Stations 10+00 to 12+"), Portion of Planning Area 16 of
Robertson Ranch, Carlsbad, San Diego County, California
Dear Mr. McDonnell: -
In accordance with your request, GeoSoils, Inc. (GSI) has prepared this supplemental
pavement design report for asphalt concrete (AC) pavement at the subject site. This report
also includes alternative recommendations for the use of subgrade enhancement
geotextiles (SEG's), if desired. The scope of services provided in preparation of this report
include a review of the referenced reports and documents (see the Appendix), an
evaluation of the pavement section for the subject area, and preparation of this report.
PAVEMENT DESIGN
Pavement section evaluation was based on traffic index (TI) values provided by O'Day
Consultants (improvement plans). Pavement sections were evaluated in general
accordance with the California Department of Transportation (Caltrans) Highway Design
Manual of Instructions and the City of Carlsbad Standard Drawings (see the Appendix).
Pavement sections presented are based on the aforementioned criteria and resistance
value (R-value) data (see the attached Figures 1 through 3), evaluated from soils exposed
at, or near, final subgrade elevations within the subject areas. R-value testing was
performed in general accordance with the latest revisions to the Department of
Transportation, State of California, Material & Research Test Method No. 301. The
collection of representative subgrade samples was perforemed by a representative from
this office and under the supervision of the City inspector.
C3•
ASPHALT CONCRETE PAVEMENT
Structural Section
Traffic Indices (TI) were provided by the project civil engineer (O'Day Consultants, 2006)
as 5.0 for the subject traffic areas. A-values (see attached Figures 1 through 3) ranging
from 13 to 17 were evaluated' for representative subgráde soils onsite and used in
pavement design.
In addition to a standard asphalt over aggregate base pavement section, an alternative
section, using SEG's per Section 614.5 of the Highway Design Manual (State of California,
2008), and the State of California (2009). The recommended pavement sections, provided
in general accordance with the City guidelines (City of Carlsbad, 1993), and the State of
California (2008, 2009), are presented as follows:
Standard Pavement Section: Asphalt/Aggregate Base
I
LW AC'? B1
I ZAPPROXIMATE TI(1) SUBGRADE THIKNE S 4J
-, i TRAFFIC AREA - , R-VALUE ( / (Inches
Cascade Street, Sta. 10 to 12 (Sample
obtained from Sta. 10) 5.0 14 4.0 6.0 /
1
North Fork Avenue, Sta. 10 to 14+00
(Sample obtained from Sta. 13) 5.0 13 4.0 6.0
North' Fork Avenue, Sta. 14 to 18+22
(Sample obtained from Sta. 16+—n 5.0 17 4.0 6.0
Per O'Day Consultants (Improvement plans)
Per Carlsbad (1993)
Denotes Class 2 Aggregate Base H >78, SE >25)
City Of Carlsbad
SHOP DRAWING REVIEW
The
PPW renyshoperwotcdra1ng(erof any drawing of the Con&acto's plaid or equipment) shall not in any way
be deemed to release the Contractor from M re ponsi1*lty for
complete and accurate pei.anoo of the Vit In eccoidance wW
the Contract Drmvtngs and Spedflcatlons. Neither shall such
approval release the Contractor form any labWty placed swon 1*0
byp onofCoo"
C3 it: O .NSI.AMENDANDRESUBMI1' - - ç3: .IIS.S.MAKE CORRECTIONS NOTED
NO EXCEPTIONS TAKEN
Brookfield San Diego Builders, Inc. W.O. 5949-E-SC
Portion of Planning Area 16, Robertson Ranch March 16, 2011
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GeoSoils, Inc.
Alternative Pavement Section: Subgrade Enhancement Geotextile (SEG)
:• TABLE 2 ASPHALT!C CONCRETE (A.C.)/AGGREGATE BASE(A.B.)/SEGY
O)CMATE gUBGF : TI' THICKNESS THICKNESS (CalTrans
Cascade Street, Sta. 10 to
12 (Sample obtained from 5.0 20 4.0 Bi, -
Sta. 10)
North Fork Avenue, Sta. 1O
to 14 (Sample obtained 5.0 20 4.0 Bi, 1325 . i
from Sta. 13)
North Fork Avenue, Sta. 14
to 18 (Sample obtained from 5.0 20 4.0 5.0 Bi, B25 /
Sta. 16)
Per O'Day Consultants, (Improvement plans)
Effective R-value when using SEG HP 570, or equivalent (State of California, 2008, 2009)
Per Carlsbad (1993)
Denotes Class 2 Aggregate Base R >78, SE >25)
Class B1, Mirafi HP 570, or equivalent; Class B2, Mirafi FW500, or equivalent
This alternative includes design pavement sections using SEG's per Section 614.5 of the
Highway Design Manual (State of California, 2008), and the State of California (2009).
Subgrade enhancement geotextile (SEG) used shall be either Mirafi HP 570 (Class Bi), or
FW500 (Class 132), or equivalent. All SEG's shall be placed per the manufacturers
guidelines.
General Installation Considerations
All pavement installation, including preparation and compaction of subgrade, compaction
of base material, and placement and rolling of asphaltic concrete, shall be done in
accordance with the City guidelines, and under the observation and testing of the project
geotechnical engineer and/or the City. .
The recommended pavement sections are meant as minimums. If thinner or highly
variable pavement sections are constructed, increased maintenance and repair may be
needed. The recommended pavement sections provided above are intended as a
minimum guideline. If thinner or highly variable pavement sections are 'constructed,
increased maintenance and repair could be expected. If the ADT (average daily traffic) or
ADTT (average daily truck traffic) increases beyond that intended, as reflected by the TI
used for design, increased maintenance and repair could be required for the pavement
section. Consideration should be given to theincreased potential for distress from overuse
Brookfield San Diego Builders, Inc.
Portion of Planning Area 16, Robertson Ranch
FiIe:e:wp9\5900\5949e.pdr4
p
CeoSoiis Inc.
W.O. 5949-E-SC
March 16, 2011
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of paved street areas by heavy equipment and/or construction related heavy traffic
(e.g., concrete trucks, loaded supply trucks, etc.), particularly when the final section is not
in place (i.e., topcoat). Best management construction practices should be followed at all
times, especially during inclement weather.
PAVEMENT GRADING RECOMMENDATIONS
General
All section changes shall be properly transitioned. If adverse conditions are encountered
during the preparation of subgrade materials, special construction methods may need to
be employed. A GSI representative shall be present for the preparation of subgrade, base
rock, and asphalt concrete.
Subgrade
Within street and parking areas, all surficial deposits of loose soil material shall be removed
and recompacted as recommended. After the loose soils are removed, the bottom is to
be scarified to a depth of at least 12 inches, moisture conditioned as necessary, and
compacted to 95 percent of the maximum laboratory density, as determined by ASTM test
designation D 1557. .
Deleterious material, excessively wet or dry pockets,, concentrated zones of oversized rock
fragments, and any other unsuitable materials encountered during grading shall be
removed. The compacted fill-material shall then be brought to the elevation of the
proposed subgrade for the pavement. The subgrade shall be proof-rolled in order to
ensure a uniform firm and unyielding surface. All grading and fill placement shall be
observed by the project soil engineer and/or his representative.
Base Rock
Compaction tests are required for the recommended base section. Minimum relative
compaction required will be 95 percent of the laboratory maximum density as determined
by ASTM test designation D 1557. Base aggregate shall be in accordance with
Section 26 of Caltrans Standard specifications (California Department of Transportation,
2006), for Caltrans Class 2 aggregate base.
Paving
Prime coat may be omitted if all of the following conditions are met:
1. The asphalt pavement layer is placed within two weeks of completion of base
and/or subbase course.
Brookfield San Diego Builders, Inc. . W.O. 5949-E-SC
Portion of Planning Area 16, Robertson Ranch March 16, 2011
File:e:\wp9\5900\5949e.pdr4 Page 4
GeoSoils, Inc.
Traffic is not routed over completed base before paving.
Construction is completed during the dry season of May through October.
The base is kept free of debris prior to placement of asphaltic concrete.
If construction is performed during the wet season of November through April, prime coat
may be omitted if no rain occurs between completion of base course and paving and the
time between completion of base and paving is reduced to three days, provided the base
is free of loose soil or debris. Where prime coat has been omitted and rain occurs, traffic
is routed over base course, or paving is delayed, measures shall be taken to restore base
course and subgrade to conditions that will meet specifications as directed by the
geotechnical consultant.
Drainage
Positive drainage shall be providedfor all surface water to drain toward the curb and
gutter, or to an approved drainage channel. Positive site drainage shall be maintained at
all times. Water shall not be allowed to pond or seep into the ground. Over-watering of
landscape areas should be avoided. Due to the low R-values, wet subgrade conditions
could significantly reduce the life of the pavement. Therefore, it is imperative that sübgrade
materials are not allowed to become wet or saturated or allow water to flow into trenches
or behind curbs.
OTHER DESIGN PROFESSIONALS/CONSULTANTS
The design civil engineer shall review the recommendations provided herein, incorporate
those recommendations into their plans, and by explicit reference, make this report part
of their project plans.
LIMITATIONS
The materials encountered on the project site and utilized for our analysis are believed
representative of the area; however, soil and bedrock materials vary in character between
excavations and natural outcrops or conditions exposed during mass grading. Site
conditions may vary due to seasonal changes or other factors.
Inasmuch as our study is based upon our review and engineering analyses and laboratory
data, the conclusions and recommendations are professional opinions. These opinions
have been derived in accordance with current standards of practice, and no warranty is
express or implied. Standards of practice are subject to change with time. GSI assumes
no responsibility or liability for work or testing performed by others, or their inaction, or
Brookfield San Diego Builders, Inc. W.O. 5949-E-SC
Portion of Planning Area 16, Robertson Ranch March 16, 2011
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GeoSoils, Inc.
work performed when GSI is not requested to be onsite, to evaluate if our
recommendations have been properly implemented. Use of this report constitutes an
agreement and consent by the user to all the limitations outlined above, notwithstanding
any other agreements that may be in place. In addition, this report may be subject to
review by the controlling authorities.
The opportunity to be of service is greatly appreciated. If you have any questions, please
do not hesitate to call our office.
Respectfully submitted
GeoSoils, Inc.
i3c -4
Certfd ) \ 's, E n g In. a cr i
'lei
?o~bert G. Crisman
\'\G
''OFCp /
Engineering Geologist, EG-493(
Exp. bli
,4ndrew T. Guatelli
Geotechnical Engineer, GE 2320
RGC/ATG/JPF/jh
Attachments: Figures 1 through 3 - A-value Test Results
Appendix - References
Distribution: (4) Addressee
Brookfield San Diego Builders, Inc. W.O. 5949-E-SC
Portion of Planning Area 16, Robertson Ranch March 16, 2011
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CeoSoils, Inc.
Traffic index, assumed 5.0
Gravel equivalent factor, assumed 1.25
Expansion, stability equilibrium 0.93
R-Value by expansion 27
R-Value by exudation 13
R-Value at equilibrium 13
Expansion, Stability Equilibrium
2.00
1.50
.0 Ca
U)
.0
(0 1.00
0.50
0.001/1111 I 1 11 I'll I I 1 1-4
0.00 0.50 1.00 1.50 2.00
Cover Thickness by Expansion Pressure (ft)
TEST SPECIMEN A B C D
Compactor air pressure PSI 350 250 150
Water added % 3.7 5.2 6.2
Moisture at compaction 13.0 14.5 15.5
Height of sample IN 2.48 2.53 2.57
Dry density PCF 121.2 117.7 .114.1
R-Value by exudation 28 18 11
R-Value by exudation, corrected 28 18 11
Exudation pressure PSI 595 4261 256
Stability thickness FT 0.92 1.051 1.14
Expansion pressure thickness FT 1.00 0.55 0.10
DESIGN CALCULATION DATA SAMPLE INFORMATION
GeoSoils, Inc.
ç 5741 Palmer Way
@40 $i. Carlsbad, CA 92008
Telephone: (760) 438-3155
Fax: (760) 931-0915
'R -VALUE TEST RESULTS
Project: BROOKFIELD
Number 5949-E-SC
Date: Feb-il Figure: 1
TEST SPECIMEN A
Compactor air pressure PSI 350 300 240
Water added % 2.7 3.7 4.7
Moisture at compaction 12.0 13.0 14.0
Height of sample IN 2.43 2.43 2.49
Dry density PCF 122.3 119.6 116.0
R-Value by exudation 27 16 13
R-Value by exudation, corrected 25 15 13
Exudation pressure Psi 466 336 256
Stability thickness I FT 1 0.931 1.0131 1.11
Expansion pressure thickness I FT 1 0.331 0.201 0.07
DESIGN CALCULATION DATA
Traffic index, assumed 5.0
Gravel equivalent factor, assumed 1.25
Expansion, stability equilibrium 0
R-Value by expansion NA
R-Value by exudation 14
1 111-Value at equilibrium 14
Expansion, Stability Equilibrium
2.00
'1.50
m
(I)
>'
U) W1.00
0.50
0.00-V ' I I 1 I 1 1 I I I I
0.00 0.50 1.00 1.50 2.00
Cover Thickness by Expansion Pressure (ft)
SAMPLE INFORMATION
Sample Location: Cascade St 10+75
Sample Description: Yellow Brown Clayey Sand
Notes:
0% Retained on 3/4 inch sieve
In
GeoSoils, Inc.
(-'••c? 5741 Palmer Way
Carlsbad, CA 92008
"-• '-". Telephone: (760) 438-3155
Fax: (760) 931-0915
R - VALUE TEST RESULTS
Project: BROOKFIELD
Number: 5949-E-SC
Date: Mar-li Figure: 2
TEST SPECIMEN A B C D
Compactor air pressure PSI 350 290 230
Water added 3.2 3.7 4.2
Moisture at compaction % 12.0 12.5 13.0
Height of sample IN 2.44 2.52 2.59
Dry density PCF 121.8 117.2 114.1
R-Value by exudation 28 18 10
R-Value by exudation, corrected 26 18 10
Exudation pressure PSI 415 320 225
Stability thickness I FT 1 0.921 1.051 1.15
Expansion pressure thickness I FT 1 0.001 0.001 0.00
DESIGN CALCULATION DATA.
Traffic index, assumed 5.0
Gravel equivalent factor, assumed 1.25
Expansion, stability equilibrium 0
R.-Value by expansion NA
R-Value by exudation 17
R-Value at equilibrium 17
Expansion, Stability Equilibrium
2.00
1.50
U, (1)1.00
I II illII II I I I III
0.00 0.50 1.00 1.50 2.00
Cover Thickness by Expansion Pressure (ft)
SAMPLE INFORMATION
Sample Location: Northfork Av. 16+50
Sample Description: Yellow Brown Clayey Sand
Notes:
0% Retained on 3/4 inch sieve
Test Method: -- Cal-Trans Test 301
GeoSoils, Inc. R - VALUE TEST RESULTS
5741 Palmer Way Project: BROOKFIELD
Carlsbad, CA 92008
Telephone: (760) 438-3155 Number: 5949-E-SC
Fax: (760) 931-0915
Date: Mar-Il Figure: 3
APPENDIX
REFERENCES
California Department of Transportation, 2006, Caltrans, Standard specifications, May
printing.
Carlsbad, City of, 1993, Standards for design and construction of public works
improvements in the City of Carlsbad.
GeoSoils, Inc., 2010, Supplemental. pavement design report, Wind Trail Way
(Stations 1 6 to 1 8) ,Alander Court (Stations 1 2 to 1 9+21 and Cascade Street
(Stations 12 +25 to 15), Portion of Planning Area 16 of Robertson Ranch, Carlsbad,
San Diego County, California, W.O. 5949-E-SC, dated January 13.
2009, Pavement design report, Wind Trail Way (Stations 16 to 18 +76 ), Alander
Court (Stations 12+00 to 19+20 and Cascade Street (Stations 12 +25 to 15 +40 ), portion
of Planning Area 16 of Robertson Ranch, Carlsbad, San Diego County, California,
W.O. 5949-E-SC, dated December 2.
NEWCON90, 1991 Computer program for the determination of asphalt pavement sections,
dated April 30.
O'Day Consultants, 2006, Improvement plans for: Robertson Ranch East Village, City of
Carlsbad, Project no: C.T. 02-16, Drawing no. 433-6, dated December 29.
State of California, Department of Transportation, 2009, Guide for designing subgrade
enhancement geotextiles, dated April 28.
2008, Highway design manual of instructions, dated July 1.
GeoSoils, Inc.