HomeMy WebLinkAboutCT 14-09; UPTOWN BRESSI RANCH; FLEXIBLE PAVEMENT RECOMMENDATIONS; 2018-04-12('
GEOCON AL ■ ENVIRONMENTAL ■ MATERIAL<.
INCORPORATED
GEOTECHNIC
Project No. 02108-32-02
April 12, 2018
Shea Homes
9990 Mesa Rim Road
San Diego, California 92121
Attention:
Subject:
Mr. Greg Ponce
FLEXIBLE PAVEMENT RECOMMENDATIONS
UPTOWN BRESSI RANCH
PRIVATE DRIVE A (14+30 TO 18+00)
PRIVATE DRIVE I (10+00 TO 12+00)
PRIVATE DRIVE J (10+00 TO 12+00)
PRIVATE DRIVE K ( 10+00 TO 12+00)
PRIVATE DRIVEN (10+00 TO 16+00)
PRIVATE DRIVE O (10+00 TO 12+75)
CARLSBAD, CALIFORNIA
Dear Mr. Ponce:
In accordance with the request of Mr. Kevin Bunn, we have obtained representative subgrade soil
samples throughout the commercial portion of subject site to provide pavement design
recommendations for the private interior streets. After collection, the samples were returned to our
laboratory and subjected to Resistance Value (R-Value) testing. We utilized the City of Carlsbad
Engineering Standards, Standard Drawing GS-17, to estimate the Traffic Indices (Tl) for use in
calculating the pavement sections.
Based on laboratory testing and observations during grading operations, the subgrade soils
predominately consist of silty/clayey sands and sandy/silty clays and typically exhibit relatively low to
moderate R-Value characteristics. We performed laboratory R-Value tests in accordance with ASTM
D 2844 (California Test Method No. 301). A summary of the laboratory R-Value test results is
presented on Table I.
Based on the information above and laboratory testing, we recommend the pavement sections
presented on Table II. We performed pavement section calculations in accordance with California
Department of Transportation Highway Design Manual; Section 608.4. Pavement section calculations
are presented on Figure 1. The pavement design sections presented herein should be submitted to the
City of Carlsbad for final approval.
Prior to placing base materials, the upper 12 inches of subgrade soil should be scarified, moisture
conditioned as necessary, and compacted to a dry density of at least 95 percent of the laboratory
maximum dry density at to slightly above optimum moisture content in accordance with ASTM
D 1557. For concrete sidewalks supporting pedestrian traffic only, the upper 12 inches of subgrade
6960 Flanders Drive ■ Son Diego, Colifornio 92121-2974 ■ Telephone 858.558.6900 ■ Fox 858.558.6159
..
should be compacted to a dry density of at least 90 percent of the laboratory maximum dry density at
to slightly above optimum moisture content.
The base materials should be compacted to a dry density of at least 95 percent of the laboratory
maximum dry density at to slightly above optimum moisture content. The asphalt concrete should be
compacted to a density of at least 95 percent of the laboratory Hveem density in accordance with
ASTMD2726.
The performance of asphalt concrete pavement is highly dependent on providing positive surface
drainage away from the edge of the pavement. Ponding of water on or adjacent to the pavement will
likely result in saturation of the subgrade materials and subsequent pavement distress. To reduce the
occurrence for such situations, a minimum drainage gradient of 1 percent should be maintained for
pavement surfaces. Drainage from landscaped areas should be directed to controlled drainage
structures.
Should you have any questions regarding this correspondence, or if we may be of further service,
please contact the undersigned at your convenience.
Very truly yours,
GEOCONINCORPORATED
~~:.:1)~
RCE63773 /
TEM:ejc
( e-mail) Addressee
Project No. G2108-32-02 -2 -April 12, 2018
C
TABLE!
SUMMARY OF LABORATORY RESISTANCE VALUE (R-VALUE) TEST RESULTS
ASTM D 2844 (CALIFORNIA TEST METHOD 301)
Sample No. Location R-Value
R-1 Private Drive D (10+00 to 12+75) 12
R-2 Private Drive A (14+30 to 18+00) II
R-3 Private Drive N (13+00 to 16+00) 4
R-4 Private Drive N (I 0+00 to 13+00) 20
R-5 Private Drive I (10+00 to 12+00) 6
R-6 Private Drive K (10+00 to 13+50) 5
R-7 Private Drive J (10+00 to 12+10) 5
TABLE II
PAVEMENT SECTION RECOMMENDATIONS
Estimated Asphalt Class 2
Location Classification Traffic Index Concrete Aggregate Base
(TI) (inches) (inches)
Private Drive A (14+30 to 18+00) Local Street 5.0 4 7
Private Drive D (10+00 to 12+75) Local Street 5.0 4 7
Private Drive I (10+00 to 12+00) Local Street 5.0 4 8
Private Drive J (10+00 to 12+00) Local Street 5.0 4 8
Private Drive K (10+00 to 13+50) Local Street 5.0 4 8
Private Drive N (10+00 to 13+00) Local Street 5.0 4 6
Private Drive N (13+00 to 16+00) Local Street 5.0 4 8
Project No. G2 l 08-32-02 -3 of 4 -April 12, 2018
FIGURE 1
UPTOWN BRESSI RANCH
PAVEMENT CALCULATIONS
PRELIMINARY PAVEMENT DESIGN
Project Name:
Project Number:
Date:
Sample Number:
Subgrade R-Value:
Minimum Asphalt thickness (in.}:
Minimum Base Thickness, Is (in.}:
Gravel Equiv.,(G,} for Base:
Base Material R-Value:
T raffle Index, Tl
Gravel Equivalent GE (fl}= O.OO32(Tl}(1OO-R}
FULL ASPHALT SECTION
Asphalt Thickness if< 0.5 fl (fl}
Check if Asphalt Thickness if> 0.5 fl (fl}
I Asphalt Design Thickness, t.c (in.}
ASPHALT AND BASE SECTION
GEA= TG, = O.OO32(Tl}(1OO-78}-+-0.2, (fl}
Uptown Bressi
Ranch
G2108-32-O2
4/9/2018
R-1
12
4.0
4.0
1.1
78
Asphalt Thickness, T if< 0.5 ft (II} = GEAIG, = GEA "Tl0 5/5.67
Asphalt Thickness, T if> 0.5 ft (fl}= (GEA "fl05f7)075
Design Asphalt Thickness (fl}
GE of Design Asphalt Thickness
Required GE for Base Section
Thickness of Aggregate Base, IAs (ft}
Design Aggregate Base Thickness, IAs (ft}
Minimum Asphalt Design Thickness, tAc (in.)
Minimum Aggregate Base Design Thickness, t.a (in.)
5.0
1.41
0.59
0.58
6.94
0.55
0.22
0.22
0.33
0.85
0.56
0.51
0.51
4.00
6.14
PRELIMINARY PAVEMENT DESIGN
Project Name:
Project Number:
Date:
Sample Number:
Subgrade R-Value:
Minimum Asphalt thickness (in.}:
Minimum Base Thickness, Is (in.}:
Gravel Equiv.,(G,} for Base:
Base Material R-Value:
Traffic Index, Tl
Gravel Equivalent, GE (fl}= 0.0032(11)(100-R)
FULL ASPHALT SECTION
Asphalt Thickness if< 0.5 fl (fl}
Check if Asphalt Thickness if> 0.5 fl (fl}
I Asphalt Design Thickness, t.c (in.)
ASPHALT AND BASE SECTION
GEA = TG, = O.OO32(Tl}(1OO-78}-+-0.2, (fl}
Uptown Bressi
Ranch
G21O8-32-O2
4/9/2018
R-2
11
4.0
4.0
1.1
78
Asphalt Thickness, T if< 0.5 ft (ft}= GEA/G, = GEA "Tl0 5/5.67
Asphalt Thickness, T if> 0.5 ft (fl}= (GEA "fl05f7)075
Design Asphalt Thickness (II}
GE of Design Asphalt Thickness
Required GE for Base Section
Thickness of Aggregate Base, IAs (ft}
Design Aggregate Base Thickness, IAs (ft}
Minimum Asphalt Design Thickness, tAc (in.}
Minimum Aggregate Base Design Thickness, tAe (in.)
5.0
1.41
0.60
0.58
6.99
0.55
0.22
0.22
0.33
0.85
0.58
0.53
0.53
4.00
6.31
Project No. G2108-32-02 -I of 4 -April 12, 2018
FIGURE 1
UPTOWN BRESSI RANCH
PAVEMENT CALCULATIONS (Continued)
PRELIMINARY PAVEMENT DESIGN
Project Name:
Project Number:
Date:
Sample Number:
Subgrade R-Value:
Minimum Asphalt thickness (in.}:
Minimum Base Thickness, lB (in.}:
Gravel Equiv.,(Gr} for Base:
Base Material R-Value:
T raffle Index, Tl
Gravel Equivalent, GE (fl}= 0.0032(11)(100-R}
FULL ASPHALT SECTION
Asphalt Thickness if< 0.5 ft (ft)
Check if Asphalt Thickness if> 0.5 ft (ft)
I Asphalt Design Thickness, tAe (in.)
ASPHALT AND BASE SECTION
GEA = TGr = 0.0032(TI}(100-78)-+-0.2, (fl}
Uptown Bressi
Ranch
G2108-32-02
4/9/2018
R-3
4
4.0
4.0
1.1
78
Asphalt Thickness, T if< 0.5 ft (ft}= GEA/Gr= GEA '11°5/5.67
Asphalt Thickness, T if> 0.5 ft (ft}= (GEA 'Tl05f7)075
Design Asphalt Thickness (fl}
GE of Design Asphalt Thickness
Required GE for Base Section
Thickness of Aggregate Base, tAs (ft}
Design Aggregate Base Thickness, tAs (ft}
Minimum Asphalt Design Thickness, be (in.)
Minimum Aggregate Base Design Thickness, t.e (in.)
5.0
1.54
0.65
0.61
7.38
0.55
0.22
0.22
0.33
0.85
0.69
0.63
0.63
4.00
7.54
PRELIMINARY PAVEMENT DESIGN
Project Name:
Project Number:
Date:
Sample Number:
Subgrade R-Value:
Minimum Asphalt thickness (in.):
Minimum Base Thickness, ts (in.}:
Gravel Equiv.,(Gr} for Base:
Base Material R-Value:
T raffle Index, Tl
Gravel Equivalent, GE (ft}= 0.0032(TI}(100-R}
FULL ASPHALT SECTION
Asphalt Thickness if< 0.5 ft (fl}
Check if Asphalt Thickness if> 0.5 ft (fl}
Asphalt Design Thickness, be (in.}
ASPHALT AND BASE SECTION
GEA = TG1 = 0.0032(TI)(100-78}-+-0.2, (ft)
Uptown Bressi
Ranch
82108-32-02
4/9/2018
R-4
20
4.0
4.0
1.1
78
Asphalt Thickness, T if< 0.5 ft (fl}= GEA/Gr= GEA '11°5/5.67
Asphalt Thickness, T if> 0.5 ft (fl}= (GEA 'TIOSf7}01s
Design Asphalt Thickness (fl}
GE of Design Asphalt Thickness
Required GE for Base Section
Thickness of Aggregate Base, tAs (ft}
Design Aggregate Base Thickness, tAs (fl}
Minimum Asphalt Design Thickness, be (in.)
Minimum Aggregate Base Design Thickness, be (in.)
5.0
1.28
0.54
0.54
6.49
0.55
0.22
0.22
0.33
0.85
0.43
0.40
0.40
4.00
4.74
Project No. G2108-32-02 -2 of 4 -April 12, 2018
r-........,
FIGURE 1
UPTOWN BRESSI RANCH
PAVEMENT CALCULATIONS (Continued)
PRELIMINARY PAVEMENT DESIGN
Project Name:
Project Number:
Date:
Sample Number:
Subgrade R-Value:
Minimum Asphalt thickness (in.):
Minimum Base Thickness, Is (in.):
Gravel Equiv.,(Gr) for Base:
Base Material R-Value:
Traffic Index, Tl
Gravel Equivalent, GE (fl) = O.OO32(11)(10O-R)
• FULL ASPHALT SECTION
Asphalt Thickness if< 0.5 ft (ft)
Check if Asphalt Thickness if> 0.5 ft (ft)
I Asphalt Design Thickness, tAc (in.)
ASPHALT AND BASE SECTION
GEA = TGr = O.OO32(Tl)(1OO-78)-t-0.2, (ft)
Uptown Bressi
Ranch
82108-32-02
4/9/2018
R-5
6
4.0
4.0
1.1
78
Asphalt Thickness, T if< 0.5 ft (fl)= GEA/Gr= GEA "'fl05/5.67
Asphalt Thickness, T if> 0.5 ft (fl) = (GEA "TIO 5/7)075
Design Asphalt Thickness (ft)
GE of Design Asphalt Thickness
Required GE for Base Section
Thickness of Aggregate Base, IAs (ft)
Design Aggregate Base Thickness, IAs (fl)
Minimum Asphalt Design Thickness, t.c (in.)
Minimum Aggregate Base Design Thickness, t,e (in.)
5.0
1.50
0.63
0.61
7.27
0.55
0.22
0.22
0.33
0.85
0.66
0.60
0.60
4.00
7.19
PRELIMINARY PAVEMENT DESIGN
Project Name:
Project Number:
Date:
Sample Number:
Subgrade R-Value:
Minimum Asphalt thickness (in.):
Minimum Base Thickness, Is (in.):
Gravel Equiv.,(Gr) for Base:
Base Material R-Value:
Traffic Index, Tl
Gravel Equivalent, GE (fl) = 0.0032(11)( 100-R)
FULL ASPHALT SECTION
Asphalt Thickness if< 0.5 ft (ft)
Check if Asphalt Thickness if> 0.5 ft (ft)
I Asphalt Design Thickness, be (in.)
ASPHALT AND BASE SECTION
GEA = TGr = O.OO32(Tl)(1OO-78)-t-0.2, (fl)
Uptown Bressi
Ranch
82108-32-02
4/9/2018
R-6
5
4.0
4.0
1.1
78
Asphalt Thickness, T if< 0.5 ft (ft)= GEA/Gr= GEA "11°5/5.67
Asphalt Thickness, T if> 0.5 ft (fl)= (GE, "TI05f7)015
Design Asphalt Thickness (ft)
GE of Design Asphalt Thickness
Required GE for Base Section
Thickness of Aggregate Base, IAs (fl)
Design Aggregate Base Thickness, IAs (fl)
Minimum Asphalt Design Thickness, t.c (in.)
Minimum Aggregate Base Design Thickness, tAs (in.)
5.0
1.52
0.64
0.61
7.32
0.55
0.22
0.22
0.33
0.85
0.67
0.61
0.61
4.00
7.36
Project No. G2 l 08-32-02 -3 of 4 -April 12, 2018
,--
FIGURE 1
UPTOWN BRESSI RANCH
PAVEMENT CALCULATIONS (Concluded)
PRELIMINARY PAVEMENT DESIGN
Project Name:
Project Number:
Date:
Sample Number:
Subgrade R-Value:
Minimum Asphalt thickness (in.):
Minimum Base Thickness, ts (in.):
Gravel Equiv.,(G,) for Base:
Base Material R-Value:
Traffic Index, Tl
Gravel Equivalent, GE (11) = 0.0032(Tl}(100-R)
FULL ASPHALT SECTION
Asphalt Thickness if< 0.5 fl (fl)
Check if Asphalt Thickness if> 0.5 fl (fl)
I Asphalt Design Thickness, tAc (in.)
ASPHALT AND BASE SECTION
GEA= TG1 = 0.0032(TI}(100-78)-+-0.2, (fl)
Uptown Bressi
Ranch
G2108-32-02
4/9/2018
R-7
5
4.0
4.0
1.1
78
Asphalt Thickness, T if< 0.5 fl (fl)= GEA/G1 = GEA "TID 5/5.67
Asphalt Thickness, T if> 0.5 II (fl) = (GEA "Tio 5J7)015
Design Asphalt Thickness (II)
GE of Design Asphalt Thickness
Required GE for Base Section
Thickness of Aggregate Base, tAs (fl)
Design Aggregate Base Thickness, tAs (fl)
Minimum Asphalt Design Thickness, he (in.)
Minimum Aggregate Base Design Thickness, he (in.)
Project No. G2108-32-02
5.0
1.52
0.64
0.61
7.32
0.55
0.22
0.22
0.33
0.85
0.67
0.61
0.61
4.00
7.36
-4 of 4 -April 12, 2018