San Dimas City Council
December 10, 2024

❖ SECTION 411 – LAND USE AND PLANNING ❖
Figure 4.11-2

PROJECT SITE CURRENT ZONING DESIGNATIONS
7145/San Dimas MCTA 20-0005
Initial Study/Mitigated Negative Declaration

❖ SECTION 4.12 – MINERAL RESOURCES ❖

4.12 Mineral Resources
Less than
Potentially
Significant
Impact
Significant
Impact with
Mitigation
Less than
Significant
Impact
No
Impact Would the project:

Incorporated
a) Result in the loss of availability of a
known mineral resource that would be
of value to the region and the residents
of the state?
b) Result in the loss of availability of a
locally-important mineral resource
recovery site delineated on a local
general plan, specific plan or other
land use plan?
X
X
a) Would the project result in the loss of availability of a known mineral resource that would be of value to the region and the residents of the State? and
b) Would the project result in the loss of availability of a locally important mineral resource recovery site delineated on a local general plan, specific plan, or other land use plan? Less than Significant Impact
As shown on Figure 4.12-1, the project site is located within the San Gabriel Valley productionconsumption (P-C) Region and within Mineral Resource Zone (MRZ)-3, which is an area containing mineral deposits the significance of which cannot be evaluated from available data (Miller, R.V., 1994a and 1994b). The closest mine is an open pit sand and gravel mine, the Olive Pit Mine 91-19- 0052, located northwest of the intersection of Azusa Canyon Road and Los Angeles Street in the City of Irwindale (DMR, 2022). This mine is located approximately 5.6 miles west of the project site.

According to the Land Use Element of the San Dimas General Plan, the City does not include mining in any of its zoning categories and the Conservation Element discourages mining of aggregate resources where potential conflicts (such as, traffic, noise, and dust impacts) may be experienced with adjacent land uses (City of San Dimas, 1991). The nearest oil or gas well to the project site is approximately 1.3 miles to the south, as shown in Figure 4.12-2 (Miller, R.V., 1994a). No geothermal wells are present in the vicinity of the project site (DOC, 2022b); refer to Figure 4.12-3. Therefore, the project would have a less than significant impact on the availability of known mineral resources of value to the region or to any locally important mines. 7145/San Dimas MCTA 20-0005 Page 4.12-1
Initial Study/Mitigated Negative Declaration Page 1129 – 2053 December 2022 ❖ SECTION 4.12 – MINERAL RESOURCES ❖
Figure 4.12-1

MINERAL RESOURCES
7145/San Dimas MCTA 20-0005 Page 4.12-2
Initial Study/Mitigated Negative Declaration Page 1130 – 2053December 2022 ❖ SECTION 4.12 – MINERAL RESOURCES ❖
Figure 4.12-2

OIL AND GAS WELLS AND FIELDS
7145/San Dimas MCTA 20-0005
Initial Study/Mitigated Negative Declaration

❖ SECTION 4.12 – MINERAL RESOURCES ❖
Figure 4.12-3

GEOTHERMAL WELLS
7145/San Dimas MCTA 20-0005
Initial Study/Mitigated Negative Declaration

❖ SECTION 4.13 – NOISE ❖

4.13 Noise
Less than
Significant
Impact with
Mitigation
Potentially
Significant
Impact
Less than
Significant No Impact
Impact
Would the project result in:

Incorporated
a) Generation of a substantial temporary
or permanent increase in ambient
noise levels in the vicinity of the
project in excess of standards X
X
established in the local general plan or
noise ordinance, or applicable
standards of other agencies?
b) Generation of excessive groundborne
vibration or groundborne noise levels?
c) For a project located within the vicinity
of a private airstrip or an airport land
use plan or, where such a plan has not
been adopted, within two miles of a
public airport or public use airport,
would the project expose people
residing or working in the project area
to excessive noise levels?
X

4.13.1 Characteristics of Sound
Sound is a pressure wave transmitted through the air. It is described in terms of loudness or amplitude (measured in decibels), frequency or pitch (measured in hertz [Hz] or cycles per second), and duration (measured in seconds or minutes). The decibel (dB) scale is a logarithmic scale that describes the physical intensity of the pressure vibrations that make up any sound. The pitch of the sound is related to the frequency of the pressure vibration. Because the human ear is not equally sensitive to all frequencies, a special frequency-dependent rating scale is used to relate noise to human sensitivity. The A-weighted decibel scale (dBA) provides this compensation by discriminating against upper and lower frequencies in a manner approximating the sensitivity of the human ear. The scale is based on a reference pressure level of 20 micropascals (zero dBA). The scale ranges from zero (for the average least perceptible sound) to about 130 (for the average human pain level).

4.13.2 Noise Measurement Scales
Several rating scales have been developed to analyze adverse effects of community noise on people.

Since environmental noise fluctuates over time, these scales consider that the effect of noise on people depends largely upon the total acoustical energy content of the noise, as well as the time of day when the noise occurs. Those that are applicable to this analysis are as follows:
• Leq, the equivalent noise level, is an average of sound level over a defined time period (such as 1 minute, 15 minutes, 1 hour or 24 hours). Thus, the Leq of a time-varying noise and that of a steady noise are the same if they deliver the same acoustic energy to the ear during exposure.
7145/San Dimas MCTA 20-0005 Page 4.13-1
Initial Study/Mitigated Negative Declaration Page 1133 – 2053 December 2022 ❖ SECTION 4.13 – NOISE ❖
•
•
L90 is a noise level that is exceeded 90 percent of the time at a given location; it is often used as a measure of “background” noise.

Lmax is the root mean square (RMS) maximum noise level during the measurement interval.

This measurement is calculated by taking the RMS of all peak noise levels within the sampling interval. Lmax is distinct from the peak noise level, which only includes the single highest measurement within a measurement interval.
•
•
CNEL, the Community Noise Equivalent Level, is a 24-hour average Leq with a 4.77-dBA “penalty” added to noise during the hours of 7:00 p.m. to 10:00 p.m., and a 10-dBA penalty added to noise during the hours of 10:00 p.m. to 7:00 a.m. to account for noise sensitivity in the evening and nighttime (Caltrans, 2020). The logarithmic effect of these additions is that a 60-dBA 24-hour Leq would result in a calculation of 66.7 dBA CNEL.

Ldn, the day-night average noise, is a 24-hour average Leq with an additional 10-dBA “penalty” added to noise that occurs between 10 p.m. and 7 a.m. The Ldn metric yields values within 1 dBA of the CNEL metric. As a matter of practice, Ldn and CNEL values are considered to be equivalent and are treated as such in this assessment.

4.13.3 Existing Noise
The project site is a residential neighborhood of approximately 92 acres, subdivided into 36 residential lots, of which 29 lots are developed with single-family residences and seven are vacant.

With the exception of homes within the project site area, the only sensitive receptors are the homes located in residential developments to the east and west of the project site. The only current sources of noise in the neighborhood are the existing residences, including traffic into and out of the homes as well as ambient noise from the residences.

4.13.4 Regulatory Setting
State of California
The most current guidelines prepared by the state noise officer are contained in Appendix D of the General Plan Guidelines issued by the Governor’s Office of Planning and Research (OPR) in 2017 (OPR, 2017). These guidelines establish four categories for judging the severity of noise intrusion on specified land uses:
•
•
Normally Acceptable: Is generally acceptable, with no mitigation necessary.

Conditionally Acceptable: May require some mitigation, as established through a noise study.
•
•
Normally Unacceptable: Requires substantial mitigation.

Clearly unacceptable: Probably cannot be mitigated to a less-than-significant level.

The OPR noise compatibility guidelines assign ranges of CNEL values to each of these categories. The ranges differ for different types of sensitive receivers, and are shown in Table 4.13-2. 7145/San Dimas MCTA 20-0005 Page 4.13-2
Initial Study/Mitigated Negative Declaration Page 1134 – 2053 December 2022 ❖ SECTION 4.13 – NOISE ❖
Table 4.13-2

CALIFORNIA LAND USE COMPATIBILITY FOR COMMUNITY NOISE SOURCES Land Use Category Noise Exposure (dBA, CNEL)
55 60 65 70 75 80
Residential – Low-Density Single-Family, Duplex,
Mobile Homes
Residential – Multiple Family
Transient Lodging – Motel, Hotels
Schools, Libraries, Churches, Hospitals, Nursing Homes
Auditoriums, Concert Halls, Amphitheaters
Sports Arena, Outdoor Spectator Sports
Playgrounds, Neighborhood Parks
Golf Courses, Riding Stables, Water Recreation,
Cemeteries
Office Buildings, Business Commercial and
Professional
Industrial, Manufacturing, Utilities, Agriculture
Normally Acceptable: Specified land use is satisfactory, based upon the assumption that any buildings involved are of normal conventional construction without any special noise insulation requirements.

Conditionally Acceptable: New construction or development should be undertaken only after a detailed analysis of the noise reduction requirements is made and needed noise insulation features included in the design. Conventional construction, but with closed windows and fresh air supply system or air conditioning will normally suffice.

Normally Unacceptable: New construction or development should generally be discouraged. If new construction or development does proceed, a detailed analysis of the noise reduction requirements must be made and needed noise insulation features included in the design.

Clearly Unacceptable: New construction or development should generally not be undertaken.

Source: Governor’s Office of Planning and Research, 2017. 7145/San Dimas MCTA 20-0005
Initial Study/Mitigated Negative Declaration

❖ SECTION 4.13 – NOISE ❖
City of San Dimas General Plan Noise Element
The City of San Dimas adopted its update to the General Plan in September 1991. The City of San Dimas General Plan Noise Element has the following goals, policies and actions that apply to proposed project:

Goals Statement N-1A: To protect those existing regions of the City for which the noise environment is deemed acceptable and those locations throughout the City which are deemed “Noise-Sensitive.” Objective 1.1: Future projects within the City regarding the reduction of unnecessary noise near noisesensitive areas… Policy 1.1.4: Close attention should be paid to the noise evaluation in environmental impact statements
City of San Dimas Municipal Code (Title 8, Chapter 8.36) The City of San Dimas Municipal Code specifies that the allowable noise level in a low-density residential zone shall be the higher of either the actual measured ambient level or the following sound level (A-weighted) decibels: 50 (7 a.m. to 6 p.m.); 45 (6 p.m. to 10 p.m.); 40 (night).

4.13.5 Significance Thresholds
The City of San Dimas has not published explicit thresholds for use in determining significance of noise impacts under CEQA. In keeping with standard practice, two criteria were used for judging noise impacts. First, noise levels generated by the proposed project must comply with all relevant federal, state, and local standards and regulations. Noise impacts on the surrounding community are limited by local noise ordinances, which are implemented through investigations in response to nuisance complaints. It is assumed that all existing applicable regulations for the construction and operation of the proposed project would be enforced. In addition, the proposed project should not produce noise levels that are incompatible with adjacent noise-sensitive land uses.

The second measure of impact used in this analysis is a significant increase in noise levels above existing ambient noise levels as a result of the introduction of a new noise source. An increase in noise level due to a new noise source has a potential to adversely impact people.

Impact Analysis
a) Would the project result in generation of a substantial temporary or permanent increase in ambient noise levels in the vicinity of the project in excess of standards established in the local general plan or noise ordinance, or applicable standards of other agencies?
Less than Significant Impact
To the extent that they were to take place, construction activities, especially with heavy equipment operation, would create noise effects on and adjacent to the construction site. However, given that the proposed project would only allow a minor incremental increase in grading activity of less than five percent above already-approved levels, that additional noise would be di minimis, and by the nature of the action allowed under the MCTA there would be no long-term noise impacts. 7145/San Dimas MCTA 20-0005 Page 4.13-4
Initial Study/Mitigated Negative Declaration Page 1136 – 2053 December 2022 ❖ SECTION 4.13 – NOISE ❖
Therefore, noise associated with project construction and operation would not expose a land use to noise levels that are considered incompatible with or in excess of adopted standards, and impacts would be less than significant.
b) Would the project generation of excessive groundborne vibration or groundborne noise levels?
Less than Significant Impact
Vibration is sound radiated through the ground. Vibration can result from a source (e.g., subway operations, vehicles, machinery equipment, etc.) that causes the adjacent ground to move, thereby creating vibration waves that propagate through the soil to the foundations of nearby buildings. This effect is referred to as groundborne vibration. The peak particle velocity (PPV) or the root-meansquare (RMS) velocity is usually used to describe vibration levels. PPV is defined as the maximum instantaneous peak of the vibration level, while RMS is defined as the square root of the average of the squared amplitude of the level. PPV is typically used for evaluating potential building damage, while RMS velocity in decibels (VdB) is typically more suitable for evaluating human response (FTA, 2018, pp. 110-111).

The background vibration velocity level in residential areas is usually around 50 VdB. The vibration velocity level threshold of perception for humans is approximately 65 VdB. A vibration velocity level of 75 VdB is the approximate dividing line between barely perceptible and distinctly perceptible levels for most people. Most perceptible indoor vibration is caused by sources within buildings such as operation of mechanical equipment, movement of people, or the slamming of doors. Typical outdoor sources of perceptible groundborne vibration are construction equipment, steel-wheeled trains, and traffic on rough roads. If a roadway is smooth, the groundborne vibration from traffic is rarely perceptible. The range of interest is from approximately 50 VdB to 100 VdB, which is the general threshold where minor damage can occur in fragile buildings (FTA, 2018, p. 120).

Given that the proposed project would only allow an incremental increase in grading activity of less than five percent above already-approved level, that additional groundborne vibration or groundborne noise levels would be di minimis, and by the nature of the action allowed under the MCTA there would be no long-term impacts. Therefore, impacts would be less than significant. c) For a project located within the vicinity of a private airstrip or an airport land use plan or, where such a plan has not been adopted, within two miles of a public airport or public use airport, would the project expose people residing or working in the project area to excessive noise levels?
No Impact
The closest public airport is Brackett Field in the City of La Verne, approximately 2.8 miles to the northeast. As shown in Figure 4.9-1, the project site is outside of land use compatibility zones and noise contours for Brackett Field. Therefore, the project would not expose people residing or working in the project area to excessive noise levels and no impact would occur. 7145/San Dimas MCTA 20-0005 Page 4.13-5
Initial Study/Mitigated Negative Declaration Page 1137 – 2053 December 2022 ❖ SECTION 4.14 – POPULATION AND HOUSING ❖

4.14 Population and Housing
Less than
Potentially
Significant
Impact
Significant
Impact with
Mitigation
Less than
Significant
Impact
No
Impact Would the project:

Incorporated
a) Induce substantial unplanned
population growth in an area, either
directly (for example, by proposing
new homes and businesses) or
indirectly (for example, through
extension of roads or other
X
X
infrastructure)?
b) Displace substantial numbers of
existing people or housing,
necessitating the construction of
replacement housing elsewhere?
a) Would the project induce substantial unplanned population growth in an area, either directly (for example, by proposing new homes and businesses) or indirectly (for example, through extension of roads or other infrastructure)? No Impact
The population of the city of San Dimas is forecast to increase by approximately 800 between 2016 and 2045, and employment in the City is forecast to increase by 1,400 between 2016 and 2045. The number of households in the city is expected to increase by about 200 over the 2016-2045 period, as shown below in Table 4.14-1 (CDF, 2021; SCAG, 2020; US Census, 2022).10 Table 4.14-1

CITY OF SAN DIMAS DEMOGRAPHIC FORECAST
2016 2045 Difference, Percent
2021 to 2045 Difference,
2021 - 2045
Population 34,200
12,100
11,500
35,000
12,300
12,900
800
200

2.3%
Households 1.7%
Employment 1,400 12.2%
Sources: SCAG, 2020; US Census, 2022
10 Note that the SCAG 2020 housing and population forecasts for the city of San Dimas are obsolete. The Regional Housing Needs Assessment (RHNA) allocation for the City of San Dimas issued by the California Department of Housing and Community Development for the 2021-2029 period is for 1,248 units (SCAG, 2021). The average household size in the city of San Dimas in 2021 was 2.77 persons. The estimated number of households, and population, in the city in 2029—assuming the city achieves its RHNA allocation—are shown below in Table 4.17-2. 7145/San Dimas MCTA 20-0005 Page 4.14-1
Initial Study/Mitigated Negative Declaration Page 1138 – 2053 December 2022 ❖ SECTION 4.14 – POPULATION AND HOUSING ❖
Table 4.14-2

CITY OF SAN DIMAS DEMOGRAPHIC ESTIMATES
Assuming achievement of Regional Housing Needs Assessment allocation, 2021-2029 2021 2029 Difference, Percent
2021 - 2029 Difference,
2021 - 2029
Population
Households
34,003
12,289
37,460
13,537
3,457
1,248

10.2%

10.2%
Sources: CDF, 2021; SCAG, 2020; US Census, 2022
Since the project site is already planned for and mostly developed with single-family residences, implementation of the proposed increase in allowable grading would not involve additional development of residential or employment-generating land uses beyond current plans. Therefore, project implementation would not cause direct population growth or employment growth and would not indirectly induce population growth through employment growth. Implementation would not extend roads or infrastructure. No impact would occur.
b) Would the project displace substantial numbers of existing people or housing, necessitating the construction of replacement housing elsewhere? No Impact
The increase in allowable grading would be in the rear sections of parcels; currently 29 are developed with single-family homes and seven are vacant. Grading in accordance with the proposed project would not involve demolition of existing residences. Therefore, project implementation would not displace residents or housing, and no impact would occur. 7145/San Dimas MCTA 20-0005 Page 4.14-2
Initial Study/Mitigated Negative Declaration Page 1139 – 2053 December 2022 ❖ SECTION 4.15 – PUBLIC SERVICES ❖

4.15 Public Services
Less than
Potentially
Significant
Impact
Significant
Impact with
Mitigation
Less than
Significant
Impact
No
Impact Would the project:

Incorporated
Would the project result in substantial adverse physical impacts associated with the provision of new or physically altered governmental facilities, need for new or physically altered governmental facilities, the construction of which could cause significant environmental impacts, in order to maintain acceptable service ratios, response times or other performance objectives for any of the public services:
a) Fire protection?
b) Police protection?
c) Schools?
X
X
X
X
X
d) Parks?
e) Other public facilities?
a) Fire Protection?
No Impact
Fire prevention, fire protection and emergency response services for the City of San Dimas are provided by contract with the Los Angeles County Fire Department (LACoFD). There are two fire stations in the city. Fire Station 141 is the closest to the project site and is located at 1124 W. Puente, approximately 0.8 miles west of the project site. Travel time to the project site from Station 141 is approximately three minutes. (City of San Dimas, 2022b)(Google Maps, 2022a).

The project site is located in a Very High Fire Hazard Severity Zone Local Responsibility Area (CAL FIRE, 2020). The project would be in compliance with applicable portions of the City of San Dimas Municipal Code, Chapter 15.51: Fire Code. The project would also be consistent with the 2019 edition of the California Fire Code (CFC) and the 2018 edition of the International Fire Code (IFC), as adopted and amended by the City of San Dimas.

The project covers an area of approximately 92 acres and consists of expanding the allowable grading (cut and fill) on each of the 36 residential lots in the project site area by 1,000 cubic yards (cy) per lot, or a total of 36,000 cy. The increase in allowable grading is to permit owners to grade backyards.

The project is within the service area of the LACoFD stations and would not result in an increase in the population in the surrounding area. It is not expected to significantly affect the existing service capacity of the LACoFD. No new or expanded fire department facilities would be required. The project’s demands on fire protection services would have no impact. b) Police Protection?
No Impact
Law enforcement services are provided to the City of San Dimas by contract with the Los Angeles County Sheriff’s Department (LACoSD). As a part of that service, LACoSD maintains a station in San 7145/San Dimas MCTA 20-0005 Page 4.15-1
Initial Study/Mitigated Negative Declaration Page 1140 – 2053 December 2022 ❖ SECTION 4.15 – PUBLIC SERVICES ❖
Dimas, located at 270 S. Walnut Avenue. The San Dimas Station is the central location for 18 patrol deputies, one motorcycle reserve deputy, three team leaders, three special assignment officers, one team sergeant, two community service assistants, one law enforcement technician (crime prevention officer), and one school resource officer. (City of San Dimas, 2022d) As indicated earlier, the project covers an area of approximately 92 acres and consists of expanding the allowable grading (cut and fill) on each of the 36 residential lots in the project site area; the increase in allowable grading is to permit owners to grade backyards. The project is within the service area of the San Dimas station and would not result in an increase in the population in the surrounding area, nor is it expected to affect the existing service capacity of the LACoSD. No new or expanded police protection facilities would be required. Therefore, no impacts on police protection services would occur.
c) Schools?
No Impact
The project site is located within the Covina-Valley Unified School District (C-VUSD). CV-USD provides public education for over 11,000 students and includes nine elementary schools, three middle schools, three high schools, one alternative education high school and one online learning academy (C-VUSD, 2022b, p13). C-VUSD schools serving the project site include Barranca Elementary School (grades K-5), Sierra Vista Middle School (grades 6-8), and South Hills High School (grades 9-12). Barranca Elementary School is 3.52 miles driving distance west of the project site at 727 S Barranca Avenue, Covina. Sierra Vista Middle School is 2.4 miles northwest of the project site at 777 E Puente Street, Covina. South Hills High School is 4.1 miles southwest of the project site at 645 S Barranca Avenue, Covina.

The project consists of expanding the allowable grading (cut and fill) on each of the 36 residential lots in the project site by 1,000 cubic yards (cy) per lot to permit owners to grade backyards. The project does not propose any new residential uses. Therefore, no impact on schools would occur. d) Parks?
No Impact
Recreational services in the city of San Dimas are provided by the City’s Parks and Recreation Department, which maintains 14 parks, sports facilities, and recreation centers (City of San Dimas, 2022e). The City currently has approximately 177 acres of parks and land for public use (City of San Dimas, 2022e).

The project does not propose any new residential land uses and is not anticipated to add new residents to the city. Therefore, no impact on parks would occur. e) Other Public Facilities?
No Impact
Library services in the city are provided by the Los Angeles County Library System, which is comprised of 85 regional and community libraries, one institutional library and three bookmobiles (Los Angeles County Public Library, 2022a). Within the city of San Dimas, there is one library, the San 7145/San Dimas MCTA 20-0005 Page 4.15-2
Initial Study/Mitigated Negative Declaration Page 1141 – 2053 December 2022 ❖ SECTION 4.15 – PUBLIC SERVICES ❖
Dimas Library located at 145 N Walnut Avenue (Los Angeles County Public Library, 2022b). The San Dimas Library is located approximately 4.5 miles northeast of the project site.

The project does not propose any new residential land uses and is not anticipated to add new residents to the city. Therefore, no impact on libraries or other public facilities would occur. 7145/San Dimas MCTA 20-0005 Page 4.15-3
Initial Study/Mitigated Negative Declaration Page 1142 – 2053 December 2022 ❖ SECTION 4.16 – RECREATION ❖

4.16 Recreation
Less than
Potentially
Significant
Impact
Significant
Impact with
Mitigation
Less than
Significant
Impact
No
Impact Would the project:

Incorporated
a) Would the project increase the use of
existing neighborhood and regional
parks or other recreational facilities
such that substantial physical
deterioration of the facility would
occur or be accelerated?
b) Does the project include recreational
facilities or require the construction
or expansion of recreational facilities
which might have an adverse
X
X
physical effect on the environment?
a) Would the project increase the use of existing neighborhood and regional parks or other recreational facilities such that substantial physical deterioration of the facility would occur or be accelerated?
No Impact
Recreational services in the City of San Dimas are managed by the Landscape Maintenance Division of the City’s Parks and Recreation Department, which maintains 14 city-operated recreational facilities, including 12 parks, a Swim and Racquet Club, and the Sportsplex. The City’s park acreage standard is 2.0 acres of land per 1,000 population for neighborhood parks and 3.5 acres of land per 1,000 population for community parks (City of San Dimas, 2022).

The parks nearest to the project include Walnut Creek Habitat & Open Space, located approximately

0.42-mile northeast of the project site, and Walnut Creek Community Regional Park located approximately 0.46 miles northwest from the project site. (See Figure 4.16-1) The project consists of expanding the allowable grading (cut and fill) on each of the 36 residential lots in the project site by 1,000 cubic yards (cy) per lot, or a total of 36,000 cy. The increase in allowable grading is to permit owners to grade backyards. The residential population would not increase as a result of the proposed project. Therefore, there will be no increase in the use of existing neighborhood and regional parks or other recreation facilities and no impact on their physical deterioration.
7145/San Dimas MCTA 20-0005 Page 4.16-1
Initial Study/Mitigated Negative Declaration Page 1143 – 2053 December 2022 ❖ SECTION 4.16 – RECREATION ❖
Figure 4.16-1

NEARBY PARKS AND RECREATIONAL FACILITIES
7145/San Dimas MCTA 20-0005
Initial Study/Mitigated Negative Declaration

❖ SECTION 4.16 – RECREATION ❖
b) Does the project include recreational facilities or require the construction or expansion of recreational facilities which might have an adverse physical effect on the environment?
No Impact
As described above, the project does not propose new or expanded recreational facilities that would have potential adverse effects on the environment. Therefore, no impact would occur. 7145/San Dimas MCTA 20-0005 Page 4.16-3
Initial Study/Mitigated Negative Declaration Page 1145 – 2053 December 2022 ❖ SECTION 4.17 – TRANSPORTATION ❖

4.17 Transportation
Less than
Potentially
Significant
Impact
Significant
Impact with
Mitigation
Less than
Significant
Impact
No
Impact Would the project:

Incorporated
a) Conflict with a program plan,
ordinance or policy addressing the
circulation system, including transit,
roadway, bicycle and pedestrian
facilities?
b) Conflict or be inconsistent with CEQA
Guidelines section 15064.3,
subdivision (b)?
c) Substantially increase hazards due to
a geometric design feature (e.g.,
sharp curves or dangerous
intersections) or incompatible uses
(e.g., farm equipment)?
X
X
X
d) Result in inadequate emergency
access? X
The proposed increase in allowable grading would not involve development or operation of land uses. Therefore, the analysis in this Section focuses on construction impacts only. a) Would the project conflict with a program plan, ordinance or policy addressing the circulation system, including transit, roadway, bicycle and pedestrian facilities? No Impact
The following City, County and regional plans, ordinances and policies would apply to the project.

City of San Dimas General Plan Circulation Element
The City of San Dimas General Plan Circulation Element sets forth roadway classifications, roadway and intersection operation goals, and objectives and policies regarding public transit, bicycle and pedestrian infrastructure, parking, and transportation demand management (TDM) (City of San Dimas, 1991).

City of San Dimas Municipal Code
City of San Dimas Municipal Code Section 10.32.030 designates truck routes in the City, including state highways under Caltrans jurisdiction (QCode, 2021). The two roadways within the project site, Calle Cristina and Paseo Lucinda, are both local streets. Sidewalks are present on both sides of both roadways; no bicycle facilities are present. The proposed increase in allowable grading would not generate operational vehicle trips or involve alterations of existing roadways or construction of driveways intersecting existing roadways. Grading projects conforming with the proposed project 7145/San Dimas MCTA 20-0005 Page 4.17-1
Initial Study/Mitigated Negative Declaration Page 1146 – 2053 December 2022 ❖ SECTION 4.17 – TRANSPORTATION ❖
would involve transportation of small numbers of off-road construction equipment during brief grading operations.

Project implementation would not conflict with the City of San Dimas Municipal Code or Circulation Element. No adverse impact would occur.
b) Would the project conflict or be inconsistent with CEQA Guidelines section 15064.3, subdivision (b)?
No Impact
CEQA Guidelines Section 15064.3, Determining the Significance of Transportation Impacts, sets forth requirements for use of vehicle miles traveled (VMT) as a method of determining the significance of transportation impacts. The City of San Dimas City Council adopted guidelines for transportation impact analysis (TIA Guidelines) using VMT providing project screening criteria and guidance for VMT assessments in October 2020.

The City TIA Guidelines set forth three screening criteria to determine whether a project can be presumed to have a less-than-significant impact.

Transit Priority Area (TPA) Screening:

Projects located within a TPA may be presumed to have a less than significant impact absent substantial evidence to the contrary. A TPA is defined as a half mile area around an existing major transit stop or an existing stop along a high-quality transit corridor per the definitions below. ‘Major transit stop’ means a site containing an existing rail transit station, a ferry terminal served by either a bus or rail transit service, or the intersection of two or more major bus routes with a frequency of service interval of 15 minutes or less during the morning and afternoon peak commute periods. A ‘high-quality transit corridor’ means a corridor with fixed route bus service with service intervals no longer than 15 minutes during peak commute hours. The project site is not in a TPA and this criterion does not apply to the project.

Low VMT Area Screening
Residential and office projects located within a low VMT-generating area may be presumed to have a less than significant impact absent substantial evidence to the contrary. Locations within a lowVMT generating area are identified using the San Gabriel Valley Council of Governments (SGVCOG) VMT Evaluation Tool, which in turn uses the SCAG travel forecasting model. The project site is presumed to not be in a low-VMT generating area based on the land use type (detached single-family residential) and this criterion does not apply to the project.

Project Type Screening
A list of project types is presumed to generate less-than-significant VMT impacts. One of the listed project types is projects generating fewer than 110 net new daily trips. The project consists of an increase in allowable grading. The project would not involve development of land uses that would generate VMT. The project type criterion therefore applies to the proposed project and no impact would occur.
7145/San Dimas MCTA 20-0005 Page 4.17-2
Initial Study/Mitigated Negative Declaration Page 1147 – 2053 December 2022 ❖ SECTION 4.17 – TRANSPORTATION ❖
c) Would the project substantially increase hazards due to a geometric design feature (e.g., sharp curves or dangerous intersections) or incompatible uses (e.g., farm equipment)?
No Impact
The project does not propose modifications to roadways or construction of driveways intersecting with existing roadways; project implementation would not create a roadway design hazard. Grading projects undertaken pursuant to the proposed project would involve transportation of small numbers of offroad construction equipment on roadways in the area. Trucks hauling construction equipment occasionally use local streets in residential areas and are not considered incompatible uses. No impact would occur.
d) Would the project result in inadequate emergency access? Less than Significant Impact
During grading operations in accordance with the proposed project, lanes and sidewalks may be temporarily closed off. Parking and staging for such grading operations would meet the requirements of the City of San Dimas Public Works Department Engineering Division. This is an existing requirement affecting all construction projects in the City affecting public roadway rights-of-way and/or travel lanes, and thus, no mitigation is required to ensure enforcement. Impacts would be less than significant.
7145/San Dimas MCTA 20-0005 Page 4.17-3
Initial Study/Mitigated Negative Declaration Page 1148 – 2053 December 2022 ❖ SECTION 4.17 – TRIBAL CULTURAL RESOURCES ❖

4.18 Tribal Cultural Resources
Less than
Potentially
Significant
Impact
Significant
Impact with
Mitigation
Less than
Significant
Impact
No
Impact Would the project:

Incorporated
a) Cause a substantial adverse change in
the significance of a tribal cultural
resource, defined in Public Resources
Code section 21074 as either a site,
feature, place, cultural landscape that
is geographically defined in terms of
the size and scope of the landscape,
sacred place, or object with cultural
value to a California Native American
tribe, and that is:
i) Listed or eligible for listing in the
California Register of Historical
Resources, or in a local register
of historical resources as defined
in Public Resources Code
X
section 5020.1(k)?
ii) A resource determined by the
lead agency, in its discretion and
supported by substantial
evidence, to be significant
pursuant to criteria set forth in
subdivision (c) of Public
Resources Code Section 5024.1.

In applying the criteria set forth
in subdivision (c) of Public
X
Resource Code Section 5024.1,
the lead agency shall consider
the significance of the resource
to a California Native American
tribe.

4.18.1 Methods
Information from the Phase I Cultural Resources Inventory Report, dated August 18, 2022 (see Appendix D), prepared by UltraSystems for the San Dimas Municipal Code Text Amendment 20- 0005 Project describes the research for and analysis of potential cultural resources data, including Tribal Cultural Resources (TCRs) conducted for the project. This research included a cultural resources record search by the SCCIC, a SLF record search by the NAHC, and a pedestrian survey assessment (see Section 4.5).

No prehistoric archaeological resources were observed during the field survey. Previous cultural resources surveys within the 0.5-mile radius resulted in a single archaeological site and no historicera sites being recorded. During the cultural resources record search at the SCCIC, no prehistoric resources were found within the project boundary. The results of the pedestrian assessment indicate it is highly unlikely that prehistoric properties would be adversely affected by construction of the 7145/San Dimas MCTA 20-0005 Page 4.18-1
Initial Study/Mitigated Negative Declaration Page 1149 – 2053 December 2022 ❖ SECTION 4.17 – TRIBAL CULTURAL RESOURCES ❖
project. The cultural resource study findings at the SCCIC suggest that there is a low potential for finding prehistoric resources.

One potential resource (as defined by Public Resources Code § 21074) has been noted (“NAHC Sacred Land File Records Search” in Appendix D of this IS/MND). A TCR site was documented within a 0.5- mile radius of the project site in the NAHC’s SLF search, though its location and description were not provided.

As discussed in Section 4.5, the NAHC recommended contacting the Gabrielino Band of Mission Indians – Kizh Nation to learn further information about the SLF site. Therefore, UltraSystems sent a letter to the Gabrielino-Kizh Nation, along with the other eight tribal contacts provided by the NAHC. a) Would the project cause a substantial adverse change in the significance of a tribal cultural resource, defined in Public Resources Code section 21074 as either a site, feature, place, cultural landscape that is geographically defined in terms of the size and scope of the landscape, sacred place, or object with cultural value to a California Native American tribe, and that is:
i) Listed or eligible for listing in the California Register of Historical Resources, or in a local register of historical resources as defined in Public Resources Code section 5020.1(k)?
No Impact
The Cultural Resources investigation determined that there are no TCRs listed or eligible for listing in the California Register of Historic Resources (CRHR) as defined in Public Resources Code § 5020.1(k) within the project site or within a 0.5-mile radius surrounding the project site. Therefore, no impact would occur.
ii) A resource determined by the lead agency, in its discretion and supported by substantial evidence, to be significant pursuant to criteria set forth in subdivision (c) of Public Resources Code Section 5024.1. In applying the criteria set forth in subdivision (c) of Public Resource Code Section 5024.1, the lead agency shall consider the significance of the resource to a California Native American tribe.

Less than Significant Impact
Assembly Bill 52 (AB 52) requires meaningful consultation with California Native American Tribes regarding potential impacts on TCRs, as defined in Public Resources Code § 21074. TCRs are sites, features, places, cultural landscapes, sacred places, and objects with cultural value to a California Native American tribe that are either eligible or listed in the California Register of Historical Resources or local register of historical resources (California Natural Resources Agency [CNRA], 2007).

As part of the AB 52 process, Native American tribes must submit a written request to a lead agency to be notified of projects within their traditionally and culturally affiliated area. The lead agency (City) must provide written, formal notification to those tribes within 14 days of deciding to undertake a project. The tribe must respond to the lead agency within 30 days of receiving this notification if they want to engage in consultation on the project, and the lead agency must begin the consultation process within 30 days of receiving the tribe’s request. Consultation concludes when 7145/San Dimas MCTA 20-0005 Page 4.18-2
Initial Study/Mitigated Negative Declaration Page 1150 – 2053 December 2022 ❖ SECTION 4.17 – TRIBAL CULTURAL RESOURCES ❖
either (1) the parties agree to mitigation measures to avoid a significant effect on a TCR, or (2) a party, acting in good faith and after reasonable effort, concludes mutual agreement cannot be reached.

In addition, the City is conducting Senate Bill 18 (SB 18) Government Code § 65352.3(a) consultation with Native Americans on General Plan proposals for the purposes of preserving or mitigating impacts to places, features, and objects described in § 5097.5 and § 5091.993 of the Public Resources Code that are located within the City’s jurisdiction. The SB 18 process requires that the City make an attempt to contact local tribes for the purpose of opening consultations between the City and the tribal governments. Following legislation guidelines, tribes have a 90-day period in which to request consultation (Public Resources Code § 21080.3.a(s)).

In compliance with AB 52, letters were sent by the City of San Dimas’ Planning Department (City) to all applicable Native American Tribes, asking if they wanted to participate in consultation. Luis Torrico, Planning Manager with the City’s Planning Department, has taken the lead for this process.

The letters were sent May 22, 2022 to the following tribes:
•
•
•
•
•
•
•
Gabrieleno Band of Mission Indians – Kizh Nation,
Gabrieleno/Tongva San Gabriel Band of Mission Indians,
Gabrielino/Tongva Nation,
Gabrielino Tongva Indians of California Tribal Council, Gabrielino-Tongva Tribe,
Santa Rosa Band of Cahuilla Indians,
Soboba Band of Luiseno Indians.

At this time the AB 52 and SB 18 response periods have passed with no tribes requesting consultation. With that, the consultation has been concluded.

A potential resource as defined by Public Resources Code § 21074 has been noted (Attachment C:
“NAHC Sacred Land File Records Search” in Appendix D to this S/MND). A traditional cultural site was documented within a half-mile radius of the project site in the NAHC’s SLF search, though its location and description were not provided. The NAHC recommended contacting the Gabrielino Band of Mission Indians – Kizh Nation to learn further information about the SLF site. A letter to the Gabrielino-Kizh Nation inquired about the SLF site, but there was no reply (Appendix D). The project site has not been recommended for historic designation for prehistoric resources or TCRs.

No prehistoric archaeological resources were observed during the field survey. The previous cultural resources surveys within the 0.5-mile radius resulted in one prehistoric archaeological site being recorded. During the cultural resources record search at the SCCIC, no prehistoric resources were identified within the project boundary. The results of the pedestrian assessment indicate it is highly unlikely that prehistoric properties will be adversely affected by construction of the project. The cultural resource study findings at the SCCIC suggest that there is a low potential for finding resources. Therefore, impacts are expected to be less than significant.

With no tribes requesting consultation there are no TCR recommended mitigation measures. 7145/San Dimas MCTA 20-0005 Page 4.18-3
Initial Study/Mitigated Negative Declaration Page 1151 – 2053 December 2022 ❖ SECTION 4.19– UTILITIES AND SERVICE SYSTEMS ❖

4.19 Utilities and Service Systems
Less than
Potentially
Significant
Impact
Significant
Impact with
Mitigation
Less than
Significant
Impact
No
Impact Would the project:

Incorporated
a) Require or result in the relocation or
construction of new or expanded
water, wastewater treatment or
storm water drainage, electric
power, natural gas, or X
telecommunications facilities, the
construction or relocation of which
could cause significant
environmental effects?
b) Have sufficient water supplies
available to serve the project and
reasonably foreseeable future
development during normal, dry and
multiple dry years?
c) Result in a determination by the
wastewater treatment provider
which serves or may serve the
project that it has adequate capacity
to serve the project’s projected
demand in addition to the provider’s
existing commitments?
X
X
d) Generate solid waste in excess of
State or local standards, or in excess
of the capacity of local infrastructure,
or otherwise impair the attainment
of solid waste reduction goals?
e) Comply with federal, state, and local
management and reduction statutes
and regulations related to solid
waste?
X
X
a) Would the project require or result in the relocation or construction of new or expanded water, wastewater treatment or storm water drainage, electric power, natural gas, or telecommunications facilities, the construction or relocation of which could cause significant environmental effects?
No Impact
The project covers an area of approximately 92-acres and consists of expanding the allowable grading (cut and fill) on each of the 36 residential lots in the project site by 1,000 cubic yards (cy) per lot, or a total of 36,000 cy. The increase in allowable grading is to permit owners to grade backyards.

The project does not propose any new residential or other utility uses and there would be no impact on relocation or construction of facilities
7145/San Dimas MCTA 20-0005 Page 4.19-1
Initial Study/Mitigated Negative Declaration Page 1152 – 2053 December 2022 ❖ SECTION 4.19– UTILITIES AND SERVICE SYSTEMS ❖
Water Treatment: Impacts on water treatment capacity are addressed below in Section 4.19.b. The Project has no significant water demands. Sufficient water supplies and water treatment capacity are available in the region, and there would be no project impacts on water treatment facilities.

Wastewater Treatment: Wastewater from San Dimas is conveyed by the City’s sewers and which are maintained by the Los Angeles County Sanitation District (LACSD) (City of San Dimas, 2022g) to LACSD’s San Jose Creek Water Reclamation Plant (SJCWRP) located at 1965 Workman Mill Road, Whittier, CA 90601 (LACSD, 2022a), approximately 13 miles southwest of the project site. The SJCWRP has capacity of 100 million gallons per day (mgd); average effluent flows in 2021 were 62.64 mgd (Table 1-1, p1-1, LACSD, 2022b); and residual capacity is 37.36 mgd. Project operation is not expected to generate any significant average wastewater per day.

The project does not propose any new residential or other water or wastewater uses. Therefore, there would be no impact on wastewater treatment.

Stormwater Drainage: As shown in Figure 4.19-1, there are no existing storm drains within the project site but there are catch basins at either end of Calle Cristina, specifically two located at 1615 Calle Cristina and two located at the start of the 1500 block of Calle Cristina at the intersection of Calle Cristina and Calle Francesca. The discharge points for these catch basins are unknown.

Project drainage and water quality components would be required to comply with the City of San Dimas Municipal Code Chapter 14.11, Stormwater Management and Discharge. Chapter 14.11 requires that new development projects maximize, to the maximum extent practicable, the percentage of permeable surfaces to allow more percolation of stormwater into the ground; and minimize, to the maximum extent practicable, the amount of stormwater directed to impermeable areas and to the municipal storm drainage system (City of San Dimas, 2021a).

The project does not propose any new residential or other stormwater related uses. However, any new development has to follow the appropriate codes. Therefore, impact on stormwater would be less than significant.

Electric Power: Electric power for the City of San Dimas is provided by Southern California Edison (SCE) (City of San Dimas, 2022f). The proposed project is located in a developed area, and infrastructure for providing electric power to the area is well established. SCE typically utilizes existing utility corridors to reduce environmental impacts, and has energy-efficiency programs to reduce energy usage and maintain reliable service throughout the year (SCE, 2020). Any future development would be constructed in accordance with all applicable California Code of Regulations Title 24 provisions.

The project does not propose any new residential or other construction or relocation of electrical power facilities. Therefore, impact on Electrical Power would be less than significant.

Natural Gas: The Southern California Gas Company (SoCalGas) is the primary distributor of retail and wholesale natural gas across Southern California, including the City of San Dimas. SoCalGas provides services to residential, commercial, and industrial consumers, and also provides gas for electric generation customers. In its 2020 California Gas Report, SoCalGas analyzed a 15-year demand period, from 2020-2035, to determine its ability to meet projected demand (California Gas and Electric Utilities, 2020. p. 96).
7145/San Dimas MCTA 20-0005 Page 4.19-2
Initial Study/Mitigated Negative Declaration Page 1153 – 2053 December 2022 ❖ SECTION 4.19– UTILITIES AND SERVICE SYSTEMS ❖
Figure 4.19-1

LOS ANGELES COUNTY STORM FACILITIES MAP
7145/San Dimas MCTA 20-0005 Page 4.19-3
Initial Study/Mitigated Negative Declaration Page 1154 – 2053 December 2022 ❖ SECTION 4.19– UTILITIES AND SERVICE SYSTEMS ❖
SoCalGas expects total gas demand to decline 1 percent annually from 2018 to 2035 as a result of modest economic growth, and CPUC-mandated energy efficiency (EE) standards and programs and California Senate Bill 350 (Chapter 547, Statutes of 2015) goals (California Gas and Electric Utilities, 2020, p. 96). Therefore, anticipated natural gas supply is adequate to meet demand in the SoCalGas region, and the proposed project is not expected to impact this determination.

Thus, project development would not require construction or expansion of natural gas facilities, and there would be no impact.

Telecommunications Facilities: Telecommunication services, including internet, phone, and television, for the city of San Dimas are provided by Spectrum and Frontier Communications (City of San Dimas, 2022f).

The proposed project would not interfere with operation of Spectrum or Frontier’s facilities, and there would be no impact.
b) Would the project have sufficient water supplies available to serve the project and reasonably foreseeable future development during normal, dry and multiple dry years?
No Impact
Water Supplies
The project site lies within the service area of the Golden State Water Company (GSWC) San Dimas System. GSWC obtains water supplies from the following sources: imported water from northern California purchased through Three Valleys Municipal Water District (TVMWD); groundwater from the Main San Gabriel Groundwater Basin; treated groundwater and surface water purchased from Covina Irrigating Company; and treated water purchased from Walnut Valley Water District (Stetson, 2021, p. 6-3). GSWC forecasts that it will have sufficient water supplies to meet demands in its service area over the 2025-2045 period.

Supply and demand comparisons for normal, single-dry-year, and multiple-dry-year conditions are shown below in Tables 4.19-2, 4.19-3, and 4.19-4 (Stetson, 2021, pp. 4-6, 6-54, 7-11 – 7-13). Water demand projections are based on growth projections from the Southern California Association of Governments (SCAG), which in turn are based on forecasts according with developments pursuant to general plan land use designations (Stetson, 2021, p. 3-6). The proposed project would conform with the existing General Plan land use designation; thus, water use from the proposed project is accounted for in GSWC’s water demand forecast.

The Project has no significant water demands. Sufficient water supplies and water treatment capacity are available in the region, and there would be no project impacts on water supplies. 7145/San Dimas MCTA 20-0005 Page 4.19-4
Initial Study/Mitigated Negative Declaration Page 1155 – 2053 December 2022 ❖ SECTION 4.19– UTILITIES AND SERVICE SYSTEMS ❖
Table 4.19-2

GSWC SAN DIMAS SYSTEM WATER SUPPLIES AND DEMANDS, AVERAGE WATER CONDITIONS Supply Source 2025 2030 2035 2040 2045
Groundwater
from Main San
Gabriel
3,000 3,000 3,000 3,000 3,000
Groundwater
Basin
Imported water
from
California
Covina Irrigating
Company:
northern 7,053
500
7,096
500
7,140
500
7,183
500
7,227
500
Purchased Water
Walnut
Water
Valley
District: 200 200 200 200 200
Purchased Water
Supplies: Total
Demands
10,753
10,753
0 10,796
10,796
0 10,840
10,840
0 10,883
10,883
0 10,927
10,927
Difference 0
Source: Stetson Engineers, 2021
Table 4.19-3

GSWC WATER SUPPLIES AND DEMANDS, SINGLE DRY YEAR CONDITIONS 2025 2030 2035 2040 2045
Supplies 10,402
10,402
0 10,444
10,444
0 10,485
10,485
0 10,527
10,527
0 10,569
10,569
0 Demands
Difference
Source: Stetson Engineers, 2021
Table 4.19-4

GSWC WATER SUPPLIES AND DEMANDS, MULTIPLE DRY YEAR CONDITIONS 2025 2030 2035 2040 2045
First Year
Fifth Year
Supplies 11,280
11,280
0 9,359
9,359
0 11,325
11,325
0 9,397
9,397
0 11,371
11,371
0 9,434
9,434
0 11,416
11,416
0 9,472
9,472
0 11,462
11,462
0 9,510
9,510
0 Demands
Difference
Supplies
Demands
Difference
Source: Stetson Engineers, 2021
7145/San Dimas MCTA 20-0005 Page 4.19-5
Initial Study/Mitigated Negative Declaration Page 1156 – 2053 December 2022 ❖ SECTION 4.19– UTILITIES AND SERVICE SYSTEMS ❖
c) Would the project result in a determination by the wastewater treatment provider which serves or may serve the project that it has adequate capacity to serve the project’s projected demand in addition to the provider’s existing commitments? No Impact
As described under threshold 4.19 a) above, the volume of wastewater generated by the project is not expected to be significant and represents only a small fraction of the existing daily capacity of the wastewater treatment facility serving the area. Therefore, the wastewater anticipated to be generated by the project would be within the existing capacity of the wastewater treatment provider and no impacts would occur.
d) Would the project generate solid waste in excess of State or local standards, or in excess of the capacity of local infrastructure, or otherwise impair the attainment of solid waste reduction goals?
No Impact
Solid waste disposal services for San Dimas are provided by Waste Management, Inc., a private company under contract with the City.

In 2019, the latest year for which data are available, approximately 94% of the solid waste landfilled from the city of San Dimas was disposed of at the three landfills described below in Table 4.19-5.

Table 4.19-5

LANDFILLS SERVING SAN DIMAS
Facility and
Nearest
City/Community cubic yards
Remaining
Capacity,
Daily
Permitted
Disposal
Actual Daily
Disposal,
tons1
Residual Daily
Disposal
Capacity, tons
Estimated
Closing Date
Capacity, tons
El Sobrante 143,977,170 16,054
17,500,000
82,954,873
11,398
7,011
4,850
4,656
989
2051
2036
2063
Landfill, Corona,
Riverside County
Olinda Alpha
Landfill, Brea,
Orange County
Simi Valley
8,000
10,792 5,942
Landfill &
Recycling Center,
Simi Valley,
Ventura County
Total 244,432,043 34,846 23,259 11,587 Not applicable
1 Daily disposal calculated based on annual disposal tonnage assuming 300 operating days per year: that is, six days per week less certain holidays. Simi reports 64,750 Tons per week, calculated over six days equals 10,792 tons per day.

Sources: CalRecycle. 2019a. Jurisdiction Disposal by Facility; CalRecycle. 2022[a, b and c]. Solid Waste Information System (SWIS): SWIS Facility/Site Search; CalRecycle. 2022d. 2019 Landfill Summary Tonnage Report. 7145/San Dimas MCTA 20-0005 Page 4.19-6
Initial Study/Mitigated Negative Declaration Page 1157 – 2053 December 2022 ❖ SECTION 4.19– UTILITIES AND SERVICE SYSTEMS ❖
The project does not propose any new residential or other frequent solid waste generation related uses. However, future grading may produce a one-off solid waste impact. Grading can include redistribution, removal or addition of soil and can only be determined on a case-by-case basis which is currently unknown. Any new development has to follow the appropriate codes.

The three landfills serving San Dimas have combined residual disposal capacity of nearly 12,000 tons per day. Thus, project solid waste generation would not exceed available landfill capacity, and there would be no impacts.
e) Would the project comply with federal, state, and local management and reduction statutes and regulations related to solid waste?
No Impact
In 1989, the California Legislature enacted the California Integrated Waste Management Act (AB 939), in an effort to address solid waste problems and capacities in a comprehensive manner.

The law required each city and county to divert 50% of its waste from landfills by the year 2000.

Assembly Bill 341 (AB 341; Chapter 476, Statutes of 2011) increases the statewide waste diversion goal to 75% by 2020.

Senate Bill 1383 (SB 1383; California Health and Safety Code Sections 39730.5 et seq.) set targets to achieve a 50% reduction in the level of the statewide disposal of organic waste from the 2014 level by 2020 and a 75% reduction by 2025. The law is intended to reduce emissions of methane, a shortlived climate pollutant, from decomposition of organic waste in landfills, for the protection of people in at-risk communities as well as to reduce GHG emissions.

Section 5.408 (Construction Waste Reduction, Disposal, and Recycling) of the 2019 California Green Building Standards Code (CALGreen; Title 24, California Code of Regulations, Part 11) requires that at least 65% of the nonhazardous construction and demolition waste from nonresidential construction operations be recycled and/or salvaged for reuse. Any future construction would include diversion of at least 65% of demolition and construction waste for recycling or salvage in compliance with CALGreen Section 5.408.

The project does not propose any new residential or other significant solid waste to occur. The project would comply with federal, state, and local management and reduction statutes and regulations related to solid waste. Therefore, there would be no impact. 7145/San Dimas MCTA 20-0005 Page 4.19-7
Initial Study/Mitigated Negative Declaration Page 1158 – 2053 December 2022 ❖ SECTION 4.20 – WILDFIRE ❖

4.20 Wildfire
Less than If located in or near state Potentially
Significant
Impact
Significant
Impact with
Mitigation
Less than
Significant
Impact
responsibility areas or lands classified
as very high fire hazard severity
zones, would the project:

No
Impact
Incorporated
a) Substantially impair an adopted
emergency response plan or X
X
emergency evacuation plan?
b) Due to slope, prevailing winds, and
other factors, exacerbate wildfire
risks, and thereby expose project
occupants to, pollutant
concentrations from a wildfire or the
uncontrolled spread of a wildfire?
c) Require the installation or
maintenance of associated
infrastructure (such as roads, fuel
breaks, emergency water sources,
power lines or other utilities) that
may exacerbate fire risk or that may
result in temporary or ongoing
impacts to the environment?
X
X
d) Expose people or structures to
significant risks, including downslope
or downstream flooding or landslides,
as a result of runoff, post-fire slope
instability, or drainage changes?
a) If located in or near state responsibility areas or lands classified as very high fire hazard severity zones, would the project substantially impair an adopted emergency response plan or emergency evacuation plan?
Less than Significant Impact
As shown in Figure 4.20-1, the project site is located adjacent to a Very High Fire Hazard Severity Zone (VHFHSZ) State Responsibility Area (SRA) along its southern boundary. Figure 4.20-2 shows that the project site is located entirely within a VHFHSZ in a Local Responsibility Area (LRA).

Review of Figure 4.20-3 Los Angeles County Disaster Routes Map for the City of San Dimas (Los Angeles County Department of Public Works, 2008 map plot date) shows that the project site is not directly accessed by a road designated as a disaster route. However, an interchange between Via Verde and the Interstate 10 (I-10) freeway is located approximately 1,000 feet south of the project site, with the I-10 freeway being a designated “Freeway Disaster Route”. Via Verde can be directly accessed by Covina Hills Road, which is the southern boundary of the project site. 7145/San Dimas MCTA 20-0005 Page 4.20-1
Initial Study/Mitigated Negative Declaration Page 1159 – 2053 December 2022 ❖ SECTION 4.20 – WILDFIRE ❖
Figure 4.20-1

FIRE HAZARD SEVERITY ZONE - STATE RESPONSIBILITY AREA
7145/San Dimas MCTA 20-0005
Initial Study/Mitigated Negative Declaration

❖ SECTION 4.20 – WILDFIRE ❖
Figure 4.20-2

FIRE HAZARD SEVERITY ZONE - LOCAL RESPONSIBILITY AREA
7145/San Dimas MCTA 20-0005
Initial Study/Mitigated Negative Declaration

❖ SECTION 4.20 – WILDFIRE ❖
Figure 4.20-3

LOS ANGELES COUNTY DISASTER ROUTES MAP FOR THE CITY OF SAN DIMAS 7145/San Dimas MCTA 20-0005
Initial Study/Mitigated Negative Declaration

❖ SECTION 4.20 – WILDFIRE ❖
The County of Los Angeles through the Chief Executive Office’s Administrative Services carries out an Emergency Management function. Emergency Management has developed numerous Emergency/Disaster Plans and Annexes for large scale emergencies and disasters which includes wildfires, and there is a comprehensive emergency program in place for large-scale disasters (County of Los Angeles Chief Executive Office, 2022). In addition, the County of Los Angeles Fire Department provides fire protection services under contract to City of San Dimas and has specialist air and ground resources to tackle wildfires. The office has published many Emergency and Disaster Preparedness documents.

Project implementation would not block emergency access or hinder emergency evacuation because the project is not on a disaster route. Therefore, the project would have less than significant impact in this regard.
b) If located in or near state responsibility areas or lands classified as very high fire hazard severity zones, would the project due to slope, prevailing winds, and other factors, exacerbate wildfire risks, and thereby expose project occupants to, pollutant concentrations from a wildfire or the uncontrolled spread of a wildfire? Less than Significant Impact
As indicated in item a) above the project site is located in or near an SRA and lands classified as VHFHSZ. San Dimas faces the greatest ongoing threat from a wind-driven fire in the Wildland/Urban Interface area found in the hillsides and canyons in the northern part of the city according to the 2004 Natural Hazard Mitigation Plan. As shown on Figure 4.20-3 the project is not located within a Wildland Urban Interface (WUI). The Los Angeles County Fire Department provides Fire Protection services to the City of San Dimas. Adherence to the California Building Code and Fire Code would reduce impact to less than significant.
c) If located in or near state responsibility areas or lands classified as very high fire hazard severity zones, would the project require the installation or maintenance of associated infrastructure (such as roads, fuel breaks, emergency water sources, power lines or other utilities) that may exacerbate fire risk or that may result in temporary or ongoing impacts to the environment?
Less than Significant Impact
As indicated in item a) above the project site is located in or near state responsibility areas or lands classified as very high fire hazard severity zones. The Los Angeles County Fire Department provides Fire Protection services to the City of San Dimas. Adherence to the California Building Code and Fire Code would reduce impact to less than significant impact. 7145/San Dimas MCTA 20-0005 Page 4.20-5
Initial Study/Mitigated Negative Declaration Page 1163 – 2053 December 2022 ❖ SECTION 4.20 – WILDFIRE ❖
Figure 4.20-3
FIRE HAZARD – WILDLAND-URBAN INTERFACE
7145/San Dimas MCTA 20-0005
Initial Study/Mitigated Negative Declaration

❖ SECTION 4.20 – WILDFIRE ❖
d) If located in or near state responsibility areas or lands classified as very high fire hazard severity zones, would the project expose people or structures to significant risks, including downslope or downstream flooding or landslides, as a result of runoff, post-fire slope instability, or drainage changes?
Less than Significant Impact
As indicated in item a) above the project site is located in or near state responsibility areas or lands classified as very high fire hazard severity zones. The Los Angeles County Fire Department provides Fire Protection services to the City of San Dimas. As discussed in Section 4.7 a) iv the risk of landslides is Less Than Significant Impact and Section 4.10 d) indicates that the project site is not in dam inundation area. Additionally, as part of all proposed future projects that require permits for grading, the individual homeowner will be required to submit a registered civil engineer’s report for soils and geology and a structural engineering report for any proposed retaining wall. Therefore, the project site has low potential for landslides and any potential future development of the proposed project would be in compliance with governing City grading and building codes, which would reduce potential project impacts related to potential slope failure to a Less than Significant Impact. 7145/San Dimas MCTA 20-0005 Page 4.20-7
Initial Study/Mitigated Negative Declaration Page 1165 – 2053 December 2022 ❖ SECTION 4.21 – MANDATORY FINDINGS OF SIGNIFICANCE ❖

4.21 Mandatory Findings of Significance
Less than
Significant
Impact with
Mitigation
Potentially
Significant
Impact
Less than
Significant
Impact
No
Impact Does the project have:

Incorporated
a) The potential to substantially degrade
the quality of the environment,
substantially reduce the habitat of a
fish or wildlife species, cause a fish or
wildlife population to drop below
self-sustaining levels, threaten to
eliminate a plant or animal X
community, substantially reduce the
number or restrict the range of a rare
or endangered plant or animal or
eliminate important examples of the
major periods of California history or
prehistory?
b) Impacts that are individually limited,
but cumulatively considerable?
("Cumulatively considerable" means
that the incremental effects of a
project are considerable when viewed
in connection with the effects of past
projects, the effects of other current
projects, and the effects of probable
future projects)?
c) Environmental effects which will
cause substantial adverse effects on
human beings, either directly or
indirectly?
X
X
a) Does the project have the potential to substantially degrade the quality of the environment, substantially reduce the habitat of a fish or wildlife species, cause a fish or wildlife population to drop below self-sustaining levels, threaten to eliminate a plant or animal community, substantially reduce the number or restrict the range of a rare or endangered plant or animal or eliminate important examples of the major periods of California history or prehistory?
Less than Significant Impact with Mitigation Incorporated Section 4.4 of this document addresses impacts on biological resources. The project site is located in a highly-urbanized area that is surrounded by residential and commercial properties, which provides low habitat value for special-status plant and wildlife species (including species listed by state or federal agencies as “candidate” or “sensitive” species). However, the trees on the project site as well as trees in the BSA could provide suitable roosting habitat for nesting birds protected by the MBTA. If construction occurs during the nesting season, indirect impacts on migratory birds could occur from increased noise, vibration, and dust during construction. This could adversely affect the breeding behavior of some birds, and lead to the loss (take) of eggs and chicks, or nest abandonment. 7145/San Dimas MCTA 20-0005 Page 4.21-1
Initial Study/Mitigated Negative Declaration Page 1166 – 2053 December 2022 ❖ SECTION 4.21 – MANDATORY FINDINGS OF SIGNIFICANCE ❖
Impacts to nesting birds would be significant without mitigation. Implementation of mitigation measures BIO-6 through BIO-12 would reduce impacts to less than significant. Furthermore, oak trees were observed onsite and are protected under the Tree Preservation Ordinance of the San Dimas Municipal Code. Impacts to these trees would be a significant impact without mitigation.

Furthermore, California black walnut (Juglans californica) is present in the project site as well.

Implementation of mitigation measures BIO-1 through BIO-18 would reduce impacts to less than significant.

Section 4.5 of this document addresses potential impacts on Cultural Resources. According to records at the SCCIC, two previous cultural resource surveys have included a portion of the project area, and 21 surveys have been conducted within the 0.5-mile radius project buffer but not within the project APE. As a result of the field survey, no historic buildings were identified within the project site. No other cultural resources were observed during the survey. Therefore, it is unlikely that historical and archaeological resources would be adversely affected by construction of the project.

However, grading activities associated with development of the project would cause new subsurface disturbance and may result in the unanticipated discovery of unique historic and/or prehistoric archeological resources. In the event of an unanticipated discovery, implementation of mitigation measures CUL-1 and CUL-2 would ensure that impacts on historical and archaeological resources would be less than significant.

Section 4.7 of this document addresses potential impacts on paleontological resources. Considering the number of fossil localities in the Puente Formation, and specifically Puente Formation shale, grading operations in accordance with the proposed project could damage fossils in Puente Formation rock onsite. Any substantial excavations should be closely monitored to collect any specimens quickly and professionally. In the event of an unexpected discovery, implementation of mitigation measure GEO-1 would ensure reduce impacts to paleontological resources or unique geologic features to less than significant affected.
b) Does the project have impacts that are individually limited, but cumulatively considerable? ("Cumulatively considerable" means that the incremental effects of a project are considerable when viewed in connection with the effects of past projects, the effects of other current projects, and the effects of probable future projects)? Less than Significant Impact with Mitigation Incorporated The proposed project would be consistent with regional plans and programs that address environmental factors such as air quality, water quality, and other applicable regulations that have been adopted by public agencies with jurisdiction over the project for the purpose of avoiding or mitigating environmental effects.

Sections 4.3, 4.8, and 4.13 of this Initial Study address potential impacts related to Air Quality, Greenhouse Gas Emission, and Noise, respectively. As detailed in Section 4.3, air quality impacts associated with project construction and operation would be less than significant and do not warrant mitigation. As detailed in Section 4.8, greenhouse gas impacts associated with project construction and operation would be less than significant and do not warrant mitigation. As detailed in Section 4.13, construction and operational noise impacts associated with the project site were found to be less than significant and do not warrant mitigation.

The project would create employment opportunities (during construction); employees from the local workforce would be hired during the construction phase of the project. The project is not of the scope 7145/San Dimas MCTA 20-0005 Page 4.21-2
Initial Study/Mitigated Negative Declaration Page 1167 – 2053 December 2022 ❖ SECTION 4.21 – MANDATORY FINDINGS OF SIGNIFICANCE ❖
or scale to induce people to move from outside of the project area to work at the proposed project.

The project does not include a housing component or otherwise support an increase in the resident population of the City and would utilize existing infrastructure for its operation. Therefore, indirect population growth resulting solely from the project would be less than significant.

Since the project would not increase environmental impacts after mitigation measures are incorporated, the incremental contribution to cumulative impacts is anticipated to be less than significant with mitigation incorporated.
c) Does the project have environmental effects which will cause substantial adverse effects on human beings, either directly or indirectly? Less than Significant Impact with Mitigation Incorporated As discussed in Sections 4.1 through 4.20 of this document, after the implementation of mitigation measures, potential adverse environmental effects were found to be less than significant on human beings, either directly or indirectly. Therefore, less than significant impacts would occur. 7145/San Dimas MCTA 20-0005 Page 4.21-3
Initial Study/Mitigated Negative Declaration Page 1168 – 2053 December 2022 ❖ SECTION 5.0 – REFERENCES ❖

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❖ SECTION 5.0 – REFERENCES ❖
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SCAQMD, 1993. CEQA Air Quality Handbook. Diamond Bar, CA. November. Accessed online at:
http://www.aqmd.gov/home/rules-compliance/ceqa/air-quality-analysishandbook/ceqa-air-quality-handbook-(1993), on August 16, 2022.

SCAQMD, 2008a. Draft Guidance Document – Interim CEQA Greenhouse Gas (GHG) Significance Threshold, October 2008. Accessed online at http://www.aqmd.gov/docs/defaultsource/ceqa/handbook/greenhouse-gases-(ghg)-ceqa-significancethresholds/ghgattachmente.pdf, on August 16, 2022.

SCAQMD, 2017a. Letter from Wayne Nastri, Executive Officer, South Coast Air Quality Management District, Diamond Bar, CA to Richard Corey, Executive Officer, California Air Resources Board, Sacramento, California re: Submittal of 2016 Air Quality Management Plan.

SCAQMD, 2017b. Final 2016 Air Quality Management Plan. South Coast Air Quality Management District. March 2017.

SCAQMD, 2022. Site Survey Site Report for Glendora (Laurel Avenue). Updated May 19, 2022. http://www.aqmd.gov/docs/default-source/clean-air-plans/air-quality-monitoringnetwork-plan/aaqmnp-glendora.pdf?sfvrsn=16. Accessed August 12, 2022.

Stetson Engineers, Inc. 2021. Golden State Water Company San Dimas System (GSWC). Final 2020 Urban Water Management Plan. Accessed online at:
https://wuedata.water.ca.gov/public/uwmp_attachments/9623822867/FINAL%20GSWC %2D%20San%20Dimas%202020%20UWMP%2Epdf, on July 25, 2022.

SWRCB (California State Water Resources Control Board), 2013. Water Quality Order No. 2013-0001- DWQ. Available online at
https://www.waterboards.ca.gov/water_issues/programs/stormwater/docs/phsii2012_ 5th/order_final.pdfAccessed on August 2, 2022.

SWRCB (California State Water Resources Control Board), 2012. Construction General Permit. https://www.waterboards.ca.gov/water_issues/programs/stormwater/docs/constpermit s/wqo_2009_0009_complete.pdf
Takata Associates, 1991. City of San Dimas Final Environmental Impact Report, SCH #91011017, General Plan Revision. May 1991. Accessed online at:
https://cms8.revize.com/revize/sandimasca/Document_Center/Department/Community %20development/Planning%20division/Development%20Projects%20Environmental% 20Info/FINAL-EIR-1991.pdf, on April 19, 2022.

The Planning Center, 1983. Focused Environmental Impact Report, Via Verde Parcel ‘D’, Specific Plan No. 11, Zone Change 83-1. Draft February 1983. Final certified on April 26, 1983. Accessed online at:
7145/San Dimas MCTA 20-0005 Page 5-8
Initial Study/Mitigated Negative Declaration Page 1176 – 2053 December 2022 ❖ SECTION 5.0 – REFERENCES ❖
https://cms8.revize.com/revize/sandimasca/Document_Center/Department/Community %20development/Planning%20division/Development%20Projects%20Environmental% 20Info/SP-11-Via-Verde-Parcel-D-Final-EIR.pdf, on April 19, 2022.

UltraSystems, 1977. Final Environmental Impact Report, Tentative Tract No. 33026, Zone Change No. 182, Via Verde Area III. January 1977. Accessed online at:
https://sandimasca.gov/Document_Center/Department/Community%20development/Pl anning%20division/Development%20Projects%20Environmental%20Info/TentativeTract-No.-33026-Via-Verde-Area-III-Final-EIR.pdf, on April 19, 2022.

US Census Bureau (USCB). 2020. Longitudinal Employer-Household Dynamics (LEHD). OnTheMap.

Accessed online at: http://onthemap.ces.census.gov/, on January 25, 2022.

Soil Survey Staff, 2022. Natural Resources Conservation Service, United States Department of Agriculture, Web Soil Survey: Custom Soil Resource Report, Los Angeles County, Southeastern Part, California. Available at https://websoilsurvey.sc.egov.usda.gov/.

Downloaded on July 8, 2022.

USEPA, 2022a. 8-Hour Ozone (2015) Nonattainment Area State/Area/County Report: Green Book.

U.S. Environmental Protection Agency. Current Data as of June 30, 2022. [https://www3.epa.gov/airquality/greenbook/jncs.html#CA]. Accessed August 4, 2022.

USEPA, 2022b. PM-10 (1987) Maintenance Area (Redesignated from Nonattainment) State/Area/County Report: Green Book. U.S. Environmental Protection Agency Current [https://www3.epa.gov/airquality/greenbook/pmcs.html#CA]. Data as of June 30, 2022.

Accessed August 4, 2022.

USEPA, 2022c. PM-2.5 (2012) Designated Area State/Area/County Report: Green Book. U.S.

Environmental Protection Agency. Current Data as of June 30, 2022. [https://www3.epa.gov/airquality/greenbook/kbcs.html#CA]. Accessed August 4, 2022.

USEPA, 2022d. Carbon Monoxide (1971) Maintenance Area (Redesignated from Nonattainment) State/Area/County Report: Green Book. U.S. Environmental Protection Agency Current [https://www3.epa.gov/airquality/greenbook/cmcs.html#CA]. Data as of June 30, 2022.

Accessed 19 July 2020.

USEPA, 2022e. Nitrogen Dioxide (1971) Maintenance Area (Redesignated from Nonattainment) State/Area/County Report.: Green Book. U.S. Environmental Protection Agency Current [https://www3.epa.gov/airquality/greenbook/nmcs.html]. Data as of June 30, 2022.

Accessed August 4, 2022.

USEPA, 2022f. Nitrogen Dioxide (NO2) Pollution Accessed online at https://www.epa.gov/no2- pollution/basic-information-about-no2. Accessed on August 12, 2022.

USEPA, 2022g. Basic Information about Carbon Monoxide (CO) Outdoor Air Pollution. Accessed online at https://www.epa.gov/co-pollution/basic-information-about-carbon-monoxideco-outdoor-air-pollution. Accessed on August 12, 2022.

USEPA, 2022h. Particulate Matter (PM) Basics. Accessed online at https://www.epa.gov/pmpollution/particulate-matter-pm-basics. Accessed on August 12, 2022. 7145/San Dimas MCTA 20-0005 Page 5-9
Initial Study/Mitigated Negative Declaration Page 1177 – 2053 December 2022 ❖ SECTION 5.0 – REFERENCES ❖
USEPA, 2022i. What is Ozone? Accessed online at https://www.epa.gov/ozone-pollution-and-yourpatients-health/what-ozone. Accessed on August 12, 2022.

USEPA (U.S. Environmental Protection Agency), 2022j. EPA Waters GeoViewer. Available at https://www.epa.gov/waterdata/waters-geoviewer. Accessed on September 2, 2022.

WRCC, 2022a. Meteorological station location information from National Oceanographic and Atmospheric Administration, San Dimas Fire FC 95 California meteorological station (#047749). Accessed online at https://wrcc.dri.edu/cgi-bin/cliMAIN.pl?ca7749, on August 16, 2022.

WRCC, 2022b. Meteorological station location information from National Oceanographic and Atmospheric Administration, Pomona Fairplex, California meteorological station (#047050). Accessed online at https://wrcc.dri.edu/cgi-bin/cliMAIN.pl?ca7050,on August 16, 2022.

USFWS (United States Fish and Wildlife Service). 1997. Coastal California Gnatcatcher Presence/Absence Survey Protocol. Available at:
https://www.fws.gov/sites/default/files/documents/survey-protocol-for-coastalcalifornia-gnatcatcher.pdf Accessed on September 29, 2022.

USFWS (United States Fish and Wildlife Service), 2000. Southwestern Willow Flycatcher Protocol Revision. Available at: https://www.wrcrca.org/species/survey_protocols/SWWFlycatcher.2000.protocol.pdf. Accessed on June 30, 2022.

USFWS (United States Fish and Wildlife Service). 2001a. Least Bell’s Vireo Survey Guidelines.

Available at: https://www.fws.gov/sites/default/files/documents/survey-protocol-forleast-bells-vireo.pdf Accessed on September 29, 2022.

USFWS (United States Fish and Wildlife Service). 2001b. Minimum Qualifications for Coastal California Gnatcatcher Recovery Permits Available at:
https://www.fws.gov/sites/default/files/documents/minimum-qualifications-forcoastal-california-gnatcatcher.pdf Accessed on September 29, 2022.

USFWS (United States Fish and Wildlife Service), 2021. Birds of Conservation Concern 2021 List.

Available at https://www.fws.gov/media/birds-conservation-concern-2021pdf. Accessed on September 10, 2022.

USFWS (United States Fish and Wildlife Service). 2022a. Information for Planning, and Consultation (IPaC). Carlsbad Fish and Wildlife Office. IPaC Official Species List. Consultation Code:
0061097-2022 Available at http://ecos.fws.gov/ipac/. Downloaded on July 6, 2022.

USFWS, Environmental Conservation Online System (ECOS). 2022b. Species Profile. Available at https://ecos.fws.gov/ecp/species-reports. Accessed on January 7, 2022.

USFWS (United States Fish and Wildlife Service), 2022c. USFWS Critical Habitat Portal:
http://ecos.fws.gov/crithab/. Latest database search conducted on May 13, 2022.US 7145/San Dimas MCTA 20-0005 Page 5-10
Initial Study/Mitigated Negative Declaration Page 1178 – 2053 December 2022 ❖ SECTION 5.0 – REFERENCES ❖
USFWS, 2022d. National Wetlands Inventory. U.S. Department of the Interior, Fish and Wildlife Service, Washington, D.C. Available at https://www.fws.gov/wetlands/Data/Mapper.html.

Accessed on September 3, 2022.

USGS (US Geological Survey). 2017. Watershed Boundary Dataset (WBD) HUC10. Data layer in California Department of Fish and Wildlife (CDFW) Biogeographic Information and Observation System (BIOS). Accessed online at: https://www.wildlife.ca.gov/Data/BIOS, on March 4, 2022.

USGS (U.S. Department of the Interior, United States Geological Survey), 2018. San Dimas Quadrangle, California, 7.5-Minute Series [map]. Scale 1:24,000. Prepared for U.S. Topo: The National Map. Available at https://ngmdb.usgs.gov/topoview/. Downloaded on January 8, 2022.

USGS, 2022. National Hydrography Dataset (ver. USGS National Hydrography Dataset Best Resolution (NHD) for Hydrologic Unit (HU) 12. Available at https://www.usgs.gov/core-sciencesystems/ngp/national-hydrography/access-national-hydrography-products. Downloaded on January 12, 2022.

US Geological Survey (USGS). 2020. Areas of Land Subsidence in California. Accessed online at:
https://ca.water.usgs.gov/land_subsidence/california-subsidence-areas.html, April 2, 2022.
on
WRCC, 2022 Western U.S. Climate Historical Summaries, Western Regional Climate Center. https://wrcc.dri.edu/cgi-bin/cliMAIN.pl?ca7749. Accessed August 12, 2022.

Zeiner, D.C., W.F. Laudenslayer, Jr., K.E. Mayer, and M. White, eds. 1988-1990. California's Wildlife.

Vol. I-III. California Department of Fish and Game, Sacramento, California. Updated September, 2000. Available at https://wildlife.ca.gov/Data/CWHR/Life-History-andRange. Accessed on January 12, 2022. 7145/San Dimas MCTA 20-0005 Page 5-11
Initial Study/Mitigated Negative Declaration Page 1179 – 2053 December 2022 ❖ SECTION 6.0 – LIST OF PREPARERS ❖

6.0 LIST OF PREPARERS

6.1 Lead Agency (CEQA)
Luis Torrico, Planning Manager
City of San Dimas
245 E. Bonita Avenue
San Dimas, CA 91773
T: (909) 394-6208
E: [email protected]
Ken Fichtelman, Associate Planner
City of San Dimas
245 East Bonita Avenue
San Dimas, CA 91773
T: (909) 394-6256
E: [email protected]

6.2 Project Applicant
City of San Dimas
245 East Bonita Avenue
San Dimas, CA 91773

6.3 UltraSystems Environmental, Inc.

6.3.1 Environmental Planning Team
Betsy Lindsay, M.A., MURP, ENV SP, Project Director
Robert Reicher, MBA, Senior Project Manager-Consultant
Billye Breckenridge, BA, ENV SP, Assistant Project Manager/GIS Manager Michael Milroy, MA, Project Manager

6.3.2 Technical Team
Amir Ayati, Staff Scientist
Megan Black, M.A., Archaeological Technician
Billye Breckenridge, BA, ENV SP, Assistant Project Manager/GIS Manager Allison Carver, BS, Senior Biologist
Stephen Chesterman, BEng, Principal GIS Consulting
Gulben Kaplan, MS, GIS Analyst
Swarna Kumaresan, MS, Environmental Engineer
David Luhrsen, BS, Word Processing
Audrey McNamara, BA, Biologist
Michael Milroy, MA, Project Manager
Stephen O’Neil, MA, RPA, Cultural Resources Manager
Margaret Partridge, MURP, AICP, LEED Green Associate, ENV SP, Senior Project Manager Victor Paitimusa, B.A., Assistant Project Manager
Robert Reicher, MBA, Senior Project Manager
7145/San Dimas MCTA 20-0005
Initial Study/Mitigated Negative Declaration

❖ SECTION 6.0 – LIST OF PREPARERS ❖
Michael Rogozen, D. Env, Senior Principal Engineer
Isha Shah, M.S., Staff Engineer/Scientist
Andrew Soto, BA, Word Processing/Technical Editing
Tarjeen Sumaia, B.S., Environmental Planner

6.3.3 Subconsultant
ENGEO Incorporated
Randall Rettig, Staff Water Resources Engineer
Jonathan Buck, GE, QSD
Julia A. Moriarty, GE, QSD
7145/San Dimas MCTA 20-0005 Page 6-2
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7.0 MITIGATION MONITORING AND REPORTING PROGRAM
The Mitigation Monitoring and Reporting Program (MMRP) has been prepared in conformance with § 21081.6 of the Public Resources Code and § 15097 of the California Environmental Quality Act (CEQA) Guidelines, which requires all state and local agencies to establish monitoring or reporting programs whenever approval of a project relies upon a Mitigated Negative Declaration (MND) or an Environmental Impact Report (EIR). The MMRP ensures implementation of the measures being imposed to mitigate or avoid the significant adverse environmental impacts identified through the use of monitoring and reporting. Monitoring is generally an ongoing or periodic process of project oversight; reporting generally consists of a written compliance review that is presented to the decision-making body or authorized staff person.

It is the intent of the MMRP to: (1) provide a framework for document implementation of the required mitigation; (2) identify monitoring/reporting responsibility; (3) provide a record of the monitoring/reporting; and (4) ensure compliance with those mitigation measures that are within the responsibility of the lead agency and/or project applicant to implement.

Table 7.0-1 lists impacts, mitigation measures and project improvement measures adopted by the City of San Dimas in connection with approval of the proposed project, level of significance after mitigation, responsible and monitoring parties, and the project phase in which the measures are to be implemented. Only those environmental topics for which mitigation is required are listed in this Mitigation, Monitoring and Reporting Program.
7145/San Dimas MCTA 20-0005 Page 7-1
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MITIGATION MONITORING AND REPORTING PROGRAM

1. ENFORCEMENT AGENCY RESPONSIBLE/

MONITORING
PARTY

TOPICAL AREA
IMPACT

MONITORING
ACTION MITIGATION MEASURE 2. MONITORING AGENCY

3. MONITORING PHASE

4.4 Biological Resources
Threshold 4.4a) Would the MM BIO-1: Vegetation Community Replacement Plan project have a substantial Sensitive natural communities (vegetation communities) are communities that adverse effect, either directly or through habitat
modifications, on any
species identified as a
candidate, sensitive, or
special status species in
local or regional plans,
policies, or regulations, or
by the California
have a limited distribution and are often vulnerable to the environmental effects of projects. These communities may or may not contain special-status species or their habitats. For purposes of this BRE, sensitive natural communities are considered to include vegetation communities listed in the CNDDB and communities (alliances and/or associations) listed in the CDFW Natural Communities List with a rarity rank of S1 (critically imperiled), S2 (imperiled), or S3 (vulnerable) (CDFW, 2022).

Replacement and maintenance of natural resources will ecological viability as required in the FEIR (The Planning Center, 1983)), General Plan (Takata Associates, 1991), and as per CEQA § 21081.6 Findings or Negative Declarations; Reporting or Monitoring Project Changes; Effect on Environment; Conditions (CEQA § 21081.6). Department of Fish and Game or U.S. Fish and
Wildlife Service? As the project contains multiple areas of protected sensitive vegetation communities, including California walnut groves, coast live oak woodland and forest, coast prickly pear scrub, California sagebrush-black sage scrub, and/or California buckwheat scrub (if occupied by CAGN or other listed species), and if impacts cannot be avoided, then the following mitigation would be implemented.

1. City of San Dimas

2. City of San Dimas Project Field
Applicant Verification 3. Prior to the Start of
Delimit Sensitive Vegetation Communities: A qualified biologist will survey the Project Construction project site and field verify the mapped locations and extent of sensitive vegetation communities, per the 2022 surveys (Appendix A, BRE report; UltraSystems, 2022) If discrepancies are observed, then corrections will be made to determine the extent of impact. For areas that are inaccessible due to topography and/or dense vegetation, a visual estimate may be used to map the vegetation extent via binocular survey, photo documentation, drawn on aerial imagery, then digitized using GIS to estimate the number, maturity, condition, and habitat value of the sampled area.

Mitigation will then be fulfilled as follows.

Compensatory mitigation is required for impacts to sensitive natural communities per § 21081.6 Findings or Negative Declarations; Reporting or Monitoring Project Changes; Effect on Environment; Conditions. The following compensatory mitigation is provided:

Mitigation Bank. The primary, streamlined approach for compensatory mitigation is payment into a local mitigation bank. The project should ideally be within the 7145/San Dimas MCTA 20-0005
Initial Study/Mitigated Negative Declaration

❖ SECTION 7.0 – MITIGATION MONITORING AND REPORTING PROGRAM ❖

1. ENFORCEMENT AGENCY RESPONSIBLE/

MONITORING
PARTY

TOPICAL AREA
IMPACT

MONITORING
ACTION MITIGATION MEASURE 2. MONITORING AGENCY

3. MONITORING PHASE
service area for the mitigation bank providing available credits for “in kind” impacts to the aforementioned sensitive vegetation communities. The minimum compensatory mitigation ratio for sensitive vegetation communities will be 3:1. If the project applicant uses an existing mitigation bank, such as Soquel Canyon Mitigation Bank: (https://landveritasmitigationbanks.com/soquel.html) or similar, the fee fully mitigates onsite impacts and no further mitigation for is necessary per BIO-1.

Vegetation Communities Replacement Plan (in lieu of mitigation bank). In the event impacts cannot be mitigated through an approved mitigation bank, then on-site and/or off-site replanting is required at a 3:1 ratio for the impacted vegetation. The replacement plantings will be planted to mimic the surrounding natural habitat in an effort to retain the functions and values per each tree-dominated vegetation community.

A certified arborist, qualified biologist, or licensed landscape architect will prepare a Vegetation Communities Replacement Plan (“habitat mitigation and monitoring plan;";" HMMP) which shall be submitted to the City of San Dimas and CDFW (as feasible) for approval. A project-specific HMMP will include location and techniques for habitat restoration//revegetation. The HMMP will define the proposed mitigation site, mitigation site preparation, installation of native vegetation replacement, seed palette, irrigation schedule, maintenance, monitoring, reporting, and performance success criteria. The HMMP will recommend feasible measures for mitigating any impacts to trees, sensitive native vegetation water quality, riparian, and biological resources from project implementation. The minimum monitoring period for restoration and replanting will be 5-years.

In addition to protecting sensitive vegetation communities, BIO-1 may also serve to satisfy a portion of the requirements of the City of San Dimas tree protection ordinances (§§ 16.42.020, 16.42.090, 18.162.060, 18.162. 070, and 18.162.100) as mandated by the City’s required tree removal permit for Mature Significant Trees.

MM BIO-2: Project Limits and Designated Areas

1. City of San Dimas

2. City of San Dimas
To avoid impacts to sensitive biological resources, the property owners will collectively implement the following measures prior to project construction and commencement of any ground-disturbing activities or vegetation removal.

Project
Applicant
Field
Verification 3. Prior to the Start of
Project Construction
• Specifications for the project boundary, limits of construction, project-related parking, storage areas, laydown sites, and equipment storage areas will be 7145/San Dimas MCTA 20-0005 Page 7-3
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1. ENFORCEMENT AGENCY RESPONSIBLE/

MONITORING
PARTY

TOPICAL AREA
IMPACT

MONITORING
ACTION MITIGATION MEASURE 2. MONITORING AGENCY

3. MONITORING PHASE
mapped and clearly marked in the field with temporary fencing, screens, silt fencing, signs, stakes, flags, rope, cord, or other appropriate markers. • All markers will be maintained until the completion of activities in that area.

Construction employees will be informed to strictly limit their activities, vehicles, equipment, and construction materials to the proposed project footprint and designated staging areas and routes of travel. The construction area(s) shall be the minimal area necessary to complete the project and shall be specified in the construction plans.
• The construction crew will inspect excavated areas daily to detect the presence of trapped wildlife. See BIO-15 Wildlife Entrapment Avoidance and BIO-16 Construction Best Management Practices, below.

MM BIO-3: General Vegetation and Wildlife Avoidance and Protection Measures
The BSA contains habitat which can support many wildlife species. The property owner shall implement the following general avoidance and protection measures to protect vegetation and wildlife, to the extent practical:
• Cleared or trimmed native vegetation and woody debris will be chipped and left onsite. If cleared or trimmed non-native, invasive vegetation are in the flowering and/or seeding/fruiting stages, then the seed heads will be bagged tightly and disposed of in a legal manner at an approved disposal site (landfill) as soon as possible to prevent regrowth and the spread of weeds.

1. City of San Dimas

2. City of San Dimas
Project
Applicant
Field
Verification 3. Prior to the Start of
Project
• The removal of native vegetation shall be avoided and minimized to the maximum extent practicable. Temporary impacts shall be returned to preexisting contours and revegetated with appropriate native species.

Construction
•
•
Vehicles and equipment will be free of caked mud or debris prior to entering a project site to avoid the introduction of new invasive weedy plant species.

To minimize construction-related mortalities of nocturnally active species such as mammals and snakes, it is recommended that all work be conducted during daylight hours. Nighttime work (and use of artificial lighting) will not be 7145/San Dimas MCTA 20-0005 Page 7-4
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MONITORING
PARTY

TOPICAL AREA
IMPACT

MONITORING
ACTION MITIGATION MEASURE 2. MONITORING AGENCY

3. MONITORING PHASE
permitted unless specifically authorized. If required, night lighting will be directed away from the preserved open space areas to protect species from direct night lighting. All unnecessary lights will be turned off at sunset to avoid attracting wildlife such as insects, migratory birds, and bats. •
•
If any wildlife is encountered during the course of project activities, said wildlife will be allowed to freely leave the area unharmed.

Wildlife will not be disturbed, captured, harassed, or handled. Animal nests, burrows and dens will not be disturbed without prior survey and authorization from a qualified biologist.
•
•
Covered trash receptacles will be placed at each designated work site and the contents will be properly disposed at least once a week. Trash removal will reduce the attractiveness of the area to opportunistic predators such as common ravens, coyotes, northern raccoons, and Virginia opossums.

The contractors and project applicant will ensure that storm water BMPs include erosion control measures for construction-related disturbance near undeveloped land with ponded water to avoid sedimentation of breeding grounds for special-status sensitive amphibians and invertebrates, such as the spadefoot toad.
• Post-construction lighting. The MCTA will ensure that construction specifications provide provisions to reduce light pollution, including downshielding or removal of motion sensor lighting, as this type of lighting can deter wildlife and impede movement throughout the area. Night lighting can disrupt the circadian rhythms of many wildlife species. Therefore, if night lighting is required at entry points, we recommend low level lighting. All non-essential lighting should be eliminated. The Project should avoid or limit the use of artificial light during the hours of dawn and dusk, as these intervals of time are when many wildlife species are most active.
7145/San Dimas MCTA 20-0005 Page 7-5
Initial Study/Mitigated Negative Declaration Page 1186 – 2053 December 2022 ❖ SECTION 7.0 – MITIGATION MONITORING AND REPORTING PROGRAM ❖ MM BIO-4: Focused Botanical Surveys
To avoid impacts to special-status plant species, a qualified biologist will survey the project site for the presence of special-status plant species that are likely to occur based on habitat, soils, elevation, climate, and other conditions of the project site.

The focused plant surveys will be conducted in accordance with the Protocols for Surveying and Evaluating Impacts to Special Status Native Plant Populations and Sensitive Natural Communities (CNPS, 2018) and the Guidelines for Conducting and Reporting Botanical Inventories for Federally Listed, Proposed, and Candidate Plants (USFWS, 2000). The surveys will be conducted in the field at appropriate times of the year to coincide with the growing season and different blooming periods and when optimum conditions for identification (generally blooms, fruits, and leaves) are present. Biologists will pay special attention to those habitat areas that appear to provide suitable habitat for special-status species.

A minimum of two surveys would be conducted during different seasons of the same year to adequately capture the floristic diversity of a site, with a focus on areas that will be directly or indirectly receiving impacts from project activities. Plant taxa that occur on site will be identified to the taxonomic level necessary to determine rarity and listing status, as feasible. Plant species will be identified by an expert botanist if a question of rarity and listing status occurs. Special-status plant species will be identified, recorded in field notes, counted or estimated, and mapped on an aerial map or with a GPS unit.

1. City of San Dimas

2. City of San Dimas
Project
Applicant
Field
Verification 3. Prior to the Start of
Project
Construction
Following completion of the focused botanical surveys, a focused botanical survey report will be prepared in accordance with agency guidelines. The report will: 1) summarize information regarding the habitat of the survey area and the habitat’s suitability for special-status plants; 2) assess the potential presence of specialstatus plants onsite; 3) analyze the potential impacts to special-status plants from project development; and 4) recommend, as appropriate, BMPs, avoidance and protection measures, and mitigation measures to reduce or avoid potential impacts to special-status plants. The report will include: 1) methods and results of the literature review and field surveys; 2) figures depicting the location of special-status plants; 3) a complete flora compendium; and 4) site photographs.

Because CDFW generally considers botanical surveys to be valid for a period of up to three years, some aspects of the proposed project may warrant periodic updated surveys for certain sensitive taxa, particularly if the project is proposed to occur over a protracted time frame, or in phases, or if surveys are completed during periods of drought.
7145/San Dimas MCTA 20-0005
Initial Study/Mitigated Negative Declaration

❖ SECTION 7.0 – MITIGATION MONITORING AND REPORTING PROGRAM ❖

1. ENFORCEMENT AGENCY RESPONSIBLE/

MONITORING
PARTY

TOPICAL AREA
IMPACT

MONITORING
ACTION MITIGATION MEASURE 2. MONITORING AGENCY

3. MONITORING PHASE
MM BIO-5: Habitat Assessment for Least Bell’s Vireo and Southwestern Willow Flycatcher
Potential indirect impacts to downstream riparian habitat may require a biologist with a valid Section 10(a)(1)(A) permit will perform a habitat assessment for the least Bell’s vireo (LBV) (Vireo bellii pusillus) and the southwestern willow flycatcher (SWFL) (Empidonax traillii extimus) to determine if the downstream riparian areas may support special-status species and project activities may cause an adverse effect (direct or indirect) to said species. 1. City of San Dimas

2. City of San Dimas If the qualified biologist determines there is potential for project activities to cause an adverse effect (direct or indirect) to special-status avian species, then the authorized biologist will conduct protocol LBV surveys in accordance with the United States Fish and Wildlife’s (USFWS) LBV Survey Guidelines (dated February 1992 and revised January 19, 2001 [USFWS, 2001]) and protocol SWFL surveys in accordance with the guidelines set forth by the USFWS and the United States Geological Survey (USGS) survey protocol for the SWFL (dated July 11, 2000 [USFWS, 2000] and revised June 22, 2010 [Sogge et al., 2010]). This habitat assessment report will be submitted to USFWS and the South Coast (Region 5) CDFW office within 45 days of survey effort completion. In addition, all survey efforts completed during the calendar year should be submitted to the abovementioned agencies (USFWS, 2001a).

Project
Applicant
Field
Verification 3. Prior to the Start of
Project
Construction
MM BIO-6: Focused Coastal California Gnatcatcher Surveys The BSA is located in the known distributional range of the California gnatcatcher (CAGN) and contains suitable coastal sage scrub habitat (coast prickly pear scrub, California sagebrush-black sage scrub, California buckwheat scrub) to potentially support this bird; therefore, focused surveys in accordance with the Coastal California Gnatcatcher Presence/Absence Survey Protocol (USFWS, 1997; survey protocol) will be required. The property owners will be responsible for retaining a qualified biologist holding a Section 10(a)(1)(A) permit issued by the USFWS to conduct focused surveys for CAGN. This authorized biologist will coordinate with the Carlsbad USFWS Office prior to survey.

1. City of San Dimas

2. City of San Dimas
Project
Applicant
Field
Verification 3. Prior to the Start of
Project
Construction
A minimum of six surveys shall be conducted at least one week apart, between March 15 and June 30. A minimum of nine surveys shall be conducted at least two weeks apart between July 1 and March 14. Surveys should be conducted between 7145/San Dimas MCTA 20-0005 Page 7-7
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the hours of 6:00 a.m. and 12:00 p.m. and shall avoid period of inclement conditions.

No more than 80 acres of suitable CAGN habitat should be surveyed per biologist per day.

If avoidance of occupied habitat is not possible, then payment into a mitigation bank or onsite restoration will occur (See BIO-1).

A survey report should then be prepared and submitted with 45 days from survey effort completion to the Carlsbad USFWS Office and the CDFW South Coast (Region 5) Office. The survey report should include the names and permit numbers of all surveyors, survey area locations, descriptions of and mapped extent of the vegetation communities in the survey area and areas adjacent. Number, age, sex, and applicable color band information for detected CAGNs should be reported by the authorized biologist.

Note: Incidental observations of raptors and sensitive avian species shall be recorded during the CAGN surveys; incidental species include but are not limited to:

Cooper’s hawk, merlin, golden eagle, burrowing owl, California spotted owl, longeared owl, coastal cactus wren, yellow warbler, and southern California rufouscrowned sparrow.

MM BIO-7: Focused Cactus Wren Surveys
The BSA is located in the known distributional range of the cactus wren (Campylorhynchus brunneicapillus) [CAWR] and contains suitable coastal sage scrub habitat (coast prickly pear scrub, California sagebrush-black sage scrub, California buckwheat scrub) to potentially support this bird; therefore, focused surveys for this species should occur within areas of suitable habitat.

1. City of San Dimas

2. City of San Dimas
Project
Applicant
Field
Verification 3. Prior to the Start of
Project Cactus wren and the CAGN (see BIO-6) occur within similar suitable habitats.

Providing that the authorized biologist with a Section 10(a)(1)(A) recovery permit for CAGN has the experience and expertise to conduct the CAWR survey, surveys may be conducted concurrently. If avoidance of occupied habitat is not possible, then payment into a mitigation bank or onsite restoration will occur (See BIO-1) Construction
7145/San Dimas MCTA 20-0005 Page 7-8
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MM BIO-8: Preconstruction Mountain Lion Surveys (for Natal Dens) The project occurs within the Southern California/Central Coast Evolutionary Significant Unit (ESA) of the mountain lion, which is currently a Candidate State Threatened species. As a Candidate species, protections are given as a listed status species would be protected, which is full protections under CESA.

Protections are for mountain lion wildlife corridors, and potential hunting, foraging habitat, and breeding opportunities within the area of the proposed MCTA. . A qualified biologist familiar with the mountain lion species behavior and life history should conduct pre-construction surveys within the project area and 500-foot buffer that occur within 30 days prior to project mobilization and ground-moving activities (clear, grub, grade, excavation, etc.)
A qualified biologist familiar with the mountain lion species behavior and life history should conduct surveys in areas that may provide possible habitat for mountain lion to determine the potential presence/absence of natal dens for the species. Surveys should be conducted when the species is most likely to be detected, during crepuscular periods at dawn and dusk. Survey results including negative findings should be submitted to CDFW prior to initiation of project activities.

1. City of San Dimas

2. City of San Dimas
Project
Applicant
Field
Verification 3. Prior to the Start of
Project
Construction
Should an active natal den be located within 500 feet of the project site, the applicant should cease work and inform CDFW with 24 hours. No construction activities should occur in the 500-foot buffer zone until a qualified biologist in consultation with CDFW establishes an appropriate setback from the den that would not adversely affect the successful rearing of the cubs. No construction activities or human intrusion should occur within the established setback until the cubs have been successfully reared or the cats have left the area.

If take or adverse impacts to mountain lion cannot be avoided either during project construction and over the life of the project, project proponent shall consult CDFW and must acquire a CESA Incidental Take Permit (pursuant to Fish & Game Code, §2080 et seq.).

If there are no adverse effects to the mountain lion habitat, then project activities may commence without further mitigation.
7145/San Dimas MCTA 20-0005 Page 7-9
Initial Study/Mitigated Negative Declaration Page 1190 – 2053 December 2022 ❖ SECTION 7.0 – MITIGATION MONITORING AND REPORTING PROGRAM ❖ MM BIO-9: Preconstruction Wildlife Surveys
To comply with California Fish and Game Code §§ 2050-2089, § 3511, § 4700, § 5050 and § 5515, the following measures will be implemented to minimize impacts to sensitive species which include, but are not limited to: southern California legless lizard, Crotch’s bumble bee, western spadefoot toad, large-blotched ensatina, coast range newt, two-striped garter snake, Blainville’s horned lizard, California glossy snake, and red diamond rattlesnake. The measures below will help to minimize or avoid direct and indirect impacts caused by project implementation to sensitive species.
•
•
•
The project applicant will retain a qualified biologist to conduct preconstruction wildlife surveys within the applicant’s APN (aka. project site) and associated conservation easements.

The survey will be conducted at least seven days prior to the onset of scheduled activities, (e.g., staging and stockpiling, structure removal, clear and grub, grading, fill, etc.). 1. City of San Dimas

2. City of San Dimas
Pre-construction surveys for special-status wildlife species will concentrate attention in areas with potential to detect protected species, their nests, or indicators of presence (i.e., tracks, middens, fur, pellets, claw marks, scat, burrows, and/or vocalizations); observations of special-status species and/or sign will be recorded and mapped. During the surveys, the biologist will also record incidental observations of non-special-status species and/or their sign.

Project
Applicant
Field
Verification 3. Prior to the Start of
Project
Construction
•
•
Upon completion of the pre-construction wildlife surveys, the qualified biologist will prepare a brief letter report summarizing methods, results, and recommendations for project commencement. If a greater than seven days lapse in construction-related activities occurs within the subject parcel then an additional pre-construction survey is required.

If it is determined that a federally-listed and/or state-listed or sensitive plant/wildlife species will be directly impacted by the project, the qualified biologist will consult with the USFWS in accordance with the Endangered Species Act § 7 and the CDFW in accordance with CESA under California Fish and Game Code § 2081(b), respectively. However, if the qualified biologist conducts thorough pre-construction surveys and determines there is no threat to special-status species, then construction may commence. 7145/San Dimas MCTA 20-0005 Page 7-10
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• Sensitive wildlife species and/or potential nesting sites will not be disturbed, captured, handled or moved.

MM BIO-10: 14-Day Preconstruction Burrowing Owl Surveys and Report A qualified biologist will conduct a preconstruction BUOW survey (Take Avoidance Survey) in accordance with the Staff Report on Burrowing Owl Mitigation (Staff Report) (CDFG, 2012) no less than 14 days prior to initiating ground disturbance activities. The survey shall be conducted in accessible portions of the Biological Study Area (BSA), a zone 500 feet out from the project site that contains BUOW essential habitat (nesting, foraging, wintering, and dispersal habitat). The survey will be conducted from sunrise to 10:00 a.m. or from two hours before sunset until evening twilight when weather conditions are conducive to BUOW observations.

The biologist shall walk belt transects spaced no more than 20 meters apart to allow 100 percent visual coverage of the survey area, and examine entrances of potential burrows and suitable man-made structures for BUOWs and signs of BUOW. The biologist shall identify, record, and map with a global positioning system (GPS) unit BUOWs and potential BUOW signs. Detailed notes, including observations of wildlife species encountered during the survey, shall be recorded in field notes. A final preconstruction BUOW survey (Take Avoidance Survey) shall be conducted within 24 hours prior to ground disturbance, following the survey methodology described above (CDFG 2012).

1. City of San Dimas

2. City of San Dimas
Project
Applicant
Field
Verification 3. Prior to the Start of
Project
Construction
Following the completion of the preconstruction BUOW surveys, the biologist shall prepare and electronically submit to the applicant a report summarizing the results of the survey. The report shall be prepared in accordance with the instructions described in the Staff Report. The applicant will submit one electronic copy to the project proponent and one electronic copy of the report to the City for review and concurrence prior to conducting project activities.
• The results of the 14-day preconstruction BUOW surveys will be valid for 14 days. If construction is delayed more than 14 days, then the 14-day preconstruction BUOW surveys must be repeated. That will require a change order.
7145/San Dimas MCTA 20-0005 Page 7-11
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•
•
If no BUOW or signs of BUOW are observed during the survey and concurrence is received from the City, project activities may begin and no further mitigation will be required.

If BUOW or signs of BUOW are observed during the survey, the site will be considered occupied and the BUOW may require noise and activity shielding BMPs and/or require passively relocation. The qualified biologist will notify the City and contact CDFW to assist in the development of avoidance, minimization, and mitigation measures prior to commencing project activities.

A passive relocation program (Burrowing Owl Mitigation Monitoring and Artificial Burrow and Exclusion Plan) may be necessary and will require approval by CDFW prior to commencing project activities.

MM BIO-11: Preconstruction Bat Surveys
The BSA provides suitable oak woodland habitat and other large trees and structures including buildings that provide roosting sites for several special-status bay species. Three sensitive bat species were determined to have a moderate potential to occur in the BSA due to presence of suitable habitat and recent occurrences data (CNDDB, 2022a). These species are pallid bat, western mastiff bat, and big free-tailed bat.

1. City of San Dimas

2. City of San Dimas
Within 30 days prior to commencement of vegetation removal, a preconstruction bat survey shall be conducted by a qualified biologist during nighttime hours for the presence of any roosting bats. Project
Applicant
Field
Verification 3. Prior to the Start of
Project Acoustic recognition technology shall be used for the bat survey if feasible and appropriate. If either a bat maternity roost or hibernacula (structures used by bats for hibernation) are present, a qualified biologist shall develop and implement appropriate protection measures for that maternity roost or hibernacula.

Construction
If either a maternity roost or hibernacula, which are structures used by bats for hibernation, is identified, a qualified biologist shall develop and implement appropriate protection measures for that maternity roost or hibernacula. These protection measures shall include, as appropriate, safely evicting non-breeding bats, establishment of avoidance buffers, or replacement of roosts at a suitable location. 7145/San Dimas MCTA 20-0005 Page 7-12
Initial Study/Mitigated Negative Declaration Page 1193 – 2053 December 2022 ❖ SECTION 7.0 – MITIGATION MONITORING AND REPORTING PROGRAM ❖ MM BIO-12: Preconstruction Breeding Bird Survey
To maintain compliance with the MBTA and Fish and Game Code and to avoid impacts or take of migratory non-game breeding birds and other native birds, their nests, young, and eggs, the following measures will be implemented. Impacts to nesting birds would be a potential significant impact if protected breeding birds are present, therefore, the measures below will help to reduce direct and indirect impacts caused by construction-related activities to less than significant levels. • If project activities cannot be avoided during February 15 through September 15, a qualified biologist will conduct a preconstruction breeding bird survey for active nests (adult birds, eggs, nestlings, fledglings, and those dependent upon the nest). The breeding bird nesting season is typically from but can vary slightly from year to year, usually depending on weather conditions. •
•
•
The survey will be conducted between three to seven days prior to the onset of scheduled activities and will include all potential nest sites, such as open ground, trees, shrubs, grasses, burrows, and structures during the breeding season. 1. City of San Dimas

2. City of San Dimas The project applicant will make every effort to conduct the pre-construction survey and subsequent removal of all physical features that could potentially serve as nest sites (e.g., staging and stockpiling, structure removal, clear and grub, grading, fill, etc.) to avoid impacts to nesting birds.

Project
Applicant
Field
Verification 3. Prior to the Start of
Project
Construction
If a breeding bird territory or an active bird nest is located during the preconstruction survey and will potentially be impacted, the site will be mapped and location provided to the construction foreman, City, and project applicant.

The qualified biologist will establish a buffer zone around the active nest, which will be delimited (fencing, stakes, flagging, orange snow fencing, etc.) at a minimum of 100 feet or as the qualified biologist determines is appropriate for the detected species. The biologist will determine the appropriate buffer size based on the planned activities and tolerances of the nesting birds. This noactivity buffer zone will not be disturbed until a qualified biologist has determined that the nest is inactive, the young have fledged, the young are no longer being fed by the parents, the young have left the area, or the young will no longer be impacted by project activities. Periodic monitoring by a biologist will be performed to determine when nesting is complete. Once the nesting cycle has finished, project activities may begin within the buffer zone. • If listed bird species are observed within a project site during the preconstruction survey, the biologist will immediately map the area and notify the appropriate resource agency to determine suitable protection measures 7145/San Dimas MCTA 20-0005 Page 7-13
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and/or mitigation measures and to determine if additional mitigation is necessary. Project activities may begin within the area only when concurrence is received from the appropriate resource agency.
• Birds or their active nests will not be disturbed, captured, handled or moved.

Active nests cannot be removed or disturbed; however, nests can be removed or disturbed if determined inactive by a qualified biologist.

If no breeding birds or active nests are observed during the preconstruction survey or they are observed and will not be impacted, project activities may begin and no further mitigation will be required.

MM BIO-13: Worker Environmental Awareness Program (WEAP) Prior to project construction activities, a qualified biologist will prepare and conduct a Worker Environmental Awareness Program (WEAP) to describe the biological constraints of the project.
• All personnel who will work within a project site will attend the WEAP prior to performing any work. The WEAP will include, but not be limited to: results of preconstruction surveys; description of sensitive biological resources potentially present within a project site; legal protections afforded the sensitive biological resources; BMPs for protecting sensitive biological resources (i.e., restrictions, avoidance, protection, and minimization measures); individual responsibilities associated with the project. The program will also include the reporting requirements if workers encounter a sensitive wildlife species (i.e., notifying the biological monitor or the construction foreman, who will then notify the biological monitor).

1. City of San Dimas

2. City of San Dimas
Project
Applicant
Field
Verification 3. Prior to the Start of
Project
Construction
•
•
A condition shall be placed on grading permits requiring a qualified biologist to conduct a training session for project personnel prior to grading.

Training materials will be language-appropriate for all construction personnel.

Upon completion of the WEAP, workers will provide their signature on a “signin sheet” stating that they attended the program, understand all protection measures, and will abide all the rules of the WEAP. A record of all trained personnel will be kept with the construction foreman at the project field 7145/San Dimas MCTA 20-0005 Page 7-14
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construction office and will be made available to any resource agency personnel.
• If new construction personnel are added to the project later, the construction foreman will ensure that new personnel receive training before they start working. The biologist will provide written hard copies of the WEAP and photos of the sensitive biological resources to the construction foreman.

MM BIO-14: Biological Monitor
A qualified project biologist shall monitor construction activities for the duration of the project to ensure that practicable measures are being employed to avoid incidental disturbance of habitat and species of concern outside the project footprint.

If special-status wildlife species or nesting bird species are observed and determined present within a project site during the pre-construction surveys or as required by the resource agencies, then a biological monitor shall be onsite to monitor throughout earth-moving activities that result in tree or vegetation removal, to minimize the likelihood of inadvertent impacts to protected biological resources. Monitoring shall also be conducted periodically during construction activities to ensure no new nests are built during any vegetation removal or building demolition activities between February 15 through September 15. The biological monitor shall ensure that all BMPs, avoidance, protection and mitigation measures described in the relevant project permits and reports are in place and are adhered to.

1. City of San Dimas

2. City of San Dimas
Project
Applicant
Field
Verification 3. Prior to the Start of
Project
Construction
The biological monitor shall have the authority to temporarily halt all construction activities and all non-emergency actions if protected biological resources are identified and would be directly affected. The monitor shall notify the project applicant, the City, and then the appropriate resource agency if the issue cannot be resolved. If necessary, the biological monitor shall relocate wildlife “out of harm’s way,” outside of the work area. Work can continue at the location if qualified biological monitor determines that the activity will not result in adverse effects on the protected resource.

The appropriate agencies shall be notified if a dead or injured protected species is located within a project site. Written notification shall be made within 15 days of 7145/San Dimas MCTA 20-0005 Page 7-15
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the date and time of the finding or incident (if known) and must include location of the carcass, a photograph, cause of death (if known), and other pertinent information.

MM BIO-15: Wildlife Entrapment Avoidance
Project-related excavations shall be secured to prevent wildlife entry and entrapment.
• Holes and trenches shall be backfilled, securely covered, or fenced. Excavations that cannot be fully secured shall incorporate appropriate wildlife ramp(s) at a slope of no more than a 3:1 ratio (horizontal: vertical), or other means to allow trapped animals to escape.

1. City of San Dimas

2. City of San Dimas •
•
•
Biological monitors shall provide guidance to construction crews to ensure that wildlife ramps or other means are sufficient to allow trapped animals to escape. Project Applicant
Field
Verification 3. Prior to the Start of
Project At the end of each work day, a biological monitor shall ensure that excavations have been secured or provided with appropriate means for wildlife escape. Construction All pipes or other construction materials or supplies will be covered or capped in storage or laydown areas. No pipes or tubing will be left open either temporarily or permanently, except during use or installation.

Any construction pipe, culvert, or other hollow materials will be inspected for wildlife before it is moved, buried, or capped. This type of inspection will be conducted to preclude or minimize potential impacts to all targeted species.

MM BIO-16: Construction Best Management Practices

1. City of San Dimas
Project work crews will be directed to use BMPs where applicable. These measures 2. City of San Dimas will be identified prior to construction and incorporated into the construction operations.

Project
Applicant
Field
Verification 3. Prior to the Start of
Project
Construction Implementation of this mitigation measure will help to avoid, eliminate or reduce impacts to sensitive biological resources, such as special-status terrestrial wildlife 7145/San Dimas MCTA 20-0005 Page 7-16
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species, to less than significant levels. BMPs that apply to this project construction and development are as follows:
• Water pollution and erosion control plans shall be developed and implemented in accordance with Los Angeles Regional Water Quality Control Board (RWQCB) requirements (i.e., National Pollutant Discharge Elimination System [NPDES], § 401 Clean Water Act [CWA],], and/or SWRCB Resolution No. 2019- 0015 [Waste Discharge Requirements]).]).
• Equipment storage, fueling, and staging areas shall be located on upland sites with minimal risks of direct drainage into riparian areas or another sensitive habitat. These designated areas shall be located in such a manner as to prevent any runoff from entering sensitive habitat. Necessary precautions shall be taken to prevent the release of cement or other toxic substances into surface waters. Project related spills of hazardous materials shall be reported to appropriate entities including but not limited to applicable jurisdictional areas per the City, USFWS, CDFG and RWQCB, and shall be cleaned up immediately and contaminated soils removed to approved disposal areas.

The natural resource agencies shall have the right to access and inspect any sites of approved projects including any restoration/enhancement area for compliance with project approval conditions including these BMPs.

Threshold 4.4b) Would
the project have a
See MM BIO-1 through MM BIO-3 above.
substantial adverse impact
on any riparian habitat or
other sensitive natural
community identified in
local or regional plans,
policies, regulations or by
the California Department of
Fish and Wildlife or U.S. Fish
and Wildlife Service?
See MM BIO-1
through MM
BIO-3 above.

See MM BIO-1
through MM
BIO-3 above.

See MM BIO-1 through MM
BIO-3 above.
7145/San Dimas MCTA 20-0005
Initial Study/Mitigated Negative Declaration

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Threshold 4.4c) Would MM BIO-17: Jurisdictional Delineation Survey and Report the project have a
substantial adverse effect on Applicants of grading permits pursuant to the proposed MCTA would be required state or federally protected
to contract with an authorized biologist to conduct a jurisdictional delineation wetlands (including, but not assessment on their property to determine the presence and extent of potential limited to, marsh, vernal pool, coastal, etc.) through
direct removal, filling,
hydrological interruption, or
other means?
waters of the U.S. or State (including but not limited to wetlands, ephemeral and intermittent drainages, and associated vegetation communities) that would be subject to the jurisdictional authority of the United States Army Corps of Engineers (USACE), the California State Water Resources Control Board (SWRCB, as represented by the Los Angeles RWQCB), and CDFW. If the assessment determines that the subject property may contain waters of the U.S. or State, a jurisdictional delineation survey is required.

1. City of San Dimas

2. City of San Dimas
Project
Applicant
Field
Verification 3. Prior to the Start of
Project Upon completion of the survey, waters of the U.S or State, if present on the applicant’s property, would be mapped and described in a jurisdictional delineation report that meets or exceeds the report standards of the USACE, Los Angeles District office. The report would include a determination of potential impacts to waters of the U.S. or State (including associated vegetation communities) that would result from the applicant’s project, quantify the area (in acres and square feet) of impacts to waters under the jurisdiction of each agency, and provide a list of permits, authorizations, and agreements required by the applicant from each agency. The report would also recommend impact avoidance and/or minimization measures and best management practices, and compensatory mitigation, as applicable.

Construction
Threshold 4.4d) Would
the project interfere
See MMs BIO-1, BIO-2, BIO-3, BIO-11, and BIO-16 above.
substantially with the
movement of any resident
or migratory fish or wildlife
species or with established
resident or migratory
wildlife corridors, or impede
the use of wildlife nursery
sites?
See MMs BIO-1,
BIO-2, BIO-3,
BIO-11, and BIO- 3, BIO-11, and
See MMs BIO1, BIO-2, BIO- See MMs BIO-1, BIO-2, BIO-3, BIO-11, and BIO-16 above.
16 above. BIO-16 above.

Threshold 4.4e) Would
the project conflict with any
See MM BIO-1 above. See MM BIO-1
above.

See MM BIO-1
above.

See MM BIO-1 above.
7145/San Dimas MCTA 20-0005
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local policies or ordinances
protecting biological
resources, such as a tree
preservation policy or
ordinance?
BIO-18: Mature Significant Tree Protection Measures
There are numerous trees in the project areas that are designated as “mature significant trees” as per the City’s tree preservation ordinance. Refer to Section 3.3.2 of the BRE (Appendix C) for an expanded discussion of the tree ordinance.

Prior to the issuance of a grading permit, in accordance with the tree preservation ordinance, a certified arborist will conduct a complete tree inventory of the project site and adjacent areas within the property of the applicant, including conservation easements. The tree inventory will include the location, species, estimated height, canopy dripline (estimate if inaccessible), health, and diameter(s) (see measurement requirements below). Transplantable saplings will also be noted.

Measurements. The trunk diameter must be measured at a point thirty-six inches above the ground at the base of the tree. Mature significant trees include:

1. City of San Dimas

2. City of San Dimas
•
•
•
Any tree of the Genus Quercus (oak) measuring greater than eight inches or more in trunk diameter, and/or Project
Applicant
Field
Verification 4. Prior to the Start of
Any other species of tree that measures ten inches or more in trunk diameter, Project and/or Construction
Any multi-trunk tree(s) having a total circumference of thirty-eight inches or more; the multi-trunk tree shall include at least one trunk with a diameter of a minimum of four inches.

The ordinance also requires that no significant trees shall be removed or relocated on an undeveloped area of a property without first submitting an arborist report and obtaining a tree removal permit from the City’s Development Services, Planning Division.

The arborist report will incorporate the aforementioned tree inventory criteria, as well as provisions for disease management using best available management practices including: (1) treated infected trees before removing them from the project site; (2) cleaning and disinfecting all pruning and power tools before and after use to prevent the introduction and/or spread of pathogens; (3) and irrigation avoidance within oak tree canopies. Recommendations for onsite and/or offsite 7145/San Dimas MCTA 20-0005
Initial Study/Mitigated Negative Declaration

❖ SECTION 7.0 – MITIGATION MONITORING AND REPORTING PROGRAM ❖ replanting methods will be provided. It is suggested that the City require replanting efforts to mimic the surrounding landscape and avoid separate landscape tree plantings as replacement, which do not meet the definition of CEQA for appropriate mitigation to less than a significant level.

Section 18.162.060 Conditions Imposed of the Tree Preservation Ordinance:
• Tree relocation and/or two for one replacement with minimum fifteen-gallon box tree(s), or other replacement of equivalent value and size, within the subject property. The two for one replacement ratio may be reduced as determined by the final decision-making body, if a minimum of one of the following additional findings are made: (1) The reduced replacement requirement is consistent with the purposes of this chapter, (2) the tree(s) in question are located where the impact of the tree removal on the community is limited (such as trees in a generally flat portion of the rear yard of a singlefamily house that are deemed to have less public benefit).; •
•
When on-site features, project constraints, and/or other considerations exist which prevent reasonable on-site relocation, relocation to an approved off-site location shall be permitted;
If said conditions are imposed, the owner will be responsible for all replacement and relocated trees for a minimum period of two years. If during this time the tree(s) is (are) declared unhealthy by a certified arborist as set forth in Section 18.162.090, the diseased trees shall be removed and replaced at the cost of the applicant, as set forth in Section 18.162.100 • A maintenance agreement shall be submitted by the applicant and established for each replaced and relocated tree. The maintenance agreement and maintenance responsibility shall be transferred with the sale of the property if title to the property is transferred within the specified maintenance period. (Ord. 1165 § 4, 2006))
If approved by the City, compensatory mitigation may occur through a fee payment into a local mitigation bank and/or through development and implementation of an HMMP (see BIO-1).

Replanting may occur onsite or offsite (within the reserved open space conservation easement) as “restoration/rehabilitation” and/or “enhancement.”.” The conservation easement must allow for habitat restoration activities if available as an option. The replacement plantings will be planted to mimic the surrounding natural habitat in an effort to retain the functions and values per each treedominated vegetation community. Individual disjointed plantings will be avoided to 7145/San Dimas MCTA 20-0005
Initial Study/Mitigated Negative Declaration

❖ SECTION 7.0 – MITIGATION MONITORING AND REPORTING PROGRAM ❖

1. ENFORCEMENT AGENCY RESPONSIBLE/

MONITORING
PARTY

TOPICAL AREA
IMPACT

MONITORING
ACTION MITIGATION MEASURE 2. MONITORING AGENCY

3. MONITORING PHASE
the maximum extent feasible, in an effort to maintain or prevent net loss of the existing surrounding landscape.

Upon City approval, BIO-1 may fully mitigate for BIO-18, This mitigation will satisfy the City’s Tree Preservation and Protection ordinance (Municipal Code Chapter 106.39) and will ensure equal or superior ecological viability as required in the FEIR, General Plan, and as per CEQA § 21081.6 Findings or Negative Declarations; Reporting or Monitoring Project Changes; Effect on Environment; Conditions.

4.5 Cultural Resources
Threshold 4.5a) Would
the project cause a
substantial adverse change
in the significance of a
MM CUL-1
Prior to the commencement of grading or excavation, workers conducting construction activities and their foremen will receive Worker Environmental Awareness Program (WEAP) training from a qualified archaeologist regarding the historical resource pursuant potential for sensitive archaeological and paleontological resources to be unearthed to § 15064.5? during grading activities. The workers will be directed to report any unusual specimens of bone, stone, ceramics or other archaeological artifacts or features observed during grading and/or other construction activities to their foremen and to cease grading activities in the immediate vicinity of the discovery until a qualified archaeologist or Native American cultural monitor is notified of the discovery by the Superintendent of the project site and can assess their significance. The WEAP shall be implemented to educate all construction personnel of the area’s environmental conditions and the environmental protection measures that must be adhered to by all workers throughout the duration of project construction.

1. City of San Dimas

2. City of San Dimas Project Field
Applicant Verification 3. Prior to Project
Construction
Training materials shall be language-appropriate for all construction personnel.

Upon completion of the WEAP, workers shall sign a form stating that they attended the program, understand all protection measures, and shall abide by all the rules of the WEAP. A record of all trained personnel shall be kept with the construction foreman at the project field construction office and shall be made available to any resource agency personnel. If new construction personnel are added to the project later, the construction foreman shall ensure that new personnel receive training before they start working. The archaeologist shall provide hard copies of the WEAP presentation to the construction foreman.

MM CUL-2 1. City of San Dimas

2. City of San Dimas
If historical or unique archaeological resources are discovered during construction, the contractor shall halt construction activities in the immediate area and notify the City. An on call qualified archaeologist shall be notified and afforded the necessary Project
Applicant
Field
Verification
7145/San Dimas MCTA 20-0005
Initial Study/Mitigated Negative Declaration

❖ SECTION 7.0 – MITIGATION MONITORING AND REPORTING PROGRAM ❖

1. ENFORCEMENT AGENCY RESPONSIBLE/

MONITORING
PARTY

TOPICAL AREA
IMPACT

MONITORING
ACTION MITIGATION MEASURE 2. MONITORING AGENCY

3. MONITORING PHASE
time to recover, analyze, and curate the find(s). A Monitoring and Treatment Plan shall be prepared by the qualified archaeologist. The qualified archaeologist shall recommend the extent of archaeological monitoring necessary to ensure the protection of any other resources that may be in the area and afforded the necessary time and funds to recover, analyze, and curate the find(s). Construction activities may continue on other parts of the site while evaluation and treatment of historical or unique archaeological resources takes place.

3. During Project
Construction
Threshold 4.5b) Would the Refer to mitigation measures CUL-1 and CUL-2 above.

Refer to
mitigation
measures CUL-1
and CUL-2
above.

Refer to
mitigation
measures
CUL-1 and
CUL-2 above.
project cause a substantial
adverse change in the
significance of an
archaeological resource
pursuant to § 15064.5?
Refer to mitigation measures
CUL-1 and CUL-2 above.

Threshold 4.5c) Would the
project disturb any human
remains, including those
interred outside of formal
cemeteries?
MM CUL-3
If human remains are encountered during excavations associated with this project, all work shall stop within a 30-foot radius of the discovery and the County Coroner shall be notified (§ 5097.98 of the Public Resources Code). The Coroner shall determine whether the remains are recent human origin or older Native American ancestry. If the coroner, with the aid of the supervising archaeologist, determines that the remains are prehistoric, they shall contact the NAHC. The NAHC shall be responsible for designating the Most Likely Descendant (MLD). The MLD (either an individual or sometimes a committee) shall be responsible for the ultimate disposition of the remains, as required by § 7050.5 of the California Health and Safety Code. The MLD shall make recommendations within 24 hours of their notification by the NAHC. These recommendations may include scientific removal and nondestructive analysis of human remains and items associated with Native American burials (§ 7050.5 of the Health and Safety Code).

1. City of San Dimas

2. City of San Dimas Project
Applicant
Field
Verification 3. During Project
Construction

4.7 Geology and Soils
Threshold 4.7f) Project
could directly or indirectly
destroy a unique
paleontological resource or
site or unique geologic
feature.

MM GEO-1
Before the beginning of grading pursuant to the proposed project, the grading proponent shall retain a qualified paleontologist to be on-call during the duration of grading. If paleontological resources are uncovered during grading, the contractor shall halt grading in the immediate area and notify the City. The on-call paleontologist shall be notified and afforded the necessary time and funds to recover, analyze, and curate the find(s). Subsequently, the monitor shall remain onsite for the duration of grading to ensure the protection of any other resources that are found.

1. City of San Dimas

2. City of San Dimas Project
Applicant
Field
Verification 3. During Project
Construction
7145/San Dimas MCTA 20-0005
Initial Study/Mitigated Negative Declaration

❖ SECTION 7.0 – MITIGATION MONITORING AND REPORTING PROGRAM ❖

1. ENFORCEMENT AGENCY RESPONSIBLE/

MONITORING
PARTY

TOPICAL AREA
IMPACT

MONITORING
ACTION MITIGATION MEASURE 2. MONITORING AGENCY

3. MONITORING PHASE

4.10 Hydrology and Water Quality
Threshold 4.10c) Would
the project substantially
alter the existing drainage
pattern of the site or area,
including through the
alteration of the course of a
stream or river or through
the addition of impervious
surfaces, in a manner which
would:

Refer to MM GEO-1 above.

Refer to MM
GEO-1 above.

Refer to MM
GEO-1 above.

Refer to MM GEO-1 above.
i) Result in substantial
erosion or siltation onor offsite;
Threshold 4.10c) MM HYD-1 Hydraulic Study.

1. City of San Dimas

2. City of San Dimas
ii) Substantially
increase the rate or
amount of surface
runoff in a manner
which would result in
flooding on- or offsite;
This mitigation measure would require applicants for grading permits pursuant to the proposed MCTA to prepare a hydraulic study. The hydraulic study would evaluate the ability of existing downstream infrastructure to safely collect and convey any additional runoff created by future projects into the existing storm drainage system in accordance with San Dimas and LA County standards. The hydraulic study must be approved by the City Engineer and would be required prior to review and approval of grading plans by the Building Official and City Engineer.

Refer to MM HYD-1 above.

Project
Applicant
City Engineer
Plan Review 3. Prior to project
grading plan
approval
Threshold 4.10c)
iii) Create or contribute
runoff water which
would exceed the
capacity of existing or
planned stormwater
drainage systems or
provide substantial
additional sources of
polluted runoff;
Refer to MM
HYD-1 above.

Refer to MM
HYD-1 above.

Refer to MM HYD-1 above.
7145/San Dimas MCTA 20-0005
Initial Study/Mitigated Negative Declaration

❖ APPENDICES ❖

APPENDICES

❖ APPENDICES ❖

APPENDIX A
PLANNING AREA 1 LOT COVERAGES

Table 1: SP-11, Planning Area 1 Lot Coverage Calculations Available 1st
Max. Lot Coverage Floor Building Estimated Grading Based on 1st (35%) Area (Sq Ft) Floor Bldg Area (CY)
27,362
1st Floor Built Area
(Sq Ft)
7,350
N/A
Lot No.
1 Address APN Lot Size (Sq Ft)
99,178
Lot Coverage %

7.41%
N/A
1508 Calle Cristina
1514 Calle Cristina
1520 Calle Cristina
1526 Calle Cristina
1532 Calle Cristina
1538 Calle Cristina
1544 Calle Cristina
1550 Calle Cristina
1556 Calle Cristina
1562 Calle Cristina
1568 Calle Cristina
1574 Calle Cristina
1580 Calle Cristina
2050 Paseo Lucinda 8448-038-043
2062 Paseo Lucinda 8448-038-044
2068 Paseo Lucinda 8448-008-042
2069 Paseo Lucinda 8448-008-043
2063 Paseo Lucinda 8448-008-044
2057 Paseo Lucinda 8448-038-045
1602 Calle Cristina
1608 Calle Cristina
1614 Calle Cristina
1620 Calle Cristina
1615 Calle Cristina
1609 Calle Cristina
1603 Calle Cristina
1581 Calle Cristina
1575 Calle Cristina
1569 Calle Cristina
N/A Calle Cristina
N/A Calle Cristina
1551 Calle Cristina
N/A Calle Cristina
1539 Calle Cristina
1533 Calle Cristina
1527 Calle Cristina
8448-038-031
8448-038-032
8448-038-033
8448-038-034
8448-038-035
8448-038-036
8448-038-037
8448-038-038
8448-038-039
8448-038-040
8448-008-041
8448-038-041
8448-038-042
34,712
34,553
23,742
21,271
20,728
29,718
28,704
32,406
60,924
46,163
326,260
31,710
14,439
54,885
33,382
47,460
23,662
16,865
15,154
10,611
14,147
16,053
21,966
58,440
55,057
44,336
25,408
36,880
36,872
15,871
26,510
27,015
25,180
22,262
18,970
21,354
4,500
12,750
11,000
9,250
2 3
4 5
6 7
8 9
98,723
67,833
60,774
59,222
84,909
82,012
92,589
174,068
131,895
932,170
90,599
41,254
156,815
95,376
135,600
67,605
48,185
43,298
30,317
40,419
45,865
62,759
166,971
157,305
126,675
72,594
105,370
105,349
45,346
75,743
77,187
71,943
63,605
54,201
61,010
34,553
20,062
17,991
16,157
25,918
24,278
26,956
56,404
46,163
318,718
24,810
8,420
48,885
29,710
44,810
18,182
12,465
15,154
7,253
10,502
12,755
14,966
54,268
52,040
39,873
22,747
33,080
32,672
15,871
26,510
27,015
25,180
15,420
11,010
14,884
3,680
3,280
4,571
3,800
4,426
5,450
4,520
N/A
7542
6900
6019
6000
3672
2650
5480
4400
N/A
3358
3645
3298
7000
4172
3017
4463
2661
3800
4200
N/A

5.43%

5.40%

7.72%

4.48%

5.40%

5.89%

2.60%
N/A

0.81%

7.62%

14.59%

3.83%

3.85%

1.95%

8.11%

9.13%
N/A

11.08%

9.02%

7.19%

11.15%

2.50%

1.92%

3.52%

3.67%

3.61%

3.99%
N/A
5,900
14,500
13,500
21,500
25,000
60,000
200000+
15,000
1,000
18,000
18,000
49,000
7,500
3,200
16,500
2,400
3,250
3,500
10 11
12 13
14 15
16 17
18 19
20 21
22 23
24 25
26 27
28 29
30 31
32 33
34 35
36 8448-038-046
8448-038-047
8448-008-045
8448-008-046
8448-008-047
8448-008-048
8448-008-055
8448-038-048
8448-038-049
8448-038-050
8448-038-051
8448-038-052
8448-038-053
8448-038-054
8448-038-055
8448-038-056
8448-038-057
7,000
22,000
34,000
38,000
13,500
34,000
18,000
8,800
32,500
36,000
7,900
N/A
N/A
N/A
6842
7,960
6,470
N/A
N/A
N/A

10.76%

14.69%

10.60%
5,000
1,200
850
Average Lot
Size:

Average Lot
Coverage:

Average Available
109,021 6.5% Building Area: 34,251 Average Available Grading: 21,500 CY Total Available Grading: 774,000+ CY

❖ APPENDICES ❖

APPENDIX B

AIR QUALITY AND GREENHOUSE GAS EMISSSION DATA

CalEEMod Version: CalEEMod.2020.4.0 Page 1 of 18 Date: 8/12/2022 9:43 AM 7145_San Dimas MCTA 20-0005 - Los Angeles-South Coast County, Annual EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied 7145_San Dimas MCTA 20-0005
Los Angeles-South Coast County, Annual

1.0 Project Characteristics

1.1 Land Usage
Land Uses Size Metric Lot Acreage

90.10 Floor Surface Area
1,233,036.00
Population
Single Family Housing 36.00 Dwelling Unit 103

1.2 Other Project Characteristics
Urbanization
Climate Zone
Urban
9 Wind Speed (m/s) 2.2 Precipitation Freq (Days) 33
Operational Year 2024
Utility Company Southern California Edison
CO2 Intensity 390.98
(lb/MWhr)
CH4 Intensity
(lb/MWhr)

0.033 N2O Intensity
(lb/MWhr)

0.004

1.3 User Entered Comments & Non-Default Data
Project Characteristics -
Land Use - Average lot size = 109,021sq ft; 36 lots= 3,924,756sq ft= 90.1 acres Average available building area= 34,251sq feet; 36 lots= 1,233,036 sqft Construction Phase -
Off-road Equipment - only grading is considered
Off-road Equipment -
Trips and VMT - only grading is considered
On-road Fugitive Dust - only grading is considered
Demolition -
Grading - only grading is considered
Architectural Coating - only grading is considered
Woodstoves - Page 1209 – 2053
CalEEMod Version: CalEEMod.2020.4.0 Page 2 of 18 Date: 8/12/2022 9:43 AM 7145_San Dimas MCTA 20-0005 - Los Angeles-South Coast County, Annual EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Area Coating -
Construction Off-road Equipment Mitigation -
Table Name Column Name Default Value
0 New Value
tblConstDustMitigation 15
tblGrading
WaterUnpavedRoadVehicleSpeed
MaterialImported 0.00 36,000.00
1,233,036.00

90.10 tblLandUse LandUseSquareFeet
LotAcreage
64,800.00
tblLandUse 11.69

2.0 Emissions Summary

CalEEMod Version: CalEEMod.2020.4.0 Page 3 of 18 Date: 8/12/2022 9:43 AM 7145_San Dimas MCTA 20-0005 - Los Angeles-South Coast County, Annual EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied

2.1 Overall Construction
Unmitigated Construction
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Year tons/yr MT/yr
2023 0.2671 2.9883 2.3057 6.2800e0030.7710 0.1124 0.8834 0.2986 0.1034 0.4021 0.0000 567.5727 567.5727 0.1443 0.0212 577.4951 Maximum 0.2671 2.9883 2.3057 6.2800e0030.7710 0.1124 0.8834 0.2986 0.1034 0.4021 0.0000 567.5727 567.5727 0.1443 0.0212 577.4951 Mitigated Construction
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Year tons/yr MT/yr
2023 0.2671 2.9883 2.3057 6.2800e0030.3776 0.1124 0.4899 0.1427 0.1034 0.2461 0.0000 567.5722 567.5722 0.1443 0.0212 577.4945 Maximum 0.2671 2.9883 2.3057 6.2800e0030.3776 0.1124 0.4899 0.1427 0.1034 0.2461 0.0000 567.5722 567.5722 0.1443 0.0212 577.4945 ROG

0.00 NOx

0.00 CO SO2

0.00 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio-CO2 Total CO2 CH4

0.00 N20

0.00 CO2e
Percent 0.00 51.03 0.00 44.54 52.21 0.00 38.78 0.00 0.00 0.00 0.00 Reduction

CalEEMod Version: CalEEMod.2020.4.0 Page 4 of 18 Date: 8/12/2022 9:43 AM 7145_San Dimas MCTA 20-0005 - Los Angeles-South Coast County, Annual EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Quarter Start Date
1-1-2023
4-1-2023
7-1-2023
End Date
3-31-2023
6-30-2023
9-30-2023
Highest
Maximum Unmitigated ROG + NOX (tons/quarter) Maximum Mitigated ROG + NOX (tons/quarter) 1 2
3 1.3490

1.3584

0.5225

1.3584

1.3490

1.3584

0.5225

1.3584

2.2 Overall Operational
Unmitigated Operational
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category tons/yr MT/yr
Area
Energy
Mobile
Waste
Water
Total

4.9704 0.0136

0.0423

0.2052

0.6000

0.0180

1.8638

6.0000e0040.0364 0.0364 0.0364 0.0364 3.8239

0.0000

0.0000

8.5723

0.7441

13.1403

7.9546 11.7785

99.1413

0.0120 2.6000e00412.1555

99.6911
388.4549

21.2375

11.5655
533.1046

4.9500e0032.7000e0043.4200e0033.4200e0033.4200e0033.4200e00399.1413 5.1700e0031.4100e003

0.1783 4.0700e0030.4311 2.9900e0030.4341

0.0000

0.0000

0.4739

0.1150 2.7700e0030.1178

0.0000

0.0000

0.1576
382.9447 382.9447 0.0258

0.5066

0.0771

0.6267

0.0163

0.0000 0.0000

0.0000

0.0428

0.0000

0.0000

0.0426

0.0000

8.3299

8.5723

9.0740 1.8900e003

5.1537 0.2611 2.4818 4.9400e0030.4311 0.1150 498.3706 511.5109 0.0199

CalEEMod Version: CalEEMod.2020.4.0 Page 5 of 18 Date: 8/12/2022 9:43 AM 7145_San Dimas MCTA 20-0005 - Los Angeles-South Coast County, Annual EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied

2.2 Overall Operational
Mitigated Operational
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category tons/yr MT/yr
Area
Energy
Mobile
Waste
Water
Total

4.9704 0.0136

0.0423

0.2052

0.6000

0.0180

1.8638

6.0000e0040.0364 0.0364 0.0364 0.0364 3.8239

0.0000

0.0000

8.5723

0.7441

13.1403

7.9546 11.7785

99.1413

0.0120 2.6000e00412.1555

99.6911
388.4549

21.2375

11.5655
533.1046

4.9500e0032.7000e0043.4200e0033.4200e0033.4200e0033.4200e00399.1413 5.1700e0031.4100e003

0.1783 4.0700e0030.4311 2.9900e0030.4341

0.0000

0.0000

0.4739

0.1150 2.7700e0030.1178

0.0000

0.0000

0.1576
382.9447 382.9447 0.0258

0.5066

0.0771

0.6267

0.0163

0.0000 0.0000

0.0000

0.0428

0.0000

0.0000

0.0426

0.0000

8.3299

8.5723

9.0740 1.8900e003

5.1537 0.2611 2.4818 4.9400e0030.4311 0.1150 498.3706 511.5109 0.0199 ROG NOx

0.00 CO SO2

0.00 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio-CO2 Total CO2 CH4

0.00 N20 CO2e
Percent 0.00
Reduction

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

3.0 Construction Detail
Construction Phase
Phase
Number
Phase Name Phase Type Start Date End Date Num Days Num Days Week
Phase Description
1 Grading Grading 1/1/2023 8/4/2023 5 155
Acres of Grading (Site Preparation Phase): 0 Page 1213 – 2053 CalEEMod Version: CalEEMod.2020.4.0 Page 6 of 18 Date: 8/12/2022 9:43 AM 7145_San Dimas MCTA 20-0005 - Los Angeles-South Coast County, Annual EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Acres of Grading (Grading Phase): 465
Acres of Paving: 0
Residential Indoor: 0; Residential Outdoor: 0; Non-Residential Indoor: 0; Non-Residential Outdoor: 0; Striped Parking Area: 0 (Architectural Coating – sqft)
OffRoad Equipment
Phase Name Offroad Equipment Type
Excavators
Amount Usage Hours

8.00 Horse Power
158
Load Factor
Grading 0.38
Grading
Grading
Grading
Grading
2 1
1 2
2 Graders 8.00

8.00 8.00

8.00 187
247
367
97 0.41

0.40 0.48

0.37 Rubber Tired Dozers
Scrapers
Tractors/Loaders/Backhoes
Trips and VMT
Phase Name Offroad Equipment
Count
Worker Trip
Number
Vendor Trip Hauling Trip Worker Trip Vendor Trip Hauling Trip Worker Vehicle Class
Vendor
Vehicle Class Vehicle Class
Hauling
Number Number Length Length Length
Grading 8 20.00 0.00 4,500.00 14.70 6.90 20.00 LD_Mix HDT_Mix HHDT

3.1 Mitigation Measures Construction
Water Exposed Area
Reduce Vehicle Speed on Unpaved Roads

CalEEMod Version: CalEEMod.2020.4.0 Page 7 of 18 Date: 8/12/2022 9:43 AM 7145_San Dimas MCTA 20-0005 - Los Angeles-South Coast County, Annual EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied

3.2 Grading - 2023
Unmitigated Construction On-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category tons/yr MT/yr
Fugitive Dust
Off-Road
Total

0.7153 0.0000

0.1104

0.1104

0.7153

0.1104

0.8257

0.2835 0.0000

0.1016

0.1016

0.2835

0.1016

0.3850

0.0000

0.0000

0.0000

0.0000 0.0000 0.0000

0.1367

0.1367

0.0000

0.0000

0.0000

0.0000

0.2574 2.6750 2.1740 4.8100e003422.6479 422.6479 426.0652

0.2574 2.6750 2.1740 4.8100e- 426.0652
003

0.7153 0.2835 422.6479 422.6479
Unmitigated Construction Off-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category tons/yr MT/yr
Hauling
Vendor
Worker
Total

4.7500e0030.3094

0.0000

0.0788

0.0000

0.0530

0.1317

1.3200e0030.0387

0.0000

0.0170

0.0557

1.8500e0030.0406

0.0000

0.0171

0.0577

0.0106

0.0000

1.7700e0030.0124

0.0000

0.0000

0.0000

0.0000

0.0000
131.2356 131.2356 7.2200e0030.0208

0.0000
137.6268

0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000

4.9200e0033.9100e0031.5000e0041.0000e0044.5100e0031.0000e0044.6100e00313.6892 13.6892 3.6000e0043.5000e00413.8031

9.6700e- 151.4299
003

0.3133 1.4700e0031.9500e0030.0151 1.8700e0030.0170 144.9248 144.9248 7.5800e0030.0212

CalEEMod Version: CalEEMod.2020.4.0 Page 8 of 18 Date: 8/12/2022 9:43 AM 7145_San Dimas MCTA 20-0005 - Los Angeles-South Coast County, Annual EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied

3.2 Grading - 2023
Mitigated Construction On-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category tons/yr MT/yr
Fugitive Dust
Off-Road
Total

0.3219 0.0000

0.1104

0.1104

0.3219

0.1104

0.4323

0.1276 0.0000

0.1016

0.1016

0.1276

0.1016

0.2291

0.0000

0.0000

0.0000

0.0000 0.0000 0.0000

0.1367

0.1367

0.0000

0.0000

0.0000

0.0000

0.2574 2.6750 2.1740 4.8100e003422.6474 422.6474 426.0647

0.2574 2.6750 2.1740 4.8100e- 426.0647
003

0.3219 0.1276 422.6474 422.6474
Mitigated Construction Off-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category tons/yr MT/yr
Hauling
Vendor
Worker
Total

4.7500e0030.3094

0.0000

0.0788

0.0000

0.0530

0.1317

1.3200e0030.0387

0.0000

0.0170

0.0557

1.8500e0030.0406

0.0000

0.0171

0.0577

0.0106

0.0000

1.7700e0030.0124

0.0000

0.0000

0.0000

0.0000

0.0000
131.2356 131.2356 7.2200e0030.0208

0.0000
137.6268

0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000

4.9200e0033.9100e0031.5000e0041.0000e0044.5100e0031.0000e0044.6100e00313.6892 13.6892 3.6000e0043.5000e00413.8031

9.6700e- 151.4299
003

0.3133 1.4700e0031.9500e0030.0151 1.8700e0030.0170 144.9248 144.9248 7.5800e0030.0212

CalEEMod Version: CalEEMod.2020.4.0 Page 9 of 18 Date: 8/12/2022 9:43 AM 7145_San Dimas MCTA 20-0005 - Los Angeles-South Coast County, Annual EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied

4.0 Operational Detail - Mobile

4.1 Mitigation Measures Mobile
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category tons/yr MT/yr
Mitigated 0.1783

0.1783

0.2052

0.2052

1.8638

1.8638

4.0700e0030.4311

0.4311

2.9900e0030.4341

0.4341

0.1150

0.1150

2.7700e0030.1178

0.1178

0.0000

0.0000
382.9447 382.9447 0.0258

0.0258

0.0163

0.0163
388.4549
Unmitigated 4.0700e- 388.4549
003

2.9900e0032.7700e003382.9447 382.9447

4.2 Trip Summary Information
Average Daily Trip Rate Unmitigated Mitigated
Land Use Weekday Saturday Sunday Annual VMT Annual VMT
Single Family Housing
Total
339.84
339.84
343.44
343.44
307.80
307.80
1,147,402
1,147,402
1,147,402
1,147,402

4.3 Trip Type Information
Miles Trip % Trip Purpose %
Land Use H-W or C-W H-S or C-C H-O or C-NW H-W or C-W H-S or C-C H-O or C-NW Primary 86 Diverted
11 Pass-by
Single Family Housing 14.70 5.90 8.70 40.20 19.20 40.60 3

4.4 Fleet Mix
Land Use LDA LDT1 LDT2

0.188241
MDV

0.126899
LHD1

0.023249
LHD2

0.006239

MHD HHD OBUS UBUS MCY SBUS MH
Single Family Housing 0.542464 0.063735 0.010717 0.008079 0.000923 Page 1217 – 2053 0.000604 0.024795 0.000702 0.003352 CalEEMod Version: CalEEMod.2020.4.0 Page 10 of 18 Date: 8/12/2022 9:43 AM 7145_San Dimas MCTA 20-0005 - Los Angeles-South Coast County, Annual EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied

5.0 Energy Detail
Historical Energy Use: N

5.1 Mitigation Measures Energy
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category tons/yr MT/yr
Electricity
Mitigated

0.0000

0.0000

0.0000

0.0000

0.0000

0.0000

0.0000

0.0000

0.0000

0.0000

0.0000

0.0000

50.1685

50.1685

48.9728

48.9728

50.1685

50.1685

48.9728

48.9728

4.2300e0035.1000e00450.4274

50.4274

49.2638

49.2638
Electricity
Unmitigated

4.2300e0035.1000e004
NaturalGas
Mitigated

4.9500e0030.0423

0.0423

0.0180

0.0180

2.7000e0043.4200e0033.4200e0033.4200e0033.4200e0039.4000e0049.0000e004 NaturalGas
Unmitigated

4.9500e0032.7000e0043.4200e0033.4200e0033.4200e0033.4200e0039.4000e0049.0000e004

CalEEMod Version: CalEEMod.2020.4.0 Page 11 of 18 Date: 8/12/2022 9:43 AM 7145_San Dimas MCTA 20-0005 - Los Angeles-South Coast County, Annual EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied

5.2 Energy by Land Use - NaturalGas
Unmitigated
NaturalGa
s Use
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Land Use kBTU/yr
917715
tons/yr MT/yr
Single Family
Housing

4.9500e0030.0423 0.0180 2.7000e0043.4200e0033.4200e0033.4200e0033.4200e0030.0000 48.9728 48.9728 9.4000e0049.0000e00449.2638 Total 4.9500e0030.0423 0.0180 2.7000e0043.4200e0033.4200e0033.4200e0033.4200e0030.0000 48.9728 48.9728 9.4000e0049.0000e00449.2638 Mitigated
NaturalGa
s Use
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Land Use kBTU/yr
917715
tons/yr MT/yr
Single Family
Housing

4.9500e0030.0423 0.0180 2.7000e0043.4200e0033.4200e0033.4200e0033.4200e0030.0000 48.9728 48.9728 9.4000e0049.0000e00449.2638 Total 4.9500e0030.0423 0.0180 2.7000e0043.4200e0033.4200e0033.4200e0033.4200e0030.0000 48.9728 48.9728 9.4000e0049.0000e00449.2638

CalEEMod Version: CalEEMod.2020.4.0 Page 12 of 18 Date: 8/12/2022 9:43 AM 7145_San Dimas MCTA 20-0005 - Los Angeles-South Coast County, Annual EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied

5.3 Energy by Land Use - Electricity
Unmitigated
Electricity Total CO2
Use
CH4 N2O CO2e
Land Use kWh/yr MT/yr
Single Family
Housing
282886 50.1685 4.2300e0035.1000e00450.4274
Total 50.1685 4.2300e0035.1000e00450.4274
Mitigated
Electricity Total CO2
Use
CH4 N2O CO2e
Land Use kWh/yr MT/yr
Single Family
Housing
282886 50.1685 4.2300e0035.1000e00450.4274
Total 50.1685 4.2300e0035.1000e00450.4274

6.0 Area Detail

6.1 Mitigation Measures Area

CalEEMod Version: CalEEMod.2020.4.0 Page 13 of 18 Date: 8/12/2022 9:43 AM 7145_San Dimas MCTA 20-0005 - Los Angeles-South Coast County, Annual EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category tons/yr MT/yr
Mitigated 4.9704

4.9704

0.0136

0.0136

0.6000

0.6000

6.0000e0040.0364

0.0364

0.0364

0.0364

0.0364

0.0364

0.0364

0.0364

3.8239

3.8239

7.9546

7.9546

11.7785 0.0120

0.0120

2.6000e00412.1555
Unmitigated 6.0000e- 12.1555
004

11.7785 2.6000e004

6.2 Area by SubCategory
Unmitigated
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
SubCategory tons/yr MT/yr
Architectural
Coating

0.3858

4.4556

0.1179

0.0112

4.9704

0.0000

0.0000

0.0344

0.0000

0.0000

0.0344

0.0000

0.0000

0.0344

0.0000

0.0000

0.0344

0.0000

0.0000

3.8239

0.0000

3.8239

0.0000

0.0000

7.3482

0.6064

7.9546

0.0000

0.0000

0.0000

0.0000

0.0114

0.0000

0.0000

0.0000

0.0000

11.5345

0.6210

12.1555
Consumer
Products
Hearth
Landscaping
Total

9.3400e0030.2289

0.3711

0.6000

5.8000e00411.1721

0.6064

2.6000e004

4.2800e0032.0000e0052.0600e0032.0600e0032.0600e0032.0600e0035.8000e0040.0000

0.0136 6.0000e0040.0364 0.0364 0.0364 0.0364 11.7785 0.0120 2.6000e004

CalEEMod Version: CalEEMod.2020.4.0 Page 14 of 18 Date: 8/12/2022 9:43 AM 7145_San Dimas MCTA 20-0005 - Los Angeles-South Coast County, Annual EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied

6.2 Area by SubCategory
Mitigated
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
SubCategory tons/yr MT/yr
Architectural
Coating

0.3858

4.4556

0.1179

0.0112

4.9704

0.0000

0.0000

0.0344

0.0000

0.0000

0.0344

0.0000

0.0000

0.0344

0.0000

0.0000

0.0344

0.0000

0.0000

3.8239

0.0000

3.8239

0.0000

0.0000

7.3482

0.6064

7.9546

0.0000

0.0000

0.0000

0.0000

0.0114

0.0000

0.0000

0.0000

0.0000

11.5345

0.6210

12.1555
Consumer
Products
Hearth
Landscaping
Total

9.3400e0030.2289

0.3711

0.6000

5.8000e00411.1721

0.6064

2.6000e004

4.2800e0032.0000e0052.0600e0032.0600e0032.0600e0032.0600e0035.8000e0040.0000

0.0136 6.0000e0040.0364 0.0364 0.0364 0.0364 11.7785 0.0120 2.6000e004

7.0 Water Detail

7.1 Mitigation Measures Water

CalEEMod Version: CalEEMod.2020.4.0 Page 15 of 18 Date: 8/12/2022 9:43 AM 7145_San Dimas MCTA 20-0005 - Los Angeles-South Coast County, Annual EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Total CO2 CH4 N2O CO2e
Category MT/yr
Mitigated 9.0740

9.0740

0.0771

0.0771

1.8900e00311.5655
Unmitigated 1.8900e- 11.5655
003

7.2 Water by Land Use
Unmitigated
Indoor/Out Total CO2
door Use
CH4 N2O CO2e
Land Use Mgal MT/yr
Single Family
Housing

2.34554 /

1.47871

9.0740 0.0771 1.8900e00311.5655
Total 9.0740 0.0771 1.8900e00311.5655

CalEEMod Version: CalEEMod.2020.4.0 Page 16 of 18 Date: 8/12/2022 9:43 AM 7145_San Dimas MCTA 20-0005 - Los Angeles-South Coast County, Annual EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied

7.2 Water by Land Use
Mitigated
Indoor/Out Total CO2
door Use
CH4 N2O CO2e
Land Use Mgal MT/yr
Single Family
Housing

2.34554 /

1.47871

9.0740 0.0771 1.8900e00311.5655
Total 9.0740 0.0771 1.8900e00311.5655

8.0 Waste Detail

8.1 Mitigation Measures Waste
Category/Year
Total CO2 CH4 N2O CO2e
MT/yr
Mitigated 8.5723

8.5723

0.5066

0.5066

0.0000

0.0000

21.2375
Unmitigated 21.2375

CalEEMod Version: CalEEMod.2020.4.0 Page 17 of 18 Date: 8/12/2022 9:43 AM 7145_San Dimas MCTA 20-0005 - Los Angeles-South Coast County, Annual EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied

8.2 Waste by Land Use
Unmitigated
Waste Total CO2 CH4 N2O CO2e
Disposed
Land Use tons MT/yr
Single Family
Housing

42.23 8.5723 0.5066 0.0000 21.2375
Total 8.5723 0.5066 0.0000 21.2375
Mitigated
Waste Total CO2 CH4 N2O CO2e
Disposed
Land Use tons MT/yr
Single Family
Housing

42.23 8.5723 0.5066 0.0000 21.2375
Total 8.5723 0.5066 0.0000 21.2375

9.0 Operational Offroad
Equipment Type Number Hours/Day Days/Year Horse Power Load Factor Fuel Type Page 1225 – 2053 CalEEMod Version: CalEEMod.2020.4.0 Page 18 of 18 Date: 8/12/2022 9:43 AM 7145_San Dimas MCTA 20-0005 - Los Angeles-South Coast County, Annual EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied

10.0 Stationary Equipment
Fire Pumps and Emergency Generators
Equipment Type Number Hours/Day Hours/Year Horse Power
Boiler Rating
Load Factor
Fuel Type
Fuel Type
Boilers
Equipment Type Number
Number
Heat Input/Day Heat Input/Year
User Defined Equipment
Equipment Type

11.0 Vegetation

CalEEMod Version: CalEEMod.2020.4.0 Page 1 of 14 Date: 8/12/2022 9:46 AM 7145_San Dimas MCTA 20-0005 - Los Angeles-South Coast County, Summer EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied 7145_San Dimas MCTA 20-0005
Los Angeles-South Coast County, Summer

1.0 Project Characteristics

1.1 Land Usage
Land Uses Size Metric Lot Acreage

90.10 Floor Surface Area
1,233,036.00
Population
Single Family Housing 36.00 Dwelling Unit 103

1.2 Other Project Characteristics
Urbanization
Climate Zone
Urban
9 Wind Speed (m/s) 2.2 Precipitation Freq (Days) 33
Operational Year 2024
Utility Company Southern California Edison
CO2 Intensity 390.98
(lb/MWhr)
CH4 Intensity
(lb/MWhr)

0.033 N2O Intensity
(lb/MWhr)

0.004

1.3 User Entered Comments & Non-Default Data
Project Characteristics -
Land Use - Average lot size = 109,021sq ft; 36 lots= 3,924,756sq ft= 90.1 acres Average available building area= 34,251sq feet; 36 lots= 1,233,036 sqft Construction Phase -
Off-road Equipment - only grading is considered
Off-road Equipment -
Trips and VMT - only grading is considered
On-road Fugitive Dust - only grading is considered
Demolition -
Grading - only grading is considered
Architectural Coating - only grading is considered
Woodstoves - Page 1227 – 2053
CalEEMod Version: CalEEMod.2020.4.0 Page 2 of 14 Date: 8/12/2022 9:46 AM 7145_San Dimas MCTA 20-0005 - Los Angeles-South Coast County, Summer EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Area Coating -
Construction Off-road Equipment Mitigation -
Table Name Column Name Default Value
0 New Value
tblConstDustMitigation 15
tblGrading
WaterUnpavedRoadVehicleSpeed
MaterialImported 0.00 36,000.00
1,233,036.00

90.10 tblLandUse LandUseSquareFeet
LotAcreage
64,800.00
tblLandUse 11.69

2.0 Emissions Summary

CalEEMod Version: CalEEMod.2020.4.0 Page 3 of 14 Date: 8/12/2022 9:46 AM 7145_San Dimas MCTA 20-0005 - Los Angeles-South Coast County, Summer EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied

2.1 Overall Construction (Maximum Daily Emission)
Unmitigated Construction
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Year lb/day lb/day
2023 3.4487 38.3487 29.7871 0.0811 9.9616 1.4497 11.4113 3.8564 1.3346 5.1910 0.0000 8,079.787 8,079.787 2.0521 0.3009 8,220.758 7 7 5
Maximum 3.4487 38.3487 29.7871 0.0811 9.9616 1.4497 11.4113 3.8564 1.3346 5.1910 0.0000 8,079.787 8,079.787 2.0521 0.3009 8,220.758 7 7 5
Mitigated Construction
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Year lb/day lb/day
2023 3.4487 38.3487 29.7871 0.0811 4.8852 1.4497 6.3349 1.8446 1.3346 3.1792 0.0000 8,079.787 8,079.787 2.0521 0.3009 8,220.758 7 7 5
Maximum 3.4487 38.3487 29.7871 0.0811 4.8852 1.4497 6.3349 1.8446 1.3346 3.1792 0.0000 8,079.787 8,079.787 2.0521 0.3009 8,220.758 7 7 5
ROG

0.00 NOx

0.00 CO SO2

0.00 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio-CO2 Total CO2 CH4

0.00 N20

0.00 CO2e
Percent 0.00 50.96 0.00 44.49 52.17 0.00 38.75 0.00 0.00 0.00 0.00 Reduction

CalEEMod Version: CalEEMod.2020.4.0 Page 4 of 14 Date: 8/12/2022 9:46 AM 7145_San Dimas MCTA 20-0005 - Los Angeles-South Coast County, Summer EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied

2.2 Overall Operational
Unmitigated Operational
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Area
Energy
Mobile
Total

36.0505

0.0271

1.0368

37.1144

0.7812

0.2317

1.0529

2.0658

21.2767

0.0986

0.0469 2.7664

0.0187

0.0168

2.8020

2.7664

0.0187

2.4876

5.2728

2.7664

0.0187

0.0156

2.8008

2.7664

0.0187

0.6738

3.4589
337.2091 653.3479 990.5570 1.0108 0.0229 1,022.646
2 1.4800e003295.7985 295.7985 5.6700e0035.4200e- 297.5563 003

10.6187

31.9939

0.0236 2.4708 0.6582 2,451.412 2,451.412 0.1563 0.0963 2,484.012 8 8 2

0.0720 2.4708 0.6582 337.2091 3,400.559 3,737.768 1.1728 0.1246 3,804.214 2 2 7
Mitigated Operational
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Area
Energy
Mobile
Total

36.0505

0.0271

1.0368

37.1144

0.7812

0.2317

1.0529

2.0658

21.2767

0.0986

0.0469 2.7664

0.0187

0.0168

2.8020

2.7664

0.0187

2.4876

5.2728

2.7664

0.0187

0.0156

2.8008

2.7664

0.0187

0.6738

3.4589
337.2091 653.3479 990.5570 1.0108 0.0229 1,022.646
2 1.4800e003295.7985 295.7985 5.6700e0035.4200e- 297.5563 003

10.6187

31.9939

0.0236 2.4708 0.6582 2,451.412 2,451.412 0.1563 0.0963 2,484.012 8 8 2

0.0720 2.4708 0.6582 337.2091 3,400.559 3,737.768 1.1728 0.1246 3,804.214 2 2 7

CalEEMod Version: CalEEMod.2020.4.0 Page 5 of 14 Date: 8/12/2022 9:46 AM 7145_San Dimas MCTA 20-0005 - Los Angeles-South Coast County, Summer EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied ROG

0.00 NOx

0.00 CO SO2

0.00 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio-CO2 Total CO2 CH4

0.00 N20

0.00 CO2e
Percent 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Reduction

3.0 Construction Detail
Construction Phase
Phase
Number
Phase Name Phase Type Start Date End Date
8/4/2023
Num Days Num Days
Week
Phase Description
1 Grading Grading 1/1/2023 5 155
Acres of Grading (Site Preparation Phase): 0
Acres of Grading (Grading Phase): 465
Acres of Paving: 0
Residential Indoor: 0; Residential Outdoor: 0; Non-Residential Indoor: 0; Non-Residential Outdoor: 0; Striped Parking Area: 0 (Architectural Coating – sqft)
OffRoad Equipment
Phase Name Offroad Equipment Type
Excavators
Amount Usage Hours

8.00 Horse Power
158
Load Factor
Grading 0.38
Grading
Grading
Grading
Grading
2 1
1 2
2 Graders 8.00

8.00 8.00

8.00 187
247
367
97 0.41

0.40 0.48

0.37 Rubber Tired Dozers
Scrapers
Tractors/Loaders/Backhoes
Trips and VMT
Phase Name Offroad Equipment
Count
Worker Trip
Number
Vendor Trip Hauling Trip Worker Trip Vendor Trip Hauling Trip Worker Vehicle Class
Vendor
Vehicle Class Vehicle Class
Hauling
Number Number Length Length Length
Grading 8 20.00 0.00 4,500.00 14.70 6.90 20.00 LD_MixPage 1231 – 2053 HDT_Mix HHDT CalEEMod Version: CalEEMod.2020.4.0 Page 6 of 14 Date: 8/12/2022 9:46 AM 7145_San Dimas MCTA 20-0005 - Los Angeles-South Coast County, Summer EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied

3.1 Mitigation Measures Construction
Water Exposed Area
Reduce Vehicle Speed on Unpaved Roads

3.2 Grading - 2023
Unmitigated Construction On-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Fugitive Dust
Off-Road
Total

9.2299 0.0000

1.4245

1.4245

9.2299

1.4245

10.6543

3.6577 0.0000

1.3105

1.3105

3.6577

1.3105

4.9683

0.0000 0.0000

3.3217 34.5156 28.0512 0.0621 6,011.477 6,011.477 1.9442 6,060.083 7 7 6

3.3217 34.5156 28.0512 0.0621 9.2299 3.6577 6,011.477 6,011.477 1.9442 6,060.083 7 7 6

CalEEMod Version: CalEEMod.2020.4.0 Page 7 of 14 Date: 8/12/2022 9:46 AM 7145_San Dimas MCTA 20-0005 - Los Angeles-South Coast County, Summer EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied

3.2 Grading - 2023
Unmitigated Construction Off-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Hauling
Vendor
Worker
Total

0.0630

0.0000

0.0640

0.1270

3.7884

0.0000

0.0447

3.8331

1.0112

0.0000

0.7248

1.7359

0.0170

0.0000

0.5082

0.0000

0.2236

0.7317

0.0239

0.0000

0.5321

0.0000

0.2249

0.7570

0.1393

0.0000

0.0593

0.1986

0.0229

0.0000

0.1622

0.0000

0.0605

0.2227
1,865.787 1,865.787 0.1028

0.0000

0.2963

0.0000
1,956.650
4 4 8

0.0000 0.0000 0.0000

1.9800e0031.3500e0031.2400e003202.5226 202.5226 5.0400e0034.6200e- 204.0242 003

0.0190 0.0253 0.0241 2,068.310 2,068.310 0.1079 0.3009 2,160.675 0 0 0
Mitigated Construction On-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Fugitive Dust
Off-Road
Total

4.1534 0.0000

1.4245

1.4245

4.1534

1.4245

5.5779

1.6460 0.0000

1.3105

1.3105

1.6460

1.3105

2.9565

0.0000 0.0000

3.3217 34.5156 28.0512 0.0621 0.0000 6,011.477 6,011.477 1.9442 6,060.083 7 7 6

3.3217 34.5156 28.0512 0.0621 4.1534 1.6460 0.0000 6,011.477 6,011.477 1.9442 6,060.083 7 7 6

CalEEMod Version: CalEEMod.2020.4.0 Page 8 of 14 Date: 8/12/2022 9:46 AM 7145_San Dimas MCTA 20-0005 - Los Angeles-South Coast County, Summer EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied

3.2 Grading - 2023
Mitigated Construction Off-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Hauling
Vendor
Worker
Total

0.0630

0.0000

0.0640

0.1270

3.7884

0.0000

0.0447

3.8331

1.0112

0.0000

0.7248

1.7359

0.0170

0.0000

0.5082

0.0000

0.2236

0.7317

0.0239

0.0000

0.5321

0.0000

0.2249

0.7570

0.1393

0.0000

0.0593

0.1986

0.0229

0.0000

0.1622

0.0000

0.0605

0.2227
1,865.787 1,865.787 0.1028

0.0000

0.2963

0.0000
1,956.650
4 4 8

0.0000 0.0000 0.0000

1.9800e0031.3500e0031.2400e003202.5226 202.5226 5.0400e0034.6200e- 204.0242 003

0.0190 0.0253 0.0241 2,068.310 2,068.310 0.1079 0.3009 2,160.675 0 0 0

CalEEMod Version: CalEEMod.2020.4.0 Page 9 of 14 Date: 8/12/2022 9:46 AM 7145_San Dimas MCTA 20-0005 - Los Angeles-South Coast County, Summer EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied

4.0 Operational Detail - Mobile

4.1 Mitigation Measures Mobile
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Mitigated 1.0368

1.0368

1.0529

1.0529

10.6187

10.6187

0.0236

0.0236

2.4708

2.4708

0.0168

0.0168

2.4876

2.4876

0.6582

0.6582

0.0156

0.0156

0.6738

0.6738
2,451.412 2,451.412 0.1563

0.1563

0.0963

0.0963
2,484.012
8 8 2
Unmitigated 2,451.412 2,451.412 2,484.012
8 8 2

4.2 Trip Summary Information
Average Daily Trip Rate Unmitigated Mitigated
Land Use Weekday Saturday Sunday Annual VMT Annual VMT
Single Family Housing
Total
339.84
339.84
343.44
343.44
307.80
307.80
1,147,402
1,147,402
1,147,402
1,147,402

4.3 Trip Type Information
Miles Trip % Trip Purpose %
Land Use H-W or C-W H-S or C-C H-O or C-NW H-W or C-W H-S or C-C H-O or C-NW Primary 86 Diverted
11 Pass-by
Single Family Housing 14.70 5.90 8.70 40.20 19.20 40.60 3

4.4 Fleet Mix
Land Use LDA LDT1 LDT2

0.188241
MDV

0.126899
LHD1

0.023249
LHD2

0.006239

MHD HHD OBUS UBUS

0.000604

MCY SBUS MH
Single Family Housing 0.542464 0.063735 0.010717 0.008079 0.000923 Page 1235 – 2053 0.024795 0.000702 0.003352 CalEEMod Version: CalEEMod.2020.4.0 Page 10 of 14 Date: 8/12/2022 9:46 AM 7145_San Dimas MCTA 20-0005 - Los Angeles-South Coast County, Summer EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied

5.0 Energy Detail
Historical Energy Use: N

5.1 Mitigation Measures Energy
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
NaturalGas
Mitigated

0.0271

0.0271

0.2317

0.2317

0.0986

0.0986

1.4800e0030.0187

0.0187

0.0187

0.0187

0.0187

0.0187

0.0187

0.0187
295.7985 295.7985 5.6700e0035.4200e- 297.5563
003
NaturalGas
Unmitigated

1.4800e003295.7985 295.7985 5.6700e0035.4200e- 297.5563 003

5.2 Energy by Land Use - NaturalGas
Unmitigated
NaturalGa
s Use
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Land Use kBTU/yr
2514.29
lb/day lb/day
Single Family
Housing

0.0271 0.2317 0.0986 1.4800e0030.0187 0.0187 0.0187 0.0187 295.7985 295.7985 5.6700e0035.4200e- 297.5563 003
Total 0.0271 0.2317 0.0986 1.4800e0030.0187 0.0187 0.0187 0.0187 295.7985 295.7985 5.6700e0035.4200e- 297.5563 003

CalEEMod Version: CalEEMod.2020.4.0 Page 11 of 14 Date: 8/12/2022 9:46 AM 7145_San Dimas MCTA 20-0005 - Los Angeles-South Coast County, Summer EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied

5.2 Energy by Land Use - NaturalGas
Mitigated
NaturalGa
s Use
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Land Use kBTU/yr

2.51429
lb/day lb/day
Single Family
Housing

0.0271 0.2317 0.0986 1.4800e0030.0187 0.0187 0.0187 0.0187 295.7985 295.7985 5.6700e0035.4200e- 297.5563 003
Total 0.0271 0.2317 0.0986 1.4800e0030.0187 0.0187 0.0187 0.0187 295.7985 295.7985 5.6700e0035.4200e- 297.5563 003

6.0 Area Detail

6.1 Mitigation Measures Area
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Mitigated 36.0505

36.0505

0.7812

0.7812

21.2767

21.2767

0.0469

0.0469

2.7664

2.7664

2.7664

2.7664

2.7664

2.7664

2.7664

2.7664
337.2091 653.3479 990.5570
337.2091 653.3479 990.5570

1.0108

1.0108

0.0229

0.0229
1,022.646
2 Unmitigated 1,022.646
2

CalEEMod Version: CalEEMod.2020.4.0 Page 12 of 14 Date: 8/12/2022 9:46 AM 7145_San Dimas MCTA 20-0005 - Los Angeles-South Coast County, Summer EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied

6.2 Area by SubCategory
Unmitigated
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
SubCategory lb/day lb/day
Architectural
Coating

2.1138

24.4141

9.4333

0.0893

36.0505

0.0000

0.0000

2.7500

0.0165

2.7664

0.0000

0.0000

2.7500

0.0165

2.7664

0.0000

0.0000

2.7500

0.0165

2.7664

0.0000

0.0000

2.7500

0.0165

2.7664

0.0000

0.0000

0.0000
Consumer 0.0000
Products
Hearth
Landscaping
Total

0.7469

0.0342

0.7812

18.3079

2.9688

0.0467 337.2091 648.0000 985.2091 1.0056 0.0229 1,017.170 1 1.6000e0045.3479 5.3479 5.1300e0035.4762

21.2767 0.0469 337.2091 653.3479 990.5569 1.0108 0.0229 1,022.646 2

CalEEMod Version: CalEEMod.2020.4.0 Page 13 of 14 Date: 8/12/2022 9:46 AM 7145_San Dimas MCTA 20-0005 - Los Angeles-South Coast County, Summer EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied

6.2 Area by SubCategory
Mitigated
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
SubCategory lb/day lb/day
Architectural
Coating

2.1138

24.4141

9.4333

0.0893

36.0505

0.0000

0.0000

2.7500

0.0165

2.7664

0.0000

0.0000

2.7500

0.0165

2.7664

0.0000

0.0000

2.7500

0.0165

2.7664

0.0000

0.0000

2.7500

0.0165

2.7664

0.0000

0.0000

0.0000
Consumer 0.0000
Products
Hearth
Landscaping
Total

0.7469

0.0342

0.7812

18.3079

2.9688

0.0467 337.2091 648.0000 985.2091 1.0056 0.0229 1,017.170 1 1.6000e0045.3479 5.3479 5.1300e0035.4762

21.2767 0.0469 337.2091 653.3479 990.5569 1.0108 0.0229 1,022.646 2 7.0 Water Detail

7.1 Mitigation Measures Water

CalEEMod Version: CalEEMod.2020.4.0 Page 14 of 14 Date: 8/12/2022 9:46 AM 7145_San Dimas MCTA 20-0005 - Los Angeles-South Coast County, Summer EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied

8.0 Waste Detail

8.1 Mitigation Measures Waste

9.0 Operational Offroad
Equipment Type Number Hours/Day Days/Year Horse Power Load Factor Fuel Type

10.0 Stationary Equipment
Fire Pumps and Emergency Generators
Equipment Type Number Hours/Day Hours/Year Horse Power
Boiler Rating
Load Factor
Fuel Type
Fuel Type
Boilers
Equipment Type Number
Number
Heat Input/Day Heat Input/Year
User Defined Equipment
Equipment Type

11.0 Vegetation

CalEEMod Version: CalEEMod.2020.4.0 Page 1 of 14 Date: 8/12/2022 9:48 AM 7145_San Dimas MCTA 20-0005 - Los Angeles-South Coast County, Winter EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied 7145_San Dimas MCTA 20-0005
Los Angeles-South Coast County, Winter

1.0 Project Characteristics

1.1 Land Usage
Land Uses Size Metric Lot Acreage

90.10 Floor Surface Area
1,233,036.00
Population
Single Family Housing 36.00 Dwelling Unit 103

1.2 Other Project Characteristics
Urbanization
Climate Zone
Urban
9 Wind Speed (m/s) 2.2 Precipitation Freq (Days) 33
Operational Year 2024
Utility Company Southern California Edison
CO2 Intensity 390.98
(lb/MWhr)
CH4 Intensity
(lb/MWhr)

0.033 N2O Intensity
(lb/MWhr)

0.004

1.3 User Entered Comments & Non-Default Data
Project Characteristics -
Land Use - Average lot size = 109,021sq ft; 36 lots= 3,924,756sq ft= 90.1 acres Average available building area= 34,251sq feet; 36 lots= 1,233,036 sqft Construction Phase -
Off-road Equipment - only grading is considered
Off-road Equipment -
Trips and VMT - only grading is considered
On-road Fugitive Dust - only grading is considered
Demolition -
Grading - only grading is considered
Architectural Coating - only grading is considered
Woodstoves - Page 1241 – 2053
CalEEMod Version: CalEEMod.2020.4.0 Page 2 of 14 Date: 8/12/2022 9:48 AM 7145_San Dimas MCTA 20-0005 - Los Angeles-South Coast County, Winter EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Area Coating -
Construction Off-road Equipment Mitigation -
Table Name Column Name Default Value
0 New Value
tblConstDustMitigation 15
tblGrading
WaterUnpavedRoadVehicleSpeed
MaterialImported 0.00 36,000.00
1,233,036.00

90.10 tblLandUse LandUseSquareFeet
LotAcreage
64,800.00
tblLandUse 11.69

2.0 Emissions Summary

CalEEMod Version: CalEEMod.2020.4.0 Page 3 of 14 Date: 8/12/2022 9:48 AM 7145_San Dimas MCTA 20-0005 - Los Angeles-South Coast County, Winter EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied

2.1 Overall Construction (Maximum Daily Emission)
Unmitigated Construction
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Year lb/day lb/day
2023 3.4495 38.5204 29.7424 0.0810 9.9616 1.4498 11.4114 3.8564 1.3347 5.1910 0.0000 8,071.077 8,071.077 2.0520 0.3015 8,212.233 1 1 4
Maximum 3.4495 38.5204 29.7424 0.0810 9.9616 1.4498 11.4114 3.8564 1.3347 5.1910 0.0000 8,071.077 8,071.077 2.0520 0.3015 8,212.233 1 1 4
Mitigated Construction
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Year lb/day lb/day
2023 3.4495 38.5204 29.7424 0.0810 4.8852 1.4498 6.3350 1.8446 1.3347 3.1793 0.0000 8,071.077 8,071.077 2.0520 0.3015 8,212.233 1 1 4
Maximum 3.4495 38.5204 29.7424 0.0810 4.8852 1.4498 6.3350 1.8446 1.3347 3.1793 0.0000 8,071.077 8,071.077 2.0520 0.3015 8,212.233 1 1 4
ROG

0.00 NOx

0.00 CO SO2

0.00 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio-CO2 Total CO2 CH4

0.00 N20

0.00 CO2e
Percent 0.00 50.96 0.00 44.49 52.17 0.00 38.75 0.00 0.00 0.00 0.00 Reduction

CalEEMod Version: CalEEMod.2020.4.0 Page 4 of 14 Date: 8/12/2022 9:48 AM 7145_San Dimas MCTA 20-0005 - Los Angeles-South Coast County, Winter EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied

2.2 Overall Operational
Unmitigated Operational
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Area
Energy
Mobile
Total

36.0505

0.0271

1.0187

37.0963

0.7812

0.2317

1.1370

2.1499

21.2767

0.0986

0.0469 2.7664

0.0187

0.0168

2.8020

2.7664

0.0187

2.4876

5.2728

2.7664

0.0187

0.0156

2.8008

2.7664

0.0187

0.6738

3.4589
337.2091 653.3479 990.5570 1.0108 0.0229 1,022.646
2 1.4800e003295.7985 295.7985 5.6700e0035.4200e- 297.5563 003

10.3796

31.7548

0.0226 2.4708 0.6582 2,347.194 2,347.194 0.1606 0.1005 2,381.163 7 7 3

0.0710 2.4708 0.6582 337.2091 3,296.341 3,633.550 1.1770 0.1288 3,701.365 1 2 8
Mitigated Operational
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Area
Energy
Mobile
Total

36.0505

0.0271

1.0187

37.0963

0.7812

0.2317

1.1370

2.1499

21.2767

0.0986

0.0469 2.7664

0.0187

0.0168

2.8020

2.7664

0.0187

2.4876

5.2728

2.7664

0.0187

0.0156

2.8008

2.7664

0.0187

0.6738

3.4589
337.2091 653.3479 990.5570 1.0108 0.0229 1,022.646
2 1.4800e003295.7985 295.7985 5.6700e0035.4200e- 297.5563 003

10.3796

31.7548

0.0226 2.4708 0.6582 2,347.194 2,347.194 0.1606 0.1005 2,381.163 7 7 3

0.0710 2.4708 0.6582 337.2091 3,296.341 3,633.550 1.1770 0.1288 3,701.365 1 2 8

CalEEMod Version: CalEEMod.2020.4.0 Page 5 of 14 Date: 8/12/2022 9:48 AM 7145_San Dimas MCTA 20-0005 - Los Angeles-South Coast County, Winter EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied ROG

0.00 NOx

0.00 CO SO2

0.00 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio-CO2 Total CO2 CH4

0.00 N20

0.00 CO2e
Percent 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Reduction

3.0 Construction Detail
Construction Phase
Phase
Number
Phase Name Phase Type Start Date End Date
8/4/2023
Num Days Num Days
Week
Phase Description
1 Grading Grading 1/1/2023 5 155
Acres of Grading (Site Preparation Phase): 0
Acres of Grading (Grading Phase): 465
Acres of Paving: 0
Residential Indoor: 0; Residential Outdoor: 0; Non-Residential Indoor: 0; Non-Residential Outdoor: 0; Striped Parking Area: 0 (Architectural Coating – sqft)
OffRoad Equipment
Phase Name Offroad Equipment Type
Excavators
Amount Usage Hours

8.00 Horse Power
158
Load Factor
Grading 0.38
Grading
Grading
Grading
Grading
2 1
1 2
2 Graders 8.00

8.00 8.00

8.00 187
247
367
97 0.41

0.40 0.48

0.37 Rubber Tired Dozers
Scrapers
Tractors/Loaders/Backhoes
Trips and VMT
Phase Name Offroad Equipment
Count
Worker Trip
Number
Vendor Trip Hauling Trip Worker Trip Vendor Trip Hauling Trip Worker Vehicle Class
Vendor
Vehicle Class Vehicle Class
Hauling
Number Number Length Length Length
Grading 8 20.00 0.00 4,500.00 14.70 6.90 20.00 LD_MixPage 1245 – 2053 HDT_Mix HHDT CalEEMod Version: CalEEMod.2020.4.0 Page 6 of 14 Date: 8/12/2022 9:48 AM 7145_San Dimas MCTA 20-0005 - Los Angeles-South Coast County, Winter EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied

3.1 Mitigation Measures Construction
Water Exposed Area
Reduce Vehicle Speed on Unpaved Roads

3.2 Grading - 2023
Unmitigated Construction On-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Fugitive Dust
Off-Road
Total

9.2299 0.0000

1.4245

1.4245

9.2299

1.4245

10.6543

3.6577 0.0000

1.3105

1.3105

3.6577

1.3105

4.9683

0.0000 0.0000

3.3217 34.5156 28.0512 0.0621 6,011.477 6,011.477 1.9442 6,060.083 7 7 6

3.3217 34.5156 28.0512 0.0621 9.2299 3.6577 6,011.477 6,011.477 1.9442 6,060.083 7 7 6

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3.2 Grading - 2023
Unmitigated Construction Off-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Hauling
Vendor
Worker
Total

0.0589

0.0000

0.0688

0.1277

3.9554

0.0000

0.0493

4.0048

1.0251

0.0000

0.6662

1.6912

0.0170

0.0000

0.5082

0.0000

0.2236

0.7317

0.0240

0.0000

0.5322

0.0000

0.2249

0.7571

0.1393

0.0000

0.0593

0.1986

0.0229

0.0000

0.1623

0.0000

0.0605

0.2228
1,867.754 1,867.754 0.1026

0.0000

0.2966

0.0000
1,958.707
0 0 4

0.0000 0.0000 0.0000

1.8700e0031.3500e0031.2400e003191.8453 191.8453 5.1100e0034.9300e- 193.4424 003

0.0189 0.0253 0.0242 2,059.599 2,059.599 0.1077 0.3015 2,152.149 4 4 8
Mitigated Construction On-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Fugitive Dust
Off-Road
Total

4.1534 0.0000

1.4245

1.4245

4.1534

1.4245

5.5779

1.6460 0.0000

1.3105

1.3105

1.6460

1.3105

2.9565

0.0000 0.0000

3.3217 34.5156 28.0512 0.0621 0.0000 6,011.477 6,011.477 1.9442 6,060.083 7 7 6

3.3217 34.5156 28.0512 0.0621 4.1534 1.6460 0.0000 6,011.477 6,011.477 1.9442 6,060.083 7 7 6

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3.2 Grading - 2023
Mitigated Construction Off-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Hauling
Vendor
Worker
Total

0.0589

0.0000

0.0688

0.1277

3.9554

0.0000

0.0493

4.0048

1.0251

0.0000

0.6662

1.6912

0.0170

0.0000

0.5082

0.0000

0.2236

0.7317

0.0240

0.0000

0.5322

0.0000

0.2249

0.7571

0.1393

0.0000

0.0593

0.1986

0.0229

0.0000

0.1623

0.0000

0.0605

0.2228
1,867.754 1,867.754 0.1026

0.0000

0.2966

0.0000
1,958.707
0 0 4

0.0000 0.0000 0.0000

1.8700e0031.3500e0031.2400e003191.8453 191.8453 5.1100e0034.9300e- 193.4424 003

0.0189 0.0253 0.0242 2,059.599 2,059.599 0.1077 0.3015 2,152.149 4 4 8

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4.0 Operational Detail - Mobile

4.1 Mitigation Measures Mobile
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Mitigated 1.0187

1.0187

1.1370

1.1370

10.3796

10.3796

0.0226

0.0226

2.4708

2.4708

0.0168

0.0168

2.4876

2.4876

0.6582

0.6582

0.0156

0.0156

0.6738

0.6738
2,347.194 2,347.194 0.1606

0.1606

0.1005

0.1005
2,381.163
7 7 3
Unmitigated 2,347.194 2,347.194 2,381.163
7 7 3

4.2 Trip Summary Information
Average Daily Trip Rate Unmitigated Mitigated
Land Use Weekday Saturday Sunday Annual VMT Annual VMT
Single Family Housing
Total
339.84
339.84
343.44
343.44
307.80
307.80
1,147,402
1,147,402
1,147,402
1,147,402

4.3 Trip Type Information
Miles Trip % Trip Purpose %
Land Use H-W or C-W H-S or C-C H-O or C-NW H-W or C-W H-S or C-C H-O or C-NW Primary 86 Diverted
11 Pass-by
Single Family Housing 14.70 5.90 8.70 40.20 19.20 40.60 3

4.4 Fleet Mix
Land Use LDA LDT1 LDT2

0.188241
MDV

0.126899
LHD1

0.023249
LHD2

0.006239

MHD HHD OBUS UBUS

0.000604

MCY SBUS MH
Single Family Housing 0.542464 0.063735 0.010717 0.008079 0.000923 Page 1249 – 2053 0.024795 0.000702 0.003352 CalEEMod Version: CalEEMod.2020.4.0 Page 10 of 14 Date: 8/12/2022 9:48 AM 7145_San Dimas MCTA 20-0005 - Los Angeles-South Coast County, Winter EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied

5.0 Energy Detail
Historical Energy Use: N

5.1 Mitigation Measures Energy
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
NaturalGas
Mitigated

0.0271

0.0271

0.2317

0.2317

0.0986

0.0986

1.4800e0030.0187

0.0187

0.0187

0.0187

0.0187

0.0187

0.0187

0.0187
295.7985 295.7985 5.6700e0035.4200e- 297.5563
003
NaturalGas
Unmitigated

1.4800e003295.7985 295.7985 5.6700e0035.4200e- 297.5563 003

5.2 Energy by Land Use - NaturalGas
Unmitigated
NaturalGa
s Use
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Land Use kBTU/yr
2514.29
lb/day lb/day
Single Family
Housing

0.0271 0.2317 0.0986 1.4800e0030.0187 0.0187 0.0187 0.0187 295.7985 295.7985 5.6700e0035.4200e- 297.5563 003
Total 0.0271 0.2317 0.0986 1.4800e0030.0187 0.0187 0.0187 0.0187 295.7985 295.7985 5.6700e0035.4200e- 297.5563 003

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5.2 Energy by Land Use - NaturalGas
Mitigated
NaturalGa
s Use
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Land Use kBTU/yr

2.51429
lb/day lb/day
Single Family
Housing

0.0271 0.2317 0.0986 1.4800e0030.0187 0.0187 0.0187 0.0187 295.7985 295.7985 5.6700e0035.4200e- 297.5563 003
Total 0.0271 0.2317 0.0986 1.4800e0030.0187 0.0187 0.0187 0.0187 295.7985 295.7985 5.6700e0035.4200e- 297.5563 003

6.0 Area Detail

6.1 Mitigation Measures Area
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Mitigated 36.0505

36.0505

0.7812

0.7812

21.2767

21.2767

0.0469

0.0469

2.7664

2.7664

2.7664

2.7664

2.7664

2.7664

2.7664

2.7664
337.2091 653.3479 990.5570
337.2091 653.3479 990.5570

1.0108

1.0108

0.0229

0.0229
1,022.646
2 Unmitigated 1,022.646
2

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6.2 Area by SubCategory
Unmitigated
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
SubCategory lb/day lb/day
Architectural
Coating

2.1138

24.4141

9.4333

0.0893

36.0505

0.0000

0.0000

2.7500

0.0165

2.7664

0.0000

0.0000

2.7500

0.0165

2.7664

0.0000

0.0000

2.7500

0.0165

2.7664

0.0000

0.0000

2.7500

0.0165

2.7664

0.0000

0.0000

0.0000
Consumer 0.0000
Products
Hearth
Landscaping
Total

0.7469

0.0342

0.7812

18.3079

2.9688

0.0467 337.2091 648.0000 985.2091 1.0056 0.0229 1,017.170 1 1.6000e0045.3479 5.3479 5.1300e0035.4762

21.2767 0.0469 337.2091 653.3479 990.5569 1.0108 0.0229 1,022.646 2

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6.2 Area by SubCategory
Mitigated
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
SubCategory lb/day lb/day
Architectural
Coating

2.1138

24.4141

9.4333

0.0893

36.0505

0.0000

0.0000

2.7500

0.0165

2.7664

0.0000

0.0000

2.7500

0.0165

2.7664

0.0000

0.0000

2.7500

0.0165

2.7664

0.0000

0.0000

2.7500

0.0165

2.7664

0.0000

0.0000

0.0000
Consumer 0.0000
Products
Hearth
Landscaping
Total

0.7469

0.0342

0.7812

18.3079

2.9688

0.0467 337.2091 648.0000 985.2091 1.0056 0.0229 1,017.170 1 1.6000e0045.3479 5.3479 5.1300e0035.4762

21.2767 0.0469 337.2091 653.3479 990.5569 1.0108 0.0229 1,022.646 2 7.0 Water Detail

7.1 Mitigation Measures Water

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8.0 Waste Detail

8.1 Mitigation Measures Waste

9.0 Operational Offroad
Equipment Type Number Hours/Day Days/Year Horse Power Load Factor Fuel Type

10.0 Stationary Equipment
Fire Pumps and Emergency Generators
Equipment Type Number Hours/Day Hours/Year Horse Power
Boiler Rating
Load Factor
Fuel Type
Fuel Type
Boilers
Equipment Type Number
Number
Heat Input/Day Heat Input/Year
User Defined Equipment
Equipment Type

11.0 Vegetation

❖ APPENDICES ❖

APPENDIX C

BIOLOGICAL RESOURCES EVALUATION

Biological Resources Evaluation Report

FOR THE
SAN DIMAS MUNICIPAL CODE TEXT AMENDMENT 20-0005)

CITY OF SAN DIMAS, LOS ANGELES COUNTY, CALIFORNIA
In Support of the CEQA Analysis
Prepared for:

City of San Dimas
245 East Bonita Avenue
San Dimas, CA 91773
Prepared by:
16431 Scientific Way
Irvine, CA 92618
Phone: (949) 788-4900, Fax: (949) 788-4901
UltraSystems Project No. 7145
Assessor Parcel Number.: 8387-006-903
October 2022
REVISED DECEMBER, 2022

This page intentionally left blank.

❖ TABLE OF CONTENTS ❖

TABLE OF CONTENTS
TABLE OF CONTENTS ............................................................................................................................................ i ACRONYMS AND ABBREVIATIONS..................................................................................................................vi EXECUTIVE SUMMARY ..................................................................................................................................... viii

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

1.1 1.2

1.3 BRE Purpose........................................................................................................................................... 1-1 Project Location.................................................................................................................................... 1-2 Project Background............................................................................................................................. 1-2

2.0 3.0
PROJECT DESCRIPTION.....................................................................................................................2-1

2.1 2.2
Proposed Municipal Code Text Amendments.......................................................................... 2-1 Project Operation................................................................................................................................. 2-2 REGULATORY CONTEXT....................................................................................................................3-1

3.1 Federal Statues, Regulations and Executive Orders.............................................................. 3-1

3.1.1 Clean Water Act (CWA)...................................................................................................... 3-1

3.1.2 Endangered Species Act (ESA)........................................................................................ 3-2

3.1.3 Migratory Bird Treaty Act (MBTA)............................................................................... 3-3

3.1.4 National Environmental Policy Act (NEPA).............................................................. 3-4

3.1.5 Prevention and Control of Invasive Species - Executive Order 13112 .......... 3-4 State Statutes and Regulations....................................................................................................... 3-4

3.2.1 California Environmental Quality Act (CEQA) ......................................................... 3-4

3.2.2 California Endangered Species Act (CESA)................................................................ 3-5

3.2.3 Fully Protected Species - California Fish and Game Code § 3511, § 4700, § 5050 and § 5515................................................................................................................... 3-6

3.2.4 Bird Nests and Eggs - California Fish and Game Code § 3503........................... 3-6

3.2.5 Native Plant Protection Act (NPPA) – California Fish and Game Code §§ 1900-1913............................................................................................................................... 3-7

3.2.6 Construction General Permit; Order 2009-0009-DWQ........................................ 3-7

3.2.7 Porter-Cologne Water Quality Control Act................................................................ 3-8

3.2.8 State Water Resources Control Board Resolution No. 2019-0015.................. 3-8

3.2.9 Basin Plans............................................................................................................................3-10

3.2.10 Lake or Streambed Alteration Agreement ..............................................................3-10

3.2.11 Natural Community Conservation Planning Act of 2003 (NCCP Act) ..........3-10 Regional and Local Ordinances, Plans and Policies .............................................................3-10

3.3.1 Significant Ecological Areas...........................................................................................3-10

3.3.2 Chapter 18.162 Tree Preservation..............................................................................3-11

3.2 3.3

4.0 STUDY METHODS.................................................................................................................................4-1

4.1 Literature Review and Findings..................................................................................................... 4-1

4.1.1 Topography and Physical Features .............................................................................. 4-1

4.1.2 Soils............................................................................................................................................ 4-1

4.1.3 Sensitive Vegetation Communities and Special-Status Plant and Wildlife Species ...................................................................................................................................... 4-1

4.1.4 Protected Trees..................................................................................................................... 4-4

4.1.5 Waters of the U.S. and State (including Wetlands)................................................. 4-4 7145/San Dimas MCTA 20-0005 Page i
Biological Resources Evaluation Report Page 1258 – 2053 December 2022 ❖ TABLE OF CONTENTS ❖

4.1.6 Critical Habitat ...................................................................................................................... 4-5

4.1.7 Wildlife Corridors ................................................................................................................ 4-6

4.1.8 Significant Ecological Areas (SEAs).............................................................................. 4-6 Field Survey Methods......................................................................................................................... 4-7

4.2.1 Habitat Assessment and Land Cover Type Mapping............................................. 4-8

4.2.2 General Plant Surveys ........................................................................................................ 4-9

4.2.3 General Wildlife Surveys.................................................................................................4-10

4.2.4 Waters of the U.S. and State (including Wetlands)...............................................4-11

4.2.5 Wildlife Movement Evaluation.....................................................................................4-11

4.2 5.0 RESULTS..................................................................................................................................................5-1

5.1 Environmental Setting....................................................................................................................... 5-1

5.1.1 Land Use................................................................................................................................... 5-1

5.1.2 Local Climate.......................................................................................................................... 5-1

5.1.3 Soils............................................................................................................................................ 5-1 Land Cover Types ................................................................................................................................ 5-2

5.2.1 California Buckwheat Scrub (Eriogonum fasciculatum Shrubland Alliance) .5- 7 5.2

5.2.2 California Buckwheat Scrub, Disturbed (Eriogonum fasciculatum Shrubland Alliance) ................................................................................................................................... 5-7

5.2.3 California Sagebrush – Black Sage Scrub (Artemisia californica - Salvia mellifera Shrubland Alliance).......................................................................................... 5-8

5.2.4 California Walnut Groves (Juglans californica Forest & Woodland Alliance) 5- 8 5.2.5 California Walnut Groves, Disturbed (Juglans californica Forest & Woodland Alliance) ................................................................................................................................... 5-8

5.2.6 Coast Live Oak Woodland and Forest, disturbed (Quercus agrifolia Forest & Woodland Alliance)............................................................................................................. 5-9

5.2.7 Coast Prickly Pear Scrub (Opuntia littoralis - Opuntia oricola - Cylindropuntia prolifera Shrubland Alliance).......................................................................................... 5-9

5.2.8 Developed/Ornamental...................................................................................................5-10

5.2.9 Pepper tree groves (Schinus [molle, terebinthifolius] - Myoporum laetum Forest & Woodland Semi-Natural Alliance)............................................................5-10

5.2.10 Upland Mustards or Star-Thistle Fields (Brassica nigra - Centaurea (solstitialis, melitensis) Herbaceous Semi-Natural Alliance)............................5-10

5.2.11 Upland Mustards or Star-Thistle Fields, Mowed (Brassica nigra - Centaurea (solstitialis, melitensis) Herbaceous Semi-Natural Alliance)............................5-10 Plants.......................................................................................................................................................5-11

5.3.1 Plant Species Recorded During the Field Surveys................................................5-11

5.3.2 Non-Native Plants..............................................................................................................5-11

5.3.3 Listed Endangered, Threatened, Candidate, and State Rare Plants ..............5-12

5.3.4 Sensitive Plants...................................................................................................................5-12 Wildlife...................................................................................................................................................5-13

5.4.1 Wildlife Species Recorded During the Field Surveys ..........................................5-14

5.4.2 Listed Endangered, Threatened, and Candidate Wildlife..................................5-15

5.4.3 Sensitive Wildlife................................................................................................................5-17 Waters of the U.S. and State (including Wetlands) ..............................................................5-20 Critical Habitat ....................................................................................................................................5-20 Wildlife Corridors ..............................................................................................................................5-20

5.3 5.4

5.5 5.6

5.7 7145/San Dimas MCTA 20-0005 Page ii
Biological Resources Evaluation Report Page 1259 – 2053 December 2022 ❖ TABLE OF CONTENTS ❖

5.8 Significant Ecological Areas: East San Gabriel Significant Ecological Area................5-21

6.0 POTENTIAL IMPACTS OF THE PROJECT ......................................................................................6-1

6.1 6.2

6.3 6.4
Limitations of Survey Data and Analyses................................................................................... 6-1 Impact Types.......................................................................................................................................... 6-2 Thresholds of Significance ............................................................................................................... 6-3 Potential Impacts to Vegetation Communities (Land Cover Types)............................... 6-5

6.4.1 Direct Impacts ....................................................................................................................... 6-5

6.4.2 Indirect Impacts.................................................................................................................... 6-6

6.4.3 Mitigation Measures ........................................................................................................... 6-6

6.4.4 Impact Determination........................................................................................................ 6-7 Potential Impacts to Special-Status Plants................................................................................ 6-7

6.5.1 Direct Impacts ....................................................................................................................... 6-7

6.5.2 Indirect Impacts.................................................................................................................... 6-8

6.5.3 Mitigation Measures ........................................................................................................... 6-8

6.5.4 Impact Determination........................................................................................................ 6-9 Potential Impacts to Special-Status Wildlife............................................................................. 6-9

6.6.1 Direct Impacts ....................................................................................................................... 6-9

6.6.2 Indirect Impacts..................................................................................................................6-10

6.6.3 Mitigation Measures .........................................................................................................6-11

6.6.4 Impact Determination......................................................................................................6-12 Potential Impacts to Breeding Birds..........................................................................................6-12

6.7.1 Direct Impacts .....................................................................................................................6-12

6.7.2 Indirect Impacts..................................................................................................................6-13

6.7.3 Mitigation Measures .........................................................................................................6-13

6.7.4 Impact Determination......................................................................................................6-13 Potential Impacts to Waters of the U.S. and State, Including Wetlands ......................6-13

6.8.1 Direct Impacts .....................................................................................................................6-14

6.8.2 Indirect Impacts..................................................................................................................6-14

6.8.3 Mitigation Measures .........................................................................................................6-15

6.8.4 Impact Determination......................................................................................................6-15 Potential Impacts to Critical Habitat..........................................................................................6-15

6.9.1 Direct and Indirect Impacts ...........................................................................................6-16

6.9.2 Mitigation Measures .........................................................................................................6-16

6.9.3 Impact Determination......................................................................................................6-16

6.5 6.6

6.7 6.8

6.9 6.10 Potential Impacts to Fish or Wildlife Movement or Native Wildlife Nursery Sites........................................................................................................................................6-16

6.10.1 Direct Impacts .....................................................................................................................6-16

6.10.2 Indirect Impacts..................................................................................................................6-16

6.10.3 Mitigation Measures .........................................................................................................6-17

6.10.4 Impact Determination......................................................................................................6-17

6.11 Potential Impacts to Local Policies Protecting Biological Resources...........................6-17

6.11.1 Direct Impacts .....................................................................................................................6-18

6.11.2 Indirect Impacts..................................................................................................................6-18

6.11.3 Mitigation Measures .........................................................................................................6-18

6.11.4 Impact Determination......................................................................................................6-18

6.12 Potential Impacts to HCPs or NCCPs..........................................................................................6-19

6.12.1 Mitigation Measures .........................................................................................................6-19

6.12.2 Impact Determination......................................................................................................6-19 7145/San Dimas MCTA 20-0005 Page iii
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7.0 MITIGATION MEASURES ...................................................................................................................7-1

7.1 7.2

7.3 7.4

7.5 BIO-1: Vegetation Community Replacement Plan.................................................................. 7-1 BIO-2: Project Limits and Designated Areas............................................................................. 7-2 BIO-3: General Vegetation and Wildlife Avoidance............................................................... 7-2 BIO-4: Focused Botanical Surveys ................................................................................................ 7-3 BIO-5: Habitat Assessment for Least Bell’s Vireo and Southwestern Willow Flycatcher................................................................................................................................ 7-4 BIO-6: Focused Coastal California Gnatcatcher Surveys ..................................................... 7-4 BIO-7: Focused Cactus Wren Surveys ......................................................................................... 7-5 BIO-8: Preconstruction Mountain Lion Surveys (for Natal Dens) ................................... 7-5 BIO-9: Preconstruction Wildlife Surveys ................................................................................... 7-6

7.6 7.7

7.8 7.9

7.10 BIO-10: 14-Day Preconstruction Burrowing Owl Surveys ................................................. 7-7

7.11 BIO-11: Preconstruction Bat Surveys.......................................................................................... 7-8

7.12 BIO-12: Preconstruction Breeding Bird Survey...................................................................... 7-8

7.13 BIO-13: Worker Environmental Awareness Program (WEAP)........................................ 7-9

7.14 BIO-14: Biological Monitor ............................................................................................................7-10

7.15 BIO-15: Wildlife Entrapment Avoidance..................................................................................7-10

7.16 BIO-16: Construction Best Management Practices..............................................................7-11

7.17 BIO-17: Jurisdictional Delineation Survey and Report.......................................................7-11

7.18 BIO-18: Mature Significant Tree Protection Measures.......................................................7-12

8.0 POTENTIAL FEDERAL, STATE AND LOCAL BIOLOGICAL PERMITS, AND APPROVALS ...........................................................................................................................................8-1

8.1 8.2

8.3 Section 404 Preconstruction Notification.................................................................................. 8-1 Section 401 Water Quality Certification..................................................................................... 8-1 State Water Resources Control Board Waste Discharge Requirements Permit ....................................................................................................................................................... 8-2 Lake or Streambed Alteration Agreement................................................................................. 8-2 Construction Stormwater Permits................................................................................................ 8-2 Incidental Take Permits .................................................................................................................... 8-2 Compensatory Habitat Mitigation and Monitoring Plan...................................................... 8-3 Tree Removal Permit.......................................................................................................................... 8-3

8.4 8.5

8.6 8.7

8.8 9.0 LITERATURE CITED AND REFERENCES .......................................................................................9-1 TABLES
Table 2.0-1 – Grading Permitted Under Existing Specific Plan and Proposed Amendments.......................................................................................................................................................... 2-1 Table 4.1-2 - CNDDB Sensitive Habitat Recorded within Ten Miles of the BSA ...................................... 4-3 Table 4.2-1 - Field Survey Information..................................................................................................................... 4-8 Table 5.1-1 - Summary of Mapped Soil Units......................................................................................................... 5-2 Table 5.2-1 - Acreage of Mapped Land Cover Types Within the BSA........................................................... 5-3 Table 5.3-1 - Recorded Invasive Plant Species with A CAL IPC Rating......................................................5-11 Table 6.2-1 – Residential Lots and Associated Assessor’s Parcel Numbers (APNs).............................. 6-2 Table 7.0-1 – Residential Lots and Associated Mitigation Measures ........................................................... 7-2 7145/San Dimas MCTA 20-0005 Page iv
Biological Resources Evaluation Report Page 1261 – 2053 December 2022 ❖ TABLE OF CONTENTS ❖

APPENDICES
Appendix A Figures
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Figure 1: Project Boundary and Biological Study Area (BSA) Figure 2: Regional Location
Figure 3: Project Vicinity
Figure 4: USGS Topographic Quadrangle Map
Figure 5: Parcel Map
Figure 6: USDA Soils
Figure 7: CNDDB Known Occurrences Plant Species and Habitat Figure 8: CNDDB Known Occurrences Wildlife Species and Habitat Figure 9: Land Cover Overview Map
Figure 9a: Land Cover (Lots 1 - 10)
Figure 9b: Land Cover (Lots 11 - 16)
Figure 9c: Land Cover (Lots 17 - 23)
Figure 9d: Land Cover (Lots 24 - 26)
Figure 9e: Land Cover (Lots 27 - 36)
Figure 10: Land Cover Types Impacts Overview Map
Figure 10a: Land Cover Impacts (Lots 1 - 10)
Figure 10b: Land Cover Impacts (Lots 11 - 16)
Figure 10c: Land Cover Impacts (Lots 17 - 23)
Figure 10d: Land Cover Impacts (Lots 24 - 26)
Figure 10e: Land Cover Impacts (Lots 27 - 36)
Figure 11: USGS Surface Waters and Watersheds
Figure 12: Biological Constraints Overview
Figure 12a: Biological Constraints (Lots 1 – 10)
Figure 12b: Biological Constraints (Lots 11 – 16)
Figure 12c: Biological Constraints (Lots 17 – 23)
Figure 12d: Biological Constraints (Lots 24 – 26)
Figure 12d: Biological Constraints (Lots 27 – 36)
Figure 13: USFWS Critical Habitats
Figure 14: CDFW Wildlife Corridors
Figure 15: Significant Ecological Areas (SEAs)
Figure 16: Residential Lots and Associated Assessor’s Parcel Numbers (APNs) Appendix B
Appendix C
Appendix D
Appendix E
Appendix F
Special-Status Species and Potential Occurrence Determination.

Soils Report
Plant and Wildlife Species Observed During Field Surveys Representative Site Photographs
Lot-Specific Impacts
7145/San Dimas MCTA 20-0005 Page v
Biological Resources Evaluation Report Page 1262 – 2053 December 2022 ❖ ACRONYMS AND ABBREVIATIONS ❖

ACRONYMS AND ABBREVIATIONS
Acronym/Abbreviation Term
amsl above mean sea level
AOU American Ornithological Union
APHIS
APN
Animal and Plant Health Inspection Service
Assessor’s Parcel Number
BMPs
BRE
best management practices
Biological Resources Evaluation Report
BSA Biological Study Area
BUOW
Cal-IPC
CDFW
CEQA
CESA
CFR
burrowing owl
California Invasive Plant Council
California Department of Fish and Wildlife
California Environmental Quality Act
California Endangered Species Act
Code of Federal Regulations
City City of San Dimas
CNDDB
CNPS
County
CRPR
cuckoo
CWA
DBESP
DSH
California Natural Diversity Database
California Native Plant Society
Los Angeles County
California Rare Plant Rank
western yellow-billed cuckoo
Clean Water Act
Determination of Biologically Equivalent or Superior Preservation diameter at standard height
ESA Endangered Species Act
°F degrees Fahrenheit
FAC facultative
FACW
GIS
facultative wetland
Geographic Information System
GPS Global Positioning System
HCP Habitat Conservation Plan
HMMP
IPaC
Compensatory Habitat Mitigation and Monitoring Plan
Information, Planning, and Conservation System
International Society of Arboriculture
least Bell’s vireo
ISA
LBV
MBTA
MCTA
MOU
NCCP
NCCP Act
NEPA
Migratory Bird Treaty Act
Municipal Code Text Amendment
Memorandum of Understanding
Natural Community Conservation Plan
California Natural Community Conservation Planning Act
National Environmental Policy Act
7145/San Dimas MCTA 20-0005 Page vi
Biological Resources Evaluation Report Page 1263 – 2053 December 2022 ❖ ACRONYMS AND ABBREVIATIONS ❖
Acronym/Abbreviation Term
NHD National Hydrography Dataset
NMFS National Marine Fisheries Service
NPDES
NPPA
National Pollutant Discharge Elimination System
Native Plant Protection Act
NRCS Natural Resources Conservation Service
NWI National Wetlands Inventory
OHWM
Porter-Cologne
Rapanos
RWQCB
ordinary high water mark
Porter-Cologne Water Quality Control Act
Rapanos v. United States
Regional Water Quality Control Board
Regional Supplement to the Corps of Engineers Wetland Delineation Manual: Arid West Region (Version 2.0)
Solid Waste Agency of Northern Cook County vs. United States Army Corps of Engineers
Arid West Supplement
SWANCC
SWFL southwestern willow flycatchers
Storm Water Pollution Prevention Plan
State Water Resources Control Board
UltraSystems Environmental, Inc.

United States
SWPPP
SWRCB
UltraSystems
U.S.

U.S.C. United States Code
USACE
1987 Manual
USDA
United States Army Corps of Engineers
Corps of Engineers Wetlands Delineation Manual
United States Department of Agriculture
United States Environmental Protection Agency
United States Fish and Wildlife Service
United States Geological Survey
Waters of the United States
USEPA
USFWS
USGS
Waters of the U.S.

WDRs Waste Discharge Requirement
Worker Environmental Awareness Program
Water Quality Certification
WEAP
WQC
§ Section
§§ Sections
7145/San Dimas MCTA 20-0005 Page vii
Biological Resources Evaluation Report Page 1264 – 2053 December 2022 ❖ EXECUTIVE SUMMARY ❖

EXECUTIVE SUMMARY
UltraSystems Environmental Inc. (UltraSystems) was retained by the City of San Dimas (City) to conduct biological surveys for the proposed Municipal Code Text Amendment (MCTA) 20-0005. The City of San Dimas is located in southeastern Los Angeles County, approximately 30 miles east of the City of Los Angeles.

The proposed MCTA 20-0005 would allow for up to one thousand (1,000) cubic yards of grading, cut and fill, beyond that grading necessary for the primary residence, driveway and garage (residence) for properties located within the proposed MCTA planning area (Planning Area I, Specific Plan 11).

However, the proposed development area (project site(s)) includes the residence plus vacant land, up to the Scenic Easement area “conservation easement boundary” within each parcel. Per the previous Development Plan Review Board policy, a swimming pool and five (5) feet of decking surrounding the pool were exempted from the additional grading calculations, which will be codified as part of the proposed MCTA 20-0005. The proposed MCTA 20-0005 would also include development standards for the grading, landscaping and any retaining walls that the additional grading would require. Additional clean-up items are proposed by removing sections which dealt with the initial development of the area and codifying previous policies regarding Conditional Uses within the specific plan. UltraSystems has prepared this Biological Resources Evaluation (BRE) Report for the MCTA 20-0005.

UltraSystems conducted a literature review and general surveys of the biological resources potentially associated with the proposed MCTA planning area; this area is referred to as the Biological Study Area (BSA) in this BRE. The BSA encompasses approximately 105.5 acres and includes all areas that could potentially be impacted by the project. Surveys did not extend beyond the BSA. The general biological surveys covered all accessible areas of the BSA. Biologists visited the BSA to conduct the following biological surveys:
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Habitat assessment and plant community mapping.

General plant surveys.

General wildlife surveys.

Wildlife movement evaluation.

Jurisdictional assessment of waters of the U.S. or State.

This BRE documents the methods and results of the literature review and the field surveys and provides a summary of existing conditions, an assessment of the potential presence of sensitive biological resources, and an analysis of the potential impacts to those resources from project construction and development. It summarizes the biological resources present within the BSA at the time of the field surveys including land cover types, plants and wildlife species, the potential occurrence of special-status plant and wildlife species, waters of the U.S. and State, critical habitat, and potential wildlife corridors within the BSA. The BRE also identifies and analyzes the potential biological significance of implementation of the proposed MCTA 20-0005 in view of federal, state, and local laws, regulations, policies, orders, ordinances and/or management plans, and the project’s consistency with local policies and ordinances protecting biological resources.

This BRE was prepared in support of the California Environmental Quality Act (CEQA) review conducted in connection with the project, as well as permits and approvals required for the project by federal and state resource agencies.
7145/San Dimas MCTA 20-0005 Page viii
Biological Resources Evaluation Report Page 1265 – 2053 December 2022 ❖ EXECUTIVE SUMMARY ❖
Eleven land cover types were observed and mapped within the BSA during the field surveys, seven of which are considered sensitive by CDFW.

Approximately 53 plant species from 29 distinct plant families were observed within the BSA during the field survey. The dominant tree species are coast live oak and California black walnut, with occasional stands of Peruvian pepper trees; however, no special-status plant species were observed within the BSA during the surveys. Coast live oak, California black walnut, and other mature significant trees occur throughout the planning area. Coast live oak woodland and California black walnut woodland are considered to be sensitive by CDFW. Additionally, the City of San Dimas requires tree removal permits and adherence to applicable replacement standards, as per Chapter

18.62 Tree Preservation of San Dimas Municipal Code, are required for project activities that would remove or cause damage to these trees.

Seventeen bird species, seven mammal species, and one invertebrate species were observed within the BSA. Three special-status species, monarch butterfly, Nuttall’s woodpecker, and Cooper’s hawk were observed within the BSA during field surveys.

The BSA contains mapped water features including freshwater forested/shrub wetlands, riverine areas, and forested/shrub riparian areas. Evidence of hydrologic features, including potential waters of the U.S. and State, were observed within the BSA.

The BSA is not located within a designated or proposed United States Fish and Wildlife Service (USFWS)-designated critical habitat for listed plant or wildlife species. The nearest USFWSdesignated critical habitat is for the federal listed species coastal California gnatcatcher (Polioptila californica californica), located approximately 1.5 miles from the BSA.

The BSA acts as a hunting, foraging, and movement area; therefore, the BSA and surrounding areas are suitable wildlife movement corridors. Additionally, the BSA supports habitat for bat maternity roosts and hibernacula (i.e., native wildlife nursery sites).

Implementation of the proposed MCTA 20-0005 would result in direct and indirect impacts to biological resources, including potentially significant impacts to sensitive wildlife species and tree resources. Best management practices, avoidance and protection measures, and mitigation measures are recommended in this BRE to minimize or avoid impacts to biological resources. Implementation of these measures would reduce such impacts to less than significant levels.

Disclaimer Regarding MCTA Biological Analyses: The avoidance, minimization, and compensatory mitigation measures provided in Section 7.0 Mitigation Measures are intended to comprehensively address the potential impacts to biological resources within SP-11 as an entire ecological unit, and per individual parcel, based on preliminary reconnaissance surveys for the purposes of the MCTA. The MCTA considered conceptual impact areas at the time of review and were not applicable to project-specific impacts, which are unknown at this time.

The biological constraints that may require avoidance, minimization, and compensatory mitigation include sensitive vegetation communities, special-status species (e.g., plants and wildlife), seasonal species protections (e.g., reproduction and overwintering), jurisdictional wetlands and waters, riparian drainage segments, protected trees, wildlife corridors, and land management designations.

A qualified biologist will perform focused biological surveys for construction approvals, based on 65 percent to 95 percent complete professional engineering drawings at the time of proposed 7145/San Dimas MCTA 20-0005 Page ix
Biological Resources Evaluation Report Page 1266 – 2053 December 2022 ❖ EXECUTIVE SUMMARY ❖
development of each individual parcel. The biologist conducting the focused surveys will incorporate the focused survey results and those of the reconnaissance surveys (UltraSystems, 2022) to assign the relevant mitigation for each individual project. The City will require the mitigation in the construction specifications prior to issuance of grading plans approved for each individual land owner (or project applicant). The mitigation measures contained herein are legally binding and are required if impacts to protected biological resources occur as a result of the project. 7145/San Dimas MCTA 20-0005 Page x
Biological Resources Evaluation Report Page 1267 – 2053 December 2022 ❖ INTRODUCTION ❖

1.0 INTRODUCTION
UltraSystems was retained by the City to conduct biological surveys and prepare this Biological Resources Evaluation (BRE) Report for the Municipal Code Text Amendment (MCTA) 20-0005. The project is located in the City of San Dimas, Los Angeles County, California (see Appendix A, Figures).

The City is proposing a MCTA 20-0005 of Title 18-Zoning, Chapter 18.518: Specific Plan 11 of the San Dimas Municipal Code (project), to amend grading limits within Specific Plan 11, Planning Area I (planning area) and to make various clean-up text amendments. The proposed MCTA would also include development standards for the grading, landscaping and any retaining walls that the additional grading would require. Additional text amendments include removing sections which dealt with the initial development of the area and codifying previous policies regarding Conditional Uses within the specific plan. The City is the Lead Agency for the purposes of the CEQA.

UltraSystems conducted a literature review and general surveys of the biological resources potentially associated with the planning area (approximately 105.5 acres), this area is referred to as the Biological Study Area (BSA). The BSA includes all areas that could potentially be directly or indirectly impacted by the proposed MCTA (see Appendix A, Figure 1, Project Boundary and Biological Study Area [BSA]), including residential lots.

Biological surveys covered all accessible areas of the BSA and did not extend beyond the BSA.

Biologists conducted the following biological surveys:
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Habitat assessment, vegetation community and land cover type mapping.

General plant surveys.

General wildlife surveys.
burrowing owl (BUOW) (Athene cunicularia) habitat assessment.

Wildlife movement evaluation.

Jurisdictional assessment of waters of the U.S. and State.

UltraSystems presents the results and conclusions of the biological surveys within this BRE.

1.1 BRE Purpose
This BRE documents the methods and results of the literature review, and field surveys, and provides a summary of existing conditions, an assessment of the potential presence of sensitive biological resources, and an analysis of the potential impacts to those resources from implementation of the project. It summarizes the biological resources present within the BSA at the time of the field surveys including vegetation communities, plants, and wildlife; and the potential occurrence of special-status plant and wildlife species, jurisdictional waters, critical habitat, and potential wildlife corridors within the BSA. Plant and wildlife species protected by federal agencies, state agencies, and local conservation agencies and organizations, such as the California Native Plant Society (CNPS), are collectively referred to as “special-status species” in this BRE. Some of these plant and wildlife species are afforded special legal or management protection because they are limited in population size, and typically have a limited geographic range and/or limited habitat (avian species protected by the Migratory Bird Treaty Act are not considered special-status species). The BRE also identifies and analyzes the potential biological significance of project implementation in view of federal, state, and local laws, regulations, policies, orders, ordinances and/or management plans, and the project’s consistency with local policies and ordinances protecting biological resources. Finally, it recommends, as appropriate, mitigation measures, including best management practices (BMPs), 7145/San Dimas MCTA 20-0005 Page 1-1
Biological Resources Evaluation Report Page 1268 – 2053 December 2022 ❖ INTRODUCTION ❖
avoidance and protection measures, and mitigation measures, to minimize or avoid potential impacts to biological resources to a less than significant level.

This BRE was prepared in support of the CEQA review conducted in connection with the project, as well as permits and approvals required for the project by federal and state resource agencies.

Figures for this BRE can be found in Appendix A, Figures. Since common names of plants and wildlife vary between references, scientific names are included upon initial mention of each species, and then the common names are used thereafter. Plant nomenclature within this BRE is based on CNPS’ Inventory of Rare and Endangered Plants of California (online; CNPS, 2022a) and The Jepson Manual:

Vascular Plants of California, second edition (Baldwin et al., 2012). Common plant names, when not available from this source, were taken from the CNPS website.

Disclaimer Regarding MCTA Biological Analyses: The avoidance, minimization, and compensatory mitigation measures provided in Section 7.0 Mitigation Measures are intended to comprehensively address the potential impacts to biological resources within SP-11 as an entire ecological unit, and per individual parcel, based on preliminary reconnaissance surveys for the purposes of the MCTA. The MCTA considered conceptual impact areas at the time of review and were not applicable to project-specific impacts, which are unknown at this time.

The biological constraints that may require avoidance, minimization, and compensatory mitigation include sensitive vegetation communities, special-status species (e.g., plants and wildlife), seasonal species protections (e.g., reproduction and overwintering), jurisdictional wetlands and waters, riparian drainage segments, protected trees, wildlife corridors, and land management designations.

A qualified biologist will perform focused biological surveys for construction approvals, based on 65 percent to 95 percent complete professional engineering drawings at the time of proposed development of each individual parcel. The biologist conducting the focused surveys will incorporate the focused survey results and those of the reconnaissance surveys (UltraSystems, 2022) to assign the relevant mitigation for each individual project. The City will require the mitigation in the construction specifications prior to issuance of grading plans approved for each individual land owner (or project applicant). The mitigation measures contained herein are legally binding and are required if impacts to protected biological resources occur as a result of the project.

1.2 Project Location
The planning area is located in the City of San Dimas, Los Angeles County, California (Appendix A, Figure 2, Regional Location). It is located in the San Jose Hills, generally bounded by Interstate 10 (I- 10) on the south, State Route 57 (SR-57) on the east, and Walnut Creek on the north and west (Appendix A, Figure 3, Project Vicinity and Figure 1 Project Location and Biological Study Area). The eastern San Gabriel Valley is north and west of the San Jose Hills, and the Pomona Valley is on the east. The BSA is located on the United States Geological Survey (USGS) 7.5-Minute Topographic Map San Dimas Quadrangle, and occupies Township 1 South, and Range 8 West, Sections 17 Southeast and 20 North (Appendix A, Figure 4, USGS Topographic Quadrangle Map). The existing surface elevation at the subject property ranges from approximately 680 to 960 feet above mean sea level (amsl).

The BSA is located within the USGS Big Dalton Wash Hydrologic Unit (HU; HU Code 180701060402) within the larger San Gabriel watershed (USGS HUC 18070106) The Big Dalton Wash HU drains an area of approximately 80.7 square miles (USEPA, 2022a). 7145/San Dimas MCTA 20-0005 Page 1-2
Biological Resources Evaluation Report Page 1269 – 2053 December 2022 ❖ INTRODUCTION ❖
Under existing conditions, stormwater generated on the undeveloped areas of the BSA either sheet flows down slopes and into the small canyons, where it ponds and infiltrates, or flows into drainage channels and discharges into the surrounding neighborhoods. Stormwater generated on most of the developed areas (residences, streets) flows down local streets and into storm drain inlets on Calle Cristina and Calle Francesca; this storm drain system runs south on Covina Hills Road to Via Verde where it turns east/northeast to Puente Street. The storm drain follows Puente Street to Walnut Creek, where it discharges.

The BSA is in Area I of the City of San Dimas Specific Plan 11, which is located within the southwestern portion of the City. Area is bordered by Puente Street to the north, Via Verde to the southeast, East Covina Hills Road to the southwest, and the City of Covina to the west.

The BSA comprises the western half of Area I (Specific Plan 11). The site is subdivided into 36 residential lots; 29 lots are developed with single-family residences, and seven lots are vacant. The project parcels are mapped on Appendix A, Figure 5, Parcel Map; the Assessor’s Parcel Numbers (APNs) of these 36 lots are presented below:
7145/San Dimas MCTA 20-0005 Page 1-3
Biological Resources Evaluation Report Page 1270 – 2053 December 2022 ❖ INTRODUCTION ❖
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844-800-8041
844-800-8042
844-800-8048
844-800-8044
844-800-8046
844-800-8055
844-800-8043
844-800-8045
844-800-8047
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•
844-803-8034
844-803-8036
844-803-8040
844-803-8033
844-803-8035
844-803-8037
844-803-8039
844-803-8046
844-803-8048
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•
844-803-8043
844-803-8044
844-8038041
844-803-8042
844-803-8049
844-803-8051
844-803-8053
844-803-8031
844-803-8038
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844-803-8045
844-803-8047
844-803-8054
844-803-8032
844-803-8055
844-803-8057
844-803-8050
844-803-8052
844-803-8056
According to the City of San Dimas Zoning Map and General Plan, the subject property is zoned “Single Family, Very Low”: density uses are very low-density single family detached and large estate developments (City of San Dimas, 1991).

The BSA is located in the southwestern portion of the City of San Dimas, County of Los Angeles, California. which is under the jurisdiction of the following resource agency field offices:
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United States Fish and Wildlife Service (USFWS): Carlsbad Fish and Wildlife Office 2177 Salk Avenue, Suite 250
Carlsbad, California 92008
Phone: (760) 431-9440
California Department of Fish and Wildlife (CDFW): South Coast Region (5) 3883 Ruffin Road
San Diego, California 92123
Phone: (858) 467-4201
Fax: (858) 467-4299
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United States Army Corps of Engineers (USACE): Los Angeles District 915 Wilshire Boulevard, Suite 980
Los Angeles, California 90017
Phone: (213) 452-3908/3333
Fax: (213) 452-4209
RWQCB: Los Angeles Region (4)
320 West Fourth Street, Suite 200
Los Angeles, California 91103
Phone: (213) 576-6600
Fax: (213) 576-6640
7145/San Dimas MCTA 20-0005 Page 1-1
Biological Resources Evaluation Report Page 1271 – 2053 December 2022 ❖ INTRODUCTION ❖

1.3 Project Background
The existing San Dimas Municipal Code Chapter 18.518: Specific Plan 11 allows for unlimited grading (cut and fill) for roadway access and excavation to construct building retaining foundations for the primary residence and garage. The Municipal Code also allows up to 35 percent of building lot coverage for the subject residential lots.
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The average lot size for SP-11, Planning Area 1 is 109,021 square feet (sf) (ranges between 30,371 sf to 932,170 sf).

The average existing 1st floor lot coverage is 6.5 percent (ranges between 0.81 percent to

14.69 percent).

The average additional first floor building area for the existing homes is 34,251 sf (ranges between 7,253 sf to 318,718 sf).

The estimated average available grading to accommodate the additional 1st floor building area is 21,500 cubic yards (cy) (ranges between 850 cy to over 200,000 cy). 7145/San Dimas MCTA 20-0005 Page 1-2
Biological Resources Evaluation Report Page 1272 – 2053 December 2022 ❖ PROJECT DESCRIPTION ❖

2.0 PROJECT DESCRIPTION
The project proposes to expand the allowable grading (cut and fill) on each of the 36 residential lots in the planning area by 1,000 cubic yards (cy) per lot, or a total of 36,000 cy. The increase in allowable grading is to permit owners to grade backyards. The current grading quantity permitted onsite is insufficient for grading backyards, and owners must use decks in the rear portions of their lots. The increase in allowable grading does not include what is necessary for the primary residence, driveway, and garage. The proposed increase in grading would not expand the allowable lot coverages of primary residences. Presently, grading for a swimming pool and decking is not allowed and thus also not included in the additional allowable grading calculations.

The current total grading quantity permitted for the primary residence, driveway, and garage on the 36 lots is approximately 774,000 cy (approximately 21,500 cy per lot); thus, the proposed increase is about 4.7 percent of the currently permitted grading quantity. Grading permitted under the existing approved Specific Plan is compared to the additional grading under the proposed MCTA 20- 0005 in Table 2.0-1 below.

Table 2.0-1

GRADING PERMITTED UNDER EXISTING SPECIFIC PLAN AND PROPOSED AMENDMENTS Existing Specific Plan Permitted
Grading
Proposed Additional
Grading
774,000 total cubic yards
average 21,500 cubic yards per lot
36,000 total cubic yards
1,000 cubic yards per lot
Grading for usable backyards;
currently decking is only
option for backyard use.

Additional grading is not for
primary residences, garages,
and driveways.

Grading quantity
Purposes
Mass grading; grading building pads
for primary residences, garages, and
driveways.

Sources: City of San Dimas, 2022. San Dimas, California Municipal Code Title 18 Zoning, Chapter 18.518 Specific Plan No. 11

2.1 Proposed Municipal Code Text Amendments
The proposed project includes the following amendments to San Dimas Municipal Code Chapter

18.518 Specific Plan No. 11 to preserve the original intent of the specific plan, minimize the visual impacts of potential grading and retaining walls, codify existing policies/practices and eliminate defunct sections of the code.

1. Requirements that proposed grading and retaining walls follow the existing topographic contours present onsite. The proposed grading cuts and/or retaining walls should not cut directly across contour lines.

2. A limitation of retaining walls to a maximum exposed height of twelve (12) feet per wall and a maximum combined exposed height of twenty-four (24) feet. This language is consistent with existing retaining wall height limit standards used in other hillside areas. 7145/San Dimas MCTA 20-0005 Page 2-1
Biological Resources Evaluation Report Page 1273 – 2053 December 2022 ❖ PROJECT DESCRIPTION ❖

3. A requirement that if more than one retaining wall will be constructed directly adjacent to one another, the two walls must be separated by half (1/2) the height of the taller of the two adjacent walls.

4. Requirements to use gravity type retaining walls, unless onsite conditions prohibit their use.

5. Wall materials which must be either slump stone or split-face stone with a tan or earth tone color.

Landscape and irrigation standards which require the planting of trees at the base of the lowest retaining wall and drought tolerant shrubs at the base of every wall. Installation of permanent irrigation shall be required to ensure that the required landscaping survives and is healthy enough to provide screening.

2.2 Project Operation
Project implementation would not change operation of existing and future residences onsite. Land use of the planning area would not change.
7145/San Dimas MCTA 20-0005 Page 2-2
Biological Resources Evaluation Report Page 1274 – 2053 December 2022 ❖ REGULATORY CONTEXT ❖

3.0 REGULATORY CONTEXT
The project is subject to several federal, state, and local regulations designed to protect and promote environmental quality, and to protect biological resources because of their ecological importance.

These regulations are summarized below and are addressed throughout the document in the appropriate subsections.

3.1 Federal Statues, Regulations and Executive Orders

3.1.1 Clean Water Act (CWA)
Section 401 – Clean Water Act
Although the Clean Water Act (CWA) is a federal law, Section 401 of that law recognizes that states have the primary authority and responsibility for setting surface water quality standards, and requires the U.S. Army Corps of Engineers to obtain a state certification that their permits for discharge or dredge and fill material do not violate state water quality standards. Section 401 of the CWA requires every applicant for a Section 404 permit resulting in any discharge of dredge or fill material into Waters of the U.S. to provide a certification that any discharges will comply with the applicable state water quality standards set pursuant to the CWA and applicable state law.

Section 401 is implemented through a Water Quality Certification (WQC) process. In the State of California, the State Water Resources Control Board (SWRCB) has given the responsibility for issuing Section 401 WQCs to the RWQCBs, unless a discharge of dredged or fill material is proposed within more than one region. In the event that a project proposes discharges of dredged or fill material in more than one region, responsibility for issuance of a Section 401 WQC will lie either with the SWRCB, or, upon agreement of the RWQCBs for the affected regions, with the RWQCB chosen in the discretion of the RWQCBs. Cal. Water Code, § 13160; Cal. Code Regs., tit. 23, § 3838. Certification must be based on a finding that the proposed discharge will comply with water quality standards, which include numeric and narrative water quality objectives applicable to identified surface waters in the Water Quality Control Plan (Basin Plan) for the region in which a discharge of fill is proposed. The project would be under the jurisdiction of the Los Angeles RWQCB.

Section 402 Clean Water Act
Pursuant to Section 402(p) CWA, storm water permits are required for discharges from a municipal separate storm sewer system (MS4) serving a population of 100,000 or more. The State Water Resources Control Board (SWRCB) and Regional Water Quality Control Boards (RWQCBs) have been authorized by the U.S. Environmental Protection Agency (USEPA) to implement and enforce the Municipal Storm Water Program (USEPA, 2022b).

In the County of Los Angeles, Order No. R4-2012-0175 as amended by State Water Board Order WQ 2015-0075 and Los Angeles Water Board Order R4-2012-0175-A01 NPDES Permit No. CAS004001 Waste Discharge Requirements for Municipal Separate Storm Sewer System (MS4) Discharges within the Coastal Watersheds of Los Angeles County, Except Those Discharges Originating from the City of Long Beach MS4 (MS4 Permit) is currently in effect; the city of San Dimas is a signatory to this permit, and is subject to the waste discharge requirements set forth in this Order.

Section VI(D)(8) of the MS4 Permit applies exclusively to construction sites with construction activities involving soil disturbance with the exception of agricultural activities. Activities covered by 7145/San Dimas MCTA 20-0005 Page 3-1
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this permit include but are not limited to grading, vegetation clearing, soil compaction, paving, repaving and linear underground/overhead projects. The City of San Dimas, as signatory to the MS4 permit, shall, though their erosion and sediment control ordinance and/or building permit, require the implementation of an effective combination of erosion and sediment control BMPs to prevent erosion and sediment loss, and the discharge of construction wastes.

Section 404 – Clean Water Act
• Section 404 CWA requires authorization from the Secretary of the Army, acting through the U.S. Army Corps of Engineers (USACE), for the discharge of dredged or fill material into all waters of the United States, including wetlands. Authorizations are conducted through the issuance of Nationwide (or General) Permits, for activities that would cause only minimal permanent individual (between 0.1 and 0.5 acre) and cumulative impacts; through Individual (or Standard) Permits for activities that are likely to have more than a minimal permanent (greater than 0.5 acre) or cumulative impact on aquatic resources; and through Letters of Permission (LOPs) which are a type of individual permit issued through an abbreviated process that includes coordination with federal and state fish and wildlife agencies and a public interest evaluation, but without the 30-day permit notice period that is required for Individual Permits. The project would be under the jurisdiction of the Los Angeles District of the USACE.
• Wetlands and other waters that do not meet the definition of waters of the U.S. are not covered by the CWA; however, they are regulated by the State of California through the Porter-Cologne Water Quality Control Act (Porter-Cologne) and SWRCB Resolution No. 2019-0015 for California.

3.1.2 Endangered Species Act (ESA)
The federal Endangered Species Act of 1973 (Title 16, United States Code [U.S.C.] Sections 1531- 1543) (ESA), as amended, designates and provides for protection of listed threatened and endangered plant and animal species, and their critical habitat. The USFWS, in the Department of the Interior, and the National Oceanic and Atmospheric Administration’s National Marine Fisheries Service (NMFS), in the Department of Commerce, share responsibility for administration of the ESA.

These responsibilities include listing and delisting species, designating critical habitat, and formulating recovery plans. The USFWS has primary responsibility for terrestrial and freshwater organisms, while the responsibilities of NMFS are mainly marine wildlife.

The ESA is divided into 18 Sections that are intended to work together to prevent species from going extinct by helping to stabilize populations, reduce the threats to their survival, and helping species recover to the point that they no longer require federal protection (USFWS, 2022a; b).

Section 4 (Determination of Endangered Species and Threatened Species) Section 4 of the ESA addresses listing of species in need of the ESA’s protection. Species are listed as either endangered or threatened under Section 4 of the ESA. A federally-endangered species is one that is facing extinction throughout all or a significant portion of its range. A federally-threatened species is one likely to become endangered within the foreseeable future throughout all or a significant portion of its range. Under Section 4, actions needed to recover those species and conserve their habitat are also identified, along with a process for reaching recovery goals that allow for a species’ removal from federal protection. The presence on a BSA of any fish or wildlife species that is federally listed as endangered or threatened generally imposes constraints on development to the 7145/San Dimas MCTA 20-0005 Page 3-2
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extent that development is likely to result in a prohibited “take” of the species or substantial adverse modification of its habitat as described in Section 9 (Prohibited Acts), below.

Section 7 (Interagency Cooperation)
Two sections of the ESA (§7 and § 10) authorize incidental take. Section 7 of the ESA regulates take associated with federal projects or projects that require a federal permit. It also requires federal agencies to use their authority to carry out conservation programs to benefit endangered and threatened species. Under § 7, federal agencies are required to consult with the USFWS or the NMFS to ensure that any action they carry out, including those they fund or authorize (such as through a permit) will not likely jeopardize the continued existence of listed species, or result in the destruction or adverse modification of proposed or designated critical habitat of such species. Under § 7, consultations can either be informal or formal.

Section 9 (Prohibited Acts)
Once a species is listed, Section 9 of the ESA makes it unlawful for any person, including private and public entities, to “take species listed as endangered or without a permit issued pursuant to Section 10 or an incidental take statement issued pursuant to Section 7. Section 9 defines “take” as “to harass, harm, pursue, hunt, shoot, wound, kill, trap, capture, or collect or attempt to engage in any such conduct.” The term “harm” is defined as “an act which actually kills or injures wildlife. Such an act may include substantial habitat modification or degradation where it actually kills or injures wildlife by significantly impairing essential behavioral patterns, including breeding, feeding, or sheltering.” ESA Section 9s take prohibitions apply to listed wildlife and fish species, but not to plants.

Endangered plants are not protected from take, although it is unlawful to remove, possess, or maliciously damage or destroy them on federal lands. Removing or damaging listed plants on state and private lands in knowing violation of state law, or in the course of violating a state criminal trespass law, also is illegal under the ESA.

Section 10 (Incidental Take Permits and Habitat Conservation Plans) An incidental take permit pursuant to Section 10(a)(1)(B) is required when non-Federal, otherwise lawful activities, including lawful project development, will result in take of threatened or endangered wildlife. Under this provision, the USFWS and/or NMFS may, where appropriate, authorize the taking of federally listed wildlife or fish if such taking occurs incidentally during otherwise legal activities. Section 10(a)(2)(B) requires an application for an incidental take permit to include an HCP. The purpose of the habitat conservation planning process associated with the permit is to ensure there is adequate avoidance, minimization and mitigation measures to address the effects of the authorized incidental take. Section 10 provides a clear regulatory mechanism to permit the incidental take of federally listed fish and wildlife species by private interests and nonFederal governmental agencies.

3.1.3 Migratory Bird Treaty Act (MBTA)
The Migratory Bird Treaty Act (MBTA) of 1918 (Title 16, U.S.C. Sections 703 - 712), as amended, implements various treaties and conventions between the United States (U.S.) and Canada, Japan, Mexico and the former Soviet Union for the protection of migratory birds. The MBTA makes it unlawful to pursue, hunt, take, capture, kill, possess, sell, purchase, barter, import, export, or transport any migratory bird, or any part, nest, or egg or any such bird, unless authorized under a 7145/San Dimas MCTA 20-0005 Page 3-3
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permit issued by the Secretary of the Interior. Some regulatory exceptions apply. Take is defined in regulations implementing the MBTA as “to pursue, hunt, shoot, wound, kill, trap, capture, or collect, or attempt to carry out these activities.” The MBTA prohibits the collection and destruction of a migratory bird, its nest, and birds or eggs contained in the nest. The USFWS’ Migratory Bird Permit Memorandum (MBPM-2) dated April 15, 2003, clarifies that destruction of most unoccupied bird nests is permissible under the MBTA; exceptions include nests of federally listed threatened or endangered migratory birds, bald eagles, and golden eagles. Take under the MBTA does not include habitat destruction or alteration, as long as there is not a direct taking of birds, nests, eggs, or parts thereof. The USFWS has statutory authority and responsibility for enforcing the MBTA (USFWS, 2022c).

3.1.4 National Environmental Policy Act (NEPA)
The National Environmental Policy Act (NEPA) of 1969 (42 U.S.C. §§ 4321) requires federal agencies carrying out, funding, or permitting projects, or implementing any other major federal action that significantly adversely affects the quality of the human environment to prepare a detailed environmental impact analysis for the major Federal action. The analysis, known as the Environmental Impact Statement or an Environmental Assessment, must address the adverse environmental impacts of the proposed action, any adverse environmental effects which cannot be avoided should the proposal be implemented, alternatives to the proposed action, the relationship between local short-term uses of man’s environment and the maintenance and enhancement of longterm productivity, and any irreversible and irretrievable commitments of resources which would be involved in the proposed action should it be implemented. The Council on Environmental Quality (CEQ) has promulgated regulations for implementing NEPA’s requirements. (40 C.F.R. §§ 1502 et seq.) Pursuant to state and federal law, NEPA evaluations may be prepared in combination with, or may rely upon environmental analyses prepared under the California Environmental Quality Act 40 C.F.R. §§ 1506.2, 1506.4.

3.1.5 Prevention and Control of Invasive Species - Executive Order 13112 Executive Order 13112 (February 3, 1999) directs all federal agencies to work cooperatively to prevent and control the introduction of invasive non-native species in a cost-effective and environmentally sound manner to minimize their economic, ecological, and human health impacts.

Executive Order 11312 established a national Invasive Species Council made up of federal agencies and departments and a supporting Invasive Species Advisory Committee composed of state, local, and private entities. The Invasive Species Council and Advisory Committee oversee and facilitate implementation of the Executive Order, including preparation of a National Invasive Species Management Plan.

3.2 State Statutes and Regulations

3.2.1 California Environmental Quality Act (CEQA)
The California Environmental Quality Act of 1970 (Title 14, California Code of Regulations, §§ 15002- 15387) (CEQA) is California's broadest environmental law (AEP, 2022). CEQA applies to certain activities of state and local public agencies. It requires lead agencies - that is, those making land use decisions – as well as any other responsible state agencies issuing discretionary permits, to evaluate and disclose the significance of all potential environmental impacts of a project. The lead agency is also responsible for identifying, negotiating and implementing feasible impact avoidance, minimization, or mitigation measures that reduce and compensate for significant environmental 7145/San Dimas MCTA 20-0005 Page 3-4
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impacts with the goal of reducing those impacts to less than significant levels. Lead agencies determine significance on a project-by-project basis because they must consider all potential risk, including cumulative impacts, within a local and regional context, as well as evaluate unique factors particular to the planning area when exercising their discretion to approve or disapprove a project.

The CEQA Guidelines specify that a project has a significant impact to the environment if, among other things, it has the potential to “substantially degrade the quality of the environment; substantially reduce the habitat of a fish or wildlife species; cause a fish or wildlife population to drop below self-sustaining levels; threaten to eliminate a plant or an animal community; substantially reduce the number or restrict the range of an endangered, rare or threatened species….” [CEQA Guidelines § 15065(a)(1)] (AEP, 2022).

The purpose of CEQA is to:
• Disclose to the public the significant environmental impacts of a proposed discretionary project, through the preparation of an Initial Study, Negative Declaration, or Environmental Impact Report.
•
•
•
•
Prevent or minimize damage to the environment through development of project alternatives, mitigation measures, and mitigation monitoring.

Disclose to the public the agency decision making process utilized to approve discretionary projects through findings and statements of overriding consideration.

Enhance public participation in the environmental review process through scoping meetings, public notice, public review, hearings, and the judicial process.

Improve interagency coordination through early consultations, scoping meetings, notices of preparation, and State Clearinghouse review.

3.2.2 California Endangered Species Act (CESA)
The California Endangered Species Act (CESA) (California Fish and Game Code §§ 2050-2089) was enacted in 1984 to parallel the federal ESA and allows the Fish and Game Commission to designate species, including plants, as “threatened” or “endangered” CESA states that all native species of fishes, amphibians, reptiles, birds, mammals, and plants, and their habitat, threatened with extinction and those experiencing a significant decline which, if not halted, would lead to a threatened or endangered designation, will be protected or preserved. Unlike the ESA, CESA does not include listing provisions for invertebrate species.

CESA makes it illegal to import, export, take, possess, purchase, sell, or attempt to do any of those actions to species that are designated as threatened, endangered, or candidates for listing, unless permitted by CDFW. Section 2080 of the California Fish and Game Code prohibits take of any species that the Commission determines to be an endangered species or a threatened species. “Take” is defined in Section 86 of the California Fish and Game Code as "hunt, pursue, catch, capture, or kill, or attempt to hunt, pursue, catch, capture, or kill."
Under Section 2081 of CESA, CDFW may permit take or possession of threatened, endangered, or candidate species for scientific, educational, or management purposes, and may also permit take of these species that is incidental to otherwise lawful activities if certain conditions are met. Some of 7145/San Dimas MCTA 20-0005 Page 3-5
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the conditions for issuance of permits allowing incidental take are that the adverse effects of the take must be minimized and fully mitigated, adequate funding must be ensured for implementation of identified mitigation, and that the activity shall not jeopardize the continued existence of the listed species. CESA emphasizes early consultation to avoid potential impacts to candidate and listed endangered and threatened species, and to develop appropriate mitigation to offset project caused losses of listed species populations and their essential habitat.

3.2.3 Fully Protected Species - California Fish and Game Code § 3511, § 4700, § 5050 and § 5515
The classification of fully protected was the State of California’s initial effort in the 1960s to identify and provide additional protection to those animals that were rare or faced possible extinction. Lists were created for birds (§ 3511), mammals (§ 4700), amphibians and reptiles (§ 5050), and fish (§ 5515). Fully protected animal species may not be taken or possessed at any time and no licenses or permits may be issued for their take, except for collecting these species for scientific research and relocation of the species for certain purposes. “Take” is defined in Section 86 of the California Fish and Game Code as "hunt, pursue, catch, capture, or kill, or attempt to hunt, pursue, catch, capture, or kill." Under Section 2835 of the Fish and Game Code, CDFW may only issue permits allowing incidental take of fully protected species if a NCCP is prepared that provides for the protection of that species in accordance with the requirements and standards applicable to NCCPs (Fish and Game Code Sections 2800-2835). Alternatively, avoidance measures sufficient to prevent incidental take of fully protected species must be incorporated into project design, and construction plans and operations.

3.2.4 Bird Nests and Eggs - California Fish and Game Code § 3503 California Fish and Game Code § 3503 states that it is unlawful to take, possess, or needlessly destroy the nest or eggs of any bird, except as otherwise provided by this code or any regulation made pursuant thereto. Disturbance that causes nest abandonment and/or loss of reproductive effort (e.g., killing or abandonment of eggs or young) may be considered take. Avoidance measures sufficient to prevent incidental take of bird nests and eggs protected by this statute must be incorporated into project design, and construction plans and operations.

Birds of Prey and their Eggs – California Fish and Game Code § 3503.5 The word "raptor" is the term used for a group of birds consisting of hawks, falcons, kites, eagles, vultures and owls. Raptors, also referred to as "birds of prey," are a valuable resource to the State of California. More than 30 species of raptors inhabit California at some point in their life cycle.

California Fish and Game Code § 3503.5 makes it unlawful to take, possess, or destroy any birds in the orders Falconiformes or Strigiformes (raptors) or to take, possess, or destroy the nest or eggs of any such birds except as otherwise provided by this code or any regulation adopted pursuant thereto.

The order Falconiformes is comprised of four families with around 311 species. These are the birds of prey (falcons, hawks, eagles, vultures, and ospreys). The order Strigiformes, comprised solely of owls, contains two families and over 130 species. All raptors and their nests are protected under § 3503.5. Avoidance measures sufficient to prevent incidental take of these species, their eggs and their nests protected by this statute must be incorporated into project design, and construction plans and operations.
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Migratory Birds – California Fish and Game Code § 3513
California Fish and Game Code § 3513 protects California’s migratory birds by making it unlawful to take or possess any migratory non-game bird as designated by the MBTA, except as authorized in regulations adopted by the federal government under provisions of the MBTA. Except as permitted by USFWS, avoidance measures sufficient to prevent incidental take of these species, their eggs and their nests protected by this statute must be incorporated into project design, and construction plans and operations

3.2.5 Native Plant Protection Act (NPPA) – California Fish and Game Code §§ 1900-1913 The Native Plant Protection Act (NPPA), enacted in 1977, allows the Fish and Game Commission to designate native plants as state “endangered” or “rare,” mirroring the designations created for animal species by the CESA of 1970. The NPPA, administered by CDFW, requires all state agencies to utilize their authority to preserve, protect and enhance endangered or rare native plants of California.

Section 1908 of the NPPA prohibits the take, possession, propagation, import, export, or sale of any native plant that the Fish and Game Commission determines to be an endangered or rare native plant, except when the take is incidental to agricultural and nursery operations, emergencies, or the possession or sale of real property on which the plant is growing.

CDFW may authorize the take, possession, import, or export of some plants that are protected by the NPPA. It may also authorize take and possession for scientific, educational or management purposes, or authorize take that is incidental to otherwise lawful activities if certain conditions are met. CDFW issues most of these permits to individuals to identify, document and voucher listed plant species, typically during botanical surveys, and may also issue permits to individuals or organizations for other scientific, educational or management purposes, most typically research or recovery actions for state-listed plant species. Section 1913(c) further provides that where the owner of land has been notified by CDFW that native plant listed as rare or endangered is growing on such land, the owner shall notify CDFW at least 10 days in advance of changing the land use to allow for salvage of the listed plant(s) subject to the notification. The failure by CDFW to salvage such plant within 10 days of notification of change in land use shall entitle the owner of the land to proceed with the change.

3.2.6 Construction General Permit; Order 2009-0009-DWQ
If a project will disturb one or more acres of soil during construction, project owners are required by the California State Water Resources Control Board (SWRCB) to obtain coverage under a General Permit for Discharges of Storm Water Associated with Construction Activity (Construction General Permit Order 2009 0009 DWQ, as authorized by § 402 CWA, [NPDES permit]). The Construction General Permit requires potential dischargers of pollutants into waters of the U.S. to prepare a sitespecific Stormwater Pollution Prevention Plan (SWPPP), which establishes enforceable limits on discharges, requires effluent monitoring, designates reporting requirements, and requires construction best management practices (BMPs) to reduce or eliminate point and non-point source discharges of pollutants. Additionally, BMPs must be maintained, inspected before and after each precipitation event, and repaired or replaced as necessary. The SWRCB authorizes Construction General Permits.

For projects that would disturb less than one acre of soil, applicants for grading permits pursuant to the proposed MCTA would be required to comply with the Waste Discharge Requirements for Municipal Separate Storm Sewer System (MS4) Discharges within the Coastal Watersheds of Los Angeles County (except those discharges originating from the City of Long Beach MS4), Order No. R4- 7145/San Dimas MCTA 20-0005 Page 3-7
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2012-0175 as amended by State Water Board Order WQ 2015-0075 and Los Angeles Water Board Order R4-2012-0175-A01 NPDES Permit No. CAS004001 (referred to as the MS4 Permit), to which the City of San Dimas is a Permittee. The MS4 Permit applies to the discharge of pollutants from anthropogenic sources into waters of the U.S. through stormwater and urban runoff conveyance systems, including flood control facilities (e.g., storm drains) Section IV(D)(8)(d)(1) of the MS4 applies to construction sites of less than one acre, and requires the implementation of an effective combination of erosion and sediment control BMPs to prevent erosion and sediment loss. Sections IV(D)(8)(e ) and IV(D)(8)(f) of the MS4 require operators of public and private construction sites within its jurisdiction to select, install, implement, and maintain BMPs that comply with its erosion and sediment control ordinance, and state that the requirements contained in this part apply to all activities involving soil disturbance with the exception of agricultural activities.

Activities covered by this permit include but are not limited to grading, vegetation clearing, soil compaction, paving, re-paving and linear underground/overhead projects. Grading projects of less than one acre would, with compliance with the Los Angeles County MS4 Permit, minimize or avoid potential violations of water quality standards or waste discharge requirements, and would not substantially degrade surface or groundwater quality.

Applicants for grading permits pursuant to the proposed MCTA would be required to comply with § IV(D)(8)(d) of the MS4 Permit, which requires construction best management practices (BMPs) to reduce or eliminate point and non-point source discharges of pollutants, including sediment.

3.2.7 Porter-Cologne Water Quality Control Act
Porter-Cologne defines water quality objectives as the allowable “limits or levels of water quality constituents or characteristics which are established for the reasonable protection of beneficial uses of water or the prevention of nuisances within a specific area.” Thus, water quality objectives are intended to protect the public health and welfare, and to maintain or enhance water quality in relation to the existing and/or potential beneficial uses of the water. Water quality objectives apply to both waters of the U.S. and waters of the State. In the State of California, Porter-Cologne is administered in concurrence with the § 401 CWA WQC. As with § 401 CWA, this project is within the jurisdiction of the Los Angeles RWQCB.

3.2.8 State Water Resources Control Board Resolution No. 2019-0015 The California Code of Regulations, Title 23, Section 3831(w) states that “[a]ll waters of the United States are also ‘waters of the state.’” This regulation has remained in effect despite Supreme Court decisions such as Rapanos and SWANCC, which added limitations to what could be considered a water of the U.S. Because the interpretation of waters of the U.S. in place at the time § 3831(w) was adopted was broader than any post-Rapanos or post-SWANCC regulatory definitions that incorporated more limitations into the scope of federal jurisdiction, it is consistent with the Water Boards’ intent to include both historic and current definitions of waters of the U.S. into the SWRCBs wetland jurisdictional framework.

As set forth in Resolution No. 2009-0026, although the state of California has historically relied primarily on requirements in the Clean Water Act to protect wetlands, U.S. Supreme Court rulings reducing the jurisdiction of the Clean Water Act over wetland areas by limiting the definition of “waters of the United States” necessitated the use of California’s independent authorities under Porter-Cologne to protect these vital resources.
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The inclusion of both current and historic definitions of “waters of the U.S.” ensures some regulatory stability in an area that has otherwise been in flux. The status of a water of the U. S. may only be used to establish that a wetland or water qualifies as a water of the State; it cannot be used to exclude a wetland or water from qualifying as a water of the State. In other words, wetlands that are categorically excluded from qualifying as a water of the U.S. may nevertheless qualify as waters of the State under another jurisdictional category. Examples of waters of the State include (but are not limited to) ephemeral streams and isolated wetlands.

On April 2, 2019, the SWRCB adopted Resolution No. 2019-0015, Amendment to the Water Quality Control Plan for Ocean Waters of California and the Water Quality Control Plan for Inland Surface Waters, Enclosed Bays, and Estuaries of California to Establish a State Wetland Definition and Procedures for Discharges of Discharges of Dredged or Fill Material to Waters of the State (Procedures). for inclusion in the forthcoming Water Quality Control Plan for Inland Surface Waters and Enclosed Bays and Estuaries and Ocean Waters of California (SWRCB, 2019). As they apply to this project, the Procedures provide the SWRCB and its nine RWQCBs to approve a project only if the applicant has demonstrated the following:
• A sequence of actions has been taken to first avoid, then to minimize, and lastly, compensate for adverse impacts that cannot be practicably avoided or minimized to waters of the state; • The potential impacts will not contribute to a net loss of the overall abundance, diversity, and condition of aquatic resources in a watershed (or multiple watersheds when compensatory mitigation is permitted in another watershed);
•
•
The discharge of dredged or fill material will not violate water quality standards and will be consistent with all applicable water quality control plans and policies for water quality control; and
The discharge of dredged or fill material will not cause or contribute to significant degradation of the waters of the state.

On January 26, 2021, the Superior Court in San Joaquin Tributaries Authority v. California State Water Resources Control Board issued a judgment upholding the adoption of the Procedures as part of the (1) California Ocean Plan and (2) Inland Surface Waters and Enclosed Bays and Estuaries Water Quality Control Plan (ISWEBE Plan) for “waters of the United States” as defined by the Clean Water Act.

On April 6, 2021, the SWRCB issued Resolution No. 2021-0012 confirming that the “State Wetland Definition and Procedures for Discharges of Dredged or Fill Material to Waters of the State” (1) are in effect as state policy for water quality control for all waters of the State and (2) shall be applied via the inland surface waters and enclosed bays and estuaries plan to only waters of the United States. (SWRCB, 2021)
The SWRCB and its nine RWQCBs have the authority to regulate the discharge of dredged or fill material under § 401 CWA and Porter-Cologne. Dischargers that obtain a federal permit or license that authorizes impacts to waters of the U.S. (i.e., waters that are within federal jurisdiction), such as § 404 CWA and § 10 of the Safe Rivers and Harbors Act, must obtain certification from the SWRCB or a RWQCB to ensure that the discharge does not violate state water quality standards or any other appropriate requirement of State law. When a discharge is proposed to waters outside of federal jurisdiction, the SWRCB and the RWQCBs regulate the discharge under Porter-Cologne through the 7145/San Dimas MCTA 20-0005 Page 3-9
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issuance of Waste Discharge Requirements (WDRs). CWA § 401 WQCs, WDRs, and waivers of WDRs are referred to as orders or permits.

This project is within the jurisdiction of the Los Angeles RWQCB.

3.2.9 Basin Plans
The SWRCB requires its nine RWQCBs to develop water quality control plans (Basin Plans) designed to preserve and enhance water quality and protect the beneficial uses of all Regional waters.

Specifically, Basin Plans designate beneficial uses for surface waters and groundwater, set narrative and numerical objectives that must be attained or maintained to protect the designated beneficial uses and conform to the State antidegradation policy, and describe implementation programs to protect all waters in the Regions. In addition, Basin Plans incorporate by reference all applicable State and Regional Board plans and policies, and other pertinent water quality policies and regulations.

This Basin Plan for the Coastal Watersheds of Los Angeles and Ventura Counties applies to this project.

3.2.10 Lake or Streambed Alteration Agreement
Sections 1600-1617 FGC of the FGC protect the natural flow and the bed, channel, and bank of any river, stream, or lake designated by the CDFW which is at any time an existing fish or wildlife resource, or a waterbody from which these resources derive benefit. General project plans must be submitted to CDWF in sufficient detail to indicate the nature of the project proposed for construction, if the project would:
•
•
•
Divert, obstruct, or change a streambed;
Use material from the streambeds;
Result in the disposal or deposition of debris, waste, or other material containing crumbled, flaked, or ground pavement where it can pass into a stream.

The project is within the jurisdiction of the South Coast Region of CDFW.

3.2.11 Natural Community Conservation Planning Act of 2003 (NCCP Act) The California Natural Community Conservation Planning Act (NCCP Act) was enacted to encourage broad-based planning to provide for effective protection and conservation of the State’s wildlife resources while continuing to allow appropriate development and growth (California Fish and Game Code §§ 2800 to 2835). NCCPs may be implemented, which identify measures necessary to conserve and manage natural biological diversity within the planning area, while allowing compatible and appropriate economic development, growth, and other human uses. An approved NCCP enables the California Department of Fish and Wildlife to authorize take of species consistent with the NCCP Act and California Fish and Game Code § 2835.

3.3 Regional and Local Ordinances, Plans and Policies

3.3.1 Significant Ecological Areas
Then Los Angeles County Significant Ecological Area (SEA) Program was originally established as a part of the 1980 County General Plan, to help conserve the genetic and physical diversity within Los Angeles County by designating biological resource areas capable of sustaining themselves into the 7145/San Dimas MCTA 20-0005 Page 3-10
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future. The General Plan 2035 (“General Plan”) updated the SEA boundary map, goals and policies in 2015.

SEAs are places where the County deems it important to facilitate a balance between development and biological resource conservation. Where occurring within SEAs, development activities are carefully guided and reviewed with a key focus on site design as a means for conserving fragile resources such as streams, woodlands, and threatened or endangered species and their habitats.

The SEA Ordinance (Title 22 Planning and Zoning Code) implements the goals and policies of the General Plan by establishing permitting requirements, design standards, and review processes for development within SEAs. The goal of the SEA Ordinance is to guide development to the least impactful areas on a property in order to avoid adverse impacts to biological resources (LACRP 2019, pp. 6-7).

3.3.2 Chapter 18.162 Tree Preservation
Chapter 18.162 Tree Preservation Ordinance (hereafter, Tree Preservation Ordinance) of the San Dimas Municipal Code states the goal of protecting and preserving mature significant trees, as well as “other trees which are determined to be desirable”. The Tree Preservation Ordinance defines a mature significant tree as follows:
” any tree within the city of an oak genus which measures eight inches or more in trunk diameter, and/or any other species of tree that measures ten inches or more in trunk diameter, and/or any multi-trunk tree(s) having a total circumference of thirty-eight inches or more; the multitrunk tree shall include at least one trunk with a diameter of a minimum of four inches”.

The Tree Preservation Ordinance requires that the trunk diameter must be measured at a point thirty-six inches above the ground at the base of the tree. The ordinance also requires that no significant trees shall be removed or relocated on an undeveloped property without first submitting an arborist report and obtaining a tree removal permit from the city’s Development Services, Planning Division.

Removal or relocation of mature significant trees must be approved by the director of development services or the development plan review board. Section 18.162.020 defines removal to include:
• Any act which will cause a mature significant tree to die, including but not limited to acts which inflict damage upon the root system or other parts of the tree by fire, cutting, application of toxic substances, operation of equipment or machinery, or by changing the natural grade of land by excavation or filling the drip line area around the trunk.

This approval is subject to conditions as deemed necessary to implement this chapter’s provisions.

Section 18.162.060 Conditions Imposed of the Tree Preservation Ordinance establishes the following as conditions of approval for tree relocation or removal:
• Tree relocation and/or two for one replacement with minimum fifteen-gallon box tree(s), or other replacement of equivalent value and size, within the subject property. The two for one replacement ratio may be reduced as determined by the final decision making body, if a minimum of one of the following additional findings are made: (1) The reduced replacement requirement is consistent with the purposes of this chapter, (2) the tree(s) in question are located where the impact of the tree removal on the community is limited (such as trees in a 7145/San Dimas MCTA 20-0005 Page 3-11
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generally flat portion of the rear yard of a single-family house that are deemed to have less public benefit).;
•
•
When on-site features, project constraints, and/or other considerations exist which prevent reasonable on-site relocation, relocation to an approved off-site location shall be permitted; If said conditions are imposed, the owner will be responsible for all replacement and relocated trees for a minimum period of two years. If during this time the tree(s) is (are) declared unhealthy by a certified arborist as set forth in Section 18.162.090, the diseased trees shall be removed and replaced at the cost of the applicant, as set forth in Section 18.162.100 • A maintenance agreement shall be submitted by the applicant and established for each replaced and relocated tree. The maintenance agreement and maintenance responsibility shall be transferred with the sale of the property if title to the property is transferred within the specified maintenance period. (Ord. 1165 § 4, 2006)”
In addition, the Tree Preservation Ordinance states in Section 18.162.080 states that All trees should be protected, but provides a list of exceptions to the Ordinance. 7145/San Dimas MCTA 20-0005 Page 3-12
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4.0 STUDY METHODS
This Section describes the study methods used by biologists for evaluating the biological resources within the BSA and the project vicinity.

4.1 Literature Review and Findings
Prior to field surveys, biologists conducted a literature review to identify habitat, special-status plant and wildlife species, potential jurisdictional areas (i.e., waters of the U.S. and State), critical habitat, and wildlife movement corridors potentially associated with the BSA. Biologists reviewed relevant literature, databases, agency web sites, reports and management plans, Geographic Information System (GIS) data, maps, and aerial imagery obtained from public domain sources. The review also helped to determine which biological surveys may be required prior to site construction and development.

4.1.1 Topography and Physical Features
To gain a perspective of the topographic and physical features associated with the BSA and project vicinity, biologists reviewed maps such as the USGS 7.5-Minute Topographic Map San Dimas Quadrangle and current aerial imagery (Google Earth Pro, 2022). Information obtained from this review included onsite and offsite locations of city and county boundaries and jurisdictions; valleys, hills, and mountain ranges; park boundaries; natural and man-made drainages, potential wetlands, and open waters (lakes, ponds, etc.); plant community boundaries; land use such as developed land and natural open space; important landmarks; roads, highways, paths, and trails; and potential wildlife movement corridors.

4.1.2 Soils
The Web Soil Survey, operated by the United States Department of Agriculture’s (USDA’s) Natural Resources Conservation Service (NRCS), was used to create a custom soil resource report for a description of the soils associated with the BSA (Soil Survey Staff, 2022). The Web Soil Survey provides soil data and information produced by the National Cooperative Soil Survey.

The NRCS soil survey for Los Angeles County, California, Southeastern Part has mapped three soil unit types within the BSA (see Appendix A, Figure 6, USDA Soils), which are presented in Section 5.1.3.

4.1.3 Sensitive Vegetation Communities and Special-Status Plant and Wildlife Species The methods described below were used to research and derive a comprehensive project-specific list of sensitive habitats, and special-status plants and wildlife to target during the field surveys. The literature review and query of the databases for reported locations of special-status species and habitat helped to identify the known locations of these resources in the project region and assisted in identifying the potential for onsite occurrence of such species. • CDFW’s California Natural Diversity Database (CNDDB) was used to identify sensitive vegetation communities and special-status plant and wildlife species that may exist within the BSA and within a ten-mile radius of the site (CNDDB, 2022a). • The USFWS’ Information, Planning, and Conservation (IPaC) system was used to identify federal threatened and endangered plant and wildlife species and other natural resources of concern that may exist within the BSA (USFWS, 2022d).
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• Previous consultant studies and reports near the BSA and project vicinity were reviewed to gain a sense of the existing conditions at the time the studies were conducted.

Although the inventory list of special-status plant and wildlife species was not exhaustive of all species that might be of concern for the property, it provided a wide range of species that are representative of the habitat in the area. Special-status plant species that have been recorded within two miles of the BSA are shown in Figure 7, CNDDB Known Occurrences Plant Species and Habitats (see Appendix A).

Sensitive Vegetation Communities
Sensitive vegetation communities (also called sensitive natural communities or sensitive habitat) are communities that are of limited distribution statewide or within a county or region and are often vulnerable to environmental impacts of projects (CDFW, 2018). Sensitive habitats are often threatened with local extirpation and are therefore considered as valuable biological resources. The most current version of CDFW’s California Natural Community List indicates which natural communities are sensitive given the current state of the California classification (CDFW, 2022a). The California Natural Community List, Preliminary Descriptions of the Terrestrial Natural Communities of California. State of California (Holland, 1986) and A Manual of California Vegetation, Second Edition (Sawyer et al., 2009) were referenced for ranking the conservation status of vegetation communities within the BSA. The California Natural Community List includes alliance rankings according to their degree of imperilment. NatureServe is a non-profit conservation organization that provides scientific information about rare and endangered species and threatened ecosystems. NatureServe rankings are included as pertinent to sensitive natural communities, discussed in Section 5.2. For this BRE, vegetation communities are considered “sensitive” if they meet any of the following criteria:
•
•
Recognized and considered sensitive by CDFW, USFWS, and/or special interest groups such as the CNPS.

Habitat is under the jurisdiction of the USACE pursuant to Section 404 of the CWA and/or is under the jurisdiction of the CDFW pursuant to §§ 1600-1612 of the California Fish and Game Code.
•
•
•
•
•
Known or believed to be of high priority for inventory in the CNDDB.

Considered regionally rare.

Has undergone a large-scale reduction due to increased encroachment and development.

Supports special-status plant and/or wildlife species.

Functions as an important corridor for wildlife movement.

Based on a review of the CNDDB list generated for this project (CNDDB, 2022a), six sensitive habitats have been recorded within ten miles of the BSA (Table 4.1-2, CNDDB Sensitive Habitat within Ten Miles of the BSA).
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TABLE 4.1-2

CNDDB SENSITIVE HABITAT RECORDED WITHIN TEN MILES OF THE BSA Holland Natural Community MCV Common Alliance Name
California buckwheat - white sage scrub or
Scale broom scrub Riversidian alluvial fan sage scrub
California sycamore - coast live oak riparian
woodlands Southern sycamore-alder riparian woodland (62400) California walnut woodland (71210)
Southern coast live oak riparian forest (61310)
Walnut forest (81600)
California walnut groves
Southern Coast live oak riparian forest
California walnut groves
Canyon live oak forest (81320) Canyon live oak forest and woodland Special-Status Plants
Plant species that are designated federally or state listed endangered, threatened, candidate, or state rare under the ESA, CESA, and/or the NPPA are referred to as “listed species”. Special-status plant species that have no designated status under the ESA, CESA, and/or the NPPA, but are designated as sensitive or locally important by federal agencies, state agencies, or nonprofit resource organizations such as the CNPS, are referred to as “sensitive” in this BRE.

Twenty-three special-status plant species were identified based on a literature review and query from publicly available databases (USFWS, 2022d and 2022e, CNDDB, 2022a, CNPS, 2022a) for reported occurrences within a ten-mile radius of the BSA. (see Appendix A, Figure 7, CNDDB Known Occurrences Plant Species and Habitats). Each special-status plant species was assessed for its potential to occur within the BSA by comparing its habitat, elevation range and distribution obtained from the literature review, the CNPS website (CNPS, 2022a) and other databases with the location and elevation range of the BSA. A species was determined to have “no potential to occur” or as “not expected to occur” within the BSA if the BSA is outside the species’ known distribution and/or the species’ known elevation range, and/or if there is lack of suitable habitat conditions within the BSA to support the species.

Special-status plant species that were determined to have no potential to occur or are not expected to occur within the BSA were eliminated from further evaluation. The analysis of the occurrence potential of special-status plant species, including those determined to have no potential to occur or not expected to occur in the BSA, can be found in Appendix B, Special-Status Species Occurrence Potential Determination.

Twelve special-status plant species were determined to have at least a low potential to occur in the BSA. The special-status plant species and sensitive natural communities that have been recorded within two miles of the BSA are shown on Figure 7, CNDDB Known Occurrences: Plant Species and Habitats (Appendix A).

Special-Status Wildlife
Wildlife species that are designated federally or state listed endangered, threatened, candidate, or state rare under the ESA, CESA, and/or the NPPA are referred to as “listed species”. Special-status 7145/San Dimas MCTA 20-0005 Page 4-3
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wildlife species that have no designated status under the ESA, the CESA, and/or the NPPA, but are designated as sensitive or locally important by federal agencies, state agencies, local agencies and nonprofit resource organizations such as the CNPS are referred to as “sensitive” in this BRE.

Forty-seven special-status wildlife species were identified based on a literature review and query from publicly available databases (CNDDB, 2022a; USFWS, 2022d, e) for reported occurrences within a ten-mile radius of the BSA. These species were identified by one or more of the following means:
reported in the search, recognized as occurring based on previous surveys or knowledge of the area, or observed during the habitat assessment survey. Five listed and 20 sensitive wildlife species were determined to have at least a low potential to occur in the BSA. Three special-status species were observed in the BSA and were therefore determined to be present. These species are monarch butterfly, Nuttall’s woodpecker, and Cooper’s hawk. Special-status wildlife species that have been recorded within two miles of the BSA are found in Appendix A, Figure 8, CNDDB Known Occurrences Wildlife Species and Habitats.

Each special-status wildlife species was assessed for its potential to occur within the BSA by comparing its habitat range and distribution (if known) with the location and elevation range of the BSA. A species was determined to have no potential to occur or is not expected to occur within the BSA if the BSA is outside the species’ known geographic range and/or the species’ known elevation range. Through this analysis, 10 of the special-status wildlife species were determined to have no potential to occur or are not expected to occur within the BSA and were eliminated from further evaluation. It is anticipated that the project will have no impacts to these species and they are listed but not discussed further in this BRE. All wildlife species analyzed through the literature study, including those species that were determined to have no potential to occur or are not expected to occur, are discussed in Appendix B, Special-Status Species Occurrence Potential Determination.

4.1.4 Protected Trees
Prior to field surveys, UltraSystems biologists reviewed the following federal, state, regional and local regulatory agencies to determine which habitat and tree species are protected:
• The State and Federally Listed Endangered, Threatened, and Rare Plants of California (CNDDB, 2022b) which lists species that are protected by state and/or federal acts such as CESA and ESA.
•
•
The CNPS Inventory of Rare and Endangered Plants (CNPS, 2022a) City of San Dimas Tree Preservation Ordinance (City of San Dimas, 2019) Of the abovementioned regulatory agencies, the City tree preservation ordinance (City of San Dimas, 2019) establishes the most specific protections and mitigation requirements for various tree species that occur on development sites. As described in Section 3.3.2 of this BRE, the tree preservation ordinance defines the types of protected trees and the DSH requirements for each type of protected tree.

4.1.5 Waters of the U.S. and State (including Wetlands) Aerial imagery was reviewed to identify natural and man-made drainages, open water (lakes, ponds, etc.), and other features that may be subject to federal or state jurisdictional authority within the BSA. The USGS 7.5-Minute Topographic Map San Dimas Quadrangle was reviewed to identify potential presence or absence of onsite and offsite watercourses, and topographic features than may be indicative of water features. Topographic maps do not show all drainages that may exist. 7145/San Dimas MCTA 20-0005 Page 4-4
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The National Wetlands Inventory (NWI) database and maps developed by the USFWS were used as preliminary indicators of potential wetland areas based on changes in vegetation patterns as observed from satellite imagery. The NWI data were viewed in GIS platforms (Google Earth Pro, 2022), including the USFWS Wetlands Mapper (USFWS, 2022f) to identify potentially jurisdictional features within the planning area as indicated from topographic changes or visible stream patterns.

The digital wetland data for the project vicinity was later verified during biological surveys.

The USGS National Hydrography Dataset (NHD) was also used to identify hydrologic features such as rivers, streams, canals, lakes, and ponds. (USGS, 2022).

Additionally, the watershed boundary data set containing the most current 10-digit and 12-digit HUCs was obtained in geodatabase form from the USGS to aid with assessing USACE jurisdiction of waters draining the BSA.

The following were also reviewed and consulted:
•
•
Corps of Engineers Wetlands Delineation Manual (i.e., 1987 Manual); Regional Supplement to the Corps of Engineers Wetland Delineation Manual: Arid West Region (Version 2.0) (Arid West Supplement; USACE, 2008);
•
•
The National Wetland Plant List. version 3.4 (USACE, 2018); A Field Guide to the Identification of the Ordinary High Water Mark (OHWM) in the Arid West Region of the Western United States: A Delineation Manual (Lichvar and McColley, 2008); and • Updated Datasheet for the Identification of the Ordinary High Water Mark (OHWM) in the Arid West Region of the Western United States (Curtis and Lichvar, 2010).

The USACE published the 1987 Manual for the identification and delineation of wetlands which have since been superseded and presented in regional supplements. In 2008, the USACE published the Arid West Supplement, which is a supplement to the 1987 Manual and describes wetland indicators, delineation guidance, and other information that is specific to the arid west region (USACE, 2008).

4.1.6 Critical Habitat
When a species is listed as federal endangered or threatened, areas of habitat considered essential to its conservation may be designated as critical habitat. Under the ESA, the Secretary of the Department of the Interior is required to designate "critical habitat" for each species it lists under the ESA. Federal agencies are prohibited from authorizing, funding or carrying out actions that "destroy or adversely modify" critical habitat. Section 3 of the ESA defines critical habitat for a threatened or endangered species as [ESA § 3(5)(A)]:
• The specific areas within the geographical area occupied by the species, at the time it is listed in accordance with the provisions of Section 4 of the ESA, on which are found those physical or biological features essential to the conservation of the species and which may require special management considerations or protection; and
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• Specific areas outside the geographical area occupied by the species at the time it is listed in accordance with the provisions of Section 4 of the ESA, upon a determination by the Secretary that such areas are essential for the conservation of the species.

Designated critical habitat is described in 50 CFR Parts 17 and 226. Critical habitat may include areas that are not currently occupied by the species, but that will be needed for its recovery. In addition, the USFWS normally excludes developed areas within mapped critical habitat boundaries as critical habitat. The USFWS’ Critical Habitat Portal was reviewed to identify federal threatened and endangered species designated final and proposed critical habitat designations within ten miles of the BSA (USFWS, 2022d).

4.1.7 Wildlife Corridors
A wildlife corridor is a connection of habitat, generally native vegetation, which joins two or more larger areas of similar habitat that are otherwise separated by natural barriers, changes in vegetation composition, or land permanently altered for human activities; and infrastructure, including roads, railroads, residential development, or fencing. When native vegetation is cleared, fragmented patches of open space or isolated “islands” of wildlife habitat are created. Fragmentation and habitat loss are the two main contributors to continuing biodiversity decline. The main goal of natural corridors is to facilitate movement of individuals, through dispersal, seasonal migration, and movement for foraging, breeding, cover, etc. Corridors allow for physical and genetic exchange between isolated wildlife populations and are critical for the maintenance of ecological processes, including allowing for the movement of animals and the continuation of viable populations and higher species diversity.

Habitat within the corridor generally contains biological and physical features that are needed to temporarily support wildlife and allow avian and ground-dwelling wildlife to safely move through it.

Wildlife corridors may either be contiguous strips of vegetation and habitat, such as ridgelines or riverbeds, or intermittent patches of habitat or physical features spaced closely enough to allow safe travel. Corridors can be natural, such as a riparian corridor, or man-made, such as culverts, tunnels, drainage pipes, walls, underpasses, overpasses, or streets. Man-made corridors are often referred to as “wildlife crossings” and they allow wildlife to pass over, under, or through physical barriers that otherwise hinder movement. Wildlife corridors also vary greatly in size, shape, and composition.

In general, the wider and more safeguarded a wildlife corridor is from adjacent human activities, noise, traffic, and light, the better it functions for the movement of wildlife. To determine the potential for the BSA to contain wildlife corridors, biologists used the BIOS Habitat Connectivity Viewer to search for CDFW Essential Connectivity Areas, Natural Landscape Blocks, and Interstate Connections within the BSA and vicinity (CDFW, 2022b). In addition to reviewing the BIOS Habitat Connectivity Viewer, biologists reviewed the San Dimas Quadrangle Map and viewed aerial imagery to search for physical features that might serve as wildlife corridors. Biologists also used GIS software to determine the BSA’s location in relation to areas that could serve as wildlife corridors. Finally, the literature review also included maps and reports on wildlife home ranges and migration and dispersal patterns (CDFW, 2014).

4.1.8 Significant Ecological Areas (SEAs)
The Los Angeles County SEA Program consists of the following components: the SEA Goals and Policies found in the Conservation and Natural Resources Element of the Los Angeles County General Plan 2035; the Significant Ecological Areas and Coastal Resource Areas Policy Map (“SEA Boundary 7145/San Dimas MCTA 20-0005 Page 4-6
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Map”) also found in the Los Angeles County General Plan 2035; and the SEA Ordinance of the County Zoning Code.

Areas of the County designated as SEAs satisfy at least one of the following six SEA Selection Criteria:

A. Habitat of core populations of endangered or threatened plant or animal species.

B. On a regional basis, biotic communities, vegetative associations, and habitat of plant or animal species that are either unique or are restricted in distribution.

C. Within the County, biotic communities, vegetative associations, and habitat of plant or animal species that are either unique or are restricted in distribution D. Habitat that at some point in the life cycle of a species or group of species, serves as concentrated breeding, feeding, resting, migrating grounds and is limited in availability either regionally or in the County.

E. Biotic resources that are of scientific interest because they are either an extreme in physical/geographical limitations or represent unusual variation in a population or community.

F. Areas that would provide for the preservation of relatively undisturbed examples of the original natural biotic communities in the County
Appendix E of the Los Angeles County General Plan includes detailed descriptions of each SEA, including boundaries, representative resources, wildlife movement opportunities, and designation criteria analysis. The SEA designation does not identify every individual biotic resource, and SEAs are not preserves or conservation areas; rather, SEAs are areas in which planning decisions are made with extra sensitivity toward biological resources and ecosystem functions (LACRP, 2019, pp. 6-7)

4.2 Field Survey Methods
This Section describes the field survey methods used by UltraSystems biologists within the BSA during the 2022 field surveys. Biologists visited the BSA to conduct the following biological surveys:
•
•
•
•
•
•
Habitat assessment and plant community and land cover type mapping; General plant surveys;
General wildlife surveys;
Burrowing owl (Athene cunicularia; BUOW) habitat assessment Wildlife movement evaluation;
Jurisdictional assessment (waters of the U.S. and State).

The purpose of the field work was to evaluate the initial results of the literature review and to collect additional data on existing site conditions. The general biological surveys covered accessible areas of the BSA, including areas that will be impacted by the project. The surveys were conducted during the daytime on foot by walking slowly across each habitat type, where accessible. For the BUOW habitat assessment survey, biologists only covered those specific habitat areas that are known to provide suitable habitat for the BUOW. Biologists used binoculars from strategic vantage points whenever direct access was not possible, due to private property with no access rights, chain-linked fences, and locked gates. Observations were also made with aerial imagery for inaccessible areas. 7145/San Dimas MCTA 20-0005 Page 4-7
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Field surveys were conducted as described in Table 4.2-1.

Table 4.2-1

FIELD SURVEY INFORMATION
Survey
Date
Survey
Time
Temp.
F
Survey
Conducted Conditions Biologist(s)
0% cc
0% precip.
0-3 mph wind
June 30,
2022
10:00 a.m. –
2:30 p.m. 79-83F
74-91F
71-89F
MT Reconnaissance Survey
Reconnaissance Survey
0% cc
0% precip.
0-1 mph wind
July 1,
2022
7:45 a.m. –
5:15 p.m. MT & JM

MT & JM
0% cc
0% precip.
0 mph wind
July 19,
2022
8:00 a.m.-
12:00 p.m.

Spot check areas for
mapping (no field form)
50-70% cc
0% precip.
0 mph wind
August 4,
2022
7:30 a.m. –
2:00 p.m. 70-93F
71-94F
MT/ES
MT/ES
Reconnaissance Survey
Reconnaissance Survey
0% cc
0% precip.
0 mph wind
August 5,
2022
7:30 a.m. –
3:00 p.m.

Notes
MT = Michelle Tollett; JM = Joyce Mak; ES = Erik Segura – cc = cloud cover; precip = precipitation Biologists used pertinent regional flora and fauna field guides, topographic, and aerial maps during field surveys to help direct them in the field, to assist in identifying habitat and physical features, and to identify and record special-status species. In addition, biologists used Global Positioning System (GPS) units and other GIS and survey-related techniques, hardware and software to collect data and populate attributes required by the relevant agencies. Digital color photographs were taken during the field surveys to record site conditions at the time of the field surveys. The methods for each type of biological surveys are described in the following sections.

4.2.1 Habitat Assessment and Land Cover Type Mapping
The general habitat assessment and vegetation mapping survey was conducted by UltraSystems biologists (see Table 4.2-1). Areas within the BSA were surveyed using a meandering search pattern pedestrian and binocular survey within the BSA. Offsite areas During the survey, plant and wildlife species, vegetation communities, and land cover types were identified. 7145/San Dimas MCTA 20-0005 Page 4-8
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Biologists characterized the existing habitat and searched for the presence of sensitive vegetation communities. The purpose of the habitat assessment was to ascertain existing site conditions and identify habitat areas that could be suitable for special-status plant and wildlife species.

Descriptions of vegetation communities, land cover types and habitat within the biological survey areas were based on the dominant perennial plant species or physical features. Generally, classifications of habitat types or vegetation communities were based on A Manual of California Vegetation, Second Edition (Sawyer et al., 2009) with modifications to better represent existing site conditions. Each habitat type identified in Sawyer et al. (2009) was cross-referenced with the following resources and classification systems so that a more accurate characterization of the existing habitat types and vegetation communities could be identified: Preliminary Descriptions of the Terrestrial Communities of California (Holland, 1986), and the CDFW’s California Natural Community List (CDFW, 2020).

Vegetation communities observed by the biologists were identified and mapped in the field by marking their limits on an orthorectified aerial image or delineated using a GSP unit. Boundaries of private property (i.e., project sites) that would potentially be impacted by grading under the proposed MCTA were given particular attention.

In addition to the vegetation communities, topography, soil characteristics, substrates, and disturbed and developed areas were components of the habitat assessment in order to determine suitability for special-status plants and wildlife. Following the field mapping, UltraSystems’ GIS staff downloaded the data from the GPS units and/or digitized the boundaries from aerial maps into an ArcGIS file. Once the boundaries were in ArcGIS, the acreage of each land cover feature present within the BSA was calculated.

4.2.2 General Plant Surveys
Prior to the start of field surveys, biologists researched information on the blooming periods and habitat preferences for the special-status plants determined to have potential to occur within the BSA based on known distribution and elevation extent within the species range. Biologists then surveyed the BSA to identify habitat, vegetation, and for the potential presence of special-status plant species, focusing on areas that appeared to provide suitable habitat for special-status plant species. Plant species were identified in the field and also in the office, when necessary, using plant field guides and taxonomical guides, such as The Jepson Manual: Vascular Plants of California, second edition (Baldwin et al., 2012). All identifiable plant species encountered during the field surveys were recorded in field notes.

The biologists paid special attention to areas that appeared to provide suitable habitat for specialstatus species. Special focus was given to potential jurisdictional sites. Plant species were identified using plant field and taxonomical guides, such as The Jepson Manual: Vascular Plants of California, second edition (Baldwin et al., 2012). Plant species that would be encountered during the field surveys would be identified, recorded in field notes, counted (if population was small) or estimated (if population was large), and mapped on an aerial map and/or with a GPS unit. Diagnostic photographs would also be taken of special-status plants where they occurred, as well as representative habitat.
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Survey tasks included completion of a list of taxa identified throughout the BSA and subsequent addition of new taxa as they were discovered. Unknown species were identified at a later date using dichotomous keys, high quality photos, and other proprietary identification aids. A complete list of all species documented onsite is in Appendix D, Plant and Wildlife Species Recorded During Field Surveys.

After the field surveys and mapping of the land cover types were complete, an additional evaluation was conducted in the office for each special-status wildlife species in the wildlife inventory. The evaluation considered whether the BSA contained suitable habitat to support those special-status wildlife species. A species was determined to have no potential to occur or is not expected to occur within the BSA if suitable and adequate biological and physical features that are needed to support the wildlife species are absent from the BSA. Special-status wildlife species determined to have no potential to occur or are not expected to occur within the BSA and therefore will not be affected by the project are listed in Section 5.4.2, Listed Endangered, Threatened, and Candidate Wildlife, and Section 5.4.3, Sensitive Wildlife, but are otherwise eliminated from further evaluation and are not discussed further in this BRE. The potential to occur analysis can be found in Appendix B, SpecialStatus Species Occurrence Potential Determination.

The literature review, habitat assessment, and general plant surveys concluded that the BSA contains suitable habitat, soils, and/or other factors to support several of the special-status species in the plant inventory. It was determined that 14 of the special-status species in the plant inventory have at least a low potential to occur within the BSA; these species are presented in Appendix B, Special-Status Species Occurrence Potential Determination.

4.2.3 General Wildlife Surveys
Prior to conducting field surveys, biologists researched information on the natural history and habitat preferences for the special-status wildlife determined to have potential to occur within the BSA based on known distribution and recorded observations. The BSA is within the general distributional range of several special-status vertebrate species.

Biologists surveyed the BSA for common wildlife and the presence of special-status wildlife species.

The purposes of the wildlife surveys were to note those species observed, ascertain general site conditions, and identify areas with habitat that would be suitable for special-status wildlife species.

Wildlife species encountered visually or audibly during the field surveys were identified and recorded in field notes. Biologists also recorded signs of wildlife, including animal tracks, burrows, dens, nests, nest sites, scat, or remains. They also surveyed areas that would potentially serve as roosting habitat and/or hibernacula for bat species.

After the field surveys and mapping of the land cover types were complete, an additional evaluation was conducted in the office for each special-status wildlife species in the wildlife inventory. The evaluation considered whether the BSA contained suitable habitat to support those special-status wildlife species. A species was determined to have “no potential to occur” within the BSA if suitable and adequate biological and physical features that are needed to support the wildlife species are absent from the BSA. Special-status wildlife species determined to have no potential to occur within the BSA, and therefore will not be affected by the project, are listed in Section 5.4.2, Listed Endangered, Threatened, and Candidate Wildlife, and Section 5.4.3, Sensitive Wildlife, but are otherwise eliminated from further evaluation and are not discussed further in this BRE. The potential 7145/San Dimas MCTA 20-0005 Page 4-10
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to occur analysis can be found in Appendix B, Special-Status Species Occurrence Potential Determination.

4.2.4 Waters of the U.S. and State (including Wetlands) Under existing conditions, stormwater generated on the developed portions of the southern half of the BSA enters the municipal storm drain system on the north and south corners of Calle Cristina at the intersection of Calle Francesca and subsequently into the municipal storm drainage system (which is comprised of a combination of standard culverts and storm drains, and open ditches).

Stormwater generated on the undeveloped areas of the BSA sheet flows down slopes and either into the small canyons, where it ponds and infiltrates, or directly into open ditches that direct stormwater into the storm drain system. Ultimately, stormwater generated on the BSA is discharged into Walnut Creek (see Section 5.5).

4.2.5 Wildlife Movement Evaluation
Biologists conducted an evaluation of potential wildlife movement within the BSA and vicinity through a literature review, field surveys, and by examining aerial imagery and maps. While in the field, biologists searched for potential natural and man-made travel routes that wildlife could use to traverse the site. Biologists assumed wildlife species would use these linear features for travel as well as natural areas. Biologists also searched for natural and man-made barriers to wildlife movement, such as permanent structures, or densely commercialized or industrialized areas that could interfere with the movement of wildlife.
7145/San Dimas MCTA 20-0005 Page 4-11
Biological Resources Evaluation Report Page 1297 – 2053 December 2022 ❖ RESULTS ❖

5.0 RESULTS
This section describes the results of the literature review and the conditions existing within the BSA at the time the biological field surveys were conducted.

5.1 Environmental Setting
The BSA is located in a setting that contains primarily developed (residential/suburban) and landscaped areas. Much of the land surrounding the BSA has been developed and landscaped.

The topography of the BSA can be characterized as an area of ridges and small vegetated canyons.

Most of the ridges are developed with single-family residences on large parcels; these parcels slope toward the canyons and tend to be well-vegetated beyond their landscaped backyards.

The BSA is not located within or adjacent to a flood hazard zone designated by the Federal Emergency Management Agency (see Section 4.10).

5.1.1 Land Use
Between 1948 and prior to residential development in the 1980s, the BSA consisted of open space supporting trees and grasslands, interspersed by small canyons (NETROnline, 2022).

5.1.2 Local Climate
The City of San Dimas has a mild, semi-arid climate with Mediterranean characteristics. Most precipitation falls between November and March. Semi-arid climates tend to support short or scrubby vegetation, with semi-arid areas usually dominated by either grasses or shrubs. The nearest climate data station to the BSA is operated by the California Irrigation Management System (CIMIS) and is located at Cal Poly Pomona (CIMIS Station 078), approximately two miles southeast of the BSA; this station is at an elevation of 730 feet, which is similar to the elevation of the BSA.

CIMIS Station 078 has been in operation since March 14, 1989. Between January 1, 1990 and December 31, 2021, this station recorded an average annual precipitation of 15.3 inches; average maximum air temperature for the period of record was 76.1 °F, and average minimum temperature was 50.5 °F (CIMIS, 2022).

5.1.3 Soils
The USDA NRCS Web Soil Survey (Soil Survey Staff, 2022) has mapped three soil units within the BSA.

These soil units are summarized in Table 5.1-1, Summary of Mapped Soil Units (see Appendix A, Figure 6, USDA Soils and Appendix C, Soils Report). None of the soil map units are listed as hydric soils on the Soil Data Access (SDA) Hydric Soils List (USDA-NRCS, 2022a). 7145/San Dimas MCTA 20-0005 Page 5-1
Biological Resources Evaluation Report Page 1298 – 2053 December 2022 ❖ RESULTS ❖
Table 5.1-1

SUMMARY OF MAPPED SOIL UNITS
Hydrologic Soil
Group Rating
Acres in
BSA Name Symbol
1007
pH

7.9 7.9
Drainage Class
No data
Urban land-BiscailuzPico complex, 0 to 2
percent slopes
Zaca-Apollo, warm
complex, 20 to 55
percent slopes
B
C

16.9 1141 Well-drained 180.0
Counterfeit-Urban land
complex, 10 to 35
percent slopes,
Somewhat
poorly drained 1232 7.8 C 52.4
terraced
SOURCE: Soil Survey Staff 2022
NOTES: Drainage Class: Well-drained soils are soils from which water is removed from the soil readily but not rapidly Water is available to plant throughout most of the growing season in humid regions, and wetness does not inhibit growth for significant periods during most growing seasons. Somewhat poorly drained soils are soils in which water is removed so slowly that the soil is wet at a shallow depth for significant periods during the growing season.

Hydrologic Soil Group Rating: Group B Soils are soils which have a moderate infiltration rate when thoroughly wet.

These consist chiefly of moderately deep or deep, moderately well drained or well drained soils that have moderately fine texture to moderately coarse texture. These soils have a moderate rate of water transmission. Group C Soils are soils which have a slow infiltration rate when thoroughly wet. These consist chiefly of soils having a layer that impedes the downward movement of water or soils of moderately fine texture or fine texture. These soils have a slow rate of water transmission.

The BSA is dominated by Zaca-Apollo, warm complex, 20 to 55 percent slopes. This soil unit is primarily clay derived from colluvium and/or residuum weathered from sandstone and siltstone (Soil Survey Staff, 2022; USDA, 2011; USDA, 1995). This soil unit is found primarily on hillslopes and is welldrained with a slow water infiltration rate.

5.2 Land Cover Types
Eleven land cover types were observed and mapped within the BSA, and are presented with corresponding acreages in Table 5.2-1. Refer to Appendix A, Figures 9a through 9e, Land Cover Types Mapbook, for the location and extent of each land cover type within the BSA. Photographs of different land cover types onsite are located in Appendix E, Representative Site Photographs.

Classifications of the plant communities are based on Holland’s Preliminary Descriptions of the Terrestrial Communities of California (Holland, 1986) and A Manual of California Vegetation Second Edition (Sawyer et al., 2009).
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Biological Resources Evaluation Report Page 1299 – 2053 December 2022 ❖ RESULTS ❖
Table 5.2-1

ACREAGE OF MAPPED LAND COVER TYPES WITHIN THE BSA
Grading
Area 20ft
Beyond 35%
Impact Area
Limit
Parcel Non
Conservation
Outside 35/
20% Zones
(acres)
Total
Impact
Area
35% Lot
Coverage
(acres)
MCV2 Alliance
Name1
Holland
Classification2
BSA
(acres) Mapped Land Cover
(acres)
(acres)
southern coastal
bluff scrub California buckwheat
scrub 2.85

1.54 0.83 <0.01 0.54 1.37
(31200)
Eriogonum
fasciculatum
Shrubland Alliance disturbed
southern coastal
bluff scrub
California buckwheat
scrub (disturbed) - - - -
(31200)
Diegan coastal
sage scrub,
Riversidian
upland sage
scrub
Artemisia
californica - Salvia
mellifera
California sagebrush -
black sage scrub 4.86 0.98 <0.01 0.61 1.59
Shrubland Alliance
7145/ San Dimas Municipal Code Text Amendment
Biological Resources Evaluation Report