Agenda packet, regular meeting, first session — Aliso Viejo City Council, October 7, 2026 (part 3 of 11)

Elevation: 15–305 m
Bloom period: June–October
None: The project site has been subjected to
significant historical surface disturbances and
does not contain suitable habitat(s) that would
support occurrence of this species.

No
Lycium brevipes var. hassei
Santa Catalina Island
desert-thorn
— — 3.1 Perennial deciduous shrub found in coastal
bluff scrub and coastal scrub communities.

Elevation: 65–300 m
Bloom period: June
None: The project site has been subjected to
significant historical surface disturbances and
does not contain suitable habitat(s) that would
support occurrence of this species.

No
Lycium californicum
California box-thorn
— — 4.2 Perennial shrub found in coastal bluff scrub
and coastal scrub communities.

Elevation: 5–150 m
Bloom period: March–August
None: The project site has been subjected to
significant historical surface disturbances and
does not contain suitable habitat(s) that would
support occurrence of this species.

No
Malacothrix saxatilis var.
saxatilis
cliff malacothrix
— — 4.2 Perennial rhizomatous herb found in coastal
bluff scrub and coastal scrub communities.

Elevation: 3–200 m
Bloom period: March–September
None: The project site has been subjected to
significant historical surface disturbances and
does not contain suitable habitat(s) that would
support occurrence of this species.

No
Microseris douglasii ssp.
platycarpha
small-flowered microseris
— — 4.2 Annual herb found in clay soils in cismontane
woodland, coastal scrub, valley and foothill
grassland, and vernal pool communities.

Elevation: 15–1,070 m
Bloom period: March–May
None: The project site has been subjected to
significant historical surface disturbances and
does not contain suitable habitat(s) that would
support occurrence of this species.

No
492
CITY OF ALISO VIEJO — 1 5 ARGONAUT P ROJECT

BIOLOGICAL RESOURCES ASSESSMENT APPENDIX B
FCS
Scientific Name
Common Name
Status
Habitat Description4 Potential to Occur and Rationale5
Included in
Impact
USFWS Analysis 1 CDFW2 CNPS3
Monardella hypoleuca ssp.
intermedia
intermediate monardella
— — 1B.3 Perennial rhizomatous herb that occurs in
chaparral, cismontane woodland, and lower
montane coniferous forest communities.

Elevation: 400–1,250 m
Bloom period: April–September
None: The project site has been subjected to
significant historical surface disturbances and
does not contain suitable habitat(s) that would
support occurrence of this species. There are
three recent records between five and ten
miles from the project site.

No
Monardella macrantha ssp.
hallii
Hall's monardella
— — 1B.3 Perennial rhizomatous herb found in
broadleafed upland forest, chaparral,
cismontane woodland, lower montane
coniferous forest, and valley and foothill
grassland.

Elevation: 730–2,195 m
Bloom period: June–October
None: The project site has been subjected to
significant historical surface disturbances and
does not contain suitable habitat(s) that would
support occurrence of this species.

No
Myosurus minimus ssp.
apus
little mousetail
— — 3.1 Annual herb found in alkaline soils in valley
and foothill grassland and vernal pools.

Elevation: 20– 640 m
Bloom period: March–June
None: The project site has been subjected to
significant historical surface disturbances and
does not contain suitable habitat(s) that would
support occurrence of this species.

No
Nama stenocarpa
mud nama
— — 2B.2 Annual/perennial herb found in marshes and
swamps.

Elevation: 5–500 m
Bloom period: January–July
None: The project site has been subjected to
significant historical surface disturbances and
does not contain suitable habitat(s) that would
support occurrence of this species. There are
two historical records within five miles of the
project site and three historical records
between five and ten miles from the project
site.

No
Nasturtium gambelii
Gambel’s water cress
FE CT 1B.1 Perennial rhizomatous herb found in marshes
and swamps (brackish, freshwater).

Elevation: 5–330 m
None: The project site has been subjected to
significant historical surface disturbances and
No
493
CITY OF ALISO VIEJO — 1 5 ARGONAUT P ROJECT

BIOLOGICAL RESOURCES ASSESSMENT APPENDIX B
FCS
Scientific Name
Common Name
Status
Habitat Description4 Potential to Occur and Rationale5
Included in
Impact
USFWS Analysis 1 CDFW2 CNPS3
Bloom period: April–October does not contain suitable habitat(s) that would support occurrence of this species.

Navarretia prostrata
prostrate vernal pool
navarretia
— — 1B.2 Annual herb found in mesic, alkaline soils in
coastal scrub, meadows and seeps, valley
and foothill grassland, and vernal pool
communities.

Elevation: 3–1,210 m
Bloom period: April–July
None: The project site has been subjected to
significant historical surface disturbances and
does not contain suitable habitat(s) that would
support occurrence of this species. There is
one historical record within five miles of the
project site.

No
Nemacaulis denudata var.
denudata
coast woolly-heads
— — 1B.2 Annual herb found in coastal dunes.

Elevation: 0–100 m
Bloom period: April–September
None: The project site has been subjected to
significant historical surface disturbances and
does not contain suitable habitat(s) that would
support occurrence of this species. There is
one recent and one historical record within
five miles of the project site and two historical
records between five and ten miles from the
project site.

No
Pentachaeta aurea ssp.
allenii
Allen’s pentachaeta
— — 1B.1 Annual herb found in openings in coastal
scrub and valley and foothill grassland
communities.

Elevation: 75–520 m
Bloom period: March–June
None: The project site has been subjected to
significant historical surface disturbances and
does not contain suitable habitat(s) that would
support occurrence of this species. There are
three historical records within five miles of the
project site and three historical records
between five and ten miles from the project
site.

No
Pentachaeta aurea ssp.
aurea
golden-rayed pentachaeta
— — 4.2 Annual herb found in chaparral, cismontane
woodland, coastal scrub, lower montane
coniferous forest, riparian woodland, and
valley and foothill grassland communities.

None: The project site has been subjected to
significant historical surface disturbances and
does not contain suitable habitat(s) that would
support occurrence of this species.

No
494
CITY OF ALISO VIEJO — 1 5 ARGONAUT P ROJECT

BIOLOGICAL RESOURCES ASSESSMENT APPENDIX B
FCS
Scientific Name
Common Name
Status
Habitat Description4 Potential to Occur and Rationale5
Included in
Impact
USFWS Analysis 1 CDFW2 CNPS3
Elevation: 80–1,850 m
Bloom period: March–July
Phacelia hubbyi
Hubby's phacelia
— — 4.2 Annual herb found in gravelly, rocky, and
talus soils in chaparral, coastal scrub, and
valley and foothill grassland.

Elevation: 0–1,000 m
Bloom period: April–July
None: The project site has been subjected to
significant historical surface disturbances and
does not contain suitable habitat(s) that would
support occurrence of this species.

No
Phacelia keckii
Santiago Peak phacelia
— — 1B.3 Annual herb found in closed-cone coniferous
forest and chaparral communities.

Elevation: 545–1,600 m
Bloom period: May–July
None: The project site has been subjected to
significant historical surface disturbances and
does not contain suitable habitat(s) that would
support occurrence of this species.

No
Phacelia ramosissima var.
austrolitoralis
south coast branching
phacelia
— — 3.2 Perennial herb found in rocky (sometimes)
and sandy soils in chaparral, coastal dunes,
coastal scrub, and marshes and swamps
(coastal salt).

Elevation: 5–300 m
Bloom period: March–August
None: The project site has been subjected to
significant historical surface disturbances and
does not contain suitable habitat(s) that would
support occurrence of this species.

No
Pseudognaphalium
leucocephalum
white rabbit-tobacco
— — 2B.2 Perennial herb found in gravelly and sandy
soils in chaparral, cismontane woodland,
coastal scrub, and riparian woodland
communities.

Elevation: 0–2,100 m
Bloom period: August–November
None: The project site has been subjected to
significant historical surface disturbances and
does not contain suitable habitat(s) that would
support occurrence of this species. There is
one historical record within five miles of the
project site and three recent and two
historical records between five and ten miles
from the project site.

No
Quercus dumosa
Nuttall’s scrub oak

CONCCP/
HCP

CONCCP/
HCP
1B.1 Perennial evergreen shrub found in clay,
loam, and sandy soils in closed-cone
None: The project site has been subjected to
significant historical surface disturbances and
does not contain suitable habitat(s) that would
No
495
CITY OF ALISO VIEJO — 1 5 ARGONAUT P ROJECT

Elevation: 15–400 m
Bloom period: February–April
support occurrence of this species. There is
one historical record within five miles of the
project site and three recent and five
historical records between five and ten miles
from the project site.

Quercus engelmannii
Engelmann oak
— — 4.2 Perennial deciduous tree found in chaparral,
cismontane woodland, riparian woodland, and
valley and foothill grassland communities.

Elevation: 50–1,300 m
Bloom period: March–June
None: The project site has been subjected to
significant historical surface disturbances and
does not contain suitable habitat(s) that would
support occurrence of this species.

No
Rhinotropis cornuta var.
fishiae
Fish's milkwort
— — 4.3 Perennial deciduous shrub found in
chaparral, cismontane woodland, and riparian
woodland communities.

Elevation: 100–1,000 m
Bloom period: May–August
None: The project site has been subjected to
significant historical surface disturbances and
does not contain suitable habitat(s) that would
support occurrence of this species.

No
Romneya coulteri
Coulter's matilija poppy

CONCCP/
HCP

4.2 Perennial, rhizomatous herb found in
chaparral and coastal scrub, often in burned
areas.

Elevation: 20–1,200 m
Bloom period: March–July
None: The project site has been subjected to
significant historical surface disturbances and
does not contain suitable habitat(s) that would
support occurrence of this species.

No
Senecio aphanactis
chaparral ragwort
— — 2B.2 Annual herb found in drying alkaline flats
(usually) in chaparral, cismontane woodland,
and coastal scrub communities.

Elevation: 15–800 m
Bloom period: January–April
None: The project site has been subjected to
significant historical surface disturbances and
does not contain suitable habitat(s) that would
support occurrence of this species. There are
three historical records between five and ten
miles from the project site.

No
Sidalcea neomexicana
salt spring checkerbloom
— — 2B.2 Perennial herb found in playas and in
alkaline, mesic soils in chaparral, coastal
None: The project site has been subjected to
significant historical surface disturbances and
No
496
CITY OF ALISO VIEJO — 1 5 ARGONAUT P ROJECT

Elevation: 15–1,500 m
Bloom period: March–June
does not contain suitable habitat(s) that would
support occurrence of this species. There is
one recent and one historical record between
five and ten miles from the project site.

Suaeda esteroa
estuary seablite
— — 1B.2 Perennial herb found in marshes and swamps
(coastal salt).

Elevation: 0–5 m
Bloom period: July–October
None: The project site has been subjected to
significant historical surface disturbances and
does not contain suitable habitat(s) that would
support occurrence of this species. There are
two recent and one historical record between
five and ten miles from the project site.

No
Suaeda taxifolia
woolly seablite
— — 4.2 Perennial evergreen shrub found in coastal
bluff scrub, coastal dunes, and marshes and
swamps (coastal margins).

Elevation: 0–50 m
Bloom period: January–December
None: The project site has been subjected to
significant historical surface disturbances and
does not contain suitable habitat(s) that would
support occurrence of this species.

No
Symphyotrichum defoliatum
San Bernardino aster
— — 1B.2 Perennial, rhizomatous herb found in banks
of ditches, streams, and springs in
cismontane woodlands, coastal scrub, lower
montane coniferous forests, meadows and
seeps, marshes and swamps, and vernally
mesic valley and foothill grassland
communities.

Elevation: 2–2,040 m
Bloom period: July–November
None: The project site has been subjected to
significant historical surface disturbances and
does not contain suitable habitat(s) that would
support occurrence of this species. There are
two historical records between five and ten
miles from the project site.

No
Verbesina dissita
big-leaved crownbeard
FT CT 1B.1 Perennial herb found in chaparral (maritime) and coastal scrub communities.

Elevation: 45–205 m
Bloom period: April–July
None: The project site has been subjected to
significant historical surface disturbances and
does not contain suitable habitat(s) that would
support occurrence of this species. There is
No
497
CITY OF ALISO VIEJO — 1 5 ARGONAUT P ROJECT

BIOLOGICAL RESOURCES ASSESSMENT APPENDIX B
FCS
Scientific Name
Common Name
Status
Habitat Description4 Potential to Occur and Rationale5
Included in
Impact
USFWS Analysis 1 CDFW2 CNPS3
one recent record within five miles of the
project site and one recent record between
five and ten miles from the project site.

Ferns
Asplenium vespertinum
western spleenwort
— — 4.2 Perennial, rhizomatous herb found in rocky
areas in chaparral, cismontane woodland,
and coastal scrub.

Elevation: 180–1,000 m
Bloom period: February–June
None: The project site has been subjected to
significant historical surface disturbances and
does not contain suitable habitat(s) that would
support occurrence of this species.

No
Gymnosperms
Hesperocyparis forbesii
Tecate cypress

CONCCP/
HCP

CONCCP/
HCP
1B.1 Perennial, evergreen tree found in clay and
gabbroic (sometimes) soils in closed-cone
coniferous forest and chaparral communities.

Elevation: 80–1,500 m
None: The project site has been subjected to
significant historical surface disturbances and
does not contain suitable habitat(s) that would
support occurrence of this species.

No
Lycophytes
Selaginella cinerascens
ashy spike-moss
— — 4.1 Perennial rhizomatous herb found in
chaparral and coastal scrub communities.

Elevation: 20–640 m
None: The project site has been subjected to
significant historical surface disturbances and
does not contain suitable habitat(s) that would
support occurrence of this species.

No
Monocots
Brodiaea filifolia
thread-leaved brodiaea
FT CE 1B.1 Perennial, bulbiferous herb found in clay soils in chaparral (openings), cismontane
woodland, coastal scrub, playas, valley and
foothill grassland, and vernal pools.

Elevation: 25–1,120 m
Bloom period: March–June
None: The project site has been subjected to
significant historical surface disturbances and
does not contain suitable habitat(s) that would
support occurrence of this species. There is
one recent and one historical record within
five miles of the project site and five recent
No
498
CITY OF ALISO VIEJO — 1 5 ARGONAUT P ROJECT

Calochortus plummerae
Plummer's mariposa-lily
— — 4.2 Perennial, bulbiferous herb found in granitic
and rocky soils in chaparral, cismontane
woodland, coastal scrub, lower montane
coniferous forest, and valley and foothill
grassland communities.

Elevation: 100– 1,700 m
Bloom period: May–July
None: The project site has been subjected to
significant historical surface disturbances and
does not contain suitable habitat(s) that would
support occurrence of this species.

No
Calochortus weedii var.
intermedius
intermediate mariposa-lily

CONCCP/
HCP

CONCCP/
HCP
1B.2 Perennial, bulbiferous herb that occurs in
calcareous soils on rocky sites in coastal
scrub, chaparral, and valley and foothill
grassland communities.

Elevation: 105–855 m
Bloom period: May–July
None: The project site has been subjected to
significant historical surface disturbances and
does not contain suitable habitat(s) that would
support occurrence of this species. There are
twelve recent and nine historical records
within five miles of the project site and 36
recent and sixteen historical records between
five and ten miles from the project site.

No
Hordeum intercedens
vernal barley
— — 3.2 Annual herb found in vernal pools and
depressions and saline flats in coastal dunes,
coastal scrub, and valley and foothill
grassland communities.

Elevation: 5–1,000 m
Bloom period: March–June
None: The project site has been subjected to
significant historical surface disturbances and
does not contain suitable habitat(s) that would
support occurrence of this species.

No
Imperata brevifolia
California satintail
— — 2B.1 Perennial rhizomatous herb found in mesic
soils in chaparral, coastal scrub, Mojavean
desert scrub, meadows and seeps (often
alkali), and riparian scrub.

Elevation: 0–1,215 m
None: The project site has been subjected to
significant historical surface disturbances and
does not contain suitable habitat(s) that would
support occurrence of this species. There is
No
499
CITY OF ALISO VIEJO — 1 5 ARGONAUT P ROJECT

BIOLOGICAL RESOURCES ASSESSMENT APPENDIX B
FCS
Scientific Name
Common Name
Status
Habitat Description4 Potential to Occur and Rationale5
Included in
Impact
USFWS Analysis 1 CDFW2 CNPS3
Bloom period: September–May one historical record between five and ten miles from the project site.

Juncus acutus ssp.
leopoldii
southwestern spiny rush
— — 4.2 Perennial, rhizomatous herb found in mesic
soils in coastal dunes, meadows and alkaline
seeps and coastal salt marshes and swamps.

Elevation: 3–900 m
Bloom period: May–June
None: The project site has been subjected to
significant historical surface disturbances and
does not contain suitable habitat(s) that would
support occurrence of this species.

No
Lilium humboldtii ssp.
ocellatum
ocellated Humboldt lily
— — 4.2 Perennial, bulbiferous herb found in openings
in chaparral, cismontane woodland, coastal
scrub, lower montane coniferous forest, and
riparian woodland communities.

Elevation: 30–1,800 m
Bloom period: March–July
None: The project site has been subjected to
significant historical surface disturbances and
does not contain suitable habitat(s) that would
support occurrence of this species.

No
Nolina cismontana
chaparral nolina
— — 1B.2 Perennial, evergreen shrub occurring in
gabbroic soils and sandstone (sometimes) in
chaparral and coastal scrub communities.

Elevation: 140–1,275 m
Bloom period: May–July
None: The project site has been subjected to
significant historical surface disturbances and
does not contain suitable habitat(s) that would
support occurrence of this species. There are
six recent and two historical records between
five and ten miles from the project site.

No
Orcuttia californica
California Orcutt grass
FE CE 1B.1 Annual herb found in vernal pools.

Elevation: 15–660 m
Bloom period: April–August
None: The project site has been subjected to
significant historical surface disturbances and
does not contain suitable habitat(s) that would
support occurrence of this species.

No
Piperia cooperi
chaparral rein orchid
— — 4.2 Perennial herb found in chaparral,
cismontane woodland, and valley and foothill
grassland.

Elevation: 15–1,585 m
Bloom period: March–June
None: The project site has been subjected to
significant historical surface disturbances and
does not contain suitable habitat(s) that would
support occurrence of this species.

No
500
CITY OF ALISO VIEJO — 1 5 ARGONAUT P ROJECT

BIOLOGICAL RESOURCES ASSESSMENT APPENDIX B
FCS
Scientific Name
Common Name
Status
Habitat Description4 Potential to Occur and Rationale5
Included in
Impact
USFWS Analysis 1 CDFW2 CNPS3
Piperia leptopetala
narrow-petaled rein orchid
— — 4.3 Perennial herb found in cismontane
woodland, lower montane coniferous forest,
and upper montane coniferous forest.

Elevation: 380–2,225 m
Bloom period: May–July
None: The project site has been subjected to
significant historical surface disturbances and
does not contain suitable habitat(s) that would
support occurrence of this species.

No
Code Designations
1 Federal Status: 2026 USFWS Listing 2 State Status: 2026 CDFW Listing 3 CNPS: 2026 CNPS Listing FE = Listed as endangered under Federal
Endangered Species Act (FESA)
FT = Listed as threatened under FESA
FC = Candidate for listing (threatened or
endangered) under FESA
FD = Delisted in accordance with FESA
FPD = Federally Proposed to be Delisted
— = Not federally listed
SE = Listed as endangered under California
Endangered Species Act (CESA)
ST = Listed as threatened under CESA
SC = Candidate for listing (threatened or endangered)
under CESA
CR = Rare in California
— = Not State listed
Rank 1A = Plants species that presumed extinct in
California.

Rank 1B = Plant species that are rare, threatened, or
endangered in California and elsewhere.

Rank 2 = Plant species that are rare, threatened, or
endangered in California, but more common
elsewhere.

Rank 3 = Plants about which we need more
information—A Review List
Rank 4 = Plants of limited distribution—A Watch List
CBR = Considered But Rejected
Blooming period: Months in parentheses are
uncommon.

Notes:
4 Habitat Description: Habitat description adapted from CNDDB and CNPS online inventory or other specified source. 5 Potential to Occur and Rationale: Location of recorded species occurrences determined by geospatial information from BIOS 6 or other specified source.

Sources:

California Department of Fish and Wildlife (CDFW). 2026. CNDDB RareFind 5 California Natural Diversity Database Query for Special-Status Species. Website:
https://map.dfg.ca.gov/rarefind/view/RareFind.aspx. Accessed April 14, 2026. 501
CITY OF ALISO VIEJO — 1 5 ARGONAUT P ROJECT

BIOLOGICAL RESOURCES ASSESSMENT APPENDIX B
FCS
Scientific Name
Common Name
Status
Habitat Description4 Potential to Occur and Rationale5
Included in
Impact
USFWS Analysis 1 CDFW2 CNPS3
California Native Plant Society (CNPS). 2026. California Native Plant Society Rare and Endangered Plant Inventory. Website: http://www.rareplants.cnps.org/. Accessed April 14, 2026.

California Department of Fish and Wildlife (CDFW). 2026. Biogeographic Information and Observation System (BIOS 6). Website: https://map.dfg.ca.gov/bios/. Accessed April 14, 2026.
502
CITY OF ALISO VIEJO — 1 5 ARGONAUT P ROJECT

BIOLOGICAL RESOURCES ASSESSMENT APPENDIX B
FCS
Table 2: Special-status Wildlife Species Potentially Occurring within the Project Scientific Name
Common Name
Status
Habitat Description3 Potential to Occur and Rationale4
Included in
Impact
USFWS Analysis 1 CDFW2
Insects
Bombus crotchii
Crotch bumble bee
— SC This species occurs primarily in California,
including coastal habitats, western Mojave Desert,
San Joaquin Valley, and adjacent foothills through
most of southwestern California. It inhabits arid
grasslands and shrublands, and its food sources
including milkweeds, pincushions, lupines, clovers,
phacelias, sages, clarkias, poppies, and
buckwheats.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There is one recent and one historical
record within five miles of the project site and five
recent records between five and ten miles from
the project site.

No
Bombus pensylvanicus
American bumble bee
— — Occurs in coastal prairie, Great Basin grassland,
and valley & foothill grassland communities. Nests
above ground under long grass or underground.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There are 14 recent and two historical
records within five miles of the project site and 44
recent and six historical records between five
and ten miles from the project site.

No
Cicindela hirticollis gravida
sandy beach tiger beetle
— — Occurs in coastal dunes adjacent to non-brackish
water along the coast of California from San
Francisco Bay to northern Mexico.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There is one historical record between
five and ten miles from the project site. This
species is believed to be locally extirpated.

No
Cicindela latesignata
western beach tiger beetle
— — Occurs in mudflats and beaches of coastal
estuaries from San Diego County to Los Angeles
County. Typically inhabit wet or dry sandy beaches
and mud, sand, or salt flats.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There are two historical records
between five and ten miles from the project site.

No
503
CITY OF ALISO VIEJO — 1 5 ARGONAUT P ROJECT

BIOLOGICAL RESOURCES ASSESSMENT APPENDIX B
FCS
Scientific Name
Common Name
Status
Habitat Description3 Potential to Occur and Rationale4
Included in
Impact
USFWS Analysis 1 CDFW2
Coelus globosus
globose dune beetle
— — Occurs in coastal sand dune habitat. Inhabits
foredunes and sand hummocks; burrows beneath
the sand surface and is most common beneath
dune vegetation.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There is one historical record between
five and ten miles from the project site.

No
Danaus plexippus
monarch butterfly
(California overwintering
population)
FC — Occurs in temperate climates, such as eastern and
western North America and undergoes longdistance migration. Lays eggs on obligate milkweed host plant (primarily Asclepias spp.). Roosts
located in wind protected Eucalyptus, Monterey
pine, and Cypress tree groves with nectar and
water sources nearby
None: The project site does not contain suitable
overwintering habitat or the obligate host plant
that would support occurrence of this species.

No
Habroscelimorpha gabbii
western tidal-flat tiger
beetle
— — Occurs in estuaries and mudflats along the coast of Southern California. Generally found on darkcolored mud in the lower zone; occasionally found on dry saline flats of estuaries.

No
Mollusks
Tryonia imitator
mimic tryonia (=California
brackishwater snail)
— — Occurs in coastal lagoons, estuaries and salt
marshes, from Sonoma County south to San Diego
County. Found only in permanently submerged
areas in a variety of sediment types; able to
withstand a wide range of salinities.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There is one historical record between
five and ten miles from the project site.

No
Crustaceans
Branchinecta
sandiegonensis
San Diego fairy shrimp
FE

CONCCP/
HCP
CONCCP
/HCP
Small, shallow (5-30 cm deep) vernal pools with
cool water (10-20ºC), moderate alkalinity and
conductivity, and less than 1 m deep.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There is one recent and two historical
No
504
CITY OF ALISO VIEJO — 1 5 ARGONAUT P ROJECT

Streptocephalus woottoni
Riverside fairy shrimp
FE

CONCCP/
HCP
CONCCP
/HCP
Vernal pools on the Santa Rosa Plateau on
Murrieta stony clay loams, Las Posas series,
Wyman clay loam, and Willows soils.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There are three recent and six historical
records between five and ten miles from the
project site.

No
Fish
Eucyclogobius newberryi
tidewater goby
FE SSC Occurs in shallow lagoons and lower stream
reaches with fairly still but not stagnant water and
high oxygen levels.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There is one historical record within five
miles of the project site and one historical record
between five and ten miles from the project site.

No
Gila orcuttii
arroyo chub
— SSC Native to the streams and rivers of the Los Angeles plain in Southern California. Arroyo chub are
adapted to survive in streams that fluctuate
between large winter storm flows, and low summer
flows, and the low dissolved oxygen and wide
temperature fluctuations. Feeds on plants such as
algae and water fern, as well as insects and
mollusks.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There are two historical records within
five miles of the project site and four historical
records between five and ten miles from the
project site.

No
Oncorhynchus mykiss
irideus pop. 10
steelhead-southern
California DPS
FE SC Occurs in Pacific coast streams, including the
Santa Ana River.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There is one historical record within five
miles of the project site and one recent and one
historical record between five and ten miles from
the project site.

No
505
CITY OF ALISO VIEJO — 1 5 ARGONAUT P ROJECT

BIOLOGICAL RESOURCES ASSESSMENT APPENDIX B
FCS
Scientific Name
Common Name
Status
Habitat Description3 Potential to Occur and Rationale4
Included in
Impact
USFWS Analysis 1 CDFW2
Rhinichthys gabrielino
Santa Ana speckled dace
— SSC Occurs in small springs, streams, large rivers, and deep lakes, including headwaters of the Santa Ana
and San Gabriel Rivers.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There are two historical records
between five and ten miles from the project site.

No
Amphibians
Anaxyrus californicus
arroyo toad
FE

CONCCP/
HCP
SSC
CONCCP
/HCP
Occurs in washes, arroyos, sandy riverbanks,
riparian areas with willows, sycamores, oaks,
cottonwoods. Requires exposed sandy streamsides
with stable terraces for burrowing with scattered
vegetation for shelter, and areas of quiet water or
pools free of predatory fishes with sandy or gravel
bottoms without silt for breeding.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There is one historical record between
five and ten miles from the project site.

No
Spea hammondii
western spadefoot

CONCCP/
HCP
SSC
CONCCP
/HCP
Occurs in open areas with sandy or gravelly soils in
mixed woodlands, grasslands, coastal sage and
Riversidean alluvial fan sage scrub, chaparral,
sandy washes, lowlands, river floodplains, alluvial
fans, playas, alkali flats, foothills, and mountains.

Breeds in ephemeral rain pools that do not contain
bullfrogs, fish, or crayfish.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There are eight recent and seven
historical records within five miles of the project
site and seventeen recent and fifteen historical
records between five and ten miles from the
project site.

No
Reptiles
Actinemys pallida
southwestern pond turtle
— SSC Occurs in ponds, lakes, rivers, streams, creeks,
marshes, and irrigation ditches with abundant
vegetation, and either rocky or muddy bottoms, in
woodland, forest, and grassland. In streams,
prefers pools to shallower areas. Logs, rocks,
cattail mats, and exposed banks are required for
basking. May enter brackish water and even
seawater.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There are one recent and six historical
records within five miles of the project site and
one recent and eight historical records between
five and ten miles from the project site.

No
506
CITY OF ALISO VIEJO — 1 5 ARGONAUT P ROJECT

BIOLOGICAL RESOURCES ASSESSMENT APPENDIX B
FCS
Scientific Name
Common Name
Status
Habitat Description3 Potential to Occur and Rationale4
Included in
Impact
USFWS Analysis 1 CDFW2
Anniella stebbinsi
southern California legless
lizard
— SSC Occurs in moist, loose soil in coastal sand dunes and a variety of interior habitats, including sandy
washes and alluvial fans. Tolerant of disturbances.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There is one historical record within five
miles of the project site and one recent and one
historical record between five and ten miles from
the project site.

No
Arizona elegans
occidentalis
California glossy snake
— SSC Occurs in areas of rocky washes and loose, sandy
soils and for burrowing in desert scrub grassland,
coastal sage and Riversidean alluvial fan sage
scrub, and chaparral habitats. Prefer open sandy
areas with scattered brush, but also found in rocky
areas.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There are two historical records within
five miles of the project site and one historical
record between five and ten miles from the
project site.

No
Aspidoscelis hyperythra
orange-throated whiptail

CONCCP/
HCP
WL
CONCCP
/HCP
Occurs primarily on coarse soils in open coastal
sage and Riversidean alluvial fan sage scrub
habitat.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There is one recent and six historical
records within five miles of the project site and
five recent and ten historical records between
five and ten miles from the project site.

No
Aspidoscelis tigris
stejnegeri
San Diegan (coastal)
whiptail

CONCCP/H
CP
SSC
CONCCP
/HCP
Occurs in dry, open areas with sparse foliage in
coastal sage and Riversidean alluvial fan sage
scrub, chaparral, woodland, and riparian habitats.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There is one historical record within five
miles of the project site and one recent and one
historical record between five and ten miles from
the project site.

No
Crotalus ruber
red-diamond rattlesnake

CONCCP/
HCP
SSC
CONCCP
/HCP
Occurs in arid, rocky areas in creosote scrub,
coastal sage and Riversidean alluvial fan sage
scrub, chaparral, oak and pine woodlands,
grasslands, on cultivated areas.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There are two historical records within
five miles of the project site and four historical
No
507
CITY OF ALISO VIEJO — 1 5 ARGONAUT P ROJECT

Phrynosoma blainvillii
coast horned lizard

CONCCP/
HCP
SSC
CONCCP
/HCP
Occurs in open areas with sandy soil and low
vegetation in grasslands, coniferous forests,
woodlands, and chaparral.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There are six historical records within
five miles of the project site and one recent and
twelve historical records between five and ten
miles from the project site.

No
Salvadora hexalepis
virgultea
coast patch-nosed snake
— SSC Occurs in brushy or shrubby vegetation. Dependent on small mammal burrows.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There is one historical record between
five and ten miles from the project site.

No
Thamnophis hammondii
two-striped gartersnake
— SSC Occurs in or near permanent fresh water in
marshes and swamps, riparian scrub, riparian
woodlands, and wetlands.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There is one recent and one historical
record within five miles of the project site and two
historical records between five and ten miles
from the project site.

No
Birds
Agelaius tricolor
tricolored blackbird

MBTA FT
SSC
FGC
Occurs and nests in large freshwater marshes with
dense stands of hydrophytic vegetation (cattails,
bulrushes, etc.). Short-distance migrant.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There are four historical records within
five miles of the project site and one recent and
five historical records between five and ten miles
from the project site.

No
Aimophila ruficeps
canescens

MBTA WL
FGC
Occurs and nests on steep, often rocky hillsides
with grass and forb patches in coastal sage and
None: The project site does not contain suitable
habitat(s) that would support occurrence of this
No
508
CITY OF ALISO VIEJO — 1 5 ARGONAUT P ROJECT

BIOLOGICAL RESOURCES ASSESSMENT APPENDIX B
FCS
Scientific Name
Common Name
Status
Habitat Description3 Potential to Occur and Rationale4
Included in
Impact
USFWS Analysis 1 CDFW2
southern California rufouscrowned sparrowCONCCP/
HCP
CONCCP
/HCP
Riversidean alluvial fan sage scrub and sparse
mixed chaparral habitats. Year-round resident in
southern California.
species. There are fourteen historical records
within five miles of the project site and four
recent and six historical records between five
and ten miles from the project site.

Ammodramus savannarum
grasshopper sparrow
MBTA SSC Occurs and nests in dense grasslands on rolling hills, lowland plains, in valleys and on hillsides on
lower mountain slopes.

No
Anarhynchus nivosus
nivosus
western snowy plover
FT
MBTA
SSC Occurs in sandy beaches, salt pond levees and
shores of large alkali lakes. Needs sandy, gravelly
or friable soils for nesting.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There is one recent record between five
and ten miles from the project site.

No
Aquila chrysaetos
golden eagle
BGEPA
MBTA

CONCCP/
HCP
FP
WL
CONCCP
/HCP
Forages in areas of rolling foothills, mountainous
areas, sage-juniper flats, and desert. Cliff-walled
canyons provide nesting habitat in most parts of
range; also, large trees in open areas.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There is one record between five and
ten miles from the project site.

No
Asio otus
long-eared owl

MBTA FP
FGC
Occurs and nests in conifer, oak, riparian, pinyonjuniper, and desert woodlands that are either open or are adjacent to grasslands, meadows, or
shrublands.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There are four historical records
between five and ten miles from the project site.

No
Athene cunicularia
burrowing owl

MBTA SSC
FGC
Occurs and nests in open, dry annual or perennial
grasslands, deserts, and scrublands characterized
by low-growing vegetation. A subterranean nester,
dependent upon burrowing mammals, most notably
the California ground squirrel. Short-distance
migrant.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There is one historical record within five
miles of the project site and four recent and three
historical records between five and ten miles
from the project site.

No
509
CITY OF ALISO VIEJO — 1 5 ARGONAUT P ROJECT

BIOLOGICAL RESOURCES ASSESSMENT APPENDIX B
FCS
Scientific Name
Common Name
Status
Habitat Description3 Potential to Occur and Rationale4
Included in
Impact
USFWS Analysis 1 CDFW2
Buteo regalis
ferruginous hawk
MBTA WL Occurs in grassland and arid shrublands with an abundance of prey species, such as pocket
gophers, black-tailed jackrabbits, and desert
cottontails. Will winter near cultivated fields that
have an abundance of pocket gophers.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There are two historical records
between five and ten miles from the project site.

No
Campylorhynchus
brunneicapillus
sandiegensis
coastal cactus wren
MBTA

CONCCP/
HCP
SSC
FGC
CONCCP
/HCP
Occurs and nests in coastal sage scrub. Requires
tall opuntia cactus or Yucca trees for nesting and
roosting.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There are ten historical records within
five miles of the project site and five recent and
32 historical records between five and ten miles
from the project site.

No
Circus hudsonius
northern harrier
MBTA

CONCCP/H
CP
SSC
BCC
CONCCP
/HCP
Frequents meadows, grasslands, open rangelands,
freshwater emergent wetlands; uncommon in
wooded habitats.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There is one historical record between
five and ten miles from the project site.

No
Coturnicops
noveboracensis
yellow rail

MBTA SSC
FGC
Occurs in shallow marshes and wet meadows. In
winter, this species inhabits drier fresh-water and
brackish marshes, as well as dense, deep grass,
and rice fields.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There is one historical record between
five and ten miles from the project site.

No
Elanus leucurus
white-tailed kite

MBTA FP
FGC
Occurs and nests in grasslands and open coastal
scrub in coastal and valley lowlands; rarely found
away from agricultural areas. Inhabits herbaceous,
open stages of most habitats mostly in cismontane
California. Year-round resident in southern
California.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There are six recent records within five
miles of the project site and thirteen recent and
one historical records between five and ten miles
from the project site.

No
Empidonax traillii extimus
southwestern willow
flycatcher
FE
MBTA
SE
CONCCP
/HCP
Occurs and nests in dense riparian woodlands.

Long-distance migrant.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There is one recent and two historical
No
510
CITY OF ALISO VIEJO — 1 5 ARGONAUT P ROJECT

BIOLOGICAL RESOURCES ASSESSMENT APPENDIX B
FCS
Scientific Name
Common Name
Status
Habitat Description3 Potential to Occur and Rationale4
Included in
Impact
USFWS Analysis 1 CDFW2

CONCCP/H
CP
records between five and ten miles from the
project site.

Eremophila alpestris actia
California horned lark

MBTA WL
FGC
Occurs and nests in open areas with sparse
vegetation. Year-round resident in southern
California.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There are three historical records within
five miles of the project site and two historical
records between five and ten miles from the
project site.

No
Icteria virens
yellow-breasted chat

MBTA SSC
FGC
Occurs and nests in riparian thickets of willow and
other bushy tangles near watercourses. Longdistance migrant.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There is one recent and one historical
record within five miles of the project site and
three historical records between five and ten
miles from the project site.

No
Laterallus jamaicensis
coturniculus
California black rail

MBTA ST
FP
FGC
Occurs and nests in freshwater marshes, wet
meadows, and shallow margins of saltwater
marshes bordering larger bays. Needs water
depths of about 1 inch that do not fluctuate during
the year and dense vegetation for nesting habitat.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There is one historical record between
five and ten miles from the project site.

No
Pandion haliaetus
osprey
MBTA WL Occurs in ocean shore, bays, freshwater lakes, and larger streams.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There is one recent record between five
and ten miles from the project site.

No
Passerculus sandwichensis
beldingi
Belding’s savannah
sparrow
MBTA SE Occurs in coastal wetlands and marshes. None: The project site does not contain suitable habitat(s) that would support occurrence of this
species. There is one recent record within five
miles of the project site and one historical record
between five and ten miles from the project site.

No
511
CITY OF ALISO VIEJO — 1 5 ARGONAUT P ROJECT

CONCCP/
HCP
SSC
FGC
CONCCP
/HCP
Occurs and nests in arid washes, on mesas, and
slopes in coastal sage scrub below 2,500 ft. Yearround resident in California.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There are 44 recent and twelve
historical records within five miles of the project
site and 83 recent and 49 historical records
between five and ten miles from the project site.

No
Rallus obsoletus levipes
light-footed Ridgway's rail
FE
MBTA
SE
FP
Occurs in salt marshes traversed by tidal sloughs,
where cordgrass and pickleweed (required for
nesting or escape cover) are the dominant
vegetation.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There are two recent records between
five and ten miles from the project site.

No
Setophaga petechia
yellow warbler

MBTA SSC
FGC
Occurs and nests in willow shrubs and thickets,
cottonwoods, sycamores, ash, and alders,
predominantly in riparian habitats. Long-distance
migrant.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There is one recent record within five
miles of the project site and one recent record
between five and ten miles from the project site.

No
Sternula antillarum browni
California least tern
FE
MBTA
SE
FP
Occurs and nests on bare or sparsely vegetated,
flat substrates: sand beaches, alkali flats, land fills, or paved areas.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There is one recent and one historical
record between five and ten miles from the
project site.

No
Vireo bellii pusillus
least Bell’s vireo
FE
MBTA

CONCCP/
HCP
SE
CONCCP
/HCP
Occurs and nests in low riparian habitat in the
vicinity of water or in dry river bottoms. Longdistance migrant.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There are ten recent and one historical
records within five miles of the project site and 22
recent and five historical records between five
and ten miles from the project site.

No
512
CITY OF ALISO VIEJO — 1 5 ARGONAUT P ROJECT

BIOLOGICAL RESOURCES ASSESSMENT APPENDIX B
FCS
Scientific Name
Common Name
Status
Habitat Description3 Potential to Occur and Rationale4
Included in
Impact
USFWS Analysis 1 CDFW2
Mammals
Antrozous pallidus
pallid bat
— SSC Occurs in deserts, grasslands, shrublands,
woodlands, and forests. Most common in open, dry
habitats with rocky areas for roosting. Roosts must
protect bats from high temperatures. Species is
very sensitive to disturbance of roosting sites.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There are two historical records
between five and ten miles from the project site.

No
Chaetodipus californicus
femoralis
Dulzura pocket mouse
— — Occurs in coastal scrub, chaparral and grassland in San Diego County.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There is one historical record between
five and ten miles from the project site.

No
Chaetodipus fallax fallax
northwestern San Diego
pocket mouse
— SSC Occurs in sandy, herbaceous areas, usually in
association with rocks or coarse gravel, in coastal
sage and Riversidean alluvial fan sage scrub,
chaparral, and grasslands.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There is one recent record between five
and ten miles from the project site.

No
Eumops perotis californicus
western mastiff bat
— SSC Occurs in many open, semi-arid to arid habitats,
including conifer and deciduous woodlands, coastal
scrub, grasslands, chaparral. Roosts in crevices in
cliff faces, high buildings, trees, and tunnels.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There are four historical records within
five miles of the project site and five records
between five and ten miles from the project site.

No
Lasiurus frantzii
western red bat
— SSC Occurs in cismontane woodland, lower montane
coniferous forest, riparian forest, riparian woodland.

Prefers habitat edges and mosaics with trees that
are protected from above and open below with
open areas for foraging.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There is one historical record between
five and ten miles from the project site.

No
Myotis yumanensis
Yuma myotis
— — Occurs in open forests and woodlands with sources
of water over which to feed. Maternity colonies in
caves, mines, buildings or crevices.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
No
513
CITY OF ALISO VIEJO — 1 5 ARGONAUT P ROJECT

Neotoma lepida intermedia
San Diego desert woodrat

CONCCP/H
CP
SSC
CONCCP
/HCP
Occurs in rock outcrops, rocky cliffs, and slopes in
coastal sage and Riversidean alluvial fan sage
scrub with moderate to dense canopies.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There is one recent and two historical
records between five and ten miles from the
project site.

No
Nyctinomops macrotis
big free-tailed bat
— SSC Occurs in rocky habitats in arid landscapes and has been found in a variety of plant associations,
including desert shrub, woodlands, and evergreen
forests. Roosts by day in crevices on cliff faces.

These bats forage mostly for large moths, but may
eat other insects as well.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There is one historical record between
five and ten miles from the project site.

No
Onychomys torridus
ramona
southern grasshopper
mouse
— SSC Occurs in desert areas, especially scrub habitats with friable soils for digging. Prefers low to
moderate shrub cover.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There is one recent record between five
and ten miles from the project site.

No
Perognathus longimembris
pacificus
Pacific pocket mouse
FE

CONCCP/
HCP
SSC
CONCCP
/HCP
Occurs in coastal strand, coastal dunes, and
coastal sage scrub growing on marine terraces.

Prefers soils of fine alluvial sands near the ocean.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There are three historical records
between five and ten miles from the project site.

No
Sorex ornatus salicornicus
southern California
saltmarsh shrew
— SSC Occurs in coastal marshes in Los Angeles, Orange
and Ventura counties. Requires dense vegetation
and woody debris for cover.

None: The project site does not contain suitable
habitat(s) that would support occurrence of this
species. There is one historical record between
five and ten miles from the project site.

No
514
CITY OF ALISO VIEJO — 1 5 ARGONAUT P ROJECT

BIOLOGICAL RESOURCES ASSESSMENT APPENDIX B
FCS
Scientific Name
Common Name
Status
Habitat Description3 Potential to Occur and Rationale4
Included in
Impact
USFWS Analysis 1 CDFW2
Code Designations
1 Federal Status: 2026 USFWS Listing 2 State Status: 2026 CDFW Listing ESU = Evolutionary Significant Unit is a distinctive population.

FE = Listed as endangered under the Endangered Species Act.

FT = Listed as threatened under the Endangered Species Act.

FC = Candidate for listing (threatened or endangered) under the Endangered Species Act.

FD = Delisted in accordance with the Endangered Species Act.

FPD = Federally Proposed to be Delisted.

BCC = Bird of Conservation Concern
MBTA= protected by the Migratory Bird Treaty Act
— = Not federally listed
SE = Listed as endangered under the California Endangered Species Act (CESA).

ST = Listed as threatened under the CESA.

SSC= Species of Special Concern as identified by CDFW.

FP = Listed as fully protected under the Fish and Game Code.

FGC= protected by Fish and Game Code 3503-3513
CE = Candidate endangered under CESA.

WL = CDFW Watch List
— = Not State listed
Notes:
3 Habitat Description: Habitat description adapted from CNDDB or other specified source 4 Potential to Occur and Rationale: Location of recorded species occurrences determined by geospatial information from BIOS 6 or other specified source.

Sources:

California Department of Fish and Wildlife (CDFW). 2026. Biogeographic Information and Observation System (BIOS 6). Website: https://map.dfg.ca.gov/bios/. Accessed April 14, 2026.

U.S. Fish and Wildlife Service (USFWS). 2026. Information for Planning and Consultation. Website: https://ecos.fws.gov/ipac/. Accessed April 14, 2026. 515

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516
FCS
Appendix C:

Cultural Resources Supporting
Information
•• • FCS
An ADEC Innovation
517

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518
15 ARGONAUT PROJECT

INITIAL STUDY/MITIGATED NEGATIVE DECLARATION APPENDIX C FCS
Photograph 1: Overview of the project site from the northern parking lot corner. View southeast Photograph 2: Overview of the project site from the northeastern parking lot corner View southwest. 519
15 ARGONAUT PROJECT

INITIAL STUDY/MITIGATED NEGATIVE DECLARATION APPENDIX C FCS
Photograph 3: Overview of the project site from the western corner. View east.

Photograph 4: Overview of the project site from the southwestern corner. View northeast. 520
15 ARGONAUT PROJECT

INITIAL STUDY/MITIGATED NEGATIVE DECLARATION APPENDIX C FCS
Photograph 5: Overview of the project site from the southern parking lot corner. View north.

Photograph 6: Overview of the project site from the southern parking lot corner View northeast. 521
15 ARGONAUT PROJECT

INITIAL STUDY/MITIGATED NEGATIVE DECLARATION APPENDIX C FCS
Photograph 7: Overview of the project site from the southeastern boundary. View northwest.

Photograph 8: Overview of the project site from the eastern parking lot corner. View west. 522
15 ARGONAUT PROJECT

INITIAL STUDY/MITIGATED NEGATIVE DECLARATION APPENDIX C FCS
Photograph 9: Overview of the project site entrance from Argonaut/east. View west.

Photograph 10: Overview of the project site from the southeastern boundary. View southwest. 523
15 ARGONAUT PROJECT

INITIAL STUDY/MITIGATED NEGATIVE DECLARATION APPENDIX C FCS
Photograph 11: Overview of the project site from the entrance. View northwest.

Photograph 12: Overview of the project site boundary taken along Aliso Creek Road. View northwest. 524
15 ARGONAUT PROJECT

INITIAL STUDY/MITIGATED NEGATIVE DECLARATION APPENDIX C FCS
Photograph 13: Overview of the project site taken relative to Aliso Creek Road and Glenwood Drive. View east. 525

THIS PAGE INTENTIONALLY LEFT BLANK
526
STATE OF CALIFORNIA Gavin Newsom, Governor

NATIVE AMERICAN HERITAGE COMMISSION

Page 1 of 2 ends

April 27, 2026
Stefanie Griffin
FCS
Via Email to: [email protected]
Re: Tribal Consultation Under CEQA, 15 Argonaut Project, Orange County To Whom It May Concern:

Pursuant to your request, attached is a consultation list of tribes that are traditionally and culturally affiliated with the geographic area of the above-listed project. Additionally, 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 positive.

Please contact the Juaneno Band of Mission Indians Acjachemen Nation – Belardes on the attached list for more information. Be aware that tribes do not always record their sacred sites in the SLF, nor are they required to do so. As such, an SLF search is not a substitute for consultation with all tribes that are traditionally and culturally affiliated with a project’s geographic area. Please contact all of the listed tribes as they may have information about sacred sites within the project area that is not listed with the NAHC.

Additionally, the NAHC recommends that agencies include with their notification letters, information regarding any cultural resources assessment that has been completed on the Area of Potential Effect (APE), such as:

1. The results of any record search that may have been conducted at an Information Center of the California Historical Resources Information System (CHRIS), including, but not limited to:
• A listing of any and all known cultural resources that have already been recorded on or adjacent to the APE, such as known archaeological sites; • Copies of any and all cultural resource records and study reports that may have been provided by the Information Center as part of the records search response; • Whether the records search indicates a low, moderate, or high probability that unrecorded cultural resources are located in the APE; and • If a survey is recommended by the Information Center to determine whether previously unrecorded cultural resources are present.

2. The results of any archaeological inventory survey that was conducted, including:
• Any report that may contain site forms, site significance, and suggested mitigation measures.

All information regarding site locations, Native American human remains, and associated funerary objects should be in a separate confidential addendum, and not be made available for public disclosure in accordance with Government Code section 6254.10.

3. The result of the Sacred Lands File check conducted through the Native American Heritage Commission.

CHAIRPERSON
Reginald Pagaling
Chumash

VICE-CHAIRPERSON
Buffy McQuillen
Yokayo Pomo, Yuki,
Nomlaki

SECRETARY
Isaac Bojorquez
Ohlone-Costanoan

PARLIAMENTARIAN
Wayne Nelson
Luiseño

COMMISSIONER
Sara Dutschke
Miwok

COMMISSIONER
Stanley Rodriguez
Kumeyaay

COMMISSIONER
Bennae Calac
Pauma-Yuima Band of
Luiseño Indians

COMMISSIONER
Vacant

EXECUTIVE SECRETARY
Andrew Alejandre
Paskenta Band of
Nomlaki Indians

NAHC HEADQUARTERS
1550 Harbor Boulevard
Suite 100
West Sacramento,
California 95691
(916) 373-3710
[email protected]
527

Page 2 of 2 ends

4. Any ethnographic studies conducted for any area including all or part of the APE; and

5. Any geotechnical reports regarding all or part of the APE.

Lead agencies should be aware that records maintained by the NAHC and CHRIS are not exhaustive and a negative response to these searches does not preclude the existence of a tribal cultural resource. A tribe may be the only source of information regarding the existence of a tribal cultural resource, which is why consultation is vital.

This information will aid tribes in determining whether to request formal consultation. If consultation is requested, having the information beforehand will help to facilitate the process.

If you receive notification of a change of address or phone number from a tribe, please inform the NAHC. With your assistance, we can assure that our consultation list remains current.

If you have any questions or require additional information, please contact me at [email protected].

Sincerely,
Andrew Green
Cultural Resources Analyst
Attachment
528
Tribe Name Fed (F)
Non-Fed (N)
Contact Person Contact Address Phone # Fax # Email Address Cultural Affiliation Last Updated Cahuilla Band of Indians F Anthony Madrigal, Tribal Historic Preservation Officer
52701 CA Highway 371
Anza, CA, 92539
(951) 763-5549 [email protected] Cahuilla 6/28/2023 Cahuilla Band of Indians F BobbyRay Esparza, Cultural
Director
52701 CA Highway 371
Anza, CA, 92539
(951) 763-5549 [email protected] Cahuilla 6/28/2023 Cahuilla Band of Indians F Erica Schenk, Chairperson 52701 CA Highway 371 Anza, CA, 92539
(951) 590-0942 (951) 763-2808 [email protected] Cahuilla 2/1/2024 Gabrieleno Band of Mission Indians - Kizh
Nation
N Andrew Salas, Chairperson P.O. Box 393
Covina, CA, 91723
(844) 390-0787 [email protected] Gabrieleno 8/18/2023 Gabrieleno Band of Mission Indians - Kizh
Nation
N Christina Swindall Martinez,
Secretary
P.O. Box 393
Covina, CA, 91723
(844) 390-0787 [email protected] Gabrieleno 8/18/2023 Gabrieleno/Tongva San Gabriel Band of
Mission Indians
N Anthony Morales, Chairperson P.O. Box 693
San Gabriel, CA, 91778
(626) 483-3564 (626) 286-1262 [email protected] Gabrieleno 12/4/2023 Gabrielino Tongva Indians of California
Tribal Council
N Christina Conley, Cultural
Resource Administrator
P.O. Box 941078
Simi Valley, CA, 93094
(626) 407-8761 [email protected]
u
Gabrielino 3/16/2023
Gabrielino Tongva Indians of California
Tribal Council
N Robert Dorame, Chairperson P.O. Box 490
Bellflower, CA, 90707
(562) 761-6417 (562) 761-6417 [email protected] Gabrielino 3/16/2023 Gabrielino/Tongva Nation N Sandonne Goad, Chairperson 13191 Crossroads Parkway North, Suite 375
City of Industry, CA, 91746
(951) 807-0479 [email protected] Gabrielino 11/6/2025 Gabrielino-Tongva Tribe N Sam Dunlap, Cultural Resource Director
P.O. Box 3919
Seal Beach, CA, 90740
(909) 262-9351 [email protected] Gabrielino 1/28/2026 Gabrielino-Tongva Tribe N Linda Candelaria, Chairperson 73465 Royal Palm Dr. #1 Palm Desert, CA, 92260
(626) 676-1184 [email protected] Gabrielino 1/28/2026 Juaneno Band of Mission Indians N Sonia Johnston, Chairperson P.O. Box 25628 Santa Ana, CA, 92799
[email protected] Juaneno
Juaneno Band of Mission Indians
Acjachemen Nation - Belardes
N Joyce Perry, Cultural Resource
Director
4955 Paseo Segovia
Irvine, CA, 92603
(949) 293-8522 [email protected] Juaneno 3/17/2023
Juaneno Band of Mission Indians
Acjachemen Nation 84A
N Heidi Lucero, THPO/MLD 31411-A La Matanza Street
San Juan Capistrano, CA, 92675
(562) 879-2884 [email protected] Juaneno 2/4/2025
Juaneno Band of Mission Indians
Acjachemen Nation 84A
N Nathan Banda, Chairman 31411-A La Matanza Street
San Juan Capistrano, CA, 92675
(949) 426-8804 [email protected] Juaneno 2/4/2025
Juaneno Band of Mission Indians
Acjachemen Nation 84A
N Shannon Wingfield, Secretary 31411-A La Matanza Street San Juan Capistrano, CA, 92675
(949) 488-3484 Juaneno 2/4/2025
La Jolla Band of Luiseno Indians F Wesley Ruise, Tribal Chairman 22000 Highway 76 Pauma Valley, CA, 92061
(760) 742-3771 [email protected] Luiseno 5/19/2025 Morongo Band of Mission Indians F Bernadette Ann Brierty, Tribal Historic Preservation Officer
12700 Pumarra Road
Banning, CA, 92220
(951) 663-2842 [email protected] Cahuilla
Serrano
11/21/2025
Morongo Band of Mission Indians F Lena Broderick, Executive Assistant to Tribal Chairman
12700 Pumarra Road
Banning, CA, 92220
(951) 755-5110 [email protected] Cahuilla
Serrano
11/21/2025
Morongo Band of Mission Indians F Charles Martin, MBMI Chairman 12700 Pumarra Road Banning, CA, 92220
(951) 755-5110 [email protected] Cahuilla
Serrano
11/21/2025
Pala Band of Mission Indians F John Pepper, THPO PMB 50, 35008 Pala Temecula Road
Pala, CA, 92059
(760) 891-3732 [email protected] Cupeno
Luiseno
4/1/2026
Pala Band of Mission Indians F Shasta Gaughen, Executive Director
PMB 50, 35008 Pala Temecula
Road
Pala, CA, 92059
(760) 891-3515 [email protected] Cupeno
Luiseno
4/1/2026
Pala Band of Mission Indians F Chris Nejo, Legal
Analyst/Researcher
PMB 50, 35008 Pala Temecula
Road
Pala, CA, 92059
(760) 891-3564 [email protected] Cupeno
Luiseno
4/1/2026
Pauma Band of Luiseno Indians F Lucia Majel, Pauma Cultural Resource Project Manager
P.O. Box 369
Pauma Valley, CA, 92061
(760) 742-1289 [email protected] Luiseno 8/1/2025
Santa Rosa Band of Cahuilla Indians F Steven Estrada, Tribal Chairman P.O. Box 391820 Anza, CA, 92539
(951) 659-2700 (951) 659-2228 [email protected] Cahuilla 4/8/2024 Santa Rosa Band of Cahuilla Indians F Mercedes Estrada, Cultural Director
P.O. Box 391820
Anza, CA, 92539
(951) 659-2700 (951) 659-2228 [email protected] Cahuilla 5/21/2025 Santa Rosa Band of Cahuilla Indians F Vanessa Minott, Tribal Administrator
P.O. Box 391820
Anza, CA, 92539
(951) 659-2700 (951) 659-2228 [email protected] Cahuilla 4/8/2024 Soboba Band of Luiseno Indians F Joseph Ontiveros, Tribal Historic Preservation Officer
P.O. Box 487
San Jacinto, CA, 92581
(951) 663-5279 (951) 654-4198 [email protected] Cahuilla Luiseno
7/14/2023
Native American Heritage Commission
Native American Contact List
Orange County
4/27/2026
Counties
Imperial,Los Angeles,Orange,Riverside,San
Bernardino,San Diego
Imperial,Los Angeles,Orange,Riverside,San
Bernardino,San Diego
Imperial,Los Angeles,Orange,Riverside,San
Bernardino,San Diego
Los Angeles,Orange,Riverside,San
Bernardino,Santa Barbara,Ventura
Los Angeles,Orange,Riverside,San
Bernardino,Santa Barbara,Ventura
Los Angeles,Orange,Riverside,San
Bernardino,Santa Barbara,Ventura
Los Angeles,Orange,Riverside,San
Bernardino,Santa Barbara,Ventura
Los Angeles,Orange,Riverside,San
Bernardino,Santa Barbara,Ventura
Los Angeles,Orange,Riverside,San
Bernardino,Santa Barbara,Ventura
Los Angeles,Orange,Riverside,San
Bernardino,Santa Barbara,Ventura
Los Angeles,Orange,Riverside,San
Bernardino,Santa Barbara,Ventura
Orange,Riverside,San Diego
Los Angeles,Orange,Riverside,San
Bernardino,San Diego
Los Angeles,Orange,Riverside,San
Bernardino,San Diego
Los Angeles,Orange,Riverside,San
Bernardino,San Diego
Los Angeles,Orange,Riverside,San
Bernardino,San Diego
Orange,Riverside,San Diego
Imperial,Kern,Los
Angeles,Orange,Riverside,San Bernardino,San
Diego,Ventura
Imperial,Kern,Los
Angeles,Orange,Riverside,San Bernardino,San
Diego,Ventura
Imperial,Kern,Los
Angeles,Orange,Riverside,San Bernardino,San
Diego,Ventura
Orange,Riverside,San Bernardino,San Diego
Orange,Riverside,San Bernardino,San Diego
Orange,Riverside,San Bernardino,San Diego
Los Angeles,Orange,Riverside,San
Bernardino,San Diego,Ventura
Imperial,Los Angeles,Orange,Riverside,San
Bernardino,San Diego
Imperial,Los Angeles,Orange,Riverside,San
Bernardino,San Diego
Imperial,Los Angeles,Orange,Riverside,San
Bernardino,San Diego
Imperial,Los Angeles,Orange,Riverside,San
Bernardino,San Diego
04/27/2026 02:35 PM
1 of 2
529
Native American Heritage Commission
Native American Contact List
Orange County
4/27/2026
Soboba Band of Luiseno Indians F Jessica Valdez, Cultural Resource Specialist
P.O. Box 487
San Jacinto, CA, 92581
(951) 663-6261 (951) 654-4198 [email protected] Cahuilla Luiseno
Imperial,Los Angeles,Orange,Riverside,San 7/14/2023
Bernardino,San Diego
This list is current only as of the date of this document. Distribution of this list does not relieve any person of statutory responsibility as defined in Section 7050.5 of the Health and Safety Code, Section 5097.94 of the Public Resources Code and Section 5097.98 of the Public Resources Code.

This list is only applicable for consultation with Native American tribes under Public Resources Code Sections 21080.3.1 for the proposed 15 Argonaut Project, Orange County.

Record: PROJ-2026-002255
Report Type: AB52 GIS
Counties: Orange
NAHC Group: All
04/27/2026 02:35 PM
2 of 2
f f f f f f f
530

UNITED STATES
T +1 888 826 5814
T +1 714 508 4100
T 303 938 5500
F +1 714 508 4110
E [email protected]
Irvine
250 Commerce
Suite 210
Irvine, CA 92602
Bay Area
2999 Oak Road
Suite 250
Walnut Creek, CA 94597
Central Valley
7726 N.FirstStreet
#413
Fresno, CA 93720
Inland Empire
967Kendall Drive
#A-537
San Bernardino, CA 92407
Sacramento Valley
2351 Sunset Boulevard
Suite 170-301
Rocklin, CA 95765
Utah
2901 Bluegrass Boulevard
Suite 200-62
Lehi, UT 84043
Colorado
5480 Valmont Road
Suite 200
Boulder, CO 80301
Connecticut
2 Corporate Drive
Suite 450
Shelton, CT 06484
New York
10 Monument Street
Deposit, NY 13754
56 Broome Corporate Parkway
Conklin, NY 13748
May 7, 2026
Cahuilla Band of Indians
BobbyRay Esparza, Cultural Director
52701 CA Highway 371
Anza, CA, 92539
Subject: 15 Argonaut Project
Dear Mr. Esparza:

FirstCarbon Solutions (FCS) is preparing an Initial Study/Mitigated Negative Declaration for the proposed 15 Argonaut Project in the city of Aliso Viejo, California. As part of the environmental review process, we are reaching out to the tribes for any additional information that can be incorporated into our analysis.

FCS understands that Brandywine Homes (applicant) is proposing the demolition of an approximately 47,096-square-foot existing office building on an approximately 4.4-acre site to facilitate the development of 58 three-story townhome units. The proposed townhomes would range from approximately 1,320 to 1,827 square feet in size and would consist of 3- and 4-bedroom units. The project site is located in the city of Aliso Viejo, Orange County, California. The project site is associated with Assessor’s Parcel Numbers 623-093-10 and 623-093-11.

As part of the cultural resources assessment, FCS conducted a Sacred Lands File (SLF) search and a California Historical Resources Information System (CHRIS)search. The results of the SLF records search were positive. The CHRIS search found that there are seven pre-contact resources within the 0.5-mile search radius of the project site. Of these, one pre-contact resource was recorded within the project boundaries. Additionally, there are 24 studies within a 0.5-mile search radius of the projectsite, four of which addressthe project site. The Native American Heritage Commission (NAHC) suggested you might be able to provide further information. If you have any additional information regarding potential historic or cultural resources in proximity or relation to the proposed project area, we would greatly appreciate your input.

Please note that this letter is a request for information pertaining to a cultural resources assessment and is not notification of a project under Senate Bill (SB) 18, Assembly Bill (AB) 52, or Section 106 of the National Historic Preservation Act.

Designated lead agencies under the California Environmental Quality Act (CEQA) and/orNational Environmental Policy Act(NEPA) are handling project notification and consultation requirements. Please feel free to contact me via email at sgriffin@fcsintl. com. Thank you for your valuable assistance. www.firstcarbonsolutions.com
FIRSTCARB0N S0LUTI0NS
FCS INTERNATIONAL, INC.
~ AN ADEC INNOVATION
531
Sincerely,
Stefanie Griffin, M.A., RPA
Senior Archaeologist
FirstCarbon Solutions
250 Commerce, Suite 210
Irvine, CA 92602
Enclosed
Attachment A: Record Search Map
Fl RSTCARBO N so LUTI ON STM
532

FIRSTCARBON

SOLUTIONS
◄
FCS INTERNATIONAL. INC.

AttachmentA:

Records Search Map ,
533
1 5 A R G O N A U T P R O J E C T
65130001 • 04/2026 | 1_local_vicinity_topo.aprx
Exhibit 1
Source: USGS San Juan Capistrano 7.5' Quadrangle / T07S, R08W, sec 4, 5, 32, 33.

Project Site USGS San Juan Capistrano 7.5' Quadrangle / T07S, R08W, sec 4. ¥
2,000 1,000 0 2,000
Feet
F C S
Local Vicinity Map, Topographic Base

R E C O R D S S E A R C H M A P
Project Site
Half Mile Radius
534

UNITED STATES
T +1 888 826 5814
T +1 714 508 4100
T 303 938 5500
F +1 714 508 4110
E [email protected]
Irvine
250 Commerce
Suite 210
Irvine, CA 92602
Bay Area
2999 Oak Road
Suite 250
Walnut Creek, CA 94597
Central Valley
7726 N.FirstStreet
#413
Fresno, CA 93720
Inland Empire
967Kendall Drive
#A-537
San Bernardino, CA 92407
Sacramento Valley
2351 Sunset Boulevard
Suite 170-301
Rocklin, CA 95765
Utah
2901 Bluegrass Boulevard
Suite 200-62
Lehi, UT 84043
Colorado
5480 Valmont Road
Suite 200
Boulder, CO 80301
Connecticut
2 Corporate Drive
Suite 450
Shelton, CT 06484
New York
10 Monument Street
Deposit, NY 13754
56 Broome Corporate Parkway
Conklin, NY 13748
May 7, 2026
Cahuilla Band of Indians
Anthony Madrigal, Tribal Historic Preservation Officer
52701 CA Highway 371
Anza, CA, 92539
Subject: 15 Argonaut Project
Dear Mr. Madrigal:

Designated lead agencies under the California Environmental Quality Act (CEQA) and/orNational Environmental Policy Act(NEPA) are handling project notification and consultation requirements. Please feel free to contact me via email at sgriffin@fcsintl. com. Thank you for your valuable assistance. www.firstcarbonsolutions.com
FIRSTCARB0N S0LUTI0NS
FCS INTERNATIONAL, INC.
~ AN ADEC INNOVATION
535
Sincerely,
Stefanie Griffin, M.A., RPA
Senior Archaeologist
FirstCarbon Solutions
250 Commerce, Suite 210
Irvine, CA 92602
Enclosed
Attachment A: Record Search Map
Fl RSTCARBO N so LUTI ON STM
536

FIRSTCARBON

SOLUTIONS
◄
FCS INTERNATIONAL. INC.

AttachmentA:

Records Search Map ,
537
1 5 A R G O N A U T P R O J E C T
65130001 • 04/2026 | 1_local_vicinity_topo.aprx
Exhibit 1
Source: USGS San Juan Capistrano 7.5' Quadrangle / T07S, R08W, sec 4, 5, 32, 33.

Project Site USGS San Juan Capistrano 7.5' Quadrangle / T07S, R08W, sec 4. ¥
2,000 1,000 0 2,000
Feet
F C S
Local Vicinity Map, Topographic Base

R E C O R D S S E A R C H M A P
Project Site
Half Mile Radius
538

UNITED STATES
T +1 888 826 5814
T +1 714 508 4100
T 303 938 5500
F +1 714 508 4110
E [email protected]
Irvine
250 Commerce
Suite 210
Irvine, CA 92602
Bay Area
2999 Oak Road
Suite 250
Walnut Creek, CA 94597
Central Valley
7726 N.FirstStreet
#413
Fresno, CA 93720
Inland Empire
967Kendall Drive
#A-537
San Bernardino, CA 92407
Sacramento Valley
2351 Sunset Boulevard
Suite 170-301
Rocklin, CA 95765
Utah
2901 Bluegrass Boulevard
Suite 200-62
Lehi, UT 84043
Colorado
5480 Valmont Road
Suite 200
Boulder, CO 80301
Connecticut
2 Corporate Drive
Suite 450
Shelton, CT 06484
New York
10 Monument Street
Deposit, NY 13754
56 Broome Corporate Parkway
Conklin, NY 13748
May 7, 2026
Cahuilla Band of Indians
Erica Schenk, Chairperson
52701 CA Highway 371
Anza, CA, 92539
Subject: 15 Argonaut Project
Dear Chairperson Schenk:

Designated lead agencies under the California Environmental Quality Act (CEQA) and/orNational Environmental Policy Act(NEPA) are handling project notification and consultation requirements. Please feel free to contact me via email at sgriffin@fcsintl. com. Thank you for your valuable assistance. www.firstcarbonsolutions.com
FIRSTCARB0N S0LUTI0NS
FCS INTERNATIONAL, INC.
~ AN ADEC INNOVATION
539
Sincerely,
Stefanie Griffin, M.A., RPA
Senior Archaeologist
FirstCarbon Solutions
250 Commerce, Suite 210
Irvine, CA 92602
Enclosed
Attachment A: Record Search Map
Fl RSTCARBO N so LUTI ON STM
540

FIRSTCARBON

SOLUTIONS
◄
FCS INTERNATIONAL. INC.

AttachmentA:

Records Search Map ,
541
1 5 A R G O N A U T P R O J E C T
65130001 • 04/2026 | 1_local_vicinity_topo.aprx
Exhibit 1
Source: USGS San Juan Capistrano 7.5' Quadrangle / T07S, R08W, sec 4, 5, 32, 33.

Project Site USGS San Juan Capistrano 7.5' Quadrangle / T07S, R08W, sec 4. ¥
2,000 1,000 0 2,000
Feet
F C S
Local Vicinity Map, Topographic Base

R E C O R D S S E A R C H M A P
Project Site
Half Mile Radius
542
May 7, 2026
Gabrielino/Tongva Nation
Linda Candelaria, Chairperson
73465 Royal Palm Drive, #1
Palm Desert, CA 92260
Subject: 15 Argonaut Project
Dear Chairperson Candelaria:

FirstCarbon Solutions(FCS) is preparing an Initial Study/Mitigated Negative Declaration for the proposed 15 Argonaut Project in the city of Aliso Viejo, California. As part of the environmental review process, we are reaching out to the tribes for any additional information that can be incorporated into our analysis.

As part of the cultural resources assessment, FCS conducted a Sacred Lands File (SLF) search and a California Historical ResourcesInformation System (CHRIS)search. The results of the SLF records search were positive. The CHRIS search found that there are seven pre-contact resources within the 0.5-mile search radius of the project site. Of these, one pre-contactresource was recorded within the project boundaries. Additionally,there are 24 studies within a 0.5-mile search radius ofthe projectsite, four of which addressthe project site. The Native American Heritage Commission (NAHC) suggested you might be able to provide further information. If you have any additional information regarding potential historic or cultural resources in proximity or relation to the proposed project area, we would greatly appreciate your input.

UNITED STATES
T +1 888 826 5814
T +1 714 508 4100
T 303 938 5500
F +1 714 508 4110
E [email protected]
Irvine
250 Commerce
Suite 210
Irvine, CA 92602
Bay Area
2999 Oak Road
Suite 250
Walnut Creek, CA 94597
Central Valley
7726N.FirstStreet
#413
Fresno, CA 93720
Inland Empire
967KendallDrive
#A-537
San Bernardino, CA 92407
Sacramento Valley
2351 Sunset Boulevard
Suite 170-301
Rocklin, CA 95765
Utah
2901 Bluegrass Boulevard
Suite 200-62
Lehi, UT 84043
Colorado
5480 Valmont Road
Suite 200
Boulder, CO 80301
Connecticut
2 Corporate Drive
Suite 450
Shelton, CT 06484
New York
10 Monument Street
Deposit, NY 13754
56Broome Corporate Parkway
Conklin, NY 13748
www.firstcarbonsolutions.com
FIRSTCARB0N S0LUTI0NS
FCS INTERNATIONAL, INC.
~ AN ADEC INNOVATION
543
Sincerely,
Stefanie Griffin, M.A., RPA
Senior Archaeologist
FirstCarbon Solutions
250 Commerce, Suite 210
Irvine, CA 92602
Enclosed
Attachment A: Record Search Map

FIRSTCARBON SOLUTIONSTM
544

FIRSTCARBON

SOLUTIONS
◄
FCS INTERNATIONAL. INC.

AttachmentA:

Records Search Map ,
545
15 ARGONAUT PROJECT

RECORDS SEARCH MAP
Source: USGS San Juan Capistrano 7.5' Quadrangle/ T07S, R08W, sec 4, 5, 32, 33.

UNITED STATES
T +1 888 826 5814
T +1 714 508 4100
T 303 938 5500
F +1 714 508 4110
E [email protected]
Irvine
250 Commerce
Suite 210
Irvine, CA 92602
Bay Area
2999 Oak Road
Suite 250
Walnut Creek, CA 94597
Central Valley
7726N.FirstStreet
#413
Fresno, CA 93720
Inland Empire
967KendallDrive
#A-537
San Bernardino, CA 92407
Sacramento Valley
2351 Sunset Boulevard
Suite 170-301
Rocklin, CA 95765
Utah
2901 Bluegrass Boulevard
Suite 200-62
Lehi, UT 84043
Colorado
5480 Valmont Road
Suite 200
Boulder, CO 80301
Connecticut
2 Corporate Drive
Suite 450
Shelton, CT 06484
New York
10 Monument Street
Deposit, NY 13754
56Broome Corporate Parkway
Conklin, NY 13748
May 7, 2026
Gabrielino-Tongva Tribe
Sam Dunlap, Cultural Resource Director
P.O. Box 3919
Seal Beach, CA 90740
Subject: 15 Argonaut Project
Dear Mr. Dunlap:

FirstCarbon Solutions(FCS) is preparing an Initial Study/Mitigated Negative Declaration for the proposed 15 Argonaut Project in the city of Aliso Viejo, California. As part of the environmental review process, we are reaching out to the tribes for any additional information that can be incorporated into our analysis.

As part of the cultural resources assessment, FCS conducted a Sacred Lands File (SLF) search and a California Historical ResourcesInformation System (CHRIS)search. The results of the SLF records search were positive. The CHRIS search found that there are seven pre-contact resources within the 0.5-mile search radius of the project site. Of these, one pre-contactresource was recorded within the project boundaries. Additionally,there are 24 studies within a 0.5-mile search radius ofthe projectsite, four of which addressthe project site. The Native American Heritage Commission (NAHC) suggested you might be able to provide further information. If you have any additional information regarding potential historic or cultural resources in proximity or relation to the proposed project area, we would greatly appreciate your input.

Designated lead agencies under the California Environmental Quality Act (CEQA) and/or National Environmental Policy Act (NEPA) are handling project notification and consultation requirements. Please feel free to contact me via email at sgriffin@fcsintl. com. Thank you for your valuable assistance. www.firstcarbonsolutions.com
FIRSTCARB0N S0LUTI0NS
FCS INTERNATIONAL, INC.
~ AN ADEC INNOVATION
547
Sincerely,
Stefanie Griffin, M.A., RPA
Senior Archaeologist
FirstCarbon Solutions
250 Commerce, Suite 210
Irvine, CA 92602
Enclosed
Attachment A: Record Search Map

FIRSTCARBON SOLUTIONSTM
548

FIRSTCARBON

SOLUTIONS
◄
FCS INTERNATIONAL. INC.

AttachmentA:

Records Search Map ,
549
15 ARGONAUT PROJECT

RECORDS SEARCH MAP
Source: USGS San Juan Capistrano 7.5' Quadrangle/ T07S, R08W, sec 4, 5, 32, 33.

UNITED STATES
T +1 888 826 5814
T +1 714 508 4100
T 303 938 5500
F +1 714 508 4110
E [email protected]
Irvine
250 Commerce
Suite 210
Irvine, CA 92602
Bay Area
2999 Oak Road
Suite 250
Walnut Creek, CA 94597
Central Valley
7726N.FirstStreet
#413
Fresno, CA 93720
Inland Empire
967KendallDrive
#A-537
San Bernardino, CA 92407
Sacramento Valley
2351 Sunset Boulevard
Suite 170-301
Rocklin, CA 95765
Utah
2901 Bluegrass Boulevard
Suite 200-62
Lehi, UT 84043
Colorado
5480 Valmont Road
Suite 200
Boulder, CO 80301
Connecticut
2 Corporate Drive
Suite 450
Shelton, CT 06484
New York
10 Monument Street
Deposit, NY 13754
56Broome Corporate Parkway
Conklin, NY 13748
May 7, 2026
Gabrielino Tongva Indians of California Tribal Council
Christina Conley, Cultural Resource Administrator
P.O. Box 941078
San Gabriel, CA 93094
Subject: 15 Argonaut Project
Dear Ms. Conley:

FirstCarbon Solutions(FCS) is preparing an Initial Study/Mitigated Negative Declaration for the proposed 15 Argonaut Project in the city of Aliso Viejo, California. As part of the environmental review process, we are reaching out to the tribes for any additional information that can be incorporated into our analysis.

As part of the cultural resources assessment, FCS conducted a Sacred Lands File (SLF) search and a California Historical ResourcesInformation System (CHRIS)search. The results of the SLF records search were positive. The CHRIS search found that there are seven pre-contact resources within the 0.5-mile search radius of the project site. Of these, one pre-contactresource was recorded within the project boundaries. Additionally,there are 24 studies within a 0.5-mile search radius ofthe projectsite, four of which addressthe project site. The Native American Heritage Commission (NAHC) suggested you might be able to provide further information. If you have any additional information regarding potential historic or cultural resources in proximity or relation to the proposed project area, we would greatly appreciate your input.

Designated lead agencies under the California Environmental Quality Act (CEQA) and/or National Environmental Policy Act (NEPA) are handling project notification and consultation requirements. Please feel free to contact me via email at sgriffin@fcsintl. com. Thank you for your valuable assistance. www.firstcarbonsolutions.com
FIRSTCARB0N S0LUTI0NS
FCS INTERNATIONAL, INC.
~ AN ADEC INNOVATION
551
Sincerely,
Stefanie Griffin, M.A., RPA
Senior Archaeologist
FirstCarbon Solutions
250 Commerce, Suite 210
Irvine, CA 92602
Enclosed
Attachment A: Record Search Map

FIRSTCARBON SOLUTIONSTM
552

FIRSTCARBON

SOLUTIONS
◄
FCS INTERNATIONAL. INC.

AttachmentA:

Records Search Map ,
553
15 ARGONAUT PROJECT

RECORDS SEARCH MAP
Source: USGS San Juan Capistrano 7.5' Quadrangle/ T07S, R08W, sec 4, 5, 32, 33.

Project Site USGS San Juan Capistrano 7.5' Quadrangle/ T07S, R08W, sec 4. 2,000 1,000 0 2,000
Feet
Exhibit 1
Local Vicinity Map, Topographic Base
FCS 65130001 • 04/2026 I 1_Iocal_vicinity_topo.aprx
554
May 7, 2026
Gabrielino Tongva Indians of California Tribal Council
Robert Dorame, Chairperson
P.O. Box 490
Bellflower, CA 90707
Subject: 15 Argonaut Project
Dear Mr. Dorame:

FirstCarbon Solutions(FCS) is preparing an Initial Study/Mitigated Negative Declaration for the proposed 15 Argonaut Project in the city of Aliso Viejo, California. As part of the environmental review process, we are reaching out to the tribes for any additional information that can be incorporated into our analysis.

As part of the cultural resources assessment, FCS conducted a Sacred Lands File (SLF) search and a California Historical ResourcesInformation System (CHRIS)search. The results of the SLF records search were positive. The CHRIS search found that there are seven pre-contact resources within the 0.5-mile search radius of the project site. Of these, one pre-contactresource was recorded within the project boundaries. Additionally,there are 24 studies within a 0.5-mile search radius ofthe projectsite, four of which addressthe project site. The Native American Heritage Commission (NAHC) suggested you might be able to provide further information. If you have any additional information regarding potential historic or cultural resources in proximity or relation to the proposed project area, we would greatly appreciate your input.

UNITED STATES
T +1 888 826 5814
T +1 714 508 4100
T 303 938 5500
F +1 714 508 4110
E [email protected]
Irvine
250 Commerce
Suite 210
Irvine, CA 92602
Bay Area
2999 Oak Road
Suite 250
Walnut Creek, CA 94597
Central Valley
7726N.FirstStreet
#413
Fresno, CA 93720
Inland Empire
967KendallDrive
#A-537
San Bernardino, CA 92407
Sacramento Valley
2351 Sunset Boulevard
Suite 170-301
Rocklin, CA 95765
Utah
2901 Bluegrass Boulevard
Suite 200-62
Lehi, UT 84043
Colorado
5480 Valmont Road
Suite 200
Boulder, CO 80301
Connecticut
2 Corporate Drive
Suite 450
Shelton, CT 06484
New York
10 Monument Street
Deposit, NY 13754
56Broome Corporate Parkway
Conklin, NY 13748
www.firstcarbonsolutions.com
FIRSTCARB0N S0LUTI0NS
FCS INTERNATIONAL, INC.
~ AN ADEC INNOVATION
555
Sincerely,
Stefanie Griffin, M.A., RPA
Senior Archaeologist
FirstCarbon Solutions
250 Commerce, Suite 210
Irvine, CA 92602
Enclosed
Attachment A: Record Search Map

FIRSTCARBON SOLUTIONSTM
556

FIRSTCARBON

SOLUTIONS
◄
FCS INTERNATIONAL. INC.

AttachmentA:

Records Search Map ,
557
15 ARGONAUT PROJECT

RECORDS SEARCH MAP
Source: USGS San Juan Capistrano 7.5' Quadrangle/ T07S, R08W, sec 4, 5, 32, 33.

Project Site USGS San Juan Capistrano 7.5' Quadrangle/ T07S, R08W, sec 4. 2,000 1,000 0 2,000
Feet
Exhibit 1
Local Vicinity Map, Topographic Base
FCS 65130001 • 04/2026 I 1_Iocal_vicinity_topo.aprx
558
May 7, 2026
Juaneño Band of Mission Indians Acjachemen Nation-84A
Heidi Lucero, THPO/MLD
31411-A La Matanza Street
San Juan Capistrano, CA 92603
Subject: 15 Argonaut Project
Dear Ms. Lucero:

FirstCarbon Solutions(FCS) is preparing an Initial Study/Mitigated Negative Declaration for the proposed 15 Argonaut Project in the city of Aliso Viejo, California. As part of the environmental review process, we are reaching out to the tribes for any additional information that can be incorporated into our analysis.

As part of the cultural resources assessment, FCS conducted a Sacred Lands File (SLF) search and a California Historical ResourcesInformation System (CHRIS)search. The results of the SLF records search were positive. The CHRIS search found that there are seven pre-contact resources within the 0.5-mile search radius of the project site. Of these, one pre-contactresource was recorded within the project boundaries. Additionally,there are 24 studies within a 0.5-mile search radius ofthe projectsite, four of which addressthe project site. The Native American Heritage Commission (NAHC) suggested you might be able to provide further information. If you have any additional information regarding potential historic or cultural resources in proximity or relation to the proposed project area, we would greatly appreciate your input.

UNITED STATES
T +1 888 826 5814
T +1 714 508 4100
T 303 938 5500
F +1 714 508 4110
E [email protected]
Irvine
250 Commerce
Suite 210
Irvine, CA 92602
Bay Area
2999 Oak Road
Suite 250
Walnut Creek, CA 94597
Central Valley
7726N.FirstStreet
#413
Fresno, CA 93720
Inland Empire
967KendallDrive
#A-537
San Bernardino, CA 92407
Sacramento Valley
2351 Sunset Boulevard
Suite 170-301
Rocklin, CA 95765
Utah
2901 Bluegrass Boulevard
Suite 200-62
Lehi, UT 84043
Colorado
5480 Valmont Road
Suite 200
Boulder, CO 80301
Connecticut
2 Corporate Drive
Suite 450
Shelton, CT 06484
New York
10 Monument Street
Deposit, NY 13754
56Broome Corporate Parkway
Conklin, NY 13748
www.firstcarbonsolutions.com
FIRSTCARB0N S0LUTI0NS
FCS INTERNATIONAL, INC.
~ AN ADEC INNOVATION
559
Sincerely,
Stefanie Griffin, M.A., RPA
Senior Archaeologist
FirstCarbon Solutions
250 Commerce, Suite 210
Irvine, CA 92602
Enclosed
Attachment A: Record Search Map

FIRSTCARBON SOLUTIONSTM
560

FIRSTCARBON

SOLUTIONS
◄
FCS INTERNATIONAL. INC.

AttachmentA:

Records Search Map ,
561
15 ARGONAUT PROJECT

RECORDS SEARCH MAP
Source: USGS San Juan Capistrano 7.5' Quadrangle/ T07S, R08W, sec 4, 5, 32, 33.

Project Site USGS San Juan Capistrano 7.5' Quadrangle/ T07S, R08W, sec 4. 2,000 1,000 0 2,000
Feet
Exhibit 1
Local Vicinity Map, Topographic Base
FCS 65130001 • 04/2026 I 1_Iocal_vicinity_topo.aprx
562
May 7, 2026
Juaneño Band of Mission Indians Acjachemen Nation-84A
Nathan Banda, Chairman
31411-A La Matanza Street
San Juan Capistrano, CA 92603
Subject: 15 Argonaut Project
Dear Chairman Banda:

FirstCarbon Solutions(FCS) is preparing an Initial Study/Mitigated Negative Declaration for the proposed 15 Argonaut Project in the city of Aliso Viejo, California. As part of the environmental review process, we are reaching out to the tribes for any additional information that can be incorporated into our analysis.

As part of the cultural resources assessment, FCS conducted a Sacred Lands File (SLF) search and a California Historical ResourcesInformation System (CHRIS)search. The results of the SLF records search were positive. The CHRIS search found that there are seven pre-contact resources within the 0.5-mile search radius of the project site. Of these, one pre-contactresource was recorded within the project boundaries. Additionally,there are 24 studies within a 0.5-mile search radius ofthe projectsite, four of which addressthe project site. The Native American Heritage Commission (NAHC) suggested you might be able to provide further information. If you have any additional information regarding potential historic or cultural resources in proximity or relation to the proposed project area, we would greatly appreciate your input.

UNITED STATES
T +1 888 826 5814
T +1 714 508 4100
T 303 938 5500
F +1 714 508 4110
E [email protected]
Irvine
250 Commerce
Suite 210
Irvine, CA 92602
Bay Area
2999 Oak Road
Suite 250
Walnut Creek, CA 94597
Central Valley
7726N.FirstStreet
#413
Fresno, CA 93720
Inland Empire
967KendallDrive
#A-537
San Bernardino, CA 92407
Sacramento Valley
2351 Sunset Boulevard
Suite 170-301
Rocklin, CA 95765
Utah
2901 Bluegrass Boulevard
Suite 200-62
Lehi, UT 84043
Colorado
5480 Valmont Road
Suite 200
Boulder, CO 80301
Connecticut
2 Corporate Drive
Suite 450
Shelton, CT 06484
New York
10 Monument Street
Deposit, NY 13754
56Broome Corporate Parkway
Conklin, NY 13748
www.firstcarbonsolutions.com
FIRSTCARB0N S0LUTI0NS
FCS INTERNATIONAL, INC.
~ AN ADEC INNOVATION
563
Sincerely,
Stefanie Griffin, M.A., RPA
Senior Archaeologist
FirstCarbon Solutions
250 Commerce, Suite 210
Irvine, CA 92602
Enclosed
Attachment A: Record Search Map

FIRSTCARBON SOLUTIONSTM
564

FIRSTCARBON

SOLUTIONS
◄
FCS INTERNATIONAL. INC.

AttachmentA:

Records Search Map ,
565
15 ARGONAUT PROJECT

RECORDS SEARCH MAP
Source: USGS San Juan Capistrano 7.5' Quadrangle/ T07S, R08W, sec 4, 5, 32, 33.

Project Site USGS San Juan Capistrano 7.5' Quadrangle/ T07S, R08W, sec 4. 2,000 1,000 0 2,000
Feet
Exhibit 1
Local Vicinity Map, Topographic Base
FCS 65130001 • 04/2026 I 1_Iocal_vicinity_topo.aprx
566
May 7, 2026
Juaneño Band of Mission Indians Acjachemen Nation-84A
Shannon Wingfield, Secretary
31411-A La Matanza Street
San Juan Capistrano, CA 92603
Subject: 15 Argonaut Project
Dear Ms. Wingfield:

FirstCarbon Solutions(FCS) is preparing an Initial Study/Mitigated Negative Declaration for the proposed 15 Argonaut Project in the city of Aliso Viejo, California. As part of the environmental review process, we are reaching out to the tribes for any additional information that can be incorporated into our analysis.

As part of the cultural resources assessment, FCS conducted a Sacred Lands File (SLF) search and a California Historical ResourcesInformation System (CHRIS)search. The results of the SLF records search were positive. The CHRIS search found that there are seven pre-contact resources within the 0.5-mile search radius of the project site. Of these, one pre-contactresource was recorded within the project boundaries. Additionally,there are 24 studies within a 0.5-mile search radius ofthe projectsite, four of which addressthe project site. The Native American Heritage Commission (NAHC) suggested you might be able to provide further information. If you have any additional information regarding potential historic or cultural resources in proximity or relation to the proposed project area, we would greatly appreciate your input.

UNITED STATES
T +1 888 826 5814
T +1 714 508 4100
T 303 938 5500
F +1 714 508 4110
E [email protected]
Irvine
250 Commerce
Suite 210
Irvine, CA 92602
Bay Area
2999 Oak Road
Suite 250
Walnut Creek, CA 94597
Central Valley
7726N.FirstStreet
#413
Fresno, CA 93720
Inland Empire
967KendallDrive
#A-537
San Bernardino, CA 92407
Sacramento Valley
2351 Sunset Boulevard
Suite 170-301
Rocklin, CA 95765
Utah
2901 Bluegrass Boulevard
Suite 200-62
Lehi, UT 84043
Colorado
5480 Valmont Road
Suite 200
Boulder, CO 80301
Connecticut
2 Corporate Drive
Suite 450
Shelton, CT 06484
New York
10 Monument Street
Deposit, NY 13754
56Broome Corporate Parkway
Conklin, NY 13748
www.firstcarbonsolutions.com
FIRSTCARB0N S0LUTI0NS
FCS INTERNATIONAL, INC.
~ AN ADEC INNOVATION
567
Sincerely,
Stefanie Griffin, M.A., RPA
Senior Archaeologist
FirstCarbon Solutions
250 Commerce, Suite 210
Irvine, CA 92602
Enclosed
Attachment A: Record Search Map

FIRSTCARBON SOLUTIONSTM
568

FIRSTCARBON

SOLUTIONS
◄
FCS INTERNATIONAL. INC.

AttachmentA:

Records Search Map ,
569
15 ARGONAUT PROJECT

RECORDS SEARCH MAP
Source: USGS San Juan Capistrano 7.5' Quadrangle/ T07S, R08W, sec 4, 5, 32, 33.

Project Site USGS San Juan Capistrano 7.5' Quadrangle/ T07S, R08W, sec 4. 2,000 1,000 0 2,000
Feet
Exhibit 1
Local Vicinity Map, Topographic Base
FCS 65130001 • 04/2026 I 1_Iocal_vicinity_topo.aprx
570
May 7, 2026
Juaneno Band of Mission Indians
Sonia Johnston, Chairperson
P.O. Box 25628
Santa Ana, CA 92799
Subject: 15 Argonaut Project
Dear Chairperson Johnston:

FirstCarbon Solutions(FCS) is preparing an Initial Study/Mitigated Negative Declaration for the proposed 15 Argonaut Project in the city of Aliso Viejo, California. As part of the environmental review process, we are reaching out to the tribes for any additional information that can be incorporated into our analysis.

As part of the cultural resources assessment, FCS conducted a Sacred Lands File (SLF) search and a California Historical ResourcesInformation System (CHRIS)search. The results of the SLF records search were positive. The CHRIS search found that there are seven pre-contact resources within the 0.5-mile search radius of the project site. Of these, one pre-contactresource was recorded within the project boundaries. Additionally,there are 24 studies within a 0.5-mile search radius ofthe projectsite, four of which addressthe project site. The Native American Heritage Commission (NAHC) suggested you might be able to provide further information. If you have any additional information regarding potential historic or cultural resources in proximity or relation to the proposed project area, we would greatly appreciate your input.

UNITED STATES
T +1 888 826 5814
T +1 714 508 4100
T 303 938 5500
F +1 714 508 4110
E [email protected]
Irvine
250 Commerce
Suite 210
Irvine, CA 92602
Bay Area
2999 Oak Road
Suite 250
Walnut Creek, CA 94597
Central Valley
7726N.FirstStreet
#413
Fresno, CA 93720
Inland Empire
967KendallDrive
#A-537
San Bernardino, CA 92407
Sacramento Valley
2351 Sunset Boulevard
Suite 170-301
Rocklin, CA 95765
Utah
2901 Bluegrass Boulevard
Suite 200-62
Lehi, UT 84043
Colorado
5480 Valmont Road
Suite 200
Boulder, CO 80301
Connecticut
2 Corporate Drive
Suite 450
Shelton, CT 06484
New York
10 Monument Street
Deposit, NY 13754
56Broome Corporate Parkway
Conklin, NY 13748
www.firstcarbonsolutions.com
FIRSTCARB0N S0LUTI0NS
FCS INTERNATIONAL, INC.
~ AN ADEC INNOVATION
571
Sincerely,
Stefanie Griffin, M.A., RPA
Senior Archaeologist
FirstCarbon Solutions
250 Commerce, Suite 210
Irvine, CA 92602
Enclosed
Attachment A: Record Search Map

FIRSTCARBON SOLUTIONSTM
572

FIRSTCARBON

SOLUTIONS
◄
FCS INTERNATIONAL. INC.

AttachmentA:

Records Search Map ,
573
15 ARGONAUT PROJECT

RECORDS SEARCH MAP
Source: USGS San Juan Capistrano 7.5' Quadrangle/ T07S, R08W, sec 4, 5, 32, 33.

UNITED STATES
T +1 888 826 5814
T +1 714 508 4100
T 303 938 5500
F +1 714 508 4110
E [email protected]
Irvine
250 Commerce
Suite 210
Irvine, CA 92602
Bay Area
2999 Oak Road
Suite 250
Walnut Creek, CA 94597
Central Valley
7726N.FirstStreet
#413
Fresno, CA 93720
Inland Empire
967KendallDrive
#A-537
San Bernardino, CA 92407
Sacramento Valley
2351 Sunset Boulevard
Suite 170-301
Rocklin, CA 95765
Utah
2901 Bluegrass Boulevard
Suite 200-62
Lehi, UT 84043
Colorado
5480 Valmont Road
Suite 200
Boulder, CO 80301
Connecticut
2 Corporate Drive
Suite 450
Shelton, CT 06484
New York
10 Monument Street
Deposit, NY 13754
56Broome Corporate Parkway
Conklin, NY 13748
May 7, 2026
Juaneño Band of Mission Indians Acjachemen Nation - Belardes Joyce Perry, Cultural Resource Director
4955 Paseo Segovia
Irvine, CA 92603
Subject: 15 Argonaut Project
Dear Ms. Perry:

FirstCarbon Solutions(FCS) is preparing an Initial Study/Mitigated Negative Declaration for the proposed 15 Argonaut Project in the city of Aliso Viejo, California. As part of the environmental review process, we are reaching out to the tribes for any additional information that can be incorporated into our analysis.

As part of the cultural resources assessment, FCS conducted a Sacred Lands File (SLF) search and a California Historical ResourcesInformation System (CHRIS)search. The results of the SLF records search were positive. The CHRIS search found that there are seven pre-contact resources within the 0.5-mile search radius of the project site. Of these, one pre-contactresource was recorded within the project boundaries. Additionally,there are 24 studies within a 0.5-mile search radius ofthe projectsite, four of which addressthe project site. The Native American Heritage Commission (NAHC) suggested you might be able to provide further information. If you have any additional information regarding potential historic or cultural resources in proximity or relation to the proposed project area, we would greatly appreciate your input.

Designated lead agencies under the California Environmental Quality Act (CEQA) and/or National Environmental Policy Act (NEPA) are handling project notification and consultation requirements. Please feel free to contact me via email at sgriffin@fcsintl. com. Thank you for your valuable assistance. www.firstcarbonsolutions.com
FIRSTCARB0N S0LUTI0NS
FCS INTERNATIONAL, INC.
~ AN ADEC INNOVATION
575
Sincerely,
Stefanie Griffin, M.A., RPA
Senior Archaeologist
FirstCarbon Solutions
250 Commerce, Suite 210
Irvine, CA 92602
Enclosed
Attachment A: Record Search Map

FIRSTCARBON SOLUTIONSTM
576

FIRSTCARBON

SOLUTIONS
◄
FCS INTERNATIONAL. INC.

AttachmentA:

Records Search Map ,
577
15 ARGONAUT PROJECT

RECORDS SEARCH MAP
Source: USGS San Juan Capistrano 7.5' Quadrangle/ T07S, R08W, sec 4, 5, 32, 33.

UNITED STATES
T +1 888 826 5814
T +1 714 508 4100
T 303 938 5500
F +1 714 508 4110
E [email protected]
Irvine
250 Commerce
Suite 210
Irvine, CA 92602
Bay Area
2999 Oak Road
Suite 250
Walnut Creek, CA 94597
Central Valley
7726 N.FirstStreet
#413
Fresno, CA 93720
Inland Empire
967Kendall Drive
#A-537
San Bernardino, CA 92407
Sacramento Valley
2351 Sunset Boulevard
Suite 170-301
Rocklin, CA 95765
Utah
2901 Bluegrass Boulevard
Suite 200-62
Lehi, UT 84043
Colorado
5480 Valmont Road
Suite 200
Boulder, CO 80301
Connecticut
2 Corporate Drive
Suite 450
Shelton, CT 06484
New York
10 Monument Street
Deposit, NY 13754
56 Broome Corporate Parkway
Conklin, NY 13748
May 7, 2026
Gabrieleno Band of Mission Indians - Kizh Nation
Andrew Salas, Chairperson
P.O. Box 393
Covina, CA, 91723
Subject: 15 Argonaut Project
Dear Chairperson Salas:

Designated lead agencies under the California Environmental Quality Act (CEQA) and/orNational Environmental Policy Act(NEPA) are handling project notification and consultation requirements. Please feel free to contact me via email at sgriffin@fcsintl. com. Thank you for your valuable assistance. www.firstcarbonsolutions.com
FIRSTCARB0N S0LUTI0NS
FCS INTERNATIONAL, INC.
~ AN ADEC INNOVATION
579
Sincerely,
Stefanie Griffin, M.A., RPA
Senior Archaeologist
FirstCarbon Solutions
250 Commerce, Suite 210
Irvine, CA 92602
Enclosed
Attachment A: Record Search Map
Fl RSTCARBO N so LUTI ON STM
580

FIRSTCARBON

SOLUTIONS
◄
FCS INTERNATIONAL. INC.

AttachmentA:

Records Search Map ,
581
1 5 A R G O N A U T P R O J E C T
65130001 • 04/2026 | 1_local_vicinity_topo.aprx
Exhibit 1
Source: USGS San Juan Capistrano 7.5' Quadrangle / T07S, R08W, sec 4, 5, 32, 33.

Project Site USGS San Juan Capistrano 7.5' Quadrangle / T07S, R08W, sec 4. ¥
2,000 1,000 0 2,000
Feet
F C S
Local Vicinity Map, Topographic Base

R E C O R D S S E A R C H M A P
Project Site
Half Mile Radius
582
May 7, 2026
La Jolla Band of Luiseño Indians
Wesley Ruise, Tribal Chairman
22000 Highway 76
Pauma Valley, CA 92061
Subject: 15 Argonaut Project
Dear Chairman Ruise:

FirstCarbon Solutions(FCS) is preparing an Initial Study/Mitigated Negative Declaration for the proposed 15 Argonaut Project in the city of Aliso Viejo, California. As part of the environmental review process, we are reaching out to the tribes for any additional information that can be incorporated into our analysis.

As part of the cultural resources assessment, FCS conducted a Sacred Lands File (SLF) search and a California Historical ResourcesInformation System (CHRIS)search. The results of the SLF records search were positive. The CHRIS search found that there are seven pre-contact resources within the 0.5-mile search radius of the project site. Of these, one pre-contactresource was recorded within the project boundaries. Additionally,there are 24 studies within a 0.5-mile search radius ofthe projectsite, four of which addressthe project site. The Native American Heritage Commission (NAHC) suggested you might be able to provide further information. If you have any additional information regarding potential historic or cultural resources in proximity or relation to the proposed project area, we would greatly appreciate your input.

UNITED STATES
T +1 888 826 5814
T +1 714 508 4100
T 303 938 5500
F +1 714 508 4110
E [email protected]
Irvine
250 Commerce
Suite 210
Irvine, CA 92602
Bay Area
2999 Oak Road
Suite 250
Walnut Creek, CA 94597
Central Valley
7726N.FirstStreet
#413
Fresno, CA 93720
Inland Empire
967KendallDrive
#A-537
San Bernardino, CA 92407
Sacramento Valley
2351 Sunset Boulevard
Suite 170-301
Rocklin, CA 95765
Utah
2901 Bluegrass Boulevard
Suite 200-62
Lehi, UT 84043
Colorado
5480 Valmont Road
Suite 200
Boulder, CO 80301
Connecticut
2 Corporate Drive
Suite 450
Shelton, CT 06484
New York
10 Monument Street
Deposit, NY 13754
56Broome Corporate Parkway
Conklin, NY 13748
www.firstcarbonsolutions.com
FIRSTCARB0N S0LUTI0NS
FCS INTERNATIONAL, INC.
~ AN ADEC INNOVATION
583
Sincerely,
Stefanie Griffin, M.A., RPA
Senior Archaeologist
FirstCarbon Solutions
250 Commerce, Suite 210
Irvine, CA 92602
Enclosed
Attachment A: Record Search Map

FIRSTCARBON SOLUTIONSTM
584

FIRSTCARBON

SOLUTIONS
◄
FCS INTERNATIONAL. INC.

AttachmentA:

Records Search Map ,
585
15 ARGONAUT PROJECT

RECORDS SEARCH MAP
Source: USGS San Juan Capistrano 7.5' Quadrangle/ T07S, R08W, sec 4, 5, 32, 33.

Project Site USGS San Juan Capistrano 7.5' Quadrangle/ T07S, R08W, sec 4. 2,000 1,000 0 2,000
Feet
Exhibit 1
Local Vicinity Map, Topographic Base
FCS 65130001 • 04/2026 I 1_Iocal_vicinity_topo.aprx
586
May 7, 2026
Morongo Band of Mission Indians
Bernadette Ann Brierty, Tribal Historic Preservation Officer 12700 Pumarra Road
Banning, CA 92220
Subject: 15 Argonaut Project
Dear Ms. Bernadette:

FirstCarbon Solutions(FCS) is preparing an Initial Study/Mitigated Negative Declaration for the proposed 15 Argonaut Project in the city of Aliso Viejo, California. As part of the environmental review process, we are reaching out to the tribes for any additional information that can be incorporated into our analysis.

As part of the cultural resources assessment, FCS conducted a Sacred Lands File (SLF) search and a California Historical ResourcesInformation System (CHRIS)search. The results of the SLF records search were positive. The CHRIS search found that there are seven pre-contact resources within the 0.5-mile search radius of the project site. Of these, one pre-contactresource was recorded within the project boundaries. Additionally,there are 24 studies within a 0.5-mile search radius ofthe projectsite, four of which addressthe project site. The Native American Heritage Commission (NAHC) suggested you might be able to provide further information. If you have any additional information regarding potential historic or cultural resources in proximity or relation to the proposed project area, we would greatly appreciate your input.

UNITED STATES
T +1 888 826 5814
T +1 714 508 4100
T 303 938 5500
F +1 714 508 4110
E [email protected]
Irvine
250 Commerce
Suite 210
Irvine, CA 92602
Bay Area
2999 Oak Road
Suite 250
Walnut Creek, CA 94597
Central Valley
7726N.FirstStreet
#413
Fresno, CA 93720
Inland Empire
967KendallDrive
#A-537
San Bernardino, CA 92407
Sacramento Valley
2351 Sunset Boulevard
Suite 170-301
Rocklin, CA 95765
Utah
2901 Bluegrass Boulevard
Suite 200-62
Lehi, UT 84043
Colorado
5480 Valmont Road
Suite 200
Boulder, CO 80301
Connecticut
2 Corporate Drive
Suite 450
Shelton, CT 06484
New York
10 Monument Street
Deposit, NY 13754
56Broome Corporate Parkway
Conklin, NY 13748
www.firstcarbonsolutions.com
FIRSTCARB0N S0LUTI0NS
FCS INTERNATIONAL, INC.
~ AN ADEC INNOVATION
587
Sincerely,
Stefanie Griffin, M.A., RPA
Senior Archaeologist
FirstCarbon Solutions
250 Commerce, Suite 210
Irvine, CA 92602
Enclosed
Attachment A: Record Search Map

FIRSTCARBON SOLUTIONSTM
588

FIRSTCARBON

SOLUTIONS
◄
FCS INTERNATIONAL. INC.

AttachmentA:

Records Search Map ,
589
15 ARGONAUT PROJECT

RECORDS SEARCH MAP
Source: USGS San Juan Capistrano 7.5' Quadrangle/ T07S, R08W, sec 4, 5, 32, 33.

Project Site USGS San Juan Capistrano 7.5' Quadrangle/ T07S, R08W, sec 4. 2,000 1,000 0 2,000
Feet
Exhibit 1
Local Vicinity Map, Topographic Base
FCS 65130001 • 04/2026 I 1_Iocal_vicinity_topo.aprx
590
May 7, 2026
Morongo Band of Mission Indians
Lena Broderick, Executive Assistant to Tribal Chairman
12700 Pumarra Road
Banning, CA 92220
Subject: 15 Argonaut Project
Dear Ms. Broderick:

FirstCarbon Solutions(FCS) is preparing an Initial Study/Mitigated Negative Declaration for the proposed 15 Argonaut Project in the city of Aliso Viejo, California. As part of the environmental review process, we are reaching out to the tribes for any additional information that can be incorporated into our analysis.

As part of the cultural resources assessment, FCS conducted a Sacred Lands File (SLF) search and a California Historical ResourcesInformation System (CHRIS)search. The results of the SLF records search were positive. The CHRIS search found that there are seven pre-contact resources within the 0.5-mile search radius of the project site. Of these, one pre-contactresource was recorded within the project boundaries. Additionally,there are 24 studies within a 0.5-mile search radius ofthe projectsite, four of which addressthe project site. The Native American Heritage Commission (NAHC) suggested you might be able to provide further information. If you have any additional information regarding potential historic or cultural resources in proximity or relation to the proposed project area, we would greatly appreciate your input.

UNITED STATES
T +1 888 826 5814
T +1 714 508 4100
T 303 938 5500
F +1 714 508 4110
E [email protected]
Irvine
250 Commerce
Suite 210
Irvine, CA 92602
Bay Area
2999 Oak Road
Suite 250
Walnut Creek, CA 94597
Central Valley
7726N.FirstStreet
#413
Fresno, CA 93720
Inland Empire
967KendallDrive
#A-537
San Bernardino, CA 92407
Sacramento Valley
2351 Sunset Boulevard
Suite 170-301
Rocklin, CA 95765
Utah
2901 Bluegrass Boulevard
Suite 200-62
Lehi, UT 84043
Colorado
5480 Valmont Road
Suite 200
Boulder, CO 80301
Connecticut
2 Corporate Drive
Suite 450
Shelton, CT 06484
New York
10 Monument Street
Deposit, NY 13754
56Broome Corporate Parkway
Conklin, NY 13748
www.firstcarbonsolutions.com
FIRSTCARB0N S0LUTI0NS
FCS INTERNATIONAL, INC.
~ AN ADEC INNOVATION
591
Sincerely,
Stefanie Griffin, M.A., RPA
Senior Archaeologist
FirstCarbon Solutions
250 Commerce, Suite 210
Irvine, CA 92602
Enclosed
Attachment A: Record Search Map

FIRSTCARBON SOLUTIONSTM
592

FIRSTCARBON

SOLUTIONS
◄
FCS INTERNATIONAL. INC.

AttachmentA:

Records Search Map ,
593
15 ARGONAUT PROJECT

RECORDS SEARCH MAP
Source: USGS San Juan Capistrano 7.5' Quadrangle/ T07S, R08W, sec 4, 5, 32, 33.

Project Site USGS San Juan Capistrano 7.5' Quadrangle/ T07S, R08W, sec 4. 2,000 1,000 0 2,000
Feet
Exhibit 1
Local Vicinity Map, Topographic Base
FCS 65130001 • 04/2026 I 1_Iocal_vicinity_topo.aprx
594
May 7, 2026
Morongo Band of Mission Indians
Charles Martin, MBMI Chairman
12700 Pumarra Road
Banning, CA 92220
Subject: 15 Argonaut Project
Dear Chairman Martin:

FirstCarbon Solutions(FCS) is preparing an Initial Study/Mitigated Negative Declaration for the proposed 15 Argonaut Project in the city of Aliso Viejo, California. As part of the environmental review process, we are reaching out to the tribes for any additional information that can be incorporated into our analysis.

As part of the cultural resources assessment, FCS conducted a Sacred Lands File (SLF) search and a California Historical ResourcesInformation System (CHRIS)search. The results of the SLF records search were positive. The CHRIS search found that there are seven pre-contact resources within the 0.5-mile search radius of the project site. Of these, one pre-contactresource was recorded within the project boundaries. Additionally,there are 24 studies within a 0.5-mile search radius ofthe projectsite, four of which addressthe project site. The Native American Heritage Commission (NAHC) suggested you might be able to provide further information. If you have any additional information regarding potential historic or cultural resources in proximity or relation to the proposed project area, we would greatly appreciate your input.

UNITED STATES
T +1 888 826 5814
T +1 714 508 4100
T 303 938 5500
F +1 714 508 4110
E [email protected]
Irvine
250 Commerce
Suite 210
Irvine, CA 92602
Bay Area
2999 Oak Road
Suite 250
Walnut Creek, CA 94597
Central Valley
7726N.FirstStreet
#413
Fresno, CA 93720
Inland Empire
967KendallDrive
#A-537
San Bernardino, CA 92407
Sacramento Valley
2351 Sunset Boulevard
Suite 170-301
Rocklin, CA 95765
Utah
2901 Bluegrass Boulevard
Suite 200-62
Lehi, UT 84043
Colorado
5480 Valmont Road
Suite 200
Boulder, CO 80301
Connecticut
2 Corporate Drive
Suite 450
Shelton, CT 06484
New York
10 Monument Street
Deposit, NY 13754
56Broome Corporate Parkway
Conklin, NY 13748
www.firstcarbonsolutions.com
FIRSTCARB0N S0LUTI0NS
FCS INTERNATIONAL, INC.
~ AN ADEC INNOVATION
595
Sincerely,
Stefanie Griffin, M.A., RPA
Senior Archaeologist
FirstCarbon Solutions
250 Commerce, Suite 210
Irvine, CA 92602
Enclosed
Attachment A: Record Search Map

FIRSTCARBON SOLUTIONSTM
596

FIRSTCARBON

SOLUTIONS
◄
FCS INTERNATIONAL. INC.

AttachmentA:

Records Search Map ,
597
15 ARGONAUT PROJECT

RECORDS SEARCH MAP
Source: USGS San Juan Capistrano 7.5' Quadrangle/ T07S, R08W, sec 4, 5, 32, 33.

Project Site USGS San Juan Capistrano 7.5' Quadrangle/ T07S, R08W, sec 4. 2,000 1,000 0 2,000
Feet
Exhibit 1
Local Vicinity Map, Topographic Base
FCS 65130001 • 04/2026 I 1_Iocal_vicinity_topo.aprx
598
May 7, 2026
Pala Band of Mission Indians
Shasta Gaughen, Executive Director
PMB 50, 35008 Pala Temecula Road
Pala, CA 92059
Subject: 15 Argonaut Project
Dear Ms. Gaughen:

FirstCarbon Solutions(FCS) is preparing an Initial Study/Mitigated Negative Declaration for the proposed 15 Argonaut Project in the city of Aliso Viejo, California. As part of the environmental review process, we are reaching out to the tribes for any additional information that can be incorporated into our analysis.

As part of the cultural resources assessment, FCS conducted a Sacred Lands File (SLF) search and a California Historical ResourcesInformation System (CHRIS)search. The results of the SLF records search were positive. The CHRIS search found that there are seven pre-contact resources within the 0.5-mile search radius of the project site. Of these, one pre-contactresource was recorded within the project boundaries. Additionally,there are 24 studies within a 0.5-mile search radius ofthe projectsite, four of which addressthe project site. The Native American Heritage Commission (NAHC) suggested you might be able to provide further information. If you have any additional information regarding potential historic or cultural resources in proximity or relation to the proposed project area, we would greatly appreciate your input.

UNITED STATES
T +1 888 826 5814
T +1 714 508 4100
T 303 938 5500
F +1 714 508 4110
E [email protected]
Irvine
250 Commerce
Suite 210
Irvine, CA 92602
Bay Area
2999 Oak Road
Suite 250
Walnut Creek, CA 94597
Central Valley
7726N.FirstStreet
#413
Fresno, CA 93720
Inland Empire
967KendallDrive
#A-537
San Bernardino, CA 92407
Sacramento Valley
2351 Sunset Boulevard
Suite 170-301
Rocklin, CA 95765
Utah
2901 Bluegrass Boulevard
Suite 200-62
Lehi, UT 84043
Colorado
5480 Valmont Road
Suite 200
Boulder, CO 80301
Connecticut
2 Corporate Drive
Suite 450
Shelton, CT 06484
New York
10 Monument Street
Deposit, NY 13754
56Broome Corporate Parkway
Conklin, NY 13748
www.firstcarbonsolutions.com
FIRSTCARB0N S0LUTI0NS
FCS INTERNATIONAL, INC.
~ AN ADEC INNOVATION
599
Sincerely,
Stefanie Griffin, M.A., RPA
Senior Archaeologist
FirstCarbon Solutions
250 Commerce, Suite 210
Irvine, CA 92602
Enclosed
Attachment A: Record Search Map

FIRSTCARBON SOLUTIONSTM
600

FIRSTCARBON

SOLUTIONS
◄
FCS INTERNATIONAL. INC.

AttachmentA:

Records Search Map ,
601
15 ARGONAUT PROJECT

RECORDS SEARCH MAP
Source: USGS San Juan Capistrano 7.5' Quadrangle/ T07S, R08W, sec 4, 5, 32, 33.

Project Site USGS San Juan Capistrano 7.5' Quadrangle/ T07S, R08W, sec 4. 2,000 1,000 0 2,000
Feet
Exhibit 1
Local Vicinity Map, Topographic Base
FCS 65130001 • 04/2026 I 1_Iocal_vicinity_topo.aprx
602
May 7, 2026
Pala Band of Mission Indians
Chris Nejo, Legal Analyst/Researcher
PMB 50, 35008 Pala Temecula Road
Pala, CA 92059
Subject: 15 Argonaut Project
Dear Mr. Nejo:

FirstCarbon Solutions(FCS) is preparing an Initial Study/Mitigated Negative Declaration for the proposed 15 Argonaut Project in the city of Aliso Viejo, California. As part of the environmental review process, we are reaching out to the tribes for any additional information that can be incorporated into our analysis.

As part of the cultural resources assessment, FCS conducted a Sacred Lands File (SLF) search and a California Historical ResourcesInformation System (CHRIS)search. The results of the SLF records search were positive. The CHRIS search found that there are seven pre-contact resources within the 0.5-mile search radius of the project site. Of these, one pre-contactresource was recorded within the project boundaries. Additionally,there are 24 studies within a 0.5-mile search radius ofthe projectsite, four of which addressthe project site. The Native American Heritage Commission (NAHC) suggested you might be able to provide further information. If you have any additional information regarding potential historic or cultural resources in proximity or relation to the proposed project area, we would greatly appreciate your input.

UNITED STATES
T +1 888 826 5814
T +1 714 508 4100
T 303 938 5500
F +1 714 508 4110
E [email protected]
Irvine
250 Commerce
Suite 210
Irvine, CA 92602
Bay Area
2999 Oak Road
Suite 250
Walnut Creek, CA 94597
Central Valley
7726N.FirstStreet
#413
Fresno, CA 93720
Inland Empire
967KendallDrive
#A-537
San Bernardino, CA 92407
Sacramento Valley
2351 Sunset Boulevard
Suite 170-301
Rocklin, CA 95765
Utah
2901 Bluegrass Boulevard
Suite 200-62
Lehi, UT 84043
Colorado
5480 Valmont Road
Suite 200
Boulder, CO 80301
Connecticut
2 Corporate Drive
Suite 450
Shelton, CT 06484
New York
10 Monument Street
Deposit, NY 13754
56Broome Corporate Parkway
Conklin, NY 13748
www.firstcarbonsolutions.com
FIRSTCARB0N S0LUTI0NS
FCS INTERNATIONAL, INC.
~ AN ADEC INNOVATION
603
Sincerely,
Stefanie Griffin, M.A., RPA
Senior Archaeologist
FirstCarbon Solutions
250 Commerce, Suite 210
Irvine, CA 92602
Enclosed
Attachment A: Record Search Map

FIRSTCARBON SOLUTIONSTM
604

FIRSTCARBON

SOLUTIONS
◄
FCS INTERNATIONAL. INC.

AttachmentA:

Records Search Map ,
605
15 ARGONAUT PROJECT

RECORDS SEARCH MAP
Source: USGS San Juan Capistrano 7.5' Quadrangle/ T07S, R08W, sec 4, 5, 32, 33.

Project Site USGS San Juan Capistrano 7.5' Quadrangle/ T07S, R08W, sec 4. 2,000 1,000 0 2,000
Feet
Exhibit 1
Local Vicinity Map, Topographic Base
FCS 65130001 • 04/2026 I 1_Iocal_vicinity_topo.aprx
606
May 7, 2026
Pala Band of Mission Indians
John Pepper, THPO
PMB 50, 35008 Pala Temecula Road
Pala, CA 92059
Subject: 15 Argonaut Project
Dear Mr. Pepper:

FirstCarbon Solutions(FCS) is preparing an Initial Study/Mitigated Negative Declaration for the proposed 15 Argonaut Project in the city of Aliso Viejo, California. As part of the environmental review process, we are reaching out to the tribes for any additional information that can be incorporated into our analysis.

As part of the cultural resources assessment, FCS conducted a Sacred Lands File (SLF) search and a California Historical ResourcesInformation System (CHRIS)search. The results of the SLF records search were positive. The CHRIS search found that there are seven pre-contact resources within the 0.5-mile search radius of the project site. Of these, one pre-contactresource was recorded within the project boundaries. Additionally,there are 24 studies within a 0.5-mile search radius ofthe projectsite, four of which addressthe project site. The Native American Heritage Commission (NAHC) suggested you might be able to provide further information. If you have any additional information regarding potential historic or cultural resources in proximity or relation to the proposed project area, we would greatly appreciate your input.

UNITED STATES
T +1 888 826 5814
T +1 714 508 4100
T 303 938 5500
F +1 714 508 4110
E [email protected]
Irvine
250 Commerce
Suite 210
Irvine, CA 92602
Bay Area
2999 Oak Road
Suite 250
Walnut Creek, CA 94597
Central Valley
7726N.FirstStreet
#413
Fresno, CA 93720
Inland Empire
967KendallDrive
#A-537
San Bernardino, CA 92407
Sacramento Valley
2351 Sunset Boulevard
Suite 170-301
Rocklin, CA 95765
Utah
2901 Bluegrass Boulevard
Suite 200-62
Lehi, UT 84043
Colorado
5480 Valmont Road
Suite 200
Boulder, CO 80301
Connecticut
2 Corporate Drive
Suite 450
Shelton, CT 06484
New York
10 Monument Street
Deposit, NY 13754
56Broome Corporate Parkway
Conklin, NY 13748
www.firstcarbonsolutions.com
FIRSTCARB0N S0LUTI0NS
FCS INTERNATIONAL, INC.
~ AN ADEC INNOVATION
607
Sincerely,
Stefanie Griffin, M.A., RPA
Senior Archaeologist
FirstCarbon Solutions
250 Commerce, Suite 210
Irvine, CA 92602
Enclosed
Attachment A: Record Search Map

FIRSTCARBON SOLUTIONSTM
608

FIRSTCARBON

SOLUTIONS
◄
FCS INTERNATIONAL. INC.

AttachmentA:

Records Search Map ,
609
15 ARGONAUT PROJECT

RECORDS SEARCH MAP
Source: USGS San Juan Capistrano 7.5' Quadrangle/ T07S, R08W, sec 4, 5, 32, 33.

Project Site USGS San Juan Capistrano 7.5' Quadrangle/ T07S, R08W, sec 4. 2,000 1,000 0 2,000
Feet
Exhibit 1
Local Vicinity Map, Topographic Base
FCS 65130001 • 04/2026 I 1_Iocal_vicinity_topo.aprx
610
May 7, 2026
Pauma Band of Luiseño Indians
Lucia Majel, Pauma Cultural Resources Project Manager
P.O. Box 369
Pauma Valley, CA 92061
Subject: 15 Argonaut Project
Dear Ms. Majel:

FirstCarbon Solutions(FCS) is preparing an Initial Study/Mitigated Negative Declaration for the proposed 15 Argonaut Project in the city of Aliso Viejo, California. As part of the environmental review process, we are reaching out to the tribes for any additional information that can be incorporated into our analysis.

As part of the cultural resources assessment, FCS conducted a Sacred Lands File (SLF) search and a California Historical ResourcesInformation System (CHRIS)search. The results of the SLF records search were positive. The CHRIS search found that there are seven pre-contact resources within the 0.5-mile search radius of the project site. Of these, one pre-contactresource was recorded within the project boundaries. Additionally,there are 24 studies within a 0.5-mile search radius ofthe projectsite, four of which addressthe project site. The Native American Heritage Commission (NAHC) suggested you might be able to provide further information. If you have any additional information regarding potential historic or cultural resources in proximity or relation to the proposed project area, we would greatly appreciate your input.

UNITED STATES
T +1 888 826 5814
T +1 714 508 4100
T 303 938 5500
F +1 714 508 4110
E [email protected]
Irvine
250 Commerce
Suite 210
Irvine, CA 92602
Bay Area
2999 Oak Road
Suite 250
Walnut Creek, CA 94597
Central Valley
7726N.FirstStreet
#413
Fresno, CA 93720
Inland Empire
967KendallDrive
#A-537
San Bernardino, CA 92407
Sacramento Valley
2351 Sunset Boulevard
Suite 170-301
Rocklin, CA 95765
Utah
2901 Bluegrass Boulevard
Suite 200-62
Lehi, UT 84043
Colorado
5480 Valmont Road
Suite 200
Boulder, CO 80301
Connecticut
2 Corporate Drive
Suite 450
Shelton, CT 06484
New York
10 Monument Street
Deposit, NY 13754
56Broome Corporate Parkway
Conklin, NY 13748
www.firstcarbonsolutions.com
FIRSTCARB0N S0LUTI0NS
FCS INTERNATIONAL, INC.
~ AN ADEC INNOVATION
611
Sincerely,
Stefanie Griffin, M.A., RPA
Senior Archaeologist
FirstCarbon Solutions
250 Commerce, Suite 210
Irvine, CA 92602
Enclosed
Attachment A: Record Search Map

FIRSTCARBON SOLUTIONSTM
612

FIRSTCARBON

SOLUTIONS
◄
FCS INTERNATIONAL. INC.

AttachmentA:

Records Search Map ,
613
15 ARGONAUT PROJECT

RECORDS SEARCH MAP
Source: USGS San Juan Capistrano 7.5' Quadrangle/ T07S, R08W, sec 4, 5, 32, 33.

UNITED STATES
T +1 888 826 5814
T +1 714 508 4100
T 303 938 5500
F +1 714 508 4110
E [email protected]
Irvine
250 Commerce
Suite 210
Irvine, CA 92602
Bay Area
2999 Oak Road
Suite 250
Walnut Creek, CA 94597
Central Valley
7726 N.FirstStreet
#413
Fresno, CA 93720
Inland Empire
967Kendall Drive
#A-537
San Bernardino, CA 92407
Sacramento Valley
2351 Sunset Boulevard
Suite 170-301
Rocklin, CA 95765
Utah
2901 Bluegrass Boulevard
Suite 200-62
Lehi, UT 84043
Colorado
5480 Valmont Road
Suite 200
Boulder, CO 80301
Connecticut
2 Corporate Drive
Suite 450
Shelton, CT 06484
New York
10 Monument Street
Deposit, NY 13754
56 Broome Corporate Parkway
Conklin, NY 13748
May 7, 2026
Gabrieleno/Tongva San Gabriel Band of Mission Indians
Anthony Morales, Chairperson
P.O. Box 693
San Gabriel, CA 91778
Subject: 15 Argonuat Project
Dear Chairperson Morales:

As part of the cultural resources assessment, FCS conducted a Sacred Lands File (SLF) search and a California Historical ResourcesInformation System (CHRIS)search. The results of the SLF records search were positive. The CHRIS search found that there are seven pre-contact resources within the 0.5-mile search radius of the project site. Of these, one pre-contact resource was recorded within the project boundaries. Additionally, there are 24 studies within a 0.5-mile search radius of the projectsite, four of which addressthe projectsite. The Native American Heritage Commission (NAHC) suggested you might be able to provide further information. If you have any additional information regarding potential historic or cultural resources in proximity or relation to the proposed project area, we would greatly appreciate your input.

Designated lead agencies under the California Environmental Quality Act (CEQA) and/orNational Environmental Policy Act(NEPA) are handling project notification and consultation requirements. Please feel free to contact me via email at sgriffin@fcsintl. com. Thank you for your valuable assistance. www.firstcarbonsolutions.com
FIRSTCARB0N S0LUTI0NS
FCS INTERNATIONAL, INC.
~ AN ADEC INNOVATION
615
Sincerely,
Stefanie Griffin, M.A., RPA
Senior Archaeologist
FirstCarbon Solutions
250 Commerce, Suite 210
Irvine, CA 92602
Enclosed
Attachment A: Record Search Map
Fl RSTCARBO N so LUTI ON STM
616

FIRSTCARBON

SOLUTIONS
◄
FCS INTERNATIONAL. INC.

AttachmentA:

Records Search Map ,
617
1 5 A R G O N A U T P R O J E C T
65130001 • 04/2026 | 1_local_vicinity_topo.aprx
Exhibit 1
Source: USGS San Juan Capistrano 7.5' Quadrangle / T07S, R08W, sec 4, 5, 32, 33.

Project Site USGS San Juan Capistrano 7.5' Quadrangle / T07S, R08W, sec 4. ¥
2,000 1,000 0 2,000
Feet
F C S
Local Vicinity Map, Topographic Base

R E C O R D S S E A R C H M A P
Project Site
Half Mile Radius
618

UNITED STATES
T +1 888 826 5814
T +1 714 508 4100
T 303 938 5500
F +1 714 508 4110
E [email protected]
Irvine
250 Commerce
Suite 210
Irvine, CA 92602
Bay Area
2999 Oak Road
Suite 250
Walnut Creek, CA 94597
Central Valley
7726N.FirstStreet
#413
Fresno, CA 93720
Inland Empire
967KendallDrive
#A-537
San Bernardino, CA 92407
Sacramento Valley
2351 Sunset Boulevard
Suite 170-301
Rocklin, CA 95765
Utah
2901 Bluegrass Boulevard
Suite 200-62
Lehi, UT 84043
Colorado
5480 Valmont Road
Suite 200
Boulder, CO 80301
Connecticut
2 Corporate Drive
Suite 450
Shelton, CT 06484
New York
10 Monument Street
Deposit, NY 13754
56Broome Corporate Parkway
Conklin, NY 13748
May 7, 2026
Santa Rosa Band of Cahuilla Indians
Steven Estrada, Tribal Chairman
P.O. Box 391820
Anza, CA 92539
Subject: 15 Argonaut Project
Dear Chairman Estrada:

FirstCarbon Solutions(FCS) is preparing an Initial Study/Mitigated Negative Declaration for the proposed 15 Argonaut Project in the city of Aliso Viejo, California. As part of the environmental review process, we are reaching out to the tribes for any additional information that can be incorporated into our analysis.

As part of the cultural resources assessment, FCS conducted a Sacred Lands File (SLF) search and a California Historical ResourcesInformation System (CHRIS)search. The results of the SLF records search were positive. The CHRIS search found that there are seven pre-contact resources within the 0.5-mile search radius of the project site. Of these, one pre-contactresource was recorded within the project boundaries. Additionally,there are 24 studies within a 0.5-mile search radius ofthe projectsite, four of which addressthe project site. The Native American Heritage Commission (NAHC) suggested you might be able to provide further information. If you have any additional information regarding potential historic or cultural resources in proximity or relation to the proposed project area, we would greatly appreciate your input.

Designated lead agencies under the California Environmental Quality Act (CEQA) and/or National Environmental Policy Act (NEPA) are handling project notification and consultation requirements. Please feel free to contact me via email at sgriffin@fcsintl. com. Thank you for your valuable assistance. www.firstcarbonsolutions.com
FIRSTCARB0N S0LUTI0NS
FCS INTERNATIONAL, INC.
~ AN ADEC INNOVATION
619
Sincerely,
Stefanie Griffin, M.A., RPA
Senior Archaeologist
FirstCarbon Solutions
250 Commerce, Suite 210
Irvine, CA 92602
Enclosed
Attachment A: Record Search Map

FIRSTCARBON SOLUTIONSTM
620

FIRSTCARBON

SOLUTIONS
◄
FCS INTERNATIONAL. INC.

AttachmentA:

Records Search Map ,
621
15 ARGONAUT PROJECT

RECORDS SEARCH MAP
Source: USGS San Juan Capistrano 7.5' Quadrangle/ T07S, R08W, sec 4, 5, 32, 33.

Project Site USGS San Juan Capistrano 7.5' Quadrangle/ T07S, R08W, sec 4. 2,000 1,000 0 2,000
Feet
Exhibit 1
Local Vicinity Map, Topographic Base
FCS 65130001 • 04/2026 I 1_Iocal_vicinity_topo.aprx
622
May 7, 2026
Santa Rosa Band of Cahuilla Indians
Mercedes Estrada, Cultural Director
P.O. Box 391820
Anza, CA 92539
Subject: 15 Argonaut Project
Dear Ms. Estrada:

FirstCarbon Solutions(FCS) is preparing an Initial Study/Mitigated Negative Declaration for the proposed 15 Argonaut Project in the city of Aliso Viejo, California. As part of the environmental review process, we are reaching out to the tribes for any additional information that can be incorporated into our analysis.

As part of the cultural resources assessment, FCS conducted a Sacred Lands File (SLF) search and a California Historical ResourcesInformation System (CHRIS)search. The results of the SLF records search were positive. The CHRIS search found that there are seven pre-contact resources within the 0.5-mile search radius of the project site. Of these, one pre-contactresource was recorded within the project boundaries. Additionally,there are 24 studies within a 0.5-mile search radius ofthe projectsite, four of which addressthe project site. The Native American Heritage Commission (NAHC) suggested you might be able to provide further information. If you have any additional information regarding potential historic or cultural resources in proximity or relation to the proposed project area, we would greatly appreciate your input.

UNITED STATES
T +1 888 826 5814
T +1 714 508 4100
T 303 938 5500
F +1 714 508 4110
E [email protected]
Irvine
250 Commerce
Suite 210
Irvine, CA 92602
Bay Area
2999 Oak Road
Suite 250
Walnut Creek, CA 94597
Central Valley
7726N.FirstStreet
#413
Fresno, CA 93720
Inland Empire
967KendallDrive
#A-537
San Bernardino, CA 92407
Sacramento Valley
2351 Sunset Boulevard
Suite 170-301
Rocklin, CA 95765
Utah
2901 Bluegrass Boulevard
Suite 200-62
Lehi, UT 84043
Colorado
5480 Valmont Road
Suite 200
Boulder, CO 80301
Connecticut
2 Corporate Drive
Suite 450
Shelton, CT 06484
New York
10 Monument Street
Deposit, NY 13754
56Broome Corporate Parkway
Conklin, NY 13748
www.firstcarbonsolutions.com
FIRSTCARB0N S0LUTI0NS
FCS INTERNATIONAL, INC.
~ AN ADEC INNOVATION
623
Sincerely,
Stefanie Griffin, M.A., RPA
Senior Archaeologist
FirstCarbon Solutions
250 Commerce, Suite 210
Irvine, CA 92602
Enclosed
Attachment A: Record Search Map

FIRSTCARBON SOLUTIONSTM
624

FIRSTCARBON

SOLUTIONS
◄
FCS INTERNATIONAL. INC.

AttachmentA:

Records Search Map ,
625
15 ARGONAUT PROJECT

RECORDS SEARCH MAP
Source: USGS San Juan Capistrano 7.5' Quadrangle/ T07S, R08W, sec 4, 5, 32, 33.

Project Site USGS San Juan Capistrano 7.5' Quadrangle/ T07S, R08W, sec 4. 2,000 1,000 0 2,000
Feet
Exhibit 1
Local Vicinity Map, Topographic Base
FCS 65130001 • 04/2026 I 1_Iocal_vicinity_topo.aprx
626
May 7, 2026
Santa Rosa Band of Cahuilla Indians
Vanessa Minott, Tribal Administrator
P.O. Box 391820
Anza, CA 92539
Subject: 15 Argonaut Project
Dear Ms. Minott:

FirstCarbon Solutions(FCS) is preparing an Initial Study/Mitigated Negative Declaration for the proposed 15 Argonaut Project in the city of Aliso Viejo, California. As part of the environmental review process, we are reaching out to the tribes for any additional information that can be incorporated into our analysis.

As part of the cultural resources assessment, FCS conducted a Sacred Lands File (SLF) search and a California Historical ResourcesInformation System (CHRIS)search. The results of the SLF records search were positive. The CHRIS search found that there are seven pre-contact resources within the 0.5-mile search radius of the project site. Of these, one pre-contactresource was recorded within the project boundaries. Additionally,there are 24 studies within a 0.5-mile search radius ofthe projectsite, four of which addressthe project site. The Native American Heritage Commission (NAHC) suggested you might be able to provide further information. If you have any additional information regarding potential historic or cultural resources in proximity or relation to the proposed project area, we would greatly appreciate your input.

UNITED STATES
T +1 888 826 5814
T +1 714 508 4100
T 303 938 5500
F +1 714 508 4110
E [email protected]
Irvine
250 Commerce
Suite 210
Irvine, CA 92602
Bay Area
2999 Oak Road
Suite 250
Walnut Creek, CA 94597
Central Valley
7726N.FirstStreet
#413
Fresno, CA 93720
Inland Empire
967KendallDrive
#A-537
San Bernardino, CA 92407
Sacramento Valley
2351 Sunset Boulevard
Suite 170-301
Rocklin, CA 95765
Utah
2901 Bluegrass Boulevard
Suite 200-62
Lehi, UT 84043
Colorado
5480 Valmont Road
Suite 200
Boulder, CO 80301
Connecticut
2 Corporate Drive
Suite 450
Shelton, CT 06484
New York
10 Monument Street
Deposit, NY 13754
56Broome Corporate Parkway
Conklin, NY 13748
www.firstcarbonsolutions.com
FIRSTCARB0N S0LUTI0NS
FCS INTERNATIONAL, INC.
~ AN ADEC INNOVATION
627
Sincerely,
Stefanie Griffin, M.A., RPA
Senior Archaeologist
FirstCarbon Solutions
250 Commerce, Suite 210
Irvine, CA 92602
Enclosed
Attachment A: Record Search Map

FIRSTCARBON SOLUTIONSTM
628

FIRSTCARBON

SOLUTIONS
◄
FCS INTERNATIONAL. INC.

AttachmentA:

Records Search Map ,
629
15 ARGONAUT PROJECT

RECORDS SEARCH MAP
Source: USGS San Juan Capistrano 7.5' Quadrangle/ T07S, R08W, sec 4, 5, 32, 33.

Project Site USGS San Juan Capistrano 7.5' Quadrangle/ T07S, R08W, sec 4. 2,000 1,000 0 2,000
Feet
Exhibit 1
Local Vicinity Map, Topographic Base
FCS 65130001 • 04/2026 I 1_Iocal_vicinity_topo.aprx
630
May 7, 2026
Soboba Band of Luiseño Indians
Joseph Ontiveros, THPO
P.O. Box 487
San Jacinto, CA 92581
Subject: 15 Argonaut Project
Dear Mr. Ontiveros:

FirstCarbon Solutions(FCS) is preparing an Initial Study/Mitigated Negative Declaration for the proposed 15 Argonaut Project in the city of Aliso Viejo, California. As part of the environmental review process, we are reaching out to the tribes for any additional information that can be incorporated into our analysis.

As part of the cultural resources assessment, FCS conducted a Sacred Lands File (SLF) search and a California Historical ResourcesInformation System (CHRIS)search. The results of the SLF records search were positive. The CHRIS search found that there are seven pre-contact resources within the 0.5-mile search radius of the project site. Of these, one pre-contactresource was recorded within the project boundaries. Additionally,there are 24 studies within a 0.5-mile search radius ofthe projectsite, four of which addressthe project site. The Native American Heritage Commission (NAHC) suggested you might be able to provide further information. If you have any additional information regarding potential historic or cultural resources in proximity or relation to the proposed project area, we would greatly appreciate your input.

UNITED STATES
T +1 888 826 5814
T +1 714 508 4100
T 303 938 5500
F +1 714 508 4110
E [email protected]
Irvine
250 Commerce
Suite 210
Irvine, CA 92602
Bay Area
2999 Oak Road
Suite 250
Walnut Creek, CA 94597
Central Valley
7726N.FirstStreet
#413
Fresno, CA 93720
Inland Empire
967KendallDrive
#A-537
San Bernardino, CA 92407
Sacramento Valley
2351 Sunset Boulevard
Suite 170-301
Rocklin, CA 95765
Utah
2901 Bluegrass Boulevard
Suite 200-62
Lehi, UT 84043
Colorado
5480 Valmont Road
Suite 200
Boulder, CO 80301
Connecticut
2 Corporate Drive
Suite 450
Shelton, CT 06484
New York
10 Monument Street
Deposit, NY 13754
56Broome Corporate Parkway
Conklin, NY 13748
www.firstcarbonsolutions.com
FIRSTCARB0N S0LUTI0NS
FCS INTERNATIONAL, INC.
~ AN ADEC INNOVATION
631
Sincerely,
Stefanie Griffin, M.A., RPA
Senior Archaeologist
FirstCarbon Solutions
250 Commerce, Suite 210
Irvine, CA 92602
Enclosed
Attachment A: Record Search Map

FIRSTCARBON SOLUTIONSTM
632

FIRSTCARBON

SOLUTIONS
◄
FCS INTERNATIONAL. INC.

AttachmentA:

Records Search Map ,
633
15 ARGONAUT PROJECT

RECORDS SEARCH MAP
Source: USGS San Juan Capistrano 7.5' Quadrangle/ T07S, R08W, sec 4, 5, 32, 33.

Project Site USGS San Juan Capistrano 7.5' Quadrangle/ T07S, R08W, sec 4. 2,000 1,000 0 2,000
Feet
Exhibit 1
Local Vicinity Map, Topographic Base
FCS 65130001 • 04/2026 I 1_Iocal_vicinity_topo.aprx
634
May 7, 2026
Soboba Band of Luiseño Indians
Jessica Valdez, Cultural Resources Specialist
P.O. Box 487
San Jacinto, CA 92581
Subject: 15 Argonaut Project
Dear Ms. Valdez:

FirstCarbon Solutions(FCS) is preparing an Initial Study/Mitigated Negative Declaration for the proposed 15 Argonaut Project in the city of Aliso Viejo, California. As part of the environmental review process, we are reaching out to the tribes for any additional information that can be incorporated into our analysis.

As part of the cultural resources assessment, FCS conducted a Sacred Lands File (SLF) search and a California Historical ResourcesInformation System (CHRIS)search. The results of the SLF records search were positive. The CHRIS search found that there are seven pre-contact resources within the 0.5-mile search radius of the project site. Of these, one pre-contactresource was recorded within the project boundaries. Additionally,there are 24 studies within a 0.5-mile search radius ofthe projectsite, four of which addressthe project site. The Native American Heritage Commission (NAHC) suggested you might be able to provide further information. If you have any additional information regarding potential historic or cultural resources in proximity or relation to the proposed project area, we would greatly appreciate your input.

UNITED STATES
T +1 888 826 5814
T +1 714 508 4100
T 303 938 5500
F +1 714 508 4110
E [email protected]
Irvine
250 Commerce
Suite 210
Irvine, CA 92602
Bay Area
2999 Oak Road
Suite 250
Walnut Creek, CA 94597
Central Valley
7726N.FirstStreet
#413
Fresno, CA 93720
Inland Empire
967KendallDrive
#A-537
San Bernardino, CA 92407
Sacramento Valley
2351 Sunset Boulevard
Suite 170-301
Rocklin, CA 95765
Utah
2901 Bluegrass Boulevard
Suite 200-62
Lehi, UT 84043
Colorado
5480 Valmont Road
Suite 200
Boulder, CO 80301
Connecticut
2 Corporate Drive
Suite 450
Shelton, CT 06484
New York
10 Monument Street
Deposit, NY 13754
56Broome Corporate Parkway
Conklin, NY 13748
www.firstcarbonsolutions.com
FIRSTCARB0N S0LUTI0NS
FCS INTERNATIONAL, INC.
~ AN ADEC INNOVATION
635
Sincerely,
Stefanie Griffin, M.A., RPA
Senior Archaeologist
FirstCarbon Solutions
250 Commerce, Suite 210
Irvine, CA 92602
Enclosed
Attachment A: Record Search Map

FIRSTCARBON SOLUTIONSTM
636

FIRSTCARBON

SOLUTIONS
◄
FCS INTERNATIONAL. INC.

AttachmentA:

Records Search Map ,
637
15 ARGONAUT PROJECT

RECORDS SEARCH MAP
Source: USGS San Juan Capistrano 7.5' Quadrangle/ T07S, R08W, sec 4, 5, 32, 33.

Project Site USGS San Juan Capistrano 7.5' Quadrangle/ T07S, R08W, sec 4. 2,000 1,000 0 2,000
Feet
Exhibit 1
Local Vicinity Map, Topographic Base
FCS 65130001 • 04/2026 I 1_Iocal_vicinity_topo.aprx
638
May 7, 2026
Gabrielino/Tongva Nation
Sandonne Goad, Chairperson
13191 Crossroads Parkway North, Suite 375
City of Industry, CA 91746
Subject: 15 Argonaut Project
Dear Chairperson Goad:

FirstCarbon Solutions(FCS) is preparing an Initial Study/Mitigated Negative Declaration for the proposed 15 Argonaut Project in the city of Aliso Viejo, California. As part of the environmental review process, we are reaching out to the tribes for any additional information that can be incorporated into our analysis.

As part of the cultural resources assessment, FCS conducted a Sacred Lands File (SLF) search and a California Historical ResourcesInformation System (CHRIS)search. The results of the SLF records search were positive. The CHRIS search found that there are seven pre-contact resources within the 0.5-mile search radius of the project site. Of these, one pre-contactresource was recorded within the project boundaries. Additionally,there are 24 studies within a 0.5-mile search radius ofthe projectsite, four of which addressthe project site. The Native American Heritage Commission (NAHC) suggested you might be able to provide further information. If you have any additional information regarding potential historic or cultural resources in proximity or relation to the proposed project area, we would greatly appreciate your input.

UNITED STATES
T +1 888 826 5814
T +1 714 508 4100
T 303 938 5500
F +1 714 508 4110
E [email protected]
Irvine
250 Commerce
Suite 210
Irvine, CA 92602
Bay Area
2999 Oak Road
Suite 250
Walnut Creek, CA 94597
Central Valley
7726N.FirstStreet
#413
Fresno, CA 93720
Inland Empire
967KendallDrive
#A-537
San Bernardino, CA 92407
Sacramento Valley
2351 Sunset Boulevard
Suite 170-301
Rocklin, CA 95765
Utah
2901 Bluegrass Boulevard
Suite 200-62
Lehi, UT 84043
Colorado
5480 Valmont Road
Suite 200
Boulder, CO 80301
Connecticut
2 Corporate Drive
Suite 450
Shelton, CT 06484
New York
10 Monument Street
Deposit, NY 13754
56Broome Corporate Parkway
Conklin, NY 13748
www.firstcarbonsolutions.com
FIRSTCARB0N S0LUTI0NS
FCS INTERNATIONAL, INC.
~ AN ADEC INNOVATION
639
Sincerely,
Stefanie Griffin, M.A., RPA
Senior Archaeologist
FirstCarbon Solutions
250 Commerce, Suite 210
Irvine, CA 92602
Enclosed
Attachment A: Record Search Map

FIRSTCARBON SOLUTIONSTM
640

FIRSTCARBON

SOLUTIONS
◄
FCS INTERNATIONAL. INC.

AttachmentA:

Records Search Map ,
641
15 ARGONAUT PROJECT

RECORDS SEARCH MAP
Source: USGS San Juan Capistrano 7.5' Quadrangle/ T07S, R08W, sec 4, 5, 32, 33.

Project Site USGS San Juan Capistrano 7.5' Quadrangle/ T07S, R08W, sec 4. 2,000 1,000 0 2,000
Feet
Exhibit 1
Local Vicinity Map, Topographic Base
FCS 65130001 • 04/2026 I 1_Iocal_vicinity_topo.aprx
642
1 5 A R G O N A U T P R O J E C T
65130001 • 04/2026 | 1_local_vicinity_topo.aprx
Exhibit 1
Source: USGS San Juan Capistrano 7.5' Quadrangle / T07S, R08W, sec 4, 5, 32, 33.

Project Site USGS San Juan Capistrano 7.5' Quadrangle / T07S, R08W, sec 4. ¥
2,000 1,000 0 2,000
Feet
F C S
Local Vicinity Map, Topographic Base

R E C O R D S S E A R C H M A P
Project Site
Half Mile Radius
643
Primary No. Trinomial
Resource List
Other IDs Type Age Attribute codes Recorded by Reports
6513.0001 15 Argonaut
P-30-000414 CA-ORA-000414 Resource Name - Jas-10 OR-00431, OR00702, OR-00926, OR-01073, OR01129, OR-01995,
OR-02089, OR03586
Site Prehistoric AP02; AP15
P-30-000419 CA-ORA-000419 Resource Name - CSRI 205 OR-00304, OR00431, OR-00702, OR-01439, OR01995, OR-02089
Site Prehistoric AP02; AP08
P-30-000420 CA-ORA-000420 OR-00431, OR00702, OR-00718, OR-01843, OR01995, OR-02089,
OR-03586, OR04103
Site Prehistoric AP02
P-30-000421 CA-ORA-000421 OR-00431, OR00702, OR-00926, OR-01129, OR01995
Site Prehistoric AP02; AP15
P-30-000824 CA-ORA-000824 Resource Name - CSRI 250 OR-00581, OR01121, OR-01122, OR-01337, OR01439, OR-02089
Site Prehistoric AP02; AP07; AP12
P-30-001006 CA-ORA-001006 Resource Name - AMH Golf
Course Archaeological Site
OR-01073, OR01127, OR-01721,
OR-02208
Site Prehistoric AP02; AP15
P-30-100178 Resource Name - AMH Golf
Course Isolate
Other Prehistoric AP02 OR-01721

Page 1 of 1 ends

644
Report List
Report No. Other IDs Year Author(s) Title Affiliation Resources 6513.0001 15 Argonaut
OR-00135 1977 Archaeological Survey Report on
Approximately a Twenty-one (21) Acre Parcel
Located in the El Toro Area of the County of
Orange
Scientific Resource
Surveys, Inc.

Whitney-Desautels,
Nancy A.

OR-00254 1977 Archaeological Report on the Aliso Creek
Specific Plan-planning Unit 1 Located in the
El Toro and Laguna Hills Area of the County
of Orange
Whitney-Desautels,
Nancy A.
30-000016, 30-000354, 30-000355,
30-000388, 30-000394, 30-000415,
30-000514, 30-000536, 30-000544,
30-000566, 30-000579, 30-000604,
30-000628, 30-000659
OR-00255 1977 Archaeological Report on the Aliso Creek
Corridor- Planning Units 2 & 3 Orange
County, California
Scientific Resource
Surveys, Inc.

Anonymous 30-000006, 30-000008, 30-000009,
30-000010, 30-000017, 30-000018,
30-000019, 30-000020, 30-000033,
30-000040, 30-000074, 30-000110,
30-000126, 30-000131, 30-000133,
30-000135, 30-000388, 30-000389,
30-000390, 30-000395, 30-000396,
30-000397, 30-000398, 30-000399,
30-000400, 30-000401, 30-000402,
30-000403, 30-000404, 30-000405,
30-000406, 30-000407, 30-000512,
30-000515, 30-000580
OR-00286 1979 Cultural Resources and the High Voltage
Transmission Line From San Onofre to
Santiago Substation and Black Star Canyon
Cultural Systems Research,
Inc.

Bean, Lowell 30-000001, 30-000002, 30-000003,
30-000004, 30-000005, 30-000007,
30-000011, 30-000012, 30-000013,
30-000014, 30-000015, 30-000016,
30-000017, 30-000018, 30-000019,
30-000020, 30-000021, 30-000022,
30-000023, 30-000024, 30-000025,
30-000026, 30-000027, 30-000028,
30-000029, 30-000030, 30-000031,
30-000032, 30-000033, 30-000034,
30-000037
OR-00304 1978 An Archaeological Assessment of Eight
Cultural Localities Along the San OnofreSantiago 220 Kv Transmission Line Dodge, William A. ARCSEARCH 30-000341, 30-000419, 30-000494, 30-000495, 30-000496, 30-000497,
30-000498, 30-000499

Page 1 of 4 ends

645
Report List
Report No. Other IDs Year Author(s) Title Affiliation Resources 6513.0001 15 Argonaut
OR-00431 1979 Aliso Viejo Cultural/scientific Resources Management Plan
Archaeological Resource
Management Corp.
30-000019, 30-000064, 30-000126,
30-000388, 30-000389, 30-000390,
30-000395, 30-000396, 30-000397,
30-000398, 30-000399, 30-000400,
30-000401, 30-000402, 30-000403,
30-000404, 30-000405, 30-000406,
30-000407, 30-000408, 30-000409,
30-000410, 30-000411, 30-000412,
30-000413, 30-000414, 30-000415,
30-000416, 30-000417, 30-000418,
30-000419, 30-000420, 30-000421,
30-000422, 30-000425, 30-000582,
30-000703
OR-00580 1977 The Aliso Creek Watershed, Orange County, California a Proposal for Creating an
Archaeological District for the National
Register of Historic Places and a Suggested
Research and Study Design
Scientific Resource
Surveys, Inc.

Anonymous
OR-00581 1982 Cultural Resources Data Recovery Program
for the 230kv Transmission Line Rights-ofway From San Onofre Nuclear Generating Station to Black Star Canyon and Santiago
Substation and to Encina and Mission Valley
Substations
Cultural Systems Research,
Inc.

McCoy, Lesley C. and
Kirkish, Alex N.
30-000438, 30-000447, 30-000495,
30-000496, 30-000498, 30-000499,
30-000725, 30-000824, 30-000825,
30-000830, 30-000831
OR-00702 1977 Cultural Scientific Resources Report on the Aliso Viejo Company Property Located in the
Southeastern Portion of the County of Orange
Scientific Resource
Surveys, Inc.

Scientific Resource
Surveys, Inc.
30-000006, 30-000013, 30-000017,
30-000019, 30-000020, 30-000126,
30-000177, 30-000266, 30-000388,
30-000389, 30-000390, 30-000395,
30-000396, 30-000397, 30-000398,
30-000399, 30-000400, 30-000401,
30-000402, 30-000403, 30-000404,
30-000405, 30-000406, 30-000407,
30-000408, 30-000409, 30-000410,
30-000411, 30-000412, 30-000413,
30-000414, 30-000415, 30-000416,
30-000417, 30-000418, 30-000419,
30-000420, 30-000421, 30-000422,
30-000425, 30-000581, 30-000582,
30-000604
Paleo -
OR-00705 1973 A Final Report on the Scientific Resources Survey for Moulton Ranch
Archaeological Research,
Inc.

Anonymous 30-000013, 30-000411

Page 2 of 4 ends

646
Report List
Report No. Other IDs Year Author(s) Title Affiliation Resources 6513.0001 15 Argonaut
OR-00720 1983 San Joaquin Transportation Corridor: an
Annotated List of Archaeological Reports
Referenced by Number.

Cottrell, Marie G. Unknown
OR-00926 1988 Archaeological Investigations at CA-ORA414, CA-ORA-421, and CA-ORA-1006, Laguna Hills, South Orange County, California
Archaeological Resource
Management Corporation
Demcak, Carol R. 30-000414, 30-000421, 30-001007
OR-00945 1982 Rossmoor Business Park Liquidating Trust
Properties
Van Horn, David M. Ultra Systems, Inc. 30-000610
OR-01073 1990 Archaeological Investigations at CA-ORA1006, Locus C Laguna Hills, South Orange County, California
Archaeological Resource
Management Corp.

Jones, Carleton S. and
Demcak, Carol R.
30-000414, 30-001006
OR-01129 1982 Cultural Resource Assessment: the Koll
Property Near Laguna Hills; a Possible
Annexation Area for the City of Irvine and its
Sphere of Influence
Archaeological Associates,
Ltd.

Van Horn, David M. 30-000014, 30-000015, 30-000016,
30-000267, 30-000268, 30-000414,
30-000415, 30-000421, 30-000432,
30-000551, 30-000604, 30-000610,
30-000823, 30-000854, 30-001007
OR-01337 1983 Report of Archaeological Investigations at CAORA-824: A Specialized Intermediate Campsite Located in the Sheep Hills of
Orange County
Archaeological Resource
Mgmt Corp
Del Chario, Kathleen C.
and Marie G. Cottrell
30-000824
OR-01350 1993 Archaeological Survey Report Historic Sites Addendum San Joaquin Hills Transportation
Corridor 12-ORA-73 12-102540
McKenna, Jeanette A. Chambers Group, Inc.
and Philip De Barros
30-000013, 30-000057, 30-000107,
30-000225, 30-001354
OR-01439 1980 National Register Assessment Program of
Cultural Resources of the 230 Kv
Transmission Line Rights-of-way From San
Onofre Nuclear Generating Station to Black
Star Canyon and Santiago Substation and to
Encina and Mission Valley Substation
McCoy, Lesley C. and Westec Services, Inc.

Phillips, Roxana
30-000419, 30-000438, 30-000447,
30-000495, 30-000496, 30-000498,
30-000499, 30-000640, 30-000700,
30-000725, 30-000782, 30-000784,
30-000785, 30-000786, 30-000787,
30-000823, 30-000824, 30-000825,
30-000826, 30-000827, 30-000828,
30-000829, 30-000830, 30-000831,
30-000832, 30-000905
OR-01717 1997 San Joaquin Hills Transportation Corridor Results of Construction Monitoring for
Archaeological Resources Mitigation
Monitoring Measures 11-1
Mason, Roger D. and Chambers Group, Inc.

Brechbiel, Brant A.
30-000107, 30-000125, 30-000206,
30-000225, 30-000270, 30-000389,
30-000689, 30-000736, 30-000802,
30-001029, 30-001081, 30-001295,
30-001357, 30-001358, 30-001370,
30-001398, 30-001431, 30-001432,
30-001433, 30-001436, 30-001438

Page 3 of 4 ends

647
Report List
Report No. Other IDs Year Author(s) Title Affiliation Resources 6513.0001 15 Argonaut
OR-01721 1998 Monitoring of Grading, CA-ORA-1006, Locus C, on the AMH Golf Course Property, Orange
County, California
Bissell, Ronald M. RMW Paleo Associates, Inc. 30-001006, 30-100178 OR-01721B 1998 Pollen, Phytolith, and Protein Residue
Analysis of a Metate Fragment from Site CaORA-1006, California Paleo Research
Laboratories
Cummings, Linda Scott,
Thomas E. Moutoux, and
Kathryn Puseman
OR-01843 1995 Archaeological Investigations at the Aliso Viejo Sites, South Orange, California
Archaeological Resource
Management Corp.

Demcak, Carol R. and
Maxwell, Pamela C.
30-000017, 30-000019, 30-000126,
30-000408, 30-000409, 30-000410,
30-000411, 30-000416, 30-000417,
30-000420, 30-000425, 30-000703,
30-001211, 30-001212, 30-001213
OR-02089 2000 Cultural Resource Assessment for Pacific
Bell Wireless Facility CM 368-01, County of
Orange, California
Lapin, Philippe LSA Associates, Inc. 30-000017, 30-000414, 30-000419, 30-000420, 30-000824
Cellular -
OR-02404 2001 Cultural Resource Assessment Cingular
Wireless Facility No. SC 021-06 Orange
County, California
Cellular - Duke, Curt LSA Associates, Inc.

OR-02414 2000 Review of Pacific Bell Wireless Facility CM 368-01, County of Orange, California
Cellular - Duke, Curt LSA Associates, Inc.

Page 4 of 4 ends

648
FCS
Appendix D:

Geology and Soils Supporting Information
•• • FCS
An ADEC Innovation
649

THIS PAGE INTENTIONALLY LEFT BLANK
650
Corona Office
Phone: 951.509.7090
BRANDYWINE HOMES September 26, 2025
2355 Main Street Project No. 1-0631
Irvine, CA 92614
Attention: Mr. Emmanuel Robinson
Subject: GEOTECHNICAL INVESTIGATION
15 Argonaut,
City of Aliso Viejo, County of Orange, California
References: Appendix A
Dear Mr. Robinson:

Alta California Geotechnical, Inc. (Alta) is pleased to present this geotechnical investigation for the proposed residential development of 15 Argonaut, located in the City of Aliso Viejo, County of Orange, California. This report is based on a recent subsurface investigation conducted by Alta, laboratory testing, and Alta’s staff’s experience with similar projects in this vicinity.

Alta’s review of the data indicates that the proposed development is feasible, from a geotechnical perspective, provided that the recommendations presented in this report are incorporated into the grading and improvement plans and implemented during site development.

Included in this report are:
 Discussion of the site geotechnical conditions.
 Recommendations for remedial and site grading, including unsuitable soil removals.  Geotechnical site construction recommendations.
 Foundation design parameters.

ALTA CALIFORNIA

GEOTECHNICAL INC,
170 North Maple Street, Suite 108
Corona, CA 92880
www.altageotechnical .com
651
Project Number 1-0631 Page ii
September 26, 2025
ALTA CALIFORNIA GEOTECHNICAL, INC.

If you have any questions or should you require any additional information, please contact the undersigned at (951) 509-7090. Alta appreciates the opportunity to provide geotechnical consulting services for your project.

Sincerely,
Alta California Geotechnical, Inc. Reviewed By:
________________________________
YOUSSEF F. HIJAZI
Engineering Geology Associate
________________________________
LOGAN A. MARQUETTE
Civil Engineering Associate
___________________________________
SCOTT A. GRAY/RGE 2857
Reg. Exp.: 12-31-26
Registered Geotechnical Engineer
President
________________________________
FRANK J. ECHENIQUE/CEG 2134
Reg. Exp.: 7-31-26
Engineering Geologist
Manager of Geologic Services
Distribution: (1) Addressee
YFH:LAM:SAG:FJE -1-0631, September 26, 2025 (Geotechnical Investigation, 15 Argonaut, Aliso Viejo)

652
Project Number 1-0631 Page iii
September 26, 2025
ALTA CALIFORNIA GEOTECHNICAL, INC.

1.0 INTRODUCTION ..................................................................................................................... 1

1.1 Purpose ............................................................................................................................. 1

1.2 Scope of Work .................................................................................................................. 1

1.3 Report Limitations ............................................................................................................ 1

2.0 PROJECT DESCRIPTION .......................................................................................................... 2

2.1 Site Location and Background .......................................................................................... 2

2.2 Proposed Development.................................................................................................... 2

3.0 SITE INVESTIGATION AND LABORATORY TESTING ............................................................... 2

3.1 Subsurface Investigation .................................................................................................. 2

3.2 Infiltration Testing ............................................................................................................ 3

4.0 GEOLOGIC CONDITIONS ........................................................................................................ 3

4.1 Geologic and Geomorphic Setting ................................................................................... 3

4.2 Stratigraphy ...................................................................................................................... 4

4.2.1 Monterey Formation (map symbol Tmy).................................................................... 4

4.3 Geologic Structure ............................................................................................................ 4

4.3.1 Tectonic Framework ................................................................................................... 4

4.3.2 Regionally Mapped Active Faults ................................................................................ 5

4.3.3 Geologic Structure ...................................................................................................... 5

4.4 Groundwater .................................................................................................................... 5

4.5 Earthquake Hazards ......................................................................................................... 6

4.5.1 Local and Regional Faulting ........................................................................................ 6

4.5.2 Surface Rupture .......................................................................................................... 6

4.5.3 Seismicity .................................................................................................................... 7

4.5.4 Landslide Potential ...................................................................................................... 7

4.5.5 Liquefaction ................................................................................................................ 7

5.0 ENGINEERING PROPERTIES AND ANALYSIS .......................................................................... 8

5.1 Materials Properties ......................................................................................................... 8

5.1.1 Excavation Characteristics .......................................................................................... 8

5.1.2 Compressibility ............................................................................................................ 8

5.1.3 Hydro-Consolidation ................................................................................................... 8

5.1.4 Expansion Potential .................................................................................................... 9

5.1.5 Earthwork Adjustments .............................................................................................. 9

5.1.6 Chemical Analyses ..................................................................................................... 10 653
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5.2 Engineering Analysis ....................................................................................................... 10

5.2.1 Bearing Capacity and Lateral Earth Pressures .......................................................... 10

6.0 CONCLUSIONS AND RECOMMENDATIONS ......................................................................... 11

6.1 Remedial Grading Recommendations ............................................................................ 11

6.1.1 Site Preparation ........................................................................................................ 11

6.1.2 Unsuitable Soil Removals .......................................................................................... 12

6.2 General Earthwork Recommendations .......................................................................... 13

6.2.1 Compaction Standards .............................................................................................. 13

6.2.2 Groundwater/Seepage ............................................................................................. 13

6.2.3 Documentation of Removals .................................................................................... 13

6.2.4 Treatment of Removal Bottoms ............................................................................... 14

6.2.5 Fill Placement ............................................................................................................ 14

6.2.6 Mixing ........................................................................................................................ 14

6.2.7 Import Soils ............................................................................................................... 14

6.2.8 Utility Trenches ......................................................................................................... 15

6.2.8.1 Excavation ....................................................................................................................................... 15

6.2.8.2 Backfill ............................................................................................................................................. 15

6.3 Slope Stability ................................................................................................................. 16

7.0 DESIGN CONSIDERATIONS .................................................................................................. 16

7.1 Structural Design ............................................................................................................ 16

7.1.1 Foundation Design .................................................................................................... 17

7.1.2 Post-Tensioning Slabs/Foundation Design Recommendations ................................ 17

7.2 Moisture Barrier ............................................................................................................. 18

7.3 Seismic Design ................................................................................................................ 19

7.4 Fence and Garden Walls................................................................................................. 20

7.5 Footing Excavations ........................................................................................................ 20

7.6 Retaining Walls ............................................................................................................... 20

7.7 Exterior Slabs and Walkways ......................................................................................... 22

7.7.1 Subgrade Compaction ............................................................................................... 22

7.7.2 Subgrade Moisture ................................................................................................... 22

7.7.3 Concrete Slab Thickness ........................................................................................... 22

7.7.4 Concrete Slab Reinforcement ................................................................................... 22

7.7.5 Control Joints ............................................................................................................ 23

7.8 Concrete Design ............................................................................................................. 23 654
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7.9 Corrosion ........................................................................................................................ 23

7.10 Pavement Design ............................................................................................................ 24

8.0 LOT MAINTENANCE ............................................................................................................. 25

8.1 Lot Drainage ................................................................................................................... 25

8.2 Burrowing Animals ......................................................................................................... 25

9.0 FUTURE PLAN REVIEWS ...................................................................................................... 25

10.0 CLOSURE........................................................................................................................ 26

10.1 Geotechnical Review ...................................................................................................... 26

10.2 Limitations ...................................................................................................................... 26 APPENDIX A: REFERENCES
APPENDIX B: SUBSURFACE INVESTIGATION
APPENDIX C: LABORATORY TESTING
APPENDIX D: MAINTENANCE CONSIDERATIONS
APPENDIX E: EARTHWORK SPECIFICATIONS
APPENDIX F: GRADING DETAILS
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1.0 INTRODUCTION
This report presents Alta’s findings, conclusions, and geotechnical recommendations for the proposed development of 15 Argonaut, located in the City of Aliso Viejo, County of Orange, California.

1.1 Purpose
The purpose of this report is to examine the existing onsite geotechnical conditions and assess the impacts that the geotechnical conditions may have on the proposed development. This report is suitable for use in developing grading plans and engineer’s cost estimates.

1.2 Scope of Work
Alta’s Scope of Work for this geotechnical investigation included the following:
 Reviewing the referenced reports and air photos (Appendix A).  Site geologic mapping.
 Excavating, logging, and sampling four (4) hollow stem auger borings to a maximum depth of 51.5-feet below the existing surface (Appendix B).  Conducting laboratory testing on samples obtained during our investigation (Appendix C).
 Conducting two (2) infiltration tests in two (2) additional borings at a maximum depth of 5.0-feet below the ground surface.
 Evaluating engineering geologic and geotechnical engineering data, including laboratory data, to develop recommendations for site remedial grading, import soil, foundations, and utilities.
 Preparing this report and accompanying exhibits.

1.3 Report Limitations
The conclusions and recommendations presented in this report are based on the field and laboratory information generated during this investigation, and a review of the referenced reports. The information contained in this report is intended to be used for development of grading plans and preliminary construction cost estimates.
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2.0 PROJECT DESCRIPTION

2.1 Site Location and Background
The irregular-shaped, approximately 4.6-acre site is bounded to the north by Glenwood Drive, to the west by Aliso Creek Road, and to the east and south by existing developments. The site is currently occupied by a commercial building and associated parking.

Historic aerial images are available as far back as 1938 and indicate the site was originally vacant. By 1992, the commercial building was constructed along with associated parking. The site has remained relatively unchanged since (Historic Aerials, 2025).

2.2 Proposed Development
The site will be redeveloped to support a residential development consisting of 58 single-family residential structures and associated improvements. Alta anticipates that conventional cut-and-fill grading techniques will be used to develop the site for the support of wood-frame construction with shallow foundations and reinforced concrete slabs-on-grade, and associated improvements.

3.0 SITE INVESTIGATION AND LABORATORY TESTING

3.1 Subsurface Investigation
Alta conducted a subsurface investigation on August 27th, 2025, consisting of the drilling, logging, and select sampling of four (4) hollow stem auger borings up to a maximum depth of 51.5-feet below the ground surface. The locations of the exploratory borings and excavations are shown on Plate 1 and the logs are presented in Appendix B.

Laboratory testing was performed on bulk samples obtained during the field investigation. A brief description of the laboratory test procedures and the test results are presented in Appendix C.
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3.2 Infiltration Testing
It is Alta’s understanding that the project may utilize infiltration systems for storm water disposal. Details of the system are not known at this time.

Infiltration testing was conducted in two (2) boring wells at a depth of 5.0-feet below the ground surface at specified locations. The testing was performed in general conformance with the County of Orange WQMP specifications. The testing wells were presoaked for more than 24 hours prior to testing. During testing, the water level readings were recorded every 10 to 30 minutes until the readings stabilized.

The data was then adjusted to provide an infiltration rate utilizing the Porchet Method. The resulting field infiltration rates, with no factor of safety, are summarized below in Table 3-1.

Table 3-1
Summary of Infiltration Testing
(No Factor of Safety)
Test Designation P-1 P-2
Approximate Depth of Test 5.0 ft 5.0 ft
Final Time Interval 10 minutes 10 minutes
Radius of Test Hole 4 inches 4 inches
Tested Infiltration Rate 0.03 in/hr 0.00 in/hr

4.0 GEOLOGIC CONDITIONS

4.1 Geologic and Geomorphic Setting
Regionally, the subject site is located in the Peninsular Ranges geomorphic province, which characterizes the southwest portion of southern California where right-lateral major active fault zones predominately trend northwestsoutheast. The Peninsular Ranges province is composed of plutonic and metamorphic rock, with lesser amounts of Tertiary volcanic and sedimentary rock, Quaternary drainage in-fills and sedimentary veneers. 658
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4.2 Stratigraphy
Based on our literature review and subsurface investigation, the subject site is underlain by the Monterey Formation (CDC, 2001, Figure 1). The geologic unit is briefly described below.

4.2.1 Monterey Formation (map symbol Tmy)
The Miocene-age Monterey Formation observed onsite primarily consists of silty sandstone, clayey sandstone, sandy claystone, sandstone, and claystone. The fine grained silty sandstone onsite is pale brown, white, dark yellowish brown, and brown in a slightly moist to moist and medium dense to very dense condition. The fine grained clayey sandstone onsite is pale brown, white, dark brown, brown, gray, light gray, dark grayish brown, and bluish gray in a slightly moist to moist and medium dense to dense condition. The sandy claystone onsite is dark brown, brown, and gray in a moist and stiff to very stiff condition. The very fine to fine grained sandstone onsite is pale brown, yellowish brown, grayish pale brow, and orange in a slightly moist and medium dense to very dense condition. The claystone onsite is dark brown to brown in a moist and very stiff condition. This unit was logged to a depth of 51.5 feet below the ground surface and is overlain by a thin layer of asphalt.

4.3 Geologic Structure

4.3.1 Tectonic Framework
Jennings (1985) defined eight structural provinces within California that have been classified by predominant regional fault trends and similar fold structure. These provinces are in turn divided into blocks and sub-blocks that are defined by “major Quaternary faults.” These blocks and subblocks exhibit similar structural features. Within this framework, the subject site is located within Structural Province I, which is controlled by 659
Figure 1
Project Name: 15 Argonaut
Project No.: 1-0631
Date: 9/26/2025
Site Location
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GEOLOGI MAP OF ORANGE CO T C LIF R IA,

ALTA CALIFORNIA

GEOTECHNICAL INC,

SHOW G MI ES AND MI ERAL DEPO ITS
Compiled by P. K. Morton ond R. . Mille r
JO 1
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the dominant northwest trend of the San Andreas Fault and is divided into two blocks, the Coast Range Block and the Peninsular Block. The Peninsular Range Block, on which this site is located, is characterized by a series of parallel, northwest trending faults that exhibit right-lateral strike-slip movement. These faults are terminated by the Transverse Range block to the north and extend southward into the Baja Peninsula.

These northwest trending faults divide the Peninsular Range block into eight sub-blocks. The site is located in the northwestern portion of the Santa Ana sub-block, one of the eight sub-blocks, which is bound on the east by the Elsinore fault zone and on the west by the NewportInglewood fault zone.

4.3.2 Regionally Mapped Active Faults
Several large, active fault systems including the Elsinore and NewportInglewood faults occur in the region surrounding the site. These fault systems have been studied extensively and in a large part control the geologic structure of southern California.

4.3.3 Geologic Structure
Based upon our literature review, the younger fan deposits are of Quaternary age and are not folded or faulted.

4.4 Groundwater
Groundwater was not encountered during our subsurface investigation. Based on state-provided information, the historic-high groundwater is greater than

20.0 feet below the ground surface (CGS, 2001). The most recent groundwater data retrieved from the nearest groundwater monitoring site, site ID 336555N1176965W001, was recorded in 2024 and indicates groundwater was approximately greater than 60.0-feet at that time (CDWR, 2025). 661
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4.5 Earthquake Hazards
The subject site is located in southern California, which is a tectonically active area. The type and magnitude of seismic hazards affecting a site are dependent on the distance to the causative fault and the intensity and magnitude of the seismic event. The seismic hazard may be primary, such as surface rupture and/or ground shaking, or secondary, such as liquefaction and/or ground lurching.

4.5.1 Local and Regional Faulting
The site is located in the northwestern portion of the Santa Ana subblock. The closest known active faults and their distances to the site are presented on Table 4-1 below.

TABLE 4-1
Local and Regional Faulting
Fault Zone Distance to Fault Zone
San Joaquin Hills 2.2 miles
Newport-Inglewood 7.1 miles
Elsinore 18.0 miles
Chino 18.4 miles
Palos Verdes 21.7 miles
Puente Hills (Coyote Hills) 22.1 miles
Coronado Bank 24.2 miles
Puente Hills (Santa Fe Springs) 28.6 miles

4.5.2 Surface Rupture
Active faults are not known to exist within the project and a review of Special Publication 42 indicates the site is not within a California State designated earthquake fault zone. Accordingly, the potential for fault surface rupture on the subject site is very low.
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4.5.3 Seismicity
Ground shaking hazards caused by earthquakes along other active regional faults do exist. The 2022 California Building Code requires usemodified spectral accelerations and velocities for most structural designs.

Seismic design parameters using soil profile types identified in the 2022 California Building Code are presented in Section 7.3.

4.5.4 Landslide Potential
Based on a review of the Seismic Hazard Zone Report for the San Juan Capistrano Quadrangle, the slope superjacent to the site is within an area with landslide potential. Further discussion into this hazard and its effects on the proposed project are presented in Section 6.3.

4.5.5 Liquefaction
Seismic agitation of relatively loose saturated sands, silty sands, and some silts can result in a buildup of pore pressure. If the pore pressure exceeds the overburden stresses, a temporary quick condition known as liquefaction can occur. Liquefaction effects can manifest in several ways including: 1) loss of bearing; 2) lateral spread; 3) dynamic settlement; and 4) flow failure. Lateral spreading has typically been the most damaging mode of failure.

In general, the more recent that a sediment has been deposited, the more likely it will be susceptible to liquefaction. Other factors that must be considered are groundwater, confining stresses, relative density, and the intensity and duration of seismically induced ground shaking.

Based on State provided information, the site is not located within a liquefaction zone. Groundwater was not encountered during our investigation to a depth of 51.5-feet bgs. Based on density of the 663
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underlying formation, it is anticipated that the potential for liquefaction is nil.

5.0 ENGINEERING PROPERTIES AND ANALYSIS

5.1 Materials Properties
Presented herein is a general discussion of the engineering properties of the onsite materials that will be encountered during construction of the proposed project. Descriptions of the soil (Unified Soil Classification System) are presented on the logs in Appendices B.

5.1.1 Excavation Characteristics
Based on the data provided from the subsurface investigation, it is our opinion that the majority of the onsite materials possess favorable excavation characteristics such that conventional equipment can be utilized. Considerations should be given to the high moisture content of the diatomaceous soils encountered, as presented in the boring logs (Appendix B).

5.1.2 Compressibility
The upper portions of the Monterey Formation onsite are considered compressible and unsuitable to support the proposed improvements.

Recommended removal depths are presented in Section 6.1.2.

As noted in the boring logs (Appendix B), the onsite soils are diatomaceous. Considerations should be given to the low dry density and high moisture content.

5.1.3 Hydro-Consolidation
Hydro-consolidation is the effect of introducing water into soil that is prone to collapse. Upon loading and initial wetting, the soil structure and apparent strength are altered resulting in almost immediate settlement. 664
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That settlement can have adverse impacts on engineered structures, particularly in areas where it is manifested differentially. Differential settlements are typically associated with differential wetting, irregularities in the subsurface soil conditions, or irregular loading patterns.

Based on laboratory testing (Appendix C), there is minimal potential for hydro-collapse in the Monterey Formation onsite.

5.1.4 Expansion Potential
Expansion index testing was performed on samples taken during our subsurface investigation. Based on laboratory results, it is anticipated that the majority of materials onsite are “low” to “medium” in expansion potential (21≤EI≤90, Appendix C) when tested per ASTM D: 4829.

5.1.5 Earthwork Adjustments
The values presented in Table 5-2 are deemed appropriate for estimating purposes and may be used in an effort to balance earthwork quantities.

As is the case with every project, contingencies should be made to adjust the earthwork balance when grading is in-progress and actual conditions are better defined.

TABLE 5-2
Earthwork Adjustment Factors
Geologic Unit
Adjustment Factor
Range
Average
Monterey Formation Shrink 4% to 8% 6%

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5.1.6 Chemical Analyses
Chemical testing was performed on samples of material underlying the proposed site. Soluble sulfate test results indicate that the soluble sulfate concentrations of the soils tested are classified as negligible (Category S0) per ACI 318-14.

Negligible chloride levels were detected in the onsite soils. Based on laboratory results of soluble sulfate, chloride, and pH testing as presented in Appendix C, the onsite soils are classified as “non-corrosive” to buried metals and concrete (Caltrans, 2022). Additional discussions on corrosion are presented in Section 7.9. Corrosion tests results are presented in Appendix C.

5.2 Engineering Analysis
Presented below is a general discussion of the engineering analysis methods that were utilized to develop the conclusions and recommendations presented in this report.

5.2.1 Bearing Capacity and Lateral Earth Pressures
Ultimate bearing capacity values were obtained using the graphs and formula presented in NAVFAC DM-7.1. Allowable bearing was determined by applying a factor of safety of at least 3 to the ultimate bearing capacity. Static lateral earth pressures were calculated using Rankine methods for active and passive cases. If it is desired to use Coulomb forces, a separate analysis specific to the application can be conducted.

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6.0 CONCLUSIONS AND RECOMMENDATIONS
Based on Alta’s findings during our subsurface investigation, the laboratory test results, and our staff’s previous experience in the area, it is Alta’s opinion that the development of the site is feasible from a geotechnical perspective. Presented below are recommendations that should be incorporated into site development and construction plans.

6.1 Remedial Grading Recommendations
All grading shall be accomplished under the observation and testing of the project geotechnical consultant in accordance with the recommendations contained herein and the City of Santa Ana criteria.

6.1.1 Site Preparation
Vegetation, construction debris, and other deleterious materials are unsuitable as structural fill material and should be disposed of offsite prior to commencing grading/construction. Any septic tanks, seepage pits or wells should be abandoned as per the County of Orange Department of Health Services.

Existing concrete should be removed prior to the placement of engineered fill. The demolished concrete may be incorporated into compacted, engineered fills after it is crushed to a maximum size of six (6) inches. Prior to placement as engineered fill any protruding steel rebar should be cut from the concrete pieces and disposed of offsite.

Existing asphaltic concrete should be removed prior to the placement of engineered fill. From a geotechnical perspective, this material may be incorporated into compacted, engineered fills after it is ground down to passing the #4 sieve.
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6.1.2 Unsuitable Soil Removals
The upper portions of alluvium are compressible and as such, are not suitable to support the proposed structures. Therefore, it is anticipated that, on average, the upper five (5) feet of existing soils will require removal and recompaction, extending a minimum of five (5) feet horizontally outside of the structures. This recommended removal combined with the foundation recommendations presented in Section

7.1 should provide suitable support for the proposed structures.

Footings for structures should be underlain by a minimum of three (3) feet of compacted fill. As such, for building pads where unsuitable soil removals do not provide the minimum depth of compacted fill, or where design grades and/or remedial grading activities create cut/fill transitions, the cut and shallow fill portions of the building pads should be over-excavated during grading and replaced with compacted fill. This condition shall be reviewed as foundation plans become available. The intent of this recommendations if for foundation loads to be encompassed within the engineered fill.

The Project Geotechnical Consultant should observe the removal bottom prior to placing fill. If unsuitable soils such as undocumented artificial fill is exposed upon the completion of the removals recommended above, additional removals may be required.

For fill areas in parking lots/drive aisles, in general, a minimum removal and recompaction of the upper two (2) feet is recommended, however all undocumented artificial fill shall be removed and recompacted. For cuts greater than two (2) feet in street areas, removals are not required. For 668
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cuts less than two (2) feet, the two (2) foot removal and recompaction applies.

6.2 General Earthwork Recommendations

6.2.1 Compaction Standards
All fill and processed natural ground shall be compacted to a minimum relative compaction of 90 percent, as determined by ASTM Test Method:

D-1557. Fill material should be moisture conditioned to optimum moisture or above, and as generally discussed in Alta’s Earthwork Specification Section presented in Appendix E. Compaction shall be achieved with the use of heavy earthwork equipment. Mixing and moisture conditioning will be required in order to achieve the recommended moisture conditions.

As noted in the boring logs (Appendix B), the onsite soils are diatomaceous. Considerations should be given to the low dry density and high moisture content. It is recommended to utilize a contractor familiar with the difficulty of conducting grading operations within diatomaceous soil. Slower production rates should be anticipated.

6.2.2 Groundwater/Seepage
Groundwater was not encountered during the subsurface investigation. It is not anticipated that groundwater will be encountered during construction. It is possible that perched groundwater conditions could be encountered depending on the time of year construction occurs.

6.2.3 Documentation of Removals
All removal/over-excavation bottoms should be observed and approved by the project Geotechnical Consultant prior to fill placement.

Consideration should be given to surveying the removal bottoms and undercuts after approval by the geotechnical consultant and prior to the 669
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placement of fill. Staking should be provided in order to verify undercut locations and depths.

6.2.4 Treatment of Removal Bottoms
At the completion of removals/over-excavation, the exposed removal bottom should be ripped to a minimum depth of eight (8) inches, moisture-conditioned to above optimum moisture content and compacted in-place to the project standards.

6.2.5 Fill Placement
After removals, scarification, and compaction of in-place materials are completed, additional fill may be placed. Fill should be placed in eightinch bulk maximum lifts, moisture conditioned or dried back so as to achieve optimum moisture content or above, compacted and tested as grading progresses until final grades are attained.

6.2.6 Mixing
Mixing of materials may be necessary to prevent layering of different soil types and/or different moisture contents. The mixing should be accomplished prior to and as part of compaction of each fill lift.

6.2.7 Import Soils
Import soils, if necessary, should consist of clean, structural quality, compactable materials similar to the on-site soils and should be free of trash, debris, or other objectionable materials. The project Geotechnical Consultant should be notified not less than 72 hours in advance of the locations of any soils proposed for import. Import sources should be sampled, tested, and approved by the project Geotechnical Consultant at the source prior to the importation of the soils to the site. The project Civil Engineer should include these requirements on plans and specifications for the project.
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6.2.8 Utility Trenches

6.2.8.1 Excavation
Utility trenches should be supported, either by laying back excavations or shoring, in accordance with applicable OSHA standards. In general, existing site soils are classified as Soil Type “B” and "C" per OSHA standards. Upon completion of the recommended removals and recompaction, the artificial fill will be classified as Soil Type "B". The Project
Geotechnical Consulting should be consulted if geologic conditions vary from what is presented in this report.

6.2.8.2 Backfill
Trench backfill should be compacted to at least 90 percent of maximum dry density as determined by ASTM D-1557.

Onsite soils will not be suitable for use as bedding material but will be suitable for use in backfill provided oversized materials are removed. Although suitable for backfill,
consideration should be given to utilizing imported materials as backfill materials. If native soils are to be used, slower production rates should be anticipated. No surcharge loads should be imposed above excavations. This includes spoil piles, lumber, concrete trucks, or other construction
materials and equipment. Drainage above excavations
should be directed away from the banks. Care should be
taken to avoid saturation of the soils. Compaction should be accomplished by mechanical means. Jetting of native soils will not be acceptable.
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Under-slab trenches should also be compacted to project specifications. If select granular backfill (SE > 30) is used, compaction by flooding will be acceptable.

6.3 Slope Stability
Surrounding the western and northern boundary of the site, adjacent to Glenwood Drive and Aliso Creek Road, is an approximately 50 foot slope ascending from the site. Within this slope is a landslide hazard mapped by the California Department of Conservation (CDMG, 2001). Based on a review of available data, the construction of the slope was completed during the grading of the existing structures or adjacent streets. Reports pertaining to this grading and any geologic / geotechnical reports pertaining to the hazard are not available from the City or the County. No visible instabilities were observed during our investigation. V-ditches are currently in place, and the existing slope is planted.

In consideration of the existing slope, the proposed structures have been setback from the toe of the slope in accordance with the requirements of the CBC.

Further review should be done as the project progresses. Additional recommendations pertaining to the grading and mitigation of the mapped hazard may be required based on conditions exposed during grading.

7.0 DESIGN CONSIDERATIONS

7.1 Structural Design
It is anticipated that multi-story residential structures with slab on-grade and shallow foundations will be constructed. Upon the completion of rough grading, finish grade samples should be collected and tested in order to provide specific recommendations as they relate to the individual building pads. These test 672
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results and corresponding design recommendations should be presented in a final rough grading report. Final slab and foundation design recommendations should be made based upon specific structure sitings, loading conditions, and asgraded soil conditions.

It is anticipated that the majority of onsite soils will possess “low” to “medium” expansion potential when tested in general accordance with ASTM Test Method D: 4829. Due to the inherent characteristics of diatomaceous soils, it is recommended to utilize post-tensioned foundations in the design of the project.

7.1.1 Foundation Design
Foundations may be preliminary designed based on the values presented in Table 7-1 below.

Table 7-1
Foundation Design Parameters*
Allowable Bearing 1500 lbs/ft2 (assuming a minimum embedment depth and width of 12 inches)
Lateral Bearing 250 lbs/ft2 at a depth of 12 inches plus 250 lbs/ft2 for each additional 12 inches of embedment to a maximum of 2000
lbs/ft2
.

Sliding Coefficient 0.30
Settlement Static Settlement – 0.5 inch in 40 feet
Dynamic Settlement – 0.5 inch in 40 feet
*These values may be increased as allowed by Code to resist transient loads such as wind or seismic. Building code and structural design considerations may govern depth and reinforcement requirements and should be evaluated.

7.1.2 Post-Tensioning Slabs/Foundation Design Recommendations Post-tensioned slabs for the project may be designed utilizing the parameters presented in Tables 7-1 and 7-2. The parameters presented herein are based on methodology provided in the Design of PostTensioned Slabs-On-Ground, Third Edition, by the Post-Tensioning Institute, in accordance with the 2022 CBC.

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TABLE 7-2

POST-TENSION SLAB DESIGN PARAMETERS
Category Expansion Potential Minimum
Embedment*
Edge Lift Center Lift
Em (ft) Ym
(inch) Em (ft) Ym (inch)
I Low 12 inches 5.4 0.61 9.0 0.26
II Medium 18 inches 5.0 1.10 9.0 0.46
Slab Subgrade Moisture
Category I Minimum 110% of optimum moisture to a depth of 12 inches prior to pouring concrete
Category II Minimum 120% of optimum moisture to a depth of 12 inches prior to pouring concrete
Embedment*
The minimum footing embedments presented herein are based on expansion indexes. The structural engineer should determine minimum embedments based on the number of floors supported by the footings, the structural loading, and the requirements of the latest California Building Code. If mat slabs are utilized, alternate embedment depths can be provided.

Moisture Barrier
A moisture barrier should be provided in accordance with the recommendations presented in Section 7.2 The parameters presented herein are based on procedures presented in the Design of Post-Tensioned Slabs-OnGround, Third Edition. No corrections for vertical barriers at the edge of the slab, or for adjacent vegetation have been assumed. The design parameters are based on a Constant Suction Value of 3.9 pF.

7.2 Moisture Barrier
A moisture and vapor retarding system should be placed below the slabs-ongrade in portions of the structure considered to be moisture sensitive and should be capable of effectively preventing the migration of water and reducing the transmission of water vapor to acceptable levels. Historically, a 10-mil plastic membrane, such as Visqueen, placed between two to four inches of clean sand, has been used for this purpose. The use of this system or other systems can be considered, at the discretion of the designer, provided the system reduces the vapor transmission rates to acceptable levels.

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7.3 Seismic Design
The site classes were determined based on the referenced reports and published geologic maps in the area in general conformance with Chapter 20 of ASCE 7-16.

Based on the density of the underlying soils, a Site Class of D (shear wave velocity of 259 m/s) was selected. The seismic design parameters were calculated using a program based on the USGS website and ASCE 7-16 procedures. The resulting values are presented in Table 7-3. These values are applicable providing the exceptions presented in Supplements 2 and 3 of ASCE 7- 16 are utilized in the design of the structure. If the design does not include the exception methodology, then a site-specific analysis shall be conducted.

TABLE 7-3 Seismic Ground Motion Values
2022 CBC and ASCE 7-16
Parameter Value
Site Class D
Site Latitude 33.5937
Site Longitude -117.7272
Spectral Response Acceleration Parameter, SS 1.22
Spectral Response Acceleration Parameter, S1 0.438
Site Coefficient, Fa 1.012
Site Coefficient, Fv 1.85
MCE Spectral Response Acceleration Parameter, SMS 1.235 MCE Spectral Response Acceleration Parameter, SM1 0.810 Design Spectral Response Acceleration Parameter, SDS 0.823 Design Spectral Response Acceleration Parameter, SD1 0.540 Peak Ground Acceleration, PGAM 0.568
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7.4 Fence and Garden Walls
Block walls, if used, should be embedded a minimum of 2 feet below the lowest adjacent grade. Construction joints (not more than 20 feet apart) should be included in the block wall construction. Side yard walls should be structurally separated from the rear yard wall.

7.5 Footing Excavations
Soils from the footing excavations should not be placed in slab-on-grade areas unless properly compacted and tested. The excavations should be cleaned of all loose/sloughed materials and be neatly trimmed at the time of concrete placement. The Project Geotechnical Consultant should observe the footing excavations prior to the placement of concrete to determine that the excavations are founded in suitably compacted material.

7.6 Retaining Walls
Retaining walls should be founded on engineered fill and should be backfilled with granular soils that allow for drainage behind the wall. Foundations may be designed in accordance with the recommendations presented in Table 7-1, above. Unrestrained walls, free to horizontally move 0.0005H (for dense cohesionless backfill), may be designed to resist lateral pressures imposed by a fluid with a unit weight determined in accordance with the Table 7-4 below. The table also presents design parameters for restrained (at-rest) retaining walls.

These parameters may be used to design retaining walls that may be considered as restrained due to the method of construction or location (corner sections of unrestrained retaining walls).

TABLE 7-4
Equivalent Fluid Pressures for 90% Compacted Fill (Select Material) Backfill Active Pressure (psf/ft) At-Rest Pressure (psf/ft) Level 35 55 I I
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Per the requirements of the 2022 CBC, the seismic force acting on the retaining walls with backfill exceeding 6-feet in height may be resolved utilizing the formula 12.5H2 lb/lineal ft (H=height of the wall). This force acts at approximately 0.6H above the base of the wall. The seismic value can be converted as required by the retaining wall engineer. Retaining walls should be designed in general accordance with Section 1807A.2 of the 2022 CBC.  Restrained retaining walls should be designed for “at-rest” conditions.  The design loads presented in the above table are to be applied on the retaining wall in a horizontal fashion and as such friction between wall and retained soils should not be allowed in the retaining wall analyses.  Additional allowances should be made in the retaining wall design to account for the influence of construction loads, temporary loads, and possible nearby structural footing loads.
 Select backfill should be granular, structural quality backfill with a Sand Equivalent of 20 or better and an ASCE Expansion Index of 20 or less. The backfill must encompass the full active wedge area. The upper one foot of backfill should be comprised of native on-site soils (see Plate A).  The wall design should include waterproofing (where appropriate) and backdrains or weep holes for relieving possible hydrostatic pressures. The backdrain should be comprised of a 4-inch perforated PVC pipe in a 1 ft. by 1 ft., ¾-inch gravel matrix, wrapped with a geofabric. The backdrain should be installed with a minimum gradient of 2 percent and should be outletted to an appropriate location. For subterranean walls this may include drainage by sump pumps.
 No backfill should be placed against concrete until minimum design strengths are achieved.

It should be noted that the allowable bearing and lateral bearing values presented in Table 7-1 are based on level conditions at the toe. Modified design parameters can be presented for retaining walls with sloping condition at the toe. Other conditions should be evaluated on a case-by-case basis. 677

RETAINING WALL BACKFILL DETAIL
NATIVE

BACKFILL
*OR AS MODIFIED
12 IN. MIN.

NATIVE OR

SELECT BACKFILL
/

BY A SPECIFIC REPORT
G)
rH/2 MIN.
. . .. ~ . . . .. . . • ... .. 0 d •
••:.· .- ,· ... '· ·:.

PROVIDE

DRAINAGE
SWALE

H DRAIN LATERALLY,

OR PROVIDE WEEP

HOLES AS REQUIRED

TO DRAIN
PIPE: 4-INCH PERFORATED PVC, SCHEDULE 40, SDR35 OR APPROVED ALTERNATE MINIMUM 8 PERFORATIONS (1/4-IN. DIA.) PER LINEAL FT. IN BOTTOM HALF OF PIPE
ROCK: MINIMUM VOLUME OF 1 CU. FT. OF 3/4-IN. MAX. ROCK PER. LINEAL FOOT

OF PIPE, OR APPROVED ALTERNATE
FILTER FABRIC: MIRAFI 140 FILTER FABRIC OR APPROVED EQUIVALENT A~ AL TA CALIFORNIA GEOTECHNICAL, INC , /L'\_'_'\ VER. 1/10 PATH:S:\Draftlng\ALTA GEOTECHNICAL\GRADING DETAILS\PLATE A,dwg

PLATE A
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7.7 Exterior Slabs and Walkways
Exterior concrete slabs and walkways should be designed and constructed in consideration of the following recommendations.

7.7.1 Subgrade Compaction
The subgrade below exterior concrete slabs should be compacted to a minimum of 90 percent relative compaction as determined by ASTM Test Method: D 1557.

7.7.2 Subgrade Moisture
The subgrade below concrete slabs should be moisture conditioned to a minimum of 110 percent (low expansion potential) or 120 percent (medium expansion potential) of optimum moisture prior to concrete placement

7.7.3 Concrete Slab Thickness
Concrete flatwork and driveways should be designed utilizing four-inch minimum thickness.

7.7.4 Concrete Slab Reinforcement
Utilization of reinforcement for flatwork and driveways is subject to a cost/benefit analysis. Reinforcement will decrease the amount of cracking that may occur in flatwork, however, planning for occasional repairs may be more cost effective. Utilizing closely spaced control joints is likely more cost-effective than utilizing reinforcement. The majority of the soils onsite are classified as very low in expansion potential.

Consideration should be given to reinforcing flatwork with irregular (nonsquare/rectangular) shapes or flatwork underlain by medium expansive soils. Reinforcement may consist of 6x6 W.14/W1.4 welded wire mesh or an equivalent section of rebar.
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7.7.5 Control Joints
Weakened plane joints should be installed on walkways at intervals of approximately eight feet (maximum) or less. Exterior slabs should be designed to withstand shrinkage of the concrete.

7.8 Concrete Design
As stated in Section 5.1.7, negligible concentrations of sulfates were detected in the onsite soils (Class S0). Therefore, the use of sulfate resistant concrete is not required per ACI 318-14 at this time. Post-grading conditions should be evaluated, and final recommendations made at that time.

7.9 Corrosion
Based on laboratory results of soluble sulfate, chloride, and pH testing as presented in Appendix C, the onsite soils are classified as “non-corrosive” to buried metals and concrete (Caltrans, 2022). Buried ferrous metals should be protected against the effects of corrosive soils in accordance with the manufacturer’s recommendations. Typical measures may include using noncorrosive backfill, protective coatings, wrapping, plastic pipes, or a combination of these methods. A corrosion engineer should be consulted if specific design recommendations are required by the improvement designer.

Per ACI 318-14, an exposure class of C1 would be applicable to metals encased in concrete (rebar in footings) due to being exposed to moisture from surrounding soils. Per Table 19.3.2.1 of ACI 318-14, the requirements for concrete with an exposure class of C1 are a minimum compressive strength of 2500 psi and a maximum water-soluble chloride ion content in concrete of 0.30 (percent by weight of cement).

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7.10 Pavement Design
Pavement sections for the proposed streets shall be designed based on laboratory testing conducted on samples taken from the soil subgrade.

Preliminarily, based on an assumed R-Value of 30, the pavement may be designed utilizing the sections presented in Table 7-5. These sections should be verified upon the completion of grading, based on R-Value testing. The ultimate pavement section design for public streets is under the City of Aliso Viejo’s purview.

Table 7-5
Preliminary Pavement Sections
Traffic
Index
Pavement Section Options
OR

5.0 3-inch AC on 6-inch AB 4-inch AC on 4-inch AB

5.5 3-inch AC on 7-inch AB 4-inch AC on 5-inch AB
AC-Asphalt Concrete
AB-Caltrans Class II Base
Construction of the streets should be accomplished in accordance with the current criteria of the City of Aliso Viejo. Prior to the placement of base material, the subgrade should be suitably moisture conditioned, processed and compacted to a minimum 95 percent of the laboratory maximum density (ASTM:

D 1557) to at least twelve (12) inches below subgrade. After subgrade compaction, the exposed grade should then be "proof"-rolled with heavy equipment to ensure the grade does not "pump" and is verified as non-yielding.

Aggregate base material should be placed on the compacted subgrade and compacted in-place to a minimum 95 percent of the laboratory standard obtained per ASTM: D 1557.

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8.0 LOT MAINTENANCE
Ongoing maintenance of the improvements is essential to the long-term performance of structures. As such, the owners must implement certain maintenance procedures. The attached " Maintenance and Improvement Considerations" presented in the Appendix E may be included as part of the sales packet to educate the owners in issues related to drainage, maintenance, improvements, etc. The following recommendations should also be implemented.

8.1 Lot Drainage
Roof, pad, and lot drainage should be collected and directed away from structures and slopes and toward approved disposal areas. Design fine grade elevations should be maintained throughout the life of the structure or if design fine grade elevations are altered, adequate area drains should be installed in order to provide rapid discharge of water, away from structures and slopes.

Residents should be made aware that they are responsible for maintenance and cleaning of all drainage terraces, down drains, and other devices that have been installed to promote structure and slope stability.

8.2 Burrowing Animals
Owners should undertake a program for the elimination of burrowing animals.

9.0 FUTURE PLAN REVIEWS
This report represents a geotechnical review of the site. As the project design for the project progresses, site specific geologic and geotechnical issues should be considered in the design and construction of the project. Consequently, future plan reviews may be necessary. These reviews may include reviews of:
 Grading Plans
 Foundation Plans
 Utility Plans
These plans should be forwarded to the project Geotechnical Consultant for review. 682
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10.0 CLOSURE

10.1 Geotechnical Review
For the purposes of this report, multiple working hypotheses were established for the project, utilizing the available data and the most probable model is used for the analysis. Future information collected during the proposed grading operations is intended to evaluate the hypothesis and as such, some of the assumptions summarized in this report may need to be changed. Some modifications of the grading recommendations may become necessary, should the conditions encountered in the field differ from the conditions hypothesized in this report.

Plans and sections of the project specifications should be reviewed by Alta to evaluate conformance with the intent of the recommendations contained in this report. If the project description or final design varies from that described in herein, Alta must be consulted regarding the applicability of the recommendations contained herein and whether any changes are required. Alta accepts no liability for any use of its recommendations if the project description or final design varies and Alta is not consulted regarding the alterations.

10.2 Limitations
This report is based on the following: 1) the project as presented on the attached plan; 2) the information obtained from Alta's laboratory testing included herein; and 3) from the information presented in the referenced reports. The findings and recommendations are based on the results of the subsurface investigation, laboratory testing, and office analysis combined with an interpolation and extrapolation of conditions between and beyond the subsurface excavation locations. However, the materials adjacent to or beneath those observed may have different characteristics than those observed, and no precise representations are made as to the quality or extent of the materials not 683
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ALTA CALIFORNIA GEOTECHNICAL, INC.
observed. The results reflect an interpretation of the direct evidence obtained.

Work performed by Alta has been conducted in a manner consistent with the level of care and skill ordinarily exercised by members of the geotechnical profession currently practicing in the same locality under similar conditions. No other representation, either expressed or implied, and no warranty or guarantee is included or intended.

The recommendations presented in this report are based on the assumption that an appropriate level of field review will be provided by a geotechnical consultant who is familiar with the design and site geologic conditions. That field review shall be sufficient to confirm that geotechnical and geologic conditions exposed during grading are consistent with the geologic representations and corresponding recommendations presented in this report.

The conclusions and recommendations included in this report are applicable to the specific design of this project as discussed in this report. They have no applicability to any other project or to any other location and any and all subsequent users accept any and all liability resulting from any use or reuse of the data, opinions, and recommendations without the prior written consent of Alta.

Alta has no responsibility for construction means, methods, techniques, sequences, procedures, safety precautions, programs in connection with the construction, acts or omissions of the CONTRACTOR or any other person performing any of the construction, or for the failure of any of them to carry out the construction in accordance with the final design drawings and specifications. 684
ALTA CALIFORNIA GEOTECHNICAL, INC.

APPENDIX A

REFERENCES
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September 26, 2025
ALTA CALIFORNIA GEOTECHNICAL, INC.

APPENDIX A
Selected References
California Code of Regulations, 2022, California Building Code, Title 24, Part 2, Volume 2, Based on the 2021 International Building Code, Effective Date January 1, 2023.

California Department of Conservation, Division of Mines and Geology, 2001, Seismic Hazard Zone Report for the San Juan Capistrano 7.5-Minute Quadrangle, Orange County, California, Seismic Hazard Zone Report 053.

California Department of Transportation (Caltrans), 2022, Caltrans Geotechnical Manual, published March, 2022.

California Geological Survey, 2008, Guidelines for Evaluating and Mitigating Seismic Hazards in California, Special Publication 117A.

California Geological Survey, 2018, Earthquake Fault Zones, A guide for Government Agencies, Property Owners/Developers, and Geoscience Practitioners for Assessing Fault Rupture Hazards in California, Special Publication 42, revised 2018, 83 pages.

Idriss, I.M. and Boulanger, R.W., 2008, Soil Liquefaction during Earthquakes, Oakland, California: Earthquake Engineering Research Institute.

Ishihara, K., and Yoshimine, M., 1992, Evaluation of settlements in sand deposits following liquefaction during earthquakes: Soil and Foundations, Japanese Society of Soil Mechanics and Foundation Engineering, v. 32, n. 1, p. 173-188.

Jennings, C.W., and Bryant, W.A., 2010, Fault Activity Map of California: California Geological Survey Geologic Data Map No. 6, map scale 1:750,000.

Jennings, C. W., and Bryant, W.A., 2010, An explanatory text to accompany the 1:750,000 scale fault and geologic map of California: California Division of Mines and Geology, special publication 42, revised 1985, 24 p.

Jennings, C. W., 1985, An explanatory text to accompany the 1:750,000 scale fault and geologic maps of California: California Division of Mines and Geology, Bulletin 201, 197 p.

U.S. Geological Survey, 2008, National Seismic Hazards Maps – Source Parameters, http://geohazards.usgs.gosv/cfusion/hazfaults_2008_search/query_main.cfm. 686
ALTA CALIFORNIA GEOTECHNICAL, INC.

APPENDIX B
Subsurface Investigation
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ALTA CALIFORNIA GEOTECHNICAL, INC.

APPENDIX B
Subsurface Investigation
Alta's subsurface investigation consisted of excavating, logging, and sampling four (4) hollowstem auger borings. Details of the subsurface investigation are presented in Table B. The approximate location of the exploratory excavation is shown on the accompanying Plate 1 and the Geotechnical Logs are attached.

TABLE B

SURFACE INVESTIGATION DETAILS
Equipment Range of
Depths
Sampling Methods Sample Locations
8” HollowStem Auger Up to 51.5
feet

1. Bulk

2. Ring

1. Bulk-Select Depths.

2. Ring-Every 2.5 or 5 feet.
688

UNIFIED SOIL CLASSIFICATION SYSTEM
Major Divisions grf ltr Description Major Divisions grf ltr ,-
. I GW Well-graded gravels or gravel sand
Gravel • mixtures, little or no fines
and
Gravelly -- Poorly-graded gravels or gravel
Soils I';., GP sand mixture, little or no fines
: • GM Silty gravels, gravel--sand-silt Fine
Silts
And
Clays
LL,<50
Inorganic silts and very fine sands,
ML rock flour, silty or clayey fine sands
or clavev silts with sliaht olasticitv
Inorganic clays of low to medium
plasticity, gravelly clays , sandy
clays, silty clays, lean clays
Coarse More
than 50%
of coarse
fraction
retained
on No,. 4
• mixtures
liiii,,+-+---- - --- - - ----1 Grained
~; GC
Organic silts and organic silt-clays
OL of low plasticity
Grained
sieve
Clayey gravels, gravel-sand-clay
mixtures Soils
Soils
/~. SW Well-gr~ded sands or gravelly More than
Sand f-i sands, little or no fines 50% passes Silts
And
Inorganic silts, micaceous or
MH diatomaceous fine or silty soils,
elastic silts
More than
50%
retained on
No. 200
sieve
and i;a•..,··_,· i---+-------- - - ----.1 0 11 No. 200 Inorganic clays of high plasticity, VH fat clays Sandy ···- Poorly-graded sands or gravelly sieve Soils • .• .-.-· SP sands. little or no fines · . •
_. •. SM Silty sands, sand-silt mixtures . •, ....

Clays ~
LL, <50 l"'f'',f---t---------------t
Organic clays of medium to high
OH plasticity More
than SO%
or coarse
fraction
passes
on No., 4 ~ sc Clayey sands, and-clay mixtures Highly Organic ::, PT Peat and other highly organic soils Soils - sieve
BOUNDARY CLASSIFICATION: Soils possessing characteristics of two groups are designated by combinations of group symbols.

PARTICLE SIZE LIMITS
U.S. STANDARD SERIES SIEVE CLEAR SQUARE SIEVE OPENINGS
200 40 10 4 3/4"
Silts
and
Clays Fine I

RELATIVE DENSITY
Sands and Gravels
Very Loose
Loose
Medium Dense
Dense
Very Dense
Blows/Foot (SPT)
<4
4-10
11-30
31-50
>50

LABO RA TORY TESTS
Symbol Test
Sand
Medium
Gravel
I Coarse Fine I Coarse

CONSISTENCY CLASSIFICATION
Silts and Clays. Criteria
Very Soft Thumb penetrates soil >1 in.

Soft Thumb penetrates soil 1 in.

Firm Thumb penetrates soil 1 /4 in.

Stiff Readily indented with thumbnail
Very Stiff Thumbnail will not indent soil
3" 12"
Cobbles Boulders

HARDNESS
Bedrock
Soft
Moderately Hard
Hard
Very Hard
DS
DSR
CON
SA
MAX
RV
Direct Shear SOIL MOISTURE SIZE PROPORTIONS
El
SE
AL
CHEM
HY
Direct Shear
(Remolded)
Sieve Analysis
Maximum Density
Resistance (R) Value
Expansion Index
Sand Equivalent
Atterberg Limits
Chemical Analysis
Hydrometer Analysis
Increasing Visual Moisture Content
l
Dry - Dry to touch
Moist - Damp, but no visible free water
wet - Visible free water
Trace - <5%
Few- 5 to 10%
Some - 15 to 25%
KEY TO EXPLORATORY BORING LOGS ~LTA CALIFORNIA GEOTECHNICAL INC.

PLATE 689 B
SM
SC
CL
SM
SC
SP

34.7 40.9

42.1 6.6

66.6 7.6

17.4 8.6
MONTEREY FORMATION (Tm): SILTY SANDSTONE, fine
grained, pale brown to white, slightly moist, medium dense, diatomaceous.
@2.5 ft. CLAYEY SANDSTONE, pale brown to white, moist, medium dense, diatomaceous.
@5.0 ft. white, slightly moist, dense, diatomaceous, some clay. @10.0 ft. dark brown, moist, dense.
@15.0 ft. dark brown to bluish gray, slightly moist, dense. @20.0 ft. SANDY CLAYSTONE, gray, moist, stiff, fine grained sand. @25.0 ft. SILTY SANDSTONE, fine grained, yellowish dark brown, slightly moist, very dense.
@30.0 ft. CLAYEY SANDSTONE, fine grained, dark brown to brown, moist, medium dense.
@35.0 ft. SANDSTONE, very fine to fine grained, pale brown, slightly moist, very dense.

Continued;
R
R
R
R
R
R
S
S
26 43
36 33
22 83
10,9,8
17,40,50
for 4"
83 31
90 30
91 40
MAX,
EI,
HY,
CHEM
CON,
HY
78 37
74 105
56 110
140 lbs
15 Argonaut
1 OF 2
30 in
460 B-1
5 10
15 20
25 30
35 TYPE OF DRILL RIG
DRILLER TYPE SAMPLE ELEV DRY (pcf) DENSITY
BORING DESIG.

DROP
DRIVE WT.

GW DEPTH (FT)

PROJECT NAME
DATE FINISHED YH DEPTH SAT- MOISTURE CONT (%)8/27/25
(%) URATION
DATE STARTED 8/27/25
460
455
450
445
440
435
430
425
420

GEOTECHNICAL DESCRIPTION OTHER TESTS

S SPT (SPLIT SPOON) SAMPLE

R RING (DRIVE) SAMPLE
SAMPLE TYPES:

SHEET
NOTE

LOGGED BY GROUP
J: JOINTING
B: BEDDING
S: SHEAR
C: CONTACT
F: FAULT
RS: RUPTURE SURFACE
1-0631

GROUNDWATER

SEEPAGE
(Feet)
PROJECT NO.

GEOTECHNICAL BORING LOG
GROUND ELEV.
8" Hollow Stem Auger
2R Drilling Inc. SYMBOL LITHOLOGY BLOWS

B BULK SAMPLE T TUBE SAMPLE
Alta California Geotechnical, Inc.

P.N. 1-0631 PLATE B-1
□
□
□ □ 690

10.0 8.7

20.1 Continued;
MONTEREY FORMATION (Tm) SANDSTONE, very fine to fine
grained, pale brown, slightly moist, very dense.
@50.0 ft. yellowish brown.

TOTAL DEPTH 51.5 FEET

NO GROUNDWATER ENCOUNTERED

NO CAVING OBSERVED
S
S
S
26,50 for
5"
29,50 for
5"
23,50 for
4"
140 lbs
15 Argonaut
2 OF 2
30 in
460 B-1
45 50

TYPE OF DRILL RIG
DRILLER TYPE SAMPLE ELEV DRY (pcf) DENSITY
BORING DESIG.

DROP
DRIVE WT.

GW DEPTH (FT)

PROJECT NAME
DATE FINISHED YH DEPTH SAT- MOISTURE CONT (%)8/27/25
(%) URATION
DATE STARTED 8/27/25
420
415
410

GEOTECHNICAL DESCRIPTION OTHER TESTS

S SPT (SPLIT SPOON) SAMPLE

R RING (DRIVE) SAMPLE
SAMPLE TYPES:

SHEET
NOTE

LOGGED BY GROUP
J: JOINTING
B: BEDDING
S: SHEAR
C: CONTACT
F: FAULT
RS: RUPTURE SURFACE
1-0631

GROUNDWATER

SEEPAGE
(Feet)
PROJECT NO.

GEOTECHNICAL BORING LOG
GROUND ELEV.
8" Hollow Stem Auger
2R Drilling Inc. SYMBOL LITHOLOGY BLOWS

B BULK SAMPLE T TUBE SAMPLE
Alta California Geotechnical, Inc.

P.N. 1-0631 PLATE B-1
-
-
-
-
-
-
-
-
-
-
-
□
□
□
-
-
-
-
->--
-
-
-
-
->--
-
-
-
~
□ 691
SP

9.0 7.2

8.7 6.5

5.3 5.7

7.3 6.9
MONTEREY FORMATION (Tm): SANDSTONE, fine grained,
grayish pale brown, slightly moist, dense.
@5.0 ft. medium dense, trace gravel.
@10.0 ft. very dense, some gravel.
@15.0 ft. very fine to fine grained, pale brown.
@25.0 ft. yellowish gray, some iron oxide staining.
@30.0 ft. pale brown, some iron oxide staining.
@35.0 ft. trace silt.

Continued;
R
R
R
R
R
R
S
S
41 27
53 50 for 5"
50 for 5"
50 for 4"
40,50 for
2"
47,50 for
3"
43 30
41 21
18 20
107
102
105
90 92
94 140 lbs
15 Argonaut
1 OF 2
30 in
461 B-2
5 10
15 20
25 30
35 TYPE OF DRILL RIG
DRILLER TYPE SAMPLE ELEV DRY (pcf) DENSITY
BORING DESIG.

DROP
DRIVE WT.

GW DEPTH (FT)

PROJECT NAME
DATE FINISHED YH DEPTH SAT- MOISTURE CONT (%)8/27/25
(%) URATION
DATE STARTED 8/27/25
460
455
450
445
440
435
430
425

GEOTECHNICAL DESCRIPTION OTHER TESTS

S SPT (SPLIT SPOON) SAMPLE

R RING (DRIVE) SAMPLE
SAMPLE TYPES:

SHEET
NOTE

LOGGED BY GROUP
J: JOINTING
B: BEDDING
S: SHEAR
C: CONTACT
F: FAULT
RS: RUPTURE SURFACE
1-0631

GROUNDWATER

SEEPAGE
(Feet)
PROJECT NO.

GEOTECHNICAL BORING LOG
GROUND ELEV.
8" Hollow Stem Auger
2R Drilling Inc. SYMBOL LITHOLOGY BLOWS

B BULK SAMPLE T TUBE SAMPLE
Alta California Geotechnical, Inc.

P.N. 1-0631 PLATE B-2
- -
- -
- -
- -
- ->-- -
- ->--
- -
- -
- -
- ->-- -
- ->--
- -
- -
- -
- ->-- -
- ->--
- -
- -
- -
- ->-- -
- ->--
- -
- -
- -
- ->-- -
- ->--
- -
- -
- -
- ->-- -
- -
- -
- -
- -
- ->-- -
- -
- -
- -
- -
_y:
□ ►
□
□ □ 692

9.6 13.2

9.4 Continued;
MONTEREY FORMATION (Tm): SAND, very fine to fine grained, pale brown, slightly moist, very dense, trace silt, some iron oxide staining.

TOTAL DEPTH 51.5 FEET

NO GROUNDWATER ENCOUNTERED

NO CAVING OBSERVED
S
S
S
36,50 for
3"
33, 50
for 4"
32,50 for
4"
140 lbs
15 Argonaut
2 OF 2
30 in
461 B-2
45 50

TYPE OF DRILL RIG
DRILLER TYPE SAMPLE ELEV DRY (pcf) DENSITY
BORING DESIG.

DROP
DRIVE WT.

GW DEPTH (FT)

PROJECT NAME
DATE FINISHED YH DEPTH SAT- MOISTURE CONT (%)8/27/25
(%) URATION
DATE STARTED 8/27/25
420
415
410

GEOTECHNICAL DESCRIPTION OTHER TESTS

S SPT (SPLIT SPOON) SAMPLE

R RING (DRIVE) SAMPLE
SAMPLE TYPES:

SHEET
NOTE

LOGGED BY GROUP
J: JOINTING
B: BEDDING
S: SHEAR
C: CONTACT
F: FAULT
RS: RUPTURE SURFACE
1-0631

GROUNDWATER

SEEPAGE
(Feet)
PROJECT NO.

GEOTECHNICAL BORING LOG
GROUND ELEV.
8" Hollow Stem Auger
2R Drilling Inc. SYMBOL LITHOLOGY BLOWS

B BULK SAMPLE T TUBE SAMPLE
Alta California Geotechnical, Inc.

P.N. 1-0631 PLATE B-2
-
-
-
-
-
-
-
-
-
-
-
□
□
□
-
-
-
-
->--
-
-
-
-
->--
-
-
-
~
□ 693
SC
SM

61.0 35.7

58.9 50.4

30.5 11.5
MONTEREY FORMATION (Tm): CLAYEY SANDSTONE, fine
grained, gray to white, moist, medium dense, diatomaceous. @5.0 ft. dark brown to grayish white.
@10.0 ft. some iron oxide staining.
@20.0 ft. dark grayish brown.
@25.0 ft. SILTY SANDSTONE, fine grained, brown, moist, medium dense.

TOTAL DEPTH 26.0 FEET

NO GROUNDWATER ENCOUNTERED

NO CAVING OBSERVED
R
B
R
R
R
R
R
24 24
21 26
25 26
84 78
87 93
89 55
CON,
HY
MAX,
EI,
HY,
CHEM
57 75
59 68
87 106
140 lbs
15 Argonaut
1 OF 1
30 in
458 B-3
5 10
15 20
25 TYPE OF DRILL RIG
DRILLER TYPE SAMPLE ELEV DRY (pcf) DENSITY
BORING DESIG.

DROP
DRIVE WT.

GW DEPTH (FT)

PROJECT NAME
DATE FINISHED YH DEPTH SAT- MOISTURE CONT (%)8/27/25
(%) URATION
DATE STARTED 8/27/25
455
450
445
440
435

GEOTECHNICAL DESCRIPTION OTHER TESTS

S SPT (SPLIT SPOON) SAMPLE

R RING (DRIVE) SAMPLE
SAMPLE TYPES:

SHEET
NOTE

LOGGED BY GROUP
J: JOINTING
B: BEDDING
S: SHEAR
C: CONTACT
F: FAULT
RS: RUPTURE SURFACE
1-0631

GROUNDWATER

SEEPAGE
(Feet)
PROJECT NO.

GEOTECHNICAL BORING LOG
GROUND ELEV.
8" Hollow Stem Auger
2R Drilling Inc. SYMBOL LITHOLOGY BLOWS

B BULK SAMPLE T TUBE SAMPLE
Alta California Geotechnical, Inc.

P.N. 1-0631 PLATE B-3
□
□
□ □ 694
SC
CL
CL
SC
CL

68.4 76.8

34.9 64.4

49.1 41.8
MONTEREY FORMATION (Tm): CLAYEY SANDSTONE, fine
grained, pale brown to white, moist, medium dense, diatomaceous. @10.0 ft. CLAYSTONE TO SANDY CLAYSTONE, dark brown to
brown, moist, very stiff.
@15.0 ft. SANDY CLAYSTONE, dark brown to brown, moist, very stiff.
@20.0 ft. CLAYEY SANDSTONE, very fine to fine grained, bluish gray, moist, medium dense.
@25.0 ft. SANDY CLAYSTONE, brown to dark brown, moist, very stiff, some iron oxide staining.

TOTAL DEPTH 26.0 FEET

NO GROUNDWATER ENCOUNTERED

NO CAVING OBSERVED
R
R
R
R
R
R
21 24
20 30
23 20
90 87
81 82
92 87
CON,
HY
CON,
HY
55 50
77 54
68 73
140 lbs
15 Argonaut
1 OF 1
30 in
459 B-4
5 10
15 20
25 TYPE OF DRILL RIG
DRILLER TYPE SAMPLE ELEV DRY (pcf) DENSITY
BORING DESIG.

DROP
DRIVE WT.

GW DEPTH (FT)

PROJECT NAME
DATE FINISHED YH DEPTH SAT- MOISTURE CONT (%)8/27/25
(%) URATION
DATE STARTED 8/27/25
455
450
445
440
435

GEOTECHNICAL DESCRIPTION OTHER TESTS

S SPT (SPLIT SPOON) SAMPLE

R RING (DRIVE) SAMPLE
SAMPLE TYPES:

SHEET
NOTE

LOGGED BY GROUP
J: JOINTING
B: BEDDING
S: SHEAR
C: CONTACT
F: FAULT
RS: RUPTURE SURFACE
1-0631

GROUNDWATER

SEEPAGE
(Feet)
PROJECT NO.

GEOTECHNICAL BORING LOG
GROUND ELEV.
8" Hollow Stem Auger
2R Drilling Inc. SYMBOL LITHOLOGY BLOWS

B BULK SAMPLE T TUBE SAMPLE
Alta California Geotechnical, Inc.

P.N. 1-0631 PLATE B-4
□
□
□ □ 695
SC MONTEREY FORMATION (Tm): CLAYEY SANDSTONE, fine
grained, pale brown to white, moist, medium dense, diatomaceous.

TOTAL DEPTH 5.0 FEET

NO GROUNDWATER ENCOUNTERED

NO CAVING OBSERVED
N/A
15 Argonaut
1 OF 1
N/A
458 P-1
5 TYPE OF DRILL RIG
DRILLER TYPE SAMPLE ELEV DRY (pcf) DENSITY
BORING DESIG.

DROP
DRIVE WT.

GW DEPTH (FT)

PROJECT NAME
DATE FINISHED YH DEPTH SAT- MOISTURE CONT (%)8/27/25
(%) URATION
DATE STARTED 8/27/25
455

GEOTECHNICAL DESCRIPTION OTHER TESTS

S SPT (SPLIT SPOON) SAMPLE

R RING (DRIVE) SAMPLE
SAMPLE TYPES:

SHEET
NOTE

LOGGED BY GROUP
J: JOINTING
B: BEDDING
S: SHEAR
C: CONTACT
F: FAULT
RS: RUPTURE SURFACE
1-0631

GROUNDWATER

SEEPAGE
(Feet)
PROJECT NO.

GEOTECHNICAL BORING LOG
GROUND ELEV.
8" Hollow Stem Auger
2R Drilling Inc. SYMBOL LITHOLOGY BLOWS

B BULK SAMPLE T TUBE SAMPLE
Alta California Geotechnical, Inc.

P.N. 1-0631 PLATE B-5
-
-
-
-
-
□
□
□
-
-
-
-
-
□ 696
SC MONTEREY FORMATION (Tm): CLAYEY SANDSTONE, fine
grained, pale brown to white, moist, medium dense, diatomaceous.

TOTAL DEPTH 5.0 FEET

NO GROUNDWATER ENCOUNTERED

NO CAVING OBSERVED
N/A
15 Argonaut
1 OF 1
N/A
460 P-2
5 TYPE OF DRILL RIG
DRILLER TYPE SAMPLE ELEV DRY (pcf) DENSITY
BORING DESIG.

DROP
DRIVE WT.

GW DEPTH (FT)

PROJECT NAME
DATE FINISHED YH DEPTH SAT- MOISTURE CONT (%)8/27/25
(%) URATION
DATE STARTED 8/27/25
460
455

GEOTECHNICAL DESCRIPTION OTHER TESTS

S SPT (SPLIT SPOON) SAMPLE

R RING (DRIVE) SAMPLE
SAMPLE TYPES:

SHEET
NOTE

LOGGED BY GROUP
J: JOINTING
B: BEDDING
S: SHEAR
C: CONTACT
F: FAULT
RS: RUPTURE SURFACE
1-0631

GROUNDWATER

SEEPAGE
(Feet)
PROJECT NO.

GEOTECHNICAL BORING LOG
GROUND ELEV.
8" Hollow Stem Auger
2R Drilling Inc. SYMBOL LITHOLOGY BLOWS

B BULK SAMPLE T TUBE SAMPLE
Alta California Geotechnical, Inc.

P.N. 1-0631 PLATE B-6
-
-
-
-
-
□
□
□
-
-
-
-
-
□ 697
ALTA CALIFORNIA GEOTECHNICAL, INC.

APPENDIX C
Laboratory Testing
698
Project Number 1-0631 Page C-1
September 26, 2025
ALTA CALIFORNIA GEOTECHNICAL, INC.

LABORATORY TESTING
The following laboratory tests were performed on a representative sample in accordance with the applicable latest standards or methods from the ASTM, California Building Code (CBC) and California Department of Transportation.

Classification
Soils were classified with respect to the Unified Soil Classification System (USCS) in accordance with ASTM D-2487 and D-2488.

Particle Size Analysis
Modified hydrometer testing was conducted to aid in classification of the soil. The results of the particle size analysis are presented in Table C.

Maximum Density/Optimum Moisture
The maximum dry density and optimum moisture content of two representative bulk samples were evaluated in accordance with ASTM D-1557. The results are summarized in Table C.

Expansion Index Tests
Two (2) expansion index test was performed to evaluate the expansion potential of typical onsite soil. Testing was carried out in general conformance with ASTM Test Method D-4829. The results are presented in Table C.

Chemical Analyses
Chemical testing was performed on two select samples by Alta. The results of these tests (sulfate content, resistivity, chloride content and pH) are presented on Table C.

Consolidation Tests
Consolidation testing was performed on four (4) relatively “undisturbed” soil samples at their natural moisture content in accordance with procedures outlined in ASTM D-2435. The samples were placed in a consolidometer and loads were applied incrementally in geometric progression. The samples (2.42-inches in diameter and 1-inch in height) were permitted to 699
Project Number 1-0631 Page C-2
September 26, 2025
ALTA CALIFORNIA GEOTECHNICAL, INC.
consolidate under each load increment until the slope of the characteristic linear secondary compression portion of the thickness versus log of time plot was apparent. The percent consolidation for each load cycle was recorded as the ratio of the amount of vertical compression to the original 1-inch height. The consolidation test results are shown on Plates C1 through C-4.

Atterberg Limits
Atterberg limits testing was performed on two select samples by Alta. The results of these tests are presented on Table C
700
Trench No.

Depth (Feet) Soil Description Group Symbol - Unified Soil Classification System Maximum Density (pcf) Optimum Moisture (%) Direct Shear Gravel (% + No. 4 Screen) % Sand %Silt (0.074 to 0.005mm) % Clay (-0.005 mm) Expansion IndexSulfate Content (%) Consolidation Other Tests Remarks B-1 2.5 Clayey Sandstone (Tm) SC 114.4 12.5 - 2 60 12 26 8 - MinResist: 1,619Ohm-cm
pH:7.4,Cl:115ppm,SO4:0.012%
LL:26,PL:16,PI:10
B-1 5 Claystone (Tm) CL - - - 0 14 34 52 - SEE PLATE C-1 B-3 5 Claystone with Sand (Tm) CL - - - 1 24 32 43 - SEE PLATE C-2 B-3 (Bulk) 5 Claystone with Sand (Tm) CL 77.0 35.6 - 5 20 23 52 38 MinResist: 1,485Ohm-cm
pH:7.4,Cl:195ppm,SO4:0.006%
LL:67,PL:44,PI:23
B-4 5 Claystone (Tm) CL - - - 1 10 34 55 - SEE PLATE C-3 B-4 10 Claystone (Tm) CL - - - 0 12 34 54 - SEE PLATE C-4

TABLE C

SUMMARY OF LABORATORY TEST DATA
P.N. 1-0631
Maximum Dry Density Grain Size Analysis
Alta California Geotechnical, Inc.
701
-2.0
-1.0
0 1.0

2.0 3.0

4.0 5.0

6.0 7.0

8.0 0.1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 910
REMARKS: WATER ADDED AT 1.07 TSF

CONSOLIDATION CURVE PERCENT CHANGE IN HEIGHT
PLATE C-1

COMPRESSIVE STRESS IN TSF
Alta California Geotechnical, Inc.

P.N. 1-0631
group typical names density (pcf) sieve (%) symbol

40.9 moist. (%)
dry in situ depth (ft.)
B-1 5.0
satur. (%)
37 -200
CL Claystone (Tm)
boring in situ
31 86
- -
- --- - - - ' '

I I I I I I I I I
702
-2.0
-1.0
0 1.0

2.0 3.0

4.0 5.0

6.0 7.0

8.0 0.1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 910
REMARKS: WATER ADDED AT 1.07 TSF

CONSOLIDATION CURVE PERCENT CHANGE IN HEIGHT
PLATE C-2

COMPRESSIVE STRESS IN TSF
Alta California Geotechnical, Inc.

P.N. 1-0631
group typical names density (pcf) sieve (%) symbol

35.7 moist. (%)
dry in situ depth (ft.)
B-3 5.0
satur. (%)
75 -200
CL Claystone with Sand (Tm)
boring in situ
78 75
~
--- -

I I I I I I I I I
703
-2.0
-1.0
0 1.0

2.0 3.0

4.0 5.0

6.0 7.0

8.0 0.1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 910
REMARKS: WATER ADDED AT 1.07 TSF

CONSOLIDATION CURVE PERCENT CHANGE IN HEIGHT
PLATE C-3

COMPRESSIVE STRESS IN TSF
Alta California Geotechnical, Inc.

P.N. 1-0631
group typical names density (pcf) sieve (%) symbol

76.8 moist. (%)
dry in situ depth (ft.)
B-4 5.0
satur. (%)
50 -200
CL Claystone (Tm)
boring in situ
87 89
- '
'
' "
-" - '
' ' - -
-
' " '
'
' ' " ' ' ' " ' '
-

I I I I I I I I I
704
-2.0
-1.0
0 1.0

2.0 3.0

4.0 5.0

6.0 7.0

8.0 0.1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 910
REMARKS: WATER ADDED AT 1.07 TSF

CONSOLIDATION CURVE PERCENT CHANGE IN HEIGHT
PLATE C-4

COMPRESSIVE STRESS IN TSF
Alta California Geotechnical, Inc.

P.N. 1-0631
group typical names density (pcf) sieve (%) symbol

34.9 moist. (%)
dry in situ depth (ft.)
B-4 10.0
satur. (%)
77 -200
CL Claystone (Tm)
boring in situ
81 88
' '
'
'
'~
-
--,-

I I I I I I I I I
705
ALTA CALIFORNIA GEOTECHNICAL, INC.

APPENDIX D
Maintenance and Improvement Considerations
706
Project Number 1-0631 Page D-1
September 26, 2025
ALTA CALIFORNIA GEOTECHNICAL, INC.

MAINTENANCE AND IMPROVEMENT CONSIDERATIONS
General
Owners purchasing property must assume a certain degree of responsibility for improvements and for maintaining conditions around their home. Of primary importance from a geotechnical standpoint are maintaining drainage patterns and minimizing the soil moisture variation below all improvements. Such design, construction and owner maintenance provisions may include:
 Employing contractors for improvements who design and build in recognition of local building codes and specific site soils conditions.
 Establishing and maintaining positive drainage away from all foundations, walkways, driveways, patios, and other improvements.
 Avoiding the construction of planters adjacent to structural improvements.

Alternatively, planter sides/bottoms can be sealed with an impermeable membrane and drained away from the improvements via subdrains into approved disposal areas.  Sealing and maintaining construction/control joints within concrete slabs and walkways to reduce the potential for moisture infiltration into the subgrade soils.  Utilizing landscaping schemes with vegetation that requires minimal watering. Watering should be done in a uniform manner, as equally as possible on all sides of the foundation, keeping the soil "moist" but not allowing the soil to become saturated.  Maintaining positive drainage away from structures and providing roof gutters on all structures with downspouts that are designed to carry roof runoff directly into area drains or discharged well away from the foundation areas.  Avoiding the placement of trees closer to the proposed structures than a distance of one-half the mature height of the tree.
 Observation of the soil conditions around the perimeter of the structure during extremely hot/dry or unusually wet weather conditions so that modifications can be made in irrigation programs to maintain relatively uniform moisture conditions.

707
Project Number 1-0631 Page D-2
September 26, 2025
ALTA CALIFORNIA GEOTECHNICAL, INC.

Sulfates
Owners should be cautioned against the import and use of certain inorganic fertilizers, soil amendments, and/or other soils from offsite sources in the absence of specific information relating to their chemical composition. Some fertilizers have been known to leach sulfate compounds into soils and increase the sulfate concentrations to potentially detrimental levels.

Site Drainage
 The owners should be made aware of the potential problems that may develop when drainage is altered through construction of hardscape improvements. Ponded water, drainage over the slope face, leaking irrigation systems, overwatering, or other conditions which could lead to ground saturation must be avoided.  No water should be allowed to flow over the slopes. No alteration of pad gradients should be allowed that would prevent pad and roof runoff from being directed to approved disposal areas.
 Drainage patterns have been established at the time of the fine grading should be maintained throughout the life of the structure. No alterations to these drainage patterns should be made unless designed by qualified professionals in compliance with local code requirements and site-specific soils conditions.

Slope Drainage
 Residents should be made aware of the importance of maintaining and cleaning all interceptor ditches, drainage terraces, down drains, and any other drainage devices, which have been installed to promote slope stability.
 Subsurface drainage pipe outlets may protrude through slope surfaces and/or wall faces. These pipes, in conjunction with the graded features, are essential to slope and wall stability and must be protected in-place. They should not be altered or damaged in any way.

Planting and Irrigation of Slopes
 Seeding and planting of the slopes should be planned to achieve, as rapidly as possible, a well-established and deep-rooted vegetal cover requiring minimal watering.  It is the responsibility of the landscape architect to provide such plants initially and of the residents to maintain such planting. Alteration of such a planting scheme is at the resident's risk.
 The resident is responsible for proper irrigation and for maintenance and repair of properly installed irrigation systems. Leaks should be fixed immediately. 708
Project Number 1-0631 Page D-3
September 26, 2025
ALTA CALIFORNIA GEOTECHNICAL, INC.
 Sprinklers should be adjusted to provide maximum uniform coverage with a minimum of water usage and overlap. Overwatering with consequent wasteful runoff and serious ground saturation must be avoided.
 If automatic sprinkler systems are installed, their use must be adjusted to account for seasonal and natural rainfall conditions.

Burrowing Animals
 Residents must undertake a program to eliminate burrowing animals. This must be an ongoing program in order to promote slope stability.

Owner Improvement
Owner improvements (pools, spas, patio slabs, retaining walls, planters, etc.) should be designed to account for the terrain of the project, as well as expansive soil conditions and chemical characteristics. Design considerations on any given lot may need to include provisions for differential bearing materials, ascending/descending slope conditions, bedrock structure, perched (irrigation) water, special geologic surcharge loading conditions, expansive soil stresses, and long-term creep/settlement.

All owner improvements should be designed and constructed by qualified professionals utilizing appropriate design methodologies, which account for the on-site soils and geologic conditions.

Each lot and proposed improvement should be evaluated on an individual basis.

Setback Zones
Manufactured slopes maybe subject to long-term settlement and creep that can manifest itself in the form of both horizontal and vertical movement. These movements typically are produced as a result of weathering, erosion, gravity forces, and other natural phenomenon. A setback adjacent to slopes is required by most building codes, including the California Building Code. This zone is intended to locate and support the residential structures away from these slopes and onto soils that are not subject to the potential adverse effects of these natural phenomena.

The owner may wish to construct patios, walls, walkways, planters, swimming pools, spas, etc. within this zone. Such facilities may be sensitive to settlement and creep and should not be 709
Project Number 1-0631 Page D-4
September 26, 2025
ALTA CALIFORNIA GEOTECHNICAL, INC.
constructed within the setback zone unless properly engineered. It is suggested that plans for such improvements be designed by a professional engineer who is familiar with grading ordinances and design and construction requirements. In addition, we recommend that the designer and contractor familiarize themselves with the site specific geologic and geotechnical conditions on the specific lot.
710
ALTA CALIFORNIA GEOTECHNICAL, INC.

APPENDIX E
Earthwork Specifications

711
ALTA CALIFORNIA GEOTECHNICAL, INC.

EARTHWORK SPECIFICATIONS
These specifications present the generally accepted standards and minimum earthwork requirements for the development ofthe project. These specifications shall be the project guidelines for earthwork except where specifically superseded in preliminary geology and soils reports, grading plan review reports or by the prevailing grading codes or ordinances of the controlling agency.

A. GENERAL

1. The Contractor shall be responsible for the satisfactory completion of all earthwork in accordance with the project plans and specifications.

2. The project Geotechnical Engineer and Engineering Geologist, or their representatives, shall provide observation and testing services, and Geotechnical consultation forthe duration ofthe project.

3. All clearing, grubbing, stripping and site preparation for the project shall be accomplished by the Contractor to the satisfaction of the Geotechnical Engineer/Engineering Geologist.

4. It is the Contractor's responsibility to prepare the ground surface to receive fill to the satisfaction of the Geotechnical Engineer and to place, spread, mix, moisture condition, and compact the fill in accordance with the job specifications and as required by the Geotechnical Engineer. The Contractor shall also remove all material considered by the Geotechnical Engineer to be unsuitable for use in the construction of engineered fills.

5. The Contractor shall have suitable and sufficient equipment in operation to handle the amount of fill being placed. When necessary, equipment will be shut down temporarily in order to permit the proper preparation of fills.

B. PREPARATION OF FILL AREAS

1. Excessive vegetation and all deleterious material should be disposed of offsite as required by the Geotechnical Engineer.

Existing fill, soil, alluvium or rock materials determined by the Geotechnical Engineer as being unsuitable for placement in compacted fills shall be removed and hauled from the site. Where applicable, the Contractor may obtain the ALTA CALIFORNIA GEOTECHNICAL, INC.
712
Earthwork Specifications
Page2
approval of the Soils Engineer and the controlling authorities for the project to dispose of the above described materials, or a portion thereof, in designated areas onsite.

After removal of the deleterious materials have been accomplished, earth materials deemed unsuitable in their natural, in-place condition, shall be removed as recommended by the Geotechnical Engineer/Engineering Geologist.

2. Upon achieving a suitable bottom for fill placement, the exposed removal bottom shall be disced or bladed by the Contractor to the satisfaction of the Geotechnical Engineer. The prepared ground surfaces shall then be brought to the specified moisture content mixed as required, and compacted and tested as specified. In localities where it is necessary to obtain the approval of the controlling agency prior to placing fill, it will be the Contractor's responsibility to contact the proper authorities to visit the site.

3. Any underground structure such as cesspools, cisterns, mining shafts, tunnels, septic tanks, wells, pipelines or other structures not located prior to grading are to be removed ortreated in a manner prescribed by the Geotechnical Engineer and/or the controlling agency for the project.

C. ENGINEERED FIUS

1. Any material imported or excavated on the property may be utilized as fill, provided the material has been determined to be suitable by the Geotechnical Engineer. Deleterious materials shall be removed from the fill as directed by the Geotechnlcal Engineer.

2. Rock or rock fragments less than twelve inches in the largest dimension may be utilized in the fill, provided they are not placed in concentrated pockets and the distribution of the rocks is approved by the Geotechnical Engineer.

3. Rocks greater than twelve inches in the largest dimension shall be taken offsite, or placed in accordance with the recommendations of the Geotechnical Engineer in areas designated as suitable for rock disposal.

4. All materials to be used as fill, shall be tested in the laboratory by the Geotechnical Engineer. Proposed import materials shall be approved by the Geotechnical Engineer 48 hours prior to importation.

5. The fill materials shall be placed by the Contractor in lifts, that when compacted, shall not exceed six inches. Each lift shall be spread evenly and shall be Al.TA CALIFORNIA GEOTECHNICAL, INC.
713
Earthwork Specifications

Page 3 ends

thoroughly mixed to achieve a near uniform moisture condition and a uniform blend of materials.

All compaction shall be achieved at or above the optimum moisture content, as determined by the applicable laboratory standard. The Contractor will be notified if the fill materials are too wet or too dry to achieve the required compaction standard.

6. When the moisture content of the fill material is below the limit specified by the Geotechnical Engineer, water shall be added and the materials shall be blended until a uniform moisture content, within specified limits, is achieved. When the moisture content of the fill material is above the limits specified by the Geotechnical Engineer, the fill materials shall be aerated by discing, blading, mixed with dryer fill materials, or other satisfactory methods until the moisture content is within the specified limits.

7. Each fill lift shall be compacted to the minimum project standards, in compliance with the testing methods specified by the controlling governmental agency, and in accordance with recommendations of the Geotechnical Engineer.

In the absence of specific recommendations by the Geotechnical Engineer to the contrary, the compaction standard shall be the most recent version of ASTM :D 1557.

8. Where a slope receiving fill exceeds a ratio of five-horizontal to one-vertical, the fill shall be keyed and benched through all unsuitable materials into sound bedrock or firm material, in accordance with the recommendations and approval of the Geotechnical Engineer.

9. Side hill fills shall have a minimum key width of 15 feet into bedrock or firm materials, unless otherwise specified in the soil report and approved by the Geotechnical Engineer in the field.

10. Drainage terraces and subdrainage devices shall be constructed in compliance with the ordinances of the controlling governmental agency and/or with the recommendations ofthe Geotechnical Engineer and Engineering Geologist.

11. The Contractor shall be required to maintain the specified minimum relative compaction out to the finish slope face of fill slopes, buttresses, and stabilization fills as directed by the Geotechnical Engineer and/or the governing agency for the project. This may be achieved by either overbuilding the slope and cutting Al.TA CALIFORNIA GEOTECHNICAL, INC.
714
Earthwork Specifications
Page4
back to the compacted core; by direct compaction of the slope face with suitable equipment; or by any other procedure which produces the required result.

12. The fill portion of fill-over-cut slopes shall be properly keyed into rock or firm material; and the fill area shall be stripped of all soil or unsuitable materials prior to placing fill.

The design cut portion of the slope should be made first and evaluated for suitability by the Engineering Geologist prior to placement of fill in the keyway above the cut slope.

13. Pad areas in cut or natural ground shall be approved by the Geotechnical Engineer. Finished surfaces of these pads may require scarification and recompaction, or over excavation as determined by the Geotechnical Engineer.

D. CUT SLOPES

1. The Engineering Geologist shall observe all cut slopes and shall be notified by the Contractor when cut slopes are to be started.

2. If, during the course of grading, unforeseen adverse or potentially adverse geologic conditions are encountered, the Engineering Geologist and Soil Engineer shall investigate, analyze and make recommendations to remediate these problems.

3. Non-erodible interceptor swales shall be placed at the top of cut slopes that face the same direction as the superjacent, prevailing drainage.

4. Unless otherwise specified in specific geotechnical reports, no cut slopes shall be excavated higher or steeper than that allowed by the ordinances of controlling governmental agencies.

5. Drainage terraces shall be constructed in compliance with the ordinances of the controlling governmental agencies, and/or in accordance with the recommendations of the Geotechnical Engineer or Engineering Geologist.

E. GRADING CONTROL

1. Fill placement shall be observed and tested by the Geotechnical Engineer and/or his representative during grading.

Field density tests shall be made by the Geotechnical Engineer and/or his representative to evaluate the compaction and moisture compliance of each fill lift. Density tests shall be conducted at intervals not to exceed two feet of fill ALTA CALIFORNIA GEOTECHNICAL, INC.
715
Earthwork Specifications
Pages
height. Where sheepsfoot rollers are used, the fill may be disturbed to a depth of several inches. Density determinations shall be taken in the compacted material below the disturbed surface at a depth determined by the Geotechnical Engineer or his representative.

2. Where tests indicate that the density of any layer of fill, or portion thereof, is below the required relative compaction, or improper moisture content is in evidence, that particular layer or portion thereof shall be reworked until the required density and/or moisture content has been attained. Additional fills shall not be placed over an area until the previous lift of fill has been tested and found to meet the density and moisture requirements for the project and the previous lift is approved by the Geotechnical Engineer.

3. When grading activities are interrupted by heavy rains, fill operations shall not be resumed until field observations and tests by the Geotechnical Engineer indicate the moisture content and density of the fill are within the specified limits.

4. During construction, the Contractor shall properly grade all surfaces to maintain good drainage and prevent the ponding of water. The Contractor shall take remedial action to control surface water and to prevent erosion of graded areas until such time as a permanent drainage and erosion devices have been installed.

5. Observation and testing by the Geotechnical Engineer and/or his representative shall be conducted during filling and compacting operations in order that he will be able to state in his opinion that all cut and filled areas are graded in accordance with the approved specifications.

6. Upon the completion of grading activities and after the Geotechnical Engineer and Engineering Geologist have finished their observations of the work, final reports shall be submitted. No further excavation or fill placement shall be undertaken without prior notification of the Geotechnical Engineer and/or Engineering Geologist.

F. FINISHED SLOPES
All finished cut and fill slopes shall be planted and irrigated and/or protected from erosion in accordance with the project specifications, governing agencies, and/or as recommended by a landscape architect.

ALTA CALIFORNIA GEOlECHNJCAL, INC.
716
ALTA CALIFORNIA GEOTECHNICAL, INC.

APPENDIX F
Grading Details
717

DETAIL FOR FILL SLOPE TOEING OUT ON FLAT ALLUVIATED CANYON

PRE-EXISTING SURFACE TO BE

RESTORED WITH COMPACTED FILL
. , .
•'
. .
. ·-~- ALLUVIUM ... "
• • ·., .- ·rb'".-REMA1N: • · . • x.
' • • . '_ ,IN' .PLACE ·. - - •. . ' ,. _ _.'-
• ' ·--~--:··. ,
·.- ~

TOE OF SLOPE AS SHOWN

ON GRADING PLAN
~ 7"'\Q.: 7'"'\Q.: 7'<2: 7'~ 7'~ 7'q__: :T'\<?.;: /\~ 7'<2: :T'\<Z: 7'<2: 7'~ 7'<Z: 7'~

PROPOSED FILL SLOPE

EXISTING TOPOGRAPHY

ANTICIPATED ALLUVIAL REMOVAL

DEPTH PER GEOTECHNICAL ENGINEER
FORECUT VARIES; FOR DEEP REMOVALS, /
FORECUT SHOULD BE MADE NO STEEPER APPiovED PROVIDE A 1 :1 MIN. PROJECTION FROM TOE OF SLOPE AS THAN 1 :1, OR AS REQUIRED FOR SAFETY COMPETENT SHOWN ON GRADING PLAN TO THE RECOMMENDED REMOVAL CONSIDERATIONS MATERIAL BOTTOM. SLOPE HEIGHT, SITE CONDITIONS, AND/OR LOCAL

CONDITIONS COULD DICTA TE FLATTER PROJECTIONS
~ h. ALTA CALIFORNIA GEOTECHNICAL, INC . /L'\.._,-'\. VER. 3/12 PA TH, C1\Users\Jlnks\Desktop\Dro. ftlng\GRADING DETAILS\G-1.dwg PLATE G-1
718

REMOVAL ADJACENT TO EXISTING FILL

PROPOSED FINISH GRADE
_ _\__ --- -- - -

INTERIM GRADE
afe
•TIE-IN

BACKCUT
(EXISITING ENGINEERED

FILL TO REMAIN IN PLACE)
*INITIATE 1 :1 TIE-IN BACKCUT TO

PROPOSED ADDITIONAL

ENGINEERED FILL
:f:EMPORARY.ENGINEERED FILL
· ••.. ••. At:LUV-11.JM
lt~•l:liREMbVE:C)AND REPLACED
.·•• :~cw:~liiit··.·••·· ·••.· ··•. :\VITt{EN~IN'EBfllio FILL)

APPROVED

COMPETENT

MATERIAL

INTERCEPT TOE OF INTERIM BACKCUT
** AS PART OF TIE-IN FOR ADDITIONAL

ENGINEERED FILL
.~ ALTA CALIFORNIA GEOTECHNICAL, INC. ;'-'\_,_'. VER. 3/12 PATH,C•\Users\Jlnks\Desktop\Drnftlng\GRADING DETAILS\G-2.dwg PLATE G-2
719

CANYON SUBDRAIN

PRE-EXISTING

TOPOGRAPHY

APPROVED

REMOVAL
BOTTOM

APPROVED COMPETENT

MATERIAL
SEE DETAIL (PLATE G-4)
.~ ALTA CALIFORNIA GEOTECHNICAL, INC. _/L'\_'_" VER. 3/12 PATH:C:\User11\Jlnks\Desklop\Oraftlng\GRADING DETAILS\G-3.dwg PLATE G-3
720

CANYON SUBDRAIN DETAIL
FILTER
FABRIC
6" MIN.
6" MIN. OVERLAP
/

PERFORATED PIPE SURROUNDED WITH ROCK AND FILTER FABRIC
ROCK: MIN. VOLUME OF 9 CU.FT. PER LINEAR FT. OF 3/4 IN. MAX. ROCK PIPE: 6 IN. ABS OR PVC PIPE WITH A MINIMUM OF 8 PERFORATIONS (1/4-IN. DIA.) PER LINEAL FT. IN BOTTOM HALF OF PIPE
ASTM D2751, SOR 35, OR ASTM D3034 OR ASTM D1527,
SCHD. 40 ASTM D1785, SCHD. 40
FILTER FABRIC: MIRAFI 140 FILTER FABRIC OR APPROVED EQUIVALENT NOTES:

1. FOR CONTINUOUS RUN IN EXCESS OF 500. FT USE 8 IN. DIA. PIPE

2. ENGINEERED FILL PLACED BELOW DRAINS SHALL BE COMPACTED TO 93% OF THE LABORATORY MAXIMUM DRY DENSITY (ASTM:D1557) .~ ALTA CALIFORNIA GEOTECHNICAL, INC . /L\__'_'\ VER. 3/12 PATH:C:\Users\Jlnks\Desktop\Draftlng\GRADING DETAILS\G-4.dwg PLATE G-4
721
5' MIN.

OVEREXCAVATION CUT LOT

OVEREXCAVATE AND REPLACE

WITH ENGINEERED FILL

APPROVED COMPETENT MATERIAL

CUT -FILL LOT (TRANSITION)

EXISTING

TOPOGRAPHY

EXISTING

TOPOGRAPHY
MIN.
t
• MIN.
t

OVEREXCAVATE AND RECOMPACT

APPROVED COMPETENT MATERIAL

UNSUITABLE MATERIAL TO BE

REMOVED AND REPLACED WITH

ENGINEERED FILL
•NOTE ALL BUILDING PADS SHALL BE OVER EXCAVATED TO A
MINIMUM OF½ OF THE MAXIMUM DEPTH OF FILL BELOW THE
BUILDING PAD TO A MAXIMUM OF 17 FEET (SEE PLATE G-16)
•~ ALTA CALIFORNIA GEOTECHNICAL, INC. jL"\_'_"\ VER. 3/12 PATH1 C1\Users\Jlnks\Desktop\Dro.f'tlng\GRADING DETAILS\G-5,dwg PLATE G-5
722

SIDE HILL SLOPE FILL DETAIL
(NATURAL SLOPES 5:1 OR STEEPER)

TOE OF SLOPE ON
PROVIDE A 1 :1 MINIMUM GRADING PLAN

PROJECTION FROM DESIGN

TOE OF SLOPE TO TOE OF KEY

NATURAL SLOPE TO

BE RESTORED WITH

COMPACTED FILL
.

PROPOSED
GRADE

FORECUT
VARIES
, 3' MIN.
lf::T'"
2' MIN.

INTO APPROVED

COMPETENT

MATERIAL
l--15• MIN.~r,, NOTES:

MIN. KEY DIMENSION 15'X2'X3' FOR
SLOPE HEIGHTS LESS THAN 30 FT.

SLOPES GREATER THAN 30 FT., KEY
WIDTH IS SLOPE HEIGHT DIVIDED BY 2.
• ALTA CALIFORNIA GEOTECHNICAL, INC . /L\-'~\, VER. 1/18 PATH,C•\User-s\Jlnks\Desktop\Dr-nftlng\GRADING DETAILS\G-6,dwg

EXISTING

TOPOGRAPHY
--j

WIDTH VARIES
~MPACTED FILL
/
MAINTAIN MIN. 15' HORIZ. WIDTH

FROM FACE OF SLOPE TO BENCH/BACKCUT
T

1. WHERE NATURAL SLOPE GRADIENT IS 5:1 OR LESS, SEE PLATE G-1. WHERE THE NATURAL SLOPE APPROACHES OR EXCEEDS

THE DESIGN SLOPE RATIO, SPECIAL RECOMMENDATIONS WILL
BE PROVIDED BY THE GEOTECHNICAL ENGINEER.

2. THE NEED FOR AND PLACEMENT OF DRAINS WILL BE

DETERMINED BY THE GEOTECHNICAL ENGINEER OR
GEOLOGIST BASED UPON EXPOSED FIELD CONDITIONS .

PLATE G-6
723
*DESIGN CUT SLOPE
. ···,·
.·- ..

0. /

APPROVED COMPETENT

MATERIAL

FILL OVER CUT SLOPE DETAIL

SHORT-TOP

FILL SLOPE

PROPOSED

EXISTING

TOPOGRAPHY
CATCH
POINT
GRADE
--I

WIDTH MAY VARY
15' MIN.

MIN. KEY DIMENSION 15'X2'X3' FOR
SLOPE HEIGHTS LESS THAN 30 FT. SLOPES GREATER THAN 30 FT., KEY WIDTH IS SLOPE HEIGHT DIVIDED BY 2

NEED AND LOCATION OF HEEL DRAIN TO BE

DETERMINED BASED UPON FIELD CONDITIONS,
SEE DETAIL PLATE G-8
•THE CUT PORTION OF THE SLOPE SHOULD BE EXCAVATED AND

EVALUATED BY THE ENGINEERING GEOLOGIST/GEOTECHNICAL

ENGINEER PRIOR TO CONSTRUCTING THE FILL SLOPE
.~ ALTA CALIFORNIA GEOTECHNICAL, INC. ;L'\_'_"\ VER. 1/18 PLATE G-7 PATH,C•\Users\Jlnks\Desktop\Droftlng\GRADING DETAILS\G-7 (Toa 10-6-17),dwg 724

STABILIZATION/BUTTRESS FILL BACKDRAIN
NOTE:

1. ASTM 02751, SOR 35, OR ASTM 03034 OR
ASTM 01527, SCHD. 40ASTM 01785, SCHD. 40

2. SOLID PIPE OUTLETS TO BE PROVIDED EVERY 100 FT.

AND JOINED TO PERFORATED BACKDRAIN PIPE WITH
"L" OR 'T's. MIN. 2% GRADIENT.

FILTER FABRIC
MIN. 6" OVERLAP
ALTERNATIVE NO. 2
2' MIN.
--+!-·•~··~~-"~-•_o~-;,-·. -~----- --~-
PIPE
4" MIN.
.. Ci .'

FINISHED GRADE
2" MIN.

TOE
ALTERNATIVE NO. 1
PIPE
4" MIN.

HEEL
2' MIN.
0 2" MIN.
z

3. GRAVEL TRENCH TO BE FILLED WITH 3/4 IN. MAXIMUM
ROCK

4. THE NECESSITY FOR UPPER TIER BACKDRAINS SHALL BE

DETERMINED IN THE FIELD BY THE GEOTECHNICAL ENGINEER
OR GEOLOGIST. UPPER TIER OUTLETS SHOULD DRAIN INTO
PAVED TERRACE DRAINS.

5. ENGINEERED FILL PLACED BELOW DRAINS SHALL BE COMPACTED TO 93% OF THE LABORATORY MAXIMUM DRY DENSITY (ASTM:01557) TYPICAL 2 FT. X 2 FT. 3/4 IN. MAX. ROCK FILLED TRENCH WITH 4 IN. DIA. ABS OR PVC PIPE OR APPROVED SUBSTITUTE. PROVIDE MINIMUM 8 PERFORATIONS (1/4-IN. DIA.) PER LINEAL FOOT IN BOTTOM HALF OF PIPE. PIPE IS TO EXTEND FULL LENGTH OF BUTTRESS OR STABILIZATION FILL WITH A MINIMUM GRADIENT OF 2% TO OUTLET PIPES.

I .. 15' MIN;. I

OVEREXCAVATION - AS REQUIERD
~-- BY GEOTECHNICAL ENGINEER OR
GEOLOGIST (3' MIN)
~i----- BACKCUT BENCHED AT CONTACT
4" NON- PERFORATED PIPE TO BE PLACED

AT LOTS LINES OR AS DESIGNATED BY THE

GEOTECHNICAL ENGINEER OR GEOLOGIST
2' MIN. KEY DEPTHJ-~--
15' MIN. KEY WIDTH 3' MIN. KEY DEPTH
.~ ALTA CALIFORNIA GEOTECHNICAL, INC. ~"\_'_'\ VER. 3/12 PATH,C•\Users\Jlnks\Desktop\DrQftlng\GRADING DETAILS\G-8,dwg PLATE G-8
725

EXISTING

TOPOGRAPHY
.h ALTA CALIFORNIA GEOTECHNICAL, INC . ;L'\_'_"\ VER. 1/18

STABILIZATION FILL
(UPSLOPE ALLUVIATED AREA)

CONSTRUCT STABILIZATION FILL
(MINIMUM KEY 15'x2'x3')

PROPOSED
GRADE
T
BENCH

BACK DRAIN
PER DETAIL G-8
* FOR SLOPE HEIGHTS LESS THAN 30 FT.

SLOPES GREATER THAN 30 FT., KEY
WIDTH IS SLOPE HEIGHT DIVIDED BY 2

PROVIDE BERM, PAVED SWALE,

AND/OR STORM DRAIN PER

CIVIL ENGINEER

UPPER DRAIN AT

ALLUVIUM/BEDROCK
CONTACT. PROVIDE OUTLETS BASED UPON

RECOMMENDATIONS OF

GEOTECHNICAL ENGINEER

OR GEOLOGIST
PLATE G-9
726

SELECTIVE GRADING DETAIL FOR STABILIZATION FILL

UNSTABLE MATERIAL EXPOSED IN PORTION OF CUT SLOPE

EXISTING

TOPOGRAPHY

COMPACTED FILL

THE NEED FOR AND DEPTH OF

OVEREXCAVATION TO BE DETERMINED

BY THE GEOTECHNICAL

ENGINEER/GEOLOGIST

APPROVED COMPETENT

MATERIAL

IF RECOMMENDED BY THE GEOTECHNICAL ENGINEER/GEOLOGIST

THE REMAINING CUT PORTION OF THE SLOPE MAY REQUIRE

REMOVAL AND REPLACEMENT WITH A KEYWAY (W') AND COMPACTED FILL (SEE PLATE G-8)
NOTES: 1. BACKDRAINS ARE NOT REQUIRED UNLESS SPECIFIED.

2. "W" SHALL BE EQUIPMENT WIDTH (15') FOR SLOPE HEIGHT LESS THAN 25 FEET. FOR SLOPES GREATER THAN 25 FEET, "W" SHALL BE DETERMINED BY THE PROJECT GEOTECHNICAL ENGINEER/GEOLOGIST.

AT NO TIME SHALL "W" BE LESS THAN H/2.
-~ ALTA CALIFORNIA GEOTECHNICAL, INC. ~°\_'_'\, VER. 3/12 PATH,C•\Users\Jlnks\Desktop\Droftlng\GRADING DETAILS\G-10,dwg PLATE G-10
727

SKIN FILL SLOPE OVER NATURAL GROUND
- T --· 2'MIN.

ENGINEERED FILL t
/
/
/

PROPOSED
GRADE
/4
• 0 3' MIN.
t
1--- 15' MIN. -----1

EXISTING

TOPOGRAPHY
15' MIN. TO BE MAINTAINED

FROM SLOPE FACE TO BACKCUT

NEED AND LOCATION OF HEEL DRAINS TO BE
...___ DETERMINED BASED UPON FIELD CONDITIONS
MIN. KEY DIMENSIONS 15'X2'X3' FOR IF REQUIRED, SEE DETAIL PLATE G-8 SLOPE HEIGHTS LESS THAN 30 FT. SLOPES GREATER THAN 30 FT., KEY WIDTH IS SLOPE HEIGHT DIVIDED BY 2
.~ ALTA CALIFORNIA GEOTECHNICAL, INC. /L\.._'_ \, VER. 1/18 PLATE G-11 PATH,C•\Users\Jlnks\Desktop\Draftlng\GRADING DETAILS\G-11.dwg 728

DETAIL FOR MAXIMUM PARTICLE DIMENSION

PROPOSED
G\ADE
ZONE
1 - - 1
3 ~-" _'::,,__ FILL SLOPE SURFACE
7 ............ __ ,5.~ / ZONE 2 7 FT "-.........._ '--...... ------~------'~ ...... , ...... -..............

ZONE 3 >10 FT ',....._ ZONE 4 ...............

I ',,
PARTICLE MAX.

ZONE DEPTH DIMENSION
1 0-3ft. ~1.0 ft.
2 3-10 ft. ~2.0 ft.
3 >10 ft. ~8.0 ft.
15 HORIZONTAL FEET 4 FROM Fill SLOPE FACE ~1.0 ft.
-~ ALTA CALIFORNIA Gl!DTl!!CHNICAL, INC. ;L"' '-. VER. 2/15 ...... ' '

PLACEMENT METHOD

STANDARD OR CONVENTIONAL

COMPACTION METHODS
(SEE EARTHWORK SPECIFICATIONS)

ROCK BLANKETS
(SEE PLATE G-13)
ROCK BLANKETS (PLATE G-13)
ROCK WINDROW (PLATE G-14)
INDIVIDUAL ROCK BURIED (PLATE G-15)

STANDARD OR CONVENTIONAL

COMPACTION METHODS
(SEE EARTHWoRK SPECIFICATIONS)
PLATE G-12
PATH C1\Users\scott\Dropbox CAl to. CA Geotechnlc:aO\Atto. Server'\ To Jlnks\.Dro. ftlng\GRADlNG DET A!LS\G-12,dwg 729

ROCK BLANKET DETAILS
LOOSE PILE 1

LOOSE, DUMPED ROCK, GRAVEL ANO SAND MIXTURE REMOVE
FRAGMENTS LARGER THAT 2 FEET FOR ISOLATED BURIAL
(PLATE G-15) OR WINDROW (PLATE G-10)
COMPACT PILE 1
SPREAD LOOSE PILE FORWARD W!TH HEAVY TRACKED DOZER (D-8 OR LARGER). HEAVILY WATER, TRACK, AND APPLY ADDITIONAL SAND

ANO GRAVEL AS NECESSARY TO FILL VOIDS AND CREATE A DENSE MATRIX OF ROCK, COBBLES, GRAVEL AND SAND (2 FOOT MAXIMUM

THICKNESS)
APPROVED BOTTOM, OR TOP Of='.

PAEVIOUSL Y APPROVED BLANKET
Fill

COMPACTED
PILES 1 AND 2

APPROVED BOTTOM, OR TOP OF

PREVIOUSLY APPROVED BLANKET
FILL

APPROVED BOTTOM, OR TOP OF

PREVIOUSLY APPROVED BLANKET
FILL
LOOSE PILE 2

DUMP SUCCESSIVE PILES OF LOOSE ROCK, GRAVEL AND SAND

MIXTURE ON FORWARD EDGE OF PREVIOUSLY COMPACTED LIFT
WITH TRUCKS AND/OR SCRAPERS. USE PREVIOUS LIFT TO ACCESS AND FURTHER COMPACT P1LE 1.

LOOSE PILE 3

DUMP SUCCESSIVE PILES OF LOOSE ROCK, GRAVEL AND SAND

MIXTURE ON FORWARD EDGE OF PREVIOUSLY COMPACTED LIFT
WITH TRUCKS AND/OR SCRAPERS. USE PREVIOUS LIFT TO ACCESS AND FURTHER COMPACT EXISTlNG BLANKET.

OBSERVATION TESTING AND APPROVAL PROCEDURES
OBSERVE EQUIPMENT. SCRAPERS AND TRUCKS SHOULD BE FULLY SUPPORTED ON BLANKET WITHOUT SIGNIFICANT YIELDING.

EXCAVATE TEST/OBSERVATION PITS TO CONFIRM EXISTENCE OF MIXTURE OF VARIOUS PARTICLE SIZES, WITHOUl SIGNIFICANT VOIDS, AND FOAMING A DENSE, COMPACTED FILL MATRIX. TEST BY ASTM D1556, D2922 AND/OR D3017 WHEN APPROPRIATE, RECORD LIMITS AND ELEVATION OF BLANKET. ALL FILL AND COMPACTION OPERATIONS TO BE CONDUCTED UNDER THE OBSERVATION OF THE GEOTECHNICAL ENGINEER. SUBSEQUENT UFTS TO BE APPLIED ONLY AFTER OBSERVATION AND CONFIRMATION OF SUITABILITY OF FILL ANO RELEASE BY THE GEOTECHNICAL ENGINEER. BLANKETS TO BE CONSTRUCTED IN ACCORDANCE WITH PLATE G-12 .
• ~ ALTACALIFORNIAGEOTECHNICAL, INC. /L'\_'_'\ VER. 3/12 PATH:C:\ UHrw\Jlnks\O.sktop\0raflfng\GRADING DETAILS\G-13.dwg PLATE G-13
730

PROPOSED ROCK WINDROW DETAIL
GR,:_
"" 1 O' *
------------.--"-~__l__
SEE PLATE G-12 PROPOSED SLOPE SURFACE
--....

C> '---.... "- --.... --....

D ~----, 15'---" I-- 1 5' --I ~ --.._ '---.._
WINDROW '-....__
(TYPICAL) '-'
=
t=
a
NOTE: OVERSIZED MATERIAL SHOULD BE REMOVED FROM THE 15'

CLEAR ZONES WITH SPECIAL EQUIPMENT, SUCH AS A
ROCK RAKE, PRIOR TO PLACING THE NEXT FILL LIFT.
*VARIANCES TO THE ABOVE ROCK HOLD DOWN MAY BE GRANTED

SUBJECT TO APPROVAL BY THE OWNER, GEOTECHNICAL ENGINEER,

AND GOVERNING AGENCY

TYPICAL WINDROW DETAIL (END VIEW)

HORIZONTALLY PLACED

COMPACTED FILL

GRANULAR SOIL FLOODED

TO FILL VOIDS
NOTE: COMPACTED FILL SHALL BE BROUGHT UP TO A HIGHER ELEVATION ALONG EACH WINDROW SO GRANULAR SOIL CAN BE FLOODED IN A "TRENCH CONDITION".

PROFILE VIEW
-~ ALTACALIFORNIAGEOTECHNICAL, INC. ~'\_'_"\ VER. 3/12
PATH1C1\Users\Jlnks\Desktop\Dro.ftlng\GRADING DETAILS\G-14,dwg PLATE G-14
731

ISOLATED ROCK BURIAL DETAILS
"•' ··,.,, . .,.- .
. ;;-~ i:;;;.

EXCAVATE HOLE INTO EXISTING FILL PRISM, PLACE BOULDER(< 8 feet in maximum dimension) INTO EXISTING COMPACTED FILL. SURROUND WITH SAND, GRAVEL, COBBLES AND WATER HEAVILY. TRACK WITH DB OR LARGER EQUIPMENT UNTIL RESULTING FILL FULLY SUPPORTS EQUIPMENT. OBSERVE AND/OR TEST IN ACCORDANCE WITH ASTM D1556, D2922 OR D3017. ROCKS LARGER THAN 8 FEET SHALL BE FURTHER REDUCED IN SIZE BY SECONDARY BREAKING . . ~ ALTA CALIFORNIA GEOTECHNICAL, INC. /L"\-,-, VER. 3/12 PATH:C:\ erw\Jlnka\Deaklop\Drafflng\GRADING DETAILS\ G-15.dwg PLATE G-15
732
RELATIVE COMPACTION VS. DEPTH

CANYON WALL LAY BACK

DIFFERENTIAL FILL OVEREXCAVATION DETAILS

PROPOSED
GRADE
_ _/
t
50'=90%

BUILDING PAD,---
2:1 LAYBACK OF
CANYON WALL®

EXISTING

TOPOGRAPHY
t
'APPROVED COMPETENT
.~ ALTA CALIFORNIA GEOTECHNICAL, INC. ;'-"\_'_'\ VER. 3/12 PATH1C1\User-s\Jlnks\Desktop\Dro.f'tlng\GRADING DETAILS\G-16,dwg

MATERIAL

1. ALL FILL PLACED BELOW 50 FEET OF FINISHED GRADE SHALL BE COMPACTED TO A MINIMUM OF 93% RELATIVE COMPACTION .
.

2. CANYON WALLS WITHIN 50 FEET OF FINISHED GRADE SHALL BE LAID BACK TO A SLOPE RATIO OF 2:1 OR FLATTER.

3. ALL BUILDING PADS SHALL BE OVER EXCAVATED TO A MINIMUM OF 1 /3 OF THE MAXIMUM DEPTH OF FILL BELOW THE BUILDING PAD TO A MAXIMUM OF 17 FEET.

4. IF THE 2:1 LAY BACK OF THE CANYON WALL IS IMPRACTICAL, THEN AS AN ALTERNATIVE THE INCREASED COMPACTION STANDARDS IN NOTE 1 SHOULD BE EXTENDED UP TO H/3 AND THE LAY BACK WILL NOT BE REQUIRED. PLATE G-16
733
5'
t

SETTLEMENT PLATE DETAIL
2'X2' X 1/4" STEEL PLATE
STANDARD 3/4" PIPE NIPPLE, WELDED
TOP AND UNDERSIDE OF PLATE.
3/4" DIA. X 5' LONG GALVANIZED PIPE,
flllF-----t---STANDARD PIPE THREADS TOP AND

CAP AND COVER
PER PLATE G-12A
5' 5'
BOTTOM. EXTENSIONS THREADED BOTH
ENDS AND ADDED IN 5' INCREMENTS.
3" DIA. SCHEDULE 40 PVC, ADD IN 5'
INCREMENTS, GLUE JOINTS.

MAINTAIN 5' HORIZONTAL CLEARANCE FOR HEAVY
EQUIPMENT. HAND COMPACT IN 2' VERTICAL

INCREMENTS OR ALTERNATIVE SUITABLE TO
AND ACCEPTED BY THE GEOTECHNICAL ENGINEER.

HAND COMPACT INITIAL 5' (VERTICAL)
WITHIN 10' HORIZONTAL

PLACE AND HAND COMPACT INITIAL
2' OF FILL PRIOR TO ESTABLISHING 2
•
5 '=:::.LX,'•--·',i~~ilti·?i/a:;~;;;:·1=;'j~--~=iii-;:...~~,.........::,,.__ INITIAL READING 'REMOVAL BOTTOM
PROVIDE 1-INCH OF SAND/GRAVEL BEDDING MINIMUM
NOTES:
1) LOCATIONS OF SETTLEMENT PLATES SHALL BE CLEARLY MARKED AND READILY VISIBLE (RED FLAGGED) TO EQUIPMENT OPERATORS.
2) CONTRACTOR SHALL MAINTAIN 10' HORIZONTAL CLEARANCE FOR HEAVY EQUIPMENT WITHIN 5' (VERTICAL) OF PLATE BASE. FILL WITHIN CLEARANCE AREA SHALL BE HAND

COMPACTED TO PROJECT SPECIFICATIONS OR COMPACTED BY ALTERNATIVE APPROVED BY THE GEOTECHNICAL ENGINEER.
3) AFTER 5' (VERTICAL) OF FILL IS IN PLACE, CONTRACTOR SHALL MAINTAIN 5' HORIZONTAL EQUIPMENT CLEARANCE. FILL IN CLEARANCE AREA SHALL BE HAND COMPACTED (OR APPROVED ALTERNATIVE) IN VERTICAL INCREMENTS NOT TO EXCEED 2 FEET. 4) IN THE EVENT OF DAMAGE TO SETTLEMENT PLATE OR EXTENSION RESULTING FROM

EQUIPMENT OPERATING WITHIN PRESCRIBED CLEARANCE AREA, CONTRACTOR SHALL

IMMEDIATELY NOTIFY GEOTECHNICAL ENGINEER AND SHALL BE RESPONSIBLE FOR RESTORING THE SETTLEMENT PLATE AND EXTENSION RODS TO WORKING ORDER . • ~ ALTA CALIFORNIA GEOTECHNICAL, INC . ,IL'\_'_'\ VER. 3/12 PLATE G-17 PATH1C1\Users\Jlnks\Desktop\Drnf'tlng\GRADING DETAILS\G-17,dwg 734

SURFACE SETTLEMENT MONUMENT DETAIL
=I I 1==111
CONCRETE OR PLASTIC = I I

SPRINKLER VAULT

PVC CAP
~-11111
... 3'8" LONG #8 REBAR OR_-~'f:!::l:J,-a--, ---:.-
3/4" GALVANIZED PIPE
4" SCH. 40 PVC PIPE
' . . .
. \·
.. .
==11 ••. ' •
L I i1il::
.~ ALTACALIFORNIAGEOTECHNICAL, INC.
~\__'_'\. VER. 3/12
PATH1C1\Users\Jlnks\Desktop\Draftlng\GRADING DETAILS\G-18,clwg 6'
2'
- -I
I
I
--lr..,..,..J.-,-,-,-_-,J-,.1
-111==11

CONCRETE OR SLURRY
. : 3 FEET MIN.

APPROX. 6" EMBEDMENT

INTO COMPACTED FILL
PLATE G-18
735
0 1.0' MIN BELOW

LOWEST UTILITY
.~ ALTA CALIFORNIA GEOTECHNICAL, INC , /L"\,__'_'\, VER. 3/13 VARIES
VARIES

PER PLAN
PATH,C•\Users\Jlnks\Desktop\Drnftlng\GRADING DETAILS\G-19,dwg R/W

LOT LENGTH (VARIES)
~w
en z
Cl ::J
-o z " g <( 5 CD PAD ELEVATION AS SHOWN ON PLAN
SLO\RIES~----LCD-------=:i:m~~--
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E.1 - Phase I Environmental Site Assessment
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Aliso Viejo City CouncilOctober 7, 2026

Aliso Viejo City Council
October 7, 2026