HomeMy WebLinkAboutCDP 98-39; Faraday Road Extension; Coastal Development Permit (CDP) (8)March 11,1999
TO: CITY MANAGER
FROM: ASSOCIATE
VIA: PUBLIC WORKS DIRECTO
3593 - FARADAY AVENUE EXTENSION
GNATCATCHER HABITAT IMPACTS TO COASTAL SAGE SCRUB 5% ALLOCATION
SECTION 4(D) PROCESS
An additional take of 0.6 acres of coastal sage scrub is required to construct Faraday Avenue.
A memo from the engineer is attached describing the additional take. The City Council
reserved the remaining 4.77 acres of coastal sage scrub from the 5% allocation in an previous
action. Final design has been completed and the coastal sage scrub lake" has been
determined to be 0.6 acres. Removal of the 0.6 acres from the 5% Allocation reserved for
various Capital Improvement Projects leaves 4.17 acres. The attached table has been updated
to reflect this allocation.
The Mitigated Negative Declaration for the project requires 2:1 mitigation through the purchase
of land from an established mitigation bank. Staff is proposing to purchase the 1.2 acres from
the Manchester Avenue Mitigation Bank.
It is recommended that the City Manager approve the permanent deduction of 0,6 acres
from the City's 5% allocation for the Faraday Avenue Extension project.
Attachment:
1. Itemization of Impacts to Coastal Sage Scrub 5% Allocation
c. Community Development Director
Principal Planner - Don Rideout
Traffic Engineer
Principal Civil Engineer - Richard Allen
Associate planner - Christer Westman
Raym
City M
Itemization of Impacts to Coastal Sage Scrub 5% Allocation
3/11/997:54
Description of Project
Starting Balance
City and Other Public Agency Projects:
San Dieguito Union High School District for South Carlsbad High School site.
Section 7 permit issued, 1 993
CalTrans for Poinsettia Lane/1-5 Freeway ramps and auxiliary lanes. Section
7 permit issued, 1 995
CMWD- lining and covering of Maerkle Reservoir - 4(d) permit issued, 1995
Poinsettia Park - 4(d) permit issued, 1 995
Cannon Road Reach 1 - 4(d) permit issued 1 995
Hidden Valley Road - Section 7 permit issued 1 995
Maerkle Reservoir - additional impacts 1 997
Cannon Road Reach 2 - 4(d) permit issued 2/97
La Costa Avenue Widening - Section 7 1 998
Poinsettia Lane Extension - Admin. 4(d) Pending 7/98
Skateboard Park - Approved administratively 8/98
FARADAY AVENUE - 4(d) issued 12/98
El Camino Real widening — 4(d) issued 12/98
Reserved for various capital projects
FARAD A Y A VENUE ADDITIONAL IMPA CTS
Private Development Projects:
Aviara Phase II drainage structure impacts - 1994
Aviara Phase III grading - 4(d) permit issued 9/95
Parkview West - 4{d) permit issued May 1 996
Carlsbad Ranch - 4(d) permitissued May 1 996
3ancho Verde - Section 7 permit issued 1995
vlar Vista/Emerald Ridge West and East - approved administratively 1 1 /95
Carrillo Ranch Phase 1 Grading - Section 7 permit issued 1 995
Arroyo La Costa - Section 7 permit issued 1 993
Cobblestone Sea Village- 4(d) permit issued 1 /97
Holly Springs agricultural impacts 1997
Carlsbad Ranch - Hidden Valley Road approved administratively 1 997
Cobblestone Sea Village additional impact approved administratively 10/97
Carrillo Ranch Phase II Grading - authorized 1 1 /97
Meadowlands - 4(d) permit issued 3/98
Pacific View Estates • 4 Id) permit issued 3/98
Ocean Bluff - 4(d) Issued 3/98
La Costa Village ~ 4(d) Issued 4/98
Green Valley El Camino Real Widening - 4{d) Approved 6/98
Ayres Land Co. - Aviara Parkway - Pending 4(d) 6/98
Newton Business Center - 4{d) approved administratively 6/98
Kelly Ranch Area E~ Shea Homes - 4{d) Pending 7/98
Lincoln North Pointe/ViaSat - Approved administratively 7/98
Agua Hedionda Visitors Center - 4(d) Pending 10/98
Total acres authorized to be taken
Remaining acres
Acres
165.70
1.46
2.10
4.30
0.04
2.40
6.32
0.53
1.98
0.10
0.35
0.30
5.50
0.35
4.17
0.60
0.40
8.68
1.10
1.10
6.80
0.96
42.20
11.00
14.60
0.50
|_ 0.27
0.10
28.00
1.30
1.95
3.98
1.70
2.38
3.40
0.78
2.66
0.35
0.99
165.70
0.00
Note: Italics indicates that grading permit has not been issued
03-09-1999 04:07Pn FROM -O'Day Consultants TO — 4315769 P.01
C 0 N f> U L T A/N T S
TRANSMITTAL LETTER
TO: City of Carlsbad DATE: 3/9/99 JOB NO: 97-1050-C1
2075 Las Palmas PROJECT: Faraday Avenue Grading
Carlsbad, CA 92009 RE: Project Memo
ATTN: Sherri Howard DWG: 369-2
CONTRACT NO: 3593
TRANSMITTED VIA: FAX PHONE NO.: (760) 438-1161
FAX NO.: (760) 431-5769
Dear Sherri,
As you well know the above referenced project is currently out to bid with an expected bid
opening date of March 18,1999. During the request for information process a potential bidder
identified a problem with the 1%:1 slopes proposed on the north side of the road. The deep
stabilization fills required by the soils engineer for these slopes creates backcuts that encroach
beyond the limit of work line and into the Diegan Coastal Sage Scrubb (DCSS).
The encroachment is similar to that of using 2:1 slopes thus erasing the benefit of using 1 V&1
slopes to minimize impacts to DCSS. It is also true that the stabilization fills for the 1 V4:1 slopes
require the placement of geogrid reinforcement at a significant cost again without the benefit of
reduced impacts.
As a design solution we have identified that we can return to 2:1 slopes with rounded slopes
which will result in taking 0.4 acres of additional DCSS. We have also identified that the height
of these 2:1 slopes will require a 15' backcut at the top resulting in an additional removal of 0.2
acres of DCSS for a total taking of 0.6 acres. This will require creating an additional 1.2 acres
of DCSS onsite with the current mitigation program.
It is our opinion that the cost for the additional take and resulting mitigation will be far less than
the cost for the steeper slopes with stabilization. It is also true that the amount of total
excavation in these areas will be less because the reduction in backcut quantities offsets the
increased excavation for the flatter slopes.
Enclosed is an exhibit that shows the slopes in question and the additional DCSS taking.
John P. Strohminger
Project Manager
5900 Pasteur Court CivU Engineering
Suite 100 Flaming
Carlsbad, California 92008 Processing
760-931-7700 Surveying
Fax: 760-931-3680 E-nvttL-oday@odaycotuutiants.com
FARADAY AVENUE
ADDITIONAL DCSS REMOVAL
0.2 ACRES DCSS REMOVAL
0.4 ACRES DCSS REMOVAL
TOTAL ADDITIONAL TAKE* 0,6 ACRES
50' 200'
SCALE: 1" = 100'
CONSULT
9900 Po*t«ur Court
Suite 100
Carlsbad, California 92008760-931-7700
Fax: 760-931-8080
Civil Engineering
PlanningProcessing
Surveying
91999 O'Oav Consultants. Inc.F'\JDBS\971050\9750Z033 3-10-99 3'16'57 pn EST
FARADAY AVENUE
STABILITY BACK-CUT STUDY
CONS U L T VTsl T S
5900 Postaur Court Civil Engineering
Suite 100 Pfenning
Carlsbad. California 92008 Processing
760-931 - 7700 Surveying
Fax: 760-931-8680