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PACIFIC RIM ENGINEERING, INC.
July 9, 1992
1345
Scher-Voit
4370 La Jolla Village Drive
Suite 120
San Diego, CA 92122-1233
Attn: Robert L. Wineteer
Re: Ocean Bluff, Carlsbad, California
ACCESS ANALYSIS
Background
Existing Conditions
Single Access Policy
Per your request, I have made a preliminary study of access
options for your proposed Ocean Bluff project in Carlsbad,
California. Given the time frame and the instructions from your
other consultants, I have assumed for the purposes of this
analysis that the main constraint to providing access will be
conformance to the City of Carlsbad Engineering Department
Policy No. 1 on Single Entrance (Cul-de-sac) Development
(attached).
The two most likely points from which improved physical
access could be provided to the site at this point are the
intersection of Poinsettia Lane and Alga Road, and the
northerly terminus of Blackrail Road. A dirt access road in the
San Diego Gas & Electric Co. easement provides access to
West Oaks Way and Palomar Airport Road, but this access
could not be improved to meet City street standards.
The City of Carlsbad Engineering Department Policy on Single
Access Development enumerates the conditions under which it
is acceptable for a development to have only one entrance.
The goal of the policy is to ensure adequate traffic circulation
and fire access. For the purposes of the Ocean Bluff project,
subsections 2 and 3 apply. Subsection 1 is for local streets
with driveways, and allows a maximum length of 600 feet, or
1200 feet with special permission from the City Engineer. Due
to the size and layout of the project, without an internal through
connection, no significant portion of the project can be built
within the guidelines given.
1025 Service Place, Suite 103 • Vista, CA 92084 • (619) 941-7500 • FAX: (619) 941-9203
Ocean Bluff Access Analysis
July 9,1992
Page 2
Subsection 2 Analysis
Subsection 3 Analysis
Subsection 2 of the Single Entrance Policy allows for a single
entry point when a the access is a 40-foot curb-to-curb local
street and the following conditions are present:
Q Driveways and intersections are spaced at least 150
feet apart.
Q The length along streets from entrance to most remote
point does not exceed 1 /2 mile.
Q The traffic volume at entrance is 1200 ADT or less.
Q The number of dwelling units is 120 or less.
Because of the requirement that there be very few driveways or
intersections, this subsection is basically intended for an offsite
access road. The Ocean Bluff project meets the traffic volume
and dwelling unit criteria. From the project to existing
Poinsettia is 0.3 miles from the most westerly entrance, and a
total of 0.52 miles from the easterly entrance. The offsite
portion of a 40-foot wide road along the Poinsettia Lane
alignment could meet all the criteria. However, the onsite
portion of the project could not meet the first two criteria
without having another access point. The Blackrail alternative
poses similar problems. From the intersection of Blackrail and
Alga to the project site is approximately 0.6 mile. To the most
remote point within the project is another 0.3 mile.
Subsection 3 of the Single Entrance Policy allows for a single
entry point when the access is a 4-lane secondary or major
arterial with a raised median and the following conditions are
present:
Q The length of the street does not exceed 1 /2 mile.
d The traffic volume at entrance is 3000 ADT or less.
O The net buildable lot area served by the street does not
exceed 25 acres.
Since Poinsettia Lane is shown as a major arterial per the
Specific Plan, extending Poinsettia to the site would fulfill the
general condition of Subsection 3. If Poinsettia was extended
to the proposed easterly project entrance, and the westerly
entrance was constructed, the point of single access would
become the westerly entrance. For all points east of the
westerly entrance, there would be two access points. Therefor,
the distance of 0.3 mile to the westerly entrance from the
existing Poinsettia/Alga intersection would meet the 1/2 mile
criteria. The traffic volume at the entrance would be 970 ADT
from the proposed 97 lots, under the 3,000 ADT allowed.
Taking only the Ocean Bluff project into account, the net
buildable area could be approximated as follows:
Ocean Bluff Access Analysis
July 9,1992
Page3
Combination Alternative
Conclusion
Gross area 31.0 ac.
less unbuildable open space -2.4 ac.
less 'Phase II' (sewer lowest) -4.8 ac.
less streets -4.6 ac.
Net buildable lot area 19.2 ac.
Thus, the buildable lot area is within the limits established by
the policy also.
Based upon the analysis of Subsection 3, it appears that
constructing a full section of Poinsettia Lane would meet the
requirements of the single entry policy, and would be suitable
for access to the project. While an estimate of construction
costs is beyond the scope of this analysis, the costs of
constructing a full width major arterial would be considerable.
If Blackrail Road was extended and a partial width of Poinsettia
were both constructed, then the project would have internal
circulation, and the single entry policy would not apply.
Discussions with the City of Carlsbad would be necessary to
determine probable improvement requirements, then the
construction costs and cost sharing opportunities would have
to be evaluated to determine the best course of action.
While further analysis is necessary, it appears as if a
combination of improving both Poinsettia and Blackrail would
be the best solution to providing access to the project. The
main access would be Poinsettia, most likely graded to full
width, and constructed to half-street standards, up to the
westerly project entrance. Then access would continue
through the project, connecting up with Blackrail Road at the
southeasterly corner. Blackrail Road would be improved to 24-
foot wide paving as secondary access. The Ocean Bluff
project would either construct or secure the improvements of
Poinsettia Lane within the subdivision boundary. The offsite
construction of Poinsettia would stop at the westerly project
entrance. This concept is shown on the attached sketch.
Ocean Bluff Access Analysis
July 9, 1992
Page 4
Respectfully submitted,
PACIFIC RIM ENGINEERING, INC.
Glen K. Van Peski
Principal
GVPrbhs
enc.
cc: Tony Lawson, ADL Planning Associates (enc.)
Jack Henthorn, Jack Henthorn & Associates (enc.)
CITY OF CARLSBAD
ENGINEERING DEPARTMENT POLICY
NUMBER:
EFFECTIVE:
SUPERSEDES:
1
12/20/90
9/5/84
SUBJECT:
SINGLE ENTRANCE (CUL-,DE-SAC) Development
A""7^^^4^LLOY'D B.I HU^B^^CITY ENGINEER
PURPOSE:
To establish a set of conditions under which it is acceptable for
a development to have only one entrance while ensuring adequate
traffic circulation and fire access.
POLICY:
Single entry point (cul-de-sac) developments shall be permitted
only when the cul-de-sac street is:
A 30-foot or 32-foot curb-to-curb private street, a 36-foot or
40-foot curb-to-curb residential street and all the following
conditions are met:
a. Length of street does not exceed 600 feet.*
b. Traffic volume at entrance does not exceed 500 ADT.
c. Number of dwelling units does not exceed 50.
*Length may be increased to a maximum
special permission of the City Engineer.
of 1200 feet with
A 40-foot curb-to-curb local street and all of the following
conditions are met:
a. Driveway and street intersections are spaced 150 feet or
more apart.
b. The length along streets from entrance to most remote
point does not exceed one-half mile.
c. Traffic volume at entrance does not exceed 1200 ADT.
d. Number of dwelling units does not exceed 120.
A 4-lane secondary or major arterial with a raised median and
all of the following conditions are met:
a. The length of street does not exceed one-half mile.
b. Traffic volume at entrance does not exceed 3000 ADT.
c. The net buildable lot area served by the street does not
exceed 25 acres.
A 52-foot wide curb-to-curb industrial street and all of the
following conditions are met:
a. The length of street does not exceed one-half mile.
b. Traffic volume at entrance does not exceed 3000 ADT.
c. The net buildable lot area served by the street does not
exceed 25 acres.
TYPICAL £>eCT)ONS
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PACIFIC RIM ENGINEERING, INC.
1025 SERVICE PLACE • SUITE 103 • PH: (619) 941-7500
VISTA, CALIFORNIA 92084 • FX: (619) 941-9203