San Dimas City Council
December 10, 2024

San Dimas Municipal Code Text Amendment
(20-0005)
TABLE 4

SPECIAL STATUS PLANT SPECIES REPORTED FROM THE

PROJECT REGION
Federal
Status
State
Species Common Status
Name
CRPR Habitat* Potential to
Alkaline or serpentinite Occur
soils in
woodland, coastal chaparral, cismontane
scrub,
marshes and swamps,
and
meadows and seeps
between
80 and 7,630 feet above
msl.

Not expected to
occur; no
suitable soils.

Muhlenbergia
utilis
aparejo
grass
—
—
—
—
2B.2
Mesic areas of coastal
scrub,
meadows and seeps,
alkaline
valley and foothill
grassland,
and vernal pools
between 10
and 3,970 feet above
msl.
prostrate vernal
pool
navarretia
Not expected to
occur; no
suitable habitat.

Navarretia
prostrata
Oreonana vestita
1B.2
1B.3
Gravelly or talus
substrate in
lower montane
coniferous
forest, subalpine
coniferous
forest, and upper
montane
coniferous forest
between
5,300 and 11,485 feet
above
msl.

Not expected to occur;
no
suitable habitat;
outside
current known
geographic
and elevation range.
woolly mountainparsley— —
Meadows and seeps
between
165 and 2,000 feet above
msl.

Not expected to occur;
no
suitable habitat;
outside
current known
geographic
range.

Pelazoneuron puberulum
var.
sonorense
Sonoran maiden
fern
Hubby’s phacelia
—
—
—
—
2B.2

4.2 Open gravelly, talus, or
rocky
slopes of chaparral,
coastal
scrub, and valley and
foothill
grassland between sea
level
and 3,280 feet above
msl.

May occur; suitable
habitat;
historically reported
less
than one half mile to
the
southeast (CCH
2023)
Phacelia
hubbyi
Rocky or sandy soil in
chaparral, coastal
dunes,
coastal scrub, and
coastal salt
marshes and swamps
between 15 and 985
feet
above msl.

May occur; suitable
habitat;
reported
approximately
eight miles to the
northeast
(CCH 2023).

Phacelia ramosissima
var.
austrolitoralis
south coast
branching
phacelia
—
—
—
—

3.2 Coastal dunes and
coastal
scrub between 5 and
1,310
feet above msl.

May occur; suitable
habitat;
historically reported
approximately nine
miles to
the west (CCH
2023).

Phacelia
stellaris
Brand’s star
phacelia
1B.1
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43 Biological Technical
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San Dimas Municipal Code Text Amendment
(20-0005)
TABLE 4

SPECIAL STATUS PLANT SPECIES REPORTED FROM THE

PROJECT REGION
Federal
Status
State
Species Common Status
Name
CRPR Habitat* Potential to
Sandy or gravelly areas Occur
of
riparian woodland,
cismontane woodland,
coastal
scrub, and chaparral
between
sea level and 6,890
feet
above msl.

May occur; suitable
habitat;
historically reported
approximately six
miles to
the northeast (CCH
2023).

Pseudognaphali
um
leucocephalum
white rabbittobacco—
—
—
—
—
—
2B.2
Chaparral and
cismontane
woodland between 1,475
and
3,280 feet above msl.

Perennial species
observable
year-round.

Not expected to
occur; no
suitable habitat;
outside
current known
elevation
range.

Quercus durata
var.
gabrielensis
San Gabriel
oak
Engelmann
oak

4.2 4.2
Chaparral,
cismontane
woodland, riparian
woodland,
valley and foothill
grassland
between 165 and 4,265
feet
above msl. Perennial
species
observable yearround.

Limited potential to
occur;
suitable habitat;
nearest
recent record is from
Bonelli
Regional Park to the
east
(CCH 2023)..

Quercus
engelmannii
Romneya coulteri
Chaparral and coastal
scrub,
often in burns, between
65 and 3,935 feet above
msl.

Perennial species
observable
year-round.

Limited potential to
occur;
suitable habitat;
nearest
recent record is
approximately 7.5
miles
northeast in Ontario
(CCH
2023).

Coulter’s matilija
poppy
— — 4.2
Shallow freshwater
marshes
and swamps between
sea
level and 2,135 feet
above
msl.

Not expected to
occur; no
suitable habitat.

Sagittaria
sanfordii
Senecio
aphanactis
Sanford’s
arrowhead
chaparral ragwort
—
—
—
—
1B.2
2B.2
Drying alkaline flats
of
chaparral,
cismontane
woodland, coastal
scrub
between 50 and 2,625
feet
above msl.

Not expected to
occur; no
suitable soils.

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San Dimas Municipal Code Text Amendment
(20-0005)
TABLE 4

SPECIAL STATUS PLANT SPECIES REPORTED FROM THE

PROJECT REGION
Federal
Status
State
Species Common Status
Name
CRPR Habitat* Potential to
Rocky slopes in chaparral Occur
and
coastal bluff scrub
between
1,310 and 4,920 feet
above
msl.

Not expected to occur;
no
suitable habitat;
outside
current known
geographic
and elevation range.

Senecio
astephanus
San Gabriel
ragwort
—
—
—
—
—
—

4.3 Alkali springs and
marshes in
playas, chaparral,
coastal
scrub, lower montane
coniferous forest, and
Mojavean desert
scrub
between 50 and 5,020
feet
above msl.

Not expected to
occur; no
suitable habitat.

Sidalcea
neomexicana
salt spring
checkerbloom
chickweed oxytheca
2B.2

4.3 Sandy soils in lower
montane
coniferous forest
between
3,655 and 8,530 feet
above
msl.

Not expected to occur;
no
suitable habitat;
outside
current known
geographic
and elevation range.

Sidotheca
caryophylloides
Disturbed areas,
vernally
mesic grassland, or
near
ditches, streams, and
springs
in meadows and
seeps,
May occur; suitable
cismontane woodland, coastal reported habitat;
approximately 4.5 Symphyotrichum
defoliatum
San Bernardino
aster
— — 1B.2 scrub, lower montane
coniferous forest,
marshes
and swamps, valley
and
foothill grassland
between 5
and 6,695 feet above
msl.
miles to the east
(CCH
2023).

Mesic areas of broadleafed
upland forest,
chaparral,
cismontane woodland,
lower
montane coniferous
forest,
and riparian
woodland
between 985 and 6,595
feet
above msl.

Not expected to occur;
no
suitable habitat;
outside
current known
geographic
range.

Symphyotrichum
greatae
Greata’s
aster
— — 1B.3
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San Dimas Municipal Code Text Amendment
(20-0005)
TABLE 4

SPECIAL STATUS PLANT SPECIES REPORTED FROM THE

PROJECT REGION
Federal
Status
State
Species Common Status
Name
CRPR Habitat* Potential to
Dry, rocky slopes of Occur
pinyon
and juniper woodland
between 1,970 and 7,220
feet
above msl.

Not expected to occur;
no
suitable habitat;
outside
current known
geographic
and elevation range.

Thysanocarpus
rigidus
rigid
fringepod
— — 1B.2
CRPR: California Rare Plant Rank; msl: mean
sea level. LEGEND:

Federal
(USFWS)
State
(CDFW)
FE
FT
Endangered
Threatened
SE
SR
Endangere
d
CRPR Rare
1A
1B
2B
3 Plants presumed extirpated in California and either rare or extinct elsewhere
Plants Rare, Threatened, or Endangered in California and elsewhere
Plants Rare, Threatened, or Endangered in California but more common elsewhere
Plants about which we need more information – A Review List Plants of limited distribution – A Watch List
4 CRPR Threat Code
Extensions None
.1
Plants lacking any threat information
Seriously threatened in California (over 80% of occurrences threatened; high degree .2 and immediacy of threat) Fairly threatened in California (20–80% of occurrences threatened; moderate degree .3 and immediacy of threat) Not very threatened in California (<20% of occurrences threatened; low degree and immediacy of threat or no current threats known) Species that were observed on site are shown in boldface type. * Sources include CDFW 2023a, CNPS 2023a, and Jepson Flora Project 2023.

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San Dimas Municipal Code Text Amendment
(20-0005)

3.7.1 Thread-leaved
Brodiaea
Thread-leaved brodiaea (Brodiaea filifolia) is a federally Threatened species, a State Endangered
species, and a CRPR 1B.1 species. It typically blooms between March and June (CNPS 2023a).

This perennial bulbiferous herb often occurs in clay soil in chaparral openings, cismontane
woodland, coastal scrub, playas, valley and foothill grassland, and vernal pools between 80 and
3,675 feet above msl (CNPS 2023a). This species is known from the south coast (Los Angeles
and San Diego Counties), the San Bernardino mountains, and the western Peninsular Ranges
(Orange, Riverside, and San Diego Counties) (Jepson Flora Project 2023).

It is threatened by
residential development, agriculture, foot traffic, grazing, illegal dumping, non-native plants, and
vehicles (CNPS 2023). This species has been reported approximately five miles to the north
(CCH 2023).

The general surveys were not timed to identify thread-leaved brodiaea in the BSA. The 2023
surveys were performed in July (after mowing was performed) and the earliest 2022 survey was
performed on June 30, 2022, which is at the end of the blooming period.

Focused surveys would
be needed to determine the presence or absence of this species in the BSA. Thread-leaved
brodiaea has potential to occur in coastal sage scrub and limited potential to occur in non-native
herbaceous vegetation in the BSA.

3.7.2 Nevin’s
Barberry
Nevin’s barberry (Berberis nevinii) is a federally and State Endangered species and a CRPR 1B.1
species. It is a perennial shrub that is observable year-round. This species occurs in gravelly or
sandy soils in chaparral, coastal sage scrub, cismontane woodland, and riparian woodland from
230 to 2,705 feet above msl (CNPS 2023a). This species is known from Los Angeles, Riverside,
San Bernardino, and San Diego Counties. It is threatened by alteration of fire regimes,
development, and road maintenance (CNPS 2023a). This species has been reported
approximately eight miles to the east (CCH 2023).

While this species would have been observable during the general surveys, much of the general
surveys were conducted from overlooks; surveys did not visually cover 100 percent of the BSA.

Focused surveys would be needed to determine the presence or absence of this species in the
BSA. Nevin’s barberry has potential to occur in coastal sage scrub, chaparral and native
woodlands and has a limited potential to occur in non-native woodlands in the BSA.

3.7.3 Southern California Black
Walnut
Southern California black walnut is a CRPR 1B.1 species. It is a perennial tree that is observable
year-round. It typically blooms between March and August (CNPS 2023a).

This species occurs
on hillsides and in canyons, chaparral, cismontane woodland, coastal scrub, and riparian
woodland between 165 and 2,955 feet above msl (Jepson Flora Project 2023; CNPS 2023a). This
species is known from the outer South Coast Ranges, the South Coast, the western Transverse
Ranges, the San Gabriel Mountains, the Peninsular Ranges, and the San Jacinto Mountains
(Jepson Flora Project 2023). Walnut forests are a fragmented, rare, and declining vegetation
community threatened by urbanization, grazing, non-native plants, possibly by lack of natural
reproduction and hybridization with horticultural varieties of walnut (CNPS 2023a).

Southern California black walnut trees were observed throughout the BSA.

They are primarily
located in areas mapped as California walnut groves and California walnut groves (disturbed)
(Figure 6). A formal tree survey to inventory individual trees was not performed.

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San Dimas Municipal Code Text Amendment
(20-0005)

3.7.4 Protected
Trees
Multiple trees within the BSA would meet the definition of a “mature significant tree” pursuant to
the City of San Dimas Municipal Code (Chapter 18.162 – Tree Preservation).

This would include
coast live oak, southern California black walnut, and any other tree meeting the trunk diameter
requirement (including non-native species). A mature significant tree is defined as any tree within
the oak genus which measures 8 inches or more in trunk diameter and/or any other species of
trees which measure 10 inches or more in trunk diameter and/or a multitrunk tree(s) having a total circumference of 38 inches or more; the multi-trunk tree shall include at least one trunk with
a diameter of a minimum of 4 inches.

The following trees are
excluded:
 trees planted, grown, and/or held for sale by licensed nurseries and/or tree farms or the
removal or transplanting of such trees pursuant to the operation of licensed nursery and/or
tree farm; 



trees within existing or proposed public right-of-way where their removal or relocation is
necessary to obtain adequate line-of-sight distances as required by the City Engineer; trees which, in the opinion of the City Engineer, will cause damage to existing public
improvements; trees which require maintenance or removal action for the protection of existing electrical
power or communication lines or other property of a public utility; trees damaged by thunderstorms, windstorms, flood, earthquakes, fire, widespread
organic disease or insect infestation, or other natural disasters and determined to be
dangerous by a police officer, fireman, civil defense official, or code enforcement officer in
their official capacity;



minor trimming and/or pruning of trees on developed property within the scope of typical
and reasonable tree maintenance; trees declared to be dead, diseased or dying, subject to the requirements of Section

18.162.090; fruit trees, including citrus, plum, nectarine, cherry, apricot, peach, pear, pomegranate,
persimmon, loquat, fig, avocado, and other species determined similar by the director of

3.8 development services. SPECIAL STATUS

WILDLIFE
Table 5 provides a summary of special status wildlife species reported to occur in the Project
region (i.e., the USGS’ Baldwin Park, San Dimas, Ontario, La Habra, Yorba Linda, Prado Dam,
Azusa, Glendora, and Mt. Baldy 7.5-minute quadrangles). This list includes species reported by
the CNDDB, supplemented with species from the Project Biologist’s experience that either occur
nearby or could occur based on the presence of suitable habitat. The table includes information
on the status, species habitat, and potential for occurrence. Note that these species are listed
taxonomically.

Of the 54 species reported from the Project region, two species (monarch butterfly [Danaus
plexippus] and Cooper’s hawk [Accipiter cooperii]) were incidentally observed during the summer
2022 general surveys and 23 species have potential or limited potential to occur in the BSA based
on the presence of suitable habitat. The remaining species would not be expected to occur
because the BSA lacks suitable habitat or because it is outside the current known geographic
range of the species. Species observed in the BSA and federally or State-listed species,
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San Dimas Municipal Code Text Amendment
(20-0005)
Candidate species, or Fully Protected species with potential or limited potential to occur are
discussed further below.

Focused surveys have not been conducted for special status wildlife species in the BSA.

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San Dimas Municipal Code Text Amendment
(20-0005)
TABLE 5

SPECIAL STATUS WILDLIFE SPECIES REPORTED FROM THE

PROJECT REGION
Federal
Status
State
Species Status
Invertebrates
Common
Name
Habitata Potential to
Occur
Overwintering sites consist of
forested
areas that provide protection
from the
elements and moderate
temperatures, as
well as nectar and clean water
sources
located nearby. Overwintering
sites are
within 1.5 miles of the Pacific
Ocean at
elevations of 200–300 feet
above msl.

Reproduction is dependent on
the
Observed (foraging)
(Ultrasystems 2022).

Not expected for
overwintering
because BSA is too far
inland
and is outside the
known
elevational range for
Candidate
(overwinterin
g)
Danaus
plexippus
monarch
butterfly
—
presence of milkweed (Asclepias
sp.).

Primarily occurs in coastal,
lowland, and
foothill areas with milkweed,
though also
in deserts and mountains.
overwinterin
g.

Inhabits areas with appropriate
food
sources (e.g., Antirrhinum,
Phacelia,
Clarkia, Dendromecon,
Eschscholzia, and
Eriogonum [CDFW 2023a]).

May occur; suitable
habitat. Bombus
crotchii
Crotch bumble
bee
— CE
Fish
Not expected to
occur; no
suitable habitat.

Oncorhynchus
mykiss
irideus pop. 10
steelhead
California
DPS
– southern Inhabits streams; can tolerate
warmer
water and more variable
conditions.

FE
—
CE
Inhabits warm, fluctuating
streams with
slow-moving or backwater
sections of
warm to cool streams; substrates
of sand
or mud.

Not expected to
occur; no
suitable habitat.

Gila
orcuttii
arroyo
chub
SSC
Inhabits permanent streams with
cool,
flowing, rocky-bottomed washes,
shallow
cobble, and gravel riffles.

Not expected to
occur; no
suitable habitat.

Rhinichthys osculus
ssp. 8
Santa Ana speckled
dace
Santa Ana sucker
— SSC
—
Inhabits coastal streams;
prefer
sand-rubble-boulder bottoms;
cool, clear
water; and algae.

Not expected to
occur; no
suitable habitat.

Catostomus
santaanae
Amphibians
FT
Breeds in ponds, reservoirs,
and
slow-moving streams and
lives in
terrestrial habitats.

Not expected to
occur; no
suitable habitat.

Taricha
torosa
Coast Range
newt
—
—
SSC
WL
50 Not expected to
occur; no
suitable habitat.

Ensatina
eschscholtzii
klauberi
Inhabits moist and shaded
evergreen and
deciduous woodlands.
large-blotched
ensatina
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Biological Technical
Report

San Dimas Municipal Code Text Amendment
(20-0005)
TABLE 5

SPECIAL STATUS WILDLIFE SPECIES REPORTED FROM THE

PROJECT REGION
Federal
Status
State
Species Common Status
Name
Habitata Potential to
Occur
Limited potential to occur for
foraging;
marginally
suitable
terrestrial habitat;
no
suitable
breeding
habitat.

Breeds in vernal pools in
grassland
habitats, but also hardwood
woodlands.

Spea
hammondii
western
spadefoot
— SSC
SSC
Inhabits semi-arid areas near
washes,
sandy riverbanks, riparian areas,
palm
oasis, Joshua tree, mixed
chaparral and
sagebrush; stream channels for
breeding
(typically 3rd order); adjacent
stream
terraces and uplands for
foraging and
wintering.

Not expected
to
occur; no
suitable
habitat.

Anaxyrus
californicus
Rana boylii
arroyo
toad
FE
Inhabits partly shaded shallow
streams
and riffles with a rocky
substrate in a
variety of habitats. Needs at
least some
cobble-sized substrate for egglaying.

Not expected to
occur; no
suitable habitat.
foothill yellowlegged
frog – south coast
DPS
FE
FE
SE
Inhabits lakes, ponds, meadow
streams,
isolated pools and open
riverbanks; rocky
canyons in narrow canyons and
in
chaparral.

Not expected to
occur; no
suitable habitat.
southern
mountain
yellow-legged
frog
Rana
muscosa
Reptiles
SE, WL
Inhabits marshes, rivers,
streams, and
irrigation ditches, usually with
aquatic
vegetation and basking sites and
suitable
upland habitat.

Not expected to
occur; no
suitable habitat.

Emys
marmorata
western pond turtle
coast horned lizard
orange-throated
whiptail
FPT
—
SSC
SSC
WL
Inhabits a wide variety of habitats
with
open areas for sunning, bushes
for cover,
and patches of loose soil for
burrowing.

May occur; suitable
habitat.

May occur; suitable
habitat.

May occur; suitable
habitat.

Phrynosoma
blainvillii
Aspidoscelis
hyperythra
Inhabits coastal scrub, chaparral,
and
hardwood woodlands; prefers
washes and
other sandy areas with patches of
brush
and rocks.
—
Inhabits deserts and semi-arid
areas with
sparse vegetation and open
areas,
woodland, and riparian areas.

Aspidoscelis tigris stejnegeri coastal
whiptail
— SSC
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San Dimas Municipal Code Text Amendment
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TABLE 5

SPECIAL STATUS WILDLIFE SPECIES REPORTED FROM THE

PROJECT REGION
Federal
Status
State
Species Common Status
Name
Habitata Potential to
Occur Inhabits sparsely vegetated
areas of
beach dunes, chaparral, pineoak
woodlands, desert scrub, sandy
washes,
and stream terraces with
sycamores,
cottonwoods, or oaks. Sometimes
found in
suburban gardens in Southern
California.

Spends most of its life beneath
the soil,
under rocks, boards, driftwood,
logs,
debris, or in leaf litter. Prefers
areas with
loose, sandy soil, moisture,
warmth, and
plant cover.
southern California
legless
lizard
May occur; suitable
habitat. Anniella
stebbinsi
— SSC
Inhabits a range of scrub and
grassland
habitats, often with loose or
sandy soils.

May occur; suitable
habitat.

May occur; suitable
habitat.

Arizona elegans occidentalis California
glossy snake
—
—
SSC
SSC
Inhabits brushy or shrubby
vegetation with
small mammal burrows for refuge
and
overwintering sites.

Salvadora
virgultea
hexalepiscoast patch-nosed
snake
two-striped garter
snake
red-diamond
rattlesnake
Found in or near permanent fresh
water,
often along streams with rocky
beds and
riparian growth.

Not expected to
occur; no
suitable habitat.

Thamnophis
hammondii
—
—
SSC
SSC
Inhabits rocky areas with
dense
vegetation in chaparral,
woodland,
grassland, and deserts.

May occur; suitable
habitat. Crotalus
ruber
Birds
Observed (foraging)
(Ultrasystems 2022);
expected
to occur for nesting;
suitable
foraging and nesting
habitat.

Forages in woodland. Nests in
riparian
growths of deciduous trees,
such as
(nesting) canyon bottoms on river
floodplains and/or
in live oaks.

WL Accipiter
cooperii
Aquila
chrysaetos
Cooper’s
hawk
golden eagle
—
—
Limited potential to occur
for
foraging; not expected to
occur
for nesting; suitable
foraging
habitat; no suitable
habitat.

Found in a variety of open WL, FP habitats (nesting &
wintering)
(desert, grassland, shrubland,
agriculture,
streams) especially near
mountains, hills,
and cliffs.

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San Dimas Municipal Code Text Amendment
(20-0005)
TABLE 5

SPECIAL STATUS WILDLIFE SPECIES REPORTED FROM THE

PROJECT REGION
Federal
Status
State
Species Common Status
Name
Habitata Potential to
Occur Limited potential to occur
for
foraging; not expected to
occur
for nesting; marginally
suitable
foraging habitat; BSA is
outside
the current known
geographic
range for nesting.

ST
(nesting)
Breeds over grassland-dominated
habitats
in North America.

Buteo
swainsoni
Swainson’s
hawk
—
—
—
Limited potential to occur
for
foraging and nesting;
marginally
suitable foraging and
nesting
habitat.

Inhabits open grasslands,
meadows, or
marshes close to isolated, densetopped
trees for nesting and
perching.

FP
(nesting) Elanus
leucurus
white-tailed
kite
Limited potential to occur
for
foraging; not expected to
occur
for nesting; marginally
suitable
foraging habitat; BSA is
outside
the current known
geographic
range for nesting.

Prefers vast open space areas
such as
estuaries, grasslands, and
deserts. Nests
in conifers or deciduous trees in
semi
open areas. Does not nest in
southern
California.

WL
(wintering) Coturnicops noveboracensis
merlin
Not expected to
occur; no
suitable habitat.

Coturnicops noveboracensis
yellow rail
—
—
SSC Inhabits freshwater
marshlands.

Inhabits freshwater marshes,
wet
meadows, and shallow margins
of
saltwater marshes bordering
larger bays.

Not expected to
occur; no
suitable habitat.

Laterallus jamaicensi
s
California black
rail
ST, FP coturniculu
s
Nests in riparian forests along
broad,
lower flood-bottoms of larger river
systems
with willows (Salix spp.), often
mixed with
cottonwoods (Populus sp.),
with
understory of blackberry (Rubus
sp.),
nettles (Urtica sp.), or wild grape
(Vitis
californica).

Not expected to
occur; no
suitable habitat.

Coccyzus
occidentali
s
americanus western
yellow-billed
SE
(nesting) FT
(nesting) cuckoo
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TABLE 5

SPECIAL STATUS WILDLIFE SPECIES REPORTED FROM THE

PROJECT REGION
Federal
Status
State
Species Common Status
Name
Habitata Potential to
Occur Limited potential to occur
for
foraging and nesting;
marginally
suitable foraging and
nesting
habitat.

Inhabits riparian bottomlands
with tall
willows and cottonwoods, also
belts of live
oak along stream courses.

SSC
(nesting) Asio otus long-eared
owl
—
Inhabits open, dry annual or
perennial
grasslands, deserts, and
scrublands with
low-growing vegetation; uses
California
ground squirrel burrows and
similar
openings for breeding.

Limited potential to
occur;
marginally suitable
foraging and
nesting habitat.

SSC
(burrow
sites)
Athene
cunicularia
burrowing
owl
black swift
—
—
Nests in dark inaccessible
sites with
unobstructed flight paths on
ledges or
shallow caves in steep rock
faces and
canyons, usually behind or
next to
waterfalls.

Not expected to
occur; no
suitable habitat.

SSC
(nesting) Cypseloides
niger
Inhabits riparian habitat along
rivers,
stream, and other wetlands with
dense
growths of willows, mule fat
(Baccharis
salicifolia ssp. salicifolia), etc.,
often with a
scattered overstory of
cottonwood.

Not expected to
occur; no
suitable habitat.
southwestern
willow
flycatcher
SE
(nesting) Empidonax traillii
extimus
FE
(nesting)
Inhabits riparian forest, riparian
scrub, and
riparian woodland, usually
nesting in
willows, mule fat, or mesquite
(Prosopis
sp.).

Not expected to
occur; no
suitable habitat.

SE
(nesting) Vireo bellii
pusillus
least Bell’s
vireo
FE
(nesting)
—
Inhabits short-grass prairie,
“bald” hills,
mountain meadows, open coastal
plains,
fallow agricultural fields, and
alkali flats.

Not expected to
occur; no
suitable habitat.

Eremophila alpestris
actia
California horned
lark
WL
ST
Colonial nester; nests primarily in
riparian
and other lowland habitats west
of the
desert. Requires vertical
banks/cliffs with
fine-textured/sandy soils near
streams,
rivers, lakes, or ocean to dig
nesting hole.

Not expected to
occur; no
suitable habitat.

Riparia
riparia
bank
swallow
—
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TABLE 5

SPECIAL STATUS WILDLIFE SPECIES REPORTED FROM THE

PROJECT REGION
Federal
Status
State
Species Common Status
Name
Habitata Potential to
Occur Inhabits coastal sage scrub
with tall
prickly-pear cactus for nesting
and
roosting. Coastal subspecies
(i.e.,
sandiegensis) occurs in San
Diego and
Orange Counties.

Not expected to occur;
outside
of current known range.

Cactus
wren of a different
subspecies
may occur; suitable
habitat.

Campylorhynchus
brunneicapillus
sandiegensis
coastal cactus
wren
— SSC
Polioptila
californica
californica coastal
California
Inhabits coastal sage scrub
in arid
washes, on mesas, and
slopes.

May occur; suitable
habitat.

May occur; suitable
habitat.

FT
—
SSC
WL
gnatcatche
r
Inhabits coastal sage scrub and
sparse
mixed chaparral, frequently on
relative
steep, rocky hillsides with grass
and forb
patches.

Aimophila
canescen
s
ruficeps southern California
rufous- crowned
sparrow
Inhabits dense grasslands on
rolling hills,
lowland plains, and valleys and
on
hillsides on lower mountain
slopes.

Not expected to
occur; no
suitable habitat.

SSC
(nesting) Ammodramus
savannarum
Icteria virens
grasshopper
sparrow
yellow-breasted
chat
tricolored
blackbird
yellow warbler
—
—
—
—
Inhabits riparian thickets of
willow and
other brushy tangles near
watercourses;
nests in low, dense riparian
vegetation
consisting of willows, blackberry,
and wild
grape.

Not expected to
occur; no
suitable habitat.

SSC
(nesting)

ST, SSC
(nesting
colony)
Inhabits freshwater marsh,
swamps, and
wetlands with open water and
protected
nesting substrate.

Not expected to
occur; no
suitable habitat.

Agelaius
tricolor
Inhabits riparian forest, riparian
scrub, and
riparian woodland, foraging and
nesting in
willow shrubs and thickets,
cottonwoods,
sycamores (Platanus sp.), ash
(Fraxinus
sp.), and alders (Alnus sp.).

Not expected to
occur; no
suitable habitat.

SSC
(nesting) Setophaga
petechia
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TABLE 5

SPECIAL STATUS WILDLIFE SPECIES REPORTED FROM THE

PROJECT REGION
Federal
Status
State
Species Status
Mammals
Common
Name
Habitata Potential to
Occur
Limited potential to occur for
foraging;
not expected to
occur for
roosting;
suitable
foraging
habitat; no
suitable
roosting
habitat.

Inhabits deserts, grasslands,
shrublands,
woodlands, and forest, most
commonly in
open, dry habitats with rocky
areas for
roosting.

Antrozous
pallidus
pallid bat — SSC
May occur for
foraging and
roosting; suitable
foraging and
roosting
habitat.

Riparian habitat near water.

Roosts
exclusively in trees,
particularly
sycamore, cottonwood, ash,
and
elderberry (Sambucus
sp.).

Lasiurus
frantzii
western red
bat
—
—
—
SSC
SSC
SSC
Inhabits valley foothill riparian,
desert
riparian, desert wash, and palm
oasis
habitats. Roosts in trees,
particularly
palms. Forages over water and
among
trees.

Not expected to occur
for
foraging or roosting; no
suitable
foraging or roosting
habitat.

Lasiurus
xanthinus
western yellow
bat
Inhabits many open, semi-arid to
arid
habitats including conifer and
deciduous
woodlands, coastal scrub,
grasslands, and
chaparral. Roosts in crevices in cliff
faces,
high buildings, trees, and
tunnels.

May occur for foraging
and
roosting; suitable foraging
and
roosting habitat.

Eumops perotis californicus western
mastiff bat
Nyctinomops femorosaccus pocketed
free-tailed bat
Inhabits pinyon-juniper woodlands,
desert
scrub, desert succulent shrub,
desert
riparian, desert
wash, alkali desert scrub, Joshua
tree,
and palm oasis. Roosts in crevices
of cliffs
Not expected to
occur; no
suitable habitat.
— SSC
and rocky
Rugged and rocky terrain; outcroppings.
roosts in
buildings, caves, rock crevices
of cliffs,
and rocky outcroppings.

Not expected to
occur; no
suitable habitat.

Nyctinomops
macrotis
big free-tailed
bat
—
—
SSC
SSC
Inhabits coastal scrub,
chaparral,
grasslands, and sagebrush,
usually in
association with rocks or coarse
gravel.
northwestern San
Diego
pocket mouse
May occur; suitable
habitat. Chaetodipus fallax
fallax
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TABLE 5

SPECIAL STATUS WILDLIFE SPECIES REPORTED FROM THE

PROJECT REGION
Federal
Status
State
Species Common Status
Name
Habitata Potential to
Occur Inhabits sparse scrub habitat,
alluvial
scrub/coastal scrub habitats on
gravelly
and sandy soils near river and
stream
terraces.

Not expected to occur;
outside
current known
geographic
range.

San Bernardino
kangaroo
rat
Dipodomys merriami
parvus

FE CE, SSC
Inhabits coastal scrub with
moderate to
dense canopies, rock outcrops,
rocky
cliffs, and slopes.

Neotoma bryanti [lepida]
Bryant’s
[San Diego May occur; suitable
habitat.

May occur; suitable
habitat.
—
—
SSC
SSC
intermedia desert]
woodrat
Inhabits dry, open, treeless
areas;
grasslands, coastal scrub,
agriculture, and
pastures, especially with friable
soils.

Taxidea
taxus
American
badger
Limited potential to occur
for
foraging; not expected to
deb
(breed) in the BSA;
potentially
suitable habitat but
fragmented
from larger areas of
open
space; no suitable
breeding
habitat.
mountain lion–
Southern
California/Central
Coast
Inhabits various habitats within
foothill and
mountain areas typically where
deer can
be found.

Puma
concolor
—
—
CE
FP
Evolutionar
y
Unit (ESU)
Significant
Occur between from 3,000 to
10,000 feet
above msl and graze and browse
in areas
of low growing vegetation close to
steep
terrain. Occur in steep slopes and
cliffs,
rough and rocky topography,
sparse
vegetation, canyons, washes, and
alluvial
fans. Water is a critical factor in
the
distribution of this sheep.

Not expected to
occur; no
suitable habitat.

Ovis canadensis
nelsoni
desert bighorn
sheep
msl: mean sea level; BSA: Biological Study Area; USFWS: U.S. Fish and Wildlife Service; CDFW: California Department of Fish and Wildlife. LEGEND:

Federal
(USFWS)
FE Endangered
State (CDFW)
SE
FT Endangered
Threatened
ST
FPT Proposed Threatened
Threatened
FP Fully Protected
CE Candidate Endangered
SSC Species of Special
Concern
WL Watch List
a Sources include CDFW 2023a
b Protected by California Fish and Game Code §§
4800-4810
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3.8.1 Monarch
Butterfly
The monarch butterfly (Danaus plexippus) is a federal Candidate2 species that is not yet listed or
proposed for listing. While the USFWS determined that listing the species as Threatened is
warranted, it is precluded by higher priority actions. Monarch butterflies lay their eggs on the
obligate milkweed (Asclepias sp.). Multiple generations of monarchs are produced through the
breeding season, with most adult butterflies living two to five weeks.

Overwintering adults enter
reproductive diapause and live for six to nine months (USFWS 2023c).

Each spring, monarchs
leave overwintering sites and disperse across California and eventually migrate to all western
states, searching for milkweed plants on which to lay their eggs.

Several generations are
produced throughout the spring, summer, and fall, with each generation spreading further across
the landscape. The last generation then migrates all the way back to the overwintering grounds
on the Pacific coast in the fall. Monarchs return to the same groves of trees each year (Xerces
Society 2023). In the western U.S., monarchs overwinter at groves of trees along the Pacific Coast
with a large concentration overwintering in California. Currently, the most common overwintering
groves consist of non-native blue gum (Eucalyptus sp.), but they also use native Monterey pine
(Pinus radiata), Monterey cypress (Hesperocyparis macrocarpa), western sycamore, and
redwood (Sequoia sempervirens). The majority of overwintering sites are found within 1.5 miles
of the Pacific Ocean, which moderates temperatures, at lower elevations (i.e., 200 to 300 feet
above msl) and situated on slopes oriented to the south, southwest, or west that provide the most
solar radiation (Xeres Society 2016). An overwintering site was reported in Schabarum Regional
Park in Rowland Heights, approximately 7.5 miles southwest of the BSA; 60 individuals were
observed in 1998, 2 in 1999, 7 in 2002, 6 in 2007, 25 in 2008, and 0 were observed in 2022 (Xeres
Society 2023).

Monarch butterfly was recorded as an incidental observation during the 2022 general surveys and
its hostplant, milkweed, was noted during botanical surveys. The BSA is over 50 miles from the
Pacific Ocean and the elevation of the BSA is higher than typical overwintering sites (i.e., 680 to
980 feet above msl). Additionally, there are no known overwintering sites mapped in the BSA
(Xeres Society 2023). Therefore, Monarch butterfly is not expected to overwinter in the BSA.

3.8.2 Crotch
Bumblebee
Crotch bumble bee is a Candidate to be State listed as Endangered. The Crotch bumble bee was
proposed as a Candidate to be State listed as Endangered in June 2019. The status of the Crotch
bumble bee has changed multiple times based on court rulings between June 2019 and
September 2022. Based on the most recent ruling by the California Supreme Court, the proposed
Candidate status was reinstated.

This species is a near endemic species in California. It occurs throughout most of southwestern
California including the Mediterranean region, along the Pacific coast, western deserts, Great
Valley and adjacent foothills (Williams 2014; Zungri 2005). The Crotch bumble bee is a ground
nester and often makes its nest in abandoned mammal burrows and can be found in most native
habitat types, although it prefers grassland and scrub habitats. Crotch bumble bee is a
short-tongued species and prefers food plants from the following families:

Asclepias, Chaenactis,
Lupinus, Medicago, Phacelia, and Salvia (Williams 2014). The CNDDB lists favored foodplants
from the following genera: Antirrhinum, Phacelia, Clarkia, Dendromecon, Eschscholzia, and
Eriogonum (CDFW 2023a). Grassland and scrub habitat, as well as several plant species from
these families are present; therefore, suitable habitat is present for this species. This species has
been historically and recently observed at multiple locations in the Project region. The most recent
2 The USFWS does not treat Candidate species as if they are listed until they are formally proposed for listing.

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nearby observations of this species were in Claremont, Glendora, San Gabriel Canyon, and Chino
Hills State Park in 2019 and 2020 (CDFW 2023a). Therefore, this species may occur. 3.8.3 Swainson’s
Hawk
Swainson’s hawk is a State-listed Threatened species; its nesting locations are protected. It
forages over grassland and ruderal vegetation types during migration to and from South America,
primarily feeding on small rodents, reptiles, and some insects within these habitats. This species
formerly bred along the coast in southern California, but breeding is now mostly limited to the
Sacramento and San Joaquin valleys, the extreme northeast part of California, as well as Mono
and Inyo counties (England et al. 1997). This species is threatened by loss of habitat, habitat
deterioration on the South American wintering grounds, human disturbance at nest sites,
shooting, and possibly pesticides (Remsen 1978). There are two historic records from Chino
(1920) and Prado Basin (1916), but no recent records of this species in the Project region (CDFW
2023a). Marginally suitable foraging habitat for this species is present throughout the BSA;
therefore, it may forage over the BSA during migration. However, it is not expected to nest in the
BSA because it does not nest in the Project region.

3.8.4 Golden
Eagle
Golden eagle is a California Species of Special Concern and a California Fully Protected species;
it is also protected by the federal Bald Eagle Act. Habitat for this species generally consists of
grasslands, deserts, savannas, and early successional stages of forest and shrub habitats. Broad
expanses of open country are required for foraging, while nesting is primarily restricted to rugged
mountainous areas with large trees or on cliffs (Johnsgard 2001). The golden eagle is an
uncommon resident throughout Southern California except in the Colorado Desert and Colorado
River where it is a casual winter visitor (Garrett and Dunn 1981). This species is threatened by
habitat destruction, shooting, and human disturbance at nest sites (Remsen 1978). This species
has been reported from Chino Hills (CDFW 2023a). Suitable foraging habitat is present for this
species throughout the BSA; however, no suitable nesting habitat is present. Therefore, the
golden eagle has a limited potential to occur for foraging but is not expected to occur for nesting
in the BSA.

3.8.5 White-tailed
Kite
White-tailed kite is a California Fully Protected species; its nesting locations are protected. This
species nests in oak and sycamore woodlands, mature willows with adjacent grasslands,
agricultural fields, and other open areas. Kites prey on voles (Microtus sp.) and other small, diurnal
mammals, occasionally on birds, insects, reptiles, and amphibians. Kites forage in undisturbed,
open grasslands, meadows, farmlands, and emergent wetlands. They soar, glide, and hover (i.e.,
“kite”) less than 100 feet above the ground in search of prey. This species has been reported from
Prado Basin and also Chino Hills (CDFW 2023a). Marginally suitable foraging and nesting habitat
for this species is present throughout the BSA; therefore, it has a limited potential to occur for
foraging and nesting.

3.8.6 Burrowing
Owl
Burrowing owl is a California Species of Special Concern; its breeding and wintering burrows are
protected. The western burrowing owl is a grassland specialist distributed throughout western
North America, where it occupies open areas with short vegetation and bare ground within shrub,
desert, and grassland environments. Burrowing owls use a wide variety of arid and semi-arid
environments, with well-drained, level to gently sloping areas characterized by sparse vegetation
and bare ground (Haug et al. 1993; Dechant et al. 2003). Burrowing owls in Florida excavate their
own burrows, but western burrowing owls depend upon the presence of burrowing mammals
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whose burrows are used for roosting and nesting (Haug et al. 1993). The presence or absence of
colonial mammal burrows (e.g., California ground squirrels) is often a major factor that limits the
presence or absence of burrowing owls. In Southern California, burrowing owls breed and forage
in grasslands and prefer flat to low rolling hills in treeless terrain. They are small owls that nest in
burrows, typically in open habitats most often along banks and roadsides.

The burrowing owl has
declined in many other areas due to habitat modification, poisoning of its prey items, shooting,
and human disturbance (Remsen 1978). This species has been reported from Chino Creek,
Prado Basin, Chino Airport, and Ontario (CDFW 2023a). The upland mustards or star thistle field
and upland mustard or star thistle fields (mowed) may have vegetation that is too dense to support
this species; even after mowing, there is a thick layer of thatch that is not favored by the species
that prefers low density vegetation. Therefore, burrowing owl has a limited potential to occur for
breeding or wintering.

3.8.7 Coastal California
Gnatcatcher
Coastal California gnatcatcher is a federally listed Threatened species and a California Species
of Special Concern. This species occurs in most of Baja California, Mexico’s arid regions, but this
subspecies is extremely localized in the United States, where it predominantly occurs in coastal
regions of highly urbanized Los Angeles, Orange, Riverside, and San Diego Counties (Atwood
1992). In California, this subspecies is a resident of coastal sage scrub vegetation types. The
breeding season for the coastal California gnatcatcher ranges from late February to August. Nests
are generally placed in a shrub about three feet above ground. Loss of habitat to urban
development and brood parasitism3 by brown-headed cowbirds (Molothrus ater) have been cited
as causes of coastal California gnatcatcher population decline (Unitt 1984; Atwood 1990). This
species has been reported from many locations in the Project region; the nearest locations to the
BSA are Bonelli Regional Park, Walnut Creek, San Jose Hills, Schabarum Park, Chino Hills,
Puente Hills (CDFW 2023a). Suitable habitat for coastal California gnatcatcher occurs in coastal
sage scrub vegetation types in the BSA. Therefore, this species may occur.

USFWS published a Revised Final Rule designating Critical Habitat for the coastal California
gnatcatcher in 2007 (USFWS 2007). This Revised Critical Habitat designates 197,303 acres in
San Diego, Orange, Riverside, San Bernardino, Los Angeles, and Ventura Counties. The BSA is
not located within the designated Revised Critical Habitat for the coastal California gnatcatcher.

3.8.8 Mountain
Lion
The mountain lion is currently a Candidate to be State listed as Threatened as an Evolutionary
Significant Unit comprised of the following subpopulations: (1) Santa Ana Mountains; (2) Eastern
Peninsular Ranges; (3) San Gabriel/San Bernardino Mountains; (4) Central Coast South (Santa
Monica Mountains); (5) Central Coast North (Santa Cruz Mountains); and (6) Central Coast
Central. CDFW is in the process of reviewing the petition for listing and evaluating available
information. CDFW status review report was expected in November 2021; as of October 2023, its
status has not been updated (CDFW 2023f). The mountain lion occurs throughout most of
California except for the Mojave and Colorado Deserts and the croplands of the Central Valley.

Mountain lions occur in a variety of habitats, especially brushy habitats and riparian areas with
interspersed irregular terrain, rocky outcrops, and tree/brush edges.

Mountain lions use caves,
natural cavities, and thickets for cover. Mountain lions use habitat connections for movement
among fragmented core habitat (Zeiner et al. 1988–1990). A major threat to this species is
fragmentation of habitat by spread of human developments and associated roads. Estimates of
effective population size highlight genetic isolation and raise significant concerns for viability in
Southern California and the Central Coast (Center for Biological Diversity 2019). As described
3 Brood parasitism is when one species lays its eggs in another species’ nest and the young are raised by the host
bird, often to the detriment of their biological young.

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above under wildlife movement, the BSA is surrounded by higher density residential development,
located approximately 0.5 mile from larger areas of open space in the East San Gabriel Valley
SEA (i.e., Walnut Creek, Bonelli Park). Additionally, there are significant barriers to movement
separating the BSA from these areas of open space, including SR-57 and I10. While potentially suitable habitat is present in the BSA, because the BSA is in a fragment of open space, mountain
lions have limited potential to occur. They would not be expected to den (breed) in the BSA.

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4.0 PROJECT

IMPACTS
The Project involves a municipal code text amendment, which would allow for grading, cut, and
fill, beyond the grading that is necessary for the primary residence, driveway, and garage for
properties located within the proposed MCTA planning area. At this time, no specific construction
activities are currently proposed. Because the future home-owner projects are unknown, the
maximum potential impact area is analyzed.

Each parcel is divided up into different categories of varying size (Figure 8). The pink areas in
Figure 8 represent 35 percent of the existing lot (by area) including existing structures,
landscaping, and currently undeveloped areas. The blue areas in Figure 8 represent a conceptual
grading extent that extends 20 feet beyond the 35 percent lot coverage area and is the area
anticipated to be the most typical area of impact for future home-owner projects to create more
usable space in their backyards. However, the text amendment would allow home-owners to
grade their yard in any configuration within the 1,000 cy limit; therefore, a worst-case scenario is
analyzed. The purple areas in Figure 8 represent the remainder of the lot.

These total of these
three areas represent the maximum potential impact area for each lot. The green areas in Figure 8
represent the existing conservation easement; these areas would not change following the text
amendment, they would remain as open space and could not be impacted by future home-owner
projects. The determination of impacts in this analysis is based on a comparison of maps depicting
maximum potential impact area and maps of biological resources in the BSA.

All future permanent structural impacts are assumed to be contained within the maximum
potential impact area (i.e., the pink, blue, and purple areas identified on Figure 8). All construction
activities, including equipment staging areas, and remedial grading are also assumed to be
contained within these areas.

Both direct and indirect impacts on biological resources have been evaluated.

Direct impacts are
those that involve the initial loss of habitats due to grading, construction, and construction-related
activities. Indirect impacts are those that would be related to temporary disturbance from
construction activities (e.g., noise, dust) and the long-term use of a project.

Biological impacts associated with future projects are evaluated with respect to the following
special status biological issues:



Species listed under federal or State Endangered
Species Acts; Species proposed for listing under federal or State Endangered Species Acts; Non-listed species that meet the criteria in the definition of “Rare” or “Endangered” in the
CEQA Guidelines (i.e., 14 California Code of Regulations, Section 15380)4;



Species designated as California Species of Special Concern, Fully Protected, or Watch
List species; Vegetation types (synonymous with “habitat” and “community”) suitable to support a
federally or State-listed Endangered or Threatened plant or wildlife species; Streambeds, waterbodies, wetlands, and their
associated vegetation;
4 Section 15380 of the CEQA Guidelines indicates that a lead agency can consider a nonlisted species (e.g., plant with a CRPR of 1B.1) to be Endangered, Rare, or Threatened if the species can be shown to meet the criteria in
the definition of Rare or Endangered. For the purposes of this discussion, the current scientific knowledge on the
population size and distribution for each special status species was considered in determining if a non-listed
species meets the definitions for Rare and Endangered according to Section 15380 of the CEQA Guidelines.

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San Dimas
MCTA
Legend
Project
Boundary
Project Parcels
35% Lot Coverage
Conservation
Easement Grading Area – 20 feet
beyond
35% Impact Area Limit Rancho Remainder of
Parcel
24 23
22 25
17 21
18 19 26 20
16 Key Map 27
15 §¨15 28 ANGELES

NATIONA
L
FOREST
14 §¨210 San §¨215 Project Location
no
13 ST2
Los
Angeles 29 ST ST §¨ 30 110 210 ST §¨10
710
12 §¨10 30 31 §¨605
32 ST60 ST142 §¨ Riverside
710 ST ST71 ST §¨ 91
105
72 33
ST Orange 19 §¨5 ST57
34 36 ST91 ST90
11 35 ²
0 0
175 350
Feet 10
9 1
50 100
8 Meters Scale: 1:4,200
7 5 2
6 4 3 Data Source: UltraSystems
(2022)
Aerial Source: Nearmap
2023
Project
Impacts
Figure 8
(Rev: 08/31/2023 JMC)
R:\Projects\SAN04\3SAN040200\Graphics\Bio\ex_Project_Impacts.pdf

San Dimas Municipal Code Text Amendment
(20-0005)


Vegetation types, other than wetlands, considered special status by regulatory agencies
(e.g., USFWS, CDFW) or resource conservation organizations; and Other species or issues of concern to regulatory agencies or conservation organizations. The actual and potential occurrence of these resources in the BSA was correlated with the
following significance criteria to determine whether the impacts of the Project on these resources
would be considered significant. 4.1 SIGNIFICANCE

CRITERIA
The environmental impacts relative to biological resources are assessed using impact
significance criteria that mirror the policy contained in CEQA, Section 21001(c) of the California
Public Resources Code. Accordingly, the State Legislature has established it to be the policy of
the state to:
“Prevent the elimination of fish or wildlife species due to man’s activities, ensure that fish
and wildlife populations do not drop below self-perpetuating levels, and preserve for future
Determining whether a project may have a significant effect, or impact plays generations representations of all plant and animal communities…” a critical role in the
CEQA process. According to CEQA, Section 15064.7, Thresholds of Significance, each public
agency is encouraged to develop and adopt (by ordinance, resolution, rule, or regulation)
thresholds of significance that the agency uses in the determination of the significance of
environmental effects. A significant threshold is quantitative, qualitative, or performance level of
a particular environmental effect, that would normally be determined to be significant by the
agency if the threshold is exceeded.

In the development of thresholds of significance for impacts to biological resources CEQA
provides guidance primarily in Section 15065, Mandatory Findings of Significance, and the CEQA
Guidelines, Appendix G, Environmental Checklist Form. Section 15065(a) states that a project
may have a significant effect where:
“The Project has the potential to substantially degrade the quality of the environment,
substantially reduce the habitat of a fish or wildlife species, cause a fish or wildlife
population to drop below self-sustaining levels, threaten to eliminate a plant or wildlife
community, reduce the number or restrict the range of an endangered, rare, or threatened
species…”
Appendix G of the CEQA Guidelines is more specific in addressing biological resources and
encompasses a broader range of resources to be considered, including:
candidate, sensitive, or
special status species; riparian habitat or other sensitive natural communities; federally protected
wetlands; fish and wildlife movement corridors; local policies or ordinances protecting biological
resources; and, adopted HCPs. These factors are considered through the checklist of questions
answered during the IS process that is used to determine appropriate environmental
documentation for a project (i.e., Negative Declaration, MND, or Environmental Impact Report).

Because these questions are derived from standards in other laws, regulations, and other
commonly used thresholds, it is reasonable to use these standards as a basis for defining
significance thresholds for an environmental document. For each of the thresholds identified
below, the section of CEQA upon which the threshold was derived has been provided. For the
purpose of this analysis, impacts to biological resources are considered significant (before
R:\Projects\SAN04\3SAN040200\Documentation\BioTech\San Dimas BioTech-010524.docx
63 Biological Technical
Report

San Dimas Municipal Code Text Amendment
(20-0005)
considering offsetting mitigation measures) if one or more of the follow conditions would result
from implementation of the Project:

1. If the Project has the potential to substantially degrade the quality of the environment
(15065[a]). 2. If the Project has the potential to substantially reduce the habitat of a fish or wildlife species
(15065[a]). 3. If the Project will cause a fish or wildlife populations to drop below self-sustaining levels
(15065[a]). 4. If the Project will threaten to eliminate a plant or animal community (15065[a]). 5. If the Project will reduce the number or restrict the range of an endangered, rare, or
threatened species5 (15065[a]). 6. If the Project has a substantial adverse effect, either directly or through habitat
modifications, on any species identified as a candidate, sensitive, or special status species
in local or regional plans, policies, or regulations, or by the California Department of Fish
and Game or U.S. Fish and Game and Wildlife Service (CEQA Guidelines, Appendix G,
IV. [a]).

7. If the Project has a substantial adverse effect on any riparian habitat or other sensitive
natural community identified in local or regional plans, policies, regulations, or by the
California Department of Fish and Game or U.S. Fish and Wildlife Service (CEQA
Guidelines, Appendix G, IV. [b]).

8. If the Project has a substantial adverse effect on federally protected wetlands as defined
by Section 404 of the Clean Water Act (including, but not limited to, marsh, vernal pool,
coastal, etc.) through direct removal, filling, hydrological interruption, or other means
(CEQA Guidelines, Appendix G, IV. [c]).

9. If the Project interferes substantially with the movement of any native or migratory fish or
wildlife species or with established native resident or migratory wildlife corridors or
impedes the use of native wildlife nursery sites (CEQA Guidelines, Appendix G, IV. [d]).

10. If the Project conflicts with any local policies or ordinances protecting biological resources,
such as a tree preservation policy or ordinance (CEQA Guidelines, Appendix G, IV. [e]). 11. If the Project conflicts with the provisions of an adopted Habitat Conservation Plan, Natural
Community Conservation Plan, or other approved local, regional, or state habitat
An evaluation of whether an impact on biological resources would result in a conservation plan (CEQA Guidelines, Appendix G, IV. [f]). “substantial adverse
effect” must consider both the resource itself and how that resource fits into a regional context.

For the Project, the regional setting of the Project generally includes the San Jose Hills, including
lands identified within the East San Gabriel Valley SEA (i.e., Walnut Creek, Bonelli Regional
Park/Puddingstone Reservoir, and the San Jose Hills/Walnut Islands), San Gabriel Mountains,
and Chino-Puente Hills.
5 Endangered and threatened species as used in this threshold are those listed by the USFWS and/or CDFW as
Threatened or Endangered. Section 15380 of CEQA indicates that a lead agency can consider a non-listed species
(e.g., CRPR 1B plants) to be Endangered, Rare, or Threatened for the purposes of CEQA if the species can be
shown to meet the criteria in the definition of rare or endangered. For the purposes of this discussion, the current
scientific knowledge on the population size and distribution for each special status species was considered in
determining if a non-listed species met the definitions for rare and endangered according to Section 15380 of
CEQA.

R:\Projects\SAN04\3SAN040200\Documentation\BioTech\San Dimas BioTech-010524.docx
64 Biological Technical
Report

San Dimas Municipal Code Text Amendment
(20-0005)
For the purposes of the impact analysis, “substantial adverse effect” is defined as the loss or harm
of a magnitude which, based on current scientific data and knowledge, would 1) substantially
diminish population numbers of a species or distribution of a habitat type within the region, or 2)
eliminate the functions and values of a biological resource in the region.

4.2 DIRECT

IMPACTS
The actual and potential occurrence of biological resources in the BSA vicinity was correlated with
the significance criteria described above to determine whether the maximum potential impact on
these resources would be significant. Potential direct impacts are described below.

4.2.1 Vegetation Types and
Other Areas
The maximum potential direct impact on vegetation types and other areas are shown in Table 6
and Figures 9A–9D. A detailed breakdown of impacts by lot is provided in Appendix C. The
vegetation types that may be impacted are discussed below. TABLE 6

VEGETATION TYPES AND OTHER
AREAS

IN THE BSA
Total in
Total the
Vegetation
in BSA
Maximum
Potential
Impact
Area (acres)
Conservatio
n
Easement
(acres)
Vegetation Type or Other
Area
Coastal Sage Scrub
(acres)
California Sagebrush Scrub (Disturbed)
California Buckwheat Scrub
California Buckwheat Scrub (Disturbed)
California Sagebrush – California
Buckwheat Scrub
California Sagebrush – Black Sage Scrub
Coast Prickly Pear Scrub

0.089

2.000

1.927

0.251

3.480

3.848

11.595

0.089

0.960

0.074

0.022

1.590

0.329

3.064

0.000

1.040

1.853

0.229

1.890

3.519
Subtotal Coastal Sage 8.531
Scrub
Native Woodland California Walnut
Groves

27.057

12.529

1.801

7.850

1.920

0.982

10.752

19.207

10.609

0.819
California Walnut Groves
(Disturbed)
Coast Live Oak Woodland
(Disturbed)
Subtotal Native Woodland

41.387 30.635
Non-Native
Woodland Pepper Tree
Groves

0.657

0.797

1.454

0.000

0.652

0.652

0.657

0.145

0.802
Eucalyptus
Groves Subtotal Non-Native
Woodland
Non-Native Herbaceous Upland Mustards or Star-thistle Fields Upland Mustards or Star-thistle Fields
(mowed)
Subtotal Non-Native Herbaceous
Developed Areas

9.179

12.094

21.273

2.048

6.011

8.059

7.131

6.083

13.214
Developed/Ornamenta
l

20.954

20.954

96.663

18.428

18.428

40.955

2.526
Subtotal Developed 2.526
Areas Total 55.708
R:\Projects\SAN04\3SAN040200\Documentation\BioTech\San Dimas BioTech-010524.docx
65 Biological Technical
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San Dimas
MCTA
Legend
Project
Boundary
Parcel
Conservation
Easement
35% Lot Coverage Grading Area – 20 feet
beyond
35% Impact Area Limit Rancho E E E E Remainder of
Parcel Coastal Sage Scrub
California Sagebrush Scrub
(Disturbed)
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
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California Buckwheat
Scrub
California Buckwheat Scrub (Disturbed)
California Sagebrush - California
Buckwheat Scrub
California Sagebrush - Black Sage Scrub
Coast Prickly Pear Scrub
24 E
E
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22E
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25E
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Native
Woodland E17
E
E
E
E
E
E
E
E
E
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E
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E
E
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E
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E
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E21
E
E
E
E
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E
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California Walnut
Groves E 1E8E E
E
E
E
E
E
E
E
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E
E
E
E
E
E
E
E
19 26 California Walnut Groves
(Disturbed)
Coast Live Oak Woodland
(Disturbed)
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
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E 2E0E E
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E
E
E
Non-Native
Woodland
E
E
E
E
E
E
E
E
E
E
E
E
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E16
E
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E Pepper Tree
Groves
Eucalyptus Groves
E 2E7E E
E
E
E
E
E
E
E
E
E
E
E
E
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E
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E E E E
E
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100
E8 Meters Scale: 1:4,200
E 7E
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E E 2
E 5 Data Source: Vegetation map developed by
UltraSystems (2022)
and updated by Psomas
(2023)
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Aerial Source: Nearmap
2023
Project Impacts – Vegetation
Types and Other
Areas
Figure 9A (Rev: 10/09/2023 JMC)
R:\Projects\SAN04\3SAN040200\Graphics\Bio\ex_ProjectImpacts_VegTypes.pdf

San Dimas
MCTA
9B Legend
Project
Boundary
Parcel 9C 9D
Conservation
Easement
35% Lot Coverage Grading Area – 20 feet
beyond
35% Impact Area Limit
E E E E Remainder of
Parcel Coastal Sage Scrub
California Sagebrush Scrub
(Disturbed)
California Buckwheat
Scrub
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California Sagebrush - California
Buckwheat Scrub
California Sagebrush - Black Sage Scrub
Coast Prickly Pear Scrub
Rancho
Native
Woodland California Walnut
Groves
California Walnut Groves
(Disturbed)
Coast Live Oak Woodland Non-Native (Disturbed) Woodland E
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Eucalyptus Groves 24 Non-Native
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E
E
E
E
E
E
Upland Mustards or Star-thistle Fields
Upland Mustards or Star-thistle Fields
(Mowed)
Developed Areas
E
E
E
E
E
E
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E
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E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
Developed/Ornamenta
l
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
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E
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2 E
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2 E
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2 E E
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0 0