Yorba Linda City Council
February 3, 2026

Key Steps to Follow:

Step 1: Correctly identify the pest (insect,
weed, rodent, or disease) and verify that it is
actually causing the problem.

This is important
because beneficial
insects are often
mistaken for pests
and sprayed with
pesticides needlessly.

Consult with a
Certified Nursery
Professional at a local nursery or garden center
or send a sample of the pest to the Orange
County Agricultural Commissioner’s Office.

Determine if the pest is still present – even
though you see damage, the pest may have left.

Step 2: Determine
how many pests are
present and causing
damage.

Small pest populations
may be controlled
more safely using nonpesticide techniques. These include removing food sources, washing off leaves with a strong
stream of water, blocking entry into the home
using caulking and replacing problem plants
with ones less susceptible to pests.

Step 3: If a pesticide must be used, choose
the least toxic chemical.

Obtain information on the least toxic pesticides
that are effective at controlling the target
pest from the UC Statewide Integrated Pest
Management (IPM) Program’s Web site at
www.ipm.ucdavis.edu.

Seek out the assistance of a Certified Nursery
Professional at a local nursery or garden center
when selecting a pesticide. Purchase the
smallest amount of pesticide available.

Apply the pesticide to the pest during its most
vulnerable life stage. This information can be
found on the pesticide label.

Step 4: Wear appropriate protective clothing.

Follow pesticide labels regarding specific types
of protective equipment you should wear.

Protective clothing should always be washed
separately from other clothing.

Step 5: Continuously monitor external
conditions when applying pesticides such as
weather, irrigation, and the presence of children
and animals.

Never apply pesticides when rain is predicted
within the next 48 hours. Also, do not water
after applying pesticides unless the directions say
it is necessary.

Apply pesticides when the air is still; breezy
conditions may cause the spray or dust to drift
away from your targeted area.

In case of an emergency call 911 and/or the
regional poison control number at
(714) 634-5988 or (800) 544-4404 (CA only).

For general questions you may also visit
www.calpoison.org.

Step 6: In the event of accidental spills,
sweep up or use an absorbent agent to remove
any excess pesticides. Avoid the use of water.

Be prepared. Have a broom, dust pan, or dry
absorbent material, such as cat litter, newspapers
or paper towels, ready to assist in cleaning up
spills.

Contain and clean up the spill right away. Place
contaminated materials in a doubled plastic bag.

All materials used to clean up the spill should
be properly disposed of according to your local
Household Hazardous Waste Disposal site.

Step 7: Properly store and dispose of unused
pesticides.

Purchase Ready-ToUse (RTU) products
to avoid storing
large concentrated
quantities of
pesticides.

Store unused chemicals in a locked cabinet.

Unused pesticide chemicals may be disposed
of at a Household Hazardous Waste Collection
Center.

Empty pesticide containers should be triple
rinsed prior to disposing of them in the trash.

Household Hazardous Waste
Collection Center
(714) 834-6752
www.oclandfills.com
Integrated Pest Management (IPM)
usually combines several least toxic pest
control methods for long-term prevention
and management of pest problems
without harming you, your family,
or the environment.

Three life stages of the common lady
beetle, a beneficial insect.

Tips for Pest Control

Sewage Spill
Regulatory Requirements
This brochure was designed courtesy of the Orange County Sanitation District (OCSD).

For additional information, call (714) 962-2411, or visit their website at www.ocsd.com Your Responsibilities
as a Private Property Owner
Reference Guide
Sewage Spill
Allowing sewage to discharge to a gutter or storm
drain may subject you to penalties and/or out-ofpocket costs to reimburse cities or public agencies for clean-up efforts.

Here are the pertinent codes, fines, and agency
contact information that apply.

Orange County Stormwater Program
24 Hour Water Pollution Reporting Hotline
1-877-89-SPILL (1-877-897-7455)
! County and city water quality ordinances prohibit discharges containing pollutants.

California Health and Safety Code, Sections 5410-5416
! No person shall discharge raw or treated sewage or other waste in a manner that results in contamination, pollution or a nuisance. ! Any person who causes or permits a sewage discharge to any state waters:
• must immediately notify the local health agency of the discharge. • shall reimburse the local health agency for services that protect the public’s health and safety (water-contact receiving waters). • who fails to provide the required notice to the local health agency is guilty of a misdemeanor and shall be punished by a fine (between $500–$1,000) and/or imprisonment for less than one year. ! Requires the prevention, mitigation, response to and reporting of sewage spills.

California Water Code, Article 4, Chapter 4, Sections 13268-13271 California Code of Regulations, Title 23, Division 3, Chapter 9.2, Article 2, Sections 2250-2260
! Any person who causes or permits sewage in excess of 1,000 gallons to be discharged to state waters shall immediately notify the Office of Emergency Services.
! Any person who fails to provide the notice required by this section is guilty of a misdemeanor and shall be punished by a fine (less than $20,000) and/or imprisonment for not more than one year.

Orange County Health Care Agency
Environmental Health
(714) 433-6419
Regional Water Quality Control Board
Santa Ana Region San Diego Region
(951) 782-4130 (858) 467-2952
California Office of Emergency Services
(800) 852-7550
What is a
Sewage Spill?
You Are Responsible for a
Sewage Spill Caused by a Blockage
or Break in Your Sewer Lines!
Grease builds up inside and eventually blocks
sewer pipes. Grease gets into the sewer from food
establishments, household drains, as well as from poorly maintained commercial grease traps and interceptors.

Structure problems caused by tree roots in the lines,
broken/cracked pipes, missing or broken cleanout caps
or undersized sewers can cause blockages.

Infiltration and inflow (I/I) impacts pipe capacity and is caused when groundwater or rainwater enters the
sewer system through pipe defects and illegal
connections.

Time is of the essence in dealing with sewage spills. You are required to immediately:

Control and minimize the spill. Keep spills contained
on private property and out of gutters, storm drains and public waterways by shutting off or not using the water.

Use sandbags, dirt and/or plastic sheeting to
prevent sewage from entering the storm drain system.

Clear the sewer blockage. Always wear gloves and
wash your hands. It is recommended that a plumbing
professional be called for clearing blockages and making necessary repairs.

Always notify your city sewer/public works
department or public sewer district of sewage
spills. If the spill enters the storm drains also notify the Health Care Agency. In addition, if it exceeds 1,000
gallons notify the Office of Emergency Services. Refer to the numbers listed in this brochure.

Caution
Allowing sewage from your home, business or property
to discharge to a gutter or storm drain may subject you to penalties and/or out-of-pocket costs to reimburse cities or public agencies for clean-up and enforcement efforts.

See Regulatory Codes & Fines section for pertinent codes and fines that apply.

What to Look For
You Could Be Liable
Sewage spills can be a very noticeable gushing of water from a manhole or a slow water leak that may take time to be noticed. Don’t dismiss unaccounted-for wet areas.

Look for:
! Drain backups inside the building.
! Wet ground and water leaking around manhole lids
onto your street.
! Leaking water from cleanouts or outside drains.
! Unusual odorous wet areas: sidewalks, external
walls or ground/landscape around a building.

Rev 4/06
printed on recycled paper
Common Causes
of Sewage Spills
Overflowing
cleanout pipe
located on
private property
Keep people and pets away from the affected area.

Untreated sewage has high levels of disease-causing
viruses and bacteria. Call your local health care agency listed on the back for more information.

DTP113
Sewage spills occur when the wastewater being
transported via underground pipes overflows through
a manhole, cleanout or broken pipe. Sewage spills can
cause health hazards, damage to homes and businesses,
and threaten the environment, local waterways and
beaches.

Health Care Agency
Environmental Health
CA
IA
LIFORN

Y OF OR
TA
NN
U
G
O
E
C
If You See a Sewage Spill Occurring,
Notify Your City Sewer/Public Works
Department or Public Sewer District
IMMEDIATELY!
www.ocwatersheds.com

P R O J E C T

P R E V E N T I O N
Residences
Businesses
Homeowner/Condominium Associations
Federal and State Complexes
Military Facilities
Orange County
Sanitation District

How a Sewer
System Works
Orange County
Agency Responsibilites
You Could Be Liable
for Not Protecting
the Environment
Local and state agencies have legal jurisdiction and enforcement authority to ensure that sewage spills are remedied.

They may respond and assist with containment, relieving pipe blockages, and/or clean-up of the sewage spill, especially if
the spill is flowing into storm drains or onto
public property.

A property owner may be charged for
costs incurred by these agencies
responding to spills from private
properties .

How You Can
Prevent Sewage Spills
A property owner's sewer pipes are called
service laterals and are connected to larger
local main and regional trunk lines. Service
laterals run from the connection at the
home to the connection with the public
sewer (including the area under the street).

These laterals are the responsibility of the
property owner and must be maintained
by the property owner. Many city agencies
have adopted ordinances requiring
maintenance of service laterals. Check with
your city sewer/local public works
department for more information.

Operation and maintenance of local and
regional sewer lines are the responsibility of the city sewer/public works departments and public sewer districts.

Preventing
Grease Blockages
The drain is not a dump! Recycle or dispose of grease
properly and never pour grease down the drain.

Homeowners should mix fats, oils and grease with absorbent waste materials such as paper, coffee grounds, or kitty litter and place it in the trash. Wipe food scraps from plates and pans and dump them in the trash.

Restaurants and commercial food service establishments
should always use “Kitchen Best Management Practices.”
These include:
! Collecting all cooking grease and liquid oil from pots, pans and fryers in covered grease containers for recycling.
! Scraping or dry-wiping excess food and grease from
dishes, pots, pans and fryers into the trash.
! Installing drain screens on all kitchen drains.
! Having spill kits readily available for cleaning up spills. ! Properly maintaining grease traps or interceptors by having them serviced regularly. Check your local city codes.
! City Sewer/Public Works Departments—
Responsible for protecting city property
and streets, the local storm drain system, sewage
collection system and other public areas.
! Public Sewer /Sani tat ion Dist r ict—
Responsible for collecting, treating and disposing
of wastewater.
! County of Orange Health Care Agency—
Responsible for protecting public health by closing
ocean/bay waters and may close food-service
businesses if a spill poses a threat to public health.
! Regional Water Quality Control Boards—
Responsible for protecting State waters.
! Orange County Stormwater Program—
Responsible for preventing harmful pollutants from
being discharged or washed by stormwater runoff
into the municipal storm drain system, creeks, bays
and the ocean.
2 3
1 Never put grease down garbage
disposals, drains or toilets.

Perform periodic cleaning to
eliminate grease, debris and roots in
your service laterals.

Repair any structural problems
in your sewer system and eliminate
any rainwater infiltration/inflow
leaks into your service laterals.

Sewage spills can cause
damage to the environment.

Help prevent them!
Regional
Trunk line
Sewer
Wastewater
Treatment
Plant
Cleanout
Cleanout Grease
Trap
Downspout
(rain water goes into
the storm drain system,
not the sewer)

RESIDENCE

BUSINESS
Manhole
Local Main
Sewer Line
Private
Service
Laterals
Manhole
City Sewer/Public Works Departments
Aliso Viejo . . . . . . . . . . . . . . . . . . . . . . . . . (949) 425-2500 Anaheim. . . . . . . . . . . . . . . . . . . . . . . . . . . (714) 765-6860 Brea . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (714) 990-7691 Buena Park . . . . . . . . . . . . . . . . . . . . . . . . (714) 562-3655 Costa Mesa . . . . . . . . . . . . . . . . . . . . . . . . (949) 645-8400 Cypress . . . . . . . . . . . . . . . . . . . . . . . . . . . (714) 229-6760 Dana Point . . . . . . . . . . . . . . . . . . . . . . . . . (949) 248-3562 Fountain Valley . . . . . . . . . . . . . . . . . . . . . (714) 593-4600 Fullerton. . . . . . . . . . . . . . . . . . . . . . . . . . . (714) 738-6897 Garden Grove. . . . . . . . . . . . . . . . . . . . . . . (714) 741-5375 Huntington Beach . . . . . . . . . . . . . . . . . . . (714) 536-5921 Irvine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (949) 453-5300 Laguna Beach . . . . . . . . . . . . . . . . . . . . . . (949) 497-0765 Laguna Hills . . . . . . . . . . . . . . . . . . . . . . . . (949) 707-2650 Laguna Niguel . . . . . . . . . . . . . . . . . . . . . . (949) 362-4337 Laguna Woods . . . . . . . . . . . . . . . . . . . . . . (949) 639-0500 La Habra. . . . . . . . . . . . . . . . . . . . . . . . . . . (562) 905-9792 Lake Forest . . . . . . . . . . . . . . . . . . . . (949) 461-3480 La Palma . . . . . . . . . . . . . . . . . . . . . . . . . . (714) 690-3310 Los Alamitos . . . . . . . . . . . . . . . . . . . . . . . (562) 431-3538 Mission Viejo. . . . . . . . . . . . . . . . . . . . . . . (949) 831-2500 Newport Beach . . . . . . . . . . . . . . . . . . . . . (949) 644-3011 Orange . . . . . . . . . . . . . . . . . . . . . . . . . . . . (714) 532-6480 Orange County . . . . . . . . . . . . . . . . . . . . . . (714) 567-6363 Placentia . . . . . . . . . . . . . . . . . . . . . . . . . . (714) 993-8245 Rancho Santa Margarita. . . . . . . . . . . . (949) 635-1800 San Clemente. . . . . . . . . . . . . . . . . . . . . . . (949) 366-1553 San Juan Capistrano . . . . . . . . . . . . . . . . (949) 443-6363 Santa Ana . . . . . . . . . . . . . . . . . . . . . . . . . (714) 647-3380 Seal Beach. . . . . . . . . . . . . . . . . . . . . . . . . (562) 431-2527 Stanton . . . . . . . . . . . . . . . . . . . . . . . . . . . (714) 379-9222 Tustin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (714) 962-2411 Villa Park . . . . . . . . . . . . . . . . . . . . . . . . . . (714) 998-1500 Westminster . . . . . . . . . . . . . . . . . . . . . . . (714) 893-3553 Yorba Linda . . . . . . . . . . . . . . . . . . . . . . . . (714) 961-7170 Public Sewer/Water Districts
Costa Mesa Sanitary District . . . . . . . . . . (714) 393-4433/ (949) 645-8400
El Toro Water District . . . . . . . . . . . . . . . . (949) 837-0660 Emerald Bay Service District . . . . . . . . . . (949) 494-8571 Garden Grove Sanitary District . . . . . . . . . (714) 741-5375 Irvine Ranch Water District . . . . . . . . . . . . (949) 453-5300 Los Alamitos/Rossmoor Sewer District . . . (562) 431-2223 Midway City Sanitary District (Westminster) (714) 893-3553 Moulton Niguel Water District . . . . . . . . . (949) 831-2500 Orange County Sanitation District. . . . . . . (714) 962-2411 Santa Margarita Water District . . . . . . . . (949) 459-6420 South Coast Water District . . . . . . . . . . . . (949) 499-4555 South Orange County Wastewater Authority (949) 234-5400 Sunset Beach Sanitary District. . . . . . . . . (562) 493-9932 Trabuco Canyon Sanitary District . . . . . . . (949) 858-0277 Yorba Linda Water District . . . . . . . . . . . . (714) 777-3018 Other Agencies
Orange County Health Care Agency . . . . . (714) 433-6419 Office of Emergency Services. . . . . . . . . . (800) 852-7550 Report Sewage Spills!

Ayude a prevenir
la contaminación del océano
For more information,
please call the
Orange County Stormwater Program
at 1-877-89-SPILL
(1-877-897-7455)
or visit
www.ocwatersheds.com.

For information about the proper
disposal of household hazardous
waste, call the Household Waste
Hotline at 1-877-89-SPILL
(1-877-897-7455)
or visit www.oclandfills.com.

For additional information about the
nearest oil recycling center, call the
Used Oil Program at
1-800-CLEANUP
or visit www.cleanup.org.

Help Prevent Ocean Pollution:

Tips for the
Home Mechanic
The Ocean Begins at
Your Front Door
Clean beaches and healthy
creeks, rivers, bays and
ocean are important to
Orange County. However, not
properly disposing of used oil is
illegal and can lead to fines. If you
pour or drain oil onto driveways,
sidewalks or streets, it can be
washed into the storm drain.

Help prevent water pollution by
taking your used oil and oil filters
to a used oil collection center. Most
major automotive maintenance
centers will accept up to five gallons
of used motor oil at no cost. For a
list of locations, please visit
www.cleanup.org.
emc/rev9/08 Page 1613 of 2028
Tips for the Home Mechanic
drain to the County’s 24-Hour Water
Pollution Problem Reporting Hotline
at 1-877-89-SPILL (1-877-897-7455) or
visit www.ocwatersheds.com to fill out
an incident report.
• Report emergencies to 911.

Vehicle Fluid Management
• Vehicle fluids are hazardous waste
and must be stored and disposed of
in accordance with all local, state and
federal laws.
• Designate an area to drain vehicle
fluids away from storm drains and
sanitary drains.
• When possible, drain vehicle fluids
indoors or within covered areas, and
only over floors that are constructed
of a nonporous
material
such as
concrete.

Asphalt and
dirt floors
absorb spilled or leaked fluids, making
the cleanup extremely difficult.

Work Site
• Locate the storm drains on or near
your property. Do not allow used oil
or any materials to flow into these
drains.
• Examine your home for sources of
pollution.
• Perform automotive projects under
cover and in a controlled area to
prevent stormwater runoff.
• Sweep or vacuum your automotive
workspace regularly
• Use a
damp mop
to clean
work areas.

Never
hose down
surfaces
into the
street, gutter or storm drain.
• Pour mop water into a sink or toilet.

Never dispose of water in a parking
lot, street, gutter or storm drain.

Prevent Leaks and Spills
• Keep absorbent materials such as rags
and/or cat litter in the work area
• Empty drip pans into a labeled, seal
container before they are full
• Wipe up any spills or repair leaks as they
happen. Don’t let them sit.
• Place large pans under any wrecked cars
until all fluids are drained.
• Promptly dispose of collected fluids into a
hazardous waste drum or deliver them to
an oil recycling center. Used oil recycling
locations can be found at http://www.
ochealthinfo.com/regulatory/usedoil.htm
Cleaning Spills
• Clean up spills immediately by using
absorbent material such as rags, cat litter
or sand. If the
material spilled
is hazardous,
dispose of the
rag, litter or
sand in the
same manner
as hazardous
waste. If the material spill is nonhazardous, dispose of it in the trash. • Immediately report spills that have
entered the street, gutter or storm

Help Prevent Ocean Pollution:

For more information,
please call the
Orange County Stormwater Program
at 1-877-89-SPILL (1-877-897-7455)
or visit
www.ocwatersheds.com
To report a spill,
call the
Orange County 24-Hour
Water Pollution Problem
Reporting Hotline
at 1-877-89-SPILL (1-877-897-7455).

For emergencies, dial 911.

The tips contained in this brochure provide useful
information to help prevent water pollution while
performing home improvement projects. If you
have other suggestions, please contact your city’s
stormwater representatives or call the Orange
County Stormwater Program.

Clean beaches
and healthy
creeks, rivers, bays
and ocean are important to
Orange County. However, many
common activities can lead to
water pollution if you’re not
careful. Home improvement
projects and work sites must
be maintained to ensure that
building materials do not enter
the street, gutter or storm drain.

Unlike water in sanitary sewers
(from sinks and toilets), water
in storm drains is not treated
before entering our waterways.

You would never dump building
materials into the ocean, so
don’t let them enter the storm
drains. Follow these tips to help
prevent water pollution.

Tips for Pool Maintenance
When permanently removing large quantities of
soil, a disposal location must be found prior to
excavation. Numerous businesses are available to
handle disposal needs. For disposal options, visit
www.ciwmb.ca.gov/SWIS.

Prevent erosion by planting fast-growing annual and
perennial grasses. They will shield and bind the soil.

Recycle
Use a construction and demolition recycling
company to recycle
lumber, paper,
cardboard, metals,
masonry (bricks,
concrete, etc.), carpet,
plastic, pipes (plastic,
metal and clay),
drywall, rocks, dirt and
green waste.

For a listing of construction and demolition recycling
locations in your area, visit
www.ciwmb.ca.gov/recycle.

Spills
Clean up spills immediately by using an absorbent
material such as cat litter, then sweep it up and
dispose of it in the trash.

Immediately report spills that have entered the street, gutter or storm drain to the County’s 24-Hour Water
Pollution Problem Reporting Hotline at
(714) 567-6363 or visit www.ocwatersheds.com to fill
out an incident reporting form.

Home improvement projects can cause significant
damage to the environment. Whether you hire
a contractor or work on the house yourself, it
is important to follow these simple tips while
renovating, remodeling or improving your home:

General Construction
Schedule projects for dry
weather.

Keep all construction debris
away from the street, gutter
and storm drain.

Store materials under cover
with temporary roofs or plastic
sheets to eliminate or reduce
the possibility that rainfall,
runoff or wind will carry
materials from the project site
to the street, storm drain or
adjacent properties.

Building Materials
Never hose materials into a street, gutter or storm
drain.

Exposed piles of construction material should not be
stored on the street or sidewalk.

Minimize waste by ordering only the amount of
materials needed to complete the job.

Do not mix more fresh concrete than is needed for
each project.

Wash concrete mixers and equipment in a
designated washout area where the water can flow
into a containment area or onto dirt.

Dispose of small amounts of dry excess materials in
the trash. Powdery waste, such as dry concrete, must
be properly contained within a box or bag prior to
disposal. Call your local trash hauler for weight and
size limits.

Paint
Measure the room or object to be painted, then buy
only the amount needed.

Place the lid on firmly and store the paint can upsidedown in a dry location away from the elements.

Tools such as brushes, buckets and rags should never
be washed where excess water can drain into the
street, gutter or storm drain. All tools should be
rinsed in a sink connected to the sanitary sewer.

When disposing of paint, never put wet paint in the
trash.

Dispose of water-based paint by removing the lid
and letting it dry
in the can. Large
amounts must be
taken to a Household
Hazardous Waste
Collection Center
(HHWCC).

Oil-based paint is a
household hazardous
waste. All leftover
paint should be taken
to a HHWCC.

For HHWCC locations and hours, call (714) 834-6752
or visit www.oclandfills.com.

Erosion Control
Schedule grading and excavation projects for dry
weather.

When temporarily removing soil, pile it in a
contained, covered area where it cannot spill
into the street, or obtain the required temporary
encroachment or street closure permit and follow the
conditions instructed by the permit.

Tips for Home Improvement Projects

For more information,
please call the
Orange County Stormwater Program
at 1-877-89-SPILL (1-877-897-7455)
or visit
www.ocwatersheds.com
UCCE Master Gardener Hotline:
(714) 708-1646
To report a spill,
call the
Orange County 24-Hour
Water Pollution Problem
Reporting Hotline
1-877-89-SPILL (1-877-897-7455).

For emergencies, dial 911.

The tips contained in this brochure provide useful
information to help prevent water pollution
while landscaping or gardening. If you have other
suggestions, please contact your city’s stormwater
representatives or call the Orange County
Stormwater Program.

C lean beaches
and healthy
creeks, rivers, bays
and ocean are important to
Orange County. However,
many common activities
can lead to water pollution
if you’re not careful.

Fertilizers, pesticides and
other chemicals that are left
on yards or driveways can
be blown or washed into
storm drains that flow to the
ocean. Overwatering lawns
can also send materials into
storm drains. Unlike water
in sanitary sewers (from sinks
and toilets), water in storm
drains is not treated before
entering our waterways.

You would never pour
gardening products into the
ocean, so don’t let them enter
the storm drains. Follow
these easy tips to help prevent
water pollution.

Tips for Landscape and Gardening Tips for Landscape & Gardening Never allow gardening products or
polluted water to enter the street, gutter
or storm drain.

General Landscaping Tips
Protect stockpiles and materials from
wind and rain by storing them under
tarps or secured plastic sheeting.

Prevent erosion of slopes by planting
fast-growing, dense ground covering
plants. These will shield and bind the
soil.

Plant native vegetation
to reduce the amount
of water, fertilizers, and
pesticide applied to the
landscape.

Never apply pesticides
or fertilizers when rain is
predicted within the next 48 hours.

Garden & Lawn Maintenance
Do not overwater. Use irrigation
practices such as drip irrigation,
soaker hoses or micro spray systems.

Periodically inspect and fix leaks and
misdirected sprinklers.

Do not rake or blow
leaves, clippings or
pruning waste into
the street, gutter
or storm drain.

Instead, dispose
of green waste by
composting, hauling
it to a permitted
landfill, or recycling it through your
city’s program.

Use slow-release fertilizers to
minimize leaching, and use organic
fertilizers.

Read labels and use only as directed.

Do not over-apply pesticides or
fertilizers. Apply to spots as needed,
rather than blanketing an entire
area.

Store pesticides, fertilizers and other
chemicals in a dry covered area to
prevent exposure that may result
in the deterioration
of containers and
packaging.

Rinse empty
pesticide containers
and re-use rinse water
as you would use the
product. Do not dump rinse water
down storm drains. Dispose of empty
containers in the trash.

When available, use non-toxic
alternatives to traditional pesticides,
and use pesticides specifically
designed to control the pest you are
targeting. For more information, visit
www.ipm.ucdavis.edu.

If fertilizer is spilled, sweep up the
spill before irrigating. If the spill is
liquid, apply an absorbent material
such as cat litter, and then sweep it up
and dispose of it in the trash.

Take unwanted pesticides to a
Household Hazardous Waste
Collection Center to be recycled.

Locations are provided below.

Household Hazardous Waste
Collection Centers
Anaheim: 1071 N. Blue Gum St.

Huntington Beach: 17121 Nichols St.

Irvine: 6411 Oak Canyon
San Juan Capistrano: 32250 La Pata Ave.

For more information, call (714) 834-6752
or visit www.oclandfills.com

C lean beaches
and healthy
creeks, rivers, bays
and ocean are important to
Orange County. However,
many common activities
can lead to water pollution
if you’re not careful. Pet
waste and pet care products
can be washed into the
storm drains that flow to
the ocean. Unlike water in
sanitary sewers (from sinks
and toilets), water in storm
drains is not treated before
entering our waterways.

You would never put pet
waste or pet care products
into the ocean, so don’t let
them enter the storm drains.

Follow these easy tips to help
prevent water pollution.

For more information,
please call the
Orange County Stormwater Program
at 1-877-89-SPILL (1-877-897-7455)
or visit
www.ocwatersheds.com
To report a spill,
call the
Orange County 24-Hour
Water Pollution Problem
Reporting Hotline
1-877-89-SPILL (1-877-897-7455).

For emergencies, dial 911.

The tips contained in this brochure provide useful
information to help prevent water pollution while
caring for your pet. If you have other suggestions,
please contact your city’s stormwater representatives
or call the Orange County Stormwater Program.

Never let any pet care products or
washwater run off your yard and into
the street, gutter or storm drain.

Washing Your Pets
Even biodegradable soaps and
shampoos can be harmful to marine
life and the environment.

If possible, bathe your pets indoors
using less-toxic shampoos or have
your pet professionally groomed.

Follow instructions on the products
and clean up spills.

If you bathe your pet outside, wash it
on your lawn or another absorbent/
permeable surface to keep the
washwater from running into the
street, gutter or storm drain.

Flea Control
Consider using oral or topical flea
control products.

If you use flea control products
such as shampoos, sprays or collars,
make sure to dispose of any unused
products at
a Household
Hazardous
Waste
Collection
Center. For
location
information,
call (714) 834-6752.

Why You Should Pick Up After
Your Pet
It’s the law!
Every city has
an ordinance
requiring you
to pick up
after your pet.

Besides being
a nuisance, pet
waste can lead to water pollution, even
if you live inland. During rainfall, pet
waste left outdoors can wash into storm
drains. This waste flows directly into our
waterways and the ocean where it can
harm human health, marine life and
the environment.

As it decomposes, pet waste demands
a high level of oxygen from water.

This decomposition can contribute to
killing marine
life by reducing
the amount of
dissolved oxygen
available to
them.

Have fun with
your pets, but
please be a
responsible pet
owner by taking
care of them and the environment.

Take a bag with you on walks to pick
up after your pet.

Dispose of the waste in the trash or in
a toilet.

Tips for Pet Care

For more information,
please call the
Orange County Stormwater Program
at 1-877-89-SPILL (1-877-897-7455)
or visit
www.ocwatersheds.com
To report a spill,
call the
Orange County 24-Hour
Water Pollution Problem
Reporting Hotline
at 1-877-89-SPILL (1-877-897-7455).

For emergencies, dial 911.

The tips contained in this brochure provide useful
information to help prevent water pollution while
using, storing and disposing of paint. If you
have other suggestions, please contact your city’s
stormwater representatives or call the Orange
County Stormwater Program.

Clean beaches
and healthy
creeks, rivers, bays
and ocean are important to
Orange County. However,
many common activities
such as painting can lead
to water pollution if you’re
not careful. Paint must be
used, stored and disposed of
properly to ensure that it does
not enter the street, gutter or
storm drain. Unlike water in
sanitary sewers (from sinks
and toilets), water in storm
drains is not treated before
entering our waterways.

You would never dump paint
into the ocean, so don’t let
it enter the storm drains.

Follow these easy tips to help
prevent water pollution.

Tips for Pool Maintenance
Paint can cause significant damage to our
environment. Whether you hire a contractor or
do it yourself, it is important to follow these simple
tips when purchasing, using, cleaning, storing and
disposing of paint.

Purchasing Paint
Measure the room or object to be painted, then buy
only the amount needed.

Whenever possible, use water-based paint since it
usually does not require hazardous solvents such as
paint thinner for cleanup.

Painting
Use only one brush or roller per color of paint to
reduce the amount of water needed for cleaning.

Place open paint containers or trays on a stable
surface and in a position that is unlikely to spill.

Always use a tarp under the area or object being
painted to collect paint drips and contain spills.

Cleaning
Never clean brushes or rinse paint containers in the
street, gutter or storm drain.

For oil-based products, use as much of the paint on
the brushes as possible. Clean brushes with thinner.

To reuse thinner, pour it through a fine filter (e.g.
nylon, metal gauze or filter paper) to remove solids
such as leftover traces of paint.

For water-based products, use as much of the paint
on the brushes as possible, then rinse in the sink.

Collect all paint chips and dust. Chips and dust
from marine paints or paints containing lead,
mercury or tributyl tin are hazardous waste. Sweep
up and dispose of at a Household Hazardous Waste
Collection Center (HHWCC).

Storing Paint
Store paint in a dry location away from the elements.

Store leftover water-based paint, oil-based paint and
solvents separately in original or clearly marked
containers.

Avoid storing paint cans directly on cement floors.

The bottom of the can will rust much faster on
cement.

Place the lid on firmly and store the paint can upsidedown to prevent air from entering. This will keep the paint usable longer. Oil-based paint is usable for up
to 15 years. Water-based paint remains usable for up
to 10 years.

Alternatives to Disposal
Use excess paint to apply another coat, for touch-ups,
or to paint a closet, garage, basement or attic.

Give extra paint to friends or family. Extra paint can
also be donated to a local theatre group, low-income
housing program or school.

Take extra paint to an exchange program such as the
“Stop & Swap” that allows you to drop off or pick up
partially used home care products free of charge.
“Stop & Swap” programs are available at most
HHWCCs.

For HHWCC locations and hours, call (714) 834-6752
or visit www.oclandfills.com.

Disposing of Paint
Never put wet paint in the trash.

For water-based paint:

If possible, brush the leftover paint on cardboard or
newspaper. Otherwise, allow the paint to dry in the
can with the lid off in a well-ventilated area protected from the elements, children and pets. Stirring the
paint every few days will speed up the drying.

Large quantities of extra paint should be taken to a
HHWCC.

Once dried, paint and painted surfaces may be
disposed of in the trash. When setting a dried paint
can out for trash collection, leave the lid off so the
collector will see that the paint has dried.

For oil-based paint:

Oil-based paint is a household hazardous waste.

All leftover paint should be taken to a HHWCC.

Aerosol paint:

Dispose of aerosol paint cans at a HHWCC.

Spills
Never hose down pavement or other impermeable
surfaces where paint has spilled.

Clean up spills immediately by using an absorbent
material such as cat litter. Cat litter used to clean
water-based paint spills can be disposed of in the
trash. When cleaning oil-based paint spills with cat
litter, it must be taken to a HHWCC.

Immediately report spills that have entered the
street, gutter or storm drain to the County’s 24-Hour
Water Pollution Problem Reporting Hotline at (714)
567-6363 or visit www.ocwatersheds.com to fill out an
incident reporting form.

Tips for Projects Using Paint

Project Overview
This technical memorandum presents an analysis of the air quality, energy, and greenhouse gas (GHG) impacts for the 19081 Yorba Linda Boulevard Residential Project (proposed Project). The Project site is situated in the central portion of the City of Yorba Linda within Orange County. The Project is located at 19081 Yorba Linda Boulevard. Regional access to the site is provided via State Route 90 (SR-90), SR-91, and SR-57. Local access to the site is provided via Yorba Linda Boulevard.

The Project site encompasses approximately 2.64 acres, inclusive of one parcel identified by Assessor’s Parcel Number (APN) 323-081-35. The site is currently developed with three residential buildings, various ancillary structures such as garages, storage sheds, and share structures, and a small orchard with additional ornamental landscaping. The site also contains an existing asphalt and concrete driveway along Yorba Linda Boulevard that extends along the eastern length of the site.

The Project site has a General Plan land use designation of Residential High (R-H) and a zoning designation of Residential Multiple-Family 20 (RM-20). These residential designations are intended to accommodate a range of housing types, including single-family attached and detached homes, townhomes, and multi-family residential units. The RM-20 zoning district is intended to promote the development of multi-family rental as well as ownership dwelling units up to 20 units per acre.

The Project applicant proposes to construct 62 attached townhome residential units on the 2.64-acre site, resulting in a density of 23 dwelling units per acre (du/ac). The Project proposes to set aside four (4) of the 62 proposed units, or 6 percent of the total units, for very-low income households. As set forth in Yorba Linda Municipal Code Section 18.19.040, restricting 6 percent of the proposed units for very-low income households would afford the Project a 22.5 percent density bonus. The proposed Project would also include associated improvements such as landscaping, parking, private roadways, common and private open space areas, and utility and stormwater infrastructure. In addition, the proposed Project would improve Yorba Linda Boulevard by removing and replacing the existing 6-inch curb, 2-foot gutter, and 4.5-foot sidewalk along the Project frontage. The site aerial and site plan are shown in Figure 1, Project Site Aerial, and Figure 2, Conceptual Site Plan, included at the end of this document.

To support the California Environmental Quality Act (CEQA) document for the Project, this report analyzes the proposed Project’s construction and operational impacts to air quality (emission of criteria pollutants), energy usage, and GHG emissions using the California Emissions Estimator Model (CalEEMod Version 2022.1) land use emission model and Emission Factor (EMFAC Version 2021) model. The Project site is within the jurisdiction of the South Coast Air Quality Management District (SCAQMD). Therefore, significance thresholds from SCAQMD are used. In addition, the Project area is one of the sites evaluated in the City of Yorba Linda’s Housing Element Implementation Programs Program Environmental Impact Report (HEIP PEIR), as Site ID S4-204B. Thus, conclusions from the HEIP PEIR have been included for each topic.

To: City of Yorba Linda Planning Department
From: Tiffany Dang, Tina Yuan, Alex J. Garber, EPD Solutions, Inc.

Date: 8/4/2025
Re: Air Quality, Energy, and Greenhouse Gas Impact Analysis for the 19081 Yorba Linda Boulevard Residential Project, EPD Project Number 25-062

19081 Yorba Linda Boulevard Residential Project
2 Air Quality, Energy, and GHG Impact Analysis
Summary of Air Quality, Energy, and GHG Impacts
Air Quality
The proposed Project’s maximum daily emissions for construction would exceed SCAQMD’s regional threshold of significance for reactive organic gases (ROG) without mitigation. All other criteria pollutants would be below threshold levels. However, operation of the Project would not exceed SCAQMD’s regional thresholds of significance and would not require mitigation.

With mandatory compliance with the 2022 Mitigation Monitoring and Reporting Program Yorba Linda 2021-2029 Housing Element Implementation Programs Project’s (2022 Certified PEIR MMRP) mitigation measures and SCAQMD’s regulations, construction and operation of the proposed Project would not exceed SCAQMD thresholds for any of the six criteria pollutants. Mitigation Measure 4.1-1, listed below, would reduce ROG emissions below construction thresholds.1
Mitigation Measure 4.1-1. Prior to the issuance of grading permits, project applicants shall prepare and submit a technical assessment evaluating potential project construction-related air quality impacts (regional and localized to the City for review and approval The evaluation shall be prepared in conformance with South Coast Air Quality Management District (South Coast AQMD) methodology for assessing air quality impacts. If construction-related criteria air pollutants are determined to have the potential to exceed the South Coast AQMD’s adopted thresholds of significance, the City shall require that applicants for new development projects incorporate all feasible mitigation measures to reduce air pollutant emissions below the significant threshold during construction activities . . . Mitigation measures to reduce construction-related emission could include, but are not limited to: . . .
• Require the use of “Super-Compliant” low VOC paints which have been reformulated to exceed the regulatory VOC limits put forth by South Coast AQMD’s Rule 1113. Super-Compliant low VOC paints shall be no more than 10 gram/Liter (g/L) of VOC. Alternatively, projects may utilize building materials that do not require the use of architectural coatings. . .

Projects that do not exceed regional thresholds are assumed not to have a significant impact on both a project level and a cumulative level. The proposed Project aligns with SCAQMD’S 2022 Air Quality Management Plan (AQMP), reflecting adherence to regional air quality management goals and standards.

Furthermore, odors produced by the construction and operation of the proposed Project would be minimal and comply with applicable SCAQMD rules and regulations, including Rule 402, 403, 445, 1113, and 1403.

These rules are explained in further detail in the Air Quality analysis section. Therefore, the proposed Project would have less than significant air quality impacts. Therefore, the proposed Project would not result in any new impacts not previously identified in the HEIP PEIR.

Energy
The proposed Project’s energy consumption for construction activities would be conditioned to require compliance with existing fuel standards, machinery efficiency standards, and California Air Resources Board (CARB) requirements that limit idling of construction trucks and equipment. There are no unusual Project characteristics that would cause the use of construction equipment that would be less energy efficient compared with other similar construction sites in other parts of the state. Additionally, through compliance 1 City of Yorba Linda. (2022). Mitigation Monitoring and Reporting Program Yorba Linda 2021-2029 Housing Element Implementation Programs Project. Referenced at: https://www.yorbalindaca.gov/DocumentCenter/View/8031/2022- Certified-PEIR-Mitigation-Monitoring-and-Reporting-Program-PDF

19081 Yorba Linda Boulevard Residential Project
3 Air Quality, Energy, and GHG Impact Analysis
with existing standards, operation of the Project would not result in an energy demand on a per-development basis that is greater than other development projects in Southern California. Additionally, the proposed Project would be required to meet the California Code of Regulations (CCR) Title 24 energy efficiency standards and comply with all applicable City energy codes. The Project buildings would install solar panels in compliance with current Title 24 requirements. Therefore, the Project would not inhibit the use of, and would instead allow, for future flexibility relating to renewable energy. Additionally, the Project would result in a less-than-significant impact related to inefficient, wasteful, or unnecessary consumption of energy. No mitigation would be required. Therefore, the proposed Project would not result in any new impacts not previously identified in the HEIP PEIR.

GHG Emissions
The proposed Project’s construction and operational GHG emissions would total 382 metric tons of carbon dioxide equivalent (MTCO2e). The Project’s total GHG emissions would not exceed SCAQMD’s Tier III significance threshold of 3,000 MTCO2e per year. However, compared to the Tier IV threshold used in the HEIP EIR of 1.44 MTCO2e per capita, the Project would exceed thresholds. Therefore, the proposed Project would be required to implement Mitigation Measure 4.1-2, listed below, to the extent feasible.

Mitigation Measure 4.1-2. Prior to issuance of a grading permit, project applicants shall prepare and submit a technical assessment evaluating potential project operation air quality impacts (regional and localized) to the City for review and approval. The evaluation shall be prepared in conformance with South Coast Air Quality Management District (South Coast AQMD) methodology in assessing air quality impacts. If operation-related air pollutants are determined to have the potential to exceed the South Coast AQMD’s adopted thresholds of significance, the City shall require that applicants for new development projects incorporate all feasible mitigation measures to reduce air pollutant emissions below significance thresholds during operational activities. The identified measures shall be included as part of the conditions of approval. Possible mitigation measures to reduce operational emissions could include, but are not limited to the following:
• Increase in insulation such that heat transfer and thermal bridging is minimized; • Limit air leakage through the structure and/or within the heating and cooling distribution system; • Use of energy-efficient space heating and cooling equipment; • Installation of electrical hook-ups at loading dock areas; • Installation of dual-paned or other energy efficient windows; • Use of interior and exterior energy efficient lighting that exceeds then incumbent California Title 24 Energy Efficiency performance standards;
• Installation of automatic devices to turn off lights where they are not needed; • Application of a paint and surface color palette that emphasizes light and off-white colors that reflect heat away from buildings;
• Design of buildings with “cool roofs” using products certified by the Cool Roof Rating Council, and/or exposed roof surfaces using light and off-white colors; • Design of buildings to accommodate photovoltaic solar electricity systems or the installation of photovoltaic solar electricity systems;

19081 Yorba Linda Boulevard Residential Project
4 Air Quality, Energy, and GHG Impact Analysis
• Installation of ENERGY STAR-qualified energy-efficient appliances, heating and cooling systems, office equipment, and/or lighting products.
• Landscaping palette emphasizing drought tolerant plants; • Use of water-efficient irrigation techniques;
• U.S. EPA Certified WaterSense labeled or equivalent faucets, high-efficiency toilets (HETs), and water-conserving shower heads.
• Applicants for residential within 1,000 feet of a major sources of TACs (e.g., warehouses, industrial areas, freeways, roadways, and rail lines with traffic volumes over 10,000 vehicle per day), as measured from the property line of the project to the property line of the source/edge of the nearest travel lane, shall submit a health risk assessment (HRA) to the City of Yorba Linda prior to future discretionary Project approval. The HRA shall be prepared in accordance with policies and procedures of CEQA and the South Coast AQMD. If the HRA shows that the incremental cancer risk exceeds ten in one million (10E-06), PM10 concentrations exceed 2.5 microgram per cubic meter (µg/m3), PM2.5 concentrations exceed 2.5 µg/m3, or the appropriate noncancer hazard index exceeds 1.0, the applicant will be required to identify and demonstrate that mitigation measures are capable of reducing potential cancer and non-cancer risks to an acceptable level (i.e., below ten in one million or a hazard index of 1.0), including appropriate enforcement mechanisms.

Measures to reduce risk may include but are not limited to:
o Air intakes located away from high volume roadways and/or truck loading zones. o Heating, ventilation, and air conditioning systems of the buildings provided with appropriately sized maximum efficiency rating value (MERV) filters (e.g., MERV 13 or better)
However, approximately 84 percent of GHG emissions derive from mobile source emissions. Reductions in GHG emissions would result from implementation of energy efficient appliances but would not reduce the Project’s emissions below the 1.44 MTCO2e per capita threshold. There are no feasible mitigation measures to reduce the Project’s mobile exhaust emissions. Therefore, the Project would have a significant and unavoidable impact to GHG emissions, consistent with what was found in the HEIP PEIR. The proposed Project would not result in any new impacts to GHG that were not previously identified in the HEIP PEIR.

The proposed Project is consistent with the actions and measures of CARB’s 2022 Scoping Plan and would not interfere with the policies and goals set within those plans. Therefore, the Project would have a less-thansignificant impact on GHG reduction plan consistency.

19081 Yorba Linda Boulevard Residential Project
5 Air Quality, Energy, and GHG Impact Analysis
Methodology
To calculate the construction and operational impacts, air quality emissions, energy consumption, and GHG emissions were estimated using CalEEMod v. 2022.1 and EMFAC v. 2021. CalEEMod outputs have been included as Appendix A. The passenger vehicles were analyzed using the CalEEMod default trip distance information. 2 Table 1, Construction Schedule, shows the CalEEMod default construction schedule that was modeled.

Table 1: Construction Schedule
The following non-default assumptions and adjustments were used in the CalEEMod emission model for this analysis:
• Land Use: The lot acreage and building square footage was adjusted to match the site plan. • Construction, Off-Road Equipment: It was conservatively assumed that all equipment would be used for 8 hours per workday. Tractors/loaders/backhoes were replaced with crawler tractors in the site preparation and grading phases to accurately measure acres disturbed. One “other construction equipment” was included to account for a woodchipper in the site preparation phase. • Construction, Dust from Material Movement: Based on information provided by the Project Applicant, the grading phase is expected to result in approximately a net export of 10,178 cubic yards of soil. • Construction, Demolition: Based on aerial measurements and standard estimates of building material and hardscape weight, demolition debris estimated was 1,172 tons. Detailed demolition calculations are included in Appendix B.
• Operations, Vehicle Data: Weekday, Saturday, and Sunday trip rates were adjusted to match the Institute of Transportation Engineers (ITE) Trip Generation Manual, 11th Edition, auto trip rates for multifamily housing (Land Use Code 220). • Operations, Hearths: Wood burning fireplaces and stoves were removed as they are prohibited by SCAQMD Rule 445.
• Operations, Energy: Annual natural gas consumption was zeroed since the Project does not propose any natural gas connections.
• Measures, Transportation: The Project proposes four (4) units to be set aside for very-low-income households, which would qualify the Project for a 22.5 percent density bonus. The Project’s density with this bonus would be 23 du/ac.
2 EPD utilized the Metropolitan Planning Organization (MPO) default data provided in CalEEMod, as it provides more accurate trip length data than the region-wide CSTDM trip length data.

Activity Start Date End Date Total Working Days
Demolition 9/1/2026 9/29/2026 20
Site Preparation 9/30/2026 10/4/2026 3
Grading 10/5/2026 10/13/2026 6
Building Construction 10/14/2026 8/18/2027 220
Paving 8/19/2027 9/2/2027 10
Architectural Coating 9/3/2027 9/17/2027 10
Source: CalEEMod Output Sheets (see Appendix A).

19081 Yorba Linda Boulevard Residential Project
6 Air Quality, Energy, and GHG Impact Analysis
Air Quality
Regional Emissions
SCAQMD has adopted maximum daily emission thresholds (pounds/day) for the criteria pollutants during construction and operation of a project.3 While incremental regional air quality impacts of an individual project are generally very small and difficult to measure, SCAQMD’s regional maximum emission thresholds set standards to reduce the burden of SCAQMD to attain and maintain ambient air quality standards. The CalEEMod Project emissions along with regional construction and operational thresholds for each of the criteria pollutants are listed in Table 2, Unmitigated Regional Construction Emission Estimates, and Table 4, Regional Operational Emission Estimates, respectively. These emission thresholds include the Project emissions generated both from on-site sources (such as off-road construction equipment and fugitive dust) and off-site sources (vehicle travel arriving to and leaving from the site).

Project construction would also be required to comply with several SCAQMD rules and regulations which would further reduce impacts to air quality emissions. The applicable rules are listed in further detail, below.

CalEEMod modeling inputs have accounted for reductions pursuant to compliance with Rule 403, 445, 1113, and 1403.:
• Rule 402, Public Nuisance: Prohibits the discharge of air contaminants that cause injury, nuisance, or annoyance to the public or damage to property.
• Rule 403, Fugitive Dust: Aims to minimize fugitive particulate matter dust emissions during construction activities.
• Rule 445, Wood Burning Devices: Restricts wood burning devices from being installed into any new development and is intended to reduce the emissions of particulate matter for wood burning devices. • Rule 1113, Architectural Coatings: Allows only low-volatile organic compounds (VOC) paints to be used. • Rule 1403, Asbestos Emissions from Demolition/Renovation Activities: Establishes work practice requirements to limit asbestos emissions from building demolition or renovation. These requirements include asbestos surveying, public notification, removal and handling procedures, time schedules, and storage/disposal/landfill requirements. Records of compliance must be maintained and all appropriate warning labels, signs, and marking must be utilized.

The CalEEMod output sheets for the proposed Project can be found in Appendix A. In addition, detailed tables showing the emissions from each construction phase can be found in Appendix C. As noted in Table 2, maximum daily ROG emissions during construction would be 106.5 pounds/day, which exceeds the SCAQMD regional construction threshold of 75 pounds/day.
3 SCAQMD. (March 2023). South Coast AQMD Air Quality Significance Thresholds. Referenced at https://www.aqmd.gov/docs/default-source/ceqa/handbook/south-coast-aqmd-air-quality-significancethresholds.pdf?sfvrsn=25.

19081 Yorba Linda Boulevard Residential Project
7 Air Quality, Energy, and GHG Impact Analysis
Table 2: Unmitigated Regional Construction Emission Estimates Construction Year
Maximum Daily Regional Emissions
(pounds/day)
ROG NOx CO SO2 PM10 PM2.5
Year 1 (2026) 2.0 33.8 23.8 0.1 7.1 3.0
Year 2 (2027) 106.5 10.4 14.7 0.0 1.0 0.5
Maximum Daily Emissions (2026-2027) 106.5 33.8 23.8 0.1 7.1 3.0 SCAQMD Significance Thresholds 75 100 550 150 150 55
Threshold Exceeded? Yes No No No No No
Notes: ROG = reactive organic gases, NOx = nitrogen oxides, CO = carbon monoxide, SO2 = sulfur dioxide, PM10 = particulate matter 10 microns in diameter, PM2.5 = particulate matter 2.5 microns in diameter Source: CalEEMod Output Sheets (see Appendix A).

The proposed Project would be required to implement Mitigation Measure 4.1-1 from the 2022 Certified PEIR MMRP to reduce potentially significant impacts from construction ROG emissions, as stated below.

Mitigation Measure 4.-1. . . .Require the use of “Super-Compliant” low VOC paints which have been reformulated to exceed the regulatory VOC limits put forth by South Coast AQMD’s Rule 1113.

Super-Compliant low VOC paints shall be no more than 10g/L of VOC. Alternatively, projects may utilize building materials that do not require the use of architectural coatings. . .

Thus, Table 3, Mitigated Regional Construction Emissions Estimates, show the results of the mitigated maximum daily regional emissions. ROG emissions would be reduced to 22.5 pounds/day, which would be below the SCAQMD significance threshold. Detailed tables showing the emissions from each construction phase can be found in Appendix C. Therefore, the Project would result in less-than-significant regional construction impacts with mitigation implemented.

Table 3: Mitigated Regional Construction Emission Estimates Construction Year
Maximum Daily Regional Emissions
(pounds/day)
ROG NOx CO SO2 PM10 PM2.5
Year 1 (2026) 2.0 33.8 23.8 0.1 7.1 3.0
Year 2 (2027) 22.5 10.4 14.7 0.0 1.0 0.5
Maximum Daily Emissions (2026-2027) 22.5 33.8 23.8 0.1 7.1 3.0 SCAQMD Significance Thresholds 75 100 550 150 150 55
Threshold Exceeded? No No No No No No
Notes: ROG = reactive organic gases, NOx = nitrogen oxides, CO = carbon monoxide, SO2 = sulfur dioxide, PM10 = particulate matter 10 microns in diameter, PM2.5 = particulate matter 2.5 microns in diameter Source: CalEEMod Output Sheets (see Appendix A).

The Project’s estimated maximum daily regional operational emissions estimates are provided in Table 4, Regional Operational Emission Estimates. The operational emissions provided below have accounted for the reduction of emissions resulting from the increased residential density. Operations would not exceed any of SCAQMD’s regional thresholds and no mitigation is required. Detailed tables showing the emissions from each construction phase can be found in Appendix C. Therefore, Project would result in less-than-significant regional operational impacts.

19081 Yorba Linda Boulevard Residential Project
8 Air Quality, Energy, and GHG Impact Analysis
Table 4: Regional Operational Emission Estimates
Operational Activity
Maximum Daily Regional Emissions1
(pounds/day)
ROG NOx CO SO2 PM10 PM2.5
Mobile 0.9 0.7 7.8 <0.1 2.0 0.5
Area 4.2 <0.1 3.5 <0.1 <0.1 <0.1
Energy <0.1 <0.1 <0.1 <0.1 <0.1 <0.1
Total Operational Emissions 5.1 0.8 11.3 <0.1 2.0 0.5
SCAQMD Significance Thresholds 55 55 550 150 150 55
Threshold Exceeded? No No No No No No
Notes: ROG = reactive organic gases, NOx = nitrogen oxides, CO = carbon monoxide, SO2 = sulfur dioxide, PM10 = particulate matter 10 microns in diameter, PM2.5 = particulate matter 2.5 microns in diameter 1The emissions provided account for the increased residential density at 23 du/ac.

Source: CalEEMod Output Sheets (see Appendix A).

Local Emissions
Localized significance thresholds (LSTs) were also adopted by the SCAQMD to evaluate projects which would not exceed the regional emission significance thresholds but may have the potential to exceed state and national air quality standards within a project’s vicinity. These thresholds set the maximum rates of daily construction or operational emissions from a project site that would not exceed a national or State ambient air quality standard. 4 The differences between regional thresholds and LSTs are as follows:

1. Regional thresholds include all sources of project construction and operational emissions generated from on-site and off-site emission sources whereas the LSTs only consider the emissions generated from on-site emission sources.

2. LSTs only apply to carbon monoxide (CO), nitrogen oxides (NOx), and particulate matter (PM10 and PM2.5), while regional thresholds include both reactive organic gases (ROG) and sulfur dioxide (SO2).

3. Regional thresholds apply to emission sources located anywhere within the SCAQMD whereas the LSTs are location dependent and rely on the size of the project and emission location relative to the nearest sensitive receptor. A sensitive receptor is defined as an individual who is most susceptible to negative health effects when exposed to air pollutants and includes children, the elderly, and adults with chronic health issues. Locations for sensitive receptors include residences, schools, elderly care centers, and hospitals.
4 SCAQMD. 2008: Final Localized Significance Threshold Methodology. Referenced at http://www.aqmd.gov/docs/defaultsource/ceqa/handbook/localized-significance-thresholds/final-lst-methodology-document.pdf

19081 Yorba Linda Boulevard Residential Project
9 Air Quality, Energy, and GHG Impact Analysis
SCAQMD provides screening tables (Appendix C of the SCAQMD 2008 Final Localized Significance Threshold Methodology) for projects that disturb less than or equal to 5 acres in a day. 5 These tables were created to easily determine if the daily emissions of NOx, CO, PM10, and PM2.5 from a project could result in a significant impact to the local air quality. The thresholds are determined by:
• Source receptor area (SRA), which is the geographic area within the SCAQMD that can act as both a source of emissions and a receptor of emission impacts (the Project is located within SRA 16, North Orange County);
• Size of grading disturbance (construction)/size of the project (operation); and • Distance to the nearest sensitive receptor.

Using SCAQMD’s methodology to estimate acres of ground disturbance, the site preparation phase was determined to result in a maximum of 2 acres of ground disturbance per day. Therefore, the SCAQMD thresholds for a 2-acre site were used. Calculations for site disturbance can be found in Appendix C.

Distance to the nearest sensitive receptor also determines the emission thresholds. There are existing singlefamily residential units in the vicinity of the Project site, with the closest unit approximately 4.5 meters (15 feet) north of the Project’s northern boundary. Therefore, the construction and operation emission thresholds for 25 meters were used, since it is the closest receptor distance for thresholds provided by the LST mass look up tables. Distance to this residential home is shown in Figure 3, Sensitive Receptor Location.

Table 6, Localized Construction Emission Estimates, shows the thresholds and estimated maximum daily construction emissions for the proposed Project. As shown in the table below, the proposed Project would not exceed the SCAQMD LST screening thresholds and would therefore have a less-than-significant localized construction air quality impact.

Table 5: Localized Construction Emission Estimates
Construction Year
Maximum Daily Regional Emissions
(pounds/day)
NOx CO PM10 PM2.5
Year 1 (2026) 15.8 15.6 3.0 1.7
Year 2 (2027) 5.7 8.2 0.2 0.2
Maximum Daily Emissions (2026-2027) 15.8 15.6 3.0 1.7
SCAQMD LST Screening Thresholds 170 883 7 4
Threshold Exceeded? No No No No
Notes: NOx = nitrogen oxides, CO = carbon monoxide, PM10 = particulate matter 10 microns in diameter, PM2.5 = particulate matter 2.5 microns in diameter
Source: CalEEMod Output Sheets (see Appendix A).

According to the SCAQMD LST methodology, LSTs apply to project-related stationary mobile sources.

Projects that involve mobile sources that spend long periods queuing and idling at a site, such as transfer facilities or warehousing and distribution buildings, have the potential to exceed the operational LSTs. The Project would operate as a residential community, which does not typically involve diesel vehicles regularly idling or queueing for long periods. Therefore, due to the lack of significant stationary source emissions or idling diesel-powered vehicles, impacts related to operational LSTs are presumed to be less than significant. 5 SCAQMD. 2008: Final Localized Significance Threshold Methodology Appendix C. Referenced at http://www.aqmd.gov/docs/default-source/ceqa/handbook/localized-significance-thresholds/appendix-c-mass-rate-lst-look-uptables.pdf?sfvrsn=2.

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Air Quality Management Plan Consistency
SCAQMD’s CEQA Handbook provides the following two criteria to determine whether a project would be consistent with the 2022 AQMP:

1. The Project would not generate population and employment growth that would be inconsistent with Southern California Association of Governments (SCAG)’s growth forecasts from the 2020-2045 Regional Transportation Plan/Sustainable Communities Strategy (2020-2045 RTP/SCS); or

2. The Project would not result in an increase in the frequency or severity of existing air quality violations or cause or contribute to new violations or delay the timely attainment of air quality standards or the interim emissions reductions specified in the AQMP.

Consistency Criterion No. 1 refers to the SCAG’s growth forecasts, and associated assumptions included in the AQMP. The future air quality levels projected in the AQMP are based on SCAG’s growth projections, which are based, in part, on the general plans of cities located within the SCAG region. Therefore, if the level of housing and employment growth related to the proposed Project is consistent with the applicable assumptions used in the development of the AQMP, the Project would not jeopardize attainment of the air quality levels identified in the AQMP. While SCAG has updated the 2020-2045 RTP/SCS to the 2024- 2050 RTP/SCS (Connect SoCal 2024), which provides growth and forecasting estimates for 2019 through 2050, this update was adopted after the 2022 AQMP. Therefore, the analysis below uses assumptions from the 2020-2045 RTP/SCS for consistency with the most recent AQMP.

The Project site has a General Plan land use designation and zoning designation of R-ML and RM-20, respectively. The R-ML General Plan land use designation is intended for residential development with a density of 1.8 dwelling units per acre (du/ac). The RM-20 zoning district is intended to promote the development of multi-family rental and ownership dwelling units up to 20 units per acre.

With a 22.5 percent density bonus, the Project would develop 62 attached townhome residential units on the 2.64-acre site, resulting in a density of 23 du/ac. The proposed Project would qualify for the density bonus by reserving four units for very-low-income households. While the proposed Project’s increased density has not been accounted for in the General Plan, the Project would still be consistent with the 2022 AQMP as described further below.

The 2020-2045 RTP/SCS estimated that between 2016 and 2045, the City of Yorba Linda would increase its population by 2,800 people: from 67,800 persons to 70,600 persons.6 The HEIP PEIR uses a population forecast of 2.94 residents per unit.7 Therefore, with the proposed 62 residential units, the Project would result in a population increase of approximately 182 people. The most recently available population and housing estimates, which incorporate 2020 Census data, estimates that the 2024 population within the City of Yorba Linda had a population of 66,267 people. With implementation of the Project, the City’s population would total 66,449 people. The proposed Project would account for 0.26 percent of the estimated 2045 population and 6.5 percent of the estimated growth between 2020 and 2045. Therefore, the Project would not exceed SCAG’s 2045 growth forecasts. As a result, the proposed Project would be consistent with Criterion 1.

Consistency Criterion No. 2 refers to the California Ambient Air Quality Standards. An impact would occur if the long-term emissions associated with the proposed Project exceed the SCAQMD’s regional significance 6 SCAG. (2020). Current Context Demographics and Growth Forecast. Referenced at:
https://scag.ca.gov/sites/default/files/old/file-attachments/0903fconnectsocal_demographics-and-growthforecast.pdf?1606001579= 7 City of Yorba Linda. (2024). Addendum to the Program Environmental Impact Report for the City of Yorba Linda 2021-2029 Housing Element Implementation Programs. Referenced at: https://www.yorbalindaca.gov/DocumentCenter/View/8032/YLHEAddendum_Public-Review-Draft_2024-05-08-PDF

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thresholds for construction and operational emissions. As presented in Tables 3 through 5, the proposed Project would not result in emitting emissions that exceed SCAQMD-established thresholds with mandatory compliance with Mitigation Measure 4.1-1 from the 2022 Certified PEIR MMRP. Therefore, the proposed Project would be consistent with Criterion No. 2.

As the Project would be consistent with both Criterion No. 1 and 2, impacts related to consistency with the AQMP would be less than significant.

Odors
Odors would be produced during the construction of the proposed Project due to the operation of heavyduty off-road equipment. The primary odor emitted would be diesel particulate matter from the vendor trucks and heavy-duty off-road equipment. This odor may be noticeable by nearby residents; however, these odors would be expected and not necessarily objectionable. These odors would also dissipate quickly and would be temporary. Therefore, due to the nature of the odor produced during construction as temporary and non-objectionable to a substantial number of people, the odor impact from construction of the proposed Project would be less than significant.

For operational odor emissions, SCAQMD’s CEQA Air Quality Handbook describes odor complaints associated with the following land uses:
• Agricultural uses
• Chemical plants
• Composting activities
• Dairies
• Fiberglass molding
• Food processing plants
• Landfills
• Refineries
• Wastewater treatment plants
The Project does not propose any of the above land uses and is required to comply with SCAQMD Rule 402, Nuisance, which states:

A person shall not discharge from any source whatsoever such quantities of air contaminants or other material which cause injury, detriment, nuisance, or annoyance to any considerable number of persons or to the public, or which endanger the comfort, repose, health, or safety of any such persons or the public, or which cause, or have a natural tendency to cause, injury or damage to business or property.

The provisions of this rule shall not apply to odors emanating from agricultural operations necessary for the growing of crops or the raising of fowl or animals.

Thus, impacts associated with odor produced by operation of the proposed Project would be less than significant.

Conclusion
Without mitigation, the proposed Project’s maximum daily regional construction emissions would exceed SCAQMD’s threshold of significance for ROG. However, with mandatory compliance with Mitigation Measure

4.1-1 from the 2022 Certified PEIR MMRP, ROG emissions would not exceed the threshold and construction impacts would be less than significant. The proposed Project's maximum daily regional operational emissions and localized construction emissions would not exceed SCAQMD’s thresholds of significance, as detailed in Tables 4 and 5. All construction and operational activities would comply with the mitigation measures conditioned by the 2022 Certified PEIR MMRP and the applicable SCAQMD rules and regulations, as described above. Additionally, the proposed Project is consistent with SCAQMD’S 2022 AQMP, reflecting adherence to regional air quality management goals and standards. Finally, odors produced during construction would be temporary and not significantly objectionable, and during operation, the proposed

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Project involves land uses that typically do not generate significant odor complaints and would comply with SCAQMD Rule 402. Therefore, the proposed Project would result in less-than-significant air quality impacts.

The HEIP PEIR determined that buildout of its project would result in significant and unavoidable impacts related to construction and operational air quality emissions, for both regional and localized thresholds.

Consequently, the HEIP PEIR project would conflict with the 2022 AQMP. However, impacts related to odors were determined to result in less than significant impact. Since the proposed Project would result in less than significant impacts related to all air quality impact criteria, the proposed Project would not result in any new impacts.

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Energy
The State CEQA Guidelines do not have specific thresholds for energy consumption. Rather, the criteria in Appendix G: VI Energy ask (a) “[Would the proposed Project] Result in potentially significant environmental impact due to wasteful, inefficient, or unnecessary consumption of energy resources during project construction or operation?” or (b) “[Would the project] Conflict with or obstruct a state or local plan for renewable energy or energy efficiency?” 8 Therefore, for the purpose of this analysis, a significant impact would occur if:
(a) The project design and/or location encourages wasteful, inefficient, and unnecessary consumption of energy, especially fossil fuels such as coal, natural gas, and petroleum, as well as the use of fuel by vehicles anticipated to travel to and from the project. (b) The project design impedes the growth of future renewable energy developments.

Southern California Edison and the Southern California Gas Company would provide electricity and natural gas, respectively, for construction and operation of the proposed Project. The following assumptions were used to calculate the energy (electricity, natural gas, and petroleum) consumption of the proposed Project:
• Construction equipment fuel consumption was derived from CARB OffRoad2021 emission model. • Fuel Consumption from vehicle travel was derived from CARB EMFAC2021 emission model. • Electrical and natural gas usage was derived from the CalEEMod model Version 2022.1.

Construction
Electricity and Natural Gas Usage
Due to the Project size and the fact that construction is temporary, the electricity used during construction of the proposed Project would be substantially less than that required for Project operation and would have a negligible contribution to the Project’s overall energy consumption. The electric power used during construction would be for as-necessary lighting and electronic equipment such as computers inside temporary construction trailers. Natural gas is not anticipated to be needed for construction activities. Any consumption of natural gas would be minor and negligible in comparison to the usage during the operation of the proposed Project. Since operation of the Project would result in a nominal increase of Countywide electricity, as described below, construction energy consumption would in turn result in a less-than-significant impact to energy.

Petroleum Fuel Usage
The equipment associated with construction activities (off-road/heavy duty vehicles) would rely on diesel fuel as would vendor and haul trucks involved in delivering building materials and removing soil material from the Project site. Construction workers would travel to and from the Project site throughout the duration of construction, and for a conservative analysis, it is assumed that construction workers would travel in gasoline-powered passenger vehicles. It should be noted that total fuel consumption is a conservative analysis and would likely overstate the amount of fuel usage, as specific construction equipment is not expected to operate during the entire duration of the construction activity (i.e., crane). The trips included worker vehicles, vendor vehicles, and haul vehicles. Table 6, Total Construction Fuel Usage, shows the overall fuel consumption for Project construction, obtained from the CARB OffRoad 2021 emission model and the CARB EMFAC2021 8 California Energy Commission 2023. CEQA Statutes and Guidelines Attachment 10 Appendix G: Environmental Checklist Form.

Referenced at: https://www.energy.ca.gov/sites/default/files/2024-01/11_Attachment_10_- _Appendix_G_from_CEQA_Handbook_ada.docx

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model. Detailed tables of fuel consumption by construction equipment and on-road vehicles can be found in Appendix D.

Table 6: Total Construction Fuel Usage
Source Diesel Fuel (Gallons) Gasoline Fuel (Gallons)
Proposed Project On-Road Construction Vehicles 13,392 15,835 Proposed Project Off-Road Construction Equipment 20,919 - Proposed Project Total Consumption 34,310 15,835
Orange County On-Road Vehicles 227,267,688 447,487,235
Orange County Off-Road Construction Equipment 14,157,699 977,564 On-Road Project Percentage (%) 0.2 0.01
Off-Road Project Percentage (%) 1.6 -
Source: Fuel Calculation Sheets (see Appendix E).

As shown in Table 6, the Project is estimated to consume a total of approximately 34,310 gallons of diesel fuel and approximately 15,835 gallons of gasoline fuel. According to the projected 2026 fuel consumption data obtained from EMFAC2021 for Orange County, on-road vehicles would consume approximately 227,267,688 gallons of diesel fuel and 447,487,235 gallons of gasoline. The data for Orange County can be found in Appendix D. On-road construction vehicles from the proposed Project would account for 0.2 percent of diesel fuel consumption and 0.01 percent gasoline fuel consumption within Orange County in 2026. Off-road consumption within Orange County in 2026 would total approximately 14,157,699 gallons of diesel fuel and 977,564 gallons of gasoline fuel. Off-road construction equipment from the proposed Project would account for 1.6 percent of diesel consumption within Orange County in 2026. As such, Project construction would have a negligible effect on energy supplies within Orange County. Additionally, the Project would be required to comply with regulations implemented to reduce emissions from construction, such as CCR Title 13, Motor Vehicles, Section 2449(d)(3), Idling, which limits idling times of construction vehicles to no more than 5 minutes. Thus, the Project would not result in wasteful, inefficient, or unnecessary consumption of energy. Therefore, the proposed Project would result in less-than-significant energy impacts during construction. No mitigation would be required.

Operation
Operation of the proposed Project would consume electricity and petroleum. No natural gas connections are proposed for Project. Electricity consumption can be found in the CalEEMod Output Sheets attached (Appendix A). The gasoline consumption rates utilize the same assumptions that were used for the worker vehicles. Table 7, Annual Project Operational Energy Consumption, summarizes the Project’s estimated energy consumption. These values would likely overstate the Project’s energy requirements, since this modeling conservatively omits energy-saving features required by Title 24. Thus, the following data does not account for the energy reductions resulting from solar panels.

The most recent data available for electricity usage from the California Energy Commission is from 2023. In 2023, electricity consumption in Orange County was estimated at 18,759,000,000 kilowatt-hours.9 As shown in Table 7, the proposed Project would result in a 0.001 percent increase in electricity consumption within Orange County. As previously shown in Table 6, gasoline consumption in Orange County in 2026 is estimated at 1,114,083,928 gallons (see Appendix D). Therefore, the proposed Project would account for 0.01 percent 9 California Energy Commission. (2023). Electricity Consumption by County. Referenced at:
https://www.energy.ca.gov/data-reports/energy-almanac/california-electricity-data/california-energy-consumptiondashboards-0

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of gasoline fuel consumption in Orange County. Thus, the Project would not result in wasteful, inefficient, or unnecessary consumption of energy. The proposed Project would result in less-than-significant energy impacts during operation. No mitigation would be required.

Table 7: Annual Project Operational Energy Consumption
Electricity (Kilowatt-Hours)
Proposed Project 1,839,497
Orange County (2023) 18,759,000,000
Project Percent Increase (%) 0.001
Petroleum (Gasoline) Consumption (Gallons)
Proposed Project 261,151
Orange County (2026) 1,114,083,928
Project Percent Increase (%) 0.01
Notes: VMT = vehicle miles traveled
Source: CalEEMod Output Sheets (see Appendix A).

Future Renewable Energy Developments
The proposed Project would be required to meet the CCR Title 24 energy efficiency standards in effect during permitting of proposed Project and comply with all applicable City energy codes, as adopted by the City under Municipal Code Section 15.04.010. The City’s administration of the CCR Title 24 requirements includes review of design components and energy conservation measures that occurs during the permitting process, which ensures that all requirements are met. In addition, Project design and operation would comply with State Building Energy Efficiency Standards, appliance efficiency regulations, and green building standards. The Project buildings would install solar in compliance with current Title 24 Part 6 requirements, which would further reduce energy consumption. As such, the Project would not inhibit the use of and would allow for future flexibility relating to renewable energy.

Conclusion
The proposed Project’s energy consumption for construction activities would be conditioned to require compliance with existing fuel standards, machinery efficiency standards, and California Air Resources Board (CARB) requirements that limit idling of construction trucks and equipment. There are no unusual Project characteristics that would cause the use of construction equipment that would be less energy efficient compared with other similar construction sites in other parts of the state. Additionally, through compliance with existing standards, operation of the Project would not result in an energy demand on a per-development basis that is greater than other development projects in Southern California. Additionally, the proposed Project would be required to meet the California Code of Regulations (CCR) Title 24 energy efficiency standards and comply with all applicable City energy codes. The Project buildings would install solar panels in compliance with current Title 24 requirements. Therefore, the Project would not inhibit the use of, and would instead allow, for future flexibility relating to renewable energy. Additionally, the Project would result in a less-than-significant impact related to inefficient, wasteful, or unnecessary consumption of energy. No mitigation would be required.

The HEIP PEIR determined that impacts related to energy consumption would be less than significant, and that its project would not conflict with state or local energy plans. As discussed, the proposed Project would also result in less than significant impacts related to energy consumption. Therefore, the proposed Project would not result in any new energy impacts.

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Greenhouse Gas Emissions
Regulatory Background and Thresholds
California State Executive Order S-3-05, issued by Governor Arnold Schwarzenegger in June 2005, established comprehensive GHG reduction targets for the state. 10 It mandated reducing GHG emissions to 2000 levels by 2010, to 1990 levels by 2020, and to 80% below 1990 levels by 2050. This Executive Order laid the foundation for subsequent climate change mitigation efforts in California, including the development of various policies and programs aimed at reducing emissions across sectors such as transportation, energy, and industry. The objective of the Executive Order is to contribute to capping worldwide CO2 concentrations at 450 parts per million (ppm), stabilizing global climate change.

The SCAQMD convened a GHG Emissions CEQA Significance Threshold Working Group to help lead agencies determine significance thresholds for GHG emissions when the SCAQMD is not the lead agency.

The last working group was held in September 2010 (Meeting No. 15) and proposed a tiered approach (Tier I to Tier V), equivalent to the existing consistency determination requirements in CEQA Guidelines Sections 15064(h)(3) or 15125(d). 11 The applicable screening threshold tiers are described in further detail below.

Tier III – Numerical Screening Thresholds
The SCAQMD’s draft threshold uses the Executive Order S-3-05 goal as the basis for the Tier III screening level. Tier III consists of screening values which the lead agency can choose from, but it must be consistent with all projects within its jurisdiction. A project’s construction emissions are averaged over 30 years and are added to the project’s operational emissions. If a project’s emissions are below one of the following screening thresholds, then the project-level and cumulative-level impacts would be less than significant:
• Option 1, all land use types: 3,000 MTCO2e per year
• Option 2, based on land use type:
o Residential: 3,500 MTCO2e per year
o Commercial: 1,400 MTCO2e per year
o Mixed-use: 3,000 MTCO2e per year
Tier IV – Performance Standards (Sector-based Standard) For development projects that do not meet the Tier 3 screening threshold of 3,000 MTCO2e per year, the SCAQMD has developed Tier 4 thresholds for more detailed evaluation. These thresholds utilize an efficiency metric to analyze GHG emissions, based on GHG emitted per capita. The SCAQMD has adopted efficiencybased thresholds for two target dates: 2020 and 2035. Relative to the 2020 target date, SCAQMD has adopted a project-level Tier 4 threshold of 4.8 MTCO2e per service population (SP). Relative to the 2035 target date, SCAQMD has adopted a project-level Tier 4 threshold of 3.0 MTCO2e per SP.

City Thresholds
Based on the foregoing guidance, the City has elected to rely on compliance with the SCAQMD threshold in the determination of significance of project-related GHG emissions. Specifically, the City has selected the 10 Executive Department State of California. Executive Order S-3-05. Referenced at: https://www.library.ca.gov/wpcontent/uploads/GovernmentPublications/executive-order-proclamation/5129-5130.pdf 11 SCAQMD. (2010). Minutes of the GHG CEQA Significance Threshold Stakeholder Working Group #15. Referenced at:
http://www.aqmd.gov/docs/default-source/ceqa/handbook/greenhouse-gases-(ghg)-ceqa-significance-thresholds/year2008-2009/ghg-meeting-15/ghg-meeting-15-minutes.pdf.

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interim 3,000 MTCO2e per year threshold (Option 1) recommended by SCAQMD staff against which to compare project-related GHG emissions.

The City understands that the 3,000 MTCO2e per year threshold was proposed by the SCAQMD a decade ago and was adopted as an interim policy; however, no permanent, superseding policy or threshold has since been adopted. The 3,000 MTCO2e per year threshold was developed and recommended by SCAQMD, an expert agency, based on substantial evidence as provided in the Draft Guidance Document – Interim CEQA Greenhouse Gas Significance Threshold document and subsequent Working Group meetings (latest of which occurred in 2010). 12 The SCAQMD has not withdrawn its support of the interim threshold and all documentation supporting the interim threshold remains on the SCAQMD website on a page that provides guidance to CEQA practitioners for air quality analysis (and where all SCAQMD significance thresholds for regional and local criteria pollutants and toxic air contaminants also are listed). Further, as stated by the SCAQMD, this threshold “uses the Executive Order S-3-05 goal (80% below 1990 levels by 2050) as the basis for deriving the screening level” and, thus, remains valid for use in year 2025 and for purposes of this analysis. Lastly, this threshold has been used for hundreds of GHG analyses performed for projects located within the SCAQMD jurisdiction.

Due to the large scale of the project, the Yorba Linda HEIP PEIR evaluates impacts using the Tier IV, service population threshold. However, the HEIP PEIR calculated an interpolated threshold since its project horizon year (2045) is beyond the SCAQMD threshold of 3.0 MTCO2e per year for a target year of 2035. First, the 2050 reduction target was determined by calculating the reduction target of 80 percent below 1990 levels by 2050, which equates to 0.96 MTCO2e per year. Then, the service population threshold was interpolated for the Housing Element project’s target year of 2045, which equates to 1.44 MTCO2e per year. Therefore, analysis of the proposed Project will discuss both the Tier III (3,000 MTCO2e per year) and IV (1.44 MTCO2e per capita per year) thresholds.

Project GHG Emissions
The Project’s construction GHG emissions are shown in Table 8, Project Construction GHG Emissions, and the overall construction and operational emissions are shown in Table 9, Total Project GHG Emissions, below.

Operational GHG emissions have accounted for GHG reductions from the increased residential density at 23 du/ac. These emissions were calculated using the CalEEMod model. The construction emissions are amortized over 30 years and added to the operational GHG emissions. As shown in Table 9, the Project’s construction and operation GHG emissions would total 382 MTCO2e per year. Therefore, the Project would not exceed SCAQMD’s Tier III screening threshold.

Table 8: Project Construction GHG Emissions
Construction Year Annual GHG Emissions
(MTCO2e)
Year 1 (2026) 167
Year 2 (2027) 238
Total Emissions 405
Total Emissions Amortized Over 30 Years 13
Source: CalEEMod Output Sheets (see Appendix A).
12 SCAQMD. (2008). Interim CEQA GHG Significance Threshold for Stationary Sources, Rules and Plans. Referenced at:
http://www.aqmd.gov/docs/default-source/ceqa/handbook/greenhouse-gases-(ghg)-ceqa-significancethresholds/ghgboardsynopsis.pdf.

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Table 9: Total Project GHG Emissions
Activity Annual GHG Emissions1
(MTCO2e)
Mobile 310
Area 1
Energy 37
Water 6
Waste 14
Refrigeration <0.1
Gross Project Operation Emissions 368
Project Construction Emissions 13
Total Project Emissions 382
Tier III Significance Threshold 3,000
Threshold Exceeded? No
Note: Numbers have been rounded to whole numbers.
1The GHG emissions provided have accounted for the increased residential density of 23 du/ac.

Source: CalEEMod Output Sheets (see Appendix A).

SCAQMD’s Tier III threshold is a screening metric to determine a project’s GHG impacts. Further evaluation using the Tier IV threshold is only necessary if a project does not meet the Tier III screening threshold.

However, since the HEIP PEIR evaluates impacts based on the Tier IV threshold, the Project’s GHG emissions per capita is provided below.

As previously stated, based on the average household size of 2.94 persons per household in the City, the Project would result in approximately 182 persons. Thus, the proposed Project would result in 2.10 MTCO2e per capita, which exceeds the interpolated 2045 Target threshold of 1.44 MTCO2e per capita.

The proposed Project would be required to implement Mitigation Measure 4.1-2 from the 2022 Certified PEIR MMRP to reduce operational GHG emissions to the extent feasible, as stated below.

Mitigation Measure 4.1-2. …Possible mitigation measures to reduce operational emissions could include, but are not limited to the following:
• Increase in insulation such that heat transfer and thermal bridging is minimized; • Limit air leakage through the structure and/or within the heating and cooling distribution system;
• Use of energy-efficient space heating and cooling equipment; • Installation of electrical hook-ups at loading dock areas; • Installation of dual-paned or other energy efficient windows; • Use of interior and exterior energy efficient lighting that exceeds then incumbent California Title 24 Energy Efficiency performance standards;
• Installation of automatic devices to turn off lights where they are not needed; • Application of a paint and surface color palette that emphasizes light and off-white colors that reflect heat away from buildings;
• Design of buildings with “cool roofs” using products certified by the Cool Roof Rating Council, and/or exposed roof surfaces using light and off-white colors; • Design of buildings to accommodate photo-voltaic solar electricity systems or the installation of photo-voltaic solar electricity systems;

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• Installation of ENERGY STAR-qualified energy-efficient appliances, heating and cooling systems, office equipment, and/or lighting products.
• Landscaping palette emphasizing drought tolerant plants; • Use of water-efficient irrigation techniques;
• U.S. EPA Certified WaterSense labeled or equivalent faucets, high-efficiency toilets (HETs), and water-conserving shower heads.
• Applicants for residential within 1,000 feet of a major sources of TACs (e.g., warehouses, industrial areas, freeways, roadways, and rail lines with traffic volumes over 10,000 vehicle per day), as measured from the property line of the project to the property line of the source/edge of the nearest travel lane, shall submit a health risk assessment (HRA) to the City of Yorba Linda prior to future
• discretionary Project approval. The HRA shall be prepared in accordance with policies and procedures of CEQA and the South Coast AQMD. If the HRA shows that the incremental cancer risk exceeds ten in one million (10E-06), PM10 concentrations exceed 2.5 microgram per cubic meter (μg/m3), PM2.5 concentrations exceed 2.5 μg/m3, or the appropriate noncancer hazard index exceeds 1.0, the applicant will be required to identify and demonstrate that mitigation measures are capable of reducing potential cancer and noncancer risks to an acceptable level (i.e., below ten in one million or a hazard index of 1.0), including appropriate enforcement mechanisms. Measures to reduce risk may include but are not limited to:
o Air intakes located away from high volume roadways and/or truck loading zones. o Heating, ventilation, and air conditioning systems of the buildings provided with appropriately sized maximum efficiency rating value (MERV) filters (e.g., MERV 13 or better).

The applicant would implement the following measures: 1) limiting air leakage through HVAC systems, 2) installing energy efficient windows, 3) meeting Title 24 lighting standards, 4) implementing cool roofs, 5) installing of photo-voltaic solar energy systems, 6) installing ENERGY STAR-qualified appliances, 7) using drought tolerant plants, 8) using water-efficient irrigation techniques, and 9) providing the option for automatic lighting.

Despite the GHG reductions that would result from implementation of Mitigation Measure 4.1-2, approximately 84 percent of the Project’s operational GHG emissions are from mobile source emissions, such as residential vehicles traveling to and from the Project site. While there are some GHG reductions in mobile source emissions due to the increased residential density, there are no feasible mitigation measures available to further reduce the Project’s emissions. Therefore, the Project would have significant and unavoidable impacts to GHG emissions, consistent with the findings of the HEIP PEIR. The Project’s emissions per capita are summarized below in Table 10, Project GHG Emissions Per Capita.

Table 1010: Project GHG Emissions Per Capita
Activity Annual GHG Emissions (MTCO2e)
Total Project Emissions 382
Service Population 182
Project-Generated GHG per Service Population 2.10
Interpolated 2045 Significance Threshold 1.44
Tier IV Threshold Exceeded? Yes

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Project Consistency with Plans, Policies, and Regulations CARB 2022 Scoping Plan
CARB’s 2022 Scoping Plan for Achieving Carbon Neutrality13 (2022 Scoping Plan) sets California’s GHG emission reduction target for 2045 at 85% below 1990 levels, which was codified by SB 32. As shown below in Table 10, 2022 Scoping Plan Consistency Summary, the Project would comply with all applicable plans and programs intended to reduce GHG emissions. The proposed Project would not conflict with any plan, policy, or regulation adopted for the purpose of reducing the emissions of GHGs within 2022 Scoping Plan14. The following table also includes policies from Appendix D of the Scoping Plan, which provide GHG reduction policies for local governments to implement. The local action policies are focused on climate action planning and approval of new land use development projects.

Table 11: 2022 Scoping Plan Consistency Summary
Action Consistency
GHG Emissions Reductions Relative to the SB 32 Target
40% Below 1990 levels by 2030. Consistent. The Project would comply with Title 24 Part 6 building energy requirements along with other local and State initiatives that aim to achieve the 40% below 1990 levels by 2030 goal.

Smart Growth/Vehicle Miles Traveled VMT
VMT per capita reduced 25% below 2019 levels by
2030, and 30% below 2019 levels by 2045.

Consistent. The Project proposes the development of highdensity residentials which would include 4 units designated for very-low-income households. This reservation for
affordable units qualifies the Project for a 22.5 percent density bonus. As previously discussed in the air quality section, the Project would be consistent with the growth assumptions in the 2020 Connect SoCal, so the Project
would not interfere with the analysis completed for the Connect SoCal report outlining VMT reduction targets and measures.

Light-Duty Vehicle (LDV) Zero-Emission Vehicles (ZEVs)
100% of LDV sales are ZEV by 2035. Consistent. The proposed Project would be designed and constructed in accordance with Title 24 Part 6 and Part 11 requirements, which includes constructing homes to allow for electric vehicle charging.

New Residential and Commercial Buildings
All electric appliances beginning 2026 (residential)
and 2029 (commercial), contributing to 6 million heat
pumps installed statewide by 2030.

Consistent. The Project would comply with Title 24 Part 6 building energy requirements, which would require all inunit appliances for residential projects to be all-electric and Energy Star certified.

Construction Equipment
25% of energy demand electrified by 2030 and 75%
electrified by 2045.

Consistent. The proposed Project would be required to use construction equipment that is registered by CARB and meet CARB’s standards. CARB sets its standards to be in line with the goal of reducing energy demand by 25% in 2030 and
75% in 2045.
13 California Air Resources Board. (2022). California’s 2022 Climate Change Scoping Plan Table 2-1: Actions for the Scoping Plan Scenario: AB 32 GHG Inventory Sectors. Referenced at: https://ww2.arb.ca.gov/sites/default/files/2023-04/2022-sp.pdf 14 California Air Resources Board. (2022). California’s 2022 Climate Change Scoping Plan Appendix D Local Actions. Referenced at: https://ww2.arb.ca.gov/sites/default/files/2022-05/2022-draft-sp-appendix-d-local-actions_0.pdf

19081 Yorba Linda Boulevard Residential Project
21 Air Quality, Energy, and GHG Impact Analysis
Action Consistency
Transportation Electrification
Create a jurisdiction-specific ZEV ecosystem to support deployment of ZEVs statewide (such as permit
streamlining, infrastructure siting, consumer education, or preferential parking policies).

Consistent. The proposed Project would be designed and
constructed in accordance with Title 24 Part 6 and Part 11 requirements, which includes constructing homes to allow for electric vehicle charging. Therefore, the proposed Project would not interfere with the implementation of a ZEV
ecosystem within the City.

Local Action Policies - VMT Reduction
Adopt and implement Complete Streets policies and
investments, consistent with general plan circulation
element requirements.

Consistent. The Project proposes the replacement of the sidewalk along the Project frontage. The existing sidewalk condition would be improved and the Project would not
interfere with the implementation of Complete Streets in the City.

Increase public access to shared clean mobility options (such as planning for and investing in electric shuttles, bike share, car share, transit).

Consistent. The Project site is located in a developed urban area with sidewalks available along all nearby roadways.

The proposed on-site roadway system includes walkways
throughout the Project site that would connect to the off-site sidewalks. In addition, the proposed residential units would allow for charging of electric vehicles. The nearest bus stop from the existing Project driveway is the Lakeview-Yorba Linda stop, located approximately 0.7 miles west.

Amend zoning or development codes to enable mixeduse, walkable, and compact infill development (such as increasing allowable density of the neighborhood).

Consistent. While the Project does not require a zoning amendment, it would develop a high density residential
community. The Project proposes to allot 4 units, or 6
percent of the base density, for very-low-income
households.

Local Action Policies - Building Decarbonization
Adopt all-electric new construction reach codes. Consistent. The proposed Project would comply with Title 24 Parts 6 and 11, which includes electric heat pumps
installed during construction and electric hookups for all appliances.

Adopt policies and incentive programs to reduce
electrical loads from equipment plugged into outlets
(such as purchasing Energy Star equipment for
municipal buildings, occupancy sensors, smart power
strips, equipment controllers, etc.).

Consistent. The proposed Project would be constructed in accordance with Title 24 CALGreen requirements, which
includes installation of Energy Star equipment and
appliances in new buildings.

Facilitate deployment of renewable energy
production and distribution and energy storage.

Consistent. The proposed Project would be constructed in accordance with the California Energy Code (Title 24 Part 6) to meet all requirements related to solar energy
production and the CALGreen Building Energy Efficiency
Standards (Title 24 Part 11) to meet efficiency standards.

Source: California Air Resources Board. (2022). California’s 2022 Climate Change Scoping Plan Table 2-1: Actions for the Scoping Plan Scenario: AB 32 GHG Inventory Sectors. Referenced at: https://ww2.arb.ca.gov/sites/default/files/2023-04/2022-sp.pdf SCAG Connect SoCal 2024
In addition, on April 4, 2024, SCAG’s Regional Council adopted Connect SoCal 2024, the 2024-2050 Regional Transportation Plan/Sustainable Communities Strategy, which includes long-range regional transportation plans, regional transportation improvement programs, regional housing needs allocations, and other plans for the region. SCAG’s Connect SoCal 2024 policies focus largely on regional transportation and the efficiency of transportation, which are implemented by counties and cities within the SCAG region, as part of the overall planning and maintenance of the regional transportation system. However, these

19081 Yorba Linda Boulevard Residential Project
22 Air Quality, Energy, and GHG Impact Analysis
strategies are also intended to reduce GHG emissions from passenger vehicles. As an individual development, the policies are not directly applicable to the Project. However, the proposed Project would not interfere with the implementation of these policies, since the Project would develop a high density residential project pursuant to the current Title 24 standards.

Conclusion
As described above, the proposed Project’s construction and operational GHG emissions would total 382 MTCO2e, which would not exceed the SCAQMD’s screening Tier III threshold of 3,000 MTCO2e per year.

However, the proposed Project would result in annual emissions of 2.10 MTCO2e per capita, which exceeds the 1.44 MTCO2e per capita threshold determined by the HEIP PEIR. The project would incorporate MM 4.1- 2 which would reduce emissions to the extent feasible. This is consistent with the findings of the HEIP PEIR, which found GHG emissions would be significant and unavoidable. Therefore, the Project would not result in any new impacts related to GHG emissions.

Additionally, the Project would be consistent with the actions and measures of CARB’s 2022 Scoping Plan and SCAG Connect SoCal 2024 and would not interfere with the policies and goals set within those plans.

Therefore, the Project would have a less-than-significant impact related to conflict with plans related to reducing GHG emissions.

19081 Yorba Linda Boulevard Residential Project
23 Air Quality, Energy, and GHG Impact Analysis
Figure 1: Project Site Aerial

19081 Yorba Linda Boulevard Residential Project
24 Air Quality, Energy, and GHG Impact Analysis
Figure 2: Conceptual Site Plan
Source: MVE + Partners. (2025).

19081 Yorba Linda Boulevard Residential Project
25 Air Quality, Energy, and GHG Impact Analysis
Figure 3: Sensitive Receptor Location

19081 Yorba Linda Boulevard Residential Project
Air Quality, Energy, and GHG Impact Analysis
Appendix A: CalEEMod Output Sheets

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25-062 19081 Yorba Linda Blvd Detailed Report
Table of Contents

1. Basic Project Information

1.1. Basic Project Information

1.2. Land Use Types

1.3. User-Selected Emission Reduction Measures by Emissions Sector

2. Emissions Summary

2.1. Construction Emissions Compared Against Thresholds

2.2. Construction Emissions by Year, Unmitigated

2.3. Construction Emissions by Year, Mitigated

2.4. Operations Emissions Compared Against Thresholds

2.5. Operations Emissions by Sector, Unmitigated

2.6. Operations Emissions by Sector, Mitigated

3. Construction Emissions Details

3.1. Demolition (2026) - Unmitigated

3.2. Demolition (2026) - Mitigated

3.3. Site Preparation (2026) - Unmitigated

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3.4. Site Preparation (2026) - Mitigated

3.5. Grading (2026) - Unmitigated

3.6. Grading (2026) - Mitigated

3.7. Building Construction (2026) - Unmitigated

3.8. Building Construction (2026) - Mitigated

3.9. Building Construction (2027) - Unmitigated

3.10. Building Construction (2027) - Mitigated

3.11. Paving (2027) - Unmitigated

3.12. Paving (2027) - Mitigated

3.13. Architectural Coating (2027) - Unmitigated

3.14. Architectural Coating (2027) - Mitigated

4. Operations Emissions Details

4.1. Mobile Emissions by Land Use

4.1.1. Unmitigated

4.1.2. Mitigated

4.2. Energy

4.2.1. Electricity Emissions By Land Use - Unmitigated

4.2.2. Electricity Emissions By Land Use - Mitigated

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4.2.3. Natural Gas Emissions By Land Use - Unmitigated

4.2.4. Natural Gas Emissions By Land Use - Mitigated

4.3. Area Emissions by Source

4.3.1. Unmitigated

4.3.2. Mitigated

4.4. Water Emissions by Land Use

4.4.1. Unmitigated

4.4.2. Mitigated

4.5. Waste Emissions by Land Use

4.5.1. Unmitigated

4.5.2. Mitigated

4.6. Refrigerant Emissions by Land Use

4.6.1. Unmitigated

4.6.2. Mitigated

4.7. Offroad Emissions By Equipment Type

4.7.1. Unmitigated

4.7.2. Mitigated

4.8. Stationary Emissions By Equipment Type

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4.8.1. Unmitigated

4.8.2. Mitigated

4.9. User Defined Emissions By Equipment Type

4.9.1. Unmitigated

4.9.2. Mitigated

4.10. Soil Carbon Accumulation By Vegetation Type

4.10.1. Soil Carbon Accumulation By Vegetation Type - Unmitigated

4.10.2. Above and Belowground Carbon Accumulation by Land Use Type - Unmitigated

4.10.3. Avoided and Sequestered Emissions by Species - Unmitigated

4.10.4. Soil Carbon Accumulation By Vegetation Type - Mitigated

4.10.5. Above and Belowground Carbon Accumulation by Land Use Type - Mitigated

4.10.6. Avoided and Sequestered Emissions by Species - Mitigated

5. Activity Data

5.1. Construction Schedule

5.2. Off-Road Equipment

5.2.1. Unmitigated

5.2.2. Mitigated

5.3. Construction Vehicles

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5.3.1. Unmitigated

5.3.2. Mitigated

5.4. Vehicles

5.4.1. Construction Vehicle Control Strategies

5.5. Architectural Coatings

5.6. Dust Mitigation

5.6.1. Construction Earthmoving Activities

5.6.2. Construction Earthmoving Control Strategies

5.7. Construction Paving

5.8. Construction Electricity Consumption and Emissions Factors

5.9. Operational Mobile Sources

5.9.1. Unmitigated

5.9.2. Mitigated

5.10. Operational Area Sources

5.10.1. Hearths

5.10.1.1. Unmitigated

5.10.1.2. Mitigated

5.10.2. Architectural Coatings

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5.10.3. Landscape Equipment

5.10.4. Landscape Equipment - Mitigated

5.11. Operational Energy Consumption

5.11.1. Unmitigated

5.11.2. Mitigated

5.12. Operational Water and Wastewater Consumption

5.12.1. Unmitigated

5.12.2. Mitigated

5.13. Operational Waste Generation

5.13.1. Unmitigated

5.13.2. Mitigated

5.14. Operational Refrigeration and Air Conditioning Equipment

5.14.1. Unmitigated

5.14.2. Mitigated

5.15. Operational Off-Road Equipment

5.15.1. Unmitigated

5.15.2. Mitigated

5.16. Stationary Sources

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5.16.1. Emergency Generators and Fire Pumps

5.16.2. Process Boilers

5.17. User Defined

5.18. Vegetation

5.18.1. Land Use Change

5.18.1.1. Unmitigated

5.18.1.2. Mitigated

5.18.1. Biomass Cover Type

5.18.1.1. Unmitigated

5.18.1.2. Mitigated

5.18.2. Sequestration

5.18.2.1. Unmitigated

5.18.2.2. Mitigated

6. Climate Risk Detailed Report

6.1. Climate Risk Summary

6.2. Initial Climate Risk Scores

6.3. Adjusted Climate Risk Scores

6.4. Climate Risk Reduction Measures

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7. Health and Equity Details

7.1. CalEnviroScreen 4.0 Scores

7.2. Healthy Places Index Scores

7.3. Overall Health & Equity Scores

7.4. Health & Equity Measures

7.5. Evaluation Scorecard

7.6. Health & Equity Custom Measures

8. User Changes to Default Data

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1. Basic Project Information

1.1. Basic Project Information
Data Field Value
Project Name 25-062 19081 Yorba Linda Blvd
Construction Start Date 9/1/2026
Operational Year 2027
Lead Agency —
Land Use Scale Project/site
Analysis Level for Defaults County
Windspeed (m/s) 1.80
Precipitation (days) 21.2
Location 33.89004314067812, -117.80086903171299
County Orange
City Yorba Linda
Air District South Coast AQMD
Air Basin South Coast
TAZ 5786
EDFZ 7
Electric Utility Southern California Edison
Gas Utility Southern California Gas
App Version 2022.1.1.29

1.2. Land Use Types
Land Use Subtype Size Unit Lot Acreage Building Area (sq ft) Landscape Area (sq ft)
Special Landscape
Area (sq ft)
Population Description
Apartments High
Rise

62.0 Dwelling Unit 1.55 167,745 21,794 — 185 —

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Parking Lot 13.0 Space 0.12 0.00 0.00 — — —
Other Asphalt
Surfaces

0.98 Acre 0.98 0.00 0.00 — — —

1.3. User-Selected Emission Reduction Measures by Emissions Sector Sector # Measure Title
Construction C-13 Use Low-VOC Paints for Construction
Transportation T-1 Increase Residential Density

2. Emissions Summary

2.1. Construction Emissions Compared Against Thresholds Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Un/Mit. ROG NOx CO SO2 PM10T PM2.5T CO2e
Daily, Summer (Max) — — — — — — —
Unmit. 106 14.2 15.8 0.03 2.19 0.78 3,723
Mit. 22.5 14.2 15.8 0.03 2.19 0.78 3,723
% Reduced 79% — — — — — —
Daily, Winter (Max) — — — — — — —
Unmit. 2.03 33.8 23.8 0.12 7.14 3.00 18,037
Mit. 2.03 33.8 23.8 0.12 7.14 3.00 18,037
% Reduced — — — — — — —
Average Daily (Max) — — — — — — —
Unmit. 3.53 4.90 6.83 0.01 0.45 0.22 1,439
Mit. 1.23 4.90 6.83 0.01 0.45 0.22 1,439
% Reduced 65% — — — — — —
Annual (Max) — — — — — — —
Unmit. 0.64 0.89 1.25 < 0.005 0.08 0.04 238 Page 1658 of 2028 25-062 19081 Yorba Linda Blvd Detailed Report, 7/18/2025 11 / 68
Mit. 0.22 0.89 1.25 < 0.005 0.08 0.04 238
% Reduced 65% — — — — — —
Exceeds (Daily Max) — — — — — — —
Threshold 75.0 100 550 150 150 55.0 —
Unmit. Yes No No No No No —
Mit. No No No No No No —
Exceeds (Average
Daily)
— — — — — — —
Threshold 75.0 100 550 150 150 55.0 —
Unmit. No No No No No No —
Mit. No No No No No No —

2.2. Construction Emissions by Year, Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Year ROG NOx CO SO2 PM10T PM2.5T CO2e
Daily - Summer (Max) — — — — — — —
2026 1.51 14.2 15.8 0.03 2.19 0.78 3,723
2027 106 10.4 14.7 0.03 0.98 0.46 3,112
Daily - Winter (Max) — — — — — — —
2026 2.03 33.8 23.8 0.12 7.14 3.00 18,037
2027 1.30 10.4 14.4 0.03 0.98 0.46 3,083
Average Daily — — — — — — —
2026 0.34 3.13 3.64 0.01 0.40 0.17 1,007
2027 3.53 4.90 6.83 0.01 0.45 0.22 1,439
Annual — — — — — — —
2026 0.06 0.57 0.67 < 0.005 0.07 0.03 167
2027 0.64 0.89 1.25 < 0.005 0.08 0.04 238

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2.3. Construction Emissions by Year, Mitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Year ROG NOx CO SO2 PM10T PM2.5T CO2e
Daily - Summer (Max) — — — — — — —
2026 1.51 14.2 15.8 0.03 2.19 0.78 3,723
2027 22.5 10.4 14.7 0.03 0.98 0.46 3,112
Daily - Winter (Max) — — — — — — —
2026 2.03 33.8 23.8 0.12 7.14 3.00 18,037
2027 1.30 10.4 14.4 0.03 0.98 0.46 3,083
Average Daily — — — — — — —
2026 0.34 3.13 3.64 0.01 0.40 0.17 1,007
2027 1.23 4.90 6.83 0.01 0.45 0.22 1,439
Annual — — — — — — —
2026 0.06 0.57 0.67 < 0.005 0.07 0.03 167
2027 0.22 0.89 1.25 < 0.005 0.08 0.04 238

2.4. Operations Emissions Compared Against Thresholds
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Un/Mit. ROG NOx CO SO2 PM10T PM2.5T CO2e
Daily, Summer (Max) — — — — — — —
Unmit. 5.48 0.98 14.6 0.03 2.90 0.75 3,441
Mit. 5.09 0.69 11.3 0.02 2.03 0.52 2,515
% Reduced 7% 29% 23% 30% 30% 30% 27%
Daily, Winter (Max) — — — — — — —
Unmit. 5.16 1.02 10.3 0.03 2.90 0.75 3,308
Mit. 4.77 0.72 7.22 0.02 2.03 0.52 2,419
% Reduced 7% 30% 30% 30% 30% 30% 27%

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Average Daily (Max) — — — — — — —
Unmit. 5.22 0.95 11.8 0.03 2.55 0.66 3,027
Mit. 4.89 0.67 9.01 0.02 1.79 0.46 2,225
% Reduced 6% 29% 24% 30% 30% 30% 27%
Annual (Max) — — — — — — —
Unmit. 0.95 0.17 2.16 < 0.005 0.47 0.12 501
Mit. 0.89 0.12 1.65 < 0.005 0.33 0.08 368
% Reduced 6% 29% 24% 30% 30% 30% 27%
Exceeds (Daily Max) — — — — — — —
Threshold 55.0 55.0 550 150 150 55.0 —
Unmit. No No No No No No —
Mit. No No No No No No —
Exceeds (Average
Daily)
— — — — — — —
Threshold 55.0 55.0 550 150 150 55.0 —
Unmit. No No No No No No —
Mit. No No No No No No —
Exceeds (Annual) — — — — — — —
Threshold — — — — — — 3,000
Unmit. — — — — — — No
Mit. — — — — — — No

2.5. Operations Emissions by Sector, Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Sector ROG NOx CO SO2 PM10T PM2.5T CO2e
Daily, Summer (Max) — — — — — — —
Mobile 1.28 0.94 11.1 0.03 2.90 0.75 3,087
Area 4.19 0.03 3.52 < 0.005 < 0.005 < 0.005 9.44

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Energy 0.00 0.00 0.00 0.00 0.00 0.00 221
Water — — — — — — 36.0
Waste — — — — — — 86.6
Refrig. — — — — — — 1.20
Total 5.48 0.98 14.6 0.03 2.90 0.75 3,441
Daily, Winter (Max) — — — — — — —
Mobile 1.27 1.02 10.3 0.03 2.90 0.75 2,963
Area 3.88 0.00 0.00 0.00 0.00 0.00 0.00
Energy 0.00 0.00 0.00 0.00 0.00 0.00 221
Water — — — — — — 36.0
Waste — — — — — — 86.6
Refrig. — — — — — — 1.20
Total 5.16 1.02 10.3 0.03 2.90 0.75 3,308
Average Daily — — — — — — —
Mobile 1.13 0.92 9.43 0.03 2.55 0.66 2,676
Area 4.10 0.02 2.41 < 0.005 < 0.005 < 0.005 6.46
Energy 0.00 0.00 0.00 0.00 0.00 0.00 221
Water — — — — — — 36.0
Waste — — — — — — 86.6
Refrig. — — — — — — 1.20
Total 5.22 0.95 11.8 0.03 2.55 0.66 3,027
Annual — — — — — — —
Mobile 0.21 0.17 1.72 < 0.005 0.47 0.12 443
Area 0.75 < 0.005 0.44 < 0.005 < 0.005 < 0.005 1.07
Energy 0.00 0.00 0.00 0.00 0.00 0.00 36.6
Water — — — — — — 5.96
Waste — — — — — — 14.3
Refrig. — — — — — — 0.20

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Total 0.95 0.17 2.16 < 0.005 0.47 0.12 501

2.6. Operations Emissions by Sector, Mitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Sector ROG NOx CO SO2 PM10T PM2.5T CO2e
Daily, Summer (Max) — — — — — — —
Mobile 0.90 0.66 7.79 0.02 2.03 0.52 2,161
Area 4.19 0.03 3.52 < 0.005 < 0.005 < 0.005 9.44
Energy 0.00 0.00 0.00 0.00 0.00 0.00 221
Water — — — — — — 36.0
Waste — — — — — — 86.6
Refrig. — — — — — — 1.20
Total 5.09 0.69 11.3 0.02 2.03 0.52 2,515
Daily, Winter (Max) — — — — — — —
Mobile 0.89 0.72 7.22 0.02 2.03 0.52 2,074
Area 3.88 0.00 0.00 0.00 0.00 0.00 0.00
Energy 0.00 0.00 0.00 0.00 0.00 0.00 221
Water — — — — — — 36.0
Waste — — — — — — 86.6
Refrig. — — — — — — 1.20
Total 4.77 0.72 7.22 0.02 2.03 0.52 2,419
Average Daily — — — — — — —
Mobile 0.79 0.65 6.60 0.02 1.78 0.46 1,873
Area 4.10 0.02 2.41 < 0.005 < 0.005 < 0.005 6.46
Energy 0.00 0.00 0.00 0.00 0.00 0.00 221
Water — — — — — — 36.0
Waste — — — — — — 86.6
Refrig. — — — — — — 1.20 Page 1663 of 2028
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Total 4.89 0.67 9.01 0.02 1.79 0.46 2,225
Annual — — — — — — —
Mobile 0.14 0.12 1.21 < 0.005 0.33 0.08 310
Area 0.75 < 0.005 0.44 < 0.005 < 0.005 < 0.005 1.07
Energy 0.00 0.00 0.00 0.00 0.00 0.00 36.6
Water — — — — — — 5.96
Waste — — — — — — 14.3
Refrig. — — — — — — 0.20
Total 0.89 0.12 1.65 < 0.005 0.33 0.08 368

3. Construction Emissions Details

3.1. Demolition (2026) - Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Location ROG NOx CO SO2 PM10T PM2.5T CO2e
Onsite — — — — — — —
Daily, Summer (Max) — — — — — — —
Off-Road Equipment 1.39 12.9 14.6 0.02 0.51 0.47 2,503
Demolition — — — — 1.24 0.19 —
Onsite truck 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Daily, Winter (Max) — — — — — — —
Average Daily — — — — — — —
Off-Road Equipment 0.08 0.71 0.80 < 0.005 0.03 0.03 137 Demolition — — — — 0.07 0.01 —
Onsite truck 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Annual — — — — — — —
Off-Road Equipment 0.01 0.13 0.15 < 0.005 0.01 < 0.005 22.7 Demolition — — — — 0.01 < 0.005 —

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Onsite truck 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Offsite — — — — — — —
Daily, Summer (Max) — — — — — — —
Worker 0.04 0.04 0.66 0.00 0.16 0.04 165
Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hauling 0.02 1.20 0.53 0.01 0.28 0.09 1,055
Daily, Winter (Max) — — — — — — —
Average Daily — — — — — — —
Worker < 0.005 < 0.005 0.03 0.00 0.01 < 0.005 8.72
Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hauling < 0.005 0.07 0.03 < 0.005 0.02 < 0.005 57.8
Annual — — — — — — —
Worker < 0.005 < 0.005 0.01 0.00 < 0.005 < 0.005 1.44
Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hauling < 0.005 0.01 0.01 < 0.005 < 0.005 < 0.005 9.56

3.2. Demolition (2026) - Mitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Location ROG NOx CO SO2 PM10T PM2.5T CO2e
Onsite — — — — — — —
Daily, Summer (Max) — — — — — — —
Off-Road Equipment 1.39 12.9 14.6 0.02 0.51 0.47 2,503
Demolition — — — — 1.24 0.19 —
Onsite truck 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Daily, Winter (Max) — — — — — — —
Average Daily — — — — — — —
Off-Road Equipment 0.08 0.71 0.80 < 0.005 0.03 0.03 137 Demolition — — — — 0.07 0.01 —

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Onsite truck 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Annual — — — — — — —
Off-Road Equipment 0.01 0.13 0.15 < 0.005 0.01 < 0.005 22.7 Demolition — — — — 0.01 < 0.005 —
Onsite truck 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Offsite — — — — — — —
Daily, Summer (Max) — — — — — — —
Worker 0.04 0.04 0.66 0.00 0.16 0.04 165
Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hauling 0.02 1.20 0.53 0.01 0.28 0.09 1,055
Daily, Winter (Max) — — — — — — —
Average Daily — — — — — — —
Worker < 0.005 < 0.005 0.03 0.00 0.01 < 0.005 8.72
Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hauling < 0.005 0.07 0.03 < 0.005 0.02 < 0.005 57.8
Annual — — — — — — —
Worker < 0.005 < 0.005 0.01 0.00 < 0.005 < 0.005 1.44
Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hauling < 0.005 0.01 0.01 < 0.005 < 0.005 < 0.005 9.56

3.3. Site Preparation (2026) - Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Location ROG NOx CO SO2 PM10T PM2.5T CO2e
Onsite — — — — — — —
Daily, Summer (Max) — — — — — — —
Off-Road Equipment 1.48 13.0 13.7 0.03 0.65 0.60 3,142
Dust From Material
Movement
— — — — 0.55 0.06 —

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Onsite truck 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Daily, Winter (Max) — — — — — — —
Off-Road Equipment 1.48 13.0 13.7 0.03 0.65 0.60 3,142
Dust From Material
Movement
— — — — 0.55 0.06 —
Onsite truck 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Average Daily — — — — — — —
Off-Road Equipment 0.01 0.11 0.11 < 0.005 0.01 < 0.005 25.8 Dust From Material
Movement
— — — — < 0.005 < 0.005 —
Onsite truck 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Annual — — — — — — —
Off-Road Equipment < 0.005 0.02 0.02 < 0.005 < 0.005 < 0.005 4.28 Dust From Material
Movement
— — — — < 0.005 < 0.005 —
Onsite truck 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Offsite — — — — — — —
Daily, Summer (Max) — — — — — — —
Worker 0.03 0.03 0.53 0.00 0.13 0.03 132
Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Daily, Winter (Max) — — — — — — —
Worker 0.03 0.03 0.45 0.00 0.13 0.03 125
Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Average Daily — — — — — — —
Worker < 0.005 < 0.005 < 0.005 0.00 < 0.005 < 0.005 1.05 Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00

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Annual — — — — — — —
Worker < 0.005 < 0.005 < 0.005 0.00 < 0.005 < 0.005 0.17 Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00

3.4. Site Preparation (2026) - Mitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Location ROG NOx CO SO2 PM10T PM2.5T CO2e
Onsite — — — — — — —
Daily, Summer (Max) — — — — — — —
Off-Road Equipment 1.48 13.0 13.7 0.03 0.65 0.60 3,142
Dust From Material
Movement
— — — — 0.55 0.06 —
Onsite truck 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Daily, Winter (Max) — — — — — — —
Off-Road Equipment 1.48 13.0 13.7 0.03 0.65 0.60 3,142
Dust From Material
Movement
— — — — 0.55 0.06 —
Onsite truck 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Average Daily — — — — — — —
Off-Road Equipment 0.01 0.11 0.11 < 0.005 0.01 < 0.005 25.8 Dust From Material
Movement
— — — — < 0.005 < 0.005 —
Onsite truck 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Annual — — — — — — —
Off-Road Equipment < 0.005 0.02 0.02 < 0.005 < 0.005 < 0.005 4.28 Dust From Material
Movement
— — — — < 0.005 < 0.005 —
Onsite truck 0.00 0.00 0.00 0.00 0.00 0.00 0.00

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Offsite — — — — — — —
Daily, Summer (Max) — — — — — — —
Worker 0.03 0.03 0.53 0.00 0.13 0.03 132
Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Daily, Winter (Max) — — — — — — —
Worker 0.03 0.03 0.45 0.00 0.13 0.03 125
Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Average Daily — — — — — — —
Worker < 0.005 < 0.005 < 0.005 0.00 < 0.005 < 0.005 1.05 Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Annual — — — — — — —
Worker < 0.005 < 0.005 < 0.005 0.00 < 0.005 < 0.005 0.17 Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00

3.5. Grading (2026) - Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Location ROG NOx CO SO2 PM10T PM2.5T CO2e
Onsite — — — — — — —
Daily, Summer (Max) — — — — — — —
Daily, Winter (Max) — — — — — — —
Off-Road Equipment 1.79 15.8 15.6 0.02 0.85 0.78 2,654
Dust From Material
Movement
— — — — 2.13 0.92 —
Onsite truck 0.00 0.00 0.00 0.00 0.00 0.00 0.00

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Average Daily — — — — — — —
Off-Road Equipment 0.03 0.26 0.26 < 0.005 0.01 0.01 43.6 Dust From Material
Movement
— — — — 0.04 0.02 —
Onsite truck 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Annual — — — — — — —
Off-Road Equipment 0.01 0.05 0.05 < 0.005 < 0.005 < 0.005 7.22 Dust From Material
Movement
— — — — 0.01 < 0.005 —
Onsite truck 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Offsite — — — — — — —
Daily, Summer (Max) — — — — — — —
Daily, Winter (Max) — — — — — — —
Worker 0.03 0.03 0.45 0.00 0.13 0.03 125
Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hauling 0.21 18.0 7.75 0.10 4.03 1.26 15,258
Average Daily — — — — — — —
Worker < 0.005 < 0.005 0.01 0.00 < 0.005 < 0.005 2.09
Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hauling < 0.005 0.30 0.13 < 0.005 0.07 0.02 251
Annual — — — — — — —
Worker < 0.005 < 0.005 < 0.005 0.00 < 0.005 < 0.005 0.35 Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hauling < 0.005 0.05 0.02 < 0.005 0.01 < 0.005 41.6

3.6. Grading (2026) - Mitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Location ROG NOx CO SO2 PM10T PM2.5T CO2e
Onsite — — — Page 1670 of 2028 — — — —
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Daily, Summer (Max) — — — — — — —
Daily, Winter (Max) — — — — — — —
Off-Road Equipment 1.79 15.8 15.6 0.02 0.85 0.78 2,654
Dust From Material
Movement
— — — — 2.13 0.92 —
Onsite truck 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Average Daily — — — — — — —
Off-Road Equipment 0.03 0.26 0.26 < 0.005 0.01 0.01 43.6 Dust From Material
Movement
— — — — 0.04 0.02 —
Onsite truck 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Annual — — — — — — —
Off-Road Equipment 0.01 0.05 0.05 < 0.005 < 0.005 < 0.005 7.22 Dust From Material
Movement
— — — — 0.01 < 0.005 —
Onsite truck 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Offsite — — — — — — —
Daily, Summer (Max) — — — — — — —
Daily, Winter (Max) — — — — — — —
Worker 0.03 0.03 0.45 0.00 0.13 0.03 125
Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hauling 0.21 18.0 7.75 0.10 4.03 1.26 15,258
Average Daily — — — — — — —
Worker < 0.005 < 0.005 0.01 0.00 < 0.005 < 0.005 2.09
Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hauling < 0.005 0.30 0.13 < 0.005 0.07 0.02 251
Annual — — — — — — —
Worker < 0.005 < 0.005 < 0.005 0.00 < 0.005 < 0.005 0.35 Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00

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Hauling < 0.005 0.05 0.02 < 0.005 0.01 < 0.005 41.6

3.7. Building Construction (2026) - Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Location ROG NOx CO SO2 PM10T PM2.5T CO2e
Onsite — — — — — — —
Daily, Summer (Max) — — — — — — —
Daily, Winter (Max) — — — — — — —
Off-Road Equipment 1.22 10.5 12.5 0.02 0.38 0.35 2,320
Onsite truck 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Average Daily — — — — — — —
Off-Road Equipment 0.19 1.63 1.93 < 0.005 0.06 0.05 359 Onsite truck 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Annual — — — — — — —
Off-Road Equipment 0.03 0.30 0.35 < 0.005 0.01 0.01 59.4 Onsite truck 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Offsite — — — — — — —
Daily, Summer (Max) — — — — — — —
Daily, Winter (Max) — — — — — — —
Worker 0.15 0.16 2.03 0.00 0.58 0.14 560
Vendor < 0.005 0.22 0.11 < 0.005 0.06 0.02 217
Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Average Daily — — — — — — —
Worker 0.02 0.02 0.33 0.00 0.09 0.02 87.8
Vendor < 0.005 0.03 0.02 < 0.005 0.01 < 0.005 33.6
Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Annual — — — — — — —
Worker < 0.005 < 0.005 0.06 0.00 0.02 < 0.005 14.5 Page 1672 of 2028 25-062 19081 Yorba Linda Blvd Detailed Report, 7/18/2025 25 / 68
Vendor < 0.005 0.01 < 0.005 < 0.005 < 0.005 < 0.005 5.56 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00

3.8. Building Construction (2026) - Mitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Location ROG NOx CO SO2 PM10T PM2.5T CO2e
Onsite — — — — — — —
Daily, Summer (Max) — — — — — — —
Daily, Winter (Max) — — — — — — —
Off-Road Equipment 1.22 10.5 12.5 0.02 0.38 0.35 2,320
Onsite truck 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Average Daily — — — — — — —
Off-Road Equipment 0.19 1.63 1.93 < 0.005 0.06 0.05 359 Onsite truck 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Annual — — — — — — —
Off-Road Equipment 0.03 0.30 0.35 < 0.005 0.01 0.01 59.4 Onsite truck 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Offsite — — — — — — —
Daily, Summer (Max) — — — — — — —
Daily, Winter (Max) — — — — — — —
Worker 0.15 0.16 2.03 0.00 0.58 0.14 560
Vendor < 0.005 0.22 0.11 < 0.005 0.06 0.02 217
Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Average Daily — — — — — — —
Worker 0.02 0.02 0.33 0.00 0.09 0.02 87.8
Vendor < 0.005 0.03 0.02 < 0.005 0.01 < 0.005 33.6
Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Annual — — — — — — —

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Worker < 0.005 < 0.005 0.06 0.00 0.02 < 0.005 14.5
Vendor < 0.005 0.01 < 0.005 < 0.005 < 0.005 < 0.005 5.56 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00

3.9. Building Construction (2027) - Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Location ROG NOx CO SO2 PM10T PM2.5T CO2e
Onsite — — — — — — —
Daily, Summer (Max) — — — — — — —
Off-Road Equipment 1.17 10.1 12.4 0.02 0.34 0.31 2,320
Onsite truck 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Daily, Winter (Max) — — — — — — —
Off-Road Equipment 1.17 10.1 12.4 0.02 0.34 0.31 2,320
Onsite truck 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Average Daily — — — — — — —
Off-Road Equipment 0.53 4.55 5.60 0.01 0.15 0.14 1,044
Onsite truck 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Annual — — — — — — —
Off-Road Equipment 0.10 0.83 1.02 < 0.005 0.03 0.03 173 Onsite truck 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Offsite — — — — — — —
Daily, Summer (Max) — — — — — — —
Worker 0.13 0.13 2.21 0.00 0.58 0.14 580
Vendor < 0.005 0.20 0.10 < 0.005 0.06 0.02 213
Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Daily, Winter (Max) — — — — — — —
Worker 0.13 0.14 1.90 0.00 0.58 0.14 550
Vendor < 0.005 0.21 0.10 < 0.005 0.06 0.02 213 Page 1674 of 2028 25-062 19081 Yorba Linda Blvd Detailed Report, 7/18/2025 27 / 68
Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Average Daily — — — — — — —
Worker 0.06 0.07 0.89 0.00 0.26 0.06 251
Vendor < 0.005 0.10 0.05 < 0.005 0.03 0.01 95.8
Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Annual — — — — — — —
Worker 0.01 0.01 0.16 0.00 0.05 0.01 41.6
Vendor < 0.005 0.02 0.01 < 0.005 < 0.005 < 0.005 15.9
Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00

3.10. Building Construction (2027) - Mitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Location ROG NOx CO SO2 PM10T PM2.5T CO2e
Onsite — — — — — — —
Daily, Summer (Max) — — — — — — —
Off-Road Equipment 1.17 10.1 12.4 0.02 0.34 0.31 2,320
Onsite truck 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Daily, Winter (Max) — — — — — — —
Off-Road Equipment 1.17 10.1 12.4 0.02 0.34 0.31 2,320
Onsite truck 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Average Daily — — — — — — —
Off-Road Equipment 0.53 4.55 5.60 0.01 0.15 0.14 1,044
Onsite truck 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Annual — — — — — — —
Off-Road Equipment 0.10 0.83 1.02 < 0.005 0.03 0.03 173 Onsite truck 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Offsite — — — — — — —
Daily, Summer (Max) — — — — — — —

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Worker 0.13 0.13 2.21 0.00 0.58 0.14 580
Vendor < 0.005 0.20 0.10 < 0.005 0.06 0.02 213
Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Daily, Winter (Max) — — — — — — —
Worker 0.13 0.14 1.90 0.00 0.58 0.14 550
Vendor < 0.005 0.21 0.10 < 0.005 0.06 0.02 213
Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Average Daily — — — — — — —
Worker 0.06 0.07 0.89 0.00 0.26 0.06 251
Vendor < 0.005 0.10 0.05 < 0.005 0.03 0.01 95.8
Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Annual — — — — — — —
Worker 0.01 0.01 0.16 0.00 0.05 0.01 41.6
Vendor < 0.005 0.02 0.01 < 0.005 < 0.005 < 0.005 15.9
Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00

3.11. Paving (2027) - Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Location ROG NOx CO SO2 PM10T PM2.5T CO2e
Onsite — — — — — — —
Daily, Summer (Max) — — — — — — —
Off-Road Equipment 0.65 5.74 8.20 0.01 0.23 0.21 1,248
Paving 0.29 — — — — — —
Onsite truck 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Daily, Winter (Max) — — — — — — —
Average Daily — — — — — — —
Off-Road Equipment 0.02 0.16 0.22 < 0.005 0.01 0.01 34.2 Paving 0.01 — — — — — —

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Onsite truck 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Annual — — — — — — —
Off-Road Equipment < 0.005 0.03 0.04 < 0.005 < 0.005 < 0.005 5.66 Paving < 0.005 — — — — — —
Onsite truck 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Offsite — — — — — — —
Daily, Summer (Max) — — — — — — —
Worker 0.04 0.04 0.74 0.00 0.20 0.05 195
Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Daily, Winter (Max) — — — — — — —
Average Daily — — — — — — —
Worker < 0.005 < 0.005 0.02 0.00 0.01 < 0.005 5.14
Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Annual — — — — — — —
Worker < 0.005 < 0.005 < 0.005 0.00 < 0.005 < 0.005 0.85 Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00

3.12. Paving (2027) - Mitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Location ROG NOx CO SO2 PM10T PM2.5T CO2e
Onsite — — — — — — —
Daily, Summer (Max) — — — — — — —
Off-Road Equipment 0.65 5.74 8.20 0.01 0.23 0.21 1,248
Paving 0.29 — — — — — —
Onsite truck 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Page 1677 of 2028 25-062 19081 Yorba Linda Blvd Detailed Report, 7/18/2025 30 / 68
Daily, Winter (Max) — — — — — — —
Average Daily — — — — — — —
Off-Road Equipment 0.02 0.16 0.22 < 0.005 0.01 0.01 34.2 Paving 0.01 — — — — — —
Onsite truck 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Annual — — — — — — —
Off-Road Equipment < 0.005 0.03 0.04 < 0.005 < 0.005 < 0.005 5.66 Paving < 0.005 — — — — — —
Onsite truck 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Offsite — — — — — — —
Daily, Summer (Max) — — — — — — —
Worker 0.04 0.04 0.74 0.00 0.20 0.05 195
Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Daily, Winter (Max) — — — — — — —
Average Daily — — — — — — —
Worker < 0.005 < 0.005 0.02 0.00 0.01 < 0.005 5.14
Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Annual — — — — — — —
Worker < 0.005 < 0.005 < 0.005 0.00 < 0.005 < 0.005 0.85 Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00

3.13. Architectural Coating (2027) - Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Location ROG NOx CO SO2 PM10T PM2.5T CO2e
Onsite — — — — — — —

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Daily, Summer (Max) — — — — — — —
Off-Road Equipment 0.15 1.11 1.50 < 0.005 0.03 0.02 179 Architectural Coatings 106 — — — — — —
Onsite truck 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Daily, Winter (Max) — — — — — — —
Average Daily — — — — — — —
Off-Road Equipment < 0.005 0.03 0.04 < 0.005 < 0.005 < 0.005 4.89 Architectural Coatings 2.91 — — — — — —
Onsite truck 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Annual — — — — — — —
Off-Road Equipment < 0.005 0.01 0.01 < 0.005 < 0.005 < 0.005 0.81 Architectural Coatings 0.53 — — — — — —
Onsite truck 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Offsite — — — — — — —
Daily, Summer (Max) — — — — — — —
Worker 0.03 0.03 0.44 0.00 0.12 0.03 116
Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Daily, Winter (Max) — — — — — — —
Average Daily — — — — — — —
Worker < 0.005 < 0.005 0.01 0.00 < 0.005 < 0.005 3.06
Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Annual — — — — — — —
Worker < 0.005 < 0.005 < 0.005 0.00 < 0.005 < 0.005 0.51 Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00

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3.14. Architectural Coating (2027) - Mitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Location ROG NOx CO SO2 PM10T PM2.5T CO2e
Onsite — — — — — — —
Daily, Summer (Max) — — — — — — —
Off-Road Equipment 0.15 1.11 1.50 < 0.005 0.03 0.02 179 Architectural Coatings 22.3 — — — — — —
Onsite truck 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Daily, Winter (Max) — — — — — — —
Average Daily — — — — — — —
Off-Road Equipment < 0.005 0.03 0.04 < 0.005 < 0.005 < 0.005 4.89 Architectural Coatings 0.61 — — — — — —
Onsite truck 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Annual — — — — — — —
Off-Road Equipment < 0.005 0.01 0.01 < 0.005 < 0.005 < 0.005 0.81 Architectural Coatings 0.11 — — — — — —
Onsite truck 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Offsite — — — — — — —
Daily, Summer (Max) — — — — — — —
Worker 0.03 0.03 0.44 0.00 0.12 0.03 116
Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Daily, Winter (Max) — — — — — — —
Average Daily — — — — — — —
Worker < 0.005 < 0.005 0.01 0.00 < 0.005 < 0.005 3.06
Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Annual — — — Page 1680 of 2028 — — — —
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Worker < 0.005 < 0.005 < 0.005 0.00 < 0.005 < 0.005 0.51 Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00

4. Operations Emissions Details

4.1. Mobile Emissions by Land Use

4.1.1. Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Land Use ROG NOx CO SO2 PM10T PM2.5T CO2e
Daily, Summer (Max) — — — — — — —
Apartments High Rise 1.28 0.94 11.1 0.03 2.90 0.75 3,087 Parking Lot 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Other Asphalt
Surfaces

0.00 0.00 0.00 0.00 0.00 0.00 0.00
Total 1.28 0.94 11.1 0.03 2.90 0.75 3,087
Daily, Winter (Max) — — — — — — —
Apartments High Rise 1.27 1.02 10.3 0.03 2.90 0.75 2,963 Parking Lot 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Other Asphalt
Surfaces

0.00 0.00 0.00 0.00 0.00 0.00 0.00
Total 1.27 1.02 10.3 0.03 2.90 0.75 2,963
Annual — — — — — — —
Apartments High Rise 0.21 0.17 1.72 < 0.005 0.47 0.12 443 Parking Lot 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Other Asphalt
Surfaces

0.00 0.00 0.00 0.00 0.00 0.00 0.00
Total 0.21 0.17 1.72 < 0.005 0.47 0.12 443

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4.1.2. Mitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Land Use ROG NOx CO SO2 PM10T PM2.5T CO2e
Daily, Summer (Max) — — — — — — —
Apartments High Rise 0.90 0.66 7.79 0.02 2.03 0.52 2,161 Parking Lot 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Other Asphalt
Surfaces

0.00 0.00 0.00 0.00 0.00 0.00 0.00
Total 0.90 0.66 7.79 0.02 2.03 0.52 2,161
Daily, Winter (Max) — — — — — — —
Apartments High Rise 0.89 0.72 7.22 0.02 2.03 0.52 2,074 Parking Lot 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Other Asphalt
Surfaces

0.00 0.00 0.00 0.00 0.00 0.00 0.00
Total 0.89 0.72 7.22 0.02 2.03 0.52 2,074
Annual — — — — — — —
Apartments High Rise 0.14 0.12 1.21 < 0.005 0.33 0.08 310 Parking Lot 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Other Asphalt
Surfaces

0.00 0.00 0.00 0.00 0.00 0.00 0.00
Total 0.14 0.12 1.21 < 0.005 0.33 0.08 310

4.2. Energy

4.2.1. Electricity Emissions By Land Use - Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Land Use ROG NOx CO SO2 PM10T PM2.5T CO2e
Daily, Summer (Max) — — — — — — —
Apartments High Rise — — — — — — 217

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Parking Lot — — — — — — 4.26
Other Asphalt
Surfaces
— — — — — — 0.00
Total — — — — — — 221
Daily, Winter (Max) — — — — — — —
Apartments High Rise — — — — — — 217
Parking Lot — — — — — — 4.26
Other Asphalt
Surfaces
— — — — — — 0.00
Total — — — — — — 221
Annual — — — — — — —
Apartments High Rise — — — — — — 35.9
Parking Lot — — — — — — 0.71
Other Asphalt
Surfaces
— — — — — — 0.00
Total — — — — — — 36.6

4.2.2. Electricity Emissions By Land Use - Mitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Land Use ROG NOx CO SO2 PM10T PM2.5T CO2e
Daily, Summer (Max) — — — — — — —
Apartments High Rise — — — — — — 217
Parking Lot — — — — — — 4.26
Other Asphalt
Surfaces
— — — — — — 0.00
Total — — — — — — 221
Daily, Winter (Max) — — — — — — —
Apartments High Rise — — — — — — 217
Parking Lot — — — — — — 4.26

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Other Asphalt — — — — — — 0.00
Surfaces
Total — — — — — — 221
Annual — — — — — — —
Apartments High Rise — — — — — — 35.9
Parking Lot — — — — — — 0.71
Other Asphalt
Surfaces
— — — — — — 0.00
Total — — — — — — 36.6

4.2.3. Natural Gas Emissions By Land Use - Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Land Use ROG NOx CO SO2 PM10T PM2.5T CO2e
Daily, Summer (Max) — — — — — — —
Apartments High Rise 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Parking Lot 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Other Asphalt
Surfaces

0.00 0.00 0.00 0.00 0.00 0.00 0.00
Total 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Daily, Winter (Max) — — — — — — —
Apartments High Rise 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Parking Lot 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Other Asphalt
Surfaces

0.00 0.00 0.00 0.00 0.00 0.00 0.00
Total 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Annual — — — — — — —
Apartments High Rise 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Parking Lot 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Other Asphalt
Surfaces

0.00 0.00 0.00 0.00 0.00 0.00 0.00

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Total 0.00 0.00 0.00 0.00 0.00 0.00 0.00

4.2.4. Natural Gas Emissions By Land Use - Mitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Land Use ROG NOx CO SO2 PM10T PM2.5T CO2e
Daily, Summer (Max) — — — — — — —
Apartments High Rise 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Parking Lot 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Other Asphalt
Surfaces

0.00 0.00 0.00 0.00 0.00 0.00 0.00
Total 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Daily, Winter (Max) — — — — — — —
Apartments High Rise 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Parking Lot 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Other Asphalt
Surfaces

0.00 0.00 0.00 0.00 0.00 0.00 0.00
Total 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Annual — — — — — — —
Apartments High Rise 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Parking Lot 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Other Asphalt
Surfaces

0.00 0.00 0.00 0.00 0.00 0.00 0.00
Total 0.00 0.00 0.00 0.00 0.00 0.00 0.00

4.3. Area Emissions by Source

4.3.1. Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Source ROG NOx CO SO2 PM10T PM2.5T CO2e

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Daily, Summer (Max) — — — — — — —
Hearths 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Consumer Products 3.59 — — — — — —
Architectural Coatings 0.29 — — — — — —
Landscape Equipment 0.31 0.03 3.52 < 0.005 < 0.005 < 0.005 9.44 Total 4.19 0.03 3.52 < 0.005 < 0.005 < 0.005 9.44
Daily, Winter (Max) — — — — — — —
Hearths 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Consumer Products 3.59 — — — — — —
Architectural Coatings 0.29 — — — — — —
Total 3.88 0.00 0.00 0.00 0.00 0.00 0.00
Annual — — — — — — —
Hearths 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Consumer Products 0.66 — — — — — —
Architectural Coatings 0.05 — — — — — —
Landscape Equipment 0.04 < 0.005 0.44 < 0.005 < 0.005 < 0.005 1.07 Total 0.75 < 0.005 0.44 < 0.005 < 0.005 < 0.005 1.07

4.3.2. Mitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Source ROG NOx CO SO2 PM10T PM2.5T CO2e
Daily, Summer (Max) — — — — — — —
Hearths 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Consumer Products 3.59 — — — — — —
Architectural Coatings 0.29 — — — — — —
Landscape Equipment 0.31 0.03 3.52 < 0.005 < 0.005 < 0.005 9.44 Total 4.19 0.03 3.52 < 0.005 < 0.005 < 0.005 9.44
Daily, Winter (Max) — — — — — — —

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Hearths 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Consumer Products 3.59 — — — — — —
Architectural Coatings 0.29 — — — — — —
Total 3.88 0.00 0.00 0.00 0.00 0.00 0.00
Annual — — — — — — —
Hearths 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Consumer Products 0.66 — — — — — —
Architectural Coatings 0.05 — — — — — —
Landscape Equipment 0.04 < 0.005 0.44 < 0.005 < 0.005 < 0.005 1.07 Total 0.75 < 0.005 0.44 < 0.005 < 0.005 < 0.005 1.07

4.4. Water Emissions by Land Use

4.4.1. Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Land Use ROG NOx CO SO2 PM10T PM2.5T CO2e
Daily, Summer (Max) — — — — — — —
Apartments High Rise — — — — — — 36.0
Parking Lot — — — — — — 0.00
Other Asphalt
Surfaces
— — — — — — 0.00
Total — — — — — — 36.0
Daily, Winter (Max) — — — — — — —
Apartments High Rise — — — — — — 36.0
Parking Lot — — — — — — 0.00
Other Asphalt
Surfaces
— — — — — — 0.00
Total — — — — — — 36.0
Annual — — — — — — —

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Apartments High Rise — — — — — — 5.96
Parking Lot — — — — — — 0.00
Other Asphalt
Surfaces
— — — — — — 0.00
Total — — — — — — 5.96

4.4.2. Mitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Land Use ROG NOx CO SO2 PM10T PM2.5T CO2e
Daily, Summer (Max) — — — — — — —
Apartments High Rise — — — — — — 36.0
Parking Lot — — — — — — 0.00
Other Asphalt
Surfaces
— — — — — — 0.00
Total — — — — — — 36.0
Daily, Winter (Max) — — — — — — —
Apartments High Rise — — — — — — 36.0
Parking Lot — — — — — — 0.00
Other Asphalt
Surfaces
— — — — — — 0.00
Total — — — — — — 36.0
Annual — — — — — — —
Apartments High Rise — — — — — — 5.96
Parking Lot — — — — — — 0.00
Other Asphalt
Surfaces
— — — — — — 0.00
Total — — — — — — 5.96

4.5. Waste Emissions by Land Use

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4.5.1. Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Land Use ROG NOx CO SO2 PM10T PM2.5T CO2e
Daily, Summer (Max) — — — — — — —
Apartments High Rise — — — — — — 86.6
Parking Lot — — — — — — 0.00
Other Asphalt
Surfaces
— — — — — — 0.00
Total — — — — — — 86.6
Daily, Winter (Max) — — — — — — —
Apartments High Rise — — — — — — 86.6
Parking Lot — — — — — — 0.00
Other Asphalt
Surfaces
— — — — — — 0.00
Total — — — — — — 86.6
Annual — — — — — — —
Apartments High Rise — — — — — — 14.3
Parking Lot — — — — — — 0.00
Other Asphalt
Surfaces
— — — — — — 0.00
Total — — — — — — 14.3

4.5.2. Mitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Land Use ROG NOx CO SO2 PM10T PM2.5T CO2e
Daily, Summer (Max) — — — — — — —
Apartments High Rise — — — — — — 86.6
Parking Lot — — — — — — 0.00

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Other Asphalt — — — — — — 0.00
Surfaces
Total — — — — — — 86.6
Daily, Winter (Max) — — — — — — —
Apartments High Rise — — — — — — 86.6
Parking Lot — — — — — — 0.00
Other Asphalt
Surfaces
— — — — — — 0.00
Total — — — — — — 86.6
Annual — — — — — — —
Apartments High Rise — — — — — — 14.3
Parking Lot — — — — — — 0.00
Other Asphalt
Surfaces
— — — — — — 0.00
Total — — — — — — 14.3

4.6. Refrigerant Emissions by Land Use

4.6.1. Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Land Use ROG NOx CO SO2 PM10T PM2.5T CO2e
Daily, Summer (Max) — — — — — — —
Apartments High Rise — — — — — — 1.20
Total — — — — — — 1.20
Daily, Winter (Max) — — — — — — —
Apartments High Rise — — — — — — 1.20
Total — — — — — — 1.20
Annual — — — — — — —
Apartments High Rise — — — — — — 0.20

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Total — — — — — — 0.20

4.6.2. Mitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Land Use ROG NOx CO SO2 PM10T PM2.5T CO2e
Daily, Summer (Max) — — — — — — —
Apartments High Rise — — — — — — 1.20
Total — — — — — — 1.20
Daily, Winter (Max) — — — — — — —
Apartments High Rise — — — — — — 1.20
Total — — — — — — 1.20
Annual — — — — — — —
Apartments High Rise — — — — — — 0.20
Total — — — — — — 0.20

4.7. Offroad Emissions By Equipment Type

4.7.1. Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Equipment Type ROG NOx CO SO2 PM10T PM2.5T CO2e
Daily, Summer (Max) — — — — — — —
Total — — — — — — —
Daily, Winter (Max) — — — — — — —
Total — — — — — — —
Annual — — — — — — —
Total — — — — — — —

4.7.2. Mitigated

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Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Equipment Type ROG NOx CO SO2 PM10T PM2.5T CO2e
Daily, Summer (Max) — — — — — — —
Total — — — — — — —
Daily, Winter (Max) — — — — — — —
Total — — — — — — —
Annual — — — — — — —
Total — — — — — — —

4.8. Stationary Emissions By Equipment Type

4.8.1. Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Equipment Type ROG NOx CO SO2 PM10T PM2.5T CO2e
Daily, Summer (Max) — — — — — — —
Total — — — — — — —
Daily, Winter (Max) — — — — — — —
Total — — — — — — —
Annual — — — — — — —
Total — — — — — — —

4.8.2. Mitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Equipment Type ROG NOx CO SO2 PM10T PM2.5T CO2e
Daily, Summer (Max) — — — — — — —
Total — — — — — — —
Daily, Winter (Max) — — — — — — —
Total — — — — — — —

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Annual — — — — — — —
Total — — — — — — —

4.9. User Defined Emissions By Equipment Type

4.9.1. Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Equipment Type ROG NOx CO SO2 PM10T PM2.5T CO2e
Daily, Summer (Max) — — — — — — —
Total — — — — — — —
Daily, Winter (Max) — — — — — — —
Total — — — — — — —
Annual — — — — — — —
Total — — — — — — —

4.9.2. Mitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Equipment Type ROG NOx CO SO2 PM10T PM2.5T CO2e
Daily, Summer (Max) — — — — — — —
Total — — — — — — —
Daily, Winter (Max) — — — — — — —
Total — — — — — — —
Annual — — — — — — —
Total — — — — — — —

4.10. Soil Carbon Accumulation By Vegetation Type

4.10.1. Soil Carbon Accumulation By Vegetation Type - Unmitigated

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Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Vegetation ROG NOx CO SO2 PM10T PM2.5T CO2e
Daily, Summer (Max) — — — — — — —
Total — — — — — — —
Daily, Winter (Max) — — — — — — —
Total — — — — — — —
Annual — — — — — — —
Total — — — — — — —

4.10.2. Above and Belowground Carbon Accumulation by Land Use Type - Unmitigated Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Land Use ROG NOx CO SO2 PM10T PM2.5T CO2e
Daily, Summer (Max) — — — — — — —
Total — — — — — — —
Daily, Winter (Max) — — — — — — —
Total — — — — — — —
Annual — — — — — — —
Total — — — — — — —

4.10.3. Avoided and Sequestered Emissions by Species - Unmitigated Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Species ROG NOx CO SO2 PM10T PM2.5T CO2e
Daily, Summer (Max) — — — — — — —
Avoided — — — — — — —
Subtotal — — — — — — —
Sequestered — — — — — — —
Subtotal — — — — — — —
Removed — — — — — — —

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Subtotal — — — — — — —
— — — — — — — —
Daily, Winter (Max) — — — — — — —
Avoided — — — — — — —
Subtotal — — — — — — —
Sequestered — — — — — — —
Subtotal — — — — — — —
Removed — — — — — — —
Subtotal — — — — — — —
— — — — — — — —
Annual — — — — — — —
Avoided — — — — — — —
Subtotal — — — — — — —
Sequestered — — — — — — —
Subtotal — — — — — — —
Removed — — — — — — —
Subtotal — — — — — — —
— — — — — — — —

4.10.4. Soil Carbon Accumulation By Vegetation Type - Mitigated Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Vegetation ROG NOx CO SO2 PM10T PM2.5T CO2e
Daily, Summer (Max) — — — — — — —
Total — — — — — — —
Daily, Winter (Max) — — — — — — —
Total — — — — — — —
Annual — — — — — — —
Total — — — — — — —

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4.10.5. Above and Belowground Carbon Accumulation by Land Use Type - Mitigated Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Land Use ROG NOx CO SO2 PM10T PM2.5T CO2e
Daily, Summer (Max) — — — — — — —
Total — — — — — — —
Daily, Winter (Max) — — — — — — —
Total — — — — — — —
Annual — — — — — — —
Total — — — — — — —

4.10.6. Avoided and Sequestered Emissions by Species - Mitigated Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Species ROG NOx CO SO2 PM10T PM2.5T CO2e
Daily, Summer (Max) — — — — — — —
Avoided — — — — — — —
Subtotal — — — — — — —
Sequestered — — — — — — —
Subtotal — — — — — — —
Removed — — — — — — —
Subtotal — — — — — — —
— — — — — — — —
Daily, Winter (Max) — — — — — — —
Avoided — — — — — — —
Subtotal — — — — — — —
Sequestered — — — — — — —
Subtotal — — — — — — —
Removed — — — — — — —
Subtotal — — — Page 1696 of 2028 — — — —
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— — — — — — — —
Annual — — — — — — —
Avoided — — — — — — —
Subtotal — — — — — — —
Sequestered — — — — — — —
Subtotal — — — — — — —
Removed — — — — — — —
Subtotal — — — — — — —
— — — — — — — —

5. Activity Data

5.1. Construction Schedule
Phase Name Phase Type Start Date End Date Days Per Week Work Days per Phase Phase Description Demolition Demolition 9/1/2026 9/29/2026 5.00 20.0 —
Site Preparation Site Preparation 9/30/2026 10/4/2026 5.00 3.00 — Grading Grading 10/5/2026 10/13/2026 5.00 6.00 —
Building Construction Building Construction 10/14/2026 8/18/2027 5.00 220 — Paving Paving 8/19/2027 9/2/2027 5.00 10.0 —
Architectural Coating Architectural Coating 9/3/2027 9/17/2027 5.00 10.0 —

5.2. Off-Road Equipment

5.2.1. Unmitigated
Phase Name Equipment Type Fuel Type Engine Tier Number per Day Hours Per Day Horsepower Load Factor Demolition Tractors/Loaders/Back
hoes
Diesel Average 3.00 8.00 84.0 0.37
Demolition Rubber Tired Dozers Diesel Average 1.00 8.00 367 0.40

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Demolition Concrete/Industrial
Saws
Diesel Average 1.00 8.00 33.0 0.73
Site Preparation Graders Diesel Average 1.00 8.00 148 0.41 Site Preparation Scrapers Diesel Average 1.00 8.00 423 0.48 Site Preparation Tractors/Loaders/Back
hoes
Diesel Average 0.00 8.00 84.0 0.37
Site Preparation Crawler Tractors Diesel Average 1.00 8.00 87.0 0.43 Site Preparation Other Construction
Equipment
Diesel Average 1.00 8.00 82.0 0.42
Grading Graders Diesel Average 1.00 8.00 148 0.41
Grading Rubber Tired Dozers Diesel Average 1.00 8.00 367 0.40 Grading Tractors/Loaders/Back
hoes
Diesel Average 0.00 8.00 84.0 0.37
Grading Crawler Tractors Diesel Average 2.00 8.00 87.0 0.43 Building Construction Cranes Diesel Average 1.00 8.00 367 0.29 Building Construction Forklifts Diesel Average 2.00 8.00 82.0 0.20 Building Construction Generator Sets Diesel Average 1.00 8.00 14.0 0.74 Building Construction Tractors/Loaders/Back
hoes
Diesel Average 1.00 8.00 84.0 0.37
Building Construction Welders Diesel Average 3.00 8.00 46.0 0.45 Paving Tractors/Loaders/Back
hoes
Diesel Average 1.00 8.00 84.0 0.37
Paving Pavers Diesel Average 1.00 8.00 81.0 0.42
Paving Paving Equipment Diesel Average 1.00 8.00 89.0 0.36 Paving Rollers Diesel Average 2.00 8.00 36.0 0.38
Paving Cement and Mortar
Mixers
Diesel Average 1.00 8.00 10.0 0.56
Architectural Coating Air Compressors Diesel Average 1.00 8.00 37.0 0.48

5.2.2. Mitigated
Phase Name Equipment Type Fuel Type Engine TierPage 1698 of 2028 Number per Day Hours Per Day Horsepower Load Factor 25-062 19081 Yorba Linda Blvd Detailed Report, 7/18/2025 51 / 68
Demolition Tractors/Loaders/Back Diesel Average 3.00 8.00 84.0 0.37 Demolition Rubber Tired Dozers Diesel Average 1.00 8.00 367 0.40 Demolition Concrete/Industrial
Saws
Diesel Average 1.00 8.00 33.0 0.73
Site Preparation Graders Diesel Average 1.00 8.00 148 0.41 Site Preparation Scrapers Diesel Average 1.00 8.00 423 0.48 Site Preparation Tractors/Loaders/Back
hoes
Diesel Average 0.00 8.00 84.0 0.37
Site Preparation Crawler Tractors Diesel Average 1.00 8.00 87.0 0.43 Site Preparation Other Construction
Equipment
Diesel Average 1.00 8.00 82.0 0.42
Grading Graders Diesel Average 1.00 8.00 148 0.41
Grading Rubber Tired Dozers Diesel Average 1.00 8.00 367 0.40 Grading Tractors/Loaders/Back
hoes
Diesel Average 0.00 8.00 84.0 0.37
Grading Crawler Tractors Diesel Average 2.00 8.00 87.0 0.43 Building Construction Cranes Diesel Average 1.00 8.00 367 0.29 Building Construction Forklifts Diesel Average 2.00 8.00 82.0 0.20 Building Construction Generator Sets Diesel Average 1.00 8.00 14.0 0.74 Building Construction Tractors/Loaders/Back
hoes
Diesel Average 1.00 8.00 84.0 0.37
Building Construction Welders Diesel Average 3.00 8.00 46.0 0.45 Paving Tractors/Loaders/Back
hoes
Diesel Average 1.00 8.00 84.0 0.37
Paving Pavers Diesel Average 1.00 8.00 81.0 0.42
Paving Paving Equipment Diesel Average 1.00 8.00 89.0 0.36 Paving Rollers Diesel Average 2.00 8.00 36.0 0.38
Paving Cement and Mortar
Mixers
Diesel Average 1.00 8.00 10.0 0.56
Architectural Coating Air Compressors Diesel Average 1.00 8.00 37.0 0.48

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5.3. Construction Vehicles

5.3.1. Unmitigated
Phase Name Trip Type One-Way Trips per Day Miles per Trip Vehicle Mix Demolition — — — —
Demolition Worker 12.5 18.5 LDA,LDT1,LDT2
Demolition Vendor — 10.2 HHDT,MHDT
Demolition Hauling 14.7 20.0 HHDT
Demolition Onsite truck — — HHDT
Site Preparation — — — —
Site Preparation Worker 10.0 18.5 LDA,LDT1,LDT2
Site Preparation Vendor — 10.2 HHDT,MHDT
Site Preparation Hauling 0.00 20.0 HHDT
Site Preparation Onsite truck — — HHDT
Grading — — — —
Grading Worker 10.0 18.5 LDA,LDT1,LDT2
Grading Vendor — 10.2 HHDT,MHDT
Grading Hauling 212 20.0 HHDT
Grading Onsite truck — — HHDT
Building Construction — — — —
Building Construction Worker 44.6 18.5 LDA,LDT1,LDT2
Building Construction Vendor 6.63 10.2 HHDT,MHDT
Building Construction Hauling 0.00 20.0 HHDT
Building Construction Onsite truck — — HHDT
Paving — — — —
Paving Worker 15.0 18.5 LDA,LDT1,LDT2
Paving Vendor — 10.2 HHDT,MHDT
Paving Hauling 0.00 20.0 HHDT Page 1700 of 2028
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Paving Onsite truck — — HHDT
Architectural Coating — — — —
Architectural Coating Worker 8.93 18.5 LDA,LDT1,LDT2
Architectural Coating Vendor — 10.2 HHDT,MHDT
Architectural Coating Hauling 0.00 20.0 HHDT
Architectural Coating Onsite truck — — HHDT

5.3.2. Mitigated
Phase Name Trip Type One-Way Trips per Day Miles per Trip Vehicle Mix Demolition — — — —
Demolition Worker 12.5 18.5 LDA,LDT1,LDT2
Demolition Vendor — 10.2 HHDT,MHDT
Demolition Hauling 14.7 20.0 HHDT
Demolition Onsite truck — — HHDT
Site Preparation — — — —
Site Preparation Worker 10.0 18.5 LDA,LDT1,LDT2
Site Preparation Vendor — 10.2 HHDT,MHDT
Site Preparation Hauling 0.00 20.0 HHDT
Site Preparation Onsite truck — — HHDT
Grading — — — —
Grading Worker 10.0 18.5 LDA,LDT1,LDT2
Grading Vendor — 10.2 HHDT,MHDT
Grading Hauling 212 20.0 HHDT
Grading Onsite truck — — HHDT
Building Construction — — — —
Building Construction Worker 44.6 18.5 LDA,LDT1,LDT2
Building Construction Vendor 6.63 10.2 HHDT,MHDT
Building Construction Hauling 0.00 20.0 HHDT Page 1701 of 2028 25-062 19081 Yorba Linda Blvd Detailed Report, 7/18/2025 54 / 68
Building Construction Onsite truck — — HHDT
Paving — — — —
Paving Worker 15.0 18.5 LDA,LDT1,LDT2
Paving Vendor — 10.2 HHDT,MHDT
Paving Hauling 0.00 20.0 HHDT
Paving Onsite truck — — HHDT
Architectural Coating — — — —
Architectural Coating Worker 8.93 18.5 LDA,LDT1,LDT2
Architectural Coating Vendor — 10.2 HHDT,MHDT
Architectural Coating Hauling 0.00 20.0 HHDT
Architectural Coating Onsite truck — — HHDT

5.4. Vehicles

5.4.1. Construction Vehicle Control Strategies
Non-applicable. No control strategies activated by user.

5.5. Architectural Coatings
Phase Name Residential Interior Area
Coated (sq ft)
Residential Exterior Area
Coated (sq ft)
Non-Residential Interior Area
Coated (sq ft)
Non-Residential Exterior Area
Coated (sq ft)
Parking Area Coated (sq ft)
Architectural Coating 339,684 113,228 0.00 0.00 2,862

5.6. Dust Mitigation

5.6.1. Construction Earthmoving Activities
Phase Name Material Imported (cy) Material Exported (cy) Acres Graded (acres) Material Demolished (Ton of Debris)
Acres Paved (acres)
Demolition 0.00 0.00 0.00 1,172 —
Site Preparation — — 6.00 0.00 —

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Grading — 10,178 12.0 0.00 —
Paving 0.00 0.00 0.00 0.00 1.09

5.6.2. Construction Earthmoving Control Strategies
Control Strategies Applied Frequency (per day) PM10 Reduction PM2.5 Reduction Water Exposed Area 3 74% 74%

5.7. Construction Paving
Land Use Area Paved (acres) % Asphalt
Apartments High Rise — 0%
Parking Lot 0.12 100%
Other Asphalt Surfaces 0.98 100%

5.8. Construction Electricity Consumption and Emissions Factors kWh per Year and Emission Factor (lb/MWh)
Year kWh per Year CO2 CH4 N2O
2026 0.00 346 0.03 < 0.005
2027 0.00 346 0.03 < 0.005

5.9. Operational Mobile Sources

5.9.1. Unmitigated
Land Use Type Trips/Weekday Trips/Saturday Trips/Sunday Trips/Year VMT/Weekday VMT/Saturday VMT/Sunday VMT/Year Apartments High
Rise
418 282 239 136,136 4,067 2,746 2,329 1,324,950
Parking Lot 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Other Asphalt
Surfaces

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

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5.9.2. Mitigated
Land Use Type Trips/Weekday Trips/Saturday Trips/Sunday Trips/Year VMT/Weekday VMT/Saturday VMT/Sunday VMT/Year Apartments High
Rise
293 197 168 95,295 2,847 1,922 1,630 927,465
Parking Lot 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Other Asphalt
Surfaces

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

5.10. Operational Area Sources

5.10.1. Hearths

5.10.1.1. Unmitigated
Hearth Type Unmitigated (number)
Apartments High Rise —
Wood Fireplaces 0
Gas Fireplaces 0
Propane Fireplaces 0
Electric Fireplaces 0
No Fireplaces 62
Conventional Wood Stoves 0
Catalytic Wood Stoves 0
Non-Catalytic Wood Stoves 0
Pellet Wood Stoves 0

5.10.1.2. Mitigated
Hearth Type Unmitigated (number)
Apartments High Rise —

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Wood Fireplaces 0
Gas Fireplaces 0
Propane Fireplaces 0
Electric Fireplaces 0
No Fireplaces 62
Conventional Wood Stoves 0
Catalytic Wood Stoves 0
Non-Catalytic Wood Stoves 0
Pellet Wood Stoves 0

5.10.2. Architectural Coatings
Residential Interior Area Coated (sq
ft)
Residential Exterior Area Coated (sq
ft)
Non-Residential Interior Area Coated
(sq ft)
Non-Residential Exterior Area
Coated (sq ft)
Parking Area Coated (sq ft)
339683.625 113,228 0.00 0.00 2,862

5.10.3. Landscape Equipment
Season Unit Value
Snow Days day/yr 0.00
Summer Days day/yr 250

5.10.4. Landscape Equipment - Mitigated
Season Unit Value
Snow Days day/yr 0.00
Summer Days day/yr 250

5.11. Operational Energy Consumption

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5.11.1. Unmitigated
Electricity (kWh/yr) and CO2 and CH4 and N2O and Natural Gas (kBTU/yr) Land Use Electricity (kWh/yr) CO2 CH4 N2O Natural Gas (kBTU/yr) Apartments High Rise 227,282 346 0.0330 0.0040 0.00
Parking Lot 4,465 346 0.0330 0.0040 0.00
Other Asphalt Surfaces 0.00 346 0.0330 0.0040 0.00

5.11.2. Mitigated
Electricity (kWh/yr) and CO2 and CH4 and N2O and Natural Gas (kBTU/yr) Land Use Electricity (kWh/yr) CO2 CH4 N2O Natural Gas (kBTU/yr) Apartments High Rise 227,282 346 0.0330 0.0040 0.00
Parking Lot 4,465 346 0.0330 0.0040 0.00
Other Asphalt Surfaces 0.00 346 0.0330 0.0040 0.00

5.12. Operational Water and Wastewater Consumption

5.12.1. Unmitigated
Land Use Indoor Water (gal/year) Outdoor Water (gal/year) Apartments High Rise 2,326,590 345,227
Parking Lot 0.00 0.00
Other Asphalt Surfaces 0.00 0.00

5.12.2. Mitigated
Land Use Indoor Water (gal/year) Outdoor Water (gal/year) Apartments High Rise 2,326,590 345,227
Parking Lot 0.00 0.00
Other Asphalt Surfaces 0.00 0.00

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5.13. Operational Waste Generation

5.13.1. Unmitigated
Land Use Waste (ton/year) Cogeneration (kWh/year)
Apartments High Rise 45.9 —
Parking Lot 0.00 —
Other Asphalt Surfaces 0.00 —

5.13.2. Mitigated
Land Use Waste (ton/year) Cogeneration (kWh/year)
Apartments High Rise 45.9 —
Parking Lot 0.00 —
Other Asphalt Surfaces 0.00 —

5.14. Operational Refrigeration and Air Conditioning Equipment

5.14.1. Unmitigated
Land Use Type Equipment Type Refrigerant GWP Quantity (kg) Operations Leak Rate Service Leak Rate Times Serviced Apartments High Rise Average room A/C &
Other residential A/C
and heat pumps
R-410A 2,088 < 0.005 2.50 2.50 10.0
Apartments High Rise Household
refrigerators and/or
freezers
R-134a 1,430 0.12 0.60 0.00 1.00

5.14.2. Mitigated
Land Use Type Equipment Type Refrigerant GWP Quantity (kg) Operations Leak Rate Service Leak Rate Times Serviced

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Apartments High Rise Average room A/C & R-410A 2,088 < 0.005 2.50 2.50 10.0 Other residential A/C
and heat pumps
Apartments High Rise Household
refrigerators and/or
freezers
R-134a 1,430 0.12 0.60 0.00 1.00

5.15. Operational Off-Road Equipment

5.15.1. Unmitigated
Equipment Type Fuel Type Engine Tier Number per Day Hours Per Day Horsepower Load Factor

5.15.2. Mitigated
Equipment Type Fuel Type Engine Tier Number per Day Hours Per Day Horsepower Load Factor

5.16. Stationary Sources

5.16.1. Emergency Generators and Fire Pumps
Equipment Type Fuel Type Number per Day Hours per Day Hours per Year Horsepower Load Factor

5.16.2. Process Boilers
Equipment Type Fuel Type Number Boiler Rating (MMBtu/hr) Daily Heat Input (MMBtu/day) Annual Heat Input (MMBtu/yr)

5.17. User Defined
Equipment Type Fuel Type

5.18. Vegetation

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5.18.1. Land Use Change

5.18.1.1. Unmitigated
Vegetation Land Use Type Vegetation Soil Type Initial Acres Final Acres

5.18.1.2. Mitigated
Vegetation Land Use Type Vegetation Soil Type Initial Acres Final Acres

5.18.1. Biomass Cover Type

5.18.1.1. Unmitigated
Biomass Cover Type Initial Acres Final Acres

5.18.1.2. Mitigated
Biomass Cover Type Initial Acres Final Acres

5.18.2. Sequestration

5.18.2.1. Unmitigated
Tree Type Number Electricity Saved (kWh/year) Natural Gas Saved (btu/year)

5.18.2.2. Mitigated
Tree Type Number Electricity Saved (kWh/year) Natural Gas Saved (btu/year)

6. Climate Risk Detailed Report

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6.1. Climate Risk Summary
Cal-Adapt midcentury 2040–2059 average projections for four hazards are reported below for your project location. These are under Representation Concentration Pathway (RCP) 8.5 which assumes GHG emissions will continue to rise strongly through 2050 and then plateau around 2100.

Climate Hazard Result for Project Location Unit
Temperature and Extreme Heat 13.1 annual days of extreme heat Extreme Precipitation 5.70 annual days with precipitation above 20 mm Sea Level Rise — meters of inundation depth
Wildfire 23.0 annual hectares burned
Temperature and Extreme Heat data are for grid cell in which your project are located. The projection is based on the 98th historical percentile of daily maximum/minimum temperatures from observed historical data (32 climate model ensemble from Cal-Adapt, 2040–2059 average under RCP 8.5). Each grid cell is 6 kilometers (km) by 6 km, or 3.7 miles (mi) by 3.7 mi.

Extreme Precipitation data are for the grid cell in which your project are located. The threshold of 20 mm is equivalent to about ¾ an inch of rain, which would be light to moderate rainfall if received over a full day or heavy rain if received over a period of 2 to 4 hours. Each grid cell is 6 kilometers (km) by 6 km, or 3.7 miles (mi) by 3.7 mi.

Sea Level Rise data are for the grid cell in which your project are located. The projections are from Radke et al. (2017), as reported in Cal-Adapt (Radke et al., 2017, CEC-500-2017-008), and consider inundation location and depth for the San Francisco Bay, the Sacramento-San Joaquin River Delta and California coast resulting different increments of sea level rise coupled with extreme storm events. Users may select from four scenarios to view the range in potential inundation depth for the grid cell. The four scenarios are: No rise, 0.5 meter, 1.0 meter, 1.41 meters Wildfire data are for the grid cell in which your project are located. The projections are from UC Davis, as reported in Cal-Adapt (2040–2059 average under RCP 8.5), and consider historical data of climate, vegetation, population density, and large (> 400 ha) fire history. Users may select from four model simulations to view the range in potential wildfire probabilities for the grid cell. The four simulations make different assumptions about expected rainfall and temperature are: Warmer/drier (HadGEM2-ES), Cooler/wetter (CNRM-CM5), Average conditions (CanESM2), Range of different rainfall and temperature possibilities (MIROC5). Each grid cell is 6 kilometers (km) by 6 km, or 3.7 miles (mi) by 3.7 mi.

6.2. Initial Climate Risk Scores
Climate Hazard Exposure Score Sensitivity Score Adaptive Capacity Score Vulnerability Score Temperature and Extreme Heat 1 0 0 N/A
Extreme Precipitation N/A N/A N/A N/A
Sea Level Rise 1 0 0 N/A
Wildfire 1 0 0 N/A
Flooding N/A N/A N/A N/A
Drought N/A N/A N/A N/A
Snowpack Reduction N/A N/A N/A N/A
Air Quality Degradation 0 0 0 N/A
The sensitivity score reflects the extent to which a project would be adversely affected by exposure to a climate hazard. Exposure is rated on a scale of 1 to 5, with a score of 5 representing the greatest exposure. Page 1710 of 2028
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The adaptive capacity of a project refers to its ability to manage and reduce vulnerabilities from projected climate hazards. Adaptive capacity is rated on a scale of 1 to 5, with a score of 5 representing the greatest ability to adapt.

The overall vulnerability scores are calculated based on the potential impacts and adaptive capacity assessments for each hazard. Scores do not include implementation of climate risk reduction measures.

6.3. Adjusted Climate Risk Scores
Climate Hazard Exposure Score Sensitivity Score Adaptive Capacity Score Vulnerability Score Temperature and Extreme Heat 1 1 1 2
Extreme Precipitation N/A N/A N/A N/A
Sea Level Rise 1 1 1 2
Wildfire 1 1 1 2
Flooding N/A N/A N/A N/A
Drought N/A N/A N/A N/A
Snowpack Reduction N/A N/A N/A N/A
Air Quality Degradation 1 1 1 2
The sensitivity score reflects the extent to which a project would be adversely affected by exposure to a climate hazard. Exposure is rated on a scale of 1 to 5, with a score of 5 representing the greatest exposure.

The adaptive capacity of a project refers to its ability to manage and reduce vulnerabilities from projected climate hazards. Adaptive capacity is rated on a scale of 1 to 5, with a score of 5 representing the greatest ability to adapt.

The overall vulnerability scores are calculated based on the potential impacts and adaptive capacity assessments for each hazard. Scores include implementation of climate risk reduction measures.

6.4. Climate Risk Reduction Measures

7. Health and Equity Details

7.1. CalEnviroScreen 4.0 Scores
The maximum CalEnviroScreen score is 100. A high score (i.e., greater than 50) reflects a higher pollution burden compared to other census tracts in the state.

Indicator Result for Project Census Tract
Exposure Indicators —
AQ-Ozone 59.9
AQ-PM 80.0

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AQ-DPM 48.6
Drinking Water 36.7
Lead Risk Housing 20.7
Pesticides 0.00
Toxic Releases 84.6
Traffic 18.0
Effect Indicators —
CleanUp Sites 58.2
Groundwater 0.00
Haz Waste Facilities/Generators 80.2
Impaired Water Bodies 0.00
Solid Waste 9.67
Sensitive Population —
Asthma 9.36
Cardio-vascular 31.1
Low Birth Weights 38.2
Socioeconomic Factor Indicators —
Education 23.3
Housing 35.3
Linguistic 41.4
Poverty 6.28
Unemployment 21.1

7.2. Healthy Places Index Scores
The maximum Health Places Index score is 100. A high score (i.e., greater than 50) reflects healthier community conditions compared to other census tracts in the state.

Indicator Result for Project Census Tract
Economic —
Above Poverty 93.40433723

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Employed 79.36609778
Median HI 94.17425895
Education —
Bachelor's or higher 81.30373412
High school enrollment 100
Preschool enrollment 60.14371872
Transportation —
Auto Access 86.34672142
Active commuting 29.20569742
Social —
2-parent households 92.86539202
Voting 80.09752342
Neighborhood —
Alcohol availability 91.72334146
Park access 41.10098807
Retail density 14.69267291
Supermarket access 25.7153856
Tree canopy 38.36776594
Housing —
Homeownership 98.1265238
Housing habitability 89.82420121
Low-inc homeowner severe housing cost burden 58.7065315 Low-inc renter severe housing cost burden 69.26729116
Uncrowded housing 64.30129603
Health Outcomes —
Insured adults 87.18080328
Arthritis 0.0
Asthma ER Admissions 80.7

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High Blood Pressure 0.0
Cancer (excluding skin) 0.0
Asthma 0.0
Coronary Heart Disease 0.0
Chronic Obstructive Pulmonary Disease 0.0
Diagnosed Diabetes 0.0
Life Expectancy at Birth 79.2
Cognitively Disabled 98.4
Physically Disabled 94.1
Heart Attack ER Admissions 49.8
Mental Health Not Good 0.0
Chronic Kidney Disease 0.0
Obesity 0.0
Pedestrian Injuries 19.6
Physical Health Not Good 0.0
Stroke 0.0
Health Risk Behaviors —
Binge Drinking 0.0
Current Smoker 0.0
No Leisure Time for Physical Activity 0.0
Climate Change Exposures —
Wildfire Risk 20.3
SLR Inundation Area 0.0
Children 33.8
Elderly 50.9
English Speaking 64.3
Foreign-born 45.2
Outdoor Workers 72.6

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Climate Change Adaptive Capacity —
Impervious Surface Cover 81.7
Traffic Density 10.1
Traffic Access 23.0
Other Indices —
Hardship 10.9
Other Decision Support —
2016 Voting 81.2

7.3. Overall Health & Equity Scores
Metric Result for Project Census Tract
CalEnviroScreen 4.0 Score for Project Location (a) 20.0 Healthy Places Index Score for Project Location (b) 90.0 Project Located in a Designated Disadvantaged Community (Senate Bill 535) No Project Located in a Low-Income Community (Assembly Bill 1550) No Project Located in a Community Air Protection Program Community (Assembly Bill 617) No a: The maximum CalEnviroScreen score is 100. A high score (i.e., greater than 50) reflects a higher pollution burden compared to other census tracts in the state. b: The maximum Health Places Index score is 100. A high score (i.e., greater than 50) reflects healthier community conditions compared to other census tracts in the state.

7.4. Health & Equity Measures
No Health & Equity Measures selected.

7.5. Evaluation Scorecard
Health & Equity Evaluation Scorecard not completed.

7.6. Health & Equity Custom Measures
No Health & Equity Custom Measures created.

8. User Changes to Default Data
Screen Page 1715 of 2028 Justification
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Land Use Adjusted lot acreage and building sf to match the provided site plan.

Construction: Off-Road Equipment Conservatively assumed equipment would run for 8 hours/day. Replaced t/l/b with crawler tractors during the site preparation and grading phases to accurately assess site disturbance.

Included one "other construction equipment" to account for a wood chipper in the site preparation phase.

Operations: Vehicle Data Adjusted trip rates to ITE 11th edition for multifamily housing (Land Use Code 220).

Operations: Hearths Removed wood burning stoves and fireplaces pursuant to SCAQMD Rule 445.

Operations: Energy Use No NG proposed

19081 Yorba Linda Boulevard Residential Project
Air Quality, Energy, and GHG Impact Analysis
Appendix B: Demolition Calculations

Yorba Linda Housing Element Project
Estimates of Demolition Debris
Building Demolition
Demo Building
Building Height(ft) Area (ft2) Volume (ft3) Volume (cy) All 18 6360 114480 1399
Total 6360 114480 1399
Weight of the Building Demolition Debris (ton/cy): 0.5Total Weight of Building Debris 700 tonsNote 1: FEMA Debris Estimating Field Guide, FEMA 329. September 2010 Hardscape Demolition
Weight of Hardscape 145 lb/ft3
Area Height (ft) Area (ft2) Volume (cf) Weight (lbs) Weight (tons) Hardscape 0.5 13024 6512 944240 472
Total 13024 6512 944240 472
Total Demolition Weight 1172 tons

19081 Yorba Linda Boulevard Residential Project
Air Quality, Energy, and GHG Impact Analysis
Appendix C: Detailed Air Quality Calculation Tables

ROG NOx CO SOx PM10 PM2.5
Demolition 1.4 14.2 15.8 0.0 2.2 0.8
Off-Road 1.4 12.9 14.6 0.0 0.5 0.5
Demolition 0.0 0.0 0.0 0.0 1.2 0.2
Off-Site (Worker Trip) 0.0 0.0 0.7 0.0 0.2 0.0
Hauling 0.0 1.2 0.5 0.0 0.3 0.1
Site Preparation 1.5 13.0 14.3 0.0 1.3 0.7
Off-Road 1.5 13.0 13.7 0.0 0.7 0.6
Dust from Material Movement 0.0 0.0 0.0 0.0 0.6 0.1
Off-Site (Worker Trip) 0.0 0.0 0.5 0.0 0.1 0.0
Grading 2.0 33.8 23.8 0.1 7.1 3.0
Off-Road 1.8 15.8 15.6 0.0 0.8 0.8
Dust from Material Movement 2.1 0.9
Off-Site (Worker Trip) 0.0 0.0 0.5 0.0 0.1 0.0
Off-Site (Hauling Trip) 0.2 18.0 7.7 0.1 4.0 1.3
Building Construction 1.4 10.9 14.6 0.0 1.0 0.5
Off-Road 1.2 10.5 12.5 0.0 0.4 0.3
Onsite Truck 0.0 0.0 0.0 0.0 0.0 0.0
Off-Site (Worker Trip) 0.2 0.2 2.0 0.0 0.6 0.1
Off-Site (Vendor Trip) 0.0 0.2 0.1 0.0 0.1 0.0
Maximum Daily Emission Year 1 2.0 33.8 23.8 0.1 7.1 3.0 Building Construction 1.3 10.4 14.7 0.0 1.0 0.5
Off-Road 1.2 10.1 12.4 0.0 0.3 0.3
Onsite Truck 0.0 0.0 0.0 0.0 0.0 0.0
Off-Site (Worker Trip) 0.1 0.1 2.2 0.0 0.6 0.1
Off-Site (Vendor Trip) 0.0 0.2 0.1 0.0 0.1 0.0
Paving 1.0 5.8 8.9 0.0 0.4 0.3
Off-Road 0.6 5.7 8.2 0.0 0.2 0.2
Paving 0.3 0.0 0.0 0.0 0.0 0.0
Off-Site (Worker Trip) 0.0 0.0 0.7 0.0 0.2 0.0
Architectural Coating 106.5 1.1 1.9 0.0 0.1 0.1
Off-Road 0.2 1.1 1.5 0.0 0.0 0.0
Architectural Coating 106.3
Off-Site (Worker Trip) 0.0 0.0 0.4 0.0 0.1 0.0
Maximum Daily Emission Year 2 106.5 10.4 14.7 0.0 1.0 0.5 Maximum Daily Emissions 106.5 33.8 23.8 0.1 7.1 3.0
SCAQMD Thresholds 75 100 550 150 150 55
Threshold Exceeded? Yes No No No No No
Unmitigated Construction Emissions
Notes: ROG = reactive organic gases, NOx = nitrogen oxides, CO = carbon monoxide, SOx = sulfur oxides, PM10 = particulate matter 10 microns in diameter, PM2.5 = particulate matter 2.5 microns in diameter Source: CalEEMod Output Sheets.

Construction Activity
Maximum Daily Regional Emissions
(pounds/day)
2026 (Year 1)
2027 (Year 2)

ROG NOx CO SOx PM10 PM2.5
Demolition 1.4 14.2 15.8 0.0 2.2 0.8
Off-Road 1.4 12.9 14.6 0.0 0.5 0.5
Demolition 0.0 0.0 0.0 0.0 1.2 0.2
Off-Site (Worker Trip) 0.0 0.0 0.7 0.0 0.2 0.0
Hauling 0.0 1.2 0.5 0.0 0.3 0.1
Site Preparation 1.5 13.0 14.3 0.0 1.3 0.7
Off-Road 1.5 13.0 13.7 0.0 0.7 0.6
Dust from Material Movement 0.0 0.0 0.0 0.0 0.6 0.1
Off-Site (Worker Trip) 0.0 0.0 0.5 0.0 0.1 0.0
Grading 2.0 33.8 23.8 0.1 7.1 3.0
Off-Road 1.8 15.8 15.6 0.0 0.8 0.8
Dust from Material Movement 2.1 0.9
Off-Site (Worker Trip) 0.0 0.0 0.5 0.0 0.1 0.0
Off-Site (Hauling Trip) 0.2 18.0 7.7 0.1 4.0 1.3
Building Construction 1.4 10.9 14.6 0.0 1.0 0.5
Off-Road 1.2 10.5 12.5 0.0 0.4 0.3
Onsite Truck 0.0 0.0 0.0 0.0 0.0 0.0
Off-Site (Worker Trip) 0.2 0.2 2.0 0.0 0.6 0.1
Off-Site (Vendor Trip) 0.0 0.2 0.1 0.0 0.1 0.0
Maximum Daily Emission Year 1 2.0 33.8 23.8 0.1 7.1 3.0 Building Construction 1.3 10.4 14.7 0.0 1.0 0.5
Off-Road 1.2 10.1 12.4 0.0 0.3 0.3
Onsite Truck 0.0 0.0 0.0 0.0 0.0 0.0
Off-Site (Worker Trip) 0.1 0.1 2.2 0.0 0.6 0.1
Off-Site (Vendor Trip) 0.0 0.2 0.1 0.0 0.1 0.0
Paving 1.0 5.8 8.9 0.0 0.4 0.3
Off-Road 0.6 5.7 8.2 0.0 0.2 0.2
Paving 0.3 0.0 0.0 0.0 0.0 0.0
Off-Site (Worker Trip) 0.0 0.0 0.7 0.0 0.2 0.0
Architectural Coating 22.5 1.1 1.9 0.0 0.1 0.1
Off-Road 0.2 1.1 1.5 0.0 0.0 0.0
Architectural Coating 22.3 0.0 0.0 0.0 0.0 0.0
Off-Site (Worker Trip) 0.0 0.0 0.4 0.0 0.1 0.0
Maximum Daily Emission Year 2 22.5 10.4 14.7 0.0 1.0 0.5 Maximum Daily Emissions 22.5 33.8 23.8 0.1 7.1 3.0
SCAQMD Thresholds 75 100 550 150 150 55
Threshold Exceeded? No No No No No No
Notes: ROG = reactive organic gases, NOx = nitrogen oxides, CO = carbon monoxide, SOx = sulfur oxides, PM10 = particulate matter 10 microns in diameter, PM2.5 = particulate matter 2.5 microns in diameter Source: CalEEMod Output Sheets.

Mitigated Construction Emissions
Construction Activity
Maximum Daily Regional Emissions
(pounds/day)
2026 (Year 1)
2027 (Year 2)

ROG NOx CO SOx PM10 PM2.5
Mobile 1.3 1.0 10.3 0.0 2.9 0.7
Area 3.9 - - - - -
Energy 0.0 0.2 0.1 0.0 0.0 0.0
Stationary - - - - - -
Off-Road - - - - - -
Total Winter
Proposed Project
Operational Emissions

0.6 4.7 33.0 0.0 2.1 0.6
Mobile 1.3 0.9 11.1 0.0 2.9 0.7
Area 4.2 0.0 3.5 0.0 0.0 0.0
Energy 0.0 0.2 0.1 0.0 0.0 0.0
Stationary - - - - - -
Off-Road - - - - - -
Total Summer
Proposed Project
Operational Emissions

0.6 4.7 31.6 0.0 2.1 0.6
Mobile 1.3 1.0 11.1 0.0 2.9 0.7
Area 4.2 0.0 3.5 0.0 0.0 0.0
Energy 0.0 0.2 0.1 0.0 0.0 0.0
Stationary - - - - - -
Off-Road - - - - - -
Maximum
Operational
Emissions

5.5 1.2 14.7 0.0 2.9 0.8
SCAQMD
Significance
Thresholds
55 55 550 150 150 55
Threshold Exceeded? No No No No No No
Maximum
Operational Emissions
Operational Activity
Maximum Daily Regional Emissions
(pounds/day)
Winter
Summer

Demolition Rubber Tired Dozers 1 8 0.5 0.5

0.5 Crawler Tractors 1 8 0.5 0.5
Graders 1 8 0.5 0.5
Scrapers 1 8 1 1
2 Graders 1 8 0.5 0.5
Rubber Tired Dozers 1 8 0.5 0.5
Crawler Tractors 2 8 0.5 1
Scrapers 0 8 1 0
2 2
Acres Disturbed per Piece
of Equipment per Day
Source: CalEEMod Output Sheets.

Construction Equipment Modeled in CalEEMod and Acres Disturbed Per Day Site
Preparation
Total Acres Disturbed Per Day (Site Prep)
Total Acres Disturbed Per Day (Grading)
Maximum Acres Disturbed Per Day
Activity Equipment Type Equipment
Quantity
Acres Disturbed
per Day
Total Acres Disturbed Per Day (Demo)
Operating
Hours per
Day
Grading

NOx CO PM10 PM2.5
Demolition 12.9 14.6 1.7 0.7
Site Preparation 13.0 13.7 1.2 0.7
Grading 15.8 15.6 3.0 1.7
Building Construction 10.5 12.5 0.4 0.3
Max Year 1 15.8 15.6 3.0 1.7
Building Construction 10.1 12.4 0.3 0.3
Paving 5.7 8.2 0.2 0.2
Architectural Coating 1.1 1.5 0.0 0.0
Max Year 2 5.7 8.2 0.2 0.2
Maximum Daily Emissions 15.8 15.6 3.0 1.7
SCAQMD Screening Thresholds 170 883 7 4
Threshold Exceeded? No No No No
Localized Construction Emission Estimates
Year 2
Construction Activity
Maximum Daily Localized Emissions
(pounds/day)
Year 1

19081 Yorba Linda Boulevard Residential Project
Air Quality, Energy, and GHG Impact Analysis
Appendix D: Fuel Calculations

Fuel Rate Fuel Use
(gal/hp-hr) (gallons)
Tractors/Loaders/Backhoes 3 8 84 0.37 20 14,918 0.053493354 798.04 Rubber Tired Dozers 1 8 367 0.4 20 23,488 0.046957715 1,102.94 Concrete/Industrial Saws 1 8 33 0.73 20 3,854 0.041937376 161.64 Crawler Tractors 1 8 87 0.43 3 898 0.050365891 45.22
Graders 1 8 148 0.41 3 1,456 0.052054888 75.81
Scrapers 1 8 423 0.48 3 4,873 0.047795335 232.90
Other Construction Equipment 1 8 82 0.42 3 827 0.051356218 42.45 Graders 1 8 148 0.41 6 2,913 0.052054888 151.62
Rubber Tired Dozers 1 8 367 0.4 6 7,046 0.046957715 330.88 Crawler Tractors 2 8 87 0.43 6 3,591 0.050365891 180.88 Cranes 1 8 367 0.29 220 187,317 0.046434547 8,697.97
Forklifts 2 8 82 0.2 220 57,728 0.053469583 3,086.69
Tractors/Loaders/Backhoes 1 8 84 0.37 220 54,701 0.053493354 2,926.13 Generator Sets 1 8 14 0.74 220 18,234 0.069037993 1,258.81 Welders 3 8 46 0.45 220 109,296 0.030223713 3,303.33
Pavers 1 8 81 0.42 10 2,722 0.051638563 140.54
Rollers 2 8 36 0.38 10 2,189 0.053604335 117.33
Paving Equipment 1 8 89 0.36 10 2,563 0.05129285 131.47 Tractors/Loaders/Backhoes 1 8 84 0.37 10 2,486 0.053493354 133.01 Cement and Mortar 1 8 10 0.56 10 448 0.048501212 21.73
Architectual Coating Air Compressors 1 8 37 0.48 10 1,421 0.029379007 41.74 20,918.52
Model Output: OFFROAD2021 (v1.0.5) Emissions Inventory
Region Type: Sub-Area
Region: Riverside (SC)
Calendar Year: 2026
Scenario: All Adopted Rules - Exhaust
Vehicle Classification: OFFROAD2021 Equipment Types
Units: tons/day for Emissions, gallons/year for Fuel, hours/year for Activity, Horsepower-hours/year for Horsepower-hours Region Calendar Year Vehicle Category Model Year Horsepower B Fuel Fuel ConsumptioHorsepower_HoFuel Rate Orange 2026 Construction and Mining - Crawler Tractors Aggregate Aggregate Diesel 775147.1393 15390319.23 0.050365891 Orange 2026 Construction and Mining - Excavators Aggregate Aggregate Diesel 2460206.219 48143282.78 0.051101755 Orange 2026 Construction and Mining - Graders Aggregate Aggregate Diesel 365954.9296 7030174.114 0.052054888 Orange 2026 Construction and Mining - Misc - Concrete/Industrial Saws Aggregate Aggregate Diesel 4839.2 115391.1 0.041937376 Orange 2026 Construction and Mining - Off-Highway Trucks Aggregate Aggregate Diesel 1021025.479 21051545.68 0.048501212 Orange 2026 Construction and Mining - Other Construction Equipment Aggregate Aggregate Diesel 509763.4476 9926031.768 0.051356218 Orange 2026 Construction and Mining - Pavers Aggregate Aggregate Diesel 159356.9816 3086007.282 0.051638563 Orange 2026 Construction and Mining - Paving Equipment Aggregate Aggregate Diesel 176544.8927 3441900.607 0.05129285 Orange 2026 Construction and Mining - Rollers Aggregate Aggregate Diesel 428812.6724 7999589.409 0.053604335 Orange 2026 Construction and Mining - Rubber Tired Dozers Aggregate Aggregate Diesel 90057.32957 1917838.819 0.046957715 Orange 2026 Construction and Mining - Scrapers Aggregate Aggregate Diesel 937069.8253 19605884.81 0.047795335 Orange 2026 Construction and Mining - Tractors/Loaders/Backhoes Aggregate Aggregate Diesel 2432479.876 45472562.08 0.053493354 Orange 2026 Industrial - Forklifts Aggregate Aggregate Diesel 1269050.904 23734071.58 0.053469583 Orange 2026 Light Commercial - Misc - Air Compressors Aggregate Aggregate Diesel 98536.21128 3353966.75 0.029379007 Orange 2026 Light Commercial - Misc - Generator Sets Aggregate Aggregate Diesel 415673.2127 6020934.15 0.069037993 Orange 2026 Light Commercial - Misc - Welders Aggregate Aggregate Diesel 496890.9077 16440432.2 0.030223713 Orange 2026 Construction and Mining - Misc - Cranes Aggregate Aggregate Gasoline 10636.1 229055.75 0.046434547 Paving
Site Preparation
Construction Equipment Fuel Usage (Off-Road)
Total
Source: Fuel Calculation Sheets (see Attachment C)
Building Construction
HorsepowerLoad
Factor
Days of
Construction
Total
HorsepowerhoursActivity Equipment Number Hours per
day
Grading
Demolition

Construction Source Total Trips VMT Fuel Rate
(Gallons/Miles)
Gallons of Diesel
Fuel Gallons of Gasoline Fuel
Haul Trucks 3132.0 62640.0 6.2 10,045 -
Vendor Trucks 2916.2 29745.6 8.9 3,347 -
Worker Vehicles 20800.2 384803.0 24.3 - 15,835
13,392 15,835

5.3. Construction Vehicles Construction Schedule Days per phase

5.3.1 Unmitigated Demolition 20
Phase Name Trip Type One-Way Trips per Day Miles per Trip Vehicle Mix Site Prep 3 Demolition Grading 6
Demolition Worker 12.5 18.5 LDA,LDT1,LDT2 Building Construction 220 Demolition Vendor 10.2 HHDT,MHDT Paving 10
Demolition Hauling 14.65 20 HHDT Coating 10
Demolition Onsite truck HHDT
Site Preparation
Site Preparation Worker 10 18.5 LDA,LDT1,LDT2
Site Preparation Vendor 10.2 HHDT,MHDT
Site Preparation Hauling 0 20 HHDT
Site Preparation Onsite truck HHDT
Grading
Grading Worker 10 18.5 LDA,LDT1,LDT2
Grading Vendor 10.2 HHDT,MHDT
Grading Hauling 212.1666667 20 HHDT
Grading Onsite truck HHDT
Building Construction
Building Construction Worker 44.64 18.5 LDA,LDT1,LDT2
Building Construction Vendor 6.6278 10.2 HHDT,MHDT
Building Construction Hauling 0 20 HHDT
Building Construction Onsite truck HHDT
Paving
Paving Worker 15 18.5 LDA,LDT1,LDT2
Paving Vendor 10.2 HHDT,MHDT
Paving Hauling 0 20 HHDT
Paving Onsite truck HHDT
Architectural Coating
Architectural Coating Worker 8.928 18.5 LDA,LDT1,LDT2
Architectural Coating Vendor 10.2 HHDT,MHDT
Architectural Coating Hauling 0 20 HHDT
Architectural Coating Onsite truck HHDT
Source: EMFAC2025 (v2.0.0) Emissions Inventory
Region Type: Sub-Area
Region: Riverside (SC)
Calendar Year: 2026
Season: Annual
Vehicle Classification: EMFAC2007 Categories
Units: miles/year for Combustion VMT, trips/year for Trips, tons/year for Emissions, 1000 gallons/year for Fuel Consumption Region Calendar Year Vehicle Category Model Year Speed Fuel Total VMT Fuel Consumption Fuel Rate Trip % Orange 2026 HHDT Aggregate Aggregate Diesel 561441537.2 90029.71103 6.236180598 100% Orange 2026 LHDT1 Aggregate Aggregate Diesel 202217878.1 9768.386964 20.70125588 100% Orange 2026 LHDT2 Aggregate Aggregate Diesel 197754155.7 10798.30689 18.31344097 #REF! Orange 2026 MHDT Aggregate Aggregate Diesel 259735745.3 29225.55792 8.887280986 100% Orange 2026 LDA Aggregate Aggregate Gasoline 8044304182 307402.6873 26.16862023 50% Orange 2026 LDT1 Aggregate Aggregate Gasoline 915988079.6 40634.13976 22.54232734 25% Orange 2026 LDT2 Aggregate Aggregate Gasoline 6227284368 278942.7636 22.32459551 25% 50/25/25 Splits 24.30104083
Total
Source: CalEEMod Output Sheets (see Attachment B)
Construction On-Road Fuel Consumption

Construction Source Gallons of Diesel Fuel Gallons of Gasoline Fuel Construction Vehicles 13,392 15,835
Off-Road Construction
Equipment 20,919 -
Total 34,310 15,835
Countywide 14,157,699 977,564
Percentage Increase 0.0024 0.0162
Percentage 0.2% 1.6%
Model Output: OFFROAD2021 (v1.0.5) Emissions Inventory
Region Type: Sub-Area
Region: Riverside (SC)
Calendar Year: 2026
Scenario: All Adopted Rules - Exhaust
Vehicle Classification: OFFROAD2021 Equipment Types
Units: tons/day for Emissions, gallons/year for Fuel, hours/year for Activity, Horsepower-hours/year for Horsepower-hours Region Calendar Year Vehicle Category Model YearHorsepoweFuel Fuel Consumption Orange 2026 Construction and Mining - Bore/Drill Rigs Aggregate Aggregate Diesel 299815.8054 Orange 2026 Construction and Mining - Bucket Aggregate Aggregate Diesel 7132.42843 Orange 2026 Construction and Mining - Compactor Aggregate Aggregate Diesel 11566.88391 Orange 2026 Construction and Mining - Concrete Mixer Aggregate Aggregate Diesel 1075.413939 Orange 2026 Construction and Mining - Concrete Pump Aggregate Aggregate Diesel 10909.79034 Orange 2026 Construction and Mining - Crane less than 35Aggregate Aggregate Diesel 5638.386007 Orange 2026 Construction and Mining - Cranes Aggregate Aggregate Diesel 283969.5728 Orange 2026 Construction and Mining - Crawler Tractors Aggregate Aggregate Diesel 775147.1393 Orange 2026 Construction and Mining - Crushing/Process Aggregate Aggregate Diesel 41690.65273 Orange 2026 Construction and Mining - Excavators Aggregate Aggregate Diesel 2460206.219 Orange 2026 Construction and Mining - Graders Aggregate Aggregate Diesel 365954.9296 Orange 2026 Construction and Mining - Hopper Tractor T Aggregate Aggregate Diesel 704.8302246 Orange 2026 Construction and Mining - Misc - Bore/Drill RAggregate Aggregate Diesel 85.1 Orange 2026 Construction and Mining - Misc - Cement AnAggregate Aggregate Diesel 124.2 Orange 2026 Construction and Mining - Misc - Concrete/I Aggregate Aggregate Diesel 4839.2 Orange 2026 Construction and Mining - Misc - Dumpers/TAggregate Aggregate Diesel 10 Orange 2026 Construction and Mining - Misc - Excavators Aggregate Aggregate Diesel 71.5 Orange 2026 Construction and Mining - Misc - Other Aggregate Aggregate Diesel 266.4 Orange 2026 Construction and Mining - Misc - Pavers Aggregate Aggregate Diesel 18.9 Orange 2026 Construction and Mining - Misc - Paving EquAggregate Aggregate Diesel 31.9 Orange 2026 Construction and Mining - Misc - Plate CompAggregate Aggregate Diesel 89.2 Orange 2026 Construction and Mining - Misc - Rollers Aggregate Aggregate Diesel 548 Orange 2026 Construction and Mining - Misc - Rubber TireAggregate Aggregate Diesel 13.1 Orange 2026 Construction and Mining - Misc - Signal BoarAggregate Aggregate Diesel 3535.25 Orange 2026 Construction and Mining - Misc - Skid Steer LAggregate Aggregate Diesel 3670 Orange 2026 Construction and Mining - Misc - Tractors/LoAggregate Aggregate Diesel 342 Orange 2026 Construction and Mining - Misc - Trenchers Aggregate Aggregate Diesel 461 Orange 2026 Construction and Mining - Nurse Rig Other Aggregate Aggregate Diesel 64.51346555 Orange 2026 Construction and Mining - Off-Highway Trac Aggregate Aggregate Diesel 439647.8456 Orange 2026 Construction and Mining - Off-Highway TrucAggregate Aggregate Diesel 1021025.479 Orange 2026 Construction and Mining - Other ConstructioAggregate Aggregate Diesel 509763.4476 Orange 2026 Construction and Mining - Other Material HaAggregate Aggregate Diesel 157130.781 Orange 2026 Construction and Mining - Pavers Aggregate Aggregate Diesel 159356.9816 Orange 2026 Construction and Mining - Paving Equipmen Aggregate Aggregate Diesel 176544.8927 Orange 2026 Construction and Mining - Rollers Aggregate Aggregate Diesel 428812.6724 Orange 2026 Construction and Mining - Rough Terrain Fo Aggregate Aggregate Diesel 524606.4185 Orange 2026 Construction and Mining - Rubber Tired Doz Aggregate Aggregate Diesel 90057.32957 Orange 2026 Construction and Mining - Rubber Tired LoadAggregate Aggregate Diesel 1795015.113 Orange 2026 Construction and Mining - Scrapers Aggregate Aggregate Diesel 937069.8253 Orange 2026 Construction and Mining - Skid Steer Loader Aggregate Aggregate Diesel 857527.7715 Orange 2026 Construction and Mining - Spray Truck Aggregate Aggregate Diesel 10414.56882 Orange 2026 Construction and Mining - Spreader Tractor Aggregate Aggregate Diesel 1310.018301 Orange 2026 Construction and Mining - Spreader Truck Aggregate Aggregate Diesel 8132.66619 Orange 2026 Construction and Mining - Surfacing EquipmAggregate Aggregate Diesel 83292.52268 Orange 2026 Construction and Mining - Tank Truck Aggregate Aggregate Diesel 17762.98762 Orange 2026 Construction and Mining - Tanker Truck Trai Aggregate Aggregate Diesel 1358.604294 Orange 2026 Construction and Mining - Telescopic HandleAggregate Aggregate Diesel 35542.51104 Orange 2026 Construction and Mining - Tractors/Loaders/Aggregate Aggregate Diesel 2432479.876 Orange 2026 Construction and Mining - Trenchers Aggregate Aggregate Diesel 85505.67955 Orange 2026 Construction and Mining - Vacuum Truck Aggregate Aggregate Diesel 26945.91889 Orange 2026 Construction and Mining - Water Truck Aggregate Aggregate Diesel 80412.65285 Orange 2026 Construction and Mining - Misc - Asphalt PavAggregate Aggregate Gasoline 19866.7 Orange 2026 Construction and Mining - Misc - Bore/Drill RAggregate Aggregate Gasoline 12864.65 Orange 2026 Construction and Mining - Misc - Cement AnAggregate Aggregate Gasoline 74534 Construction Fuel Consumption Summary

Orange 2026 Construction and Mining - Misc - Concrete/I Aggregate Aggregate Gasoline 95662.05 Orange 2026 Construction and Mining - Misc - Cranes Aggregate Aggregate Gasoline 10636.1 Orange 2026 Construction and Mining - Misc - Crushing/PAggregate Aggregate Gasoline 478 Orange 2026 Construction and Mining - Misc - Dumpers/TAggregate Aggregate Gasoline 7755.7 Orange 2026 Construction and Mining - Misc - Other Aggregate Aggregate Gasoline 16206 Orange 2026 Construction and Mining - Misc - Paving EquAggregate Aggregate Gasoline 140412.75 Orange 2026 Construction and Mining - Misc - Plate CompAggregate Aggregate Gasoline 50918 Orange 2026 Construction and Mining - Misc - Rollers Aggregate Aggregate Gasoline 67223.65 Orange 2026 Construction and Mining - Misc - Rough TerrAggregate Aggregate Gasoline 75044 Orange 2026 Construction and Mining - Misc - Rubber TireAggregate Aggregate Gasoline 39785 Orange 2026 Construction and Mining - Misc - Signal BoarAggregate Aggregate Gasoline 1441.6 Orange 2026 Construction and Mining - Misc - Skid Steer LAggregate Aggregate Gasoline 145672.7 Orange 2026 Construction and Mining - Misc - Surfacing EAggregate Aggregate Gasoline 61798 Orange 2026 Construction and Mining - Misc - Tampers/RAggregate Aggregate Gasoline 8510 Orange 2026 Construction and Mining - Misc - Tractors/LoAggregate Aggregate Gasoline 25528.1 Orange 2026 Construction and Mining - Misc - Trenchers Aggregate Aggregate Gasoline 123226.9

Operational Source Countywide Energy Consumption Percentage Increase Project Percentage
Proposed Project 18,759,000,000 0.001%
Proposed Project 60,825,476,870.0 0.001%
Annual VMT
Proposed Project 1,324,950.4 54,522.4 447,487,235.0 0.01% 0.01% CalEEMod Output
Land Use Type Trips/Weekday Trips/Saturday VMT/Year
Land Use Type 417.88 282.1 1324950.414
Apartments High Rise 0 0 0
Parking Lot 0 0 0
Other Asphalt Surfaces 0 0 0
00 5.11. Operational Energy Consumption

5.11.1 Unmitigated
Land Use Electricity (kWh/yr) Natural Gas (kBTU/yr)
Apartments High Rise 227281.7142 688624.2598
Parking Lot 4464.551328 0
Other Asphalt Surfaces 0 0
Source: EMFAC2025 (v2.0.0) Emissions Inventory
Region Type: Sub-Area
Region: Riverside (SC)
Calendar Year: 2026
Season: Annual
Vehicle Classification: EMFAC2007 Categories
Region Calendar Year Vehicle Category Model Year Speed Fuel Fuel Consumption Orange 2026 HHDT Aggregate Aggregate Diesel 561441537.2 90029.71103 Orange 2026 LDA Aggregate Aggregate Diesel 19252399.68 531.2474279 Orange 2026 LDT1 Aggregate Aggregate Diesel 264987.0553 12.39961316 Orange 2026 LDT2 Aggregate Aggregate Diesel 12643794.26 430.4057661 Orange 2026 LHDT1 Aggregate Aggregate Diesel 202217878.1 9768.386964 Orange 2026 LHDT2 Aggregate Aggregate Diesel 197754155.7 10798.30689 Orange 2026 MDV Aggregate Aggregate Diesel 118059403.9 4900.201638 Orange 2026 MH Aggregate Aggregate Diesel 10078695.26 994.6018995 Orange 2026 MHDT Aggregate Aggregate Diesel 259735745.3 29225.55792 Orange 2026 OBUS Aggregate Aggregate Diesel 6962905.331 921.4344754 Orange 2026 SBUS Aggregate Aggregate Diesel 4133773.191 560.3093819 Orange 2026 HHDT Aggregate Aggregate Gasoline 383635.5094 99.24342338 Orange 2026 LDA Aggregate Aggregate Gasoline 8044304182 307402.6873 Orange 2026 LDT1 Aggregate Aggregate Gasoline 915988079.6 40634.13976 Orange 2026 LDT2 Aggregate Aggregate Gasoline 6227284368 278942.7636 Orange 2026 LHDT1 Aggregate Aggregate Gasoline 431107418.3 30100.2946 Orange 2026 LHDT2 Aggregate Aggregate Gasoline 97063511.76 7316.230399 Orange 2026 MCY Aggregate Aggregate Gasoline 100219016.4 2513.971064 Orange 2026 MDV Aggregate Aggregate Gasoline 3789588837 207488.0276 Orange 2026 MH Aggregate Aggregate Gasoline 19551023.26 4002.68797 Orange 2026 MHDT Aggregate Aggregate Gasoline 136459487.9 25916.43022 Orange 2026 OBUS Aggregate Aggregate Gasoline 8597766.192 1687.833577 Orange 2026 SBUS Aggregate Aggregate Gasoline 5809789.909 645.3856039 Orange 2026 UBUS Aggregate Aggregate Gasoline 8687519.247 1172.27338 Row Labels Sum of Fuel Consumption Annual Consumption
Diesel 622.6512003 227,267,688
Gasoline 1225.992425 447,487,235
Grand Total 1848.643625
Units: miles/day for Combustion VMT and Electric VMT, trips/day for Trips, tons/day for Emissions, 1000 gallons/day for Fuel Consumption, kWh/day for Energy Consumption, kg/day for Hydrogen Consumption
Gallons of Gasoline Fuel
Operational Energy Consumption
Electricity (Kilowatt-Hour)
Natural Gas (Thousands British Thermal Units)
Petroleum (Gasoline) Consumption
Source: CalEEMod Output Sheets (see Attachment B)
688,624.3
Energy Usage
231,746.3

2201 N. Grand Avenue #10098 | Santa Ana, CA 92711-0098 | (714) 716-5050 www.ELMTConsulting.com
June 27, 2025

EPD SOLUTIONS
Attention: Konnie Dobreva
3333 Michelson Dr. Suite 500
Irvine, CA 92612
SUBJECT: Biological Resources Assessment for the Proposed Project Located at 19081 Yorba Linda Boulevard in the City of Yorba Linda, Orange County, California Introduction
This report contains the findings of ELMT Consulting’s (ELMT) biological resources assessment for the proposed project located at 19081 Yorba Linda Blvd (project site or site) in the City of Yorba Linda, Orange County, California. The field investigation was conducted by biologist Andrew N. Mestas on May 21, 2025, to document baseline conditions and assess the potential for special-status1 plant and wildlife species to occur within the project boundaries that could pose a constraint to implementation of the proposed project.

Special attention was given to the suitability of the habitat to support special-status plant and wildlife species identified by the California Department of Fish and Wildlife’s (CDFW) California Natural Diversity Database (CNDDB), and other electronic databases as potentially occurring in the general vicinity of the project site.

The project site was also evaluated for its potential to support natural drainage features, ponded areas, and/or water bodies that have the potential to fall under the regulatory authority of the of the United States Army Corps of Engineers (Corps), Regional Water Quality Control Board (Regional Board), or California Department of Fish and Wildlife (CDFW) pursuant to Sections 401 and 404 of the Federal Clean Water Act (CWA), the California Porter-Cologne Water Quality Control Act, and Section 1600 et seq. of the Fish and Game Code.

Project Location
The project site is generally located north and east of State Route 90; and south and west of Chino Hills State Park in the City of Yorba Linda, Orange County, California. The project site is depicted on the Yorba Linda quadrangle of the United States Geological Survey’s (USGS) 7.5-minute topographic map.

Specifically, the project site is located at 19081 Yorba Linda Boulevard. Refer to Exhibits 1 through 3 in Attachment A.

Project Description
The project proposes the construction of multiple single-family residences within the approximately 2.72 1 As used in this report, “special-status” refers to plant and wildlife species that are federally and State listed, proposed, or candidates; plant species that have been designated with a California Native Plant Society Rare Plant Rank; wildlife species that are designated by the CDFW as fully protected, species of special concern, or watch list species; and specially protected natural vegetation communities as designated by the CDFW.

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acre lot.

Methodology
A literature review and records search were conducted to determine which special-status biological resources have the potential to occur on or within the general vicinity of the project site. In addition to the literature review, a general habitat assessment or field investigation of the project site was conducted. The field investigation was conducted to document existing conditions within the project site and assess the potential for special-status biological resources to occur.

Literature Review
Prior to conducting the field study, species and habitat information was gathered from the reports related to the specific project and relevant databases for the Yorba Linda USGS 7.5-minute quadrangle to identify species and habitats known to occur locally. These quadrangles was queried due to existing on-site conditions proximity of the project site to quadrangles boundaries and regional topography. The literature review sources included:
• U.S. Fish and Wildlife (USFWS) threatened and endangered species occurrence GIS overlay; • USFWS Designated Critical Habitat Maps;
• California Natural Diversity Database (CNDDB) Rarefind 5; • International Union for Conservation of Naturae (IUCN); • CNDDB Biogeographic Information and Observation System (BIOS); • California Native Plant Society Electronic Inventory (CNPSEI) database; • Calflora Database;
• United States Department of Agriculture (USDA) Natural Resource Conservation Service (NRCS), Soil Survey;
• USFWS National Wetland Inventory;
• Environmental Protection Agency (EPA) Water Program “My Waters” data layers; • Google Earth Pro historic aerial imagery (1985-2025); • San Bernardino County General Plan;
• USFWS Critical Habitat designations for Threatened and Endangered Species; • USFWS National Wetlands Inventory (NWI)
The literature review provided a baseline from which to inventory the biological resources potentially occurring on the subject property. The CNDDB database was used, in conjunction with ArcGIS software, to locate the nearest recorded occurrences of special-status species and determine the distance from the project site.

Field Investigation
ELMT biologist Andrew N. Mestas evaluated the conditions of the plant communities found within the boundaries of the project site on May 21, 2025. Plant communities identified on aerial photographs during the literature review were verified in the field. The plant communities were evaluated for their potential to support special-status plant and wildlife species. In addition, field staff identified any natural corridors and linkages that may support the movement of wildlife through the area.

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The plant communities were evaluated for their potential to support special-status plant and wildlife species.

Plant communities were mapped using 7.5-minute USGS topographic base maps and aerial photography.

The plant communities were classified in accordance with Sawyer, Keeler-Wolf and Evens (2009) and delineated on an aerial photograph and then digitized into ArcGIS. The ArcGIS application was used to compute the area of each plant community in acres.

Common plant species observed during the field survey were identified by visual characteristics and morphology in the field and recorded in a field notebook. Unusual and less familiar plants were photographed in the field and identified in the laboratory using taxonomic guides. Taxonomic nomenclature used in this study follows the 2012 Jepson Manual (Hickman 2012). In this report, scientific names are provided immediately following common names of plant species (first reference only).

Wildlife species detected during field surveys by sight, calls, tracks, scat, or other sign were recorded during surveys in a field notebook. Field guides were used to assist with identification of wildlife species during the survey included The Sibley Field Guide to the Birds of Western North America (Sibley 2003), A Field Guide to Western Reptiles and Amphibians (Stebbins 2003), and A Field Guide to Mammals of North America (Reid 2006). Although common names of wildlife species are fairly well standardized, scientific names are provided immediately following common names in this report (first reference only). In addition, field staff identified any natural corridors and linkages that may support the movement of wildlife through the area.

Soil Series Assessment
On-site and adjoining soils were researched prior to the field investigation using the USDA NRCS Soil Survey for Orange County. In addition, a review of the local geological conditions and historical aerial photographs was conducted to assess the ecological changes that the project site has undergone.

Jurisdictional Drainages and Wetlands
Aerial photography was reviewed prior to conducting a field investigation in order to locate and inspect any potential natural drainage features, ponded areas, or water bodies that may fall under the jurisdiction of the United States Army Corps of Engineers (Corps), Regional Water Quality Control Board (Regional Board), or CDFW. In general, surface drainage features indicated as blue-line streams on USGS maps that are observed or expected to exhibit evidence of flow are considered potential riparian/riverine habitat and are also subject to state and federal regulatory jurisdiction. In addition, ELMT reviewed jurisdictional waters information through examining historical aerial photographs to gain an understanding of the impact of land-use on natural drainage patterns in the area. The USFWS National Wetland Inventory (NWI) and Environmental Protection Agency (EPA) Water Program “My Waters” data layers were also reviewed to determine whether any hydrologic features and wetland areas have been documented on or within the vicinity of the project site.

Surrounding Land Uses and Site Conditions
The project site occurs in a portion of the City of Yorba Linda that has supported a variety of agricultural land uses since the early 1900’s. The site is surrounded primarily by single-family homes. Recent redevelopment trends shift toward higher-density residential subdivisions. Nearby land uses include public amenities such as Jessamyn West Park and the Yorba Linda Country Club, with commercial services

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available along Yorba Linda Boulevard and at the Yorba Linda Town Center. The site itself is approximately 2.74 acres and was formerly developed with multiple residential structures while the rest of the property supports mature fruit trees and ornamental landscaping.

Historically, Yorba Linda developed as an agricultural community, with early land uses centered on barley, citrus groves, and sheep pasture following its origins as part of the Yorba family’s Spanish land grant.

Citrus production and rail transport via the Pacific Electric line contributed significantly in shaping the city’s development throughout the early 20th century. Over time, agricultural uses in the area transitioned into residential development.

Topography and Soils
The project site is relatively flat and on-site elevation ranges from approximately 436 to 456 feet above mean sea level and generally slopes from north to south. Based on the NRCS USDA Web Soil Survey2 , the
project site is underlain by Yorba gravelly sandy loam (2 to 9 percent slopes). Refer to Exhibit 4¸ Soils, in Attachment A. Soils on-site have been mechanically disturbed and heavily compacted from historic and ongoing land uses.

Vegetation
Due to historic and existing land uses, no native plant communities or natural communities of special concern are present within or adjacent to the project site. The project site supports developed and undeveloped land that has been subjected to roughly a century of anthropogenic disturbances associated with historic and ongoing land uses. These disturbances have eliminated the natural plant communities that historically occurred within the immediate vicinity of the project site. Refer to Attachment B, Site Photographs, for representative site photographs. No native plant communities will be impacted from implementation of the proposed project.

The project site supports two (2) land cover types that would be classified as agricultural/ornamental and developed. Refer to Exhibit 5, Vegetation in Attachment A. Developed areas within the project site consist of land covered by impermeable surfaces such as paved walkways, buildings, and heavily compacted soils.

Developed land exists primarily in the northern portion of the project site and includes a strip of paved driveway extending towards the southern boundary of the project site. Agricultural/ornamental land cover exists throughout the project site and is characterized by planted species of fruit trees, other agricultural species, and common ornamental plant species. Species observed within this land cover type include persimmon (Diospyros kaki), pomegranate (Punica granatum), various citrus (Citrus spp.), avocado (Persea americana), dragon fruit (Hylocereus undatus), agapanthus (Agapanthus africanus), bird of paradise (Strelitzia reginae), banana (Musa spp.), bougainvillea (Bougainvillea spp.), and jasmine (Jasminum spp.). Weedy, annual species such as bromes (Bromus sp.), filaree (Erodium cicutarum), prickly lettuce (Lactuca serriola), cheese weed (Malva parviflora), white sweetclover (Melilotus albus), tree tobacco (Nicotiana glauca), and stinknet (Oncosiphon pilulifer) also occur throughout the project site.

Wildlife
2 A soil series is defined as a group of soils with similar profiles developed from similar parent materials under comparable climatic and vegetation conditions. These profiles include major horizons with similar thickness, arrangement, and other important characteristics, which may promote favorable conditions for certain biological resources.

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Plant communities provide foraging habitat, nesting/denning site, and shelter from adverse weather or predation. This section provides a discussion of those wildlife species that were observed or are expected to occur within the project site. The discussion is to be used as a general reference and is limited by the season, time of day, and weather conditions in which the field investigation was conducted. Wildlife detections were based on calls, songs, scat, tracks, burrows, and direct observation. The project site and offsite street improvement areas provide limited habitat for wildlife species adapted to a high degree of anthropogenic disturbances and development.

Fish
No fish were observed on or within the vicinity of the project site due to a lack suitable habitat for local fish species. No native fish are expected to occur and are presumed absent from the project site.

Amphibians
No amphibians were observed on or within the vicinity of the project site. The site does not provide suitable habitat for local amphibian species. Due to the lack of hydrogeomorphic features on or near the project site, no special-status amphibian species are expected to occur within project site.

Reptiles
The project site provides limited foraging and cover habitat for reptile species adapted to a high degree of anthropogenic disturbance. No reptile species were observed during the field investigation. Reptile species that may be expected to occur within the project site include western side-blotched lizard (Uta stansburiana elegans), Great Basin fence lizard (Sceloporus occidentalis longipes) and alligator lizard (Elgaria multicarinata). Due to the high level of anthropogenic disturbances on-site, and surrounding development, no special-status reptilian species are expected to occur within the project site.

Birds
The project site provides suitable foraging and nesting habitat for bird species adapted to development and a high degree of routine anthropogenic disturbance. Bird species detected during the field investigation include common raven (Corvus corax), house finch (Haemorhous mexicanus), northern mockingbird (Mimus polyglottos), house sparrow (Passer domesticus), yellow-rumped warbler (Setophaga coronata), lesser goldfinch (Spinus psaltria), European starling (Sturnus vulgaris), and mourning dove (Zenaida macroura).

Mammals
The project site provides limited foraging and cover habitat for mammalian species adapted to a high degree of anthropogenic disturbance. Mammalian species observed during the field investigation include California ground squirrel (Otospermophilus beecheyi) and domestic dog (Canis familiaris). Additional common mammalian species that could be expected to occur include coyote (Canis latrans), opossum (Didelphis virginiana), and raccoon (Procyon lotor).

Nesting Birds
No active nests were observed during the field investigation, which was conducted during the breeding season. However, several avian species were observed exhibiting territorial displays. Although subjected

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to routine disturbance, the ornamental vegetation found on-site has the potential to provide suitable nesting habitat for year-round and seasonal avian residents, as well as migrating songbirds that are adapted to urban environments. In addition, tall trees and structures both on and surrounding the project site provide suitable nesting opportunities for raptors.

Nesting birds are protected pursuant to the Migratory Bird Treaty Act (MBTA) and California Fish and Game Code (Sections 3503, 3503.5, 3511, and 3513 prohibit the take, possession, or destruction of birds, their nests or eggs). If construction occurs between February 1st and August 31st, a pre-construction clearance survey for nesting birds should be conducted within three (3) days of the start of any vegetation removal or ground disturbing activities to ensure that no nesting birds will be disturbed during construction.

Migratory Corridors and Linkages
Habitat linkages provide connections between larger habitat areas that are separated by development.

Wildlife corridors are similar to linkages but provide specific opportunities for animals to disperse or migrate between areas. A corridor can be defined as a linear landscape feature of sufficient width to allow animal movement between two comparatively undisturbed habitat fragments. Adequate cover is essential for a corridor to function as a wildlife movement area. It is possible for a habitat corridor to be adequate for one species yet still inadequate for others. Wildlife corridors are features that allow for the dispersal, seasonal migration, breeding, and foraging of a variety of wildlife species. Additionally, open space can provide a buffer against both anthropogenic disturbance and natural fluctuations in resources.

The project site has not been identified as occurring within a Wildlife Corridor or Linkage. The nearest major open space area documented in the vicinity of the proposed project occurs approximately 1.2 miles north within Chino Hills State Park. The project site is separated from this open space area by existing development.

The proposed project will be confined to existing areas that have been heavily disturbed or developed and are isolated from regional wildlife corridors and linkages. In addition, there are no riparian corridors, creeks, or useful patches of steppingstone habitat (natural areas) within or connecting the site to a recognized wildlife corridor or linkage. As such, the project site is not expected to contribute to local wildlife movement opportunities and no impacts to wildlife corridors or linkages will occur from project implementation.

Jurisdictional Areas
There are three key agencies that regulate activities within inland streams, wetlands, and riparian areas in California. The Corps Regulatory Branch regulates discharge of dredge or fill materials into “waters of the United States” pursuant to Section 404 of the Clean Water Act (CWA) and Section 10 of the Rivers and Harbors Act. Of the State agencies, the CDFW regulates alterations to streambed and bank under Fish and Wildlife Code Sections 1600 et seq., and the Regional Board regulates discharges into surface waters pursuant to Section 401 of the CWA and the California Porter-Cologne Water Quality Control Act.

The USFWS NWI and the USGS National Hydrography Dataset were reviewed to determine if any blueline streams or riverine resources have been documented on the project site. Based on this review, no jurisdictional features are mapped as occurring within the boundaries of the project site, further, no features were observed during the field investigation. Therefore, no regulatory approvals will be required.

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Special-Status Biological Resources
The CNDDB Rarefind 5 and the CNPS Electronic Inventory of Rare and Endangered Vascular Plants of California were queried for reported locations of special-status plant and wildlife species as well as specialstatus natural plant communities in the Yorba Linda USGS 7.5-minute quadrangle. The habitat assessment evaluated the conditions of the habitat(s) within the boundaries of the projectsite to determine if the existing plant communities, at the time of the survey, have the potential to provide suitable habitat(s) for specialstatus plant and wildlife species. Only one quadrangle was queried since the project site is developed and entirely surrounded by existing development.

The literature search identified eight (8) special-status plant species, forty-three (43) special-status wildlife species, and three (3) special-status plant communities as having potential to occur within the Yorba Linda USGS 7.5-minute quadrangle. Special-status plant and wildlife species were evaluated for their potential to occur within the project site based on habitat requirements, availability and quality of suitable habitat, and known distributions. Species determined to have the potential to occur within the general vicinity of the project site is presented in Table D-1: Potentially Occurring Special-Status Biological Resources, provided in Attachment C.

Special-Status Plants
According to the CNDDB and CNPS, eight (8) special-status plant species have been recorded in the Yorba Linda quadrangle (refer to Attachment C). No special-status plant species were observed on-site during the field investigation. The project site supports agricultural/ornamental and developed land that has been subject to a variety of anthropogenic disturbances for several decades. Historic and ongoing land uses have eliminated the natural plant communities that once occurred on-site which has removed the ability of the habitat on the project site to provide suitable habitat for special-status plant species known to occur in the general vicinity. Based on habitat requirements for specific special-status plant species and the availability and quality of habitats needed by each species, it was determined that the project site does not provide suitable habitat for any of the special-status plant species known to occur in the area and all are presumed to be absent. No focused surveys are recommended.

Special-Status Wildlife
According to the CNDDB, forty-three (43) special-status wildlife species have been reported in the Yorba Linda quadrangle (refer to Attachment C). No special-status wildlife species were observed on-site during the habitat assessment. The project site consists of agricultural/ornamental and developed land that have been subject to a variety of anthropogenic disturbances. These developments have eliminated the natural plant communities that once occurred on-site which have greatly reduced potential foraging opportunities for wildlife species. Based on habitat requirements for specific species and the availability and suitable habitats, it was determined that the proposed project site has a high potential to support Cooper’s hawk (Accipiter cooperii) and sharp-shinned hawk (Accipiter striatus). It was further determined that the project site does not have the potential to support any of the other special-status wildlife species known to occur in the area since the site has been heavily impacted by on-site disturbances and surrounding development.

None of the aforementioned special-status wildlife species are federally or State listed as endangered or threatened. In order to ensure impacts to special-status avian species do not occur from implementation of the proposed project, a pre-construction nesting bird clearance survey shall be conducted prior to ground

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disturbance. With implementation of the pre-construction nesting bird clearance survey, impacts to these species will be less than significant and no mitigation will be required.

Special-Status Plant Communities
According to the CNDDB, three (3) special-status plant communities have been reported in the Yorba Linda USGS 7.5-minute quadrangle: California Walnut Woodland, South Coast Live Oak Riparian Forest and Southern Willow Scrub. Based on the results of the field investigation, no special-status plant communities were observed on-site. Therefore, no special-status plant communities will be impacted by project implementation.

Critical Habitat
Under the federal Endangered Species Act, “Critical Habitat” is designated at the time of listing of a species or within one year of listing. Critical Habitat refers to specific areas within the geographical range of a species at the time it is listed that include the physical or biological features that are essential to the survival and eventual recovery of that species. Maintenance of these physical and biological features requires special management considerations or protection, regardless of whether individuals or the species are present or not. All federal agencies are required to consult with the United States Fish and Wildlife Service (USFWS) regarding activities they authorize, fund, or permit which may affect a federally listed species or its designated Critical Habitat. The purpose of the consultation is to ensure that projects will not jeopardize the continued existence of the listed species or adversely modify or destroy its designated Critical Habitat.

The designation of Critical Habitat does not affect private landowners, unless a project they are proposing is on federal lands, uses federal funds, or requires federal authorization or permits (e.g., funding from the Federal Highways Administration or a CWA Permit from the Corps). If there is a federal nexus, then the federal agency that is responsible for providing the funding or permit would consult with the USFWS.

The project site is not located within federally designated Critical Habitat. The nearest Critical Habitat designation is located approximately 1.02 miles to the northwest for Coastal California gnatcatcher (Polioptila californica californica). Therefore, no impacts to federally designated Critical Habitat will occur from implementation of the proposed project.

Conclusion
Based on literature review and field survey, and existing conditions discussed in this report, implementation of the project will have no significant impacts on federally or State listed species known to occur in the general vicinity of the project site Additionally, the project will have no effect on designated Critical Habitat, or regional wildlife corridors/linkage because none exists within the area. No jurisdictional drainage and/or wetland features were observed on the project site during the field investigation. No further surveys are recommended. With completion of the recommendations provided below, no impacts to yearround, seasonal, or special-status avian residents or special-status species will occur from implementation of the proposed project.

Recommendations
Migratory Bird Treaty Act and Fish and Game Code
Nesting birds are protected pursuant to the Migratory Bird Treaty Act (MBTA) and California Fish and

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Game Code (Sections 3503, 3503.5, 3511, and 3513 prohibit the take, possession, or destruction of birds, their nests or eggs). In order to protect migratory bird species, a nesting bird clearance survey should be conducted prior to any ground disturbance or vegetation removal activities that may disrupt the birds during the nesting season.

If construction occurs between February 1st and August 31st, a pre-construction clearance survey for nesting birds should be conducted within three (3) days of the start of any vegetation removal or ground disturbing activities to ensure that no nesting birds will be disturbed during construction. The biologist conducting the clearance survey should document a negative survey with a brief letter report indicating that no impacts to active avian nests will occur. If an active avian nest is discovered during the pre-construction clearance survey, construction activities should stay outside of a no-disturbance buffer. The size of the no-disturbance buffer will be determined by the wildlife biologist and will depend on the level of noise and/or surrounding anthropogenic disturbances, line of sight between the nest and the construction activity, type and duration of construction activity, ambient noise, species habituation, and topographical barriers. These factors will be evaluated on a case-by-case basis when developing buffer distances. Limits of construction to avoid an active nest will be established in the field with flagging, fencing, or other appropriate barriers; and construction personnel will be instructed on the sensitivity of nest areas. A biological monitor should be present to delineate the boundaries of the buffer area and to monitor the active nest to ensure that nesting behavior is not adversely affected by the construction activity. Once the young have fledged and left the nest, or the nest otherwise becomes inactive under natural conditions, construction activities within the buffer area can occur.

Please do not hesitate to contact Travis McGill at (909) 816-1646 or [email protected] should you have any questions.

Sincerely,
Travis J. McGill | Director Andrew N. Mestas | Associate Biologist Attachments:

A. Project Exhibits
B. Site Photographs
C. Potentially Occurring Special-Status Biological Resources D. Regulations

Attachment A
Project Exhibits

Attachment B
Site Photographs

Attachment B – Site Photographs
Photograph 1: From the northeast corner of the project site, looking south along the eastern boundary.

Photograph 2: From the middle of the northern boundary of the project site, looking south.

Attachment B – Site Photographs
Photograph 3: From the northwest corner of the project site looking east along the northern boundary.

Photograph 4: From the northwest corner of the project site looking south along the western boundary.

Attachment B – Site Photographs
Photograph 5: From the middle of the eastern boundary of the project site, looking south.

Photograph 6: From the southeast corner of the project site looking north along the eastern boundary.

Attachment B – Site Photographs
Photograph 7: From the southwest corner of the project site looking north along the western boundary.

Photograph 8: From the southwest corner of the project site looking east along the southern boundary.

Attachment B – Site Photographs
Photograph 9: Representative photo of the on-site development in the middle of the project site.

Photograph 10: Representative photo of the disturbed areas of the project site.

Attachment C
Potentially Occurring Special-Status Biological Resources

Attachment C – Potentially Occurring Special-Status Biological Resources Table C-1: Potentially Occurring Special-Status Biological Resources Scientific Name
Common Name Status Habitat ObservedOnsite Potential to Occur

SPECIAL-STATUS WILDLIFE SPECIES
Accipiter cooperii
Cooper’s hawk
Fed:

CA:

None
WL
Found in mixed and deciduous forests, open woodlands, small woodlots, riparian woodlands, open and pinyon woodlands, and forested mountainous regions. Nests in more open areas with older, larger trees.

No
Moderate
Suitable foraging habitat is
present within the project site.

Accipiter striatus
sharp-shinned hawk Fed:

CA:

None
WL
Found in mixed or coniferous forests, open deciduous
woodlands, thickets, and forest edges. Usually nests in groves of coniferous trees in mixed woods and sometimes in dense deciduous tress or in pure coniferous forests with brush or clearings nearby. Winters in most types of forests or brushy areas. Avoids open country.

No
Moderate
Suitable foraging habitat is
present within the project site.

Actinemys pallida
southwestern pond turtle
Fed:

CA:

PTHR
None
Found in ponds, marshes, rivers, streams, and irrigation ditches, usually with aquatic vegetation, below 6,000 feet elevation; need basking sites and suitable (sandy banks or grassy open fields) upland habitat up to 0.3 mile from water for egg laying No
Presumed Absent.

No suitable habitat is present
within or adjacent to the
project site.

Agelaius tricolor
tricolored blackbird Fed:

CA:

THR
SSC
Prefers wetland and grassland habitats. Historically nested in cattails, bullrushes, and willows, but has adapted to more agricultural settings with habitat loss. Commonly found in pasturelands, foraging in fields and farms.

No
Presumed Absent.

No suitable habitat is present
within or adjacent to the
project site.

Aimophila ruficeps canescens
southern California rufous-crowned
sparrow
Fed:

CA:

None
WL
Widespread over the coastal lowlands and foothills in sage scrub, broken or burned chaparral, and grassland habitats with scattered shrubs.

No
Presumed Absent.

No suitable habitat is present
within or adjacent to the
project site.

Ammodramus savannarum
grasshopper sparrow Fed:

CA:

None
SSC
Occurs in grasslands, prairies, hayfields, and open pastures with little to no scrub cover and often with bare ground. Winters in grass-dominated fields. Nests in dense grass cover.

No
Presumed Absent.

No suitable habitat is present
within or adjacent to the
project site.

Aquila chrysaetos
Golden eagle
Fed:

CA:

None
None
Occupies nearly all terrestrial habitats of the western states except densely forested areas. Favors secluded cliffs with overhanging ledges and large trees for nesting and cover. Hilly or mountainous country where takeoff and soaring are
supported by updrafts is generally preferred to flat habitats.

Deeply cut canyons rising to open mountain slopes and crags are ideal habitat.

No
Presumed Absent.

No suitable habitat is present
within or adjacent to the
project site.

Attachment C – Potentially Occurring Special-Status Biological Resources Scientific Name
Common Name Status Habitat ObservedOnsite Potential to Occur Ardea alba
great egret Fed:

CA:

None
None
Yearlong resident throughout California, except for the high mountains and deserts. Feeds and rests in fresh, and saline emergent wetlands, along the margins of estuaries, lakes, and slow-moving streams, on mudflats and salt ponds, and in irrigated croplands and pastures.

No
Presumed Absent.

No suitable habitat is present
within or adjacent to the
project site.

Ardea herodias
great blue heron
Fed:

CA:

None
None
Found in both saltwater and freshwater habitats along the open coast, marshes, sloughs, riverbanks, and lakes, to backyard ponds and flooded agricultural fields. Forage in grasslands and fields. Nests high off the ground, usually in tall trees.

No
Presumed Absent.

No suitable habitat is present
within or adjacent to the
project site.

Asio otus
Long-eared owl
Fed:

CA:

None
SSC
Hunts mostly at night over grasslands and other open habitats.

Nesting occurs in dense trees such as oaks and willows where it occupies stick nests of other species, particularly raptors or corvids.

No
Presumed Absent.

No suitable habitat is present
within or adjacent to the
project site.

Aspidoscelis hyperythra
Orange-throated whiptail
Fed:

CA:

None
WL
Semi-arid brushy areas typically with loose soil and rocks, including washes, stream sides, rocky hillsides, and coastal chaparral. They are typically found in hot, dry, flat open spaces.

Typically, they are seen on the ground running in open spots from bush to bush, but rarely climbing on rocks or vegetation.

No
Presumed Absent.

No suitable habitat is present
within or adjacent to the
project site.

Aspidoscelis tigris stejnegeri
coastal whiptail
Fed:

CA:

None
SSC
Found in valley-foothill hardwood, hardwood-conifer, riparian, mixed conifer, pine-juniper, chamise-redshank chaparral, mixed chaparral, desert scrub, desert wash, alkali scrub, and annual grasslands.

No
Presumed Absent.

No suitable habitat is present
within or adjacent to the
project site.

Athene cunicularia
burrowing owl
Fed:

CA:

None
CE
Occurs in dry, open areas such as grasslands, prairies, savannas, deserts, farmlands, golf courses and other urban areas. Usually nests in old burrow of ground squirrel, or other small mammal.

No
Presumed Absent.

No suitable habitat is present
within or adjacent to the
project site.

Bombus crotchii
Crotch bumble bee
Fed:

CA:

None
CE
Exclusive to coastal California east towards the Sierra-Cascade Crest; less common in western Nevada. No
Presumed Absent.

No suitable habitat is present
within or adjacent to the
project site.

Bombus pensylvanicus
American bumble bee
Fed:

CA:

None
None
Prefers farmlands, meadows, grasslands, and open fields. Nests below grass or underground. Feeds on pollen of a wide variety of flowering plants including vetches, clovers, goldenrods, and many crop species.

No
Presumed Absent
There is no suitable habitat
present within the study area.

Calyptae costae
Costa’s hummingbird
Fed:

CA:

None
None
Found in desert scrub in the Sonoran and Mojave deserts and chaparral and sage scrub areas in coastal California. During non-breeding season, found mostly in similar dry habitats and well as parks, gardens, and higher elevation mountains.

No
Presumed Absent.

No suitable habitat is present
within or adjacent to the
project site.

Attachment C – Potentially Occurring Special-Status Biological Resources Scientific Name
Common Name Status Habitat ObservedOnsite Potential to Occur Campylorhynchus brunneicapillus
sandiegensis
coastal cactus wren
Fed:

CA:

None
SSC
Obligate inhabitants of coastal sage scrub. Nests in large cactus or thick shrubs, trees, or thickets. No
Presumed Absent.

No suitable habitat is present
within or adjacent to the
project site.

Chaetura vauxi
Vaux’s swift
Fed:

CA:

None
SSC
Nests and roosts in large hollow trees in mature and old-growth coniferous and mixed forests. Forages over forests, rivers, lakes, fields, and gaps in forests, such as burned areas.

No
Presumed Absent.

No suitable habitat is present
within or adjacent to the
project site.

Circus hudsonius
northern harrier
Fed:

CA:

None
SSC
Found in both wet and dry habitats with good ground cover.

Breed in wide open habitats within prairie grasslands and fields and marshes. Nests on the ground in dense grasses or wetland vegetation.

No
Presumed Absent.

No suitable habitat is present
within or adjacent to the
project site.

Contopus cooperi
olive-sided flycatcher
Fed:

CA:

None
SSC
Can be found in western coniferous forests from sea level to over 10,000 feet in elevation. Occurs commonly in burned forests and other open areas with many dead trees.

No
Presumed Absent.

No suitable habitat is present
within or adjacent to the
project site.

Crotalus ruber
red-diamond rattlesnake
Fed:

CA:

None
SSC
Inhabits arid scrub, coastal chaparral, oak and pine woodlands, rocky grasslands, and cultivated areas. Prefers the desert slopes of mountains and rocky desert flats.

No
Presumed Absent.

No suitable habitat is present
within or adjacent to the
project site.

Diadophis punctatus modestus
San Bernadino ringneck snake
Fed:

CA:

None
SSC
Prefers moist habitats such as wet meadows, rocky hillsides, gardens, farmland, grassland, chaparral, mixed coniferous forests, and woodlands. Found under cover of rocks, wood bark, boards, and other surface debris.

No
Presumed Absent.

No suitable habitat is present
within or adjacent to the
project site.

Elanus leucurus
white-tailed kite
Fed:

CA:

None
FP
Common in savannahs, open woodlands, marshes, desert
grasslands, partially cleared areas, and cultivated fields. Avoids heavily grazed areas. Breeds in lowland grasslands, agricultural wetlands, oak-woodland and savannah habitats, and riparian areas.

No
Presumed Absent.

No suitable habitat is present
within or adjacent to the
project site.

Empidonax traillii
willow flycatcher
Fed:

CA:

None
END
Found near streams or marshes but may be found in drier habitats. Winters around clearings and second growth in the tropics, especially near water. Breeds in thickets of deciduous trees and shrubs, especially willows or along woodland edges.

No
Presumed Absent.

No suitable habitat is present
within or adjacent to the
project site.

Attachment C – Potentially Occurring Special-Status Biological Resources Scientific Name
Common Name Status Habitat ObservedOnsite Potential to Occur Empidonax traillii brewsteri
Little willow flycatcher
Fed:

CA:

None
END
A rare to locally uncommon, summer resident in wet meadow and montane riparian habitats (2,000 to 8,000 feet) in the Sierra Nevada and Cascade Range. Most often occurs in broad, open river valleys or large mountain meadows with lush growth of shrubby willows.

No
Presumed Absent.

No suitable habitat is present
within or adjacent to the
project site.

Empidonax traillii extimus
Southwestern willow flycatcher
Fed:

CA:

END
END
Occurs in riparian woodlands in southern California. Typically requires large areas of willow thickets in broad valleys, canyon bottoms, or around ponds and lakes. These areas typically have standing or running water or are at least moist.

No
Presumed Absent.

No suitable habitat is present
within or adjacent to the
project site.

Eremophila alpestris actia
California horned lark
Fed:

CA:

None
None
Inhabits open ground, generally avoiding areas with trees and bushes. Found in short-grass prairies, extensive lawns, plowed fields, stubble fields, beaches, lake flats, or high mountains.

No
Presumed Absent.

No suitable habitat is present
within or adjacent to the
project site.

Eumops perotis californicus
western mastiff bat Fed:

CA:

None
SSC
Primarily a cliff-dwelling species, roost generally under exfoliating rock slabs. Roosts are generally high above the ground, usually allowing a clear vertical drop of at least three meters below the entrance for flight. In California, it is most frequently encountered in broad open areas. Its foraging habitat includes dry desert washes, flood plains, chaparral, oak woodland, open ponderosa pine forest, grassland, and
agricultural areas.

No
Presumed Absent.

No suitable habitat is present
within or adjacent to the
project site.

Glyptostoma gabrielense
San Gabriel chestnut Fed:

CA:

None
None
Restricted to the San Gabriel Mountains, part of the Transverse Ranges situated between the Los Angeles Basin and the Mojave Desert.

No
Presumed Absent.

No suitable habitat is present
within or adjacent to the
project site.

Haliaeetus leucocephalus
Bald eagle
Fed:

CA:

DL
END
Occur primarily at or near seacoasts, rivers, swamps, and large lakes. Need ample foraging opportunities, typically near a large water source.

No
Presumed Absent.

No suitable habitat is present
within or adjacent to the
project site.

Icteria virens
yellow-breasted chat
Fed:

CA:

None
SSC
Primarily found in tall, dense, relatively wide riparian woodlands and thickets of willows, vine tangles, and dense brush with well-developed understories. Nesting areas are associated with streams, swampy ground, and the borders of small ponds. Breeding habitat must be dense to provide shade and concealment. It winters south the Central America.

No
Presumed Absent.

No suitable habitat is present
within or adjacent to the
project site.

Attachment C – Potentially Occurring Special-Status Biological Resources Scientific Name
Common Name Status Habitat ObservedOnsite Potential to Occur Lanius ludovicianus
loggerhead shrike
Fed:

CA:

None
SSC
Inhabits open country with short vegetation and well-spaced shrubs or low trees, particularly those with spines or thorns.

Common in agricultural fields, pastures, old orchards, riparian areas, desert scrublands, savannahs, prairies, golf courses, and cemeteries.

No
Presumed Absent.

No suitable habitat is present
within or adjacent to the
project site.

Lasiurus blossevillii
western red bat
Fed:

CA:

None
None
Common in edge habitats adjacent to streams or open fields.

Can sometimes be found in orchards an urban areas. Prefers riparian areas dominated by walnuts, oaks, willows,
cottonwoods, and sycamores for roosting.

No
Presumed Absent.

No suitable habitat is present
within or adjacent to the
project site.

Laterallus jamaicensis coturniculus
California black rail
Fed:

CA:

None

THR, FP
Occurs in salt marshes, freshwater marshes, and wet meadows.

Requires dense cover of upland vegetation to provide protection from predators.

No
Presumed Absent.

No suitable habitat is present
within or adjacent to the
project site.

Nannopterum auritum
double-crested cormorant
Fed:

CA:

None
WL
Found along coasts, in bays, lakes, rivers, and estuaries, along with most aquatic habitats. Nests in trees near or over water, on sea cliffs, or on the ground on islands.

No
Presumed Absent.

No suitable habitat is present
within or adjacent to the
project site.

Phrynosoma blainvillii
coast horned lizard
Fed:

CA:

None
SSC
Found in a wide variety of vegetation types including coastal sage scrub, annual grassland, chaparral, oak woodland, riparian woodland and coniferous forest. The key elements of such habitats are loose, fine soils with a high sand fraction; an abundance of native ants or other insects; and open areas with limited overstory for basking and low, but relatively dense shrubs for refuge.

No
Presumed Absent.

No suitable habitat is present
within or adjacent to the
project site.

Polioptila californica californica
coastal California gnatcatcher
Fed:

CA:

THR
SSC
Obligate resident of sage scrub habitats that are dominated by California sagebrush (Artemisia californica). This species generally occurs below 750 feet elevation in coastal regions and below 1,500 feet inland. It prefers habitat with more lowgrowing vegetation.

No
Presumed Absent.

No suitable habitat is present
within or adjacent to the
project site.

Pyrocephalus rubinus
vermilion flycatcher
Fed:

CA:

None
SSC
Occupies desert riparian habitat, particularly cottonwoods, willows, mesquite, and other large desert riparian trees, in habitat adjacent to irrigated fields, irrigation ditches, pastures, and other open, mesic areas where it can forage.

No
Presumed Absent.

No suitable habitat is present
within or adjacent to the
project site.

Salvadora hexalepis virgultea
Coast patch-nosed snake
Fed:

CA:

None
None
Inhabits semi-arid brushy areas and chaparral in canyons, rocky hillsides, and plains. Requires friable soils for burrowing. No Presumed Absent.

No suitable habitat is present
within or adjacent to the
project site.

Attachment C – Potentially Occurring Special-Status Biological Resources Scientific Name
Common Name Status Habitat ObservedOnsite Potential to Occur Selasphorus rufus
rufous hummingbird
Fed:

CA:

None
None
Breeds in open or shrubby areas, forest openings, yards, parks, and sometimes forests, thickets, swamps, and meadows from sea level to about 6,000 feet in elevation.

No
Presumed Absent.

No suitable habitat is present
within or adjacent to the
project site.

Setophaga petechia
yellow warbler
Fed:

CA:

None
SSC
Nests over all of California except the Central Valley, the Mojave Desert region, and high altitudes and the eastern side of the Sierra Nevada. Winters along the Colorado River and in parts of Imperial and Riverside Counties. Nests in riparian areas dominated by willows, cottonwoods, sycamores, or alders or in mature chaparral. May also use oaks, conifers, and urban areas near stream courses.

No
Presumed Absent.

No suitable habitat is present
within or adjacent to the
project site.

Thamnophis hammondii
south coast gartersnake
Fed:

CA:

None
None
Found in areas with permanent water, low gradient topography, and dense multistoried riparian vegetation. Restricted to shallow, freshwater aquatic habitats such as wetlands and marshes. Requires open water for foraging.

No
Presumed Absent.

No suitable habitat is present
within or adjacent to the
project site.

Vireo bellii pusillus
least Bell’s vireo
Fed:

CA:

END
END
Inhabits low-elevation riparian habitats with a dense shrub understory near water. Prefers an area with both a canopy and shrub layer. Prefers to nest in willows, but will use other shrubs, trees, and vines. Found below 2,000 feet elevation.

No
Presumed Absent.

No suitable habitat is present
within or adjacent to the
project site.

SPECIAL-STATUS PLANT SPECIES
Calochortus weedii var. intermedius
intermediate mariposa-lily
Fed:

CA:

CNPS:

None
None
1B.2
Found in coastal and peninsular ranges, Grows in heavy rocky soils from sea level to 6,200 feet. Blooms from June to July. No Presumed Absent.

No suitable habitat is present
within or adjacent to the
project site.

Eriastrum densifolium ssp. sanctorum
Santa Ana River woollystar
Fed:

CA:

CNPS:

END
END
1B.1
Gravelly (sometimes), Sandy (sometimes); Chaparral, Coastal scrub (alluvial fans); Elevation range: 300 to 2000 feet; Blooming period: Apr-Sep.

No
Presumed Absent.

No suitable habitat is present
within or adjacent to the
project site.

Juglans californica
southern California black walnut
Fed:

CA:

CNPS:

None
None

4.2 Occurs in alluvial soils in chaparral, cismontane woodland, coastal scrub, and riparian woodlands. From 15 to 5,875 feet in elevation. Blooming period is from May to June.

No
Presumed Absent.

No suitable habitat is present
within or adjacent to the
project site.

Lepidium virginicum var. robinsonii
Robinsons pepper-grass
Fed:

CA:

CNPS:

None
None

4.3 Chaparral, Coastal scrub; Elevation range: 5 to 2905 feet; Blooming period: Jan-Jul. No
Presumed Absent.

No suitable habitat is present
within or adjacent to the
project site.

Attachment C – Potentially Occurring Special-Status Biological Resources Scientific Name
Common Name Status Habitat ObservedOnsite Potential to Occur Microseris douglasii ssp. platycarpha
small-flowered microseris
Fed:

CA:

CNPS:

None
None

4.2 Grows in clay soils within cismontane woodland, coastal scrub, valley and foothill grasslands, and vernal pool habitats. Found at elevations ranging from 50 to 3,500 feet. Blooming period is from March to May.

No
Presumed Absent.

No suitable habitat is present
within or adjacent to the
project site.

Phacelia hubbyi
Hubbys phacelia
Fed:

CA:

CNPS:

None
None

4.2 Grows in rocky or sandy soils in chaparral, coastal sage scrub, or oak woodland habitats. Found at elevations from sea level to approximately 5,000 feet. Blooming period is from March to June.

No
Presumed Absent.

No suitable habitat is present
within or adjacent to the
project site.

Quercus engelmannii
Engelmann oak
Fed:

CA:

CNPS:

None
None

4.2 Grows along the foothills from Pasadena through Baja California. Requires elevations of 500 to 4,000 feet. Found in mesas, savannas, and woodlands above the dry coastal plain.

No
Presumed Absent.

No suitable habitat is present
within or adjacent to the
project site.

Romneya coulteri
Coulters matilija poppy
Fed:

CA:

CNPS:

None
None

4.2 Grows in dry canyons, slopes, and sandy washes within chaparral and coastal sage scrub plant communities below 4000 feet. Can also be found in recently burned areas. Common as an ornamental choice in gardens and parks. Blooms from March to August.

No
Presumed Absent.

No suitable habitat is present
within or adjacent to the
project site.

SPECIAL-STATUS PLANT COMMUNITIES
California Walnut Woodland CDFW Sensitive
Habitat
Includes species such as live oak (Quercus virginiana), toyon (Heteromeles arbutifolia), and southern California black walnut (Juglans californica). Contains mostly shrubs and very few woody tree species with a dominant grass understory. Occurs in valleys and on south-facing slopes.

No Absent
Southern Coast Live Oak Riparian Forest CDFW
Sensitive Habitat
Open to locally dense evergreen riparian woodlands dominated by Quercus agrifolia. This type appears to be richer in herbs and poorer in understory shrubs than other riparian communities.

Bottomlands and outer floodplains along larger streams, on fine-grained, rich alluvium. Canyons and valleys of coastal southern California.

No Absent
Southern Willow Scrub CDFW
Sensitive Habitat
Occurs on loose, sandy, or fine, gravelly alluvium deposited near stream channels during flood flows. Characterized by frequent flooding which prevents succession of riparian woodland or forest. Generally along stream banks, benches, slope seeps, rivers, broad drainages, and floodplains.

No Absent

Attachment C – Potentially Occurring Special-Status Biological Resources U.S. Fish and Wildlife Service
(USFWS) - Federal
END- Federal Endangered
THR- Federal Threatened
Candidate END – Under Review
California Department of Fish
and Wildlife (CDFW) - California
END- California Endangered
SSC- California Species of Concern
WL- Watch List
FP- California Fully Protected
California Native Plant Society (CNPS)
California Rare Plant Rank
1A- Plants Presumed Extirpated in California and
Either Rare or Extinct Elsewhere
1B- Plants Rare, Threatened, or Endangered in
California and Elsewhere
2B- Plants Rare, Threatened, or Endangered in
California, but More Common Elsewhere
4- Plants of Limited Distribution – A Watch List
Threat Ranks

0.1- Seriously threatened in
California

0.2- Moderately threatened
in California

0.3- Not very threatened in
California

Attachment D
Potentially Occurring Special-Status Biological Resources

Attachment D – Regulations
Special status species are native species that have been afforded special legal or management protection because of concern for their continued existence. There are several categories of protection at both federal and state levels, depending on the magnitude of threat to continued existence and existing knowledge of population levels.

Federal Regulations
Endangered Species Act of 1973
Federally listed threatened and endangered species and their habitats are protected under provisions of the Federal Endangered Species Act (ESA). Section 9 of the ESA prohibits “take” of threatened or endangered species. “Take” under the ESA is defined as to “harass, harm, pursue, hunt, shoot, wound, kill, trap, capture, or collect, or to attempt to engage in any of the specifically enumerated conduct.” The presence of any federally threatened or endangered species that are in a project area generally imposes severe constraints on development, particularly if development would result in “take” of the species or its habitat. Under the regulations of the ESA, the United States Fish and Wildlife Service (USFWS) may authorize “take” when it is incidental to, but not the purpose of, an otherwise lawful act.

Critical Habitat is designated for the survival and recovery of species listed as threatened or endangered under the ESA. Critical Habitat includes those areas occupied by the species, in which are found physical and biological features that are essential to the conservation of an ESA listed species and which may require special management considerations or protection. Critical Habitat may also include unoccupied habitat if it is determined that the unoccupied habitat is essential for the conservation of the species.

Whenever federal agencies authorize, fund, or carry out actions that may adversely modify or destroy Critical Habitat, they must consult with USFWS under Section 7 of the ESA. The designation of Critical Habitat does not affect private landowners, unless a project they are proposing uses federal funds, or requires federal authorization or permits (e.g., funding from the Federal Highway Administration or a permit from the U.S. Army Corps of Engineers (Corps)).

If USFWS determines that Critical Habitat will be adversely modified or destroyed from a proposed action, the USFWS will develop reasonable and prudent alternatives in cooperation with the federal institution to ensure the purpose of the proposed action can be achieved without loss of Critical Habitat. If the action is not likely to adversely modify or destroy Critical Habitat, USFWS will include a statement in its biological opinion concerning any incidental take that may be authorized and specify terms and conditions to ensure the agency is in compliance with the opinion.

Migratory Bird Treaty Act
The Migratory Bird Treaty Act (MBTA) (16 U.S. Government Code [USC] 703) makes it unlawful to pursue, capture, kill, possess, or attempt to do the same to any migratory bird or part, nest, or egg of any such bird listed in wildlife protection treaties between the United States, Great Britain, Mexico, Japan, and the countries of the former Soviet Union, and authorizes the U.S. Secretary of the Interior to protect and regulate the taking of migratory birds. It establishes seasons and bag limits for hunted species and protects migratory birds, their occupied nests, and their eggs (16 USC 703; 50 CFR 10, 21).

Attachment D – Regulations
The MBTA covers the taking of any nests or eggs of migratory birds, except as allowed by permit pursuant to 50 CFR, Part 21. Disturbances causing nest abandonment and/or loss of reproductive effort (i.e., killing or abandonment of eggs or young) may also be considered “take.” This regulation seeks to protect migratory birds and active nests.

In 1972, the MBTA was amended to include protection for migratory birds of prey (e.g., raptors). Six families of raptors occurring in North America were included in the amendment: Accipitridae (kites, hawks, and eagles); Cathartidae (New World vultures); Falconidae (falcons and caracaras); Pandionidae (ospreys); Strigidae (typical owls); and Tytonidae (barn owls). The provisions of the 1972 amendment to the MBTA protects all species and subspecies of the families listed above. The MBTA protects over 800 species including geese, ducks, shorebirds, raptors, songbirds and many relatively common species.

State Regulations
California Environmental Quality Act (CEQA)
The California Environmental Quality Act (CEQA) provides for the protection of the environment within the State of California by establishing State policy to prevent significant, avoidable damage to the environment through the use of alternatives or mitigation measures for projects. It applies to actions directly undertaken, financed, or permitted by State lead agencies. If a project is determined to be subject to CEQA, the lead agency will be required to conduct an Initial Study (IS); if the IS determines that the project may have significant impacts on the environment, the lead agency will subsequently be required to write an Environmental Impact Report (EIR). A finding of non-significant effects will require either a Negative Declaration or a Mitigated Negative Declaration instead of an EIR. Section 15380 of the CEQA Guidelines independently defines “endangered” and “rare” species separately from the definitions of the California Endangered Species Act (CESA). Under CEQA, “endangered” species of plants or animals are defined as those whose survival and reproduction in the wild are in immediate jeopardy, while “rare” species are defined as those who are in such low numbers that they could become endangered if their environment worsens.

California Endangered Species Act (CESA)
In addition to federal laws, the state of California implements the CESA which is enforced by CDFW. The CESA program maintains a separate listing of species beyond the FESA, although the provisions of each act are similar.

State-listed threatened and endangered species are protected under provisions of the CESA. Activities that may result in “take” of individuals (defined in CESA as; “hunt, pursue, catch, capture, or kill, or attempt to hunt, pursue, catch, capture, or kill”) are regulated by CDFW. Habitat degradation or modification is not included in the definition of “take” under CESA. Nonetheless, CDFW has interpreted “take” to include the destruction of nesting, denning, or foraging habitat necessary to maintain a viable breeding population of protected species.

The State of California considers an endangered species as one whose prospects of survival and reproduction are in immediate jeopardy. A threatened species is considered as one present in such small numbers throughout its range that it is likely to become an endangered species in the near future in the

Attachment D – Regulations
absence of special protection or management. A rare species is one that is considered present in such small numbers throughout its range that it may become endangered if its present environment worsens. State threatened and endangered species are fully protected against take, as defined above.

The CDFW has also produced a species of special concern list to serve as a species watch list. Species on this list are either of limited distribution or their habitats have been reduced substantially, such that a threat to their populations may be imminent. Species of special concern may receive special attention during environmental review, but they do not have formal statutory protection. At the federal level, USFWS also uses the label species of concern, as an informal term that refers to species which might be in need of concentrated conservation actions. As the Species of Concern designated by USFWS do not receive formal legal protection, the use of the term does not necessarily ensure that the species will be proposed for listing as a threatened or endangered species.

Fish and Game Code
Fish and Game Code Sections 3503, 3503.5, 3511, and 3513 are applicable to natural resource management.

For example, Section 3503 of the Code makes it unlawful to destroy any birds’ nest or any birds’ eggs that are protected under the MBTA. Further, any birds in the orders Falconiformes or Strigiformes (Birds of Prey, such as hawks, eagles, and owls) are protected under Section 3503.5 of the Fish and Game Code which makes it unlawful to take, possess, or destroy their nest or eggs. A consultation with CDFW may be required prior to the removal of any bird of prey nest that may occur on a project site. Section 3511 of the Fish and Game Code lists fully protected bird species, where the CDFW is unable to authorize the issuance of permits or licenses to take these species. Pertinent species that are State fully protected by the State include golden eagle (Aquila chrysaetos) and white-tailed kite (Elanus leucurus). Section 3513 of the Fish and Game Code makes it unlawful to take or possess any migratory nongame bird as designated in the MBTA or any part of such migratory nongame bird except as provided by rules and regulations adopted by the Secretary of the Interior under provisions of the MBTA.

Native Plant Protection Act
Sections 1900–1913 of the Fish and Game Code were developed to preserve, protect, and enhance Rare and Endangered plants in the state of California. The act requires all state agencies to use their authority to carry out programs to conserve Endangered and Rare native plants. Provisions of the Native Plant Protection Act prohibit the taking of listed plants from the wild and require notification of the CDFW at least ten days in advance of any change in land use which would adversely impact listed plants. This allows the CDFW to salvage listed plant species that would otherwise be destroyed.

California Native Plant Society Rare and Endangered Plant Species Vascular plants listed as rare or endangered by the CNPS, but which have no designated status under FESA or CESA are defined as follows:

California Rare Plant Rank
1A- Plants Presumed Extirpated in California and either Rare or Extinct Elsewhere 1B- Plants Rare, Threatened, or Endangered in California and Elsewhere

Attachment D – Regulations
2A- Plants Presumed Extirpated in California, But More Common Elsewhere 2B- Plants Rare, Threatened, or Endangered in California, But More Common Elsewhere 3- Plants about Which More Information is Needed - A Review List 4- Plants of Limited Distribution - A Watch List
Threat Ranks
.1- Seriously threatened in California (over 80% of occurrences threatened / high degree and immediacy of threat)
.2- Moderately threatened in California (20-80% occurrences threatened / moderate degree and immediacy of threat)
.3- Not very threatened in California (<20% of occurrences threatened / low degree and immediacy of threat or no current threats known).

Attachment D – Regulations
There are three key agencies that regulate activities within inland streams, wetlands, and riparian areas in California. The Corps Regulatory Branch regulates activities pursuant to Section 404 of the Federal Clean Water Act (CWA) and Section 10 of the Rivers and Harbors Act. Of the State agencies, the CDFG regulates activities under the Fish and Game Code Section 1600-1616, and the Regional Board regulates activities pursuant to Section 401 of the CWA and the California Porter-Cologne Water Quality Control Act.

Federal Regulations
Section 404 of the Clean Water Act
In accordance with the Revised Definition of “Waters of the United States”; Conforming (September 8, 2023), “waters of the United Sates” are defined as follows:
(a) Waters of the United States means:
(1) Waters which are:
(i) Currently used, or were used in the past, or may be susceptible to use in interstate or foreign commerce, including all waters which are subject to the ebb and flow of the tide; (ii) The territorial seas; or
(iii) Interstate waters;
(2) Impoundments of waters otherwise defined as waters of the United States under this definition, other than impoundments of waters identified under paragraph (a)(5) of this section; (3) Tributaries of waters identified in paragraph (a)(1) or (2) of this section that are relatively permanent, standing or continuously flowing bodies of water; (4) Wetlands adjacent to the following waters:
(i) Waters identified in paragraph (a)(1) of this section; or (ii) Relatively permanent, standing or continuously flowing bodies of water identified in paragraph (a)(2) or (a)(3) of this section and with a continuous surface connection to those waters; (5) Intrastate lakes and ponds not identified in paragraphs (a)(1) through (4) of this section that are relatively permanent, standing or continuously flowing bodies of water with a continuous surface connection to the waters identified in paragraph (a)(1) or (a)(3) of this section (b) The following are not “waters of the United States” even where they otherwise meet the terms of paragraphs (a)(2) through (5) of this section:
(1) Waste treatment systems, including treatment ponds or lagoons, designed to meet the requirements of the Clean Water Act;
(2) Prior converted cropland designated by the Secretary of Agriculture. The exclusion would cease upon a change of use, which means that the area is no longer available for the production of agricultural commodities. Notwithstanding the determination of an area's status as prior converted

Attachment D – Regulations
cropland by any other Federal agency, for the purposes of the Clean Water Act, the final authority regarding Clean Water Act jurisdiction remains with EPA; (3) Ditches (including roadside ditches) excavated wholly in and draining only dry land and that do not carry a relatively permanent flow of water;
(4) Artificially irrigated areas that would revert to dry land if the irrigation ceased; (5) Artificial lakes or ponds created by excavating or diking dry land to collect and retain water and which are used exclusively for such purposes as stock watering, irrigation, settling basins, or rice growing;
(6) Artificial reflecting or swimming pools or other small ornamental bodies of water created by excavating or diking dry land to retain water for primarily aesthetic reasons; (7) Waterfilled depressions created in dry land incidental to construction activity and pits excavated in dry land for the purpose of obtaining fill, sand, or gravel unless and until the construction or excavation operation is abandoned and the resulting body of water meets the definition of waters of the United States; and
(8) Swales and erosional features (e.g., gullies, small washes) characterized by low volume, infrequent, or short duration flow.
(c) In this section, the following definitions apply:
(1) Wetlands means those areas that are inundated or saturated by surface or ground water at a frequency and duration sufficient to support, and that under normal circumstances do support, a prevalence of vegetation typically adapted for life in saturated soil conditions. Wetlands generally include swamps, marshes, bogs, and similar areas.
(2) Adjacent means having a continuous surface connection (3) High tide line means the line of intersection of the land with the water's surface at the maximum height reached by a rising tide. The high tide line may be determined, in the absence of actual data, by a line of oil or scum along shore objects, a more or less continuous deposit of fine shell or debris on the foreshore or berm, other physical markings or characteristics, vegetation lines, tidal gages, or other suitable means that delineate the general height reached by a rising tide. The line encompasses spring high tides and other high tides that occur with periodic frequency but does not include storm surges in which there is a departure from the normal or predicted reach of the tide due to the piling up of water against a coast by strong winds such as those accompanying a hurricane or other intense storm.
(4) Ordinary high water mark means that line on the shore established by the fluctuations of water and indicated by physical characteristics such as clear, natural line impressed on the bank, shelving, changes in the character of soil, destruction of terrestrial vegetation, the presence of litter and debris, or other appropriate means that consider the characteristics of the surrounding areas.

Attachment D – Regulations
(5) Tidal waters means those waters that rise and fall in a predictable and measurable rhythm or cycle due to the gravitational pulls of the moon and sun. Tidal waters end where the rise and fall of the water surface can no longer be practically measured in a predictable rhythm due to masking by hydrologic, wind, or other effects.

Section 401 of the Clean Water Act
Pursuant to Section 401 of the CWA, any applicant for a federal license or permit to conduct any activity which may result in any discharge to waters of the United States must provide certification from the State or Indian tribe in which the discharge originates. This certification provides for the protection of the physical, chemical, and biological integrity of waters, addresses impacts to water quality that may result from issuance of federal permits, and helps insure that federal actions will not violate water quality standards of the State or Indian tribe. In California, there are nine Regional Water Quality Control Boards (Regional Board) that issue or deny certification for discharges to waters of the United States and waters of the State, including wetlands, within their geographical jurisdiction. The State Water Resources Control Board assumed this responsibility when a project has the potential to result in the discharge to waters within multiple Regional Boards.

State Regulations
Fish and Game Code
Fish and Game Code Sections 1600 et. seq. establishes a fee-based process to ensure that projects conducted in and around lakes, rivers, or streams do not adversely impact fish and wildlife resources, or, when adverse impacts cannot be avoided, ensures that adequate mitigation and/or compensation is provided.

Fish and Game Code Section 1602 requires any person, state, or local governmental agency or public utility to notify the CDFW before beginning any activity that will do one or more of the following:
(1) substantially obstruct or divert the natural flow of a river, stream, or lake; (2) substantially change or use any material from the bed, channel, or bank of a river, stream, or lake; or
(3) deposit or dispose of debris, waste, or other material containing crumbled, flaked, or ground pavement where it can pass into a river, stream, or lake.

Fish and Game Code Section 1602 applies to all perennial, intermittent, and ephemeral rivers, streams, and lakes in the State. CDFW’s regulatory authority extends to include riparian habitat (including wetlands) supported by a river, stream, or lake regardless of the presence or absence of hydric soils and saturated soil conditions. Generally, the CDFW takes jurisdiction to the top of bank of the stream or to the outer limit of the adjacent riparian vegetation (outer drip line), whichever is greater. Notification is generally required for any project that will take place in or in the vicinity of a river, stream, lake, or their tributaries. This includes rivers or streams that flow at least periodically or permanently through a bed or channel with banks that support fish or other aquatic life and watercourses having a surface or subsurface flow that support or have supported riparian vegetation. A Section 1602 Streambed Alteration Agreement would be required if impacts to identified CDFW jurisdictional areas occur.

Attachment D – Regulations
Porter Cologne Act
The California Porter-Cologne Water Quality Control Act gives the State very broad authority to regulate waters of the State, which are defined as any surface water or groundwater, including saline waters. The Porter-Cologne Act has become an important tool in the post SWANCC and Rapanos regulatory environment, with respect to the state’s authority over isolated and insignificant waters. Generally, any person proposing to discharge waste into a water body that could affect its water quality must file a Report of Waste Discharge in the event that there is no Section 404/401 nexus. Although “waste” is partially defined as any waste substance associated with human habitation, the Regional Board also interprets this to include fill discharged into water bodies.