HomeMy WebLinkAboutCT 14-09; UPTOWN BRESSI RANCH; RESPONSE TO CITY OF CARSLBAD PLANCHECK COMMENTS; 2018-03-02) .....,,,
GEOCON ■ MATERIALS.
INCORPORATED
GEOTECHNICAL ■ ENVIRONMENTAL
Project No. 02108-32-02
March 2, 2018 RECEIVED
MARO 6 2018
Shea Homes
9990 Mesa Rim Road LAND DEVELOPMENT
ENGINl=ERING San Diego, California 92121
Attention: Mr. Greg Ponce
Subject: RESPONSE TO CITY OF CARLSBAD PLAN CHECK COMMENTS
BRESSI RANCH
LOTS 1 THROUGH 4
FINAL MAP 14-09
GR 2018-0004
CARLSBAD, CALIFORNIA
References: 1. Update Report and Change of Geotechnical Engineer of Record, Bressi Ranch,
Lots 29 Through 32, Carlsbad, California, prepared by Geocon Incorporated, dated
April 24, 2017.
2. Precise Grading Plans For: Uptown Bressi, Lot 1, Carlsbad, California, Sheets 1
through 30, prepared by Rick Engineering, undated.
Dear Mr. Ponce:
This letter has been prepared to address City of Carlsbad plan check comments received from Rick
Engineering on February 27, 2018, for the subject project. The comments were written informally on
the cover page of the referenced report. Each item is listed below with the response immediately
following.
Item 1.
Response:
Item 2.
Response:
Item 3.
Response:
Reference GR 2018-004.
We have referenced this number above.
Clarify the referenced report applies to Lot I.
The referenced report utilized the lot numbering provided prior to the current site
development. For the current overall residential and commercial development, lot
line adjustments and lot re-numbering was required. Therefore, previous lot
numbers 29 through 32 of CT No. 14-09 are now Lots 1 through 4 of FM 14-09.
Lot 1 includes the entire residential subdivision and Lots 2 through 4 represent the
commercial subdivision.
The Consultant should provide preliminary asphalt concrete pavement design
recommendations.
Limited testing has been performed to date, which has resulted in R-Values ranging
from 4 to 20. The preliminary pavement recommendations presented herein are
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6960 Flanders Drive ■ San Diego, California 92121-2974 ■ Telephone 858.558.6900 ■ Fax 858.558.6159
based on an R-Value of 10. Final pavement sections should be calculated once
subgrade elevations have been attained and R-Value testing on actual subgrade
samples is performed. Asphalt concrete pavement thicknesses were calculated using
procedures outlined in the California Highway Design Manual (Caltrans).
Summarized on Table 1 are recommended pavement sections for various roadway
classifications and traffic indices. It is our opinion that traffic indices of 4.5 and 5.0
are appropriate for parking stalls and parking lot drive aisles, respectively. In
addition, it is our opinion that fire access roadways may utilize the local street
criteria presented below.
TABLE 1
PRELIMINARY ASPHALT CONCRETE PAVEMENT SECTIONS
Street Class Traffic Index Asphalt Concrete Class 2 Aggregate
(inches) Base (inches)
Cul-de-Sac 4.5 4 5
Local Street 5.0 4 7
Collector Street 6.0 4 11
Prior to placing base materials, the subgrade soil should be scarified, moisture
conditioned as necessary, and recompacted to a dry density of at least 95 percent of
the laboratory maximum dry density near to slightly above optimum moisture
content as determined by ASTM D 1557. The depth of compaction should be at least
12 inches. Similarly, the base materials should be compacted to a dry density of at
least 95 percent of the laboratory maximum dry density near to slightly above
optimum moisture content. Asphalt concrete should be compacted to a density of at
least 95 percent of the laboratory Hveem density in accordance with ASTM D 2726.
The opportunity to be of service is greatly appreciated. If you have any questions regarding this letter,
or if we may be of further service, please contact the undersigned at your convenience.
Very truly yours,
GEOCON INCORPORATED
-~-~) /Er--.
Trevor E. Myers
RCE63773 ,
TEM:DBE:dmc
(e-mail)
(e-mail)
Addressee
Rick Engineering
Attention: Mr. Raun Connely
Project No. G2108-32-02 -2 -March 2, 2018