Initial Study/Mitigated Negative Declaration Addendum (available in the City Clerk's Reading File) — Santa Clarita City Council, July 14, 2026 (part 2 of 2)

Photo
Number
List photographs and include descriptions in the table below.

Number photographs in the order that they are taken. Attach photographs and include annotations of features.

Step 5 Describe rationale for location of OHWM
Break in slope, change in vegetation type and density, and sediment changes.

OMB Control No. 0710-XXXX
Approval Expires:

Site Name: Haskell Canyon - Crossing 2 upstream Date and Time: 5/14/26 8:40amProject ID #:

Investigator(s): A.Cruz, L. Pliego GuzmanLocation (lat/long): 34.479354°, -118.509398' O
gage data LiDAR geologic maps
climatic data satellite imagery land use maps
Other:aerial photos topographic maps
Geomorphic indicators Sediment indicators Ancillary indicators Break in slope: Soil development:

Changes in character of soil:on the bank:
undercut bank:
valley bottom: b x
transition from pebble to siltOther: Weathered clasts or bedrock:
upper limit of sand-sized particles Other observed indicators?Shelving:
silt deposits:shelf at top of bank:

Vegetation Indicatorsnatural levee:
man-made berms or levees: a
Above OHWM
Channel bar:
shelving (berms) on bar:

X deciduous trees
moss to:

Yes No
forbs to:

ENG FORM 6250, AUG 2021 Page 1 of 4
other
berms:

Instream bedforms and other
bedload transport evidence:
vegetation
absent to:
graminoids to:
woody
shrubs to:
deciduous
trees to:
coniferous
trees to:

Check the appropriate boxes and select
the general vegetation change (e.g.,
graminoids to woody shrubs). Describe
the vegetation transition looking from
the middle of the channel, up the
banks, and into the floodplain.

Step 1 Site overview from remote and online resources
Check boxes for online resources used to evaluate site:

Change in vegetation type
and/or density:

Mudcracks: b
Changes in particle-sized
distribution:

Vegetation matted down
and/or bent:

Exposed roots below
intact soil layer:

PREVIOUS EDITIONS ARE OBSOLETE.

Describe:

Line impressed upon the bank.

Step 4 Is additional information needed to
support this determination?
If yes, describe and attach information
to datasheet:

Wracking/presence of
organic litter:

Presence of large wood:

Leaf litter disturbed or
washed away:

Water staining:
unvegetated:
vegetation transition
(go to veg. indicators)
sediment transition
(go to sed. indicators)
upper limit of deposition
on bar:

Describe land use and flow conditions from online resources.

Were there any recent extreme events (floods or drought)? N/A
Step 2 Site conditions during field assessment
First look for changes in channel shape, depositional and erosional features, and changes in vegetation and sediment type, size, density, and distribution. Make note of natural or man-made disturbances that would affect flow and channel form, such as bridges, riprap, landslides, rockfalls etc.

Underground culvert runs under the road crossing with riprap surrounding the adjacent crossing. Vegetation changes from unvegetated within the streambed and to mature trees along the bank and nonnative grasses in the uplands. There is cobble size rocks within the channel invert, drainage patterns, and small weedy saplings. The surrounding upland sediment is sandy.

U.S. Army Corps of Engineers (USACE)

RAPID ORDINARY HIGH WATER MARK (OHWM) FIELD IDENTIFICATION DATA SHEET The proponent agency is Headquarters USACE CECW-CO-R.

Step 3 Check the boxes next to the indicators used to identify the location of the OHWM.

OHWM is at a transition point, therefore some indicators that are used to determine location may be just below and above the OHWM. From the drop-down menu next to each indicator, select the appropriate location of the indicator by selecting either just below 'b', at x', or just above 'a' the OHWM.

OHWM. Go to page 2 to describe overall rationale for location of OHWM, write any additional observations, and to attach a photo log. deposition bedload indicators
(e.g., imbricated clasts,
gravel sheets, etc.)
bedforms (e.g., poofs,
riffles, steps, etc):
erosional bedload indicators
(e.g., obstacle marks, scour,
smoothing, etc.)
Secondary channels:

See Appendix B. Site Photographs
Project ID #:

Additional observations or notes
7,
L.
)y. --- iUb
J
y
Tt—•—fi
V

OAWMD-D
Attach a photo log of the site. Use the table below, or attach separately.

Photo log attached? If no, explain why not:Yes No
Photograph description

Page 2 of 4 ends

Photo
Number
List photographs and include descriptions in the table below.

Number photographs in the order that they are taken. Attach photographs and include annotations of features.

Step 5 Describe rationale for location of OHWM
Break in slope, change in vegetation type and density, sediment changes, and mudcracks.

OMB Control No. 0710-XXXX
Approval Expires:

Site Name: Haskell Canyon - Crossing 2 downstream Date and Time: 5/14/26 9:00amProject ID #:

Investigator(s): A.Cruz, L. Pliego GuzmanLocation (lat/long): 34.478837°, -118.509313 o gage data LiDAR geologic maps
climatic data satellite imagery land use maps
Other:aerial photos topographic maps
Geomorphic indicators Sediment indicators Ancillary indicators bBreak in slope: Soil development:

Changes in character of soil:on the bank:
undercut bank: b
valley bottom: b x
transition from pebble to siltOther: Weathered clasts or bedrock:
upper limit of sand-sized particles Other observed indicators?Shelving:
silt deposits:shelf at top of bank:

Vegetation Indicatorsnatural levee:
a
Channel bar:
shelving (berms) on bar:

X woody shrubs
b moss to:

Yes No
forbs to:

ENG FORM 6250, AUG 2021 Page 1 of 4
Instream bedforms and other
bedload transport evidence:
vegetation
absent to:
unvegetated:
vegetation transition
(go to veg. indicators)
sediment transition
(go to sed. indicators)
man-made berms or levees:
other
berms: ---------------------------
graminoids to:
woody
shrubs to:
deciduous
trees to:
coniferous
trees to:

Step 1 Site overview from remote and online resources
Check boxes for online resources used to evaluate site:

Change in vegetation type
and/or density:

Mudcracks: b
Changes in particle-sized
distribution:

Vegetation matted down
and/or bent:

Exposed roots below
intact soil layer:

PREVIOUS EDITIONS ARE OBSOLETE.

Describe:

Line impressed upon the bank.

Step 4 Is additional information needed to
support this determination?
If yes, describe and attach information
to datasheet:

Presence of large wood: b
Leaf litter disturbed or
washed away:

Water staining:

Wracking/presence of
organic litter:
upper limit of deposition
on bar:

Describe land use and flow conditions from online resources.

U.S. Army Corps of Engineers (USACE)

RAPID ORDINARY HIGH WATER MARK (OHWM) FIELD IDENTIFICATION DATA SHEET The proponent agency is Headquarters USACE CECW-CO-R.

Step 3 Check the boxes next to the indicators used to identify the location of the OHWM.

OHWM. Go to page 2 to describe overall rationale for location of OHWM, write any additional observations, and to attach a photo log. deposition bedload indicators
(e.g., imbricated clasts,
gravel sheets, etc.)
bedforms (e.g., poofs,
riffles, steps, etc.):
erosional bedload indicators
(e.g., obstacle marks, scour,
smoothing, etc.)
Secondary channels:

See Appendix B. Site Photographs
Project ID #:

Additional observations or notes
j
(T)
LNyUAWM
T":

Attach a photo log of the site. Use the table below, or attach separately.

Photo log attached? If no, explain why not:Yes No
Photograph description

Page 2 of 4 ends

Photo
Number
List photographs and include descriptions in the table below.

Number photographs in the order that they are taken. Attach photographs and include annotations of features.

Step 5 Describe rationale for location of OHWM
Break in slope, change in vegetation type and density, sediment changes, and mudcracks.

Appendix D Beta Arid West Streamflow Duration
Assessment Method Data Forms

Northeast
Southeast
6N21 en Pottinger
3 Lanyon
r
N
$ , L
Paar
4 J
G
isV Leofict
was
A
Western
Mountains
Great
Plains
Arid
West
y Pacific
Northwest
Report generated date: 2026-05-15
Project name: Haskell Canyon - Crossing 1 downstream
Site code: Crossing 1 - downstream end
Arid West SDAM classification: EPHEMERAL
https://www. cpa.gov/streamflow-duration-assessment
Visit date: 2026-05-14
। •
2 %
Streamflow Duration Assessment Method Report
SDAM Version 3.0.1 Release Date: October 2025
General site information
Location: 34.476393, -118.508293
Observed hydrology
Percent of reach with surface flow: 0
Percent of reach with surface and sub-surface flows: 0
Site photos
SDAM Version 3.0.1 October 2025, Date of site visit: 2026-05-14 Page 2 of 9 Current weather conditions: Clear/Sunny
Notes on current or recent weather conditions:

Number of isolated pools: 0
Notes on observed hydrology: No hydrology or recent evidence of hydrology was observed.

Surrounding land use within 100 m: openspace, Other Natural Notes on land use: Surrounding reach are dirt access roads for utilities as well as an archery range and other recreational trails, such as bike paths.

Description of reach boundaries: The reach begins downstream of the road crossing. It extends 40 meters downstream and is confined by the project boundaries.

Assessment reach length (m): 40
Disturbed or difficult conditions: Other (explain in notes) Notes on disturbances or difficult site conditions: Evidence of previous fire on the woody vegetation, but regrowth has taken place.

Project name or number: Haskell Canyon - Crossing 1 downstream Site code or identifier: Crossing 1 - downstream end
Regional SDAM: Arid West
Adjacent SDAM Regions within 10 miles: None
Assessor(s): A. Cruz, L, Pliego Guzman
Waterway name: Unnamed
Visit date: 2026-05-14
Top of reach looking downstream:
t
Fe?
. - •U
“Ta <e
ns wte
$92
s
Tcreasm —hr
2 .
a
2 3 wr—
—
- irs. $,6
"e $yaf
d.’
Middle of reach looking upstream:
t27
ss
■
5 cr I t — 1 -ned
L .tter
34 ,, " - 4$
X
: C
' —027!
gkF T- J 55 .coon “4
—08 1- st. \
B.1

2. V . wh -
—
V I
adsz. Er N WARYLsJI
SDAM Version 3.0.1 October 2025, Date of site visit: 2026-05-14 Page 3 of 9 w
4 ur
77 ,
6 y
■
— .

V y
L. 2
0 y / > e-d
g u
an
f - Th „
-s
st
4 —
2-
4 .
r R
CM ele s’.
" ‘ • i
■ s ■
S. ..

E A t4f
-g
■ -C TU"as a J —"e. sh " ■
- ' - 7Pdsle .
gete
27 ’
. s ’
, 7
AT
teled
4 ■. a ’'<as
• ___S c ?
sa" '. o se "e
...
— '.J -:

Middle of reach looking downstream:
... 7
“ t j .8)3 - at
2 ’• -
. vs$3-
2o-nr.- -
etne
r fvl.

2. * Ei7—— x ts
S
f. S
y
3 Pe AT? *es .22
Bottom of reach looking upstream:
aut
■
t
—
s 5
2 — —
-rr ■
— ‘ -
$tei4 i \
“eot -
-Dtb:
"5 t -“^5 - -
. 2 < X S •
.Z
SDAM Version 3.0.1 October 2025, Date of site visit: 2026-05-14 Page 4 of 9 " *
' .. “3
i ;
5 —ThV/ -
- t '
a* — .

0.1.s y.
2- .
- a
1- s
"pepte
e — Y ’ • -
- e s
*
fr -
■
: o- ■ ■
--PI i
hs : -
... ;
“ allot
i
tre
is “
5 - . •
"oter3 2 wars
- “d)5 —
--s"
i -
Site sketch
I
- MPSRIAM
N
C
No
. -MidD
V willeS
1 Indicators
Mean bankfull channel width photos and descriptions:

SDAM Version 3.0.1 October 2025, Date of site visit: 2026-05-14 Page 5 of 9 Mean bankfull channel width (m): 3.1
Notes on mean bankfull channel width:

Perennial indicator taxa: No perennial indicator taxa detected Aquatic macroinvertebrates in assessment area: Aquatic macroinvertebrates absent V
V
(owWgAwi
J_ 1
1000
OB
I 10
SDAM Version 3.0.1 October 2025, Date of site visit: 2026-05-14 Page 6 of 9 Number of hydrophytic plant species: 2
Vegetation in assessment area:

Notes on hydrophytic plants:

Salix laevigata and Salix lasiolepis were observed along the reach’s banks. No other FACW or OBL species were noted.

Hydrophyte photos and photo descriptions:

Notes on aquatic macroinvertebrates:

Macroinvertebrate photos and photo descriptions:

Slope (to the nearest half-per cent): 100
Notes about slope:

Slope photos and descriptions:

SDAM Version 3.0.1 October 2025, Date of site visit: 2026-05-14 Page 7 of 9 Prevalence of upland rooted plants in streambed: 3 (Strong) Rooted upland plants are absent from the streambed/thalweg.

Notes about upland rooted plants:

No upland rooted plants were observed in the streambed.

Upland rooted plants photos and descriptions:

Differences in vegetation: 0.5
Notes about differences in vegetation:

Some FACW species exist within the reach’s riparian corridor, but this includes few individuals.

Otherwise, the composition between the riparian areas and the adjacent upland are the same and include mature and sapling trees and nonnative grasses.

Vegetation differences photos and descriptions:

Riffle-pool sequence: 0 (Poor) No riffle-pool sequences observed.

Notes about riffle-pool sequence:

Algal cover: Not Detected
Check here if algae exclusively appears to have been deposited from an upstream source, and no local growth is evident: Not checked
Notes about algal cover:

N/A
Algal cover photos and descriptions:

Supplemental information
Additional notes about the assessment:

Supplemental information photos and descriptions:

SDAM resources
SDAM Version 3.0.1 October 2025, Date of site visit: 2026-05-14 Page 8 of 9 Arid West SDAM classification

EPHEMERAL
N/A
Riffle-pool photos and descriptions:

End of Report
SDAM Version 3.0.1 October 2025, Date of site visit: 2026-05-14 Page 9 of 9 Northeast
Southeast
6N21
7 —9
(
=
s
4 S
Leofict
"I
Western
Mountains
Great
Plains
Arid
West
y Pacific
Northwest
asS
Pettinijer
Canyon
3 92
%
&
https://www.epa.gov/streamflow-duration-assessment
Visit date: 2026-05-14
Report generated date: 2026-05-18
Project name: Haskell Canyon
Site code: Crossing 2 downstream
Arid West SDAM classification: EPHEMERAL
a
e
go"
"I
Streamflow Duration Assessment Method Report
SDAM Version 3.0.1 Release Date: October 2025
4 r
General site information
Location: 34.476324, -118.508256
Observed hydrology
Percent of reach with surface flow: 0
Percent of reach with surface and sub-surface flows: 0
Site photos
SDAM Version 3.0.1 October 2025, Date of site visit: 2026-05-14 Page 2 of 11 Current weather conditions: Clear/Sunny
Notes on current or recent weather conditions:

Number of isolated pools: 0
Notes on observed hydrology: No recent or current hydrology observed.

Surrounding land use within 100 m: openspace, Other Natural Notes on land use: Surrounding reach are dirt access roads for utilities as well as an archery range and other open space/recreational trails, such as bike paths.

Description of reach boundaries: The top of the reach boundary begins from the road and underground culvert and extends 40m downstream. The reach is confided by the project site boundaries.

Assessment reach length (m): 40
Disturbed or difficult conditions: Other (explain in notes) Notes on disturbances or difficult site conditions: Tire marks within the feature bottom. No other difficult conditions or obvious disturbances.

Project name or number: Haskell Canyon
Site code or identifier: Crossing 2 downstream
Regional SDAM: Arid West
Adjacent SDAM Regions within 10 miles: None
Assessor(s): A. Cruz, L. Pliego Guzman
Waterway name: Unnamed
Visit date: 2026-05-14
Top of reach looking downstream:
o“e 4 yaeriw
ie
in
ri 43
i
re-y -E
P r‘ 'l
■ 2 rh "r.

T
5 2
. — LkntheJ2 ‘T
Middle of reach looking upstream:

Ath ■ thS.
7“

5. T va055
(
t
2r a351
L
••de
' A1 .
fres14010
-$ 1
SDAM Version 3.0.1 October 2025, Date of site visit: 2026-05-14 Page 3 of 11 '' De. " S-
2,
* "
Pe IS0
Hao
koo ■ ■
KSo,
1i
3* er
- e g ajn. 5*
ee
•w
pur-ee
■ V h
“sbt,
salsr
-
e • .
.. :
“d., -
e - 5*7 -- •
-r
- -- E ‘
...
» s
—s
oa
a Sr w ' - “ sz -
.? ■:
—si t ce , - - eeer
r

1. . ■
3 Pa .
arst ‘ " P
ie.cl
. -.5—0
—U
-=
Daellere I2,1 - .
' -e-hezvi-e
cP_t ′ e -Yr, 57.aAa*
-Peedi2 _
Ee"T
*1-* . thee 9
- . srj
3 * “ •
haul • e
..S
Middle of reach looking downstream:

Tty 34
le L
aewy
a"
1 - /w
MP
umne
-
*e42

2. wr?I
Js
2 w. 22-
Bottom of reach looking upstream:

IT
Pgrter
in
I* Emm
3s5
ge —e- spetnnz x "us
2n - 1
he
IIr ““ _-ress . . s --
-A-"ee -erte s.5A Pry i
35 gerer,.
a2
• -
V
e;th —2 s r"vaC
L 0
ax=
SDAM Version 3.0.1 October 2025, Date of site visit: 2026-05-14 Page 4 of 11 r
E —
te by
r
a
..
- -age
Ui22
$
i -
as
-
ty.
: . ■ rs
s -e
sh
—f7d
: 77
ee’r"". orbes
!
r
42474 : J-A r
.' - hos 115.
2 2
-el F
sar
x d
ese 4 w)
au ■ 07
. Sens A J.rRenes
... * “2'
" ■ S e : C. X • ■1. F ;c
rs
—
"ss
"I"
2e s Saka
-9
w
me- wxdtyy As’:Saue
i P t,
"* , C(h
1210
—Ai attw
‘ t,
_ e -
Ch
L - curerbs-r
N
. n ■
• .

Site sketch
! IVAMW— c
40M 1V r \ -TavVIXV
w
MeshtAw
Indicators
Mean bankfull channel width photos and descriptions:

SDAM Version 3.0.1 October 2025, Date of site visit: 2026-05-14 Page 5 of 11 Mean bankfull channel width (m): 7.4333333
Notes on mean bankfull channel width: The bankfull widths are mostly consistent along the reach.

The mid point is wider than the top and bottom, but the bankfull indicators remain the same.

JaNX
Mud
tcoQ -
ne see ""
31 ipist ILe A 'MP,g !
0 t.
15,f
: gt
eet •<WC
■
Y
atthar te2 *Z' g-r50.

P
( ‘
w aes7.
94 A fared itAl 4
Description: Mid point bankfull measurement.

SDAM Version 3.0.1 October 2025, Date of site visit: 2026-05-14 Page 6 of 11 Perennial indicator taxa: No perennial indicator taxa detected Aquatic macroinvertebrates in assessment area: Aquatic macroinvertebrates absent Notes on aquatic macroinvertebrates:

Macroinvertebrate photos and photo descriptions:
seeP)
tee
4 /
" I "U
*.
idts
—a
e
208 d
4 “Us.

Ro oe
“Bears)
£, :
y zidinu --
rAF
Ts
EPZBac
V
- -e.00 s*
svorel
at
P t ( t it
3 on * ■s , . iF
PA *
“U.Uh . ")
1 ' —
K 1
-
-w *126
" 1 -
s C r H
.P
Slope photos and descriptions:

Hydrophyte photos and photo descriptions:
(A1

5. v
a At ■ i
ASacita 1
ear
Ge
— , a
.. 4.
7 wer
to TAr ■ s rotets
be2 n
*Jth d- sit
-th -
ar “wa
T- T
,5 ’ < 1
k.4
Description: Tamarix ramosissima, not a hydrophyte, on bank near mid point.

SDAM Version 3.0.1 October 2025, Date of site visit: 2026-05-14 Page 7 of 11 1 5
Number of hydrophytic plant species: 0
Vegetation in assessment area:

Notes on hydrophytic plants:

No hydrophytic vegetation was within the reach. There were FAC and UPL species on the banks and within the streambed.

Slope (to the nearest half-per cent): 100
Notes about slope:
—
2 Fr
sera, "ArS jaeis. ■ “ar. . .
—~‘S
‘s '
Mier
‘e
193
-
a
--
SePy
2 . "* rus. ■'.»>’• Mt
st -
aa
it 3 ."ss cr 7 TE
ad -P
A 5e
Upland rooted plants photos and descriptions:
or
Piesun-ting
*, e s i G1 L
tiwe
L
Ha ,thll
•63
tel Sasko ‘rSAs- 1“in6.
t
~ 2 191“oevo".$44r -
jppg * P tarE
imhe.

1. .V
f24
nuis
Description: Typical density of upland plants within the streambed.

SDAM Version 3.0.1 October 2025, Date of site visit: 2026-05-14 Page 8 of 11 Algal cover: Not Detected
Check here if algae exclusively appears to have been deposited from an upstream source, and no local growth is evident: Not checked
Prevalence of upland rooted plants in streambed: 2 (Moderate) There are a few rooted upland plants present within the streambed/thalweg.

Notes about upland rooted plants:

Baccharis salicifolia, Tamarix ramosissima, Nicotiana glauca, Hirschfeldia incana, and nonnative grasses occurred in greater densities along the riparian corridor of the reach, while small saplings and upland weeds were found within the channel invert.
%%
IC '
—
wr.
> I ■ I
MB
‘ F
e
- N
■ ------
ja‘ p2 -
a
e ASE
Hi
ss.
y.
we
''
w
at / 1
A
“H.
. Leen '
s
*
■■ ■.
at
we “Fume
Riffle-pool photos and descriptions:

Supplemental information
Additional notes about the assessment:

Supplemental information photos and descriptions:

SDAM Version 3.0.1 October 2025, Date of site visit: 2026-05-14 Page 9 of 11 Differences in vegetation: 1 (Weak) Vegetation growing along the reach may occur in greater densities or grow more vigorously than vegetation in the adjacent uplands, but there are no dramatic compositional differences between the two.

Notes about differences in vegetation:

Few saplings and trees are growing along the reach, none of which would qualify as high quality riparian vegetation. The compositional difference between the riparian corridor and adjacent uplands is mostly unchanged as nonnative grasses dominate both communities.

Vegetation differences photos and descriptions:

Riffle-pool sequence: 0 (Poor) No riffle-pool sequences observed.

Notes about riffle-pool sequence:

Notes about algal cover:

Algal cover photos and descriptions:
‘r”
ad
dWitwe /I
E
W.IaX “5w
g
hg
Beeppasow
L. 3
They.
s-s, -
% V
5 “ 25 g
NasL.

SDAM Version 3.0.1 October 2025, Date of site visit: 2026-05-14 Page 10 of 11 Arid West SDAM classification

EPHEMERAL
Description: Culverts and riprap upstr
earn of reach and underneath road crossing. The feature continues upstream beyond the road. 27 f 2 “ia Y
as 11
wd
‘ s -
A '
26 a
f
wn
. - an“ed
—
ah
H. Wet
Pes
tantr.
see' ent
SPAM resources
End of Report
SDAM Version 3.0.1 October 2025, Date of site visit: 2026-05-14 Page 11 of 11

Appendix E Antecedent Precipitation Tool Result

Antecedent Precipitation vs Normal Range based on NOAA's Daily Global Historical Climatology Network 10 Condition Value Product
2 6
2026-04-14 0.466142 2.55 0.830709 2 2 4

1.268898 5.212205 3.181102 2 1 2
Normal Conditions -12
Weighted AElevation AWeather Station Name Coordinates Elevation (ft) Distance (mi) SAUGUS PWR PLT 1 34.59, -118.4542 2161.089 8.432 717.111 9.841 LANCASTER 34.7411, -118.2125 2337.927 17.253 176.838 10.815 485 3 Ywh nnE
Figures and tables made by the
Antecedent Precipitation Tool
Version 3.0
70th %ile (in)

0.703937
30th %ile (in)

0.079134
30 Days Ending
2026-05-14
Observed (in)

0.082677
Coordinates
Observation Date
Elevation (ft)
Drought Index (PDSI)
WebWIMP H2O Balance
Developed by:

U.S. Army Corps of Engineers and
U.S. Army Engineer Research and
Development Center
Wetness Condition
Normal
Normal
Normal

34.47639, -118.50829
2026-05-14
1443.978
Mild drought (2026-04)
Dry Season
US Army Corps
of Engineers.

CERDC
Days Normal
10868
2026-03-15
Result
Days Antecedent
87 Month Weight
3 2026-03-15
—
2026-04-14
]
1 ----- Daily Total
----- 30-Day Rolling Total
30-Year Normal Range
2026-05-14
v__
0)
CD
Rainfall (Inches)
in
(D
APPENDIX C: CULTURAL RESOURCES ASSESSMENT

M B A K E R I N T L . C O M 801 S. Grand Avenue, #250, Los Angeles, CA 90017 (213) 627-8645
1 June 8, 2026
Mr. Dan Duncan
City of Santa Clarita
Public Works Department
23920 Valencia Boulevard, Suite 300
Santa Clarita, CA 91355

RE: CULTURAL RESOURCES ASSESSMENT FOR THE HASKELL CANYON OPEN SPACE SHARED

ACCESS IMPROVEMENTS PROJECT, CITY OF SANTA CLARITA, LOS ANGELES COUNTY,

CALIFORNIA
Dear Mr. Duncan:

In 2025, the City of Santa Clarita (City) published an Initial Study/Mitigated Negative Declaration (IS/MND) for the Haskell Canyon Bike Park Project. The IS/MND concluded that impacts to unanticipated cultural resources may be avoided or reduced to a less than significant level by implementing certain mitigation measures adopted in a Project Mitigation Monitoring and Reporting Program. Subsequently, as a modification to the Haskell Canyon Bike Park Project, the City proposed the Haskell Canyon Open Space Shared Access Improvements Project (Project) to improve access to the Haskell Canyon Bike Park by improving Haskell Canyon Road from Copper Hill Drive north to the City Archery Range. The Project is subject to compliance with the California Environmental Quality Act (CEQA); the City is the CEQA lead agency. This Phase 1 Cultural Resources Assessment is produced compliant with CEQA, and is intended to support an Addendum to the Haskell Canyon Bike Park Project IS/MND.

In support of the Project, Michael Baker International completed a paleontological records search; South Central Coastal Information Center (SCCIC) records search; literature, aerial photograph, and historical map review; Native American Heritage Commission (NAHC) Sacred Lands File search; archaeological and paleontological survey; archaeological and paleontological sensitivity assessments; and a resource impact assessment to determine whether the Project could result in significant impacts to historical and archaeological resources as defined by CEQA Section 15064.5. Based on the findings herein, one resource that is listed in the California Register of Historical Resources, P-19-003131, is mapped as overlapping the Project site. However, no elements of the resource will be impacted by the Project. As a result, the proposed Project would not cause a substantial adverse change in the significance of a historical resource under CEQA (Section 15064.5[b][1]). Table 1 summarizes the eligibility and impact conclusions for the Project. As a result, the existing mitigation measures for the Haskell Canyon Bike Park are sufficient for the proposed Project. Methods, results, and recommendations are detailed below.

INTERNATIONAL
Michael Baker

MICHAEL BAKER INTERNATIONAL
Cultural Resources Identification Memorandum, Haskell Canyon Open Space Shared Access Improvements Project, City of Santa Clarita, Los Angeles County, California

M B A K E R I N T L . C O M 801 S. Grand Avenue, #250, Los Angeles, CA 90017 (213) 267-8645
2 TABLE 1. SUMMARY OF ELIGIBILITY DETERMINATION AND IMPACT CONCLUSION

PROJECT DESCRIPTION
The Project is intended to improve existing access roads associated with Haskell Canyon Bike Park. The Project would install approximately 4 inches of asphalt concrete over an approximately 1.4-mile-long dirt access road from Copper Hill Drive north to the City Archery Range. Two approximately 0.25-mile spur roads that divert off of the main dirt road to provide access to the Haskell Canyon Bike Park and the City Archery Range would also be paved. Two dip crossings over the Haskell Canyon Wash would also be constructed, one for each of the spur roads.

PROJECT SITE
The Project site is located along Haskell Canyon Road north of Copper Hill Drive, within the City of Santa Clarita, in Los Angeles County (Attachment 1). It is located in Township 4 North, Range 16 West, Section 1, and in Township 5 North, Range 16 West, Section 36, and is mapped in the Newhall, California, 1:24,000 scale United States Geological Survey (USGS) map.

REGULATORY FRAMEWORK

CALIFORNIA ENVIRONMENTAL QUALITY ACT
CEQA applies to all discretionary projects undertaken or subject to approval by the state's public agencies (California Code of Regulations [CCR] Title 14[3] Section 15002[i]). CEQA conditions that it is the policy of the State of California to "take all action necessary to provide the people of this State with historic environmental qualities and preserve for future generations examples of the major periods of California history" (Public Resources Code [PRC] Section 21001[b], [c]). Under the provisions of CEQA, "a project with an effect that may cause a substantial adverse change in the significance of a historical resource is a project that may have a significant effect on the environment" (CCR Title 14[3] Section 15064.5[b]).

CEQA Guidelines Section 15064.5(a) defines a "historical resource" as a resource that meets one or more of the following criteria:
 Listed in, or eligible for listing in, the California Register.  Listed in a local register of historical resources (as defined in PRC Section 5020.1[k]).  Identified as significant in a historical resource survey meeting PRC Section 5024.1(g) requirements.

Resource Name National Register/California Register Eligibility Determination
Impact
Conclusion
P-19-003131
2S2. Individually determined eligible for inclusion in the National Register of Historic Places. Listed in the California Register of Historical Resources.

No Impact

MICHAEL BAKER INTERNATIONAL
Cultural Resources Identification Memorandum, Haskell Canyon Open Space Shared Access Improvements Project, City of Santa Clarita, Los Angeles County, California

M B A K E R I N T L . C O M 801 S. Grand Avenue, #250, Los Angeles, CA 90017 (213) 267-8645
3  Determined to be a historical resource by a project's lead agency (CCR Title 14[3] Section 15064.5[a]).

A historical resource consists of "any object, building, structure, site, area, place, record, or manuscript which a lead agency determines to be historically significant or significant in the architectural, engineering, scientific, economic, agricultural, educational, social, political, military, or cultural annals of California. … Generally, a resource shall be considered by the lead agency to be 'historically significant' if the resource meets the criteria for listing in the California Register of Historical Resources" (CCR Title 14[3] Section 15064.5[a][3]).

The CEQA planning process requires considering historical resources and unique archaeological resources (CCR Title 14[3] Section 15064.5; PRC Section 21083.2). If feasible, adverse effects to the significance of historical resources must be avoided or mitigated (CCR Title 14[3] Section 15064.5[b][4]).

The significance of a historical resource is impaired when a project demolishes or materially alters adversely those physical characteristics of a historical resource that convey its historical significance and justify its eligibility for the California Register. If there is a substantial adverse change in the significance of a historical resource, the preparation of an environmental impact report may be required (CCR Title 14[3] Section 15065[a]).

If the cultural resource in question is an archaeological site, CEQA (CCR Title 14[3] Section 15064.5[c][1]) requires that the lead agency first determine if the site is a historical resource as defined in CCR Title 14(3) Section 15064.5(a). If the site qualifies as a historical resource, potential adverse impacts must be considered in the same manner as a historical resource (California Office of Historic Preservation [OHP] 2001a). If the archaeological site does not qualify as a historical resource but does qualify as a unique archaeological site, then the archaeological site is treated in accordance with PRC Section 21083.2 (CCR Title 14[3] Section 15069.5[c][3]). In practice, most archaeological sites that meet the definition of a unique archaeological resource will also meet the definition of a historical resource. CEQA defines a "unique archaeological resource" as an archaeological artifact, object, or site about which it can be demonstrated that, without merely adding to the current body of knowledge, there is a high probability that it meets one or more of the following criteria:
 Contains information needed to answer important scientific research questions and there is a demonstrable public interest in that information.
 Has a special and particular quality, such as being the oldest of its type or the best available example of its type.
 Is directly associated with a scientifically recognized important prehistoric or historic event or person (PRC Section 21083.2[g]).

If an impact to a historical or archaeological resource is significant, CEQA requires feasible mitigation measures to minimize the impact (CCR Title 14[3] Section 15126.4[a][1]). Mitigation must lessen or eliminate the physical impact that the project will have on the resource. Generally, drawings, photographs, and/or displays do not mitigate the physical impact on the environment caused by the demolition or the destruction of a historical resource. However, CEQA (PRC Section 21002.1[b]) requires that all feasible mitigation be undertaken even if it does not mitigate impacts to a less than significant level (OHP 2001b: 9).

MICHAEL BAKER INTERNATIONAL
Cultural Resources Identification Memorandum, Haskell Canyon Open Space Shared Access Improvements Project, City of Santa Clarita, Los Angeles County, California

M B A K E R I N T L . C O M 801 S. Grand Avenue, #250, Los Angeles, CA 90017 (213) 267-8645
4 HASKELL CANYON BIKE PARK PROJECT INITIAL STUDY/MITIGATED NEGATIVE DECLARATION In 2025, the City published an IS/MND for the Haskell Canyon Bike Park Project. The IS/MND concluded that impacts to unanticipated cultural resources may be avoided or reduced to a less than significant level by implementing the following mitigation measures, which were presented in the Project Mitigation Monitoring and Reporting Program:

CUL-1: Cultural Resources Monitoring
Archaeological monitoring shall occur in the project area during all soil-disturbing and grubbing/grading/excavation/trenching activities, which could impact archaeological resources. The monitor will observe construction activities to determine if cultural resources are present below the surface. The Principal Investigator (PI) will submit a request to the City during construction, requesting a modification to the monitoring program when field conditions occur that could reduce or increase the potential for resources to be present. Such field conditions may include modern disturbance post-dating the previous grading/trenching activities, presence of fossil formations, or when native soils are encountered. Ground-disturbing activities include, but are not limited to, geotechnical boring, trenching, grading, excavating, and the demolition of building foundations. Monitoring shall be conducted by an archaeological monitor who is working under the guidance of a qualified archaeologist meeting the Secretary of the Interior’s Professional Qualification Standards for archaeology (48 Federal Register 44738). The archaeological monitor shall observe ground-disturbing activities in all areas with the potential to contain significant cultural deposits. The archaeological monitor shall maintain and submit monitoring logs at the conclusion of monitoring. If discoveries are made during ground-disturbing activities, additional work may be required in accordance with the terms specified in the cultural resources monitoring and discovery plan.

At the completion of grading, excavation, and ground-disturbing activities on the site, a monitoring report shall be submitted to the City that documents monitoring activities conducted by the project archaeologist within 60 days of completion of monitoring. This report shall document the daily archaeological monitoring results; describe how each mitigation measure was fulfilled; document the type of cultural resources recovered and the disposition of such resources; and, in a confidential appendix, include the daily/weekly monitoring notes from the qualified archaeologist. Final monitoring reports will be submitted to the City and the South Central Coastal Information Center. If a federal agency (e.g., the US Army Corps of Engineers) is involved in the project due to a federal nexus, monitoring reports may also be shared with that agency. Any unanticipated archaeological finds and subsequent evaluation or data recovery efforts will be documented in the report.

CUL-2: Evaluation of Unanticipated Finds; Phase II Testing In the event an archaeological resource is unearthed during excavation, all excavations shall be halted within 50 feet of the find. Work shall stop immediately, and the discovery shall be evaluated by a qualified archaeologist meeting the Secretary of the Interior’s Professional Qualification Standards for archaeology (48 Federal Register 44738), pursuant to the procedures set forth at CEQA Guidelines Section 15064.5 and 36 Code of Federal Regulations Part 60.4.

Depending on the nature of the find, the determination of significance may require additional excavation, potentially including the preparation and execution of a Phase II archaeological

MICHAEL BAKER INTERNATIONAL
Cultural Resources Identification Memorandum, Haskell Canyon Open Space Shared Access Improvements Project, City of Santa Clarita, Los Angeles County, California

M B A K E R I N T L . C O M 801 S. Grand Avenue, #250, Los Angeles, CA 90017 (213) 267-8645
5 testing plan. As the lead agency, the City shall make a determination of significance on the basis of the recommendations of the qualified archaeologist.

If the resource is determined not to be significant, then resource-specific work shall be completed, and construction may proceed. If the resource is determined to be significant and avoidance is not feasible, then a resource-specific archaeological resources treatment plan shall be prepared and executed in accordance with Mitigation Measure CUL-3 prior to recommencing ground-disturbing activities that may impact the resource.

CUL-3: Treatment of Significant Resources

Avoidance and preservation-in-place are the preferred treatment for historical resources, but avoidance is not always feasible. In the event that a historical resource is discovered and disturbance to such a resource cannot be avoided, one of the following treatments shall be implemented: avoidance, site capping, creation of conservation easements, or archaeological data recovery.

If avoidance, site capping, or creation of a conservation easement is determined infeasible, then a Phase III data recovery excavation will be required, pursuant to CEQA Guidelines Section 15064.5 and Section 106 36 Code of Federal Regulations 800.13, to document the resource’s scientifically consequential information. The Phase III data recovery plan shall be prepared in consultation with the consulting tribe(s) if the discovery is associated with a precontact or ethnohistoric context. The Phase III study shall consist of the recovery and analysis of a statistically significant sample of the site through archaeological excavation, radiocarbon dating of organic materials or other kinds of dating, cataloging, specialist analysis, and report writing designed to document the resource in perpetuity.

During the course of construction, all discovered resources shall be temporarily curated in a secure location on-site or at the offices of the qualified archaeologist. The removal of any artifacts from the project area for cataloging and analysis during evaluation and analysis will need to be thoroughly inventoried with tribal monitor oversight of the process if the discovery is associated with a precontact or ethnohistoric context. The landowner shall relinquish ownership of all cultural resources, including sacred items, burial goods, and all archaeological artifacts and non-human remains, as part of the required mitigation for impacts to cultural resources. The applicant shall relinquish the artifacts through one or more of the following methods and provide the City with evidence of final disposition of the cultural material collection:
 Accommodate the process for on-site reburial of the discovered items with the consulting tribe(s). This shall include measures and provisions to protect the future reburial area from any future impacts. Reburial shall not occur until all cataloguing and basic recordation have been completed.
 A curation agreement with an appropriate qualified repository in Los Angeles County that meets federal standards per 36 Code of Federal Regulations Part 79, and therefore will be professionally curated and made available to other archaeologists/researchers for further study. The collections and associated records

MICHAEL BAKER INTERNATIONAL
Cultural Resources Identification Memorandum, Haskell Canyon Open Space Shared Access Improvements Project, City of Santa Clarita, Los Angeles County, California

M B A K E R I N T L . C O M 801 S. Grand Avenue, #250, Los Angeles, CA 90017 (213) 267-8645
6 shall be transferred, including title, to an appropriate curation facility in Los Angeles County, to be accompanied by payment of the fees necessary for permanent curation.
 If more than one Native American tribe is involved with the project and the tribes cannot come to a consensus as to the disposition of cultural materials, they shall be curated at an appropriate qualified repository determined by the City.

CUL-4: Treatment of Unanticipated Finds of Human Remains If human skeletal remains are found during earth-moving activities, work shall be suspended and the Los Angeles County Coroner’s Office shall be notified. Standard guidelines set by California law provide for the treatment of skeletal material of Native American origin (California Public Resources Code, Sections 5097.98 et seq.; Health and Safety Code, Section 7050.5). If the remains are found to be archaeological, then after the coroner releases the site, the qualified professional archaeologist, in consultation with the most likely descendant, shall prepare an archaeological treatment plan in accordance with Mitigation Measure CUL-3 that also incorporates the guidance in “A Professional Guide for the Preservation and Protection of Native American Remains and Associated Grave Goods,” published by the California Native American Heritage Commission.

In compliance with AB 52 (PRC 21074), which requires tribal consultation as part of the CEQA process, the City initiated consultation in April 2024 with the Fernandeño Tataviam Band of Mission Indians (FTBMI). Based on consultation with the FTBMI, which concluded on April 18, 2025, Mitigation Measure TCR-1 through Mitigation Measure TCR-5 were incorporated into the IS/MND to reduce impacts related to tribal cultural resources to a less-than-significant-level.

Mitigation Measure TCR-1: Document Release
Any and all archaeological documents created as a part of the Project (isolate records, site records, survey reports, testing reports, and monitoring reports) shall be provided to the Fernandeño Tataviam Band of Mission Indians.

Mitigation Measure TCR-2: Cultural Resources Monitoring and Mitigation Plan In the event of an inadvertent discovery of Tribal Cultural Resources, its importance will be determined by the Tribal Monitor, the Project archaeologist, and the City. If determined to be important, a Cultural Resources Monitoring and Mitigation Plan (CRMMP) shall be prepared, in consultation with the Fernandeño Tataviam Band of Mission Indians. The CRMMP will provide details regarding the process for in-field treatment of inadvertent discoveries and the disposition of inadvertently discovered non-funerary resources.

Mitigation Measure TCR-3: Full Time Monitoring, Initial Pass, (1) Monitor The Project applicant shall retain a professional Tribal Monitor procured by the Fernandeño Tataviam Band of Mission Indians to observe all ground-disturbing activities including, but not limited to, clearing, grubbing, grading, excavating, digging, trenching, plowing, drilling, tunneling, quarrying, leveling, driving posts, auguring, blasting, stripping topsoil or similar

MICHAEL BAKER INTERNATIONAL
Cultural Resources Identification Memorandum, Haskell Canyon Open Space Shared Access Improvements Project, City of Santa Clarita, Los Angeles County, California

M B A K E R I N T L . C O M 801 S. Grand Avenue, #250, Los Angeles, CA 90017 (213) 267-8645
7 activity during the initial pass (the first disturbance of all soil to the total depth of which it will be disturbed). If cultural resources are not encountered after observing the initial pass of all ground-disturbance, additional Tribal Monitoring is not required. If cultural resources are encountered during the initial pass, they shall be assessed by the Tribal Monitor, the Project archaeologist, and the City. If determined to be important, the Tribal Monitor(s) shall continue observing ground disturbing activities to the satisfaction of the Tribal Monitor, Project archaeologist, and the City to ensure important Tribal Cultural Resources are identified. Tribal Monitoring Services will continue until confirmation is received from the Project applicant, in writing, that all scheduled activities pertaining to Tribal Monitoring are complete, be it initial pass or all disturbance, dependent upon inadvertent discovery. If the Project’s scheduled activities require the Tribal Monitor(s) to leave the Project for a period of time and return, confirmation shall be submitted to the Tribe by Client, in writing, upon completion of each set of scheduled activities and 5 days notice (if possible) shall be submitted to the Tribe by Project applicant, in writing, prior to the start of each set of scheduled activities. If cultural resources are encountered, the Tribal Monitor will have the authority to request that ground-disturbing activities cease within 60 feet of discovery and a qualified archaeologist meeting Secretary of Interior standards retained by the Project applicant as well as the Tribal Monitor shall assess the find.

Mitigation Measure TCR-4: In the Event of an Inadvertent Discovery If cultural resources are discovered during project activities, all work in the immediate vicinity of the find (within a 60-foot buffer) shall cease and a qualified archaeologist meeting Secretary of Interior standards retained by the Project applicant shall assess the find. Work on the portions of the Project outside of the buffered area may continue during this assessment period. The Fernandeño Tataviam Band of Mission Indians shall be contacted about any pre-contact and/or post-contact finds and be provided information after the archaeologist makes their initial assessment of the nature of the find, to provide Tribal input with regards to significance and treatment. Mitigation
Measure TCR-5: Human Remains
In the inadvertent discovery of human remains or funerary objects during any activities associated with the Project, work in the immediate vicinity (within a 100-foot buffer of the find) shall cease and the County Coroner shall be contacted pursuant to State Health and Safety Code §7050.5 and that code shall be enforced for the duration of the Project. Inadvertent discoveries of human remains and/or funerary object(s) are subject to California State Health and Safety Code Section 7050.5, and the subsequent disposition of those discoveries shall be decided by the Most Likely Descendant (MLD), as determined by the Native American Heritage Commission (NAHC), should those findings be determined as Native American in origin.

CULTURAL RESOURCES IDENTIFICATION METHODS
The results of the paleontological records search, SCCIC records search, archival research, literature, historical map and aerial photograph review, NAHC Sacred Lands File search, field survey, and archaeological and paleontological site sensitivity analysis are presented below.

MICHAEL BAKER INTERNATIONAL
Cultural Resources Identification Memorandum, Haskell Canyon Open Space Shared Access Improvements Project, City of Santa Clarita, Los Angeles County, California

M B A K E R I N T L . C O M 801 S. Grand Avenue, #250, Los Angeles, CA 90017 (213) 267-8645
8 PALEONTOLOGICAL ARCHIVAL RESEARCH
Archival research included a consultation of documented paleontological localities held by the Natural History Museum of Los Angeles County (NHMLAC). At the request of Michael Baker International, NHMLAC staff searched its holdings for information regarding documented paleontological resources. Michael Baker International staff supplemented the information received from the NHMLAC with data from a review of geological maps.

The geology of the Santa Clarita area was mapped by Campbell et al. (2016) at a scale of 1:100,000 and by Dibblee and Ehrenspeck (1996) at a scale of 1:24,000. Geologic units underlying the Project area are mapped as alluvial gravel, sand, and clay of the valley area that date to the Holocene epoch (Qa of Dibblee and Ehrenspeck 1996). The Mint Canyon formation consists of terrestrial sedimentary deposits ranging from conglomerate through sandstone to claystone that date to the Miocene epoch (Tmc of Dibblee and Ehrenspeck 1996).

Natural History Museum of Los Angeles
On May 19, 2026, Michael Baker International staff requested the NHMLAC search its holdings for documented paleontological resources within and near the Project site. The NHMLAC responded in a letter dated May 23, 2026 (Attachment 2). The records search showed one previously identified fossil locality within the Project site. Additionally, fossil localities were recorded, either at the surface or at depth, near the Project site from geologic units similar to those underlying the Project site (Table 2).

TABLE 2. PREVIOUSLY DOCUMENTED NHMLAC FOSSIL LOCALITIES Collection
Number Taxa Formation Chronological
Unit Location

LACM IP
17899
Invertebrates (primarily
mollusks)
Castaic Formation
(surface) Late Miocene
Haskell Canyon
north of Copper Hill
Drive

LACM VP
7772;

LACM IP
17900,
17901, 17902,
7758
Carnivore (Carnivora)
and invertebrates
(primarily mollusks)
Castaic Formation
(very fine sands) Late Miocene
Between Haskell
Canyon and
Kathleen Avenue

LACM VP
5461; LACM
IP 7770,
10271, 404,
7754
Tapir (Tapiridae);
Invertebrates
(uncatalogued)
Castaic Formation
(4
m thick shell bed)
Late Miocene
Ridge west of
Pettinger
Canyon Road and
north of
N. Rock Canyon
Drive

LACM VP
7988,
7989
Numerous specimens of
rodent (Rodentia)
Saugus Formation
(paleosol bounded
by
conglomerate
beds)
Plio-Pleistocene
Five Knolls
development,
Golden Valley Road,
Santa
Clarita

MICHAEL BAKER INTERNATIONAL
Cultural Resources Identification Memorandum, Haskell Canyon Open Space Shared Access Improvements Project, City of Santa Clarita, Los Angeles County, California

M B A K E R I N T L . C O M 801 S. Grand Avenue, #250, Los Angeles, CA 90017 (213) 267-8645
9 Notes: LACM IP = Natural History Museum of Los Angeles County Invertebrate Paleontology Department Locality LACM VP = Natural History Museum of Los Angeles County Vertebrate Paleontology Department Locality

SOUTH CENTRAL COASTAL INFORMATION CENTER
On May 18, 2026, Michael Baker International Archaeologist Marc Beherec, PhD, RPA, conducted a records search at the SCCIC. The records search included the Project site and a 0.5-mile radius. The SCCIC, located at California State University, Fullerton, is part of the California Historical Resources Information System, an affiliate of the California OHP. It is the official state repository of cultural resources records and reports for Los Angeles County. As part of the records search, the following federal and California inventories were reviewed:
 National Register of Historic Places (National Park Service 2020).  California Inventory of Historic Resources (OHP 1976).  Archaeological Resources Directory (OHP 2022). The directory includes the OHP determinations of eligibility for archaeological resources in Los Angeles County.  California Points of Historical Interest (OHP 2026a).  California Historical Landmarks (OHP 2026a).
 Built Environment Resources Directory for Los Angeles County (OHP 2026b). The directory includes built resources reviewed for eligibility for the National Register and the California Historical Landmarks programs through federal and state environmental compliance laws, and built resources nominated under federal and state registration programs, including the National Register, California Register, California Historical Landmarks, and California Points of Historical Interest.

Records Search Results
Previous Studies
The records search results identified 17 previous cultural resource studies completed within the records search limits (Table 3). Five of these reports partially overlap the Project area, primarily for transmission line projects. Less than 5 percent of the Project site has been previously surveyed.

Collection
Number Taxa Formation Chronological
Unit Location

LACM VP
6804 Horse clade (Equidae) Saugus formation Plio-Pleistocene Saugus Elementary School
LACM IP 3922 Invertebrates
(gastropods and others)
Mint Canyon
formation Miocene
South of Vasquez
Canyon Road, east of
the junction of
Vasquez
Canyon Road and
Bouquet Canyon
Road

LACM VP
6363,
5150, CIT566
Primitive horse
(Pliohippus)
Mint Canyon
formation Miocene
West side of Cruzan
Mesa, north of
Solemint

MICHAEL BAKER INTERNATIONAL
Cultural Resources Identification Memorandum, Haskell Canyon Open Space Shared Access Improvements Project, City of Santa Clarita, Los Angeles County, California

M B A K E R I N T L . C O M 801 S. Grand Avenue, #250, Los Angeles, CA 90017 (213) 267-8645
10 In addition to the previous studies documented at the SCCIC, a cultural resources study was conducted for the Haskell Canyon Bike Park (Daniels and Young 2024). An additional monitoring report was prepared after the Bike Park construction (Daniels 2026).

TABLE 3. PREVIOUS STUDIES WITHIN A HALF MILE OF THE PROJECT AREA Report No. Report Title Author, Date
LA-00615

Cultural Resources Investigation Re: Tentative Minor Land Division Map Number 11518
Robinson, R.

W., 1979

LA-02447 Cultural Resources Archaeological Survey Seco Canyon Development IV Project Tentative Tracts: 47447, 37539 and 46908
Tartaglia,
Louis J., 1991
LA-02500 Cultural Resources Archaeological Survey Wildwood Hills II Project Tentative Tract 46183 Tartaglia,
Louis J., 1991
LA-02775 Cultural Resources Survey and Impact Assessment for Vesting Tentative Tract Map No. 47657, Haskell Canyon, Los Angeles County, California Singer, Clay
A., John E.

Atwood, and
Shelley Marie
Gomes, 1992
LA-03105 Archaeological Survey and Impact Assessment of Tentative Tract No.51789, an 80 Acre Parcel in Haskell Canyon, Santa Clarita, Los Angeles County, California Dillon, Brian
D., 1994
LA-03690 Cultural Resources Evaluation City of Santa Clarita Circulation Element EIR Los Angeles County, California
Wlodarski,
Robert J.,
1997
LA-04104* Cultural Resource Evaluation of the LADWP Power Plant 1--olive Line 1 Transmission Line Maintenance Project Los Angeles County, California Macko,
Michael E.,
1993
LA-05523 Archaeological Test Excavations at CA-LAN-2245 and CA-LAN-2246, Located in the Haskell Canyon Area of Los Angeles County, California McKenna,
Jeanette A.,
2000
LA-08993* SCE Tehachapi Renewable Transmission Project, Shoofly Corridor, Santa Clarita Area, Los Angeles County, California
Schmidt,
James J.,
2007
LA-09764 Supplemental Archaeological Assessment, Antelope to Pardee Segment 1 (Tehachapi Renewable Transmission Project), Variance 5, Los Angeles County, California
Gust, Sherri,
2008
LA-09920* Results of the Class III Cultural Resources Investigation for the Southern California Edison Tehachapi Renewable Transmission Project (TRTP) Segment 1, Angeles National Forest and Adjacent Lands, Los Angeles County, California, ARR No. 05-01-01079
Schmidt,
James J., June
A. Schmidt,
and Gwen R.

Romani, 2008
LA-09866 Cultural Resources Records Search and Site Visit Results for T-Mobile Candidate SV01537T (Copper Hill Site), Santa Clarita, CA Bonner,
Wayne H.,
2008

MICHAEL BAKER INTERNATIONAL
Cultural Resources Identification Memorandum, Haskell Canyon Open Space Shared Access Improvements Project, City of Santa Clarita, Los Angeles County, California

M B A K E R I N T L . C O M 801 S. Grand Avenue, #250, Los Angeles, CA 90017 (213) 267-8645
11 Report No. Report Title Author, Date
LA-10205* Archaeological Investigation for Meadow Peak Project, Vesting Tentative Tract Map 47760 with Final Report
Messick,
Peter, 2003
LA-10210* Cultural Resources Survey Report for Antelope-Pardee 500-kV Transmission Project
Ahmet, Koral
and Roger D.

Mason, 2006
LA-10236 Cultural Resources Records Search and Site Visit Results for T-Mobile USA Candidate SV01537C(XR) (Copper Hill/SCE Santa Clara-Vincent 500kV M25-T1), Vacant Land-Edison Tower, Santa Clarita, Los Angeles County, California Bonner,
Wayne H. and
Arabesque
Said, 2009
LA-10559 Archaeological Impact Analysis: Vesting Tentative Tract Map 43589, 7.5 Acres in Bouquet Canyon Area, Los Angeles County
Schmidt,
James J.,
2000
LA-11593 Cultural Resources Records Search and Site Visit Results AT&T Mobility, LLC Candidate NL0442-01 (SCE Glen Canyon), 28655 Rock Canyon Drive, Santa Clarita, Los Angeles County, California
Bonner,
Wayne H. and
Kathleen A.

Crawford,
2011
*Indicates a study partially overlapping the Project site.

Previously Recorded Resources
The SCCIC records search results indicated that seven previously recorded cultural resources have been identified and recorded within the half-mile radius of the Project area, one of which overlaps the Project site and is described below. In addition to the resources identified during the records search, one additional resource, a twentieth-century mining operation (Bluecloud-MBI-01H), was documented during the initial survey for the Haskell Canyon Bike Park Project (Daniels and Young 2024). All of the resources identified within the search area were historic-aged resources. No prehistoric-aged sites were identified.

TABLE 4. PREVIOUSLY RECORDED RESOURCES WITHIN A HALF MILE OF THE PROJECT AREA Resource
Number (P-
19-#)
Trinomial
(CA-LAN-#) Description Date, Recorder
002132 2132H High voltage electric transmission lines,
supported on four legs, rocket ship shaped
carrying two 3-line circuits, constructed in
1917
1992, Cole, McDowell, Shelton
1993, M. Macko
2004, Whitley
2007, Koji Tsunoda, Jones and
Stokes
2010, J. M. Simon
003131* 3131H The site consists of a mid-20th century
historic refuse dump, a refuse scatter, a
corral, vegetation growing in linear patterns,
a fence line, possible livestock pens, a
concrete foundation, a wood platform, a
2003, Peter Messick
2013, M. Vader and V. Ortiz

MICHAEL BAKER INTERNATIONAL
Cultural Resources Identification Memorandum, Haskell Canyon Open Space Shared Access Improvements Project, City of Santa Clarita, Los Angeles County, California

M B A K E R I N T L . C O M 801 S. Grand Avenue, #250, Los Angeles, CA 90017 (213) 267-8645
12 Resource
Number (P-
19-#)
Trinomial
(CA-LAN-#) Description Date, Recorder
house foundation, and a leveled trailer pad
associated with hog farm
003132 3132H Concrete floor/foundation, mound, and
scattered refuse
2003, Peter Messick
004420 4420H River cobble stacked dry rock wall 2013, M. Vader and V. Ortiz 004720 4720H Refuse deposit and foundations associated
with middle 20th century hog farm
2014, Michael Dice
186912 - Approximately seven-mile-long dirt road 2001, D. W. Vance 2007, David S. Peebles and
Joanna Huckabee
188492 - Angeles National Forest maintained dirt road 2007, David S. Peebles and Joanna Huckabee
*Indicates a resource that overlaps the Project site.

P-19-003131
One documented resource, P-19-003131, overlaps the Project site. The resource consists of the remains of a twentieth-century hog farm, including a refuse dump, a refuse scatter, a corral, vegetation growing in linear patterns, a fence line, possible livestock pens, a concrete foundation, a wood platform, a house foundation, and a leveled trailer pad. The features were located on either side of Haskell Canyon Road.

Although the Project site passes through the site boundaries, none of the features were identified within the Project site itself.

In 2014, resource P-19-003131 was individually determined eligible for the National Register of Historic Places by consensus through the Section 106 process. The resource is listed in the California Register of Historical Resources.

The site forms for resource P-19-003131 are included as Attachment 3.

HISTORICAL MAPS, AERIAL PHOTOGRAPHS, AND ARCHIVES RESEARCH Michael Baker International consulted historical topographic maps, aerial imagery (NETR Online and UC Santa Barbara [UCSB]), and Bureau of Land Management, General Land Office (BLM GLO) records to gather additional information regarding past land use and disturbances and the potential presence of historic-period structures within the Project area. Below is a list of sources reviewed:
 Historicaerials.com
 Township 5 North, Range 16 West, San Bernardino Meridian Plat map (BLM 1880a)  Township 4 North, Range 16 West, San Bernardino Meridian Plat map (BLM 1880b)  Fernando, Calif. 1:62,500 topographic quadrangle (USGS 1900a)  San Fernando, Calif. 1:62,500 topographic quadrangle (USGS 1900b)  Santa Susana, Calif. 1:62,500 topographic quadrangle (USGS 1903)

MICHAEL BAKER INTERNATIONAL
Cultural Resources Identification Memorandum, Haskell Canyon Open Space Shared Access Improvements Project, City of Santa Clarita, Los Angeles County, California

M B A K E R I N T L . C O M 801 S. Grand Avenue, #250, Los Angeles, CA 90017 (213) 267-8645
13  Saugus, Calif. 1:24,000 topographic quadrangle (USGS 1929)  Saugus, Calif. 1:24,000 topographic quadrangle (USGS 1933)  San Fernando, Calif. 1:62,500 topographic quadrangle (USGS 1940)  Santa Susana, Calif. 1:62,500 topographic quadrangle (USGS 1941)  Santa Susana, Calif. 1:62,500 topographic quadrangle (USGS 1943)  Newhall, Calif. 1:24,000 topographic quadrangle (USGS 1952)  Mint Canyon, Calif. 1:24,000 topographic quadrangle (USGS 1960)  Mint Canyon, Calif. 1:24,000 topographic quadrangle (USGS 1995a)  Newhall, Calif. 1:24,000 topographic quadrangle (USGS 1995b)  Mint Canyon, Calif. 1:24,000 topographic quadrangle (USGS 2012a)  Newhall, Calif. 1:24,000 topographic quadrangle (USGS 2012b)

Results
The earliest USGS maps—Fernando 1900, San Fernando 1900, and Santa Susana 1903—show the Project area as undeveloped. Haskell Canyon has a series of dirt roads, while Deadman Canyon has a mapped roadway that connects to Dry Canyon to the southeast (USGS 1903).

The Santa Clara River lies to the south with the Southern Pacific Railroad line adjacent to its natural course. The San Gabriel Mountains are south of the Project's footprint, and the Project area sits in between the north and south portions of the Angeles National Forest (USGS 1900a, 1900b, 1903).

The 1929 Saugus topographic map depicts a power transmission line running north to south through the whole sheet, near the Project site (USGS 1929, 1933).

In 1933, two structures were mapped outside the Project area to the west and northwest, likely related to the area's cattle and hog ranching. The building directly west of the Project area had a road leading to it; however, the area remained undeveloped (USGS 1933, 1940, 1941, 1943).

The 1952 Newhall map reveals two structures east of the Project area, within the Haskell Canyon Bike Park (USGS 1952). These two structures correspond to the site boundary for CA-LAN-3132H and the historical structure foundations recorded there.

A 1952 aerial shows several structures that were likely associated with pig ranching in the area and the site of CA-LAN-3131H. The 1959 aerial shows an expansion of the pig ranching facility. In the 1969 aerial, it appears that by that time, the pig ranch had been abandoned. In the same 1969 aerial, a mining operation is also visible along Blue Cloud Road. The remnants of that operation are visible in aerial imagery up to the present day.

INTERESTED PARTIES CONSULTATION
Native American Consultation
The NAHC maintains a confidential Sacred Lands File, which contains sites of traditional, cultural, or religious value to the Native American community. The NAHC was contacted on May 18, 2026, to request a search of the Sacred Lands File for the Project site. The NAHC responded on June 3, 2026, stating, “a search of the Native American Heritage Commission (NAHC) Sacred Lands File (SLF) was completed based on the information submitted for the above referenced project. The results were

MICHAEL BAKER INTERNATIONAL
Cultural Resources Identification Memorandum, Haskell Canyon Open Space Shared Access Improvements Project, City of Santa Clarita, Los Angeles County, California

M B A K E R I N T L . C O M 801 S. Grand Avenue, #250, Los Angeles, CA 90017 (213) 267-8645
14 positive. Please contact the Fernandeno Tataviam Band of Mission Indians on the attached list for more information.” The NAHC request and response are included as Attachment 4.

ARCHAEOLOGICAL AND PALEONTOLOGICAL PEDESTRIAN SURVEY
On May 28, 2026, Michael Baker International Archaeologist Marcel Young conducted an archaeological and paleontological pedestrian survey of the Project site. The entire Project site, including the road and a 5-meter buffer, was walked over in transects spaced 15 meters or less. The purpose of the survey was to identify any resources, including archaeological resources and fossils or potentially fossiliferous sediments, located within the Project site.

Results
The Project site has been developed as a roadway at least since the early twentieth century. Ongoing road maintenance has severely disturbed the Project site. Soil is clayey sandy silt varying in colors from grayish brown, pale brown to olive brown, with inclusions of parent and imported gravels. Little native soil was observed in the vicinity of the road. Within the 5-meter buffer surveyed on either side of the road, thick vegetation including invasive grasses and other native and non-native vegetation severely obscured the ground surface, reducing visibility to less than 5 percent in much of the buffer.

No archaeological or paleontological resources were observed within the Project site, including that part of the Project site that overlaps resource P-19-003131.

PALEONTOLOGICAL SENSITIVITY ANALYSIS
The sensitivity for paleontological resources within the three-dimensional Project site is low. Fossil shell has been documented within or near the Project site, and significant vertebrate fossil localities have been recovered from similar geologic units near the Project site. There is high potential to encounter paleontological resources within undisturbed geologic contexts (i.e., undisturbed bedrock or subsurface geologic deposits in previously undisturbed areas) within the Project vicinity. However, the field survey confirmed that the Project site is highly disturbed and, in many places, covered in imported gravel. The Project, which involves grading, improving, and paving an existing roadway, is not anticipated to impact undisturbed sensitive deposits.

BURIED ARCHAEOLOGICAL SITE SENSITIVITY ANALYSIS
Archaeological sensitivity is determined based on the general presence and/or absence of Native American occupation sites, isolated prehistoric Native American artifacts and burials, and historic archival and archaeological materials exposed during various construction projects. The Project site has a low sensitivity for archaeological resources.

Roadways have been developed in Haskell Canyon since the nineteenth century, and the existing roadway topographic maps, aerial photographs, and archival records have indicated that historic- period homesteads and mining operations were established within or near the Project area during the early to mid-twentieth century. One historic-period archaeological site (P-19-003131), comprising foundation remains and refuse, has been identified within the Project area, but it does not appear to be a significant resource, and no elements of the site have been identified within the Project site itself. The soils of the Project site have been heavily impacted by the roadway’s development from the surface to unknown but significant depths.

MICHAEL BAKER INTERNATIONAL
Cultural Resources Identification Memorandum, Haskell Canyon Open Space Shared Access Improvements Project, City of Santa Clarita, Los Angeles County, California

M B A K E R I N T L . C O M 801 S. Grand Avenue, #250, Los Angeles, CA 90017 (213) 267-8645
15 Based on the archival research, soils, available resources, and pedestrian survey results, the archaeological sensitivity for potentially unknown prehistoric archaeological sites within the area of potential effect is low, and the potential for significant buried historic period resources is also considered low.

IMPACTS ANALYSIS AND RECOMMENDATIONS
Paleontological
The sensitivity for unknown, buried paleontological resources within the three-dimensional Project site is low. The Project is not anticipated to impact paleontological resources. No further work is recommended.

Archaeological
One resource that is listed in the California Register, P-19-003131, is mapped as overlapping the Project site. However, the resource represents the remnants of a hog farm that was established alongside Haskell Canyon Road, and so was deliberately placed to avoid being within the roadway. None of the features associated with the resource were mapped within the Project site, and the archaeological survey failed to identify any artifacts or features associated with the resource within the Project site. The site is eligible for the National Register of Historic Places and California Register of Historical Resources due to its data potential. The resource’s data potential will not be impacted by the Project. The Project will have no impact on the resource.

The sensitivity for unknown, buried resources within the three-dimensional Project site is low. The existing mitigation measures, cited above, are sufficient to reduce impacts to unknown resources to a less than significant level.

Tribal
No resources of Native American origin were identified within the Project site as a result of the records search, archival research, and survey. The NAHC SLF search for the project vicinity was positive, and the FTBMI were identified as potentially having information about resources of Native American significance in the vicinity of the Project site. The FTBMI were consulted during the preparation of the existing IS/MND and provided mitigation measures which were adopted. The existing mitigation measures, cited above, are sufficient to reduce impacts to unknown resources to a less than significant level.

MICHAEL BAKER INTERNATIONAL
Cultural Resources Identification Memorandum, Haskell Canyon Open Space Shared Access Improvements Project, City of Santa Clarita, Los Angeles County, California

M B A K E R I N T L . C O M 801 S. Grand Avenue, #250, Los Angeles, CA 90017 (213) 267-8645
16 PREPARER QUALIFICATIONS
This memorandum was prepared by Michael Baker International Archaeology Practice Lead, Marc Beherec, PhD, RPA. Dr. Beherec is an archaeologist who has been involved in the field of cultural resources management for nearly 25 years. He has worked throughout California on projects within federal and state regulatory frameworks, and is experienced in the identification and analysis of both prehistoric and historic era artifacts. He has worked with a variety of local, state, and federal agencies within both federal and state frameworks. He has overseen all phases of archaeological work, including Phase I cultural resources assessments, to satisfy requirements of both CEQA and the National Environmental Policy Act; Phase II eligibility testing for both the California Register and the National Register; Phase III data recovery excavations; and archaeological construction monitoring. Dr. Beherec meets the Secretary of the Interior Standards for historic and prehistoric archaeology and is certified by the Register of Professional Archaeologists.

Sincerely,
Attachments:

Attachment 1 – Figures
Attachment 2 – NHMLAC Records Search Results Letter
Attachment 3 – P-19-003131 Site Forms (Confidential)
Attachment 4 – Native American Heritage Commission correspondence

Marc A. Beherec, PhD, RPA
Archaeology Practice Lead

MICHAEL BAKER INTERNATIONAL
Cultural Resources Identification Memorandum, Haskell Canyon Open Space Shared Access Improvements Project, City of Santa Clarita, Los Angeles County, California

M B A K E R I N T L . C O M 801 S. Grand Avenue, #250, Los Angeles, CA 90017 (213) 267-8645
17 REFERENCES
BLM (Bureau of Land Management, General Land Office). 1880a. Plat Map. Township 4 North, Range 16 West, San Bernardino Meridian. https://glorecords.blm.gov/results/default.aspx?searchCriteria =type=survey|st=CA|cty=|twp_nr=4|twp_dir=N|rng_nr=16|rng_dir=W.

Campbell, R. H., C. J. Willis, P. J. Irvine, and B. J. Swanson. 2016. "Preliminary geologic map of the Los Angeles 30 minute by 60-minute quadrangle, California: Version 2.1." California Geological Survey. https://ngmdb.usgs.gov/Prodesc/proddesc_109250.htm.

Daniels, James T., Jr., and Marcel Young. 2024. Phase I Cultural Resources Assessment for the Blue Cloud Bike Park Project, Santa Clarita, Los Angeles County, California. Carlsbad, CA: Michael Baker International.

Daniels, James T., Jr. 2026. Archaeological Monitoring Report for the Haskell Canyon Bike Park Project, Santa Clarita, California. Prepared by Michael Baker International for the City of Santa Clarita.

Dibblee, T. W., and H. E. Ehrenspeck. 1996. "Geologic map of the Mint Canyon quadrangle, Los Angeles County California. Scale 1:24,000." Dibblee Geological Foundation. https://ngmdb.usgs. gov/Prodesc/proddesc_71700.htm.

HistoricAerials.com. n.d. https://historicaerials.com/

National Park Service. 2020. National Register of Historic Places. https://www.nps.gov/subjects/ nationalregister/index.htm

OHP (California Office of Historic Preservation). 1997. California Inventory of Historic Resources.

OHP (California Office of Historic Preservation). 2001a. "California Environmental Quality Act (CEQA) and Historical Resources." In Technical Assistance Series No. 1. Sacramento, CA: California Department of Parks and Recreation.

OHP (California Office of Historic Preservation). 2001b. "California Register of Historical Resources: Q&A for Local Governments." In Technical Assistance Series No. 4. Sacramento, CA: California Department of Parks and Recreation.

OHP (California Office of Historic Preservation). 2022. Archaeological Resources Directory. On file, South Central Coastal Information Center.

OHP (California Office of Historic Preservation). 2026a. California Historical Resources. https://ohp. parks.ca.gov/ListedResources/

MICHAEL BAKER INTERNATIONAL
Cultural Resources Identification Memorandum, Haskell Canyon Open Space Shared Access Improvements Project, City of Santa Clarita, Los Angeles County, California

M B A K E R I N T L . C O M 801 S. Grand Avenue, #250, Los Angeles, CA 90017 (213) 267-8645
18 OHP (California Office of Historic Preservation). 2026b. Built Environment Resources Directory for Los Angeles County.

USGS (United States Geological Survey). 1900a. Fernando, Calif. 1:62,500 scale topographic quadrangle.

USGS (United States Geological Survey). 1900b. San Fernando, Calif. 1:62,500 scale topographic quadrangle.

USGS (United States Geological Survey). 1903. Santa Susana, Calif. 1:62,500 scale topographic quadrangle.

USGS (United States Geological Survey). 1929. Saugus, Calif. 1:24,000 scale topographic quadrangle.

USGS (United States Geological Survey). 1933. Saugus, Calif. 1:24,000 scale topographic quadrangle.

USGS (United States Geological Survey). 1940. San Fernando, California. 1:24,000. Electronic resource map. https://ngmdb.usgs.gov/topoview/viewer/#.

USGS (United States Geological Survey). 1941. Santa Susana, Calif. 1:62,500 scale topographic quadrangle.

USGS (United States Geological Survey). 1943. Santa Susana, Calif. 1:62,500 scale topographic quadrangle.

USGS (United States Geological Survey). 1952. Newhall, Calif. 1:24,000 scale topographic quadrangle.

USGS (United States Geological Survey). 1960. Mint Canyon, Calif. 1:24,000 scale topographic quadrangle.

USGS (United States Geological Survey). 1995a. Mint Canyon, Calif. 1:24,000 scale topographic quadrangle.

USGS (United States Geological Survey). 1995b. Newhall, Calif. 1:24,000 scale topographic quadrangle.

USGS (United States Geological Survey). 2012a. Mint Canyon, Calif. 1:24,000 scale topographic quadrangle.

USGS (United States Geological Survey). 2012b. Newhall, Calif. 1:24,000 scale topographic quadrangle.

Attachment
1 Figures
Attachment 1
Figures
Map Detail
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Attachment 2
NHMLAC Records Search Results Letter

Research & Collections

e-mail: [email protected]

May 23, 2026

Michael Baker International
Attn: Marc Beherec

re: Expedited paleontological resources records search for the Haskell Canyon Addendum Project

Dear Marc:

I have conducted a search of our paleontology collection records for the proposed development at the Haskell Canyon Addendum project area as outlined on the portion of the Newhall USGS topographic quadrangle map that you sent to me via e-mail on May 18, 2026. The collections of the Natural History Museum of Los Angeles County (NHMLA) include fossil localities that have been recorded or georeferenced within the bounds of the project area, as shown in the table below:

Locality
Number Location Formation Taxa Depth
LACM IP 17899
Haskell Canyon, north
of Copper Hill Dr. Castaic Formation Invertebrates (primarily mollusks) Surface IP, Invertebrate Paleontology; bgs, below ground surface

Additionally, we have other localities nearby from the same sedimentary deposits that occur in the proposed project area, either at the surface or at depth, as shown in the table below:Saugus Castaic
Mint canyon

Locality Number Location Formation Taxa Depth
LACM VP 7772;
LACM IP 17900,
17901, 17902, 7758
Between Haskell Canyon
and Kathleen Ave
Castaic Formation
(very fine sands)
Carnivore (Carnivora)
and invertebrates
(primarily mollusks) Unknown
LACM VP 5461;
LACM IP 7770,
10271, 404, 7754
Ridge west of Pettinger
Canyon Rd and north of
N Rock Canyon Dr.

Castaic Formation (4
m thick shell bed)
Tapir (Tapiridae);
Invertebrates
(uncatalogued) Unknown
LACM VP 7988,
7989
Five Knolls development,
Golden Valley Rd., Santa
Clarita
Saugus Formation
(paleosol bounded by
conglomerate beds)
Numerous specimens of
rodent (Rodentia)
Unknown (collected
during grading for
housing
development)
LACM VP 6804
Saugus Elementary
School Saugus Formation Horse clade (Equidae) Surface
LACM IP 3922
South of Vasquez
Canyon Road, east of
Mint Canyon
Formation
Invertebrates
(gastropods and others) Surface
Natural History Museum
of Los Angeles County
900 Exposition Boulevard
Los Angeles, CA 90007
tel 213.763.DINO
www.nhm.orgNATURAL

HISTORY
MUSEUM

LOS ANGELESCOUNTY
Locality Number Location Formation Taxa Depth
the junction of Vasquez
Canyon Road and
Bouquet Canyon Road
LACM VP 6363,
5150, CIT566
West side of Cruzan
Mesa, north of Solemint,
Ca
Mint Canyon
Formation
Primitive horse
(Pliohippus) Unknown
VP, Vertebrate Paleontology; IP, Invertebrate Paleontology; bgs, below ground surface

This records search is limited to the records of the NHMLA. It is not intended as a paleontological assessment of the project for the purposes of California Environmental Quality Act (CEQA) or National Environmental Policy Act (NEPA). Potentially fossil-bearing units are present in the project area, either at the surface or in the subsurface. As such, NHMLA recommends that a paleontological assessment be conducted by a paleontologist meeting Federal (43 Code of Federal Regulations Part

49.110) or Society of Vertebrate Paleontology standards for compliance with applicable regulations, such as CEQA or NEPA.

Sincerely,

Alyssa Bell, Ph.D.

Natural History Museum of Los Angeles
County

OLuAaa Bae

Santa Clarita City CouncilJuly 14, 2026

Santa Clarita City Council
July 14, 2026