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Mitigation Monitoring & Reporting Program
for the
CITY OF DIAMOND BAR GENERAL PLAN 2040 AND CLIMATE
ACTION PLAN 2040 ENVIRONMENTAL IMPACT REPORT
SCH No. 2018051066
City of Diamond Bar
November 2019
Mitigation Monitoring and Reporting Program for the City of Diamond Bar General Plan 2040 and Climate
Action Plan 2040
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Mitigation Monitoring and Reporting Program for the City of Diamond Bar General Plan 2040 and Climate
Action Plan 2040
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1 Purpose
State of California Public Resources Code Section 21081.6(a)(1) requires a lead or responsible
agency that approves or carries out a project where an Environmental Impact Report (EIR) has
identified significant environmental effects to adopt a reporting or monitoring program for the
changes made to the project or conditions of project approval, adopted in order to mitigate or avoid
significant effects on the environment. The City of Diamond Bar (the "City") is the lead agency for
the EIR prepared for the City of Diamond Bar General Plan 2040 and Climate Action Plan 2040
(SCH No. 2018051066 Project and therefore is responsible for
the adoption and implementation of the required mitigation monitoring and reporting program.
An EIR has been prepared for the Proposed Project that addresses potential environmental impacts
and, where appropriate, recommends measures to mitigate these impacts.
The Mitigation Monitoring and Reporting Program (MMRP) has been prepared in conformance
with Public Resources Code Section 21081.6(a)(1). It is the intent of this program to:
1. Verify satisfaction of the required mitigation measures of the EIR;
2. Provide a methodology to document implementation of the required mitigation;
3. Provide a record of the monitoring program;
4. Identify monitoring responsibility;
5. Establish administrative procedures for the clearance of mitigation measures;
6. Establish the frequency and duration of monitoring; and
7. Utilize existing review processes wherever feasible.
The MMRP describes the procedures that will be used to implement the mitigation measures
adopted in connection with the approval of the Proposed Project and the methods of monitoring
such actions. A monitoring program is necessary only for impacts which would be significant if not
mitigated.
If, during the course of project implementation, any of the mitigation measures identified cannot
be successfully implemented, the City shall immediately inform any affected responsible agencies.
The City, in conjunction with any affected responsible agencies, will then determine if modification
to the project is required, and/or whether alternative mitigation is appropriate.
The following consists of a monitoring program table noting the responsible entity for mitigation
monitoring, the timing, and a list of all project-related mitigation measures.
Mitigation Monitoring and Reporting Program for the City of Diamond Bar General Plan 2040 and Climate
Action Plan 2040
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Mitigation Monitoring and Reporting Program for the City of Diamond Bar General Plan 2040 and Climate Action Plan 2040
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2 Mitigation Monitoring and Reporting Plan
Impact Mitigation Measure Method of Verification Timing of
Verification
Responsibility for
Verification
Verification Complete
Date Initial
Air Quality
Construction associated
with implementation of
the Proposed Project
would create new
sources of VOC and
NOx emissions that
exceeds SCAQMD
project-level thresholds
and contribute to the
nonattainment
designation of the South
Coast Air Basin for O3.
MM-AQ-1 Construction Features.
Future development projects
implemented under the General Plan
will be required to demonstrate
consistency with SCAQMD
construction emission thresholds.
Where emissions from individual
projects exceed SCAQMD thresholds,
the following measures shall be
incorporated as necessary to minimize
impacts. These measures do not exclude
the use of other, equally effective
mitigation measures.
• Require all off-road diesel equipment
greater than 50 horsepower (hp)
used for this Project to meet current
USEPA standards, which are
currently Tier 4 final off-road
emission standards or equivalent.
Such equipment shall be outfitted
with Best Available Control
Technology (BACT) devices
including a California Air Resources
Include in project
conditions of
approval.
Prior to
issuance of
construction
permit.
City of
Diamond Bar
Community
Development
Department
Mitigation Monitoring and Reporting Program for the City of Diamond Bar General Plan 2040 and Climate Action Plan 2040
4
Impact Mitigation Measure Method of Verification Timing of
Verification
Responsibility for
Verification
Verification Complete
Date Initial
Board certified Level 3 Diesel
Particulate Filter (DPF) or equivalent.
This DPF will reduce diesel
particulate matter and NOX
emissions during construction
activities.
• Require a minimum of 50 percent of
construction debris be diverted for
recycling.
• Require building materials to contain
a minimum 10 percent recycled
content.
• Require materials such as paints,
primers, sealants, coatings, and glues
to have a low volatile organic
compound concentration compared
to conventional products. If low
VOC materials are not available,
architectural coating phasing should
be extended sufficiently to reduce
the daily emissions of VOCs.
Operational sources
under the Proposed
Project would generate
emissions of VOC, NOx,
CO, PM10, and PM2.5 that
exceeds SCAQMD
project-level thresholds
and contribute to the
nonattainment
designation of the SCAB
for O3, PM2.5, and PM10.
MM-AQ-2: Future development.
Under the Proposed Project, future
development would be required to
demonstrate consistency with
projects where operational emissions
exceed regulatory thresholds the
following measures may be used to
reduce impacts. Note the following
measures are not all inclusive and
developers have the option to add or
substitute measures that are equally or
Include in project
conditions of
approval.
Prior to
discretionary
project
approval.
Construction
contractor;
City of
Diamond Bar
Community
Development
Department
Mitigation Monitoring and Reporting Program for the City of Diamond Bar General Plan 2040 and Climate Action Plan 2040
5
Impact Mitigation Measure Method of Verification Timing of
Verification
Responsibility for
Verification
Verification Complete
Date Initial
more appropriate for the scope of their
project.
• Develop a project specific TDM
program for residents and/or
employees that provides
opportunities for carpool/vanpools.
• Provide onsite solar/renewable
energy in excess of regulatory
requirements.
• Require that owners/tenants of non-
residential or multi-family residential
developments use architectural
coatings that are 10 grams per liter
or less when repainting/repairing
properties.
• Require dripless irrigation and
irrigation sensor units that prevent
watering during rain storms.
• Ensure all parking areas are wired
capability of future EV charging and
include EV charging stations that
exceed regulatory requirements.
Biological Resources
Construction associated
with implementation of
the Proposed Project
could have an adverse
effect on special-status
plant species.
MM-BIO-1A Preconstruction
Surveys for Special-Status Plants:
To mitigate impacts on special status
plant species, the applicant shall
implement the following measures:
• Prior to initiating disturbance
activities, clearance surveys for
special-status plant species shall be
performed by a qualified biologist(s)
Submittal of
preconstruction
surveys.
Prior to
issuance of
construction
permit.
Construction
contractor;
City of
Diamond Bar
Community
Development
Department
Mitigation Monitoring and Reporting Program for the City of Diamond Bar General Plan 2040 and Climate Action Plan 2040
6
Impact Mitigation Measure Method of Verification Timing of
Verification
Responsibility for
Verification
Verification Complete
Date Initial
within the boundaries of the future
project disturbances. If any special-
status plants are found on the
Planning Area, a qualified biologist(s)
with a CDFG Scientific Collection
Permit shall prepare a plan to
relocate these species to suitable
habitats within surrounding public
open space areas that would remain
undisturbed. For those species that
cannot be physically transplanted, the
biologist(s) shall collect seeds from
the plants. (Note: Lilies generally can
be transplanted in bulb-form.)
• To the extent feasible the
preconstruction surveys shall be
completed when species are in
bloom, typically between May and
June and reference populations
checked. Two species, the white
rabbit-tobacco and San Bernardino
aster, are perennial herbs that grow
up to three feet in height and can be
identified by their dried stalks and
leaves following their blooming
period.
Construction associated
with implementation of
the Proposed Project
could have an adverse
effect on special-status
plant species.
MM-BIO-1B Special-Status Plant
Planting Plan: Prior to any ground
disturbance for projects that have the
potential to cause direct or indirect
impacts on special-status plants, the
project applicants shall prepare a Special
Status Plant Planting Plan for the species
Submittal of Special
Status Plant Planting
Plan and appropriate
documentation.
Prior to start
of ground
disturbance
activities.
Construction
contractor;
City of
Diamond Bar
Community
Development
Department
Mitigation Monitoring and Reporting Program for the City of Diamond Bar General Plan 2040 and Climate Action Plan 2040
7
Impact Mitigation Measure Method of Verification Timing of
Verification
Responsibility for
Verification
Verification Complete
Date Initial
to be transplanted. At a minimum, the
plan shall include a description of the
existing conditions of the project and
receiver site(s), transplanting and/or
seed collection/off-site seeding or
installation methods, an adaptive two-
year monitoring program, any other
necessary monitoring procedures, plant
spacing, and maintenance requirements.
In the event that the City of Diamond
Bar determines that agreed success
criteria are not met, additional
remediation may be required beyond
the two-year maintenance/monitoring
period to ensure mitigation
requirements are met. The City shall
also require proof that the plan
preparer consulted with US Fish and
Wildlife Service and California
Department of Fish and Wildlife
personnel or appropriate herbarium
botanists in order to maximize
transplanting success. (Note:
Appropriate botanists include those at
CDFW in Ontario, the Rancho Santa
Ana Botanical Gardens in Claremont,
UC Riverside, or Cal Poly Pomona.)
Construction associated
with implementation of
the Proposed Project
could have an adverse
effect on special-status
plant species.
MM-BIO-1C Listed Endangered
and Threatened Plants: In addition
to MM BIO-1A and -1B, the City shall
require the project applicant to provide
proof of the US Fish and Wildlife
Service and California Department of
Fish and Wildlife permitting the take of
Submittal of USFWS
and CDFW permits
and documentation.
Prior to
issuance of
construction
permit.
Construction
contractor;
City of
Diamond Bar
Community
Development
Department
Mitigation Monitoring and Reporting Program for the City of Diamond Bar General Plan 2040 and Climate Action Plan 2040
8
Impact Mitigation Measure Method of Verification Timing of
Verification
Responsibility for
Verification
Verification Complete
Date Initial
listed endangered and threatened plants.
The FESA does not address listed plants
on private property. However, if a
federal action is required for a project
(funding, Clean Water Act compliance,
etc.), a permit from the USFWS and
CDFW to take a listed species is
required.
Implementation of the
Proposed Project could
result in indirect impacts
on special-status plant
species, sensitive natural
communities, preserved
open space, and wildlife
corridors.
MM-BIO-1D Environmental
Awareness Program: In order to
reduce indirect impacts on special-status
plants, sensitive natural communities,
preserved open space and wildlife
corridors, the City shall implement the
following measures:
• The City shall implement an
Environmental Awareness Program
on its web site intended to increase
awareness to developers, residents
and city workers of the sensitive
plants, wildlife and associated
habitats that occur in the preserved
open space areas. The intention of
the program shall be to inform
developers, city workers, and
residents and encourage active
conservation efforts to help
conserve the habitats in the
preserved open space. The program
shall address impacts associated with
the introduction of invasive plant
species as a result of new
development. At a minimum, the
Implementation of
Environmental
Awareness Program.
Ongoing. City of
Diamond Bar
Community
Development
Department
Mitigation Monitoring and Reporting Program for the City of Diamond Bar General Plan 2040 and Climate Action Plan 2040
9
Impact Mitigation Measure Method of Verification Timing of
Verification
Responsibility for
Verification
Verification Complete
Date Initial
Environmental Awareness Program
shall include the following
components:
o Informational kiosks shall be
added or modified at
entrance points to hiking
and equestrian trails to
inform city workers,
residents and trail users on
the sensitive flora and fauna
that rely on the habitats
found within the preserved
open space. The intent of
these kiosks is to bring
awareness to the sensitive
plants, wildlife and
associated habitats which
occur in the area.
o The City shall provide
future project applicants a
brochure which includes a
list of sensitive plant and
tree species to avoid
impacting as well as
suggested plant palettes to
be used in residential
landscaping near natural
areas to prevent the
introduction of invasive
plant species to the
surrounding natural
communities.
Mitigation Monitoring and Reporting Program for the City of Diamond Bar General Plan 2040 and Climate Action Plan 2040
10
Impact Mitigation Measure Method of Verification Timing of
Verification
Responsibility for
Verification
Verification Complete
Date Initial
Construction associated
with implementation of
the Proposed Project
could have an adverse
effect on special-status
animal species.
MM-BIO-1E Preconstruction
Surveys for Special-Status Wildlife:
Within one (1) week prior to initiating
disturbance activities, clearance surveys
for special-status animal species shall be
performed by a qualified biologist(s)
within the boundaries of the future
project disturbances. If any special-
status animals are found on the site, a
qualified biologist(s) flag the area for
avoidance and discuss possible seasonal
avoidance measures with the developer.
If avoidance is not feasible, the Project
Biologist, with a CDFG Scientific
Collection Permit shall relocate these
species to suitable habitats within
surrounding open space areas that
would remain undisturbed, unless the
biologist determines that such
relocation cannot reasonably be
accomplished at which point CDFG will
be consulted regarding whether
relocation efforts should be terminated.
Relocation methods (e.g., trap and
release) and receiver sites shall be
verified and approved by the CDFG
prior to relocating any animals.
Submittal of
preconstruction
surveys.
Prior to
issuance of
construction
permit.
Construction
contractor;
City of
Diamond Bar
Community
Development
Department
Implementation of the
Proposed Project could
cause direct or indirect
impacts on suitable
habitat for federally or
MM-BIO-IF Listed Endangered
or Threatened Wildlife: Prior to
approval of individual projects that have
the potential to cause direct or indirect
impacts on suitable habitat for federally
or state listed endangered or
Submittal of findings
and documentation.
Prior to
discretionary
project
approval.
City of
Diamond Bar
Community
Development
Department
Mitigation Monitoring and Reporting Program for the City of Diamond Bar General Plan 2040 and Climate Action Plan 2040
11
Impact Mitigation Measure Method of Verification Timing of
Verification
Responsibility for
Verification
Verification Complete
Date Initial
state listed endangered
or threatened species.
threatened species, the City shall
require a habitat evaluation to be
completed by a qualified biologist well
versed in the requirements of the
associated species to be completed. If
no suitable habitat for listed species is
identified within 300 feet of
construction or maintenance activities,
no further measures would be required
in association with the project. If
suitable habitat for the species is
identified within 300 feet of such
activities, prior to construction, the City
shall require that a survey be completed
by a qualified biologist for the species in
accordance with protocols established
by the US Fish and Wildlife Service.
Table 3.3-5 provides a listing of
endangered and threatened species by
habitat type and potential for
occurrence.
In the event a state or federal listed
species is determined to occupy the
proposed Planning Area or its
immediate surroundings, the CDFW
and/or USFWS shall be consulted, as
required by CESA and/or FESA. In
order to address and acknowledge the
potential for listed species to occur
within the Planning Area or be impacted
by future development projects, this
assessment acknowledges future actions
by state and federal resource agencies in
Mitigation Monitoring and Reporting Program for the City of Diamond Bar General Plan 2040 and Climate Action Plan 2040
12
Impact Mitigation Measure Method of Verification Timing of
Verification
Responsibility for
Verification
Verification Complete
Date Initial
addition to the analyses necessary and
required under CEQA. Compensation
is likely to include one or more of the
following on- or off-site measures:
dedication/preservation of suitable
habitat for the species; habitat
enhancement/creation; and provisions
for long-term habitat management.
Clearing and grading
activities associated with
implementation of the
Proposed Project could
disturb nesting bird
habitats.
MM-BIO-1G Nesting Bird
Surveys: All vegetation clearing for
construction and fuel modification shall
occur outside of the breeding bird
season, if feasible, to ensure that no
active nests would be disturbed unless
clearing and/or grading activities cannot
be avoided during that time period.
If clearing and/or grading activities
cannot be avoided during the breeding
season, all suitable habitats shall be
thoroughly surveyed for the presence of
nesting birds by a qualified biologist
prior to removal. Suitable nesting
habitat on the Planning Area includes
grassland, scrub, chaparral, and
woodland communities. If any active
nests are detected, the area shall be
flagged, along with a 300-foot buffer for
song birds and a 500-foot buffer for
raptorial birds (or as otherwise
appropriate buffer as determined by the
surveying biologist), and shall be avoided
until the nesting cycle is complete or it
Submittal of findings
and documentation.
Prior to start
of clearing
and/or
grading
activities.
City of
Diamond Bar
Community
Development
Department
Mitigation Monitoring and Reporting Program for the City of Diamond Bar General Plan 2040 and Climate Action Plan 2040
13
Impact Mitigation Measure Method of Verification Timing of
Verification
Responsibility for
Verification
Verification Complete
Date Initial
is determined by the surveying biologist
that the nest is no longer active.
Implementation of the
Proposed Project could
disturb active golden
eagle nests.
MM-BIO-1H Protection of Eagle
Nests: No development or project
activities shall be permitted within one-
half mile of a determined active golden
eagle nest unless the planned activities
are sited in such a way that the activity
has minimal potential to cause
abandonment of the nesting site, as
determined by a qualified biologist. In
addition, the eagle nest (if active) shall
be monitored by a biologist who is
highly familiar with the signs of eagle
distress during the project development
activities. The monitoring shall continue
until the monitoring biologist is
confident the nest will not be disturbed.
The monitoring biologist shall have the
authority to stop project activities as
needed.
(Note: Generally, information regarding
the location of raptorial bird nests is
kept highly confidential. As such it is
recommended that representatives of
CDFW, USFWS and/or the Chino Hills
State Park be notified of any proposed
projects in the SOI or Tres Hermanos
portions of the Planning Area. In
consultation with agency
representatives, it can be determined if
the project is within one-half mile of the
Submittal of findings
and documentation.
Ongoing. City of
Diamond Bar
Community
Development
Department
Mitigation Monitoring and Reporting Program for the City of Diamond Bar General Plan 2040 and Climate Action Plan 2040
14
Impact Mitigation Measure Method of Verification Timing of
Verification
Responsibility for
Verification
Verification Complete
Date Initial
eagle nest without the location being
specifically identified.)
Construction associated
with implementation of
the Proposed Project
could disturb bat
roosting habitat.
MM-BIO-1I Use of Buffers Near
Active Bat Roosts: During the
November 1 to March 31 hibernation
season, construction activities shall not
be conducted within 100 feet of
woodland habitat that provides suitable
bat roosting habitat. Bat presence is
difficult to detect using emergence
surveys during this period due to
decreased flight and foraging behavior. If
a qualified biologist who is highly familiar
with bat biology determines that
woodland areas do not provide suitable
hibernating conditions for bats and they
are unlikely to be present in the area,
work may commence as planned.
Submittal of findings
and documentation.
During the
November 1
through
March 31
hibernation
season and
shortly
thereafter.
Construction
contractor;
City of
Diamond Bar
Community
Development
Department
Construction associated
with implementation of
the Proposed Project
could disrupt bat
roosting habitat.
MM BIO-1J Bat Maternity
Roosting Season: Night-time evening
emergence surveys and/or internal
searches within large tree cavities shall
be conducted by a qualified biologist
who is highly familiar with bat biology
during the maternity season (April 1 to
August 31) to determine
presence/absence of bat maternity
roosts near wooded project boundaries.
All active roosts identified during
surveys shall be protected by a buffer to
be determined by a qualified bat
biologist. The buffer will be determined
by the type of bat observed,
Submittal of findings
and documentation.
During the
April 1
through
August 31
maternity
season.
Surveys valid
30 days from
survey date.
Construction
contractor;
City of
Diamond Bar
Community
Development
Department
Mitigation Monitoring and Reporting Program for the City of Diamond Bar General Plan 2040 and Climate Action Plan 2040
15
Impact Mitigation Measure Method of Verification Timing of
Verification
Responsibility for
Verification
Verification Complete
Date Initial
topography, slope, aspect, surrounding
vegetation, sensitivity of roost, type of
potential disturbance, etc. Each
exclusion zone would remain in place
until the end of the maternity roosting
season. If no active roosts are identified,
then work may commence as planned.
Survey results are valid for 30 days from
the survey date. Should work
commence later than 30 days from the
survey date, surveys should be repeated.
Construction associated
with implementation of
the Proposed Project
could disrupt bat
roosting habitat.
MM BIO-1K Bat Roost
Replacement: All special-status bat
roosts that are destroyed by the project
must be documented and shall be
replaced at a 1:1 ratio on- or off-site
with a roost suitable for the displaced
species (e.g., bat houses for colonial
roosters). The design of such
replacement habitat shall be coordinated
with CDFG. The new roost shall be in
place prior to the time that the bats are
expected to use the roost as
determined by a qualified biologist who
is highly familiar with bat biology, and
shall be monitored periodically for five
(5) years to ensure proper roosting
habitat characteristics (e.g., suitable
temperature and no leaks). The roost
shall be modified as necessary to
provide a suitable roosting environment
for the target bat species.
Submittal of
documentation.
Prior to the
time the bats
are expected
to use the
roost as
determined
by a qualified
biologist.
Monitoring
shall occur
periodically
over 5 years
thereafter.
Construction
contractor;
City of
Diamond Bar
Community
Development
Department
Mitigation Monitoring and Reporting Program for the City of Diamond Bar General Plan 2040 and Climate Action Plan 2040
16
Impact Mitigation Measure Method of Verification Timing of
Verification
Responsibility for
Verification
Verification Complete
Date Initial
Implementation of the
Proposed Project could
result in adverse impacts
to sensitive shrubland
and scrub natural
communities.
MM BIO-2 Sensitive Natural
Communities: To mitigate impacts on
sensitive shrubland and scrub natural
communities, project applicants shall
implement the following mitigation
measures prior to any ground
disturbance:
• If avoidance cannot be reasonably
accomplished, impacts on any
shrubland, scrub or woodland
alliance indicated as sensitive in Table
3.3-2 shall be mitigated through on-
or off‐site restoration/enhancement.
For off-site
restoration/enhancement, the
applicant shall acquire mitigation land
of similar habitat at a ratio of at least
1:1. On-site
restoration/enhancement shall also
be completed at a ratio of at least
1:1.
• For projects that have the potential
to result in direct or indirect impacts
on sensitive natural communities, a
habitat restoration plan shall be
prepared prior to any ground
disturbance. The Plan shall include
adaptive management practices as
specified by the Department of the
Interior to achieve the specified ratio
for restoration/enhancement. At a
minimum, the Plan shall include a
description of the existing conditions
Submittal of
documentation.
Prior to start
of ground
disturbance.
Construction
contractor;
City of
Diamond Bar
Community
Development
Department
Mitigation Monitoring and Reporting Program for the City of Diamond Bar General Plan 2040 and Climate Action Plan 2040
17
Impact Mitigation Measure Method of Verification Timing of
Verification
Responsibility for
Verification
Verification Complete
Date Initial
of the receiver site(s), goals and
timeline, installation methods,
monitoring procedures, plant
spacing, adaptive management
strategies, and maintenance
requirements to ensure the sensitive
communities referred to above re-
established successfully at the ratios
set forth above.
Implementation of the
Proposed Project could
result in adverse impacts
on jurisdictional waters.
MM BIO-3 Jurisdictional
Waters: To mitigate for impacts on
jurisdictional waters, the applicant shall
implement the following measures in
consultation with the regulating agencies
(USACE, CDFW, and RWQCB, where
applicable) over the course of the
project:
• The applicant shall provide on - and
off-site replacement and/or
restoration/enhancement of USACE,
RWQCB and CDFG jurisdictional
waters and wetlands at a ratio no
less than 1.5:1 and/or include the
purchase of mitigation credits at an
agency‐approved off‐site mitigation
bank.
• If replacement and/or
restoration/enhancement would
occur, a restoration plan shall be
prepared that describes the location
of restoration and provides for
replanting and monitoring for a
Submittal of
documentation.
Ongoing. Construction
contractor;
City of
Diamond Bar
Community
Development
Department
Mitigation Monitoring and Reporting Program for the City of Diamond Bar General Plan 2040 and Climate Action Plan 2040
18
Impact Mitigation Measure Method of Verification Timing of
Verification
Responsibility for
Verification
Verification Complete
Date Initial
three-year period following
construction.
Implementation of the
Proposed Project could
result in a loss of oak
woodland.
MM-BIO-4 Oak Woodlands: In
the event a future project would result
in the loss of an oak woodland, the
project shall be subject to the mitigation
requirements set forth in the Los
Angeles County Oak Woodland
Conservation Management Plan Guide.
If a future project cannot be redesigned
to avoid impacts on oak woodland, then
one of the following measures shall be
implemented:
• Acquire oak woodland habitat that is
comparable to the habitat that was
impacted at a ratio of 1:1.
• Restore degraded oak woodlands
o Off-site restoration should
be prioritized over on-site
restoration and where
feasible, should be located
nearby the impacted
property, preferably within
the same watershed or sub-
drainage as deemed
appropriate by a qualified
biologist, or within the same
planning area as the
impacted property. Off-site
restoration may include any
of the following: acquiring
off-site fee title for oak
woodland habitat;
Submittal of final
report.
Ongoing.
Mitigation
areas shall be
placed in a
conservation
easement
within 6
months of a
completion.
Project
mitigation
shall be
monitored
and reported
on over a 7-
year period.
Construction
contractor;
City of
Diamond Bar
Community
Development
Department
Mitigation Monitoring and Reporting Program for the City of Diamond Bar General Plan 2040 and Climate Action Plan 2040
19
Impact Mitigation Measure Method of Verification Timing of
Verification
Responsibility for
Verification
Verification Complete
Date Initial
replacement planting;
and/or restoring moderately
or severely degraded oak
woodlands (more
specifically, removing
exotics and restoring
appropriate native plant
diversity).
o On-site restoration of a
ratio of at least 1:1 should
be utilized when
circumstances at the site
allow for long-term
sustainability of the
replacement plantings, the
potential to expand/connect
to adjacent oak woodlands,
and/or the improvement of
degraded oak woodlands. If
possible, on-site restoration
areas should be located
adjacent to preserved
natural space. The project
applicant shall
replace/restore lost canopy
area. More specifically, the
project applicant shall
provide mitigation trees of
the same Oak species. All
replacement trees should be
planted on native
undisturbed soil and should
be the same species of oak
(Quercus sp.) as the
Mitigation Monitoring and Reporting Program for the City of Diamond Bar General Plan 2040 and Climate Action Plan 2040
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Verification
Responsibility for
Verification
Verification Complete
Date Initial
removed tree with
appropriate associated
native vegetation in the
understory. The location of
the replacement tree should
be in the vicinity of other
oak trees of the same
species. If replacement trees
cannot be planted on native
undisturbed soil or are not
in the vicinity of the same
species of oak (Quercus sp.)
as the removed tree, the
city may require
implementation of additional
measures as listed in MM-
BIO-4 to ensure that trees
thrive.
Mitigation areas or land should be at a
minimum of two (2) to one (1) canopy
cover area for the amount removed.
This is the expected canopy extent of
mature trees. All mitigation areas or
land should be placed in a conservation
easement within six months of a
easement is not possible, the land shall
be protected in perpetuity by other
means deemed acceptable by the City.
Mitigation land may be designated public
open space by the City if deemed
appropriate per the description of Open
Space found in Chapter 2: Land Use of
the proposed General Plan.
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Project mitigation shall be monitored
and reported on over a seven-year
period and shall incorporate an iterative
process of annual monitoring and
evaluation of progress and allow for
adjustments to the program, as
necessary, to achieve desired outcomes
and meet success criteria. Annual
reports discussing the implementation,
monitoring, and management of the
mitigation project shall be submitted to
the City and should contain the
following components: description of
the project impact and mitigation site;
specific objectives/success criteria,
evaluated based on approved survival
rates and percent cover of planted
native species; control of invasive plant
and animal species within the mitigation
site; monitoring and maintenance
activities conducted since the previous
report; and any contingency measures
implemented since the previous report.
Success criteria should be based on a
reference site supporting the desired
oak species and understory that the
mitigation site is designed to achieve.
Once the mitigation project has been
completed, the applicant shall submit a
final report to the City. The report shall
discuss the implementation, monitoring
and management of the mitigation
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project over the seven-year period, and
indicates whether the mitigation project
has, in part, or in whole, been successful
based on established success criteria.
The project shall be extended if success
criteria have not been met at the end of
the seven-year period to the satisfaction
of the City.
Implementation of the
Proposed Project could
result in a loss of oak
woodland.
MM-BIO-5 Walnut Woodlands:
In the event a future project would
result in the loss of a walnut woodland,
then one of the following measures shall
be implemented:
• Acquire walnut woodland habitat
that is comparable to the habitat that
was impacted at a ratio of 1:1.
• Restore degraded walnut woodlands
o Off-site restoration should
be prioritized over on-site
restoration and where
feasible, should be located
nearby the impacted
property, preferably within
the same watershed or sub-
drainage as deemed
appropriate by a qualified
biologist, or within the same
planning area as the
impacted property. Off-site
restoration may include any
of the following: acquiring
off-site fee title for walnut
woodland habitat;
Submittal of final
report.
Ongoing.
Mitigation
areas shall be
placed in a
conservation
easement
within 6
months of a
completion.
Project
mitigation
shall be
monitored
and reported
on over a 7-
year period.
Construction
contractor;
City of
Diamond Bar
Community
Development
Department
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replacement planting;
and/or restoring moderately
or severely degraded walnut
woodlands (more
specifically, removing
exotics and restoring
appropriate native plant
diversity).
o On-site restoration of a
ratio of at least 1:1 should
be utilized when
circumstances at the site
allow for long-term
sustainability of the
replacement plantings, the
potential to expand/connect
to adjacent walnut
woodlands, and/or the
improvement of degraded
walnut woodlands. If
possible, on-site restoration
areas should be located
adjacent to preserved
natural space. The project
applicant shall
replace/restore lost canopy
area. More specifically, the
project applicant shall
provide mitigation trees of
the same species comprising
the walnut woodland,
including the constituent or
co-dominant oak species.
All replacement trees
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should be planted on native
undisturbed soil and should
be the same species of
walnut (Juglans sp.) and oak
(Quercus sp.) as the
removed tree with
appropriate associated
native vegetation in the
understory. The location of
the replacement tree should
be in the vicinity of other
trees of the same species. If
replacement trees cannot
be planted on native
undisturbed soil or are not
in the vicinity of the same
species as the removed
tree, the city may require
implementation of additional
measures as listed in MM-
BIO-5 to ensure that trees
thrive.
Mitigation areas or land should be at a
minimum of two (2) to one (1) canopy
cover area for the amount removed.
This is the expected canopy extent of
mature trees. All mitigation areas or
land should be placed in a conservation
easement within six months of a
easement is not possible, the land shall
be protected in perpetuity by other
means deemed acceptable by the City.
Mitigation land may be designated public
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open space by the City if deemed
appropriate per the description of Open
Space found in Chapter 2: Land Use of
the proposed General Plan.
Project mitigation shall be monitored
and reported on over a seven-year
period and shall incorporate an iterative
process of annual monitoring and
evaluation of progress and allow for
adjustments to the program, as
necessary, to achieve desired outcomes
and meet success criteria. Annual
reports discussing the implementation,
monitoring, and management of the
mitigation project shall be submitted to
the City and should contain the
following components: description of
the project impact and mitigation site;
specific objectives/success criteria,
evaluated based on approved survival
rates and percent cover of planted
native species; control of invasive plant
and animal species within the mitigation
site; monitoring and maintenance
activities conducted since the previous
report; and any contingency measures
implemented since the previous report.
Success criteria should be based on a
reference site supporting the desired
walnut woodland species and
understory that the mitigation site is
designed to achieve.
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Once the mitigation project has been
completed, the applicant shall submit a
final report to the City. The report shall
discuss the implementation, monitoring
and management of the mitigation
project over the seven-year period, and
indicates whether the mitigation project
has, in part, or in whole, been successful
based on established success criteria.
The project shall be extended if success
criteria have not been met at the end of
the seven-year period to the satisfaction
of the City.
Implementation of the
Proposed Project could
diminish the integrity of
the Tonner Canyon
movement corridor.
MM-BIO-6 Wildlife Movement
Corridor: In order to ensure the
existing integrity of the Tonner Canyon
movement corridor, the following land
use design criteria shall be adhered to
when reviewing future projects:
Corridor Features
• The corridor should be as wide as
possible. The corridor width may
vary with habitat type or target
species, but a rule of thumb is about
a minimum of 1,000 feet wide (but
larger if possible).
• Maintain as much natural open space
as possible next to any culverts and
road undercrossings to encourage
the use of these by wildlife.
Include in project
conditions of
approval.
Prior to
discretionary
project
approval.
Construction
contractor;
City of
Diamond Bar
Community
Development
Department
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• Maximize land uses adjacent to the
corridor that reduce human impacts
on the corridor.
• Avoid development or other impacts
to project into the corridor to form
impediments to movement and
increase harmful edge effects.
• If development is to be permitted
next to the corridor, put
conservation easements on adjacent
lots to prohibit structures nearest
the corridor.
• Develop strict maximum brightness
restrictions for development
adjacent to the corridor to prevent
light trespass into the corridor.
Lights must be directed downward
and inward toward the development.
Culvert Design
• Bridged undercrossings are
preferable.
• If a bridge is not possible, use a 12-
foot by 12-foot box culvert or bigger
for larger animals.
• Install a small, one-foot diameter
tube parallel to the large box culvert
for small animals. The upstream end
of the small tube should be a few
inches higher than the bottom of the
upstream end of the box culvert, so
that it will stay dry and free of
debris.
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• The culvert bottoms should be as
close as possible to any canyon
bottom and not be perched up a fill
slope.
• Use natural substrate on the bottom
of the culvert, such as dirt with
pebbles.
• On roads above the undercrossings
and culverts, install speed bumps and
wildlife crossing signs to slow the
cars, and avoid street lighting to
facilitate use of the crossing.
• Plant and maintain vegetative cover
(shrubs and low cover) near the
entrance-exits of the culverts,
without visually or physically blocking
the entries.
• Install appropriate fencing (at least
six feet in height) to funnel animals
towards the undercrossings and
culverts.
Vegetation Restoration
• Require maintenance or restoration
of native vegetation, and long-term
management.
• Develop an adequate endowment
program for restoration and
management of the corridor.
• Plant native trees, shrubs, and other
plants to provide food and cover, as
well as nesting opportunities for
birds.
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Management and Enforcement
• If housing is to be permitted adjacent
to the corridor, require the
homeowners associations or each
homeowner to maintain -- on their
own property -- a mowed, 30-foot
to 60-foot buffer along a flat or
slightly sloped grade between the
native vegetation in the corridor and
each adjacent lot, for fire abatement.
• Avoid fencing in the corridor that
would bottleneck the corridor.
• Unleashed domestic pets should not
be allowed in the corridor.
• Educate each landowner adjacent to
the corridor about the regulations
(lighting, mowing the buffer, no
trespass, do not place pet food
outside, etc.) and develop a pamphlet
and convene a community meeting.
In appropriate locations, install
educational signs about the corridor
and the species that could potentially
use the corridor.
Cultural, Historic, and Tribal Cultural Resources
Implementation of the
Proposed Project could
cause adverse impacts
on historical resources.
MM-CULT-1 Prior to development
of any project on a parcel containing at
least one structure more than 45 years
old and until such time a Citywide
historic resource survey is completed,
the project proponent shall retain a
qualified architectural historian, defined
Submittal of findings
and documentation.
Prior to
discretionary
project
approval.
Construction
contractor;
City of
Diamond Bar
Community
Development
Department
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as meeting the Secretary of the
Standards for architectural history, to
conduct a preliminary assessment. If the
property appears to be potentially
eligible for a local, state and/or federal
listing, a full historic resources
assessment shall be required. A full
historic resources assessment shall
include: a records search at the South
Central Coastal Information Center; a
review of pertinent archives, databases,
and sources; a pedestrian field survey;
recordation of all identified historic
resources on California Department of
Parks and Recreation 523 forms; and
preparation of a technical report
documenting the methods and results of
the assessment. All identified historic
resources will be assessed for the
tential to result in direct
and/or indirect effects on those
resources and any historic resource that
may be affected shall be evaluated for its
potential significance under national and
approval of project plans and publication
of subsequent CEQA documents. The
qualified architectural historian shall
provide recommendations regarding
additional work, treatment, or
mitigation for affected historical
resources to be implemented prior to
their demolition or alteration. Impacts
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on historical resources shall be analyzed
using CEQA thresholds to determine if
a project would result in a substantial
adverse change in the significance of a
historical resource. If a potentially
significant impact would occur, the City
shall require appropriate mitigation to
lessen the impact to the degree feasible.
This mitigation measure shall not apply
to minor projects that would otherwise
qualify for an exemption under CEQA,
such as, but not limited to, room
additions, reroofs, and the removal of
minor accessory structures and
landscaping projects.
Implementation of the
Proposed Project could
cause adverse impacts
on archaeological
resources.
MM-CULT-2 Prior to development
of a project that involves ground
disturbance, the project proponent shall
retain a qualified archaeologist, defined
as meeting the Secretary of the
nal Qualification
Standards for archaeology, to conduct
an archaeological resources assessment
including: a records search at the South
Central Coastal Information Center; a
Sacred Lands File search at the Native
American Heritage Commission; a
pedestrian field survey; recordation of
all identified archaeological resources on
California Department of Parks and
Recreation 523 forms; an assessment of
sensitivity and the potential to
encounter subsurface archaeological
Submittal of
archaeological
resources
assessment.
Prior to
discretionary
project
approval.
Construction
contractor;
City of
Diamond Bar
Community
Development
Department
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resources and human remains;
subsurface investigation to define the
horizontal and vertical extents of any
identified archaeological resources; and
preparation of a technical report
documenting the methods and results of
the study. All identified archaeological
resources shall be assessed for the
and/or indirect effects on those
resources and any archaeological
resource that cannot be avoided shall be
evaluated for its potential significance
roject
plans and publication of subsequent
CEQA documents. The qualified
archaeologist shall provide
recommendations regarding protection
of avoided resources and/or
recommendations for additional work,
treatment, or mitigation of significant
resources that will be affected by the
project. This mitigation measure shall
not apply to minor projects that would
otherwise qualify for an exemption
under CEQA, such as, but not limited
to, the construction of a single-family
residences, excavations for swimming
pools, and landscaping projects.
Geology, Soils, and Seismicity
Implementation of the
Proposed Project could
cause adverse impacts
MM-GEO-1 Prior to development
of projects that involve ground
disturbance or excavations in
Submittal of
technical report.
Prior to
discretionary
Construction
contractor;
City of
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on paleontological
resources.
undisturbed native soils, the project
proponent shall retain a paleontologist
meeting the Society of Vertebrate
professional paleontologist (SVP, 2010)
to conduct an paleontological resources
assessment including: a site-specific
database search at the Natural History
Museum of Los Angeles County and/or
other appropriate facilities (such as the
University of California Museum of
Paleontology); geologic map and
scientific literature review; a pedestrian
field survey, where deemed appropriate
by the qualified professional
paleontologist; assessment of the
and paleontological monitoring
requirements (locations, depths,
duration, timing); and preparation of a
technical report that documents the
methods and results of the study. The
report shall be prepared prior to the
project plans and publication of
subsequent CEQA documents.
project
approval.
Diamond Bar
Community
Development
Department
Implementation of the
Proposed Project could
cause adverse impacts
on paleontological
resources.
MM-GEO-2 The City shall require
paleontological resources monitoring
for any project that has a high potential
for encountering subsurface
paleontological resources. The location,
depths, duration, and timing of
monitoring shall be determined by the
qualified professional paleontologist
Submittal of findings
and documentation,
followed by
monitoring report.
Prior to
discretionary
project
approval.
Monitoring
report shall
Construction
contractor;
City of
Diamond Bar
Community
Development
Department
Mitigation Monitoring and Reporting Program for the City of Diamond Bar General Plan 2040 and Climate Action Plan 2040
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based on the sensitivity assessment in
the study required as part of MM-GEO-
1. Prior to the start of ground
disturbance, the project proponent shall
retain a qualified monitor meeting the
standards for paleontological resource
monitors (SVP, 2010), and who shall
work under the direct supervision of
the qualified professional paleontologist.
In the event that paleontological
resources are unearthed during ground-
disturbing activities, the monitor shall be
empowered to halt or redirect ground-
disturbing activities away from the
vicinity of the discovery until the
qualified professional paleontologist has
determined its significance and provided
recommendations for preservation in
place or recovery of the resource. The
monitor shall keep daily logs detailing
the types of activities and soils
observed, and any discoveries. After
cessation of ground disturbance, the
qualified professional paleontologist shall
prepare a report that details the results
of monitoring.
be prepared
after
cessation of
ground
disturbance.