HomeMy WebLinkAboutCT 98-15; Rancho Carrillo Village B Phase II; Tentative Map (CT) (25)OCT 221998
GEOCON
INCORPORATED
GEOTECHNICAL CONSULTANTS
Project No. 05845-12-16
October 21, 1998 DECEIVED
OCT 28 1998
r t. ID KT CITY OF CARLSBADContinental Ranch, Inc. *"* ... (^ n»»^^.
12230 El Camino Real, Suite 300 PLANNh\« ^-~f I
San Diego, California 92130
Attention: Mr. Dave Lother
Subject: VILLAGE B (LOT 206)
RANCHO CARRILLO
CARLSBAD, CALIFORNIA
FUTURE SITE GRADING
Reference: 1. Final Report of Testing and Observation Services During Site Grading, Village B,
Rancho Carrillo, Carlsbad, California, prepared by Geocon Incorporated, dated
September 25, 1998
2. Tentative Map/Condominium Permit Site Development Plan, Rancho Carrillo
Village B-Phase 2, prepared by Hunsaker & Associates, stamp dated
September 29, 1998
Gentlemen:
In accordance with your request, this letter has been prepared to respond to a grading issue raised by
the City of Carlsbad regarding Village B within the subject development. Specially, the issue related
to the stability of the slope along the south property line adjacent to Village A.
Review of the grading report (Reference 1) indicates that Village B is currently sheet-graded. Along
the common south margin with Village A, a fill slope has been graded at a 2:1 (horizontal:vertical)
inclination with a height of up to approximately 8 feet.
Future grading planned for the development of Village B (Lot 206) will result in increasing the
finish grade up to approximately 4 feet above the sheet-graded elevation. This will create a
maximum slope height on the order of 12 feet.
Conventional grading procedures will be implemented during the proposed finish grading of
Village B. In that this work may not occur until next year, the existing surficial soils will be
scarified, moisture conditioned, and properly recompacted prior to receiving additional fill soils. All
fill soils, including those in slope zone, will be placed in shallow lifts and compacted to at least 90
percent relative compaction (ASTM D1557-91). The slopes will either be overbuilt and trimmed
back or track-walked to achieve proper compaction to the face of the slope. These procedures will
6960 Flanders Drive • San Diego, California 92121-2974 • Telephone (619) 558-6900 • Fax (619) 558-6159
"tie in" the existing fill soils with the new fill and provide slope stability. Grading operations will be
performed under the testing and observation services of Geocon Incorporated personnel. Site
preparation by the grading contractor will also be observed and approved by the project geologist.
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
CEG 1778
DFL:AS:dmc
(3) Addressee
CERTIFIED
ENGINEERING
GEOLOGIST
08/31/99
/id F. L
RCE 22527
Project No. 05845-12-16 -2-October 21,1998