HomeMy WebLinkAbout3338B; AGUA HEDIONDA & CALAVERA CREEK DREDGING; BIOLOGICAL RESOURCES & TECHNICAL DATA; 2007-02-01APPENDIX D
BIOLOGICAL RESOURCES DATA
AND TECHNICAL REPORTS
AGUA HEDIONDA AND CALAVERA CREEKS
JURISDICTIONAL DELINEATION REPORT FOR
WATERS OF THE U.S. AND STATE OF CALIFORNIA
AGUA HEDIONDA AND CALAVERA CREEKS
JURISDICTIONAL DELINEATION REPORT FOR
WATERS OF THE U.S. AND STATE OF CALIFORNIA
Preparedfor:
City of Carlsbad
Department of Public Works-Engineering
1635 Faraday Avenue
Carlsbad, CA 9200877314
Contact: David Hauser
Prepared by:
EDAW, Inc.
1420 Kettner Boulevard, Suite 620
San Diego, CA 92101
Contact: Joshua Zinn
February 2007
TABLE OF CONTENTS
Section . . Page
INTRODUCTION ................................................................................................................ 1
Jurisdictional Unvegetated (Nonwetland) Waters of the U.S .......................................... .... 1
Jurisdictional Waters of the State ........................................................................................4
METHODS..........................................................................................................................5
RESULTS .............................................................................................................................. 6
AguaHedionda Creek.........................................................................................................6
CalaveraCreek ..................................................................................................................... 6
Waters...................................................................................................................... 8
Wetlands.................................................................................................................8
LITERATURE CITED .......................................................... . ............................................ 11
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LIST OF FIGURES
Figure Page
1 Regional Location Map........................................................................................................2
2 Jurisdictional Reaches ............................................................................................................ 7
3 Agua Hedionda Creek at the confluence with Calavera Creek. Looking
upgradient (east) from the El Camino Real Bridge .............................................................9
4 Calavera Creek ...................................................................................................................... 9
5 Agua Hedionda Creek at El Camino Real Bridge looking downstream (west) to
theCannon Road Bridge .................................................................................................... 10
6 Calavera Creek...................................................................................................................11
LIST OF TABLES
Table Page
1 USACE and CDEG Jurisdictional Area within Project Area .......... .................................... 8
Page ii Agua Hedionda and Calavera Creeks JurisdictionalDelineation Report
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I. INTRODUCTION
On January 28, 2007, EDAW, Inc. (EDAW) performed a reconnaissance level jurisdictional
delineation for Agua Hedionda and Calavera creeks in the City of Carlsbad (Figure 1). The
purpose of this delineation was to facilitate the proper classification of jurisdictional features
within the project area.
A reconnaissance level delineation is defined here as the identification of area(s) that meet the
jurisdictional requirements under Section 404 of the Clean Water Act (Section 404), which is
done at a local scale and covers regulated water bodies (including aquatic resources regulated
under the California Department of Fish and Game Code [CFGC] Section 1600). The sampling
protocols outlined in the Corps of Engineers Wetlands Delineation Manual (Environmental
Laboratory 1987) and 33 CFR 328 were not applied or modified for use at the reconnaissance
level due to absence of hydrophytic vegetation.
Calavera Creek encompasses 0.17 acre of jurisdictional "waters of the U.S." and "waters of the
State" and 0.07 acre of waters of the State. The 0.24 acre of total jurisdictional waters is
composed of 0.17 acre of unvegetated waters, 0.07 acre of ornamental/disturbed riparian forest,
and no jurisdictional wetlands. Agua Hedionda Creek consists of 3.73 acres of jurisdictional
waters of the U.S. and State and 1.44 acres of waters of the State. Of the 5.17 acres of total
jurisdictional waters, 3.18 acres is unvegetated waters, 0.55 acre is jurisdictional wetland in the
form of riparian scrub/forest, 0.01 is riparian scrub/forest, and 1.43 acres is ornamental/disturbed
riparian forest. Unvegetated waters of the U.S. were mapped in keeping with U.S. Army Corps
of Engineers (USACE) policy. The lateral limit of USACE jurisdiction for nontidal watercourses
(without adjacent wetland areas) is defined below.
Jurisdictional Unvegetated (Nonwetland) Waters of the U.S.
The USACE defines wetlands as:
"Those areas that are inundated or saturated by surface or ground water at a
frequency and duration sufficient to support, and that under normal circumstances
do support, a prevalence of vegetation typically adapted for life in saturated soil
conditions. Wetlands generally include swamps, marshes, bogs, and similar
areas" (33 CFR 328.3[b]; 40 CFR 230.3[t]).
Agua Hedionda and Calavera Creeks Jurisdictional Delineation Report Page 1
01_04080135 agna hedionda calaveraiDR - Appendix D.doc 4/26/2007
RIVERSIDE COUNTY
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Page 2 A,ea Hedionda and Calavera Creeks Jurisdictional Delineation Report
PJ2005/C5080103/tlpllicl/Figures/FiglRmap_iurhDelin ii 01/25/07
A wetland delineation (unlike a jurisdictional delineation) is based on the presence of
hydrophytic vegetation, hydric soils, and wetland hydrology. The USACE delineation manual
uses primarily field-based indicators to determine whether the three parameters are present. The
presence of positive indicators of all three parameters is necessary for a site to qualify as
jurisdictional wetlands. Additionally, portions of the riparian habitat along a river, stream, or
creek may be considered a wetland where the riparian vegetation is at or below the Ordinary
High Water Mark (OHWM) and thus also meets the USACE wetland criteria. In the absence of
wetlands, the limits of USACE jurisdiction in nontidal waters, such as rivers, streams, lakes, and
ponds, extends to the OHWM, which is defined as:
"...that line on the shore established by the fluctuation of water and indicated by
physical characteristics such as a clear, natural line impressed on the bank,
shelving, changes in the character of soil, destruction of terrestrial vegetation, the
presence of litter and debris, or other appropriate means that consider the
characteristics of the surrounding areas" (33 CFR 328.3 [e]).
A Regulatory Guidance Letter (RGL) issued by the USACE on June 27, 1987, further clarified
the definition:
"The OHWM is the physical evidence (shelving, debris lines, etc.) established by
normal fluctuations of water level. For rivers and streams, the OHWM is meant
to mark the within-channel height flows, not the average annual flood elevation
that generally extends beyond the channel" (RGL No. 88-6).
The OHWM can also be conceptualized as the lateral extent of the active channel, usually the
area just below the first terrace. The criteria for frequency and duration for the OHWM,
however, have not been defined under the Clean Water Act (CWA) .or any guidance from the
USACE for field delineators. Nonwetland waters of the U.S. have been defined as:
"...(1) all waters which are currently used, or were used in the past, or may be
susceptible to use in interstate or foreign commerce, including all waters which
are subject to the ebb and flow of the tide; (2) all interstate waters including
interstate wetlands; (3) all other waters such as intrastate lakes, rivers, streams
(including intermittent streams), mudflats, sandflats, wetlands, sloughs, prairie
potholes, wet meadows, playa lakes, or natural ponds, the use, degradation or
destruction of which could affect interstate or foreign commerce including such
waters: (i) which are or could be used by interstate or foreign travelers for
recreational or other purposes; or (ii) from which fish or shellfish are or could be
Agua Hedionda and Calavera Creeks Jurisdictional Delineation Report Page 3
0I_04080135 aguo hedionda caiaveraJDR - Appendix D.doc 4/26/2007
taken and sold in interstate or foreign commerce; or (iii) which are used or could
be used for industrial purposes by industries in interstate commerce; (4) all
impoundments of waters otherwise defined as waters of the United States under
the definition; (5) tributaries of waters identified in paragraphs (1) through (4) of
this section; (6) the territorial seas; and (7) wetlands adjacent to waters identified
in paragraphs (1) through (6) ..." (33 CFR 328.3[b]; 40 CFR 230.3[t]).
The USACE takes jurisdiction under Section 404 of the CWA for traditionally navigable waters;
all interstate waters, including interstate wetlands; all other waters, in addition to those
mentioned above, the use, degradation, or destruction of which could affect interstate or foreign
commerce; all impoundments of water that fit these definitions; territorial seas; and wetlands
adjacent to waters, other than adjacent to other wetlands. All discharges of dredged or fill
material that result in permanent or temporary losses of waters of the U.S. are regulated by the
USACE under Section 404 of the CWA (33 CFR Part 328.3).
Jurisdictional Waters of the State
Under Sections 1600-1616 of the CFGC, the California Department of Fish and Game (CDFG)
regulates activities that would alter the flow, bed, channel, or bank of streams and lakes. The
limits of CDFG jurisdiction are defined in the code as the "bed, channel or bank of any river,
stream or lake designated by the department in which there is at any time an existing fish or
wildlife resource or from which these resources derive benefit." The California Code of
Regulations (14 CCR 1.72) defines a stream as:
"[A] stream is a body of water that flows at least periodically or intermittently
through a bed or channel having banks and supports fish or other aquatic life.
This includes watercourses having a surface or subsurface flow that supports or
has supported riparian vegetation."
In practice, the CDFG usually extends its jurisdictional limit to the top of a stream, bank of a
lake, or outer edge of the riparian vegetation, whichever is wider. Riparian habitats do not
always have identifiable hydric soils or clear evidence of wetland hydrology as defined by the
USACE. Therefore, CDFG wetland boundaries often extend beyond USACE wetland
boundaries, which sometimes include only portions of the riparian habitat adjacent to a river,
stream, or lake. Jurisdictional boundaries under CFGC Sections 1600-1616 may encompass an
area that is greater than that under the jurisdiction of CWA Section 404. CDFG, however, does
not normally have direct regulatory jurisdiction over wetlands unless they are subject to
Page 4 Agua Hedionda and Calavera Creeks Jurisdictional Delineation Report
0I_04080135 agua hedionda calaveraJDR - Appendix D.doc 4/26/2007
jurisdiction under. streambed alteration agreements or they support state-listed endangered
species subject to the permitting requirements of the California Endangered Species Act.
II. METHODS
A jurisdictional delineation had previously been prepared in 2002 (RECON 2002) for a portion
of Agua Hedionda Creek to the east of the El Camino Real Bridge. The 2002 delineation also
included the confluence of Agua Hedionda and Calavera creeks. In 2006, the previous
delineation in these areas was reviewed and a wetland verification was conducted (EDAW
2006). This verification consisted of a survey of the area delineated in 2002 to observe whether
the existing conditions of Agua Hedionda Creek had substantially changed.
This jurisdictional delineation included a review of the previous reports (RECON 2002; EDAW
2006) and new delineations of Agua Hedionda Creek following emergency dredge activities and
Calavera Creek. This report accurately classifies jurisdictional features within the project area.
The results of the delineation for Agua Hedionda Creek identified the jurisdictional extent and
boundary related to hydric soil, hydrological parameters, and hydrophytic vegetation. Agua
Hedionda Creek east of the El Camino Real Bridge remained predominantly unvegetated within
the channel bottom and stream surface with ornamental vegetation along the creek banks. No
hydrophytic vegetation was found within, at the toe, or on the banks within this length of the
creek. Agua Hedionda Creek west of the El Camino Real Bridge and east of the Cannon Road
Bridge was characterized as recovering southern willow scrub and willow riparian forest habitats
and included hydrophic vegetation species; however, the area under the bridges was
characterized as unvegetated channel.
The results of the delineation for Calavera Creek identified the jurisdictional extent and
boundary primarily related to hydric soil and hydrological parameters. No hydrophytic
vegetation was observed within, at the toe, or on the banks (composed of graded slope) of
Calavera Creek.
Agua Hedionda and Calavera Creeks Jurisdictional Delineation Report Page 5
01_04080135 aua Iredionda calaveraJDR - Appendix lidoc 4/26/2007
Based on the observations of wetland parameters within the creeks and the more general lack of
hydrophytic vegetation, a delineation of unvegetated waters (composed' of OHWM) was
conducted utilizing the sampling of three separate reaches in each creek. The reaches were
established at the toe (interface of water and bank) of the bank. Placement of the reaches was
chosen and recorded when changes in stream width occurred. Due to the homogeneity of
Calavera Creek, the widths of the reaches were averaged to attain 4.25 feet. For Agua Hedionda
Creek, the reaches were averaged over the representative lengths of the creek resulting in three
distinct average widths within the channel of 82 feet for the areas downgradient (west) of the El
Camino Real Bridge, 85 feet between the El Camino Real Bridge and the confluence with
Calavera Creek, and 40 feet for the remainder of the upstream reach of the creek (Figure 2).
Riparian vegetation communities were also noted and recorded to the extent of continuous
riparian edge.
III. RESULTS
AEua Hedionda Creek
A total of 3.73 acres of jurisdictional waters of the U.S., in the form of 3.18 acres of unvegetated
waters of the U.S. and 0.55 acre of jurisdictional wetlands in the form of southern willow
scrub/willow riparian forest, exist for Agua Hedionda Creek. The creek encompasses 5.17 acres
of jurisdictional waters of the State, in the form of 3.18 acres of unvegetated waters, 0.56 acre of
southern willow scrub/willow riparian forest, and 1.43 acres of nonnative/ornamental riparian
vegetation. These were delineated as defined by the extent of OHWM and vegetation types
(Table 1).'
Calavera Creek
A total of 0.17 acre of jurisdictional waters of the U.S. exists for Calavera Creek in the form of
unvegetated waters of the U.S. The creek encompasses 0.24 acre of jurisdictional waters of the
State in the form of 0.17 acre of unvegetated channel and 0.07 acre of nonnative/ornamental
riparian vegetation. These areas were delineated as defined by the extent of OHWM associated
with the Calavera Creek (Table 1).2
'Unvegetated waters: (40 ft*2,150 ft + 85 ft*400 ft + 82 ft* 230 ft)/43,560 ft2; Riparian: (82 ft*300 ft)/43,560 ft2
2 Unvegeted waters: (4.25 ft* 1,800 ft) / 43,560 ft2
Page 6 Agua Hedionda and Calavera Creeks Jurisdictional Delineation Report
0I_04080135 agna hedionda calaveraJDR - Appendix D.doc 4/26/2007
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Scale: 1:4.200; 1 inch= 350 feet
Table 1
USACE and CDFG Jurisdictional Area within Project Area
Feature
USACE Jurisdictional Area
(Area in Coastal Zone)
CDFG Jurisdictional Area
(Area in Coastal Zone)
Agua Hedionda Creek 3.73 (0.74) 5.17 (0.75)
Calavera Creek' 0.17 0.24
Total Area (Acres) 3.90 (0.74) 5.41 (0.75)
Calavera Creek is not within the Coastal Zone.
2 Encompasses USACE jurisdictional area.
Waters
Unvegetated Channel
Unvegetated channels are typically found within ephemeral drainages in southern California, where
periodic high flows from seasonal storm events prevent the establishment of vegetation. Agua
Hedionda Creek under the El Camino Real and Cannon Road bridges and east of the El Camino
Real Bridge, and all of Calavera Creek consist of an unvegetated channel (Figures 3 and 4). Agua
Hedionda Creek is characterized by a wide channel and steep banks. Calavera Creek is
characterized by a very narrow channel and steep banks. Vegetation identified sparsely within the
creeks includes nonnative herbaceous species such as water speedwell (Veronica anagalis-
aquatica), dallies grass (Paspalus dilatatum), and green algae.
Wetlands
Wetlands are differentiated from waters at the site by the presence of hydrophytic vegetation within
the creek.
Riparian Communities with Interspersed Marsh
Agua Hedionda Creek between the El Camino Real and Cannon Road bridges consists of
recovering riparian habitat composed of vegetation species such as willows (Salix sp.) and small
patches of cattails (Typha sp.) (Figure 5). Agua Hedionda Creek in this area is also characterized by
a wide channel and steep banks.
Page 8 Agua Hedionda and Calavera Creeks Jurisdictional Delineation Report
0I_04080135 agua I,edionda ca1averaJDR . Appendix D.doc 4126/2007
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Figure 3. Agua Hedionda Creek at the confluence with Calavera Creek. Looking
upgradient (east) from the El Camino Real Bridge
Figure 4. Calavera Creek
Agua Hedionda and Calavera Creeks Jurisdictional Delineation Report Page 9
0104080135 agua hedionda caiaveraJDR - Appendix D.doc 4262007
Figure 5. Agua Hedionda Creek at El Camino Real Bridge looking downstream (west) to
the Cannon Road Bridge
Nonnative/Ornamental Vegetation
Riparian vegetation, which has been installed on the graded banks of Calavera Creek, is
primarily composed of an installed ornamental overstory of bottlebrush (Callistemon sp.),
eucalyptus (Eucalyptus sp.), pine (Pinus sp.), and an understory composed of exotic invasive
herbaceous species such as African daisies (Dimorphotheca aurantiaca), ice plant (Carpobrotus
sp.), and brome (Bromus sp.). Characteristic forbs include red-stem filaree (Erodium
cicutarium), mustard (Brassica spp.), and tarweed (Hemizonia spp.). The nonnative/ornamental
vegetation community consists of nonnative plant species typically used in residential or
commercial landscape settings. Ornamental vegetation dominates the banks of the creeks within
the Rancho Carlsbad residential community upstream of the El Camino Real Bridge. Much of
the vegetation on the slopes of the Creeks is nonnative ornamentals, though several mature
sycamores are interspersed along the banks of Agua Hedionda Creek. Though the vegetation
within the creeks is routinely cleared, it is assumed that even in the absence of this activity, the
vegetation would still be dominated by nonnative species. This is due to the large amounts of
ornamentals planted on the banks and the adjacent upland areas that are developed or support
nonnative vegetation, and concrete slabs from previous channelization (Figure 6).
Page 10 Agua Hedionda and Calavera Creeks Jurisdictional Delineation Report
0I_04080135 agua hedionda calavera JI)R -Appendix D.doc 4!2t$2007
Figure 6. Calavera Creek
IV. LITERATURE CITED
EDAW, Inc. 2006 Wetland Determination and Delineation Report for Agua Hedionda and
Calavera Creeks. Prepared for the City of Carlsbad. 05080162 Agua Hedionda Wetland
Delineation February 1, 2006.
Environmental Laboratory. 1987. Corps of Engineers Wetlands Delineation Manual. Technical
Report Y-87-1. U.S. Army Engineer Waterways Experiment Station. Vicksburg,
Mississippi.
RECON. 2002. Wetland Delineation Report for the Rancho Carlsbad Channel Maintenance
Project. Prepared for the City of Carlsbad. RECON Number 3001B August 12, 2002.
Agua Hedionda and Calavera Creeks Jurisdictional Delineation Report Page 11
01 04080135 agiia lwdio,,da caknt'raJDR - Appendix 1).doc 4262007
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Page 12 Agua Hedionda and Calavera Creeks Jurisdictional Delineation Report
0I_04080135 aia hedionda calavcraJDR - Appendix D.doc 4/26/2007
RARE PLANT SURVEY FOR
AGUA HEDIONDA AND CALAVERA CREEKS
CHANNEL DREDGING AND IMPROVEMENT PROJECT
EDAW INC October 6, 2005
1420 KETTNER BOULEVARD Mr. David Hauser
SUITE 620 City of Carlsbad
Department of Public Works-Engineering
SAN DIEGO CALIFORNIA 163.5 Faraday Avenue
Carlsbad, CA 92008-7314
92101
Subject: Rare Plant Survey for Agua Hedionda and Calavera Creeks Channel
TEL 619 233 1454 Dredging and Improvement Project
FAX 619 233 0952 Dear Mr. Hauser:
www.edaw.com On August 25, 2005, EDAW botanist John Messina conducted a rare plant survey of
the study area of. the proposed Agua Hedionda and Calavera Creeks Channel
Dredging and Improvement Project (Figure 1). The limits of the study area included
the channel bed and banks of Agua Hedionda and Calavera creeks and the berms and
bottom of the Detention Basin BJB. The study area is depicted in Figure 1 This
survey was conducted on foot.
Much of the study area is disturbed. Both Agua Hedionda and Calavera creeks have
been channelized. Sparse disturbed wetlands dominated by nonnative and native
herbaceous species such as annual beard grass (Polypogon monspeliensis), water
speedwell (Veronica anagallis-aquatica), Dallis grass (Paspalum dilatatum),
umbrella sedge (Cyperus sp.), and salt heliotrope (Heliotropium curassavicum) occur
in the. channels of the two creeks within the. Rancho Carlsbad Mobile Home Park
(RCMHP). Ornamental vegetation with an occasional western sycamore (Platanus
racemosa) occurs along the creek banks. The channels are periodically cleared of
vegetation to reduce flooding threats, hence the sparse vegetation within the creeks.
To the west of the RCMHP, Agua Hedionda Creek is vegetated with mature willow
forest, dominated by several willow species including arroyo willow (Salix lasiolepis)
and Goodding's black willow (Salix gooddingii). The Detention Basin BJB was
constructed in prior agricultural land and supports southern willow scrub/freshwater
marsh habitat at its southern end. Arroyo willow and cattails (Typha latfolia) are the
two dominant species here. Disturbed vegetation dominated by horseweed (Conyza
canadensis) and Indian sweetclover (Melilotus indica) occurs on the berms of the
detention basin. Calavera Creek, where it is immediately adjacent to and east of the
detention basin, is dominated by mature sycamore woodland. The limited native
vegetation such as the willow forest to the east of the RCMHP or the wetland habitat
in the creeks or detention basin has recolonized these areas after prior disturbances.
As such, potential habitat for rare plants is minimal.
UNITED STATES Though the rare plant survey was conducted late in the year and early ephemeral
spring species would not have been detectable at the time of the survey, the potential
EUROPE for the occurrence of such species is considered very low. The rare plant survey
AUSTRALIA
ASIA DESIGN, PLANNING AND ENVIRONMENTS WORLDWIDE
Mr. David Hauser
City of Carlsbad
Department of Public Works-Engineering
October 6, 2005
Page 2
focused on San Diego ambrosia (Ambrosia pumila), a federal endangered species that
occurs in mesic grasslands and sage scrub generally along the periphery of
intermittent streams and river courses. This species has a traditional blooming period
of May through September; therefore, if the species was present it would have been
identified. However, San Diego ambrosia or other rare plant species were not
observed during the survey. No rare plant species are expected to occur within the
study area given its relatively disturbed condition and long history of periodic
disturbances. Additionally, rare plant species within or along Agua Hedionda Creek
were not detected during surveys in 2002 (RECON 2002).
If you have any questions please do not hesitate to contact me at 619.233.1454,
ext. 347.
Sincerely,
9
John J. Messina
Botanist
Attachment: Figure 1 - Rare Plant Survey Area
cc: Jacqueline Dompe
Teresa Wilkinson
05080162 Rare Plant Ltr rpt.doc
DESIGN, PLANNING AND ENVIRONMENTS WORLDWIDE
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Rare Plant Survey Area
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POST-SURVEY NOTIFICATION
OF FOCUSED SURVEY RESULTS
FOR THE LEAST BELL'S VIREO
AND SOUTHWESTERN WILLOW FLYCATCHER
ON THE AGUA HEDIONDA SITE
September 20, 2005
Mr. Daniel Marquez
U.S. Fish and Wildlife Service
Carlsbad Field Office
6010 Hidden Valley Road
Carlsbad, CA 92009
Reference: Post-Survey Notification of Focused Survey Results for the Least Bell's Vireo and
Southwestern Willow Flycatcher on the Agua Hedionda Site in the City of Carlsbad,
California (RECON Number 4138B)
Dear Mr. Marquez:
This letter is to notify the U.S. Fish and Wildlife Service (USFWS) of the results of focused surveys
for the least Bell's vireo (Vireo, be//il pusillus) and southwestern willow flycatcher (Empidonax trail/li
extimus) conducted on the Agua Hedionda Site (site) in the City of Carlsbad, California. The, site is
west and east of El Camino Real, north and south of Cannon Road, and approximately four miles
east of Interstate 5 (Figures 1, 2, and 3). Agua Hedionda Creek flows through the site, which is
immediately bounded by residential development, roads, and undeveloped riparian and upland
habitat (see Figure 3). The site is comprised of undeveloped upland and riparian habitat, and
developed land (see Figure 3).
Methods
RECON biologist Cynthia Jones conducted the focused surveys for southwestern willow flycatcher
under USFWS permit number TE-81 1615 according to USFWS survey guidelines (USFWS 2000),
which requires five surveys. One survey is conducted in each of the two periods from May 15
through May 31 and from June 1 through June 21. Three surveys are conducted between June 22
and July 17; with at least five days separating consecutive surveys. Surveys were conducted by
walking meandering transects throughout and adjacent to areas of suitable southwestern willow
flycatcher habitat. A vocalization tape was played at approximately 200-foot intervals in an attempt
to elicit a response from the birds. Approximately 3.16 acres of suitable habitat was surveyed on-
site. All bird species observed during the surveys were noted. The specifics of survey dates,
times, and weather conditions are provided in Table 1.
RECON biologists Darin Busby and Amy Clark conducted the focused surveys for least Bell's
vireo according to USFWS survey guidelines (USFWS 2001), which requires eight surveys at
least 10 days apart between April 1 and July 31. Surveys were conducted by walking meandering
transects throughout and adjacent to areas of suitable least Bell's vireo habitat. Approximately
3.16 acres of suitable habitat was surveyed on-site. All bird species observed during the surveys
were noted. The specifics of survey dates, times, and weather conditions are provided in Table 1.
Existing Conditions
Twelve vegetation communities and land cover types occur in the 19.24-acre study area: willow
riparian forest, freshwater marsh, southern willow scrub, revegetated southern willow scrub, mule
fat scrub, revegetated mule fat scrub, revegetated coastal sage scrub, disturbed coastal sage
Mr. Daniel Marquez
Page 2
September 20, 2005
scrub, revegetated coastal salt marsh, unvegetated channel, ornamental vegetation, and
developed land. The surveys for southwestern willow flycatcher and least Bell's vireo were
conducted in the suitable habitat within willow riparian forest, southern willow scrub, mule fat
scrub, and freshwater marsh vegetation communities.
Willow riparian forest habitat, totaling approximately 2.22 acres, occurs along the main channel of
Agua Hedionda Creek. The dominant tree species in this community is black willow (Salix
gooddingii, although lesser quantities of arroyo willow (S. lasiolepis) and narrow-leaved willow
(S. exigua) are also present. Willow riparian forest supports many native and non-native
herbaceous species in the understory.
Approximately 0.86 acre of freshwater marsh occurs in the western portion of the study area. The
dominant plants in this community include cattails (Typha spp.), spiny rush (Juncus acutus ssp.
leopoldi,), rush (Juncus sp.), California bulrush (Scirpus californicus), and yerba mansa
(Anemopsis californica).
A total of approximately 0.62 acre of southern willow scrub and 0.06 acre of revegetated southern
willow scrub occur along Agua Hedionda Creek in the portions of the study area to the west and to
the south of the intersection of El Camino Real and Cannon Road. The vegetation community is
dominated by arroyo willow, with some areas containing understory plant species such as spiny
rush and saltgrass (Distichlls spicata).
Mule fat scrub is present on approximately 0.09 acre in the western portion of the study area. In
addition, approximately 0.12 acre of revegetated mule fat scrub is present in the revegetated
native habitat to the northwest of the intersection of El Camino Real and Cannon Road. This
vegetation community is dominated by mule fat (Baccharis salicifolia).
Approximately 0.63 acre of revegetated coastal sage scrub and 0.39 acre of disturbed coastal
sage scrub occur west of the intersection of El Camino Real and Cannon Road. The community is
dominated by California sagebrush (Artemisia californica) and California buckwheat (Eriogonum
fasciculatum var. fasciculatum). Black sage (Salvia meiifera), blue elderberry (Sambucus
mexicana), laurel sumac (Malosma laurina), bladderpod (!someris arborea), and broom baccharis
(Baccharis sarothroides) are also present. Understory species include both native and non-native
species, such as slender stephanomeria (Stephanomeria virgata), coast goldenbush (Isocoma
menziesii), filaree (Erodium sp.), wild oats (Avena sp.), and California broom (Lotus scoparius).
Non-native plant species within the disturbed coastal sage scrub include filaree, ripgut grass
(Bromus diandrus), tocolote (Centaurea meiltensis), black mustard (Brassica nigra), fennel
(Foeniculum vulgare), Russian thistle (Salsola tragus), and tree tobacco (Nicotiana glauca).
Revegetated coastal salt marsh is present in the northwestern portion of the project area. Totaling
approximately 1.22 acres, this vegetation community is dominated by pickleweed (Sailcomia spp.)
and alkali-heath (Frankenia sauna), with lesser amounts of other native halophytes.
Unvegetated channel occurs in Agua Hedionda Creek and Calaveras Creek with the residential
development to the east of the intersection of El Camino Real and Cannon Road. Unvegetated
channels are typically found within ephemeral drainages in southern California, where periodic
high flows from seasonal storm events prevent the establishment of vegetation. In this case,
however, approximately 2.78 acres of unvegetated channel occur in relatively wide, gently sloping,
perennially flowing streambeds due to regular vegetation removal by the surrounding community.
A total of 9.77 acres of ornamental vegetation is present along Agua Hedionda Creek and
Calaveras Creek within the community to the east of the intersection of El Camino Real and
Mr. Daniel Marquez
Page 3
September 20, 2005
Cannon Road. Although some native tree species such as western sycamore (Platanus
racemosa) occur along these creeks, the highly disturbed and widely spaced nature of the
vegetation precludes the development of functional riparian habitat in these regions. No shrub or - herbaceous component exists within this vegetation community other than ornamental grass and
other scattered non-native species.
Approximately 0.48 acre of developed land occurs in the study area. These areas are composed
of dirt trails and roads.
Survey Results
Least Bell's vireo and a migratory willow flycatcher were observed on-site during the focused
surveys conducted for these species. In addition, two California species of special concern, yellow
warbler (Dendroica petechia) and yellow-breasted chat (Icteria virens auricollis), were detected
on-site during the focused surveys.
One willow flycatcher and two least Bell's vireo were detected within the southern willow scrub
along Agua Hedionda Creek west of the intersection of El Camino Real and Cannon Road. The
willow flycatcher was detected during the first of the five focused surveys and was not seen during
any of the subsequent surveys, indicating the individual was using the habitat as a stopping point
during its migration north. One yellow warbler was detected within the southern willow scrub along
Agua Hedionda Creek west of the intersection of El Camino Real and Cannon Road. One yellow-
breasted chat was detected within the southern willow scrub along Agua Hedionda west of the
intersection of El Camino Real and Cannon Road. The locations of these sensitive bird species
are shown in Figure 4.
Birds commonly observed in the riparian areas during the surveys for least Bell's vireo and
southwestern willow flycatcher included western scrub-jay (Aphelocoma californica), wrentit
(Chamaea fasciata henshawi), lesser goldfinch (Carduelis psaltria hesperophilus), Pacific slope
flycatcher (Empidonax difficilis), Anna's hummingbird (Calypte anna), bushtit (Psaltriparus
minimus), orange-crowned warbler ( Vermivora celata), common yellowthroat (Geothlypis trichas),
spotted towhee (Pipilo maculatus), European starling (Stumus vulgaris), and Nuttall's woodpecker
(Picoides nuttalli,). Two brown-headed cowbirds (Molothrus ater) were detected within the
southern willow scrub along Agua Hedionda Creek south of Cannon Road and west of El Camino
Real (see Figure 4).
If you have any questions concerning the focused surveys or the contents of this letter, please
contact Wendy Loeffler at (619) 308-9333.
Sincerely,
Wendy Loeffler
Biologist
DAB: WE L: ash
cc: Glen Van Peski, GVP Consultants
Cynthia Jones
Mr. Daniel Marquez
Page 4
September 20, 2005
References Cited
U.S. Fish and Wildlife Service (USFWS)
2000 Survey Protocol for the Southwestern Willow Flycatcher, Revised. July 11.
2001 Least Bell's Vireo Survey Guidelines. January 19.
I certify that the information in this survey report and attached exhibits fully and accurately
represents my work.
Amy Clark Date
No longer employed at
RECON: signature not available.
Darin Busby Date
Cindy Jones Date
Permit Number TE-81 1615
TABLE I
SOUTHWESTERN WILLOW FLYCATCHER AND
LEAST BELL'S VIREO FOCUSED SURVEY DATES, TIMES, AND WEATHER CONDITIONS
Date Personnel Survey Time - Weather Conditions
5/9/05 Darin Busby LBV #1 10:00-11:00A.M. 70°F; 20% cloud cover and haze;
Amy Clark wind 2-3 mph
5/19/05 Darin Busby LBV #2 10:00-11:00 A.M. 75-77°F; 0% cloud cover;
Cindy Jones WIFL#1 wind 1-5 mph
6/2/05 Darin Busby LBV #3 10:00-11:00 A.M. 70°F; 100% cloud cover and haze;
Cindy Jones WIFL #2 wind 2-5 mph
6/13/05 Darin Busby LBV #4 10:00-11:00 A.M. 72°F; 100% cloud cover and haze;
wind 0-1 mph
6/23/05 Darin Busby LBV #5 9:00-10:OOA.M. 65°F; 100% cloud cover and haze;
Cindy Jones WIFL#3 wind 0-2 mph
6/29/05 Cindy Jones WIFL #4 9:00-9:30 A.M. 66-68°F; 90% cloud cover, breaking up;
wind 0-3 mph
7/12/05 Darin Busby LBV #6 8:15-9:05 A.M. 69-70°F; 100-50% cloud cover and haze;
Cindy Jones WlFL#5 I wind 0-5 mph
7/25/05 Darin Busby LBV #7 7:30-8:20 A.M. 69-70°F; 100% cloud cover and haze;
wind 0 mph
8/5/05 Darin Busby LBV #8 7:10-8:00 A.M.. 64-65°F; 100% cloud cover and haze;
wind 0-1 mph
= degrees Fahrenheit; % = percent; mph = miles per hour.
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RESULTS OF THE FOCUSED FIELD SURVEY
FOR THE LIGHT-FOOTED CLAPPER RAIL
FOR THE AGUA HEDIONDA AND CALAVERA CREEKS
DREDGING AND IMPROVEMENTS PROJECT
Koawcw 131oeo.jicae Services
Biological Consulting, Research, Conservation
May 11, 2006
06-01-A
EDAW, Inc.
1420 Kettner Blvd.
San Diego, California, 92101
Attn: Teresa Wilkinson, Senior Project Manager
Re: Results of a Focused Field Survey for the Light-footed Clapper Rail at the Agua Hedionda and
Calavera Creek Dredging and Improvement Project, San Diego County, California, 2006.
Dear Ms. Wilkinson:
This letter report presents the results of focused field surveys for the light-footed clapper rail (Rallus
longirostris levipes), for the Agua Hedionda and Calavera Creek Dredging and Improvement Project in
coastal San Diego County, California. The light-footed clapper rail is listed as an endangered species by
the U.S. Fish and Wildlife Service (USFWS) and the California Department of Fish and Game (CDFG).
Surveys for the light-footed clapper rail were conducted by wildlife biologist John Konecny, following
methodology formulated by Konecny Biological Services (KBS) in consultation with light-footed clapper
rail principal investigator Richard Zembal, and approved by the USFWS. This activity is authorized by
KBS's USFWS section 10(a) permit number TE837308-3, and a CDFG Memorandum of Understanding.
INTRODUCTION
The light-footed clapper rail is a slender, tawny-breasted bird with grayish edges on brown centered back
feathers, olive wing coverts, vertical white bars on the flanks, a white stripe over the eye, and a partially
orange bill. Light-footed clapper rail occurred historically along the coast of southern California from
Carpinteria Marsh in Santa Barbara County south to San QuintIn, Baja California, Mexico (Grinnell and
Miller 1944, USFWS 1994).
The light-footed clapper rail is a permanent resident of coastal salt marsh traversed by tidal sloughs,
usually characterized by cordgrass (Spartina foliosa) and pickleweed (Salicornia spp.)(Grinnell and
Miller 1944, USFWS 1994). Light-footed clapper rails have also nested in freshwater marsh
characterized by cattails (Typha sp.) and bulrush (Scirpus sp.) at Buena Vista, Agua Hedionda, Batiquitos,
San Elijo, and San Dieguito Lagoons in San Diego County (Zembal et al 2005); and in spiny rush (Juncus
acutus) at Naval Air Station (NAS) Point Mugu. There is very limited evidence for inter-marsh
movement by light-footed clapper rails.
Populations of light-footed clapper rails have undergone decline in the United States due to the rail's
limited distribution and destruction and degradation of coastal salt marsh habitat. The statewide breeding
rail population in 2005 was reported to be 360 pairs in 16 marshes (Zembal et al 2005), the largest
number of rails in recent history since the statewide census began in 1980. Seventy-three percent of these
pairs were found in two coastal salt marsh complexes at Upper Newport Bay and the Tijuana Marsh
National Wildlife Refuge.
Zembal and Massey (1986) have shown that paired light-footed clapper rails can be detected "clappering"
throughout the year, but have a bimodal peak in vocalizing during mid-February to mid-April and again
in September to October. The initial peak in vocalizing corresponds to the onset of breeding season. In
contrast to "clappering", single male and female "keking" is highly seasonal, almost exclusively
occurring between February and June.
1501 East Grand Avenue #2403, Escondido, California, 92027
Tel (760) 489-5276 E-mail jkonecny@nethere.com
Ms. Teresa Wilkinson Page 2
PROJECT LOCATION
The Agua Hedionda and Calavera Creek Dredging and Improvement Project site is located in Agua
Hedionda Creek, approximately two miles (3.4 kilometers) east of Agua Hedionda Lagoon in the City of
Carlsbad, coastal San Diego County, Californa (Figure 1). The project is located mostly upstream of El
Camino Real and south of Cannon Road, extending approximately 3,000 feet (910 meters) eastward up
Agua Hedionda Creek, and approximately 4,000 feet (1,212 meters) northward up Calavera Creek.
During the March 2006 Emergency Dredge Project, no dredging was done along Agua Hedionda creek
downstream of the Cannon Road Bridge and west of El Camino Real.
Specifically, the Agua Hedionda and Calavera Creek Improvement Project site is located within
Township 12 South, Range 4 West, and in a numbered section of the U.S. Geological Survey San Luis
Rey, CA. 7.5-minute quadrangle.
PROJECT SITE DESCRIPTION
The City of Carlsbad (City) proposes to conduct the channel dredging and other maintenance activities
along Agua Hedionda and Calavera creeks to provide enhanced flood protection for the residential
community of Rancho Carlsbad. Project components include:
Dredging and improvements of Agua Hedionda and Calavera creeks
Stabilization of Calavera Creek channel and bank
Removal of the existing weir wall structure along the north side of Calavera Creek
Modifying the outlet of the BiB Basin culvert
Modifying existing piers under Cannon Road and El Camino Real bridges
Long-term maintenance of Agua Hedionda and Calavera creeks
Rancho Carlsbad is an existing residential mobile home community located east of El Camino Real and
south of Cannon Road, in the northeastern section of Carlsbad, California. Over 50 percent of the homes in
Rancho Carlsbad occur within the existing limits of the 100-year floodplain and are currently subject to
flood damage during a major storm event
Agua Hedionda and Calavera creeks flow within constructed earthen channels throughout the entire
extent of the project. Agua Hedionda Creek flows westerly through the southwestern portion of Rancho
Carlsbad, bends southwesterly at the confluence with the Calavera Creek tributary, and exits the Rancho
Carlsbad community as it passes beneath El Camino Real. West of El Camino Real, Agua Hedionda
Creek bends into a westerly direction where it passes beneath Cannon Road and flows into a natural
stream channel within an unimproved floodplain that drains into Agua Hedionda Lagoon. Two road
crossings, Cannon Road Bridge and El Camino Real Bridge, are located within the downstream portion of
the project boundary.
Calavera Creek flows south from a flood detention facility, known as Basin BIB, through a box culvert
under the intersection of College Boulevard and Cannon Road and enters the Rancho Carlsbad
community at the point of confluence with a tributary creek known as Little Encina Creek. Within the
Rancho Carlsbad community, Calavera Creek flows southwesterly along the northwesterly boundary of
Rancho Carlsbad community to a point of confluence with Agua Hedionda Creek located approximately
300 feet east of El Camino Real.
Much of the area of the Agua Hedionda Creek watershed in the Calavera Hills area, including the portion
of the creek that extends through the Rancho Carlsbad residential community has been highly disturbed in
Ms. Teresa Wilkinson Page 3
the recent past by channelization and converted to residential housing. Very little native vegetation exists
upstream of the confluence of Agua Hedionda Creek and Calavera Creek, and between the confluence
and El Camino Real in the project area. The creeks are basically a denuded sandy bottom with non-native
ornamentals on the side slopes. No light-footed clapper rail habitat is present in these two reaches of the
project site.
The area upstream of the existing weir wall on Calavera Creek near the intersection of College Boulevard
and Cannon Road has been channelized and a detention basin is present to its immediate north. The
vegetation present here is riparian woodland and a disturbed mule-fat scrub. No light-footed clapper rail
habitat is present in this area.
The area west and downstream of El Camino Real consists of three distinct segments. The southern-most
segment, southeast of the dirt access road is considered "open space" by the City of Carlsbad, and
consists of freshwater marsh characterized by extensive cattails with emergent willows, mule-fat
(Baccharis salicjfolia), and Eucalyptus.
The middle and smallest segment, located between the access road and Cannon Road was dredged in
March 2006. Vegetation removal within the creek channel occurred between the two bridge structures,
resulting in the removal of mature overstory of willow riparian woodland, characterized by black willow
(Salix goodengii), arroyo willow (S. lasiolepis), sandbar willow (S. hindsiana), and mule-fat. The
understory was poorly developed. Light-footed clapper rail habitat was not present in this reach.
The third area, located outside the project work limits and downstream of the Cannon Road Bridge and
west of El Camino Real is a mosaic of freshwater marsh and willow riparian woodland, with scattered
Eucalyptus. This reach of habitat continues downstream and is continuous with Agua Hedionda Lagoon
proper. Elevation of the project site is approximately 60 feet (18 meters) to 100 feet (30 meters) above
mean sea level.
METHODS
At this time, the USFWS does not have a survey protocol for the light-footed clapper rail. Surveys were
conducted following a methodology formulated by KBS in consultation with light-footed clapper rail
principal investigator Richard Zembal, and approved by the USFWS.
Five focused light-footed clapper rail surveys were conducted at least seven days apart between February 13th and March 14th, 2006. Dusk surveys were conducted on February 13th, March 71h and March 14th,
2006. Dawn surveys were conducted on February 20th and February 27th, 2006. Each dawn and dusk
survey lasted approximately two-hours. Dawn surveys were conducted from pre-dawn to no later than
two-hours after sunrise. Dusk surveys were conducted between sunset and no more than two-hours prior
to sunset. A summary of the environmental conditions on the five survey dates is provided in Table 1.
The surveys were conducted by stopping at stations approximately 50-feet (17-meters) apart along the
perimeter of the survey area and listening for vocalizing light-footed clapper rails. If rails were not
detected passively, a call-prompt or tape-recorded vocalization of the light-footed clapper rail "dueting"
was played at 15-second intervals alternating with 15 seconds of listening. A response was listened for in
the final three minutes before proceeding to the next survey station.
RESULTS
Two pairs of light-footed clapper rails were detected in the freshwater marsh north of Cannon Road, and
west and downstream of El Camino Real. No rails were detected in the freshwater marsh south of
Cannon Road and west of El Camino Real. One rail was initially detected on February 13th, near the
Ms. Teresa Wilkinson Page 4
Eucalyptus grove immediately west of El Camino Real and north of Cannon Road. No rails were
detected on the morning of February 2O'. Two pairs of "dueting" light-footed clapper rails were detected
the morning of February 27th, and subsequently relocated during the dusk surveys of March 7th and 14'.
The light-footed clapper rail locations are shown in Figure 2. No other endangered or threatened species
were detected.
DISCUSSION
Described as "formerly common in all coastal marshes" by Grinnell and Miller (1944), the light-footed
clapper rail has never been a common bird species at Agua Hedionda Lagoon in recent history. The rail
population has vacillated between two and five pairs between 2000 and 2005, and has been at one or less
from 1997 and before (Zembal et al 2005). During 2005, one pair of clapper rails was present in the
freshwater marsh west of El Camino Real and a second pair was present farther downstream, well beyond
the 500 foot buffer area.
During vegetation removal conducted as part of the 2006 Emergency Dredge project, no disturbance
occurred to the light-footed clapper rails in the area, as rails were detected in the same areas after the
emergency dredging, that they were present in before the activity. The following measures are
recommended to avoid or minimize potential light footed clapper rails and their habitat.
To avoid potential downstream sedimentation/siltation within the freshwater marsh located
downstream of Cannon Road Bridge, the City should include revegetation efforts consisting of
willow woodland species present in the area (i.e., arroyo willow, black willow, sandbar willow,
and mulefat).
Avoid construction impacts during the bird nesting season (March 1 throüjh September 15 for the
light-footed clapper rail).
2) Survey the area and surrounding 500 foot buffer area for light-footed clapper rails prior to
implementation of dredging activities (there is no need to survey the area upstream of El Camino
Real unless substantial freshwater marsh is allowed to grow back). If clapper rails are
detected in the impact area, they should be flushed, prior to the onset of any vegetation removal
Install a physical barrier (construction fence) on the upstream side of Cannon Road before
dredging or vegetation removal commences. The barrier may be removed once the construction
activity has ceased on the south side of El Camino Real.
I certify that the information in this survey report and attached exhibits filly and accurately represent my
work. The results of focused surveys for listed species are typically considered valid for one year by the
USFWS and CDFG. If you have any questions or require additional information, please call me at (760)
489-5276.
Sincerely,
. bQ1lQ,•
John. K. Konecny
Wildlife Biologist
TE83 73 08-4
Ms. Teresa Wilkinson Page 5
REFERENCES CITED
Grinnell, J., and A.H. Miller. 1944. The Distribution of the Birds of California. Cooper Ornithological
Club. Berkeley, California.
U.S. Fish and Wildlife Service. .1994. Light-footed Clapper Rail. Unpublished two-page pamphlet,
prepared by R. Zembal.
Zembal, R., S. Hoffman, and J. Konecny. 2005. Light-footed Clapper Rail Management, Study, and
Translocation, 2004. Report to Naval Base Ventura County, Point Mugu; U.S. Fish and Wildlife
Service; and California Department of Fish and Game, for California State University, Long
Beach Foundation and El Dorado Audubon Society.
Zembal, R. and B. W. Massey. 1986. Seasonality of Vocalizations by Light-footed Clapper Rails. J.
Field Ornithol., 58(1):41-48.
Table 1. Summary of Weather Conditions During Five Light-footed Clapper Rail Surveys at the
Agua Hedionda and Calavera Creek Improvement Site, 2006.
Survey # Date Surveyor (Species) Time Weather Conditions
1 02/13/06 JK (LFCR) 1310-1650 20% overcast, 60-58F, wind 4-7 mph
2 02/20/06 JK (LFCR) 0630-0845 100% overcast, 44-46F, wind 1-3 mph
3 02/27/06 JK (LFCR) 0640-0850 100% overcast, 52-55F, wind 1-3. mph
4 1 03/07/06 1 JK (LFCR) 1505-1700 70% overcast, 62-60F, wind 1-3mph
5 1 03/14/06 1 JK (LFCR) 1 1510-0715 60% overcast, 64-66F, wind 3-5 mph
Ms. Teresa Wilkinson Page 6
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Project Location
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Scale: 1: 24,0; 1 inch = 2,000 feet
Agua Hedionda and Calavera Creeks Light footed Clapper Rail Field Survey Report
Path: P:200505080I62AguaHedioith weilandDeli,,ealio,,JGISMxitRg I Field SurwyRepofl.n,xd, 060/06. marraccinib
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Ms. Teresa Wilkinson Page 7
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Figure 2. Location of Light-footed Clapper Rail Pairs at the Agua Hedionda Creek Emergency
Dredge Work Site, San Diego County, California, 2006.
BIOLOGICAL TECHNICAL REPORT
FOR THE RANCHO CARLSBAD
CHANNEL MAINTENANCE PROJECT
BIOLOGICAL TECHNICAL REPORT FOR THE
RANCHO CARLSBAD CHANNEL MAINTENANCE
PROJECT
Prepared for
CITY OF CARLSBAD
1635 FARADAY AVENUE
CARLSBAD, CA 92008
, Prepared by
GERALD A. SCHEIL)
SENIOR BIOLOGIST
RECON NUMBER 3001B
AUGUST 12, 2002
1927 FilTh Avenue. • • • .i&.E (II C).:
.Snn Dleoo. CA 92101-2358 -
•
TABLE OF CONTENTS
Summary of.Findings 1
Introduction
Survey Methods 4
Results .
. 4
Topography and Soils .
. .4
Botany 6
Zoology 6
Sensitive Biological Resources . 8
Multiple Habitat Conservation Program 13
Project Impacts .
. 13
A. Plant Community Impacts 13
B. Non-Sensitive Wildlife Impacts 13
C. Sensitive Biological Resources Impacts 14
Mitigation Measures and Recommendations
.
. 14
References Cited is
FIGURES
Regional Location . . . 2
Project Location on USGS Map 3
Agua Hedionda Creek Vegetation Map . 7.
PHOTOGRAPHS .
Agua Hedionda creek within the.RCMHP . . 5
Agua Hedionda Creek - View of El Camino Real Bridge 5
TABLE OF CONTENTS (cônt.)
ATTACHMENTS
I: Plant Species Observed
2: Wildlife Species Observed/Detected on The Site
of Findings
I:he proposed Rancho Carlsbad Channel Maintenance Project involves the removal of
accumulated sediment from Agua Hedionda Creek within the Rancho Carlsbad Mobile
,Rome Park. The sediment removal would temporarily impact 4.2 acres of Agua
Jhxlionda Creek and 0.1 acre of developed land. Channel hydraulic capacity will be
Increased by the sediment removal and the flood prone area adjacent to the creek will be
jecreased, benefiting the local residents. A long-term maintenance program for this
section of Agua Hedionda creek will be developed to maintain sediment levels for
maximum channel capacity.
Introduction
The Rancho Carlsbad Channel Maintenance Project is intended to minimize the 100-year
flood inundation area within the Rancho Carlsbad Mobile Home Park (RCMHP).
.:RC'MHP is located north and east of El Camino Real midway between College Boulevard
uid Tamarack Avenue in the city of Carlsbad (Figures 1. and 2). RCMHP Contains
portions of both Agua Hedionda Creek and Calavera Creek. Agua Hedionda Creek flows
Westerly through the southern portion of RCMHP. Calavera Creek flows southwesterly
Wong the northern property boundary. Calavera Creek has its confluence with Agua
Nedionda Creek within RCMHP approximately 300 feet upstream of the bridge at El
Camino Real.
The original design configuration of the channelized section of Agua Hedionda Creek
through RCMHP, approved in March 1971, consisted of a trapezoidal channel with 2:1
(horizontal: vertical) side slopes, a depth of approximately 11.5 feet and a bottom width
that varied from 58 feet at the El Camino Real bridge to 44 feet upstream of the
confluence.
The proposed channel maintenance project involves silt removal from Agua Hedionda
Creek from the bridge at El Camino: Real upstream for a distance of approximately 2,400
feet. No silt removal will occur within Calavera Creek as part of this project The bottom t!- if Agua Hedionda Creek has no woody perennial vegetation and has experienced a
buildup of as much as seven feet of silt over the years The creek has never been cleared
of silt since it was constructed approximately 30 years ago This has reduced its capacity
to convey flood flows and increased the likelihood of inundation of areas adjacent to the
creek
it is estimated that approximately 30,000 cubic yards of silt material will be excavated
*rn Agua Hedionda Creek within RCMHP. The disposition of the 30,000 cubic yards of
1
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material , will be accommodated within features of nearby projects (e.g., road beds,
berms). "
In addition to silt, removal, channel widening of Agua Hedionda Creek is proposed
between El Camino Real and the confluence with Càlâvera Creek. The widening will be
up to approximately 25 feet This will allow a further reduction in water surface
elevation within the RMHP.
This report provides biological data and background information required for environ-
mental analysis by the Draft City of Carlsbad Multiple Habitat Conservation Plan
(MHCP) Subarea Plan, the California Environmental Quality Act (CEQA), and the
National Environmental Policy Act (NEPA).
Survey Methods
Surveys were conducted in the project area in the spring of 2002. RECON biologists
walked along Agua Hedionda Creek, surveying the channel bed and banks. Animal
species were either observed' directly with the aid of binoculars or detected indirectly
from call, tracks, scat, nests, or other sign. Plant species were identified in the field or in
the laboratory. -.
Floral nomenclature follows Hickman (1993), while plant community classifications
follow the CalifOrnia Natural Diversity Data Base (NDDB) (Holland 1986). Zoological
nomenclature for birds is..*in accordance with the American Ornithologists' Union
Checklist (1998); for mammals, Jones et al. (1988); and for amphibians and reptiles,
Collins (1990). Assessments of the sensitivity of species and habitats are based primarily
on the California Native Plant Society's (CNPS) Inventory of Rare and Endangered
Vascular Plants of California (2001), State of California (2002a, 2002b), and Holland
(1986).
Results
A. Topography and Soils
The topography is relatively flat along Agua Hedionda Creek. Elevations on-site range
from approximately 70, to 100 feet above mean sea level (AMSL). Representative
photographs of this reach of Agua Hedionda Creek are provided (Photographs I, and 2)
PHOTOGRAPH 1
Agua Hedionda Creek within RCMHIP
ON PHOTOGRAPH 2
Agua Iledionda Creek - View of El Camino Real Bridge
I\graphicsbiotc6phOtOSI-2.6
alluvial fans and floodplains and have slopes of zero to five percent. Riverwash is a soil
classification that refers to a mixture of accumulated sediments in river, stream, creek, or
other drainage channels.
Botany
This section of Agua Hedionda Creek does not support native perennial woody trees or
shrubs, but does support some native annual and perennial herbaceous species in the
channel bed on a seasonal basis, and non-native ornamental species on the banks
(Figure 3). A complete list of plant species observed on-site at the time of the survey is
given in Attachment 1.
Seasonal flood flows scour the creek channel frequently enough to prevent the
establishment of native woody perennial species. The active movement of sediment on a
yearly basis allows for the temporary establishment of some native annual and perennial
herbaceous species. The distribution and size of the populations of these annual and
perennial species depends on the magnitude, duration, and frequency of the seasonal
storm events. In a typical or average year, these species would be more abundant during
the low flow dry season and less abundant or temporarily gone during the wet season.
Annual and perennial herbaceous species commonly observed On the sandbars of the
creek channel during the survey include water cress (Rorripa nasturtium-Agua
Aguaficurn),. wild celery (Apium graveolens), umbrella sedge (cyperus sp.), water
speedwell (Veronica anagailis-Agua Aguatica), brass buttons (cotula coronopifolia),
:1 common plantain (Plantago major), and annual beard grass (Polypogon n.onspeiiensis).
The manufactured banks of the creek channel are vegetated with primarily non-native
ornamental species that include trees (e.g., eucalyptus, pine, London plane,
Peruvian/Brazilian pepper, palm, and olive), shrubs (e.g., pyracantha, myoporum,
snowberry), and ground cover plants (e.g., sea fig, wandering jew, gazania, and ivy).
Zoology
A complete list of wildlife species observed within the project area, is provided in
Attachment 2. -
1. Amphibians
:• Pacific tree frogs (Hyiá regilla) were observed in the creek. Other amphibian species with
potential to occur include California frog (Hyla cadaverina) and bullfrog (Rana
eatesbejana).
:11
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Vegetaton FIGURE 3 Herbaceous vegetationIILUUI
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Reptiles
One reptile species, the side-blotched lizard (Uta stansburiana), was observed on the
banks of the creek. Other reptiles expected to occur include western fence lizard
(Scélporus occidentalis), alligator lizard (Elgaria muizicarinata webbi), California
kingsnake (Lanipropeltis getulus ca1forniae), and two-striped garter snake (Thamnophis
hammondii).
Birds
Bird species observed along the creek include morning dove (Zenaida .rnacroura
marginella), Anna's hummingbird (Calypte anna), Nuttall's woodpecker (Dendrocopos
nurtallii), black phoebe (Sayornis nigricans semiatra), and, house finch (Carpodacus
mexicanusfrontalis). Families of mallard (Anas plazyrhynchos) were observed swimming
in the active channel and roosting on the sandbars. Three raptor species were observed.
A sharp-shinned hawk (Accipiter striatus velox) was observed in the non-native
vegetation along the banks of Agua Hedionda Creek. A white-tailed kite (Elanus
leucurus) and a red-shouldered hawk (Buteo lineatus elegans) were observed flying over
the project area. All three raptor species observed have the potential to nest in the trees
located on the banks of the creek and within the RCMHP.
Mammals
Two species of mammal were observed, the California ground squirrel (Spermophilus
beecheyi) and cottontail rabbit (Sylvilagus audubonii). Other species expected to occur
include raccoon (Procyon lotor), striped skunk (Mephitis mephitis), San Diego black-
tailed jackrabbit (Lepus caljfornicus bennettii), and coyote (Canis latrans).
D. Sensitive Biological Resources
For purposes of this report, species will be considered to be sensitive if they are: (1) listed
as a MHCP covered species or narrow endemic species in the Draft Subarea Plan,
(2) listed by state or federal agencies as threatened or endangered or are proposed for
listing; (3) on List LB (considered endangered throughout its range) or List 2 (considered
endangered in California but more common elsewhere) of the CNPS Inventory of Rare
and Endangered Vascular Plants of California (CNPS 2001); or (4) considered rare,
endangered, or threatened by the NDDB (State of California 2002), or local conservation
organizations or specialists. Noteworthy plant species are considered tobe those that are
on List 3 (more information about the plant's distribution ard rarity needed) and List 4
(plants of limited distribution) of the CNPS Inventory. Sensitive habitat types are those
identified by 'the California Natural Diversity Data Base (Holland 1986) or identified by
the City of Carlsbad's MHCP Subarea Plan (1999).
I
F MHCP covered species are those species which will be included in the Incidental Take
Authorization issued to the City of Carlsbad by the federal and state government as part
of the Citys MHCP Habitat Management Plan. The term "non-covered species" is
sometimes used to identify species not included in the Incidental Take Authorization.
Mitigation procedures and protection of covered species depends on the location of the
project site (i.e., within or outside a core preserve area) and the nature of project impacts, " State and federal agencies regulate non-covered sensitive species.
All jurisdictional waters, including wetlands and • non-wetland waters, are considered
sensitive by local, state, and federal agencies. Jurisdictional waters are regulated at the
state and federal levels through the Fish and Game Code and the Clean Water Act,
respectively. Avoidance of impacts to jurisdictional waters is recommended. Unavoidable
impacts require mitigation to satisfy the no-net-loss policies of the resource agencies.
# Raptors (birds of prey) and raptor nests are protected by the California Fish and Game
code 3503.5, which states that it is "unlawful to take, possess, or destroy any birds of
prey or to take, possess, or destroy the nest or eggs of any such bird" unless authorized.
'V 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. --
Wetlands/Jurisdictional Areas
A wetland delineation study was conducted on this segment of Agua Hedionda Creek
(RECON 2002). The creek supports herbaceous wetlands on the low sandbars during the
low flow dry season. These wetlands are temporarily disturbed each year during the wet
season by flood flows from local storm events. The banks of the creek are considered
riparian. A total of 3.8 acres of U.S. Army Corps of Engineers defined wetland and
0.4 acre of non-wetland jurisdictional waters occurs along this section of the creek. The
California Department of Fish and Game jurisdiction on the site includes the 4.2 acres of
wetland/non-wetland waters plus 2.5 acres of riparian creek bank.
Sensitive Plant Species Observed
No federal or state listed endangered or threatened plant species were observed or are
expected to occur within the project limits.
Sensitive Uabitat Observed :........
The herbaceous wetlands of the creek channel bed are considered a sensitive habitat type.
However, the functional values of this habitat type is not considered high due to the lack
of community structure (i.e., tree and shrub layers), limited species diversity, and
frequency of disturbance (i.e., floods).
Sensitive Wildlife Species Detected On-Site
No federal and state listed wildlife species were observed within the project site. The
white-tailed kite, a California fully protected species, and sharp-shinned hawk, a
California species of special concern, were observed during the survey. These species
are discussed below.
White-tailed kite (Elanus leucurus). White-tailed kites range throughout the coastal
areas of Oregon, California, and northern Baja California, Mexico, and are known from
further south in Mexico and South America. This species primarily breeds in riparian
areas lined with willow, cottonwoods or sycamores, but also uses savannas, marsh, and
grassy foothills. They are commonly observed foraging over grassland, sparse shrubs, or
agricultural fields. The white-tailed kite is a California fully protected species.
A white-tailed kite was observed perching in a tree on the banks of the creek. This
species likely forages in the nearby agricultural fields and nests in nearby native riparian
habitats.
Sharp-shinned hawk (Accipiter striatus). Sharp-shinned hawks can be found throughout
most of North America south to Central America. Their primary habitats are woodlands
and mountainous coniferous and deciduous forests. Locally, they can be found foraging.
in woodland habitats associated with riparian areas, such as willow and sycamore
woodlands. Although they have not been documented to nest in San Diego County, there
is suitable habitat within the county (Unitt .1984). This species is a California species of
special concern.
A sharp-shinned hawk was observed with a small bird in its talons along Agua Hedionda
Creek. This species is likely to use the channel for foraging but not nesting.
Sensitive Wildlife Species with the Potential to Occur On-Site
Sensitive species not observed but with the potential to occur are described below. These
species include least Bell's vireo, Cooper's hawk, southwestern willow flycatcher, and
arroyo toad (Bufo californicus). These species are discussed below.
Least Bell's vireo (Vireo beilli pusillus). Least Bell's vireo is a small, migratory
songbird which breeds in southern California and winters in Baja California. This species
breeds in dense riparian habitats with willows (Salix spp.) or western sycamores forming
a canopy and an understory comprised of mule fat (Baccharis salicifolia), wild rose
(Rosa californica), and other riparian species. This species is a. state and federally listed
endangered species and a MSCP covered species.
10
Habitat for the least Bell's vireo does not occur along this section of Agua Hedionda
Creek. Therefore, no directed surveys for the species were conducted. The least Belt's
vireo has known locations downstream of the project within native riparian habitat where
Agua Hedionda Creek merges with the upper Agua Hedionda Lagoon habitats.
Cooper's
hawk (Accipiter cooperii). The Cooper's hawk is a medium-sized raptor that
ranges throughout most of the United States. It is considered an uncommon resident
during the breeding season in southern California, with numbers increasing in winter.
(Garrett and Dunn 1981). This hawk mainly breeds in oak and willow riparian woodlands
but will also use eucalyptus trees (Unitt 1984). This hawk forages primarily on songbirds
but is also known to eat small mammals. The decline of this species has been caused by
urbanization and loss of.. habitat. The Cooper's hawk is a CDFG species of special
concern and an MSCP covered species.
No Cooper's hawks were observed during surveys. This species has a moderate potential
to forage and roost within the non-native trees of the RCMHP.
Southwestern willow flycatcher (Empidonar traillii extimus). The southwestern willow
flycatcher is a federally listed endangered species. This species breeds in southern
California, Arizona, New Mexico, southern Nevada, southern Utah, western Texas,
northwestern Mexico, and possibly southwestern Colorado (50 CRF 17 July 23, 1993).
Southwestern willow flycatchers are migrants, arriving on their breeding grounds in mid-
May to early June (Garrett and Dunn 1981, Unitt 1984).
The southwestern willow flycatcher requires riparian habitat with dense willow (Salix
spp.) thickets (Grinnell and Miller 1944). Understory species include Baccharis and
Pluchea. Southwestern willow flycatchers also nest in areas with tamarisk (Tanzarix spp.)
and Russian olive (Elea gnus angust(folia) in areas where these species have replaced the
native willow. Surface water is required at nesting sites (Tibbitts et at. 1994, 50 CRF 17
July 23, 1993).
Habitat suitable to support southwestern willow flycatchers was not observed within the
project area; therefore, no directed surveys for this species were conducted. No locations
of this flycatcher species are known in the vicinity of the project.
Arroyo toad (Bufo californicus). U.S. Fish and Wildlife Service (USFWS) listed the
arroyo toad as an endangered species on December 16, 1994. On July 24, 1999, the
USFWS issued a Recovery Plan describing strategies to achieve downlisting to
threatened status (with 20 self-sustaining populations) and delisting (with 35 populations
throughout its historical range). On June 8, 2000, the USFWS proposed the designation
of critical habitat for the species. The arroyo toad ranges along the coast from San Luis
Obispo County south into northwestern Baja California and is known from six drainages
in the desert. Arroyo toads have been found in the basins formed by San Juan Creek
(Orange County), San Mateo Creek (Orange and San Diego Counties), San Onofre
Creek, Santa Margarita River, San Luis Rey River, San Dieguito River, San Diego River,
Sweetwater River, Otay River, San Felipe Creek, Vallecitos Creek, and the Tijuana River
in San Diego County (USFWS 1999).
The arroyo toad has very specific habitat requirements. It inhabits sandy banks of washes,
streams, and arroyos with low currents and large, deciduous trees. Arroyo toads breed in
pools with the majority of the pool greater than one foot deep with a substrate of sand,
gravel, or pebbles. The pools tend to lack vegetation (Sweet 1992). Arroyo toads are
nocturnal and breed from March to June depending on local climate. Females lay
between 2,000 and 10,000 eggs in strings in the breeding pools. Larvae metamorphose in
65 to 85 days. Adult toads estivate through during the summer in burrows that they dig
on sandbars (Jennings and Hayes 1994).
This species is unlikely to occur because the site lacks suitable stream habitat and the
level of disturbance is high.
Raptors. The mature trees along the banks of the creek provide habitat for roosting,
nesting, and foraging for a variety of raptor species. Although no nests were observed
during surveys, any of the following species have potential to nest within these areas:
red-shouldered hawk, white-tailed kite, Cooper's hawk, sharp-shinned hawk,; and red-
tailed hawk.
6. Wildlife Movement Corridors
Wildlife movement corridors are defined as areas that connect suitable wildlife habitat
areas in a region otherwise fragmented by rugged terrain, changes in vegetation, or
human disturbance. Natural features such as canyon drainages, ridgelines,. or areas with
vegetation cover provide corridors for wildlife travel. Wildlife movement corridors are
important because they provide access to mates, food, and water; allow the dispersal of
individuals away from high population density areas; and facilitate the exchange of
genetic traits between populations. Wildlife movement corridors are considered sensitive IC
by the City of Carlsbad and resource and conservation agencies.
Agua Hedionda Creek functions as a moderate quality movement corridor for numerous
wildlife species such as birds, coyotes, skunks, opossums, and raccoons. The creek links
open space areas located upstream of the RCMHP to Agua Hedionda Lagoon located
downstream of El Camino Real. There is a bridge overcrossing of Agua Hedionda Creek
at El Camino Real that has sufficient height to allow mammal species to go under.
12
E. Multiple Habitat Conservation Program
The MFICP "core preserve areas" are those lands that have been included within the City
of Carlsbad's Subarea Plan for habitat Conservation. These areas have been determined to
provide the necessary habitat quantity, quality, and connectivity to support the future
viability of San Diego County's unique biodiversity and thus are considered to be a
I sensitive biological resource. The City of Carlsbad has prepared a draft Habitat
Management. Plan (HMP) as a subarea plan to the North County MHCP in San Diego.
County, California (City of Carlsbad 1999). The HMP describes conservation goals
: within the city, including preserve planning areas for cores, linkages, and special resource
:4 areas. The project Site is not within the HMP core preserve area. However, local staff of
the Natural Community Conservation Program (NCCP) of the California Department of
4 Fish and Game are interested in maintaining the wildlife corridors along Agua Hedionda
Creeks as much as possible.
Project Impacts
Direct, temporary impacts would occur on Agua Hedionda Creek from sediment removal
within RCMHP. Anticipated biological impacts for this project were assessed according
to guidelines set forth in the City of Carlsbad's HMP, CEQA, and NEPA. Mitigation
would .be required for impacts that are considered significant under these guidelines.
Plant Community Impacts
No native vegetation communities would be impacted by the channel maintenance.
Channel maintenance within the RCMHP would remove up to 30,000 cubic yards of
excess sediments from the creek. Approximately 3.7 acres of herbaceous wetlands,
0.5 acre of riparian creek bank, and 0.1 acre of developed land would be temporarily
affected during the project. Once sediment removal is completed, it is anticipated that
these herbaceous wetlands will re-colonize the new sandbars of the creek over time. The
temporary impact to herbaceous wetlands and the riparian banks would, however, be
considered significant.
Non-Sensitive Wildlife Impacts
Small mammals and reptiles with low mobility may be inadvertently killed during
- grading of the site. These potential impacts to general wildlife species would not be
.Ii considered significant.
13
C. Sensitive Biological Resources Impacts
1. Wetlands/Jurisdictional Waters
The removal of accumulated sediment from Agua Hedionda Creek within the RCMHP
would be considered a temporary impact to jurisdictional waters. Since the sediment
removal from the creek would not permanently fill any jurisdictional waters, there would
be a no net loss of channel or wetland. It is anticipated that a net gain in the jurisdictional
area will result from the project due to channel widening at the confluence of Agua
Hedionda and Calavera Creeks.
1 2. Sensitive Plants
No impacts to any sensitive plant species are anticipated from the proposed project.
Sensitive Wildlife
No impacts to any sensitive wildlife species are anticipated from the proposed project. If
raptors nest in any of the trees along the banks of the creek, then impacts to these trees
would be considered significant if the tree is removed during the breeding season.
Sensitive Plant Communities
Although no native plant communities occur on the site, temporary impacts to 4.2 acres
of riparian habitat comprised of 3.8 acres of herbaceous wetlands and 0.4 acre of riparian
creek bank would be considered significant.
I Wildlife Movement Corridor
Construction activities within the creek channel will be temporary and will not :4 permanently impact existing wildlife movement along the creek. Therefore, these impacts
are not considered significant.
Mitigation Measures and Recommendations
The following mitigation measures are recommended to reduce impacts to a level below
significance:
L. Mitigation for temporary impacts to herbaceous wetlands and the banks of Agua
Hedionda Creek will be accomplished by the planting of native riparian trees
along the newly manufactured banks of the creek. Plant species installed on the
banks could include coast live oak (Quercus agrfoIia), black willow (Salix
14
gooddingii), western sycamore (Piatanus racemosa), and Fremont cottonwood
(Pbpulusfremontii).
Prior to the removal of any trees from the banks of the creek a survey should be
conducted by a qualified biologist to ensure that active nests of any raptor species
are not present. If an active raptor nest is present than the removal of that tree and
trees within 100 feet cannot occur until the young have fledged.
Prior to impacts occurring to Agua Hedionda Creek, a 404 permit from the U.S.
Army Corps of Engineers, a 401 State Water Quality Certification from the
Regional Water Quality Control Board, and a 1601 .Streambed Alteration
I Agreement must be obtained that authorizes impacts to jurisdictional waters on
the site, including wetlands.
References Cited
American Ornithologists' Union
1998 Check-list of North American Birds. 6th ed. Washington, D.C., with Supple-
ments in 1985, 1987, 1989, 1991, 1993, and 1995.
Brown, C.
1995 Drainages with Extant Arroyo Toad Populations. Unpublished data.
California Native Plant Society
2001 Inventory of Rare and Endangered Plants of California (6th ed.). Rare Plant
Scientific Advisory Committee, David P. Tibor, Convening Editor. California
Native Plant Society. Sacramento CA.
California, State of
2002a Special Animals. Natural Diversity Data Base. Department of Fish and Game.
January.
2002b Special Plants List. Natural Diversity Data Base. Department of Fish and
Game. January.
Carlsbad, City of
1999 Habitat Management plan for. Natural Communities in the City of Carlsbad.
December 1999.
Collins, Joseph T.
I . 1990 Standard Common and
Amphibians and Reptiles.
u
Current Scienlifie Names fin-
3rd ed. lkrpeiologicat Circular Nc
North 4mrru-an
,. 19.s(WICIVIot
the Study of Amphibians and Reptiles, Department of Zoology, Miami
University, Oxford, Ohio.
Garrett, Kimball, and J. Dunn
1981 Birds of Southern California. Artisan Press, Los Angeles.
Grinnell, J., and A. Miller
1944 The Distribution of the Birds of California. Pacific Coast Av[auna 26:608.
Hickman, James C. (editor)
1993 The Jepson Manual: Higher Plants of California University of California
Press, Berkeley and Los Angeles.
Holland, Robert F.
1986 Preliminary Descriptions of the Terrestrial Natural Communities of California.
Nongame-Heritage Program, California Department of Fish and Game.
October.
Jennings, M. R., and M. P. Hayes
1994 Amphibian and Reptile Species of Special Concern in California. California
Department of Fish and Game. Rancho Cordova, California.
Jones, J. K., D. C. Carter, H. H. Gangways, R. S. Hoffman, and D. W. Rice
1982 Revised Checklist of North American Mammals North of Mexico. Occasional
Papers of the Museum, Texas Tech University 80:1-22.
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.
Sloan, A. J.
1964 Amphibians of San Diego County. Occasional Papers of the San Diego Society
of Natural History No. 13.
Sweet, S.
1992 Initial Report on the Ecology and Status of the Arroyo Toad Fisi
microscaphus californicus) on the Los Padres National Forest oF Souilkrn
California, with Management Recommendations. Contract Reinrl it,. U.N.
Department of Agriculture, Forest Service, Los Padres National Fo,cM. (okl;t.
California. Revised March.
I
Tibbitts, T. J., M. K. Sogge, and S. J. Sferra
1994 A Survey Protocol for the Southwestern Willow Flycatcher (Einpidonax trailiii
extimus). Tech. Rep. NPS/NAUCPRSINRTR-94/04; U.S. Dept. mt., National # Park Service, Colorado Plateau Res. Sta., Flagstaff, Arizona.
Unitt, P. A.
1984 Birds of San Diego County. Memoir No. 13, San Diego Society of Natural
History.
U.S. Department of Agriculture
1973 Soil Survey, San Diego Area, California. Soil Conservation Service and Forest
Service. Roy H. Bowman, ed. San Diego. December.
T.
17
ATTACHMENTS
ATTACHMENT 1
t
- (i••law 4Mb
ATTACHMENT 1
PLANT SPECIES OBSERVED
Scientific Name Common Name Origin
Agave americana Century plant I
Anagallis arvensis L. Scarlet pimpernel, poor-man's weatherglass I
Apium graveolens L. Celery I
Artemisia douglasianã Mugwort N
Arundo donax L. Giant reed I
Atriplex triangularis Wild. Spearscale N
Anemopsis cal(fornica (Nutt.) Hook. & Am. Yerba mansa N
Baccharis salicifolia (Ruiz Lopez & Pavón) Pers. Mule fat, seep-willow N
Brassica nigra (L.) Koch. Black mustard I
Carex spissa Bailey San Diego sedge N
Carpobrotus edulis (L.) Bolus. Hottentot fig I
Chenopodium ambrosioides L. Mexican tea I
Cotula coronopjfoiia L. Brass-buttons I
Cynodon dacrylon (L.) Pers. Bermuda grass I
Cyperus sp. Nutsedge N
Eleocharis nzontevidensis Kunth Slender creeping spikerush N
Eucalyptus spp. Eucalyptus I
Foeniculuni vulgare Mill. Fennel I
Gazania sp. African daisy I
Hedera helix L. English ivy I
Heliotropiurn curassavicum L. Chinese pusley N
Heteromeles arbut4folia (Lindley) Roemer Toyon, Christmas berry N
Juncus sp. Rush N
Juiicusniexicanus Wild. Mexican rush N
Malosma laurina (Nun.) Abrams Laurel sumac N
Melilolus indica (L.) All. Sourclover I
Myoporurn lae:um Forst. Myoporum I
Neriu,n oleander L. Oleander I
Olea europeae L. Common olive I
Phoenix canariensis Chabaud. Canary Island date palm I
Picris echioides L. Bristly ox-tongue I
Pinus sp. Pine I
Plantago major L. Common plantain I
Polypogon monspeliensis (L.) Desf. Annual beard grass I
ATTACHMENT 1
PLANT SPECIES OBSERVED
(continued)
Scientific Name Common Name' Origin
Pyracaniha sp. Firethorn I
Rorippa nasturtium-aqaricum (L.) Hayek Water cress I
Rumex crispus L. 41 Curly dock I
Salix 1aevigata Bebb Red willow N.
Salix Iasio1epis Benth. Arroyo willow N
Schinus nzo11e L. .
Peruvian pepper tree I
Schinus terebinthifoiius Raddi Brazilian pepper tree I
Veronica anagallis-aquatica L. Water speedwell . I
Vitis girdiana Munson Desert wild grape N
Was1üng:onia robusta Wendl. Washington palm I
Xanthiurn struniarium L. . Cocklebur N
N = . Native to locality
I = Introduced species from outside locality
-
ATTACHMENT 2
I I
0
I
9
I'
ATTACHMENT 2
WILDLIFE SPECIES OBSERVED/DETECTED ON
THE SITE
Occupied
Common Name Scientific Name Habitat Status
Reptiles (Nomenclature from Collins 1997)
Side-blotched lizard Uta stansburiana B
Birds (Nomenclature from American Ornithologists' Union)
White-tailed (= black-shouldered) kite
Sharp-shinned hawk
Red-shouldered hawk
Mallard
Mourning dove
Anna's hummingbird
Nuttall's woodpecker
Black phoebe
Common raven
Northern mockingbird
Wrentit
House finch
Lazuli bunting
California towhee
Song sparrow
Elan us leucurus
Accipiler striatus velox
Buteo lineatus elegans
Anas platyrhynchos platyrhynchos
Zenaida macroura marginella
Calypte anna
Dendrocopos nuttallui
Scyornis nigricans semiatra
Corvus corax clarionensis
Mimas polyglottos Polyglot=
Chaniaeafasciata henshawi
Carpodacus mexicanusfroivalis
Posserina amoena
Pipilo crissalis
Melospiza melodia
B
C
0
C
B,C
B.0
B
B,C
B
B,C
B
B,C
B
B
B
CFP,*
CSC
Mammals (Nomenclature from Jones etal. 1982)
California ground squirrel Spermophilus beecheyl B,C
Cottontail rabbit Sylvilagus audubonii B
Habitats
C = Channel
B = Banks of creek
O =Open
Status
CFP = California fully protected species
FE = Listed as endangered by the federal government
MSCP = Multiple Species Conservation Program target species list
SE = Listed as endangered by the state of California
* = Taxa listed with an asterisk fall into one or more of the following categories:
Taxa considered endangered or rare undçr Section 15380(d) of CEQA guidelines
Taxa that are biologically rare, very restricted in distribution, or declining thràughout 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)
SUPPLEMENTAL BIOLOGICAL
RESOURCES INFORMATION
Defmition of Term
for Plants and Animals
Within the Carlsbad Study Area
Plants
Blochman 'S Dudleya (Dudleya blochmaniae ssp. blochmaniae) is a perennial herb that
blooms between April and June. It is found in coast bluff scrub, chaparral, coastal scrub,
valley and foothill grassland habitats and on rocky, often clay or serpentinite soils between
15 and 1500 feet elevation.
- Cljffspurge (Euphorbia misera) is a shrub that blooms between December and August. It is
found in rocky areas in coastal bluff scrub and coastal scrub habitats between 30-1650 feet
elevation.
Nuttall 's scrub oak (Quercus dumosa) is an evergreen shrub that blooms between February
and April. It is found in closed cone coniferous forests, chaparral, and coastal scrub habitats
on sandy and clay loam soils between 50-1300 feet elevation.
Orcutt's spinefiower (Chorizanthe orcuttiana) is an annual herb that blooms between March
and April. It is found in openings in coastal chaparral with undisturbed loose sandy soil.
Orcutt 's hazardia (Hazardia orcuttii) is an evergreen shrub that is found in open chamise
chaparral near Encinitas.
Animals
American peregrine falcon (Falco peregrinus anatum) nests on cliff edges, buildings,
cranes, and nests. They feed along the coast, or inland near lakes and reservoirs..
Belding 's savannah sparrow (Passerculus sandwichensis belding) is locally common in
open grassy or weedy areas throughout San Diego County.
California brown pelican (Pelecanus occidentalis caljfornicus) nesting colony nearest to
San Diego County is on the Los Coronados Islands off Tijuana. These birds are common
along the coast where they dive for fish. They are known to congregate in areas that provide
secure roost sites such as coastal bluffs, or man-made structures near fertile fishing grounds.
California least tern (Sterna antillarum browni) is a ground nesting bird that requires
undisturbed stretches of beach and coastline. Adults are highly philopatric to natal colonies,
and forage in bays and estuaries near their colonies.
Coastal California gnatcatcher (Polioptila californica californica) can be found in Diegan
coastal sage scrub dominated by California sagebrush (Artemisia californica) and flat-
topped buckwheat (Eriogonum fasciculatum) below 1000 feet elevation along the coastal
slope. It generally avoids steep slopes above 25 percent and prefers dense, tall vegetation
for nesting.
Cooper's hawk (Accipiter cooperiV can usually be found in oak woodlands, but occasionally
in willow or eucalyptus woodlands.
Elegant tern (Sterna elegans) is intensely gregarious. They nest in five known colonies in
southern California. They feed on off shore fish, principally anchovies.
Least Bell's vireo (Vireo bellii pusillus) is found in riparian woodland habitat with an
understory of dense young willows or mulefat and willow canopy. The nests are often
placed along internal or external edges of riparian thickets.
Light-footed clapper rail (Rallus longirostris 1ev4,es) is found in southern California in
coastal salt marshes, especially those dominated by cordgrass. The Tijuana River estuary is
an especially important site.
Orange-throated whzptail (Cnemidophorus hyperythrus beldingi) is found in sage scrub
habitat that covers about 50 percent of the ground without dense grasses in between. It can
also be found in dense to extremely open stands of sage as well as chamise chaparral and
floodplain areas.
Southern California rufous-crowned sparrow (Aimophila ruficeps) is found mainly in
coastal sage scrub on grassy or rocky slopes with open scrub at elevations from sea level to
2000 feet.
Southwestern willow flycatcher (Empidonax traillii extimus) is restricted to a few colonies in
riparian woodlands scattered throughout southern California. Riparian forests are integral to
this species persistence.
Western snowy plover (Charadrius alexandrinus nivosus) nests on beaches, dunes, and salt
flats. Outside the breeding season they are more widespread but not common along the
county's coast.
White-faced ibis (Plegadis chihi) is found in shallow areas of freshwater marshes and wet
grass. They are colonial nesters, with two known colonies in San Diego County, along
Guajome Lake and near a pond in San Luis Rey River valley.
Yellow-breasted chat (Icteria virens) can be found in riparian woodland, with dense
undergrowth.
Wildlife Species Observed during Surveys or
have the Potential to Occur within the Project Vicinity for
Project Components B, BN and BJB
Common Name Scientific Name Observed
Potential
to Occur
Amphibians
Pacific tree frog Hyla regilla
California frog Hyla cadaverina
bullfrog Rana catesbeiana
Arroyo toad Bufo californicus
Reptiles
side-blotched lizard Uta stanburiana
western fence lizard Scelporus occidental is
alligator lizard Elgaria multicarinala webbi
California kingsnake Lampropeltis getulus caljforniae
two-striped garter snake Tahmnophis hammondii
Birds
mourning dove Zenaida macro ura marginella
Anna's hummingbird Calypte anna
Nuttall's woodpecker Dendrocopos nuitallii
black phoebe Sayornis nigricans semiatra
house finch Carpdacus mexicanusfrontalis
mallard Anas plalyrhynchos
sharp-shinned hawk Accipiter striatus velox
white-tailed kite Elanur leucurus
least Bell's vireo Vireo bellii pusillus
southwestern willow flycatcher Empidonax iraillii extimus
yellow warbler Dendroica pelechia
yellow-breasted chat Icteria virens auricollis
western scrub-jay Aphelocoma californica
wren-tit Chamaeafasciata henshawi
lesser goldfinch Carduelis psaltria hesperophilus
Pacific slope flycatcher Empidonax djflIcilis
bushtit Psaltriparus minimus
orange-crowned warbler Vermivora celata
common yellowthroat Geothlypis trichas
spotted towhee Pipiia maculates
European starling Sturnus vulagris
Cooper's hawk Accipiter cooperii
brown-headed cowbird Molothrus ater
red-shouldered hawk Buteo lineatus
red-tailed hawk Buteojamaicensis
Mammals
California ground squirrel Spermophilus beecheyi
cottontail rabbit Sylvilagus audubonii
raccoon Procyon lotor
striped skunk Mephitis mephitis
San Diego black-tailed jackrabbit Lepus californicus bennettii
coyote Canis latrans