HomeMy WebLinkAboutCT 02-16; ROBERTSON RANCH EAST VILLAGE; PAVEMENT DESIGN REPORT; 2007-09-18Geotechñical • Coastal 'Geologic' Environmental
5741 Palmer Way Carlsbad California 92010 (760) 43.8-3155 FAX (760) 931.-0918.
September 18, 2007 ;•
V.0. 5354-E-SC
McMillin Communities
2750 Womble Road
San Diego, California 92106
Attention Mr Don Mitchell
Subject: Pavement Design Report, Improvement (Widening) of College Boulevard
(Stations 103 to 118~i), and Cannon Road (Stations 127 to 159),
City of Carlsbad, San Diego County California
Dear Mr Mitchell
In accordance with your request, GeoSoils, Inc: (GSl), has prepared this revised
preliminary design and construction recommendations for asphalt concrete (AC) pavement.
at the subject site. 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'
structural pavement section for a given area, and preparation of this report
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 table); determined from
soils exposed at, or near, final subgrade 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
4
ASPHALT CONCRETE PAVEMENT
Structural Section
-
.11-values .ran'ging' from 5 to 68 were determined for sJbgrade soils onsite and used in
pavement design The recommended pavement sections are presented in the following
table
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t .• • •- • •• -- •• - - • . . -. • '- •
F) 'TRAFFIC S (IBGRADE THICKNESS THICKNESS
TRAFFIC AREA JNDEX R-VALUE (Inches)13 / (inches)"
Cannon Road (so. side) . 8.5 12 5.0 17.0
Stations 127+L0 to 130+00
Cannon Road (so. side) 8.5 25 5.0 13.0
Stations 130 to 135+
Cannon Road (so. side) . 8.5 5 6.0* 20.0*
Stations 135+22 to 140 +20
Cannon Road (so. side) 8.5 11 6.0* 20.0*
Stations 140+22 to 145+
Cannon Road (so. side) 8.5 5 6.0* 20.0*
Stations 145+22 to 150+22
Cannon Road (so. 'side) 8.5 5 6.0* 20.0*.
Stations 150+00 to 155
Cannon Road (so. side) 8.5 8 6.0* 20.0*
Stations 155 to 159
Cannon Road (no. side) 8.5 68 5.0 6.0
Stations 128 to 131
Cannon Road (no. side) 8.5 5 6.0*. 20.0*
Stations 131to 136+22
Cannon Road (no. side) 8.5 25 5.0 13.0
Stations 136 to 137
Cannon Road (no. side) 8.5 6 6.0* . 20.0*
Stations 137+L0 to 142+22
Cannon Road (no. side) 8.5 7 , 6.0* , 20.0*
Stations 142 to 148
Cannon Road (no. side) 8.5 8 ' 6.0* 20.0*
Stations 148 to 153+22
College Blvd. (So. side)' 8.5 23 , 5.0 . 14.0
Stations 103+2§ to 108+22 '
College Blvd. (so. 'side) 8.5 . 22 5.0 14.0
Stations 108 to 112
College Blvd. (so. side) 8.5 22 5.0 14.0
Stations 112to 115'
College Blvd. (no. side) 8.5 14 , 5.0 17.0
Stations 06+22 111
College Blvd. (no. side) 8.5 5 6.0* 20.0*
Stations 111to116
1
(1) City minimum. ,
Denotes Class 2 Aggregate Base R >78, SE >25).
(3) New pavement shall match existing where existing pavement exceeds table values.
* Exceeds Caltrans requirements.
Calavera Hills II, LLC W.O. 5354-E-SC
Improvements for College/Cannon September 18, 2007
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GeoSoils, Inc.
All pavement installation, including preparation and compaction of subgrade, compactibr1
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. New pavement shall match existing where existing
,
pavement exceeds table values presented herein It should be noted that subgrade lime
'treatment was previously waived by ,the City for the construction of the existing pavement
sections (GSl, 2004a, 2004b, and 2004c). It is therefore anticipated that lime stabilization
will not be performed for the current, road widening. '' ' ,' ' • ' '
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,
increasedmaintenance 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 the increased potential for distress from overuse
of paved street areas by hOavy' 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 subgradé, base ,
rock, and as 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
Calavera Hills Ii, LLC '" '. ' ; ' ' ' •,' ' ' • , W.0 5354-F-SC' '
College/Cannon Widening, Carlsbad September 18 2007
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GéoSoils, Inc.
OTHER DESIGN PROFESSIONALS/CONSULTANTS
The design civil engineer shall review the recommendations provided lërein, incorporate
those recommendations into their plans, and by.éxplicit reference, make this report part
APPENDIX
REFERENCES
California Department of Transportation, 2006, Caltrans, Standard specifications, May