HomeMy WebLinkAboutCT 01-04; CALAVERA HILLS VILLAGE U; PAVEMENT DESIGN REPORT; 2004-12-16c_ro.oL
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* - Geotechnical • Geologic• Environmental
5741 Palmer Way • Carlsbad California 92008. (760) 438-3155, • FAX (760) 931-0915
Revised December 16,
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Brookfield Homes
V. 12865 Pointe Del Mar, Suite 200
Del Mar, California 92014 -.. .
Attention Mr. John Moore
Subject Pavement Design Report, Calavera Hills Il, Village U, Carlsbad, San Diego
County, California
Dear Mr. Moore
In accordance with your request, GeoSoils, Inc. (GSI) has prepared design and
construction recommendations for asphalt concrete (AC) pavement at the subject site. The.
sèope of services provided in preparation of this report included representative sampling
of the street subgrade, R-value testing, and engineering analysis of pavement design
. . . .
PAVEMENT DESIGN
Pavement section design was performed in 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), determined from soils exposed at, or rear, final subgade elevations
within the subject areas R-value testing was performed in accordance with the latest
revisions to the Department of Transportation, State of California, Material & Research Test
Method No 301 Pavement design was aided with the computer software programs PAVE
and NEWCON90
ASPHALT CONCRETE PAVEMENT ....
Structural Section ..
R-values ranging from 16 to 23 were determined for subgrade soils 6nsite and used in
pavement design The recommended pavement sections are presented in the following
table
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AC AGGREGATE BASE
TRAFFIC SUBGRADE THICKNESS THICKNESS'2
TRAFFIC AREA INDEX R-VALUE (lnches)(1) (inches)
Peninsula Dr. (Sta.10to20 22 5.0 17 4.0 6.0
Peninsula Dr. (Sta. 20 to 5.0 29 4.0 5.0
26-)
Inlet Drive (All Stations) 5.0 16 4.0 6.0
FKarst Drive (All Stations) 5.0 16 4.0 6.0
City of Carlsbad minimum
Denotes Class 2 Aggregate Base ® >78, SE >25)
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 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. Positive site drainage shall be maintained at all times. Water shall not be allowed
to pond or seep into the ground. If planters or landscaping are adjacent to paved areas,
measures shall be taken to minimize the potential for water to enter the pavement section,
such as enclosing planters, sidewalks with thickened edges, etc. If the ADT (average daily
traffic) orADTT (average daily truck traffic) increases beyond that intended, as reflected by
the traffic index(s) used for design, increased maintenance and repair could be required
for the pavement section.
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 surlicial 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 approximately 6 inches, moisture conditioned as necessary, and
compacted to 95 percent of the maximum laboratory density, as determined by ASTM Test
Designation D-1557.
Brookfield Homes W.O. 4067-E-SC
Calavera Hills, Village U, Carlsbad Revised December 16, 2004
Fi1e:e:\wp9\4000\4067e.pdr Page 2 GeoSosis, Inc.
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 the
"Standard Specifications for Public Works Construction" (green book), 1997 edition, or
standard Caltrans Class 2 base rock (minimum R-value = 78).
Paving
Prime coat may be omitted if all of the following conditions are met:
The asphalt pavement layer is placed within two weeks of completion of base
and/or subbase course.
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 soil
engineer.
Drainage
Positive drainage shall be provided for 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. If planters or
landscaping are adjacent to paved areas, measures shall be taken to minimize the
potential for water to enter the pavement section, such as cut-off walls, etc.
Brookfield Homes W.O. 4067-E-SC
Calavera Hills, Village U, Carlsbad Revised December 16, 2004
Fi1e:e:\wp9\4000\4067e.pdr Page 3
GeoSoils, Inc.
David W. Sb
Civil Engineer, HUE 47857
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,
either express or implied, is given. 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 work performed when GSI is not requested to be onsite, to evaluate if our
recommendations have been properly implemented. Use of thi.s 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. Thus, this report brings to completion our scope of
services for this portion of the project. -
The opportunity to be of service is greatly appreciated. If you have any questions, please
do not hesitate to call our office.
Respectfully
G.
GeoSo
No. 193
ilsjnc.
/ I Exp.O(17,j
Robert G. Crisman .
Engineering Geolog
RGC/JPF/DWS/jh
Attachments: Figures 1 through 3 - R-value Test Results
Appendix - References
Distribution: (3) Addressee
(1) Jobsite Trailer, Attention: Mr. Adam Vandervort
Brookfield Homes W.O. 4067-E-SC
Calavera Hills, Village U, Carlsbad Revised December 16, 2004
Fi1e:e:\wp9\4000\4067e.pdr Page 4
GeoSoils, Inc.
it
APPENDIX S
REFERENCES
American Public Works Association, 2000, "Greenbook" standard specification for public
works construction.
California Department of Transportation, 1995, Caltrans, standard specifications, July
printing.
Carlsbad, City of, 1993, Standards for design and construction of public works
improvements in the City of Carlsbad.
S
S
NEWCON90, 1991 Computer program for the determination of asphalt pavement sections,
version: April 30. 5
PAVE, Computer program for the determination of asphalt concrete pavement sections.
State of California, Department of Transportation, 1987, Highway design manual of
instructions, fourth edition. S S
GeoSoils, Inc.