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January 21, 2019
SLO8639-12
Client:
MI Entitlement IV,
LLC
C/o Coastal
Community Builders
Mr. Dave Daniels
Post Office Box 13
Pismo Beach
California 93449
Project name:
Tract 3096
San Luis Ranch
San Luis Obispo
California
220 High Street
San Luis Obispo CA 93401
805.543.8539
1021 Tama Lane, Suite 105
Santa Maria, CA 93455
805.614.6333
201 S. Milpas Street, Suite 103
Santa Barbara, CA 93103
805.966.2200
info@geosolutions.net
Pavement Structural Section Design with Geotextile Reinforcing Grid
Dear Mr. Daniels:
As requested, GeoSolutions, Inc. has prepared pavement structural section designs for
the proposed San Luis Ranch Development, Tract 3096, located east of Madonna Road,
west of the 101 Freeway, and south of Dalidio Drive in San Luis Obispo, California. The
pavement structural sections presented below include information for unphased
pavement section construction with Type 2 biaxial geogrid and without geogrid
reinforcement. The un-reinforced pavement structural sections were determined based
on an R-Value test result of less than 5.0 and Specification 7110-Flexible Pavement
Elements (City of San Luis Obispo, 2014).
The structural sections with Type 2 biaxial geogrid were determined in accordance with
the referenced design guide prepared by the California Department of Transportation,
which allows for sub -grade improvement with geogrid when the sub -grade R-Value is
below a value of 25. When geogrid that conforms to the minimum property requirements
of sub -grade enhancement per the referenced guide is utilized, a design R-value of 25
may be utilized for design of the structural section. This results in a decrease in thickness
of the required aggregate base material see Table 1 below.
Table 1: Pavement Structural Sections — Unphased Construction
Traffic
Geogrid Reinforced
Un-Reinforced
Street Description
Index
Section
Section
HMA
AB
HMA
AB
(T.I.)
Interior Streets
6.5
4.0
9.0
4.0
14.0
Reconstructed Arterials
8.5
5.5
13.0
5.5
19.0
(Madonna/Dalidio)
New Arterial/Collector
9.5
6.5
14.0
6.5
21.5
(Froom)
HMA = Hot Mix Asphalt meeting Caltrans Specifications
AB = Aggregate Base meeting Caltrans Specification for Class 2 Aggregate Base
(R-Value = 78 Min)
Thank you for the opportunity to have been of service in preparing this report. If you have
any questions or require additional assistance, please feel free to contact the
undersigned at (805) 543-8539.
Sincerely
GeoSoIV
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Ranch Open Consult\Construdion\SLO8639-12 San Luis Ranch Pavement Sections.doc
sbinfo@geosolutions.net
Tract 3096, San Luis Ranch
January 21, 2019 Project SL08639-12
REFERENCES
Subgrade Enhancement Geosynthetic Design and Construction Guide, California Department of
Transportation, Pavement Program, Office of Concrete Pavements and Pavement Foundations,
dated September 21, 2013.
Soils Engineering Report, San Luis Ranch - Dalidio, Madonna Road, San Luis Obispo, California, by
GeoSolutions, Inc., Project SL08639-6, dated May 29, 2015.
Soils Engineering Report Addendum #1, Temporary Access Road and Stockpile Area, San Luis Ranch —
Dalidio, Madonna Road, San Luis Obispo, California, by GeoSolutions, Inc., Project SL08639-12,
dated January 13, 2017.
Geotechnical Plan Review #1 - Temporary Stockpile Area, Tract 3096, San Luis Ranch, San Luis Obispo,
California, by GeoSolutions, Inc., Project SL08639-12, dated August 31, 2017.
Soils Engineering Report Update Letter, Tract 3096, San Luis Ranch, San Luis Obispo, California, by
GeoSolutions, Inc., Project SL08639-12, dated June 12, 2018.
Geotechnical Plan Review #2 — Early Grading Plans, Tract 3096, San Luis Ranch, San Luis Obispo,
California, by GeoSolutions, Inc., Project SL08639-12, dated June 13, 2018.
2 GEa.1,