HomeMy WebLinkAboutCD 2017-0013; THE BEACON; VEGETATION OF EXISTING SLOPE REVISION; 2013-01-28-
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January 28, 2013
Project No. 107302002
Mr. Geoffrey Sherman
Excel La Costa LLC
17140 Bernardo Center Drive, Suite 300
San Diego, California 92128
Subject: Vegetation of Existing Slope Revision
La Costa Towne Center
El Camino Real and La Costa Avenue
Carlsbad, California
References: Ninyo & Moore, 2012, Geotechnical Evaluation, La Costa Towne Center, El Camino
Real and La Costa Avenue, Carlsbad: dated July 13.
Ninyo & Moore, 2012, Vegetation of Existing Slope, La Costa Towne Center,
El Camino Real and La Costa Avenue, Carlsbad: dated November 5,
Dear Mr. Sherman:
In accordance with your request, this letter has been prepared to address the City of Carlsbad
comments regarding the establishment of vegetation and irrigation system on the existing slope
along the eastern boundary of the project to address slope surface erosion.
As indicated in the referenced geotechnical evaluation report, the eastern slope was constructed
with a buttress fill slope at the bottom of the slope to stabilize the upper cut portion due to ad-
verse bedding conditions. Additionally it was noted in the report that seepage has occurred
through the existing retaining walls and shallow ground water is present.
Observation of the slope has noted an established growth of trees but a lack of ground cover needed
for surface erosion stability. From discussion with the landscape architect, ground cover cannot be
established due to the Eucalyptus trees. In lieu of new plant life, a jute erosion control mat with wood
mulch is proposed on the surface of the slope. This will dissipate water movement and mitigate sur-
face erosion. Excessive or long term irrigation may adversely effect the stability of the overall slope.
We appreciate the opportunity to be of service on this project.
Respectfully submitted,
NINYO & MOORE
0 14o.042204 — Ronald S. Halbert, PE
Senior Engineer \
RSH/KI-IM/gg
Distribution: (1) Addressee
Kenneth H. Mansir, Jr.,
Principal Engineer
No.2739 'lm
5710 Ruffin Road • San Diego, California 92123 • Phone (858) 576-1000 • Fax (858) 576-9600
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