HomeMy WebLinkAboutCT 00-06; BRESSI RANCH; CONFIRMATION OF PREVIOUSLY PERFORMED R-VALUE TEST RESULT; 2005-04-14V
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Leighton and Associates, Inc.
A LEIGHTON GROUP COMPANY
April 14, 2005
Project No. 971009-017
To: Lennar Communities
1525 Faraday Avenue, Suite 300
Carlsbad, California 92008
Attention: Mr. Sean Scholey
Subject: Confirmation of Previously Performed R-Value Test Result and Pavement Section
Design Recommendation, RV Parking Facility, Planning Area PA- 13, Bressi Ranch,
Carlsbad, California
Reference: Pavement Section Design Recommendations for the RV Parking Facility, Planning
Area PA-13, Bressi Ranch, Carlsbad, California, Project No. 971009-017, dated
January 6, 2005
In accordance with the request of the City of Carlsbad, this letter presents our supplemental R-
Value testing that indicates the previously recommended pavement section for the RV parking
facility (Leighton, 2005) is still applicable and additional recommendations are not warranted. R-
value testing for the parking facility and entry road was previously performed at approximate
Station No. 2+15 of the entry road. The results of the R-value testing and pavement section design
recommendations were provided in our letter dated January 6, 2005 (Leighton, 2005). The
recommended pavement section presented in the letter was 4 inches of asphalt concrete over 13
inches of aggregate base material
Due to the storm drain trench excavation and backfill that was performed at approximate Station
1+25 of the entry road (subsequent to our pavement section letter), an additional R-Value was
performed of the trench backfill soils at finish grade of the roadway. The test result indicates the
subgrade soils have an R-value of 16 (as indicated in Appendix A). Since the previously
recommended pavement section for the RV parking facility and entry road assumed an R-Value of
9 and the supplemental R-Value was determined to be a 16, it is our professional opinion that the
recommended pavement section is still applicable and should be followed.
3934 Murphy Canyon Road, Suite B205 • San Diego, CA 92123-4425
858.292.8030 • Fax 858.292.0771 • www.leightongeo.com
971009-017
If you have any questions regarding our letter, please contact this office. We appreciate this
opportunity to be of service.
Respectfully submitted,
LEIGHTON AND ASSOCIATES, INC.
4U ~~ vj"y-----
Randall K. Wagner, ftG 1612
Senior Associate
. No. 1612
* CERTIFIED *
Attachments: Appendix A - Laboratory Testing Procedures and Test Results NGlNEERING
p GEOLOGIST
OF CA 0
Distribution: (2) Addressee El 3 .-' (2) City of Carlsbad, Public Works Department, Attention: Mr. Casey Amdt
(2) Lennar Communities, Attention: Mr. Noah Ashbrook
-2-
Leighton
971009-017
APPENDIX A
Laboratory Testing Procedures and Test Results
"R"-Value: The resistance "R"-value was determined by the California Materials Method No. 301
for subgrade soils. The samples were prepared and exudation pressure and "R"-value determined on
each one. The graphically determined 'R"-value exudation pressure of 300 psi is summarized in the
table below:
Sample Location Sample Description R-Value
PA- 13 RV Parking Area and Olive-brown lean CLAY 9 Entry Road (Station 2+15)
PA -13 RV Parking Area and Olive-brown lean CLAY 16 Entry Road (Station 1+25)
A-i
Leighton