HomeMy WebLinkAboutCDP 02-28; KIKO RESIDENCE; BLUFF EDGE DETERMINATION; 2002-07-31GEOTECHNICAL EXPLORATION; INC.
SOIL & FOUNDATION ENGINEERING • GROUNDWATER
HAZARDOUS MATERIALS MANAGEMENT • ENGINEERING GEOLOGY
31 July 2002
Frederick and Jessica Kiko
3561 Donna Drive
Carlsbad, CA 92008
Subject: Bluff Edge Determination
Proposed Kiko Residence
2649 Ocean Street
Carlsbad, California
Dear Mr. and Mrs. Kiko:
Job No. 02-8201
In accordance with your request, we are hereby submitting this letter as
clarification of our position regarding determination of the coastal bluff edge at the
subject site.
As previously mentioned in our geotechhical investigation report, we excavated five
test pits and three borings. to help locate the existing coastal terrace bluff edge. As
indicated on the geologic cross-section A-A', we determined that the bluff edge is
located along contour elevation 18 feet above mean sea level (MSL). This point on
the site is where the marine t~rrace deposits slope steeply down to the west and
come in contact with the relatively flat surface of beach sand deposits. The bluff
face is currently covered with iceplant, so it is not visible.
As indicated during our meeting with the City of Carlsbad, our bluff edge evaluation
utilized information included in the "Coastal Bluffs and Beaches Guidelines," dated
February 1, 1996.
According to the referenced report, " ... the bluff edge means the upper termination
of a b/'uff face where the down gracfient pf the top of the bluff increases more or
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Kiko Property
Carlsbad; California
Job No. 02-8201
Page 2
less continuously, until it reaches the general gradient of the bluff face. The bluff
edge· is the upper termination of a bluff face. When the top edge of the bluff is
rounded away from the bluff face, the edge ·shall be defined as the point at the top
of bluff nearest the bluff face beyond which the downward gradient of the land
surff,ice increases more or less continuously until it reaches the general gradient of
the bluff face.~'
This statement refers to the portion along the top of bluff that is actually rolling
over to meet the bluff face. On the Kiko property, this point is at the 18 feet
elevation contour. As such, it is our opinion that the mapped bluff edge is correct
and should be adhered to in determining the co'nstruction setbacks for this project.
This opportunity to be of service is sincerely appreciated. Should you have any
questions regarding this matter, please feel free to contact our office. Reference to
our Job No. 02-8201 will help to expedite a response to your inquiries.
Respectfully submitted,
GEOTECHNICAL EXPLORATION, INC.
Jay~ isei-; Senior Project Ge
JKH/LDR/pj