HomeMy WebLinkAboutCT 13-05; STATE STREET TOWNHOMES; PAVER DESIGN RECOMMENDATIONS; DWG 484-2, DWG 484-2A; 2014-07-14Pi.A.i+J i{
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July 14, 2014
Ms. April Tornillo
Taylor Morrison
8105 Irvine Center Drive, Suite 1450
Irvine, CA 92618
Project No. 13200-01
Subject: Pavers Design Recommendations for the Proposed State Street Townhomes, 2531 through
2589 State Street, City of Carlsbad, California
References: Brick Industry Association, 2003, Flexible Vehicular Brick Paving, A Heavy Duty
Applications Guide, published January 2003.
Introduction
LGC Geotechnical, Inc., 2014, Preliminary Geotechnical Evaluation for the Proposed State
Street Townhomes, 253 l through 2589 State Street, City of Carlsbad, California, Project No.
13200-0 I, dated July 3, 2014.
In accordance with your request, LGC Geotechnical, Inc. has prepared this report presenting the
recommended pavers design sections for the proposed State Street Townhomes between 2531 and 2589 State
Street, City of Carlsbad, California.
Pavers Design
A design Traffic Index (TI) determined by the project Civil Engineer of 5.0 has been used for the proposed
paver areas. R-Value testing will be performed on finished grade soils at the completion of grading, however,
for these preliminary geotechnical recommendations an R-Value of 15 has been assumed.
Concrete pavers should be a minimum of 3 and 1/8 inches (80 mm) thick, rated for vehicular traffic.
Manufacturer's specific recommendations regarding the pavers (required bedding and jointing sand, etc.)
should be implemented during construction. It should be noted that pavers are typically underlain by a thin
layer of bedding sand followed by compacted aggregate base and if necessary, a layer of geogrid
reinforcement.
Calculations for the design sections resulted in pavers sections that are suitable from a geotechnical
standpoint (Table 1). Concrete pavers may be underlain with a I to 2 inch layer of bedding sand followed b
minimum of IO inches of compacted aggregate base over compacted subgrade soils.
131 Calle Iglesia, Suite 200, San Clemente, CA 92672 , ,~, (949) 369-6141 ,t', www.lgcgeotechnical.com
Aggregate base must be compacted in thin lifts to a minimum of 95 percent relative compaction of its
maximum density per ASTM D1557. Subgrade soils must be compacted a minimum of 90 percent relative
compaction (ASTM D1557).
TABLE 1
Calculated Pavers Section for Proposed State Street Townhomes
Design Vehicular Pavers
Traffic Crushed Aggregate Base
Indices Sand Thickness* (in) (CAB) Thickness** (in)
5.0 l to 2 10.0
* It should be noted that bedding sand layer thickness should be obtained from the Flexible Vehicular Brick
Paving: A Heavy Duty Applications Guide (Brick Industry Association. 2003).
**Crushed Aggregate Base material shall meet minimum specification of crushed aggregate base (CAB)
per Section 200-2 Untreated Base Materials per latest edition ofGreenbook.
Concrete bands around the perimeter of the pavers are recommended. The concrete bands should be at least 6
inches thick, with two No. 4 rebar placed longitudinally at approximately mid-height. The concrete should be
underlain by a minimum of 4 inches of crushed base material.
The thicknesses above are minimum thicknesses. Increasing the thickness of any or all of the above layers
will reduce the likelihood of the pavement experiencing distress during its service life. The above
recommendations are based on the assumption that proper maintenance and irrigation of the areas adjacent to
the roadway will occur through the design life of the pavement. Failure to maintain a proper maintenance
and/or irrigation program may jeopardize the integrity of the pavement and pavers.
Limitations
Our services were performed using the degree of care and skill ordinarily exercised, under similar
circumstances, by reputable soils 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.
It should be understood that LGC Geotechnical, Inc. has relied on the accuracy of documents, verbal
information, and other material and information provided by you and other associated parties in preparation
of this report. LGC Geotechnical, Inc. makes no warranties or guarantees as to the accuracy or completeness
of information obtained from or compiled by others.
Project No. 13200-01 Page2 July 14, 2014
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We appreciate this opportunity to be of service. Should you have any questions or concerns regarding this
letter, please do not hesitate to contact our office.
Sincerely,
LGC Geotechnical, Inc.
Tim Lawson, CEG 1821, GE 2626
Geotechnical Engineer/Geologist
TJL/JTC/kmb
Distribution: (3) Addressee (includes 2 wet-signed copies)
(1) Adams Streeter Civil Engineers, Inc. (via email)
Attention: Mr. Mohammad Abadi
Project No. 13200-01 Page3 July 14, 2014