HomeMy WebLinkAboutCT 00-06; BRESSI RANCH; ADDENDUM TO THE AS-GRADED REPORTS OF MASS GRADING CONCERNING THE COMPLETION OF SETTLEMENT MONITORING, PLANNING AREAS PA-1 THROUGH PA-5; 2004-10-11Leighton and Associates, Inc.
A LEIGHTON GROUP COMPANY
To:
Attention:
Subject:
October 11, 2004
Lennar Communities
1525 Faraday A venue, Suite 300
Carlsbad, California 92008
Mr. John Slatton
Project No. 971009-014
Addendum to the As-Graded Reports of Mass Grading Concerning the
Completion of Settlement Monitoring, Planning Areas PA-I through PA-5, Bressi
Ranch, Carls bad, California
In accordance with the project geotechnical recommendations, settlement monuments were
installed within the deep fill areas upon the completion of the fine grading operations for
Planning Areas PA-1 through PA-5 of the Bressi Ranch project, located in Carlsbad, California.
It should be noted that although this letter is applicable to Planning Areas PA-1 through PA-5,
there are no deep fill areas within Planning Areas PA-I and P A-4.
A total of seven settlement monuments were installed within the deep fill areas (i.e. fills
generally greater than 40 feet in depth) within Planning Areas P A-1 through P A-5 and one
additional monument (Monument 2-1) was placed in a cut area to provide a benchmark. The
settlement monuments were surveyed generally on a twice monthly to monthly basis for a
minimum period of five to six months. The settlement monitoring data for each of the monuments
is attached.
Based on our evaluation of the survey data obtained from the settlement monuments placed in
Planning Areas PA-1 through PA-5 of the Bressi Ranch project, it is our professional opinion
that the primary settlement of the fill soils is essentially complete. Therefore, from a geotechnical
standpoint, construction of the improvements within Planning Areas PA-1 through PA-5 may
begin. Consequently, survey readings of the monuments can be discontinued and the monuments
may be removed. The settlement of the deep fill areas within Planning Area P A-3 was previously
evaluated and determined to be essentially complete (Leighton, 2004d).
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J. T. KRUER 8, COMPAN~ I
3934 Murphy Canyon Road, Suite 8205 • San Diego, CA92123-4425
858.292.8030 • Fax 858.292.0771 • www.leightongeo.com
971009-014
Secondary consolidation settlement of the fill soil may continue; however, future settlements are
expected to be less than 1 to 3 inches depending upon the location within Planning Areas PA-1
through PA-5. Based on the recommendations provided in the two as-graded reports for Planning
Areas PA-1 through PA-5, total future settlement is expected to be order of 1 to 3 inches and
differential settlement is estimated to be on the order of 1/2 inch in 25 feet (Leighton, 2004a and
2004b ). Long-term settlement values and the affects on site development should be evaluated
after the site is fine graded and the actual location of the proposed structures and site
improvements are known and the fill thicknesses determined.
Attachments: Appendix A-References
Settlement Monitoring Data Results
Distribution: (2) Addressee
Respectfully submitted,
LEIGHTON AND ASSOCIATES, INC.
je/d{__{) ~J_ __ _
William D. Olson, RCE 45283
Senior Project Engineer
~K-~ti,~
Senior Associate
(6) Sares Regis Group, Attention: Mr. Patrick Russell
-2 -
Leighton
971009-014
Appendix A
References
Leighton and Associates, 2004a, As-Graded Report of Mass Grading, Planning Areas P A-1, PA-
2, and PA-3, Metropolitan Street, and a Portion of Town Garden Road, Gateway
Road, and Alicante Road, Carlsbad Tract No. 00-06, Bressi Ranch, Carlsbad,
California, Project No. 971009-014, dated April 15, 2004
, 2004b, As-Graded Report of Mass Grading, Planning Areas PA-4 and PA-5,
Innovation Way and a Portion of Gateway Road, Carlsbad Tract No. 00-06,
Bressi Ranch, Carlsbad, California, Project No. 971009-014, dated May 25, 2004
, 2004c, Status of Deep Fill Settlement Monitoring, Planning Areas P A-1 through
PA-5, Bressi Ranch, Carlsbad, California, Project No. 971009-014, dated August
24,2004
, 2004d, Addendum to the As-Graded Report of Mass Grading Concerning the
Completion of Settlement Monitoring, Planning Area PA-3, Bressi Ranch,
Carlsbad, California, dated August 26, 2004
A-1
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Settlement Monitoring Data
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Settlement Monitoring Data
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Monument destroyed as of 03/31/04 and re-installed on 05/13/04
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10/11/2004