HomeMy WebLinkAboutCT 04-04; LA COSTA RIDGE NEIGHEBORHOOD 2.5; BUILDING PAD VERIFICATION LETTER LOTS 33-60; 2010-02-17CI 04-04
GEOCON
N C 0 N P 0 II A T E I)
GEOTECI-INICAL CONSULTANTS
Project No. 07290-52-13
February 17, 2010
City Ventures
4850 Red Hill Avenue, Suite 200
Santa Aria, California 92750
Attention: Mr. Matthew Jansen
Subject: VILLAGES OF LA COSTA - THE RIDGE
NEIGHBORHOOD 2.5, LOTS 33 THROUGH 50
CARLSBAD, CALIFORNIA
BUILDING PAD VERIFICATION LETTER
References: 1. Final Report of Testing and Observation Services Performed During Site Grading,
Villages of La Costa - The Ridge, Neighborhood 2.5, Carlsbad, California,
prepared by Geocon Incorporated, dated December 29, 2005 (Project No. 07290-
52-01).
2. Updated Seismic Design Parameters and Post-Tensioned Design Criteria,
Villages of La Costa - The Ridge, Neighborhood 2.5, Lots 33 through 66,
Carlsbad, California, prepared by Geocon Incorporated, dated November 6, 2009
(Project No. 07290-52-13).
Dear Mr. Jansen:
In accordance with the request of Mr. Greg Jones, we have prepared this letter to summarize our
observation and testing services performed on the subject lots to facilitate building construction.
Geocon Incorporated provided observation and compaction testing services during re-grading of the
subject lots. To summarize, the upper approximately 1-foot of previously placed compacted fill was
scarified, moisture conditioned, and recompacted in order to re-establish a finished lot condition
prior to building construction. The building pad portions of Lots 33 through 50 have been recently
completed. The re-grading operations for the remaining lots are on-going. A final report of testing
and observation services, including the field and laboratory test results, will be prepared once the
remainder of the re-grading has been completed.
In-place density tests were performed using a nuclear gauge in accordance with ASTM Test
Designation D 2922-05. Laboratory compaction tests were performed on soil samples in accordance
with ASTM Test Designation D 1557-07. Results of the in-place density tests indicate that the
compacted fill materials possess a dry density of at least 90 percent of the laboratory maximum dry
density near to slightly above the optimum moisture contents at the locations tested.
6960 Flanders Drive IN Son Diego, California 92121-2974 E Telephone (858) 558-6900 U Fax (858) 558-6159
Trevor E. Myer5
RCE 63773
TEM:DBE:dmc
(2) Addressee
(email) City Ventures
Attention: Mr. Greg Jones
Based on our observations and test results, it is the opinion of Geocon Incorporated that the soil
engineering and engineering geologic aspects of the grading are in compliance with the
recommendations of the referenced geotechnical reports and the geotechnical requirements of the
grading permit and plans. The conclusions and recommendations presented in the referenced reports
remain applicable unless superseded herein.
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
DAVID &
0 EVN4S r No. 1860 a.. CER11FIED * * ENGINEERING
GEOLOGIST
David B. Evans
CEG 1860
February 17, 2010