HomeMy WebLinkAboutCT 06-27; MUROYA SUBDIVISION; GEOTECHNICAL REVIEW COMMENTS; 2009-07-10GEOCON
INCORPO RATED
Project No. 07671-52-01
July 10, 2009
GEOTECHNICAL CONSULTANTS
Taylor Woodrow Homes Incorporated
15 Cushing
Irvine, California 92618
Attention: Ms. April Tornillo
Subject: MUROYA PROPERTY
CARLSBAD, CALIFORNIA
RESPONSE TO REVIEW COMMENTS
References: 1. Preliminary Geotechnical Investigation, Muroya Property, Carlsbad, California,
prepared by Geocon Incorporated, dated January 25, 2007 (Project No. 07671-52-01).
2. Memorandum - Completeness and Issues Review, Muroya Residential Subdivision,
Calrsbad, California, prepared by The City of Carlsbad, dated June 23, 2007.
Dear Ms. Tornillo:
In accordance with your request, we have prepared this letter to address the referenced review
comments prepared by The City of Carlsbad. Specifically, this letter is intended to address Planning
Issue 5. The issue is listed below with the response immediately following.
Item 5: Geotechnical. Please provide a supplemental letter from the geotechnical consultants
specifically addressing Section 21.203.040(3) (a) of the Coastal Resource Protection
Overlay Zone, which discusses slope stability for a period of at least 75 years, or the
life of the structure.
Response: The referenced geotechnical investigation presents a slope stability analysis of the
planned slopes with a calculated factor of safety of at least 1.5, which is common
standard of practice. We expect the planned slopes can maintain a factor of safety of at
least 1.5 if the site conditions remain the same for 75 years subsequent to our testing
and observation services during the planned grading operations. We can not guarantee
that the slopes will be stable for the requested time period Water flowing over the top
of slope, infiltration of water from heavy rain, broken utility lines, excessive landscape
irrigation or failed drainage devices can reduce the calculated factor of safety of the
slopes.
Should you have questions regarding this letter, or if we may be of further service, please contact the
undersigned at your convenience. 0
Very truly yours, Z
GONOOTE>
VA W
Timo yy P. Malley, XS-hawn don 0 No. 2714
Staff Geologist GE 2714 Exp.06130/11 )prnjj
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(e-mail) Hunsaker & Associates
Attention: Mr. Chuck Cater
6960 Flanders Drive • San Diego, California 92121-2974 U Telephone (858) 558-6900 U Fax(858) 558-6159