HomeMy WebLinkAbout3307; CARLSBAD BLVD SHORE PROTECTION; PRELIMINARY REPORT OF SUPPLEMENTAL DESIGN STUDIES; 1991-09-111550 Hotel Circle North
San Diego, CA 92108
(619) 294-9400
Fax: (619) 293-7920
Woodwarc-.Iyde Consultants
September 11, 1991
Project No. 9051141E-0005
Mr. John J. Cahill
Municipal Projects Manager
City of Carlsbad
2075 Las Palmas Drive
Carlsbad, CA 92009-4859
PRELIMINARY REPORT OF
SUPPLEMENTAL DESIGN STUDIES
SOUTH REVETMENT AREA
CARLSBAD BOULEVARD SHORE PROTECTION
CARLSBAD, CALIFORNIA
Dear Mr. Cahill:
RECEIVED
SEP 13 1991
MUNICIPAL PROJECTS
DIVISION
In accordance with your request, we are proceeding with additional studies in the area of the
proposed south revetment at the subject project. The purpose of these additional studies is
to evaluate possible alternative methods to a rock revetment in this area. Our supplemental
study includes an additional geotechnical investigation in the area, evaluation of several
vertical seawall alternatives, selection of a preferred alternative, a preliminary cost estimate
of the preferred alternative and an estimate of the area of beach recovered.
We completed our additional field investigation on September 6; 1991 which included a
visual observation of the area, mapping of the location of the toe of the fill and the drilling
of three test borings. Laboratory analysis of the soil samples obtained from the test borings
is in progress.
Based on the preliminary data from the test borings, we have made a preliminary analysis
of three alternative vertical walls:
Steel sheet piles with concrete cap;
Steel H-piles with wood or concrete lagging; and
Reinforced concrete on steel H-pile foundation.
All Of these walls would require a railing on top, toe stone and some stone protection at the
south end.
Consulting Engineers, Geologists
and Environmental Scientists
Offices in Other Principal Cities.
Mr. John J. Cahill Wo Nard•Clyde Consultants
City. of Carlsbad
September 11, 1991
Page 2
The preliminary preferred vertical wall is the steel sheet piles with a concrete cap, similar
to the walls proposed for the north and middle portions of the project. The wall would
extend along the existing approximate + 16 feet contour. It would be approximately 360 feet
long and turned-in about.5 to 10 feet at each end. An aluminum railing would extend along
the top of the wall. It is estimated that the cost would be approximately $400,000 to
$450,000 (as compared to $300,000 for the rock revetment). The fill in front of the wall
could be regraded to an approximate elevation of +11 to + 12 feet and reclaimed as beach
area. It is estimated that the reclaimed area would be approximately 3,500± square feet.
It is further suggested that the proposed rock ramp for the lifeguards be deleted.
A typical Section and Plan are attached for your information, please call if you have any
questions.
Very truly yours,
cz-
LouisARD-CLYDE CONSULTANTS
R.C.E. 14129
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1550 Hotel Circle North DATE q//0/9 / San Diego, California 92108
DRAWN BY ____
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PROJECT NAME CAL,S I&AID E0L.V490 £I4O.E O1CT1O'/ CHECKED BY