HomeMy WebLinkAbout3348; Poinsettia Park Sewer; Poinsettia Park Sewer; 1995-04-28CARLSBAD MUNICIPAL
• WATER DISTRICT
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POINSETTIA PARK SEWER
I CMWD PROJECT NO. 94-403
E RECOMMENDED ALIGNMENT REPORT
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APRIL 28, 1995
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• SUBMITTED BY:
DANIEL BOYLE ENGINEERING, INC.
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DANIEL BOYLE ENGINEERING, INC.
Civil Engineering Services
CARLSBAD MUNICIPAL WATER DISTRICT April 28, 1995
5950 El Camino Real
Carlsbad, CA 92008
Attention: Mr. William E. Plummer, P.E.
District Engineer
Carlsbad Municipal Water District
Poinsettia Park Sewer
CMWD Project No. 94-403
Recommended Alignment Report
We are pleased to present herein our Recommended Alignment Report for the
Carlsbad Municipal Water District (CMWD) Poinsettia Park Sewer.
On April 7,1995 we completed and submitted to CMWD our Draft Alignment Study
for the Poinsettia Park Sewer. That report included an analysis of three alternative
alignments. Two of the alternative alignments, Alternatives A and B, included an
analysis of each alternative with and without sewer service to the proposed Abada
Costa Do Sol development located adjacent to and south of the proposed
Poinsettia Park. The basis of the analysis for inclusion of the Abada development
was that the connection manhole at the upstream end of the Poinsettia Park Sewer
would have an invert elevation of 123.7-feet above sea level. This resulted in a
maximum depth of the Poinsettia Park Sewer as it passed through the McReynolds
property of 38.7-feet.
On April 15, 1995 we received from CMWD written comments on our Draft
Alignment Study and met with District Staff on April 19, 1995 to review the
comments received.
We were informed that the Abada development has revised the grading concept
for their property to where the connection manhole would be raised by
approximately 10-feet to elevation 133.0-feet above sea level. We were also
informed that because of this and environmental concerns with Alternative
Alignments B and D that the CMWD has decided to adopt Alternative A with
inclusion of the Abada development as the project to be constructed.
3142 Vista Way, Suite 209 Oceanside, CA 92056 (619) 433-8710 FAX (619) 433-9709
CMWO - Poinsettia Park Sewer Project No. 94-403 - 4/28/95 - Page 2
We were directed to prepare this Recommended Alignment Report to describe the
proposed alignment, developments to be served by the Poinsettia Park Sewer and
the estimated construction cost of the project.
Enclosed herein is our final Recommended Alignment Report for the Poinsettia
Park Sewer. If you have any questions or need additional information, do not
hesitate to call.
NIEL BOYLE ENGINEERING, INC.
Daniel B. Boyle, P.E
Managing Engineer
DBB:lam
End.
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CARLSBAD MUNICIPAL WATER DISTRICT
POINSETTIA PARK SEWER
CMWD Project No. 94-403
TABLE OF CONTENTS
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SECTION
1.0
2.0
3.0
4.0
5.0
PLATE NO.
SERVICE AREA
PAGE
.. 1
RECOMMENDED ALIGNMENT 3
ENVIRONMENTAL CONCERNS/PERMITS/CEQA
EASEMENTS 6
CONSTRUCTION COST ESTIMATES
1 SERVICE AREA & RECOMMENDED ALIGNMENT
2 PRELIMINARY PIPELINE PROFILE
Follows
Page
1
3
APPENDIX
A DRAFT ALIGNMENT STUDY FOR POINSETTIA PARK SEWER,
CMWD PROJECT NO. 94-403
Prepared By Daniel Boyle Engineering, Inc., Dated April, 1995
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1.0 SERVICE AREA
The service area for the Poinsettia Park Sewer is shown on Plate No. 1. The future
developments will consist of four parcels including:
Q McReynolds Property - Future Mar Vista
Ql Future Hidden Valley Estates
Ql City of Carlsbad - Future Poinsettia Community Park
Ql Abada Property - Future Costa Do Sol
The proposed Mar Vista development on the McReynolds property, as shown on Plate
No. 1, includes the tentative sewer alignments within future streets with sewage flowing
towards a cul-de-sac on the north side of the property. From the cul-de-sac, the sewer
would connect to one of two existing interceptor sewers which parallels Palomar Airport
Road and the Price Club property. Improvements for this tract have not yet been
designed and are therefore, subject to change. The development includes 50 single
family homes. The Mar Vista development proposes that 15-percent of the single family
homes will include granny flats over the garages in order to meet its low income housing
requirement. It is estimated that these granny flats will be equivalent to three additional
single family homes from a sewage flow standpoint.
The proposed Hidden Valley Estates development is east of Mar Vista and the future
proposed street pattern and in-tract sewers are as shown on Plate No. 1. All of the
sewage from Hidden Valley Estates can flow into the Mar Vista development. Hidden
Valley Estates includes 60 single family homes.
The proposed Poinsettia Community Park is south of the Mar Vista development. The
proposed improvements to be constructed within Poinsettia Park are shown on Plate
No. 1. The improvements that will contribute sewage flow to the Poinsettia Park sewer
include two restrooms and a maintenance yard. The City of Carlsbad proposes to
construct a gymnasium at some point in time in the future. It is estimated that the
sewage flows from Poinsettia Park facilities, including the future gymnasium, will be
equivalent to three single family homes.
The proposed Costa Do Sol development is south of the Poinsettia Community Park. The
future street pattern and in-tract sewers are as shown on Plate No. 1. Two alternative
sewage flow patterns are possible from the Costa Do Sol development. The first
alternative would include all 119 single family homes to be discharged into the Poinsettia
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SERVICE AREA & RECOMMENDED ALIGNMENT
[^CO-
INTERCEPTOR
SEWERS
SAMBI PROPERTY BRAMALEA PROPERTY
(FUTURE HIDDEN VALLEY ROAD)
CITY OF CARLSBAD
MAINT. T FUTURE/POmSETTlA
COMMUNITY PARK
HIDDEN VALLEY
ESTATES REStROOM
• —^
/OrRESTROQM/ABADA PROPER
FUTURE COST/
EXISTING
LANDSLIDE
McREYNOLDS PROPERTY
FUTURE MAR VISTA
PROPO^EB POIN
SEWE EGEND
PROPOSED SERVICE AREA
PROPOSED POINSETTIA PARK SEWER ALIGNMENT
PROPOSED FLOW DIRECTION
ALTERNATIVE FLOW DIRECTION
SEWER ALIGNMENT IN PROPOSED DEVELOPMENTS
PAMPAS GRASS
PLATE NO. 1
CARLSBAD MUNICIPAL WATER DISTRICT
POINSETTIA PARK SEWER
DANIEL BOYLE ENGINEERING, INC
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CMWD - Poinsettia Park Sewer Project No. 94-403 Recommended Alignment Report - 4/28/95
Park Sewer near the northwest corner of the development. The second alternative would
discharge 69 units to the Poinsettia Park Sewer and the other 50 units flowing south
through an easement into an existing sewer located in Camino De Los Ondas.
Table A below is a summary of the estimated sewage contribution to the Poinsettia Park
Sewer on the basis of equivalent single family homes.
TABLE A
Development
Mar Vista
Hidden Valley Estates
Poinsettia Community Park
Costa Do Sol
Total
Alternative No. 1
53
60
3
119
- 22.55%
- 25.53
- 1.28
- 50.64
235 • 100%
Alternative No. 2
53
60
3
69
- 28.65%
- 32.43
- 1.62
- 37.30
185 • 100%
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CMWD - Poinsettia Park Sewer Project No. 94-403 Recommended Alignment Report - 4/28/95
2.0 RECOMMENDED ALIGNMENT
On April 7,1995 a Draft Alignment Study for Poinsettia Park Sewer was submitted to the
District. A copy of the Draft Study is included in Appendix A. Subsequently, the District
was informed that the Costa Do Sol developers had revised the grading concept for their
project which would raise the elevation of the discharge manhole to be connected to the
upstream end of the Poinsettia Park Sewer by approximately 10-feet. Because of this and
due to environmental concerns with Alternative Alignments B and D as investigated in the
Draft Study, the District has selected Alternative A as the Recommend Alignment with
modifications through Poinsettia Park and minor realignment between Palomar Airport
Road and the Mar Vista development. The District's Recommended Alignment is shown
on Plate No. 1. The preliminary profile of the Recommended Alignment is shown on Plate
No. 2.
Since the Abada discharge manhole has been raised by approximately 10-feet, the
maximum depth of the Poinsettia Park Sewer as it crosses the McReynolds/Mar Vista
property has been decreased from 38.7-feet to approximately 28-feet. This is still far
deeper than normal sewer depths of 8 to 10-feet and will pose special problems to District
Operations Personnel. District Engineering Staff has discussed these problems with
Operations who has determined that they will be able to handle the special operational
and maintenance difficulties associated with a sanitary sewer at this depth.
District Engineering Staff has also discussed with Operations if a parcelled in-tract sewer
should be constructed to sewer the individual homes or if the individual homes should be
connected to the deep Poinsettia Park Sewer. The District has decided that the individual
homes would be connected to the Poinsettia Park Sewer. The lateral design will be
evaluated during the final design phase as will the method of determining the location of
the stubbed off laterals when the actual individual homes are constructed in the future.
If the Poinsettia Park Sewer needs replacement in the future, the District plans on a
slipling process rather than the actual replacement of the pipeline itself. This will eliminate
the major construction impacts which would otherwise result from replacement of a sewer
at such a great depth.
As shown on Plate No. 1, an existing landslide is located at the north end of the
McReynolds property adjacent to and east of the Recommended Alignment. The District
has retained Leighton and Associates, Inc., who have previously done geotechnical work
on the McReynolds property, to evaluate any potential negative impacts due to the slide
on the Poinsettia Park Sewer. This will be addressed in the final design.
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PRELIMINARY PIPELINE PROFILE
PROPERTY FUTURE MAR VISTA DEVELOPMENT
*Z^ *s x8
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52 i*jo _in w
COSTA DO SOL
DEVELOPMENT
EXISTING
GROUND
LINE
PROPOSED
FINISHED SURFACE
SEWER FLOWLINE
10+00 14+00
RECOMMENDED PRELIMINARY PROFILE
PROFILE SCALES:
HORIZONTAL l"=300*
VERTICAL l"=30'
PLATE NO. 2
CA1LSBAD MUNICIPAL WATO DIST1ICT
POINSITTIA PARK SKWK1
DANIEL BOYLX ENGINEERING, INC
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CMWD - Poinsettia Park Sewer Project No. 94-403 Recommended Alignment Report - 4/28/95
The District considered elimination of Manhole No. 2 shown on Plate No. 2 because of
the difficulties of getting an access road to this manhole. The District originally felt that
if in the future the District saw a need for Manhole No. 2 that it would be constructed at
that time. However after further reconsideration, it has been decided to install Manhole
No. 2 during the original construction but seal off the manhole cover.
The District's preference for pipe material is either AWWA C900 or ASTM D3034 PVC
pipe. Each of these materials will be evaluated during final design as to their appropriate
application for the Poinsettia Park Sewer. Also, the abrasive aspects of PVC pipe will be
evaluated for the Poinsettia Park Sewer between Manhole Nos. 2 and 3 due to the steep
12 degree slope.
The District has requested that all manholes deeper than 15-feet be designed with T-Lock
interior lining. Also, the manholes are to be 60-inches in diameter which is standard
District size.
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E Near Palomar Airport Road the sewer will cross a creek. This will require a Corps of
Engineers 404 permit. This permit will be applied for and processed by District
Engineering Staff during design.
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CMWD - Poinsettia Park Sewer Project No. 94-403 Recommended Alignment Report - 4/28/95
3.0 ENVIRONMENTAL CONCERNS / PERMITS / CEQA
As part of the Draft Alignment Study for Poinsettia Park Sewer, copy attached in
Appendix A, our environmental subconsultant RECON prepared Figure 3 which evaluates
the existing vegetation and sensitive resources along the alignment of the alternative
sewer alignments, including Alternative A. Figure 3 shows that at the south end of
Alternative A the sewer would cross through a small portion of Coastal Sage Scrub. With
the addition of Manhole No. 9 as shown on Plate No. 1 and realignment of Alternative A
through Poinsettia Park, the alignment has been moved east and now clears the Coastal
Sage Scrub.
Also shown on RECON's Figure 3 at the north end of Alternative A adjacent to Palomar
Airport Road, the sewer will pass through two small Southern Willow Scrub areas. This
has been discussed with RECON and they have assured us that this will not be of any
major concern to the Resource Agencies and mitigation measures, if any, will be very
minimal.
A coastal permit will also be required for this project and it too will be applied for and
processed by the District.
The CEQA process will also be completed by the District prior to proceeding with
construction.
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CMWD - Poinsettia Park Sewer Project No. 94-403 Recommended Alignment Report - 4/28/95
4.0 EASEMENTS
As shown on Plate No. 1, the Poinsettia Park Sewer crosses the City of Carlsbad
Poinsettia Community Park, the McReynolds property and the Price Club property.
District Engineering Staff has indicated that easements will not be required from the City
of Carlsbad for crossing of the Poinsettia Park but will be required from McReynolds and
Price Club.
District Staff requested a permanent easement covering the pipeline and fairly wide
construction easements. The actual widths of easements will be determined during the
design phase of the Poinsettia Park Sewer.
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CMWD - Poinsettia Park Sewer Project No. 94-403 Recommended Alignment Report - 4/28/95
5.0 CONSTRUCTION COST ESTIMATE
The following Table B is a construction cost estimate for the Poinsettia Park Sewer based
upon recent construction bids for a similar project.
TABLE B
Item
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1. Sewer Pipeline: Station 10+00 to 13+30
2. Sewer Pipeline: Station 13+30 to 17+90
3. Sewer Pipeline: Station 17+90 to 33+80
4. Sewer Pipeline: Station 33+80 to 41 +60
5. Sewer Pipeline: Station 41 +60 to 45+20
6. Manhole Nos. 1 and 2
7. Manhole Nos. 3 through 11 With T-Lock
8. Manhole No. 12
9. Miscellaneous Appurtenances
Quantity
330'
460'
1,590'
780'
360'
2 ea.
9 ea.
1 ea.
LS.
Unit
Cost
$54.00
75.00
117.00
91.00
54.00
3,800
8,100
3.800
LS.
Estimated
Cost
$ 17,820
34,500
186.030
70,980
19.440
7.600
72.900
3,800
61.930
ESTIMATED CONSTRUCTION COST $475.000
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2 APPENDIX A
DRAFT ALIGNMENT STUDY FOR
POINSETTIA PARK SEWER, CMWD PROJECT NO 94-403
I• Prepared By: Daniel Boyle Engineering, Inc.
L Dated: April, 1995
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2 - :. CARLSBAD MUNICIPALL WATER DISTRICT
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r DRAFT ALIGNMENT STUDY FOR
" POINSETTIA PARK SEWER
B CMWD PROJECT NO. 94-403
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_ APRIL, 1995
SUBMITTED BY:
DANIEL BOYLE ENGINEERING, INC.
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CARLSBAD MUNICIPAL WATER DISTRICT
DRAFT ALIGNMENT STUDY FOR
POINSETTIA PARK SEWER
CMWD Project No. 94-403
April, 1995
ry
Prepared By:C
DANIEL BOYLE ENGINEERING, INC.
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E Daniel B. Boyle, P.E
Project Principal
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Jeffrey W. Ohmart, P.E.
B Project Engineer
CARLSBAD MUNICIPAL WATER DISTRICT
POINSETTIA PARK SEWER
CMWD Project No. 94-403
TABLE OF CONTENTS
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SECTION
1.0
2.0
2.1
2.2
2.3
3.0
3.1
3.2
3.3
4.0
4.1
4.2
5.0
6.0
7.0
7.1
7.2
INTRODUCTION
PAGE
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ALIGNMENT ALTERNATIVE A 2
Alignment Alternative A - With Abada 2
Alignment Alternative A - Without Abada 3
Environmental Considerations of Alignment Alternative A 3
ALIGNMENT ALTERNATIVE B 4
Alignment Alternative B - With Abada 4
Alignment Alternative B - Without Abada 4
Environmental Considerations of Alignment Alternative B 4
ALIGNMENT ALTERNATIVE D 6
Alignment Alternative D 6
Environmental Considerations of Alignment Alternative B 6
COST ESTIMATES
PROJECT MATRIX 9
CONCLUSIONS AND RECOMMENDATIONS 11
Conclusions 11
Recommendations 11
APPENDIX
A POINSETTIA PARK SEWER BIOLOGICAL TECHNICAL REPORT
By Recon Regional Environmental Consultants
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CARLSBAD MUNICIPAL WATER DISTRICT
POINSETTIA PARK SEWER
CMWD Project No. 94-403
LIST OF EXHIBITS
- EXHIBITy
1.1 Proposed Sewer Alignments in Future Developments
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2.1 Alignment Alternative A With Abada
M 2.2 Pipeline Profile of Alignment Alternative A With Abada
r 2.3 Alignment Alternative A Without Abada
2.4 Pipeline Profile of Alignment Alternative A Without Abada
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3.1 Alignment Alternative B With Abada
y 3.2 Pipeline Profile of Alignment Alternative B With Abada
3.3 Alignment Alternative B Without Abada
3.4 Pipeline Profile of Alignment Alternative B Without Abada
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4.1 Alignment Alternative D
4.2 Pipeline Profile of Alignment Alternative D
4.3 Cross Section Through Alignment Alternative D
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1.0 INTRODUCTION
The Carlsbad Municipal Water District is evaluating the backbone sewerage system for
three separate proposed developments south of Palomar Airport Road near Price Club.
The three proposed developments include Mar Vista, Poinsettia Community Park and
Costa Do Sol, as shown on Exhibit 1.1. This exhibit also shows the proposed collection
sewers in each of the developments.
The proposed Mar Vista development on the McReynolds property shows the tentative
sewer alignments within future streets with sewage flowing towards a cul-de-sac on the
northwest side of the property. From the cul-de-sac, the sewer would connect to one of
two existing interceptor sewers which parallels Palomar Airport Road and the Price Club
property. Improvements for this tract have not yet been designed and are therefore,
subject to change.
Improvements for the City of Carlsbad Poinsettia Community Park have been designed
as shown on Exhibit 1.1. The current plan for the sewer system is to gather flows from
a maintenance yard, two restrooms, and possibly from adjacent developments, and direct
flows to a sewer lift station to be located on the west side of the park. The lift station
would pump the flow up a hill to the west and discharge to an existing gravity sewer
located in Paseo Del Norte. The sewer system is currently designed to receive flow from
the Costa Do Sol development to the south and possible from the Mar Vista development
to the north.
The sewer system for the proposed Costa Do Sol development on the Abada property
is planned to take the majority of the flow out of the tract to the south. However, due to
the existing and proposed grades in the development, a low spot will be generated in the
northwest corner of the development. The current plan is to discharge this flow
(generated from approximately 44 single family homes) to the Poinsettia Community Park
sewer system for eventual pumping by the proposed sewer lift station.
Carlsbad Municipal Water District would like to eliminate the need for the sewer lift station
by constructing a gravity sewer line from the Poinsettia Community Park to one of the two
existing interceptor sewers adjacent to Palomar Airport Road. This report evaluates three
alternative alignments (referred to as Alignment Alternative A, B and D, respectively) for
a gravity sewer line in lieu of a sewer lift station and variations on those three alignments.
During the initial discussions of this alignment study, Alignment Alternative C was
eliminated from consideration and is therefore, not addressed in this report.
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D PROPOSED SEWER ALIGNMENTS IN FUTURE DEVELOPMENTS
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EXISTING INTERCEPTOR
SEWERS
BRAMALEA PROPERTY8AMBI PROPERTY
(FUTURE HIDDEN VALLEY ROAD)
LP
MAINT.
YARD
HIDDEN VALLEY ESTATES
ABADA PROPE
FUTURE COSRESTROOM *
LIFT STATION
POSSIBLE SEWER
CONNECTION POINT FOR
FUTURE MAR VISTA
McREYNOLDS PROPERTY
FUTURE MAR VISTA „
CONNECTION TO
EXISTING SEWER
PRICE CLUB
LEGEND
SEWER ALIGNMENT IN PROPOSED DEVELOPMENTS
PAMPAS GRASS
EXHIBIT U
CA1LOTAD MUNICIPAL WATUt D1ST1ICT
FOmSKTTIA PA1K SEW11
DANIEL BOYLK ENGDfKKUNG, INC
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CMWD - Poinsettia Park Sewer Project No. 94-403 - 4/7/95
2.0 ALIGNMENT ALTERATIVE A
2.1 Alignment Alterative A - With Abada
Alignment Alternative A, with contribution of flows from the developed Abada property,
would utilize a portion of the alignment as currently designed for the Poinsettia
Community Park, the street alignment as tentatively planned for Mar Vista, and a
connection to an existing manhole on the 30-inch San Marcos interceptor sewer, as
shown on Exhibit 2.1.
This alignment alternative would begin at the common property line of the Abada/Costa
Do Sol property and Poinsettia Community Park. The required invert elevation at this
point is 123.7-feet above sea level which is the low point in the Abada sewer system.
Between manhole numbers 10 and 13, as shown on Exhibit 2.1, the flow would be
reversed from what is currently planned and shown on Exhibit 1.1. As the sewer line
continues north into the McReynolds/Mar Vista property, future grades force the sewer
flow line to a maximum depth of 38.7-feet below future finished grades with average depth
to the flow line being 34-feet below finished grade of the proposed tract, as shown on the
pipeline profile Exhibit 2.2. As the sewer alignment exits the proposed Mar Vista tract to
the north, the pipeline descends a steep slope and eventually intersects the existing
interceptor sewer at a flow line elevation of 46-feet.
The maximum depth of 38.7-feet to the flow line is over four times deeper than the normal
sewer depth of 9-feet. This, in our opinion, will create future operations and maintenance
problems. Also, some day this sewer pipeline will likely require replacement.
Reconstruction of a sewer pipeline at this depth in a narrow residential street will be a
major disruption to the residents living along the alignment of this sewer pipeline.
Another major concern, and maybe the most important, is the health and safety of District
personnel who will be required to maintain the pipeline. If District personnel are ever
required to enter manholes at this depth, and most likely at some point in time they will,
their health and safety will be compromised.
In addition to the concerns listed above, a 38-foot deep sewer will require special
considerations as to how the homes adjacent to the sewer will connect their laterals to
a pipeline at this depth. Maintenance of laterals is also a factor to be considered. An
alternative would involve a parallel sewer at normal 8 to 9-foot depth and connection of
the parallel sewer to the deep sewer at the north end of the residential development. This
alternative also has its problems such as if and when the 38-foot deep sewer needs to
be repaired or replaced, the parallel sewer and other parallel utilities will most likely need
to be removed and replaced during reconstruction of the deep sewer. This will be a
major expense to the District rate payers.
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CMWD - Poinsettia Park Sewer Project No. 94-403 - 4/7/95
2.2 Alignment Alternative A - Without Abada
Should the Abada property not be developed or not contribute flow to this proposed
gravity sewer, the entire complexion of Alignment Alternative A changes. As shown on
Exhibit 2.3, the amount of sewer line required to be installed is shortened approximately
400-feet by removing flows from the Abada tract. The alignment of the sewer in Poinsettia
Park can be changed as shown without impacting proposed improvements in the Park.
As shown on Exhibit 2.4, eliminating flow from the Abada tract allows the proposed gravity
sewer to be much shallower. The maximum depth from finished surface to the flow line
of the sewer is approximately 17.2-feet from proposed finished surface and occurs in the
Park. The depth of the sewer flow line in the proposed streets of Mar Vista is
approximately 9 to 10-feet, which is slightly deeper than normal sewer depth. This
alternative exits the Mar Vista tract and connects to the existing interceptor sewer to the
north in the same manner as Alignment Alternative A - With Abada.
2.3 Environmental Considerations of Alignment Alternative A
Recon Regional Environmental Consultants evaluated the biological resources within the
alternative sewer alignments including a directed search for the Coastal California
Gnatcatcher within native habitats along the proposed sewer alignments. The potential
for sensitive habitats is primarily in the western portion of the McReynolds property and
north of McReynolds property to Palomar Airport Road and Price Club. Future
development of Poinsettia Community Park will remove any potential for sensitive species
therefore, environmental considerations through the Park were not heavily emphasized
in Recon's work.
In summary, Alignment Alternative A would impact a small area of Coastal Sage Scrub,
which is habitat to the California Gnatcatcher, near the boundary between Poinsettia
Community Park and Mar Vista. The alignment would also disturb Pampas Grass and
a small section of Southern Willow Scrub south of Palomar Airport Road. The Pampas
Grass is considered a "disturbed area" and the Southern Willow Scrub was considered
to have a low to moderate habitat quality. Gnatcatchers were not observed in the Coastal
Sage Scrub traversed by Alignment Alternative A and Recon felt the Coastal Sage Scrub
could be avoided in this area during final design. Overall, Recon estimated Alignment
Alternative A would require mitigation of 0.15 acres. Recon's preliminary report is
included in Appendix A.
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ALIGNMENT ALTERNATIVE A - WITH ABADA
8AMBI PROPERTY
(FUTURE HIDDEN VALLEY ROAD)
BRAMALEA iPROPERTY
EXISTING INTERCEPTOR
SEWERS
CITY OF CARLSBAD
FUTURE POINSETTIA
COMAINT.
YARDHIDDEN VALLEY ESTATES
ABADA PROP ;TY
FUTURE COil
DO SOL
PROPERTYMcREYNOLDS
LEGEND
PRICE CLUB
PROPOSED POINSETTIA PARK SEWER ALIGNMENT ALTERNATIVE
SEWER ALIGNMENT II1 PROPOSED DEVELOPMENTS
PAMPAS GRASS
EJLIUBU 2J
DANHL BOYUE DfGINKDING, INC
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CA1LSBAO MUNICIPAL WATM DIST1ICT
PODrSKTTIA PA1K SlWHt
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PIPELINE PROFILE
PROPERTY FUTURE MAR VISTA DEVELOPMENT
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ALIGNMENT ALTERNATIVE A - WITH ABADA
EXHIBIT 2.2
CAJKLSBAP MUNICIPAL WATD DDTIICTPOUINB111A PAUL DANHL BOYLE BNGINEBB1NG, INC
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ALIGNMENT ALTERNATIVE A - WITHOUT ABADA
I-.400'
EXISTING INTERCEPTOR
SEWERS
SAMBI PROPERTY BRAMALEA PROPERTY
CITY OF CARLSBAD
FUTURE POINSETTIA
COMMUNITY
raEH -
MAINT.
YARDHIDDEN VALLEY ESTATES
ABADA PROPERTY
McREYNOLDS PROPERTY
FUTURE MAR VISTA
PRICE CLUB
LEGEND
PROPOSED POINSETTIA PARK SEWER ALIGNMENT ALTERNATIVE
SEWER ALIGNMENT IN PROPOSED DEVELOPMENTS
PAMPAS GRASS
EXHIBIT 13
CABL0BA9 MUNICIPAL WATE1 MBRICT
FOUfSCTTIA PABE SBWD
DANIBL BOTLK ENGDfKDING, INC
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ALIGNMENT ALTERNATIVE A - WITHOUT ABADA
EXHIBIT 2.4
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CMWD - Poinsettia Park Sewer Project No. 94-403 - 4/7/95
3.0 ALIGNMENT ALTERNATIVE B
3.1 Alignment Alternative B - With Abada
As with Alignment Alternative A, Alignment Alternative B with contribution of flow from the
developed Abada property, would utilize a portion of the sewer alignment as currently
designed for the Poinsettia Community Park, as shown on Exhibit 3.1. instead of
following the future subdivision streets in the Mar Vista development, this alternative would
traverse the back lot lines of the proposed development which is at the top of a steep
slope. Rather than continuing north out of the Mar Vista development as with Alignment
Alternative A, Alignment Alternative B would follow the alignment of an existing dirt road
down the steep slope west of the Mar Vista development, then follow property lines west,
then north to a connection point at an existing manhole on the interceptor sewer adjacent
to Price Club.
The pipeline profile for this alternative is shown on Exhibit 3.2. As can be seen, the
maximum depth of the sewer flow line is 35.8-feet, which occurs within the Mar Vista
development. This alignment through the Mar Vista development will put the pipeline in
or adjacent to the backyards of future homes. This in and of itself creates maintenance
problems and liability issues for the District. Compounded by the extreme depths of the
sewer, this alternative becomes the least desirable of the alternatives discussed.
Replacement of the sewer in the future will be far more difficult and costly than any other
alternatives. Also, health and safety of maintenance personnel, as well as the
homeowners, will be as high or higher than the risks for the other alternatives.
3.2 Alignment Alternative B - Without Abada
Without the contribution of flow from the Abada property, the length of sewer required in
the Park can be reduced and the alignment changed, as shown on Exhibit 3.3. The
depth of the sewer through the Mar Vista development is also reduced as shown on
Exhibit 3.4. The maximum sewer flow line depth is approximately 17.2-feet and occurs
within the Park. Although the pipeline is shallower in Alignment Alternative B without flow
from the Abada property, the maintenance and liability issues associated with a sewer
pipeline in or adjacent to the backyards of homes is not diminished.
3.3 Environmental Considerations of Alignment Alternative B
As shown in Recon's report in Appendix A, Alignment Alternative B traverses a greater
amount of sensitive habitat than Alignment Alternative A. The existing dirt road that runs
west down the slope from the future Mar Vista development has been overgrown with
Coastal Sage Scrub. Coastal Sage Scrub is a potential habitat for the Gnatcatcher
however, Gnatcatchers were not observed along Alignment Alternative B. Once the
pipeline is off the McReynolds property, the alignment traverses Southern Willow Scrub
C15-101-01 -4-
™ CMWD - Poinsettia Park Sewer Project No. 94-403 - 4/7/95
to the connection point of the interceptor sewer adjacent to Price Club. Recon estimates
the total acreage requiring mitigation along Alignment Alternative B is 0.87 acre.
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EXISTING INTERCEPTOR
SEWERS
8AMBI PROPERTY
(FUTURE HIDDEN VALLEY ROAD)
BRAMALEA PROPERTY
CITY OF CARLSBAD
FUTURE POINSETTIA
COMMUNITY PARK i
ffl" "^EH
MAINT.
YARDHIDDEN VALLEY ESTATES
RESTRTJOM
PARKING
LOT
RESTROOM FUTURE COSTA
DO SOLJA
McREYNOLDS PROPERTY
PRICE CLUB
LEGEND
PROPOSED POINSETTIA PARK SEWER ALIGNMENT ALTERNATIVE
SEWER ALIGNMENT IN PROPOSED DEVELOPMENTS
EXHIBIT 3d
CA1LMAP MUNICIPAL WATUt DIST1ICT
FOUIBBll'lA PAIK SIWO
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FINISHED SURFACE
SEWER FLOWLINE
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ALIGNMENT ALTERNATIVE B - WITH ABADA
EXHIBIT
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ABADA PROPERTY
LEGEND
PROPOSED POINSETTIA PARK SEWER ALIGNMENT ALTERNATIVE
SEWER ALIGNMENT IN PROPOSED DEVELOPMENTS
EXHIBIT 3.3
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EXHIBIT 3.4
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4.0 ALIGNMENT ALTERNATIVE D
4.1 Alignment Alternative D
Alignment Alternative D is per the sewer alignment as originally designed in the Park and
parallels the southern and western McReynolds property line. Alignment Alternative D
nearly follows the natural fall of grades between the Park and existing interceptor sewer,
as shown on Exhibit 4.1. The advantage of this alignment is that whether flow is received
from the Abada/Costa Do Sol development or not the sewer pipeline profile does not
change, as shown on Exhibit 4.2. The maximum depth of the sewer flow line is
approximately 20-feet which occurs as the pipeline traverses the valley east to west and
crosses a creek in the middle of the valley floor.
The disadvantage of this alignment is that as the sewer parallels the western McReynolds
property line it is in a 2:1 slope for a portion of this section of the alignment. This would
require construction of a 5-foot high retaining wall approximately 750-feet in length.
Although the cost of constructing a sewer pipeline in this alignment is increased by
constructing a retaining wall for a portion of the alignment, the retaining wall would
provide for a level surface for all weather access. Exhibit 4.3 shows a cross section
through the valley on the McReynolds property.
4.2 Environmental Considerations of Alignment Alternative D
Much of Alignment Alternative D crosses Coastal Sage Scrub and Southern Willow Scrub.
The environmental investigation by Recon found that the Coastal Sage Scrub along
Alignment Alternative D was supporting the Gnatcatcher. Two to three birds were
observed along this alignment on three separate field visits during Recon's study.
Mitigation along Alignment Alternative D is estimated at 0.51 acre. Recon's report states
that the impact along Alignment Alternative D could be minimized by pushing the
north-south section of the alignment through the McReynolds property further east. This
is essentially Alignment Alternative C which was dropped from consideration during the
early discussion stages of this project with the District.
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ALIGNMENT ALTERNATIVE D
r.4001
EXISTING INTERCEPTOR
SEWERS
BRAMALEA PROPERTY3AMBI PROPERTY
(FUTURE HIDDEN VALLEY ROAD)
CITY OF CARLSBAD
FUTURE POINSETMAINT.
YARD COMMUNITY PARK
3LHIDDEN VALLEY ESTATES
ABADA PROPERTY
FUTURE COSTA
DO SOL
-—'MH #8
McREYNOLDS PROPERTY
FUTURE MAR VISTA
LEGEND
PRICE CLUB
PROPOSED POINSETTIA PARK SEWER ALIGNMENT ALTERNATIVE
SEWER ALIGNMENT IN PROPOSED DEVELOPMENTS
EXHIBIT 4.1
CA1L8BAD MUNICIPAL WATH IHCTUCT
C1TIA PABK 8EWK1
DANBL BOTLB tNGIfflDINO, INC
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PRICE CLUB DEVELOPMENT WEST OF
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10*00
CITY OF CARLSBAD
FUTURE POINSETTIA COMMUNITY PARK
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EXHIBIT 4.2
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CROSS SECTION THROUGH ALIGNMENT ALTERNATIVE D
RESIDENTIAL
DEVELOPEMENT
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TO SENSITIVE SPECIES AREA
SENSITIVE SPECIES AREA
CULTIVATED
AGRICULTURAL
FIELDS
PAVED OR DO ALL
WEATHER ROAD FOR
DISTRICT MAINTENANCE
GRAVITY SEWER
ALTERNATIVE D
SECTION A-A
EXHIBIT 43
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CMWD - Poinsettia Park Sewer Project No. 94-403 - 4/7/95
5.0 COST ESTIMATES
Table No. 1 lists the estimated construction costs for each of the alternatives. As shown,
construction costs for Alignment Alternatives A and B are the most expensive while
construction cost for Alignment Alternative D is least expensive, when flows are
contributed by development of the Abada property. When flows are not contributed by
development of the Abada property, Alignment Alternative A is the least expensive and
Alignment Alternative D is the most expensive. It should be noted that lift station costs
to serve Abada if not served by the sewer and environmental mitigation costs are not
included in the construction cost estimates. Inclusion of these costs could have a
significant impact on the total estimated construction cost and ranking for each
alternative.
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C15-101-01 -7-
CMWD - Poinsettia Park Sewer Project No. 94-403 - 4/7/95
PL
Table No. 1
CARLSBAD MUNICIPAL WATER DISTRICT
POINSETTIA PARK SEWER
Construction Cost Estimates
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Alignment Alternative A With Abada
1. Pipeline
2. Manholes
3. Miscellaneous (15%)
Quantity
3,595-Feet
16-Each
L.S.
Total
Cost
$372,375
69,000
66.225
$507.600
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Alignment Alternative A Without Abada
1. Pipeline
2. Manholes
3. Miscellaneous (15%)
3,210-Feet
9-Each
LS.
Total
$240,750
30,000
40.750
$311.500
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Alignment Alternative B With Abada
1. Pipeline
2. Manholes
3. Miscellaneous (15%)
4,085-Feet
16-Each
LS.
Total
$439,156
72,000
76.750
$587.900
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1. Pipeline
2. Manholes
3. Miscellaneous (15%)
Alignment Alternative D
1. Pipeline
2. Manholes
3. Retaining Wall
4. Miscellaneous (15%)
3,380-Feet
10-Each
LS.
Total
2,580-Feet
8-Each
750-Feet
LS.
Total
$253,500
33,000
43.000
$329.500
$259,500
51,000
75,000
58.460
$443.500
C15-101-01 -8-
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6.0 PROJECT MATRIX
A project matrix ranking advantages and disadvantages of each alignment alternative is
presented in Table No. 2. This ranking does not include environmental mitigation and
Abada lift station costs. The result of the ranking in descending order from most
desirable to least desirable is as follows:
Alignment Alternative A Without Abada Most Desirable
Alignment Alternative B Without Abada Next Most Desirable
Alignment Alternative D Next Most Desirable
Alignment Alternative A With Abada Next Most Desirable
Alignment Alternative B With Abada Least Desirable
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Table No. 2
CARLSBAD MUNICIPAL WATER DISTRICT
POINSETTIA PARK SEWER
Preliminary Project Matrix1.ID
CONSIDERATION
1 . Operations & Maintenance
2. Future Replacement
3. Worker Safety
4. Manhole Access
5. Repairs
6. Environmental Issues
7. Construction Cost
8. Easement Acquisition
9. Resource Agency Approval
TOTAL
AH. A
With
Abada
2
2
2
2
2
4
1
4
4
23
Alt. A
Without
Abada
5
5
5
5
5
5
5
5
5
45
Alt. B
With
Abada
1
1
2
2
2
2
2
2
2
16
Alt. B
Without
Abada
3
3
4
3
3
3
4
3
3
29
Alt. D
4
4
4
4
4
1
3
1
1
26
(1)RATING POINTS (1 TO 5)
1 = Least Desirable
5 = Most Desirable
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7.0 CONCLUSIONS AND RECOMMENDATIONS
7.1 Conclusions
Clearly, Alignment Alternative A without Abada is the preferred alternative from an
engineering standpoint, a construction cost standpoint and an environmental standpoint.
However, development of the Abada property as it is currently envisioned would require
construction of a lift station.
When flow is contributed to the system by the Costa Do Sol development on the Abada
property, the preferred alternative is not so clear. From an engineering and construction
cost standpoint, Alignment Alternative D is preferable however, from an environmental
standpoint Alignment Alternative D is least desirable. If the costs of mitigation are
included in the project costs, Alignment Alternative D may no longer be preferred due to
the total project cost. Due to the environmental concerns and potential mitigations,
Alignment Alternative A may become preferred over Alignment Alternative D. If
development on the Abada property is going to contribute flow to this sewer system, the
disadvantages of constructing a sewer lift station versus the disadvantages of Alignment
Alternatives A and D need to be revisited.
7.2 Recommendations
Comments regarding the alignment alternatives have not yet been received from the
resource agencies. Recommendations will be included in the report after the resource
agencies have had an opportunity to offer input to the project.
C15-101-01 -11-
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APPENDIX A
• POINSETTIA PARK SEWER
_ BIOLOGICAL TECHNICAL REPORT
By Recon Regional Environmental Consultants
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POINSETTIA PARK SEWER
Biological Technical Report
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BIOLOGICAL RESOURCE REPORT
FOR
POINSETTIA PARK SEWER
I CARLSBAD MUNICIPAL WATER DISTRICT
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• Prepared for
- DANIEL BOYLE ENGINEERING, INC.
| 23231 SOUTH POINTE DRIVE, SUITE 103
LAGUNA HILLS, CA 92653
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Regional Environmental Consultants
7460 Minion Valtoy Ro»d, San Diego, CA 92108 (619) 542-1611
RECON NUMBER 2690B
MARCH 21,1995
This document printed on recycled paper.
TABLE OF CONTENTScIntroduction 1
I Methods 1
• Existing Conditions 1
A. Botany 5
| B. Zoology 7
C. Sensitive Resources 7
Impact Analysis 9
I A. Habitat 11
B. Sensitive Species 11
jy C. Jurisdictional Waters and Wetlands 11
• D. Steep Slopes 11
Recommendations 12
I, A. Avoidance and Minimization 12
_ B. Mitigation 12Bi
References 13
FIGURES
H 1: Project location in San Diego County 2
™ 2: Project location in city of Carlsbad 3
3: Existing vegetation and locations of sensitive resources and alternative
H sewer alignments 4
TABLE
I 1: Summary of Impacts 10
• ATTACHMENTS
1: Plant species observed
p 2: Wildlife species observed
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Introduction
The Carlsbad Municipal Water District plans to construct a sewer pipeline that would
extend from Palomar Airport Road near Price Club southerly to the proposed Poinsettia
Community Park (Figures 1 and 2). The purpose of the project is to provide sewer
service to the proposed park and adjacent land owners and eliminate other costly
alternatives (i.e., sewage lift station). This report describes the biological resources
present along three alternative pipeline alignments, presents the results of an impact
analysis of the project on biological resources, and provides recommendations for
avoiding, minimizing, and mitigating potential significant impacts to biological
resources.
Methods
A general botanical survey was conducted along the alternative sewer alignments and the
surrounding area on February 10,1995. Vegetation communities were mapped and a list
of plant species observed was compiled. Since the survey was conducted in late winter,
annual plants that bloom during the spring and summer months may not have been
detected. A general wildlife survey was conducted on February 3, 1995, in conjunction
with directed surveys discussed below.
Directed surveys were conducted for coastal California gnatcatchers on February 3, 10,
and 17, 1995, in accordance with the terms and conditions of RECON's
endangered/threatened species permit (#PRT-797665). Surveys covered all areas of
appropriate (even marginally/questionably appropriate) habitat on-site. Tape recordings
of gnatcatcher vocalizations were played to elicit calling responses. These taped
vocalizations were played approximately every five minutes, or at the surveyor's
discretion when a reasonable distance had been covered since the last playing of the tape.
Weather conditions during the surveys ranged between 59° Fahrenheit (F) and 74° F,
with winds between 0 and 5 miles per hour, and up to 80 percent cloud cover. All
surveys were conducted between 7:00 and 11:30 A.M. During the directed gnatcatcher
surveys, notes were taken on other species observed or detected.I
1 Existing Conditions
I The following sections describe the plants, animals, and sensitive resources observed in
B the study area. Vegetation, sensitive species sightings, and the three alternative sewer
_ alignments surveyed are shown on Figure 3.
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OCEANSIDE
BUENA VISTA LAGOON
AGUAHEDIONDA
LAGOONCARLSBAD
PROJECT LOCATION
• f LAKE SAN MARCO!
LEUCADIA
ENCINITAS
2 MILES 0
FIGURE
Regional Location of the Project
RECQN
(FUTURE HIDDEN VALLEY ROAD)
CITY OF CARLSBAD
FUTURE POINSETTIA
COMMUNITY PARK
500 FEET 0
FIGURE 2
Project Site
Baccharis scrub
Southern willow scrub
Southern mixed chaparral
Chamise chaparral
Coastal sage scrub
Pampas grass
Disturbed/agriculture
C - Ceanothus verrucosus
-D Dichondra occidentalis
^— Sewer alignment
500 250 FEET 0
FIGURE 3
Existing Vegetation,
Sensitive Resources
and Sewer Alignments (A,B> and D)
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A. Botany
Four native plant communities and three disturbance communities occur in the study
area. The locations of the communities described below are shown on Figure 3. A
complete list of plant species observed on the site is given in Attachment 1.
1. Diegan Coastal Sage Scrub
Coastal sage scrub habitat in this area is dominated by California sagebrush (Artemisia
californicd), black sage (Salvia mellifera), California buckwheat (Eriogonum
fasciculatum), laurel sumac (Malosma laurina), and lemonadeberry (Rhus integrifolia).
The plant community occurs on the east-facing slope of the southern end of the main
canyon on the site, and along the east- and west-facing slopes towards the northern end
of the canyon (see Figure 3). Pampas grass (Cortederia selloand) occurs in the coastal
sage scrub habitat on the west-facing slope at the northern end of the canyon. Habitat
quality of the coastal sage scrub habitat on the site is, in general, moderate to high.
Alignment A crosses a small portion of coastal sage scrub habitat; Alignment B crosses
coastal sage scrub habitat, especially as it descends down to the canyon bottom on the
north end; and Alignment D crosses coastal sage scrub habitat along the entire length of
the east-facing slope below the condominiums.
2. Southern Willow Scrub
Dominated by red willow (Salix laevigatd) and mule fat (Baccharis salicifolid), this plant
community is confined to scattered locations on the drainage bottom of the north-south
canyon and as a large woodland at the mouth of the canyon and in Encinas Creek (see
Figure 3). Other plants found in this habitat type on the site include curly dock (Rumex
crispus), cocklebur (Xanthium strumariwri), poison hemlock (Conium maculatum), and
pampas grass, especially in the understory of the woodland area. The habitat quality of
the willow scrub areas of the property are low to moderate due to small habitat patch size
in the canyon and invasion of pampas grass in the understory of the woodland area.
Alignment A crosses a small area of this habitat just south of Palomar Airport Road;
Alignment B crosses through the large willow woodland stand at the north end of the
canyon; and Alignment D also crosses through the willow woodland at the north end of
the canyon, but west of Alignment B.
3. Southern Mixed Chaparral
This habitat occurs on the north-facing slope east of the mouth of the small canyon (see
Figure 3). The area burned in the recent past, and the area is recovering from the
disturbance. Dominant plant species observed include lemonadeberry, laurel sumac,
black sage, bush monkeyflower (Mimulus aurantiacus), and blue elderberry (Sambucus
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mexicana). Habitat quality of this community is low to moderate due to the past fire,
invasion of pampas grass, and use of the area by migrant workers. Alignment A crosses
through disturbed southern mixed chaparral as it descends down the north-facing slope
above Encinas Creek. This area of the mixed chaparral is heavily infested with pampas
grass.
4. Chamise Chaparral
A small patch of chamise chaparral is found on the west-facing slope near the central part
of the canyon (see Figure 3). This area is dominated by a nearly pure stand of chamise
(Adenostoma fasciculatum). Habitat quality is moderate due to small patch size and
disturbance from migrant workers. None of the proposed sewer alignments cross this
habitat type.
5. Disturbed Areas
Three community types are classified under disturbed for this report: agricultural lands,
baccharis scrub, and pampas grass. The agricultural fields on the site were producing
tomatoes. Fields that have been fallow towards the south portion of the study area and
east of the canyon were vegetated with primarily non-native species. The non-native
plants include black mustard (Brassica nigrd), tocolote (Centaurea melitensis), foxtail
chess (Bromus madritensis ssp. rubens), smooth brome (Bromus hordaceus), and radish
(Raphanus sativus). Habitat values of these area is considered low for native wildlife
and plants. The majority of Alignments A and B cross active and fallow agricultural
fields. The southern third of Alignment D crosses fallow agricultural fields.
Baccharis scrub habitat occurs in the flat portions of the canyon adjacent to the drainage
course. This plant community is dominated by coyote bush (Baccharis pilularis) with
other co-dominant species such as blue elderberry, sweet fennel (Foeniculum vulgare),
and coast goldenbush (Isocoma menziesii). Habitat quality of this community is
moderate because of the dense shrub cover. Alignment D crosses through this habitat as
it traverses the small canyon.
Pampas grass has invaded the slopes and canyon bottom of Encinas Creek at the north
end of the project area, south of Palomar Airport Road (see Figure 3). Dense stands of
this species with sea fig (Carpobrotus edulis) cover a large area to the exclusion of most
other species. Habitat quality of this community is generally considered low. Alignment
A crosses through a dense stand of pampas grass south of Palomar Airport Road before
traversing Encinas Creek.
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B. Zoology
A total of 22 bird species, 7 mammal species, and 1 amphibian species were observed or
detected on the property. Typical wildlife species encountered or detected during the
surveys include yellow-rumped warbler (Dendroica coronatd), wrentit (Chamaea
fasciatd), California and rufous-sided towhee (Pipilo crissalis and P. erythropthalmus,
respectively), scrub jay (Aphelocoma coerulescens), song sparrow (Melospiza melodia),
house finch (Carpodacus mexicanus), coyote (Canis latrans), and racoon (Procyon
lotor). A complete list of wildlife species observed is provided in Attachment 2.
C. Sensitive Resources
For purposes of this report, species will be considered to be sensitive if they are (1) listed
by state or federal agencies as threatened or endangered or are candidates or proposed for
such listing; (2) on Lists IB or 2 of the California Native Plant Society's (CNPS)
Inventory of Rare and Endangered Vascular Plants of California (Skinner and Pavlik
1994); or (3) considered rare, endangered, or threatened by the Natural Diversity Data
Base (NDDB) (State of California 1994) or local conservation organizations or
specialists. Noteworthy plant species are considered to be those which are on Lists 3 and
4 of the CNPS Inventory. Sensitive habitat types are those identified by the California
NDDB (Holland 1986). Assessments for the potential occurrence of sensitive or
noteworthy species are based upon known ranges and habitat preferences for the species
and species occurrence records from the NDDB. Locations of sensitive biological
resources are noted on Figure 3.
1. Wildlife
Sensitive wildlife species observed on-site were coastal California gnatcatcher
(Polioptila califomica californica) and black-shouldered kite (Elanus caeruleus).
Woodrat (Neotoma sp.) middens were detected on-site. It is very possible that these
middens belong to the San Diego desert woodrat (Neotoma lepida intermedia), which is a
federal Category 2 candidate species. Without a small mammal trapping effort the
species cannot be determined. During a previous (1994) survey which partially covered
the current survey area, a Cooper's hawk (Accipter cooperi) was flushed from a roost on
the slope below the condominiums. Other sensitive species with a high likelihood to
occur in natural habitats on-site include the silvery legless lizard (Anniella pulchra
pulchra) and orange-throated whiptail (Cnemidophorus hyperythrus beldingi).
The willow riparian area at the north end of the property was evaluated for least Bell's
vireo (Vireo bellii pusillus) in 1994. The habitat is considered to have a low to moderate
likelihood for least Bell's vireo presence. The federal and state listed southwestern
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willow flycatcher (Empidonax traillii extimus) is considered to have a low likelihood of
occurrence in the willow riparian area.
Coastal California Gnatcatcher
This species was detected on-site during each of the three directed surveys. During the
February 3 survey, two to three gnatcatchers were observed on the coastal sage scrub-
covered slope leading up to Paseo del Norte. It was not clear whether the two
southernmost observations were of the same animal; hence, the uncertainty as to whether
two or three birds were observed. The behavior of the northernmost of the three
gnatcatchers was very aggressive, suggesting it was a male defending a territory.
The second survey (February 10), revealed two gnatcatchers, both of which were being
shy and quiet They were observed only for a moment (despite patient efforts to catch
further sight of them), and so sex could not be determined. They were located on the
coastal sage scrub-covered slope just east (downhill) from the trailer storage lot along
Paseo del Norte.
The third (February 17) survey again noted two gnatcatchers on the same slope as the
preceding two weeks. One of these was heard calling from the general vicinity of a patch
of willows within the channel bottom. Again, the gnatcatchers were very quiet and hard
to observe, responding only briefly and irregularly to taped vocalizations.
All of the above observations of the coastal California gnatcatcher occurred within the
proposed Alignment D, approximately near the middle where it crosses the small canyon.
The coastal sage scrub habitat crossed by Alignments A and B has the potential to
support coastal California gnatcatcher.
2. Plants
Three sensitive plant species were observed during the surveys: wart-stemmed ceanothus
(Ceanothus verrucosus), ashy spike-moss (Selaginella cinerascens), and western
dichondra (Dichondra occidentalis). The wart-stemmed ceanothus, also known as white
coast ceanothus, is a federal Category 2 candidate species. The other two plant species
are on the California Native Plant Society's List 4, a watch list of plants of limited
distribution. Locations of the white coast ceanothus and western dichondra are shown on
Figure 3; the ashy spike-moss occurs on the soil surface between shrubs throughout the
area mapped as southern mixed chaparral. Appropriate habitat also occurs within the
coastal sage scrub and chaparral on-site for Harpagonella palmeri, but this species was
not observed. No sensitive plant species were observed within the proposed alternative
sewer alignments.
3. Habitats
***
The Diegan coastal sage scrub found in the vicinity of the proposed alternative sewer
alignments is considered sensitive by the resources agencies due to its cumulative loss of
*"* acreage in southern California over the last two decades and the fact that this community
— type often supports sensitive plant and animal species. Coastal California gnatcatchers
m occur in the coastal sage scrub habitat on the east- and west-facing slopes of the north-
south canyon (see Figure 3). It is assumed that at least one pair of gnatcatchers lives in
*"• the canyon, but as many as two pairs may exist in this area. Any action which would
«* impact this bird species or its habitat would require consultation with the U.S. Fish and
Wildlife Service (USFWS) through either Section 7 or Section lOa of the federal
Endangered Species Act
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p« Riparian and wetland areas are considered sensitive due to the cumulative losses of these
to habitat types statewide. Section 404 of the Clean Water Act regulates the deposition of
fill material being placed in "waters of the U.S." and adjacent wetlands, and these
f» regulations are under the jurisdiction of the U.S. Army Corps of Engineers (USAGE).
i"* The USAGE issues permits that enable projects to impact wetlands provided every effort
has been made to avoid the impacts and to develop mitigation so that there is a no net
F loss of wetland acreage or values. Wetland areas of this project are primarily associated
with the distribution of southern willow scrub. Unvegetated portions of the main
C drainage course of the canyon are considered non-wetland jurisdictional waters due to the
presence of a definitive ordinary high water mark.
f The California Department of Fish and Game (CDFG) also has jurisdiction over
^* streambeds and issues streambed alteration agreements under Sections 1600-1603 of the
Fish and Game Code. CDFG also has a policy of no net loss of wetlands.c
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4. Other Sensitive Areas
Steep slopes within the coastal zone which support native vegetation are typically off-
limits to development. Exemptions may exist in local coastal zone plans that would
permit sewer lines to cross these areas provided measures are taken to offset the impacts
to the native habitat Both the coastal sage scrub and southern mixed chaparral on the
steep slopes in the vicinity of the project would be included in this category. Alignments
A and B would involve traversing steep slopes.E
r_ Impact Analysis
The following section describes the potential impacts to biological resources for each of
the three proposed sewer alignments. A summary of the impacts is given in Table 1.
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TABLE 1
SUMMARY OF IMPACTS
(acres)
Habitat Type Alignment A Alignment B Alignment D
Coastal sage scrub 0.01 0.35 0.46
Southern willow scrub 0.05 0.29 0.17
Baccharis scrub 0.36
Pampas grass 0.37 0.19 0.22
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A. Habitat
Alignment A would impact 0.01 acre of coastal sage scrub, 0.37 acre of pampas grass,
and 0.05 acre of southern willow scrub with the remainder of the alignment crossing
disturbed areas (e.g., agriculture fields). Alignment B would impact 0.35 acre of coastal
sage scrub, 0.29 acre of southern willow scrub, and 0.19 acre of pampas grass with the
remainder of the alignment crossing disturbed areas (e.g., agriculture fields). Alignment
D would impact 0.46 acre of coastal sage scrub, 0.36 acre of baccharis scrub, 0.17 acre of
southern willow scrub, and 0.22 acre of pampas grass with the remainder of the
alignment crossing disturbed areas (e.g., abandoned agricultural fields).
B. Sensitive Species
All three alignments would have direct impacts on the coastal California gnatcatcher
through the loss of coastal sage scrub habitat Potential impacts to coastal sage scrub
habitat on Alignment A could be avoided. Losses of coastal sage scrub habitat could also
have direct impacts on potentially occurring species such as San Diego desert woodrat,
silvery legless lizard, and orange-throated whiptail.
No sensitive plant species that occur on the site would be impacted by the proposed
sewer alignments.
C. Jurisdictional Waters and Wetlands
All of the proposed sewer alignments would cross Encinas Creek. The willow woodland
habitat growing along the creek is a wetland based on the presence of hydrophytic
vegetation, hydric soils, and the proper hydrology. In addition, Alignment D crosses the
drainage in the small north-south canyon. These areas fall under the jurisdiction of both
the USAGE and CDFG. Alignment A would impact 0.05 acre of wetland, Alignment B
would impact 0.29 acre of wetland, and Alignment D would impact 0.17 acre of wetland.
D. Steep Slopes
Both Alignments A and B would traverse steep slopes vegetated with native plant species
within the coastal zone. Alignment A would temporarily impact 0.17 acre of steep slope
and Alignment B would temporarily impact 0.34 acre of steep slope.
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The suggestions below are designed to avoid and/or minimize potential impacts to
biological resources. Mitigation measures are given for unavoidable impacts to
biological resources.
A. Avoidance and Minimization
Adjustment to the proposed sewer alignments would help avoid and/or minimize impacts
to sensitive biological resources. The central sections of Alignments A and B could be
adjusted to avoid impacts to coastal sage scrub near the north boundary of Poinsettia
Park. Impacts to willow woodland and wetlands along Alignment B could be minimized
by rerouting the alignment around the base of the hill to the northeast across disturbed
areas and then north across the pampas grass area, similar to Alignment A in this
location. Impacts to both coastal sage scrub and wetlands could be minimized along
Alignment D north of Poinsettia Park by moving the entire segment of the alignment to
the east side of the drainage, out of coastal sage scrub habitat and into baccharis scrub
habitat In addition, further impacts to coastal sage scrub can be avoided by moving the
east-west segment of the central portion of the alignment south out of the coastal sage
scrub habitat Provided that these realignments are made, impacts to willow woodland
and wetlands could be further minimized along Alignment D by routing the pipeline
around the woodland as suggested for Alignment B above.
B. Mitigation
Unavoidable impacts to sensitive biological resources will require mitigation. Therefore,
any residual impacts to southern willow scrub and coastal sage scrub must be
compensated for to reduce the impacts below a level of significance. Impacts to southern
willow scrub (includes wetlands) are typically mitigated by the creation and restoration
of similar habitat, usually at a ratio of 3:1 (three acres created for each acre impacted).
This type of compensation will satisfy the regulatory requirements of the USAGE (404
permit) and CDFG (1603 streambed alteration agreement) likely to be applicable to this
project Thus, based on the impact analysis presented in Table 1, the mitigation acreage
needed for southern willow scrub habitat would be:
Alignment A 0.15 acre
Alignment B 0.87 acre
Alignment C 0.51 acre
Suitable sites for the southern willow scrub restoration exist in the small tributary canyon
and along Encinas Creek to the north. Although reviewed on a case-by-case basis by the
12
resource agencies, it is sometimes possible to receive partial mitigation credit for the
** enhancement of riparian habitat through the removal of non-native species, such as
P- pampas grass, as long as there is a no net loss of wetland. Whether habitat is created and
y restored or enhanced, a mitigation plan will need to be prepared that addresses the site
preparation, plant installation, maintenance, and monitoring of the mitigation effort
f
•* Options for the mitigation of unavoidable impacts to coastal sage scrub habitat involve
the restoration of coastal sage scrub habitat at a ratio of at least 2:1 or through the federal
F 4d rule process being implemented for this habitat type with respect to the coastal
California gnatcatcher. Under the habitat restoration option, a suitable mitigation site
E would need to be identified and then restored by planting native coastal sage scrub
species. This option would require a mitigation plan to be prepared, as described above.
Under the 4d rule option, the City of Carlsbad must submit the proper findings to the
P USFWS that allows them to credit the incidental take to their approved coastal sage scrub
• take allowance. The 4d rule findings would contain the mitigation requirements of the
project which typically involve either conservation of unprotected coastal sage scrub
L habitat off-site or habitat restoration. Regardless of which mitigation option is chosen,
final approval of the mitigation must come from the USFWS in order to comply with the
C federal Endangered Species Act. Consultation with the USFWS may be initiated under
Section 7 (if coupled with the 404 permit), under Section lOa, or through the 4d rule
process. .
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References
California, State of
1994 Natural Diversity Data Base. Natural Heritage Division, Department of Fish
and Game. Data base search current through January 1994.
Holland, Robert F.
1986 Preliminary Descriptions of the Terrestrial Natural Communities of California.
Nongame-Heritage Program, California Department of Fish and Game.
October.
Skinner, Mark, and Bruce Pavlik
1994 Inventory of Rare and Endangered Plants of California. California Native
Plant Society Special Publication No. 1,5th ed. Sacramento. In press.
13
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ATTACHMENT 1
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ATTACHMENT 1
PLANT SPECIES OBSERVED
Scientific Name Common Name Origin
Acacia sp.
Adenostomafasciculatum Hook. & Arn.
Ambrosia psilostachya DC.
Artemisia californica Less.
Arundo donax L.
Atriplex semibaccata R.Br.
Avena barbata Link
Baccharis pilularis DC.
Baccharis salicifolia (Ruiz Lopez & Pav(5n) Pers.
Brassica sp.
Bromus diandrus Roth.
Carpobrotus edulis (L.) Bolus.
Ceanothus verrucosus Nutt.
Centaurea melitensis L.
Chenopodium ambrosioides L.
Conium maculatum L.
Conyza canadensis (L.) Cronq.
Cortaderia selloana (Schultes) Asch. & Graebner
Dichelostemma capitatum Alph. Wood
Dichondra occidentalis House
Encelia californica Nutt.
Eriodictyon crassifolium Benth.
Eriogonumfasciculatum Benth. vai.fasciculatum
Erodium cicutarium (L.) L. Her.
Eucalyptus spp.
Focniculum vulgare Mill.
Gnaphalium canescens DC. ssp. beneolens (Davidson) Stebb. & Keil.
Hemizoniafasciculata (DC.) Torrey & A. Gray
Heteromeles arbutifolia (Lindley) Roemer
Heterotheca grandiflora Nutt.
Isocoma menziesii (Hook. & Arn.) G. Nesom var. menziesii
Isomeris arborea Nutt.
Lactuca serriola L.
Leymus condensatus (C. Presl) A. Love
Limonium perezii (Stapf) Hubb.
Lofttf scoparius (Nutt in Torrey & A. Gray) Ottley var. scoparius
Acacia
Chamise
Western ragweed
California sagebrush
Giant reed
Australian saltbush
Slender wild oat
Coyote bush
Mule fat, seep-willow
Mustard
Ripgut grass
Hottentot fig
Wart-stemmed ceanothus
Tocolote, star-thistle
Mexican tea
Poison hemlock
Horseweed
Selloa pampas grass
Blue dicks
Western dichondra
Common encelia
Felt-leaved yerba santa
California buckwheat
White-stemmed filaree
Eucalyptus
Fennel
Fragrant everlasting
Golden tarplant
Toyon, Christmas berry
Telegraph weed
Coast goldenbush
Bladderpod
Prickly lettuce
Giant ryegrass
Perez rosemary
California broom
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N
N
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N
N
N
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N
N
N
N
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N
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ATTACHMENT 1
PLANT SPECffiS OBSERVED
(continued)
Scientific Name Common Name Origin
Lupinus bicolor Lindl.
Malacot hamnus fasciculatus (Torrey & A. Gray) E. Greene
Malosma laurina (Nutt.) Abrams
Malva parviflora L.
Marah macrocarpus (E. Greene) E. Greene
Mimulus aurantiacus Curtis
Myoporum laetum Forst.
Nassella pulchra (A. Hitchc.) Barkworth
Nerium oleander L.
Nicotiana glauca Grab.
Opuntiaficus-indica (L.) Miller
Opuntia littoralis (Engelm.) Cockerel!.
Oxalis pes-caprae L.
Poa annua L.
Raphanus sativus L.
/?/»w integrifolia (Nutt.) Brewer & Watson
Ricinus communis L.
Rumex crispus L.
Salix laevigata Bebb
Salsola tragus L.
Salvia mellifera E. Greene
Sambucus mexicana C. Presl
Sonchus oleraceus L.
Tamarix sp.
Xanthium strumarium
Xylococcus bicolor Nutt.
schidigera K.E. Ortgies
Miniature lupine
Chaparral mallow
Laurel sumac
Cheeseweed, little mallow
Wild cucumber
Bush monkeyflower
Myoporum
Purple needlegrass
Oleander
Tree tobacco
Indian fig
Shore cactus
Bermuda buttercup
Annual bluegrass
Radish
Lemonadeberry
Castor bean
Curly dock
Red willow
Russian thistle, tumbleweed
Black sage
Blue elderberry
Common sow thistle
Tamarisk
Dwarf nettle
Cocklebur
Mission manzanita
Mohave yucca
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N
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N
N
N
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N
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N
N
N
OTHER TERMS
N = Native to locality
I = Introduced species from outside locality
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ATTACHMENT 2
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ATTACHMENT 2
WILDLIFE SPECIES OBSERVED/DETECTED ON THE POINSETTIA PARK SEWER SITE
Common Name Scientific Name Occupied Habitat Status
Evidence of
Occurrence
Amphibians
California toad
Birds
Black-shouldered kite
Northern harrier
Red-shouldered hawk
Red-tailed hawk
California quail
Mourning dove
Greater roadrunner
Anna's hummingbird
Black pboebe
Scrub jay
Common raven
Bushtit
Bewick's wren
Northern mockingbird
Wrentit
Coastal California gnatcatcher
House finch
Yellow-rumped warbler
Rufous-sided towhee
California towbee
Song sparrow
Western meadowlark
Red-winged blackbird
Bufo boreas halophilus
Elanus caeruleus
Circus cyaneus hudsonius
Buteo lineatus elegans
Buteo jamaicensis
Callipepla californica californica
Zenaida macroura marginella
Geococcyx californianus
Calypte anna
Sayomis nigricans semiatra
Aphelocoma coerulescens obscura
Corvus corax clarionensis
Psaltriparus minimus minimus
Thyromanes bewickii
Afimus polyglottos polyglottos
Chamaea fasciata henshawi
Polioptila californica californica
Carpodacus mexicanus frontalis
Dendroica coronata
Pipilo erythropthalmus megalonyx
Pipilo crissalis
Melospiza melodia
Sturnella neglecta
Agelaius phoeniceus
O
CFP.SDC,*
CSC.SDC
CMC
CSS.O.F
SWS
CSS
SWS
CMC.CSS
F
CSS
CSS
All
CSS
CSS
CSS,CMC,Ag
CSS
CMC
CSS
CSS
G,Ag
SWS
SDC
FT,CSC,SDC
O
O
V,0
O.V
O
O
0,V
O
O
O
V.O
Ov,o
Oo,v
O
O
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v,o
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O
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ATTACHMENT 2
WILDLIFE SPECIES OBSERVED/DETECTED ON THE POINSETTIA PARK SEWER SITE
(continued)
Common Name Scientific Name Occupied Habitat Status
Evidence of
Occurrence
Mammals
Opossum
Raccoon
Coyote
California ground squirrel
Woodrat
Introduced Species
Domestic cat
Domestic dog
Didelphis virginiana
Procyon lotor
Canis latrans
Spermophilus beecheyi
Neotoma spp.
Felis domesticus
Canis familiaris
SWS
SWS
CSS
CSS
SWS
SWS
All
T
T
T,S
0,T
D
T
T
Habitats
Ag
CMC
CSS
F
G
O
SWS
SM
Agriculture
Coastal mixed chaparral, mixed chaparral, chamise chaparral
Coastal sage scrub, inland sage scrub
Flying overhead
Grassland, pasturelands, etc.
Open places, waste places, roadsides, burns, etc.
Southern willow scrub
Saltwater marsh
Status
CFP
CSC
FT
SDC
Evidence of Occurrence
V = Vocalization
O = Observed
T = Track
S = Scat
D = Den site
C = Carcass/remains
California fully protected species
California Department of Fish and Game species of special concern
Listed as threatened by the federal government
City of San Diego Resource Protection Ordinance "Sensitive Species"
Taxa listed with an asterisk fall into one or more of the following categories:
• Taxa considered endangered or rare under Section 15380(d) of CEQA guidelines
• Taxa that are biologically rare, very restricted in distribution, or declining
throughout their range
• Population(s) in California that may be peripheral to the major portion of a
taxon's range, but which are threatened with extirpation within California
• Taxa closely associated with a habitat that is declining in California at an
alarming rate (e.g., wetlands, riparian, old growth forests, desert aquatic systems,
native grasslands)