San Dimas City Council
May 14, 2024

 SECTION 4.9 – HAZARDS AND HAZARDOUS MATERIALS 
7091/ Allen-Cataract Warehouse Project Page 4.9-7
Initial Study/Mitigated Negative Declaration January 2023 g) Would the project expose people or structures, either directly or indirectly, to a significant risk of loss, injury, or death involving wildland fires? Less than Significant Impact
The project site is not in a fire hazard severity zone mapped by the California Department of Forestry and Fire Protection (CAL FIRE); the nearest such zone to the project site is approximately 0.5 miles to the north (CAL FIRE, 2021). Figures 4.9-1 and 4.9-2 show Fire Hazard Severity Zones for State and Local responsibility, respectively. The project site and surrounding areas are built out with urban land uses. The nearest substantial area of natural vegetation to the project site is in the foothills of the San Gabriel Mountains, approximately 0.7 miles to the north. Project development would not expose people or structures to substantial wildfire risks, and impacts would be less than significant.

 SECTION 4.9 – HAZARDS AND HAZARDOUS MATERIALS 
7091/ Allen-Cataract Warehouse Project Page 4.9-8
Initial Study/Mitigated Negative Declaration January 2023 Figure 4.9-1
FIRE HAZARD SEVERITY ZONE – STATE RESPONSIBILITY AREA

 SECTION 4.9 – HAZARDS AND HAZARDOUS MATERIALS 
7091/ Allen-Cataract Warehouse Project Page 4.9-9
Initial Study/Mitigated Negative Declaration January 2023 Figure 4.9-2
FIRE HAZARD SEVERITY ZONE – LOCAL RESPONSIBILITY AREA

 SECTION 4.10 - HYDROLOGY AND WATER QUALITY 
7091/ Allen-Cataract Warehouse Project Page 4.10-1
Initial Study/Mitigated Negative Declaration January 2023

4.10 Hydrology and Water Quality
Would the project:

Potentially
Significant
Impact
Less than
Significant
Impact with
Mitigation
Incorporate
d
Less than
Significant
Impact
No
Impact
a) Violate any water quality standards or waste
discharge requirements or otherwise
substantially degrade surface or ground
water quality?
X
b) Substantially decrease groundwater supplies
or interfere substantially with groundwater
recharge such that the project may impede
sustainable groundwater management of the
basin?
X
c) 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:
(i) Result in substantial erosion or siltation
on- or offsite; X
(ii) substantially increase the rate or amount
of surface runoff in a manner which
would result in flooding on- or offsite;
X
(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; or
X
(iv) impede or redirect flood flows? X
d) In flood hazard, tsunami, or seiche zones, risk
release of pollutants due to project
inundation?
X
e) Conflict with or obstruct implementation of a
water quality control plan or sustainable
groundwater management plan?
X

 SECTION 4.10 - HYDROLOGY AND WATER QUALITY 
7091/ Allen-Cataract Warehouse Project Page 4.10-2
Initial Study/Mitigated Negative Declaration January 2023 a) Would the project violate any water quality standards or waste discharge requirements or otherwise substantially degrade surface or ground water quality? Less than Significant Impact
The project site is currently developed with nine vacant single-family residences. The natural ground topography of the site slopes towards the south and drains onto Allen Avenue, then runs westerly along Allen Avenue. The proposed drainage pattern will also be to the south towards the curb and gutter. The project proposes two drainage areas, 1A and 1B. The runoff for Area 1A will drain onto the landscape. The project proposes to have an infiltration trench at the drive aisle from which runoff will permeate with any excess drainage being discharged onto Allen Avenue through a parkway drain. Area 1B will also drain to the landscape area and into a different infiltration trench adjacent to Allen Avenue with excess runoff being discharged through the curb face along Allen Avenue. The nearest storm drain inlets to the project site are on Allen Avenue and Cataract Avenue (Seaboard, 2022) (Figure 4.10-1). A 30-inch reinforced concrete pipe (RCP) storm drain under Cataract Avenue discharges into a 63-inch RCP storm drain on Allen Avenue (LACPW, 2022). The drainage path from the Allen Avenue storm drain to the Pacific Ocean is as follows (Figure 4.12-2).

Impacts related to water quality would occur during the following three periods;

1. During the earthwork and construction phase, when the potential for erosion, siltation, and sedimentation would be the greatest;

2. Following construction, prior to the establishment of ground cover in the landscaped areas, when the erosion potential may remain relatively high; and

3. Following the completion of the project, when impacts related to sedimentation would diminish, but those associated with urban runoff would increase.

Construction Pollutant Controls
The project owner would be 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 the federal Clean Water Act (CWA) § 402, National Pollution Discharge Elimination System (NPDES) for projects which will disturb one or more acres of soil during construction. The Construction General Permit requires potential dischargers of pollutants into the Waters of the U.S. (WOUS) to prepare a site-specific Stormwater Pollution Prevention Plan (SWPPP), which establishes enforceable limits on discharges, requires effluent monitoring, designates reporting requirements, and requires construction BMPs to reduce or eliminate point and nonpoint source discharges of pollutants.

The project would be required to prepare an SWPPP, and implement the Low-Impact Development (LID) plan’s BMPs prior to the commencement of construction activities, to obtain coverage under the Statewide General Construction Permit. Additionally, BMPs must be maintained and inspected before and after each rainstorm and repaired or replaced as necessary. Because the project is required by the SWRCB to comply with all applicable conditions of Construction General Permit Project Site to
Allen Avenue
West to
San Dimas
Wash
West to Big
Dalton
Wash
Southwest to
Walnut Creek
Channel
West to
San Gabriel
River
South to
Pacific
Ocean.

 SECTION 4.10 - HYDROLOGY AND WATER QUALITY 
7091/ Allen-Cataract Warehouse Project Page 4.10-3
Initial Study/Mitigated Negative Declaration January 2023 Order 2009-0009-DWQ, potential violations of water quality standards or wastes discharge requirements during project construction would be less than significant.

Operational Pollutant Controls
The municipal stormwater (MS4) permit for the coastal watersheds of Los Angeles County (Los Angeles Regional Water Quality Control Board Order No. R4-2012-0175-A01) and the City of San Dimas Public Works Department regulate the discharge of pollutants into WOUS through stormwater and urban runoff conveyance systems, including flood control facilities. These conveyance systems are commonly referred to as municipal separate storm sewer systems (MS4s), or storm drains.

Pursuant to the MS4 Permit, permittees, including the City of San Dimas, must regulate discharges of pollutants in urban runoff from human-caused sources into stormwater conveyance systems within their jurisdictions.

As new development and redevelopment occur, it can significantly increase pollutant loads in stormwater and urban runoff because increased population density results in proportionately higher levels of vehicle emissions, vehicle maintenance wastes, municipal sewage wastes, household hazardous wastes, fertilizers, pet waste, trash, and other human-caused pollutants (RWQCB, 2010).

The Los Angeles County MS4 Permit requires new development and significant redevelopment projects to incorporate post-construction low-impact development BMPs into project design to reduce or eliminate the quantity, and improve the quality of, stormwater being discharged from the project site.

The project proposes three onsite storm drains:
 One along most of the northern half of the east edge of the project site; would discharge to the existing storm drain on Cataract Avenue.
 One along the southern part of the east edge of the project site; would discharge to the existing storm drain on Allen Avenue.
 One along the northern and western edges of the site that would discharge into the existing storm drain in Allen Avenue.

With the implementation of construction and operational BMPs, potential impacts on water quality would be less than significant and mitigation is not proposed. b) Would the project substantially decrease groundwater supplies or interfere substantially with groundwater recharge such that the project may impede sustainable groundwater management of the basin?
Less Than Significant Impact
The project site is located in the Main San Gabriel Valley Groundwater Basin, which spans approximately 255 square miles in east-central Los Angeles County (DWR, 2021). Golden State Water Company (GSWC) San Dimas System provides water to the project site. 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

 SECTION 4.10 - HYDROLOGY AND WATER QUALITY 
7091/ Allen-Cataract Warehouse Project Page 4.10-4
Initial Study/Mitigated Negative Declaration January 2023 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. Water demand projections are based on growth projections from the Southern California Association of Governments (SCAG), which in turn are based on forecasts according to 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. Project development would not substantially decrease groundwater supplies.

The project site is not used for intentional groundwater recharge, and project development would not interfere with groundwater recharge. Impacts would be less than significant. c) 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 that would:
i) Result in substantial erosion or siltation on- or offsite; Less Than Significant Impact
The proposed project site is situated on relatively level ground and ephemeral, intermittent, or perennial streams or rivers were not observed during the biological survey conducted for the project.

Site preparation and grading at the project site would comply with the City of San Dimas grading code requirements. Furthermore, because the construction of the proposed project would disturb more than one acre of ground, it would be required to obtain coverage under the Construction General Permit. Dischargers whose projects disturb one or more acres of soil are required to obtain coverage under the General Permit for Discharges of Storm Water Associated with Construction Activity Construction General Permit Order 2009-0009-DWQ. Construction activity subject to this permit includes clearing, grading, and disturbances to the ground such as stockpiling, or excavation, but does not include regular maintenance activities performed to restore the original line, grade, or capacity of the facility (SWRCB, 2020).

This Construction General Permit includes performance standards for postconstruction that are consistent with State Water Board Resolution No. 2005-0006, "Resolution Adopting the Concept of Sustainability as a Core Value for State Water Board Programs and Directing Its Incorporation," and 2008-0030, “Requiring Sustainable Water Resources Management.“ The requirement for all construction sites to match pre-project hydrology will help ensure that the physical and biological integrity of aquatic ecosystems is sustained. This “runoff reduction” approach is analogous in principle to Low Impact Development and will serve to protect related watersheds and waterbodies from both hydrologic-based and pollution impacts associated with the post-construction landscape (SWRCB, 2020).

The General Construction Permit requires the development of an SWPPP by a certified qualified SWPPP developer. The required SWPPP would be project-specific and would prescribe site-specific stormwater BMPs which would be intended to minimize or avoid having soil leave the project site, through either stormwater or wind, and thus minimize or avoid soil erosion on site and siltation in receiving waters.

 SECTION 4.10 - HYDROLOGY AND WATER QUALITY 
7091/ Allen-Cataract Warehouse Project Page 4.10-5
Initial Study/Mitigated Negative Declaration January 2023 With the implementation of a project-specific SWPPP and proper maintenance and replacement of required stormwater BMPs (as necessary), potential impacts resulting in substantial erosion or siltation on- or offsite would be minimized or avoided, and impacts would be less than significant. No mitigation is proposed.
ii) Substantially increase the rate or amount of surface runoff in a manner which would result in flooding on- or offsite; or
i) 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;
As detailed in Section 4.10 a) above, the proposed project incorporates operational LID BMPs in compliance with the City of San Dimas permit requirements. The proposed project does not have offsite run-on. The industrial property on the north side, has drainage runoff to Cataract Avenue and the one on the west side drains to West Allen Avenue. The proposed drainage pattern will be to the south. The runoff for Area 1 A will drain into the landscape. It is proposed to have an infiltration trench at the drive aisle runoff, and infiltration or any excess drainage will be discharged to West Allen Avenue through a parkway drain. Area 1B will drain to the landscape area and into the infiltration trench along West Allen avenue and excess runoff will also be discharged through the curb face. (Seaboard, 2022 pp. 3-4).

The proposed project would not cause a substantial increase in the rate or amount of surface runoff in a manner that would: (1) result in flooding on- or offsite; (2) would not 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; or (3) 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. Impacts would be less than significant, and no mitigation is proposed.
iv) Impede or redirect flood flows?
No Impact
San Dimas has three flood zone designations: A9, B, and C. Flood Zone A9 covers a small stretch of the San Dimas Canyon Wash south of the Golden Hills Road and is subject to flooding in a 100-year zone. Areas along the San Dimas Canyon Wash and just south and west of the Foothill Freeway north of Arrow Highway could be impacted by a 100- to 500-year storm and fall into Flood Zone B. Flood Zone C is subjected to minimal flooding and includes the balance of the city (San Dimas 2008).

However, the project is outside of 100-year and 500-year flood zones (FEMA, 2021). Project development would not impede or redirect flood flows, and no impact would occur (LA County, 2022).

 SECTION 4.10 - HYDROLOGY AND WATER QUALITY 
7091/ Allen-Cataract Warehouse Project Page 4.10-6
Initial Study/Mitigated Negative Declaration January 2023 d) In flood hazard, tsunami, or seiche zones, risk release of pollutants due to project inundation?
No Impact
As described in Section 4.10 iv) above, the proposed project site is above the 100-year and the 500- year flood hazard zones and it is not anticipated that the site would become inundated due to flood.

A tsunami is a sea wave (or series of waves) of local or distant origin that results from large-scale seafloor displacements associated with large earthquakes, major submarine slides, or exploding volcanic islands (California Seismic Safety Commission, 2020). A review of the Los Angeles County, California Tsunami Inundation Maps (CGS, 2021) revealed that the tsunami inundation zone nearest to the proposed project site would be at Los Alamitos in western Orange County, approximately 27 miles southwest of the project site. Therefore, no tsunami hazard is present on-site, and project development would not risk the release of pollutants due to tsunami inundation.

A seiche is an oscillating wave caused by wind, tidal forces, earthquakes, landslides, and other phenomena in a closed or partially closed water body such as a river, lake, reservoir, pond, and other large inland water body. A review of aerial imagery (Google Earth, 2021) revealed no water bodies large enough to support a seiche near the proposed project site. Therefore, it is not anticipated that the proposed project would be inundated by a seiche.

The project site is outside of dam inundation areas mapped by the Department of Water Resources (DWR, 2021b). Project development would not risk the release of pollutants due to dam inundation.

No impact would occur.
e) Conflict with or obstruct implementation of a water quality control plan or sustainable groundwater management plan?
No Impact
The project site is in the Los Angeles Regional Water Quality Control Board's (LARWQCB)’s jurisdictional area. The water quality control plan in effect in the project region is the LARWQCB Basin Plan issued in 2014. The groundwater management plan in effect in the project region is the Five-Year Water Quality and Supply Plan issued by the Main San Gabriel Basin Watermaster (Watermaster). The Basin Plan sets forth water quality objectives for surface waters and groundwater basins in the LARWQCB region; beneficial uses, that is, uses to which water can be put to use for the benefit of people and wildlife; plans, policies, and actions intended to achieve water quality objectives; and describes monitoring and assessment programs used to measure attainment of water quality objectives (LARWQCB, 2014). The MS4 Permit mentioned in Section 4.10a was issued pursuant to the Basin Plan. Therefore, implementation of the project’s low-impact development plan in accordance with the MS4 permit would assure that project operation would conform with plans and policies specified in the Basin Plan.

The Five-Year Water Quality and Supply Plan describe Watermaster’s programs for developing and monitoring water supplies; drought management; water quality cleanup, monitoring, and pollution prevention programs (Watermaster, 2021). Project impacts on groundwater would be less than significant, as substantiated in Section 4.10.b above. Therefore, project development would not conflict with or obstruct the implementation of the Five-Year Water Quality and Supply Plan.

 SECTION 4.10 - HYDROLOGY AND WATER QUALITY 
7091/ Allen-Cataract Warehouse Project Page 4.10-7
Initial Study/Mitigated Negative Declaration January 2023 Figure 4.10-1

STORM DRAINS

 SECTION 4.11 - LAND USE AND PLANNING 
7091/ Allen-Cataract Warehouse Project Page 4.11-1
Initial Study/Mitigated Negative Declaration January 2023

4.11 Land Use and Planning
Would the project:

Potentially
Significant
Impact
Less than
Significant
Impact with
Mitigation
Incorporated
Less than
Significant
Impact
No
Impact
a) Physically divide an established
community? X
b) Cause a significant environmental
impact due to a conflict with any land
use plan, policy, or regulation adopted
for the purpose of avoiding or
mitigating an environmental effect?
X
a) Would the project physically divide an established community? No Impact
The proposed project is located on a piece of land that contains nine residential structures with various non-habitable accessory structures and disturbed open spaces spread throughout the property. The project site is surrounded primarily by light manufacturing to the north, east, and west, and residential to the south.

The project would introduce a new industrial warehouse, which would be similar to existing nearby land uses. Additionally, the project would not divide existing public spaces in the vicinity of the site or extend beyond the project site’s boundaries. Furthermore, no streets or sidewalks would be permanently closed as a result of the development. The project would utilize existing roadways, resulting in no change in roadway patterns. No separation of uses or disruption of access between land-use types would occur as a result of the project. Therefore, the project would not physically divide an established community and no impact would occur. b) Would the project cause a significant environmental impact due to a conflict with any land use plan, policy, or regulation adopted for the purpose of avoiding or mitigating an environmental effect?
No Impact
As shown in Figure 4.11-1, the City’s General Plan land use designation for the project site is Industrial (City of San Dimas, 2020). As shown in Figure 4.11-2, the City’s zoning designation for the project site is Light Agricultural “AL”. However, the current use on the project site is residential. The project site does not support any agricultural use. A change of zone to Light Manufacturing “M-1” has been requested under the project, which would allow for industrial warehouse uses, consistent with the proposed project (City of San Dimas, 2022). Moreover, land uses to the north, east, and west of the project site have similar industrial land use designations and existing industrial developments.

With the change in zoning from AL to M-1, the project would not conflict with any applicable land use plan, policy, or regulation and no impact would occur.

 SECTION 4.11 - LAND USE AND PLANNING 
7091/ Allen-Cataract Warehouse Project Page 4.11-2
Initial Study/Mitigated Negative Declaration January 2023 Figure 4.11-1

PROPOSED PROJECT SITE CURRENT GENERAL PLAN LAND USE DESIGNATIONS

 SECTION 4.11 - LAND USE AND PLANNING 
7091/ Allen-Cataract Warehouse Project Page 4.11-3
Initial Study/Mitigated Negative Declaration January 2023 Figure 4.11-2

PROPOSED PROJECT SITE CURRENT ZONING DESIGNATIONS

 SECTION 4.12 – MINERAL RESOURCES 
7091/Allen Avenue Warehouse Project Page 4.12-4
Initial Study/Mitigated Negative Declaration January 2023

4.12 Mineral Resources
Would the project:

Potentially
Significant
Impact
Less than
Significant
Impact with
Mitigation
Incorporated
Less than
Significant
Impact
No
Impact
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?
X
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 landuse plan?
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? i) 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 landuse plan? Less Than Significant Impact
The proposed project site is mostly located within Mineral Resource Zone (MRZ)-2, but slightly within MRZ-3, which is an area where adequate information indicates that significant mineral deposits are present, or where it is judged that a high likelihood of their presence exists (DOC, 2019b). However, according to the Land Use and Zoning sections of the City of San Dimas General Plan, the City does not include mining in any of its zoning categories. Also, it is unlikely that anyone would propose establishing new surface mining operations within the city since it is not allowed within the city. According to the California Geologic Energy Management Division’s Well Finder online tool, as shown in Figure 4.12-1, the project site is not located near (within one mile of) any oil or gas wells (DOC, 2020b). Figure 4.12-2 shows that there are no geothermal wells in the vicinity of the project.

Although this project is located within MRZ-2 and MRZ-3, where significant amounts of deposits might be present, the project cannot and will not interfere with the availability of these resources since they cannot be accessed due to the requirements of the City of San Dimas’ General Plan, that does not allow active mining within the city limits. Therefore, the project site is not an important local mineral resource recovery site and the project would have less than significant impact on the availability of known mineral and oil-based resources of value to the region or state residents and on any locally important mineral resource recovery sites.

 SECTION 4.12 – MINERAL RESOURCES 
7091/Allen Avenue Warehouse Project Page 4.12-5
Initial Study/Mitigated Negative Declaration January 2023 Figure 4.12-1

OIL AND GAS WELLS AND FIELDS

 SECTION 4.12 – MINERAL RESOURCES 
7091/Allen Avenue Warehouse Project Page 4.12-6
Initial Study/Mitigated Negative Declaration January 2023 Figure 4.12-2

GEOTHERMAL WEL

 SECTION 4.13 – NOISE 
7091/ Allen-Cataract Warehouse Project Page 4.13-1
Initial Study/Mitigated Negative Declaration January 2023

4.13 Noise
Would the project result in:

Potentially
Significant
Impact
Less than
Significant
Impact with
Mitigation
Incorporated
Less than
Significant
Impact
No Impact
a) 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?
X
b) Generation of excessive groundborne
vibration or groundborne noise levels? X
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.

 SECTION 4.13 – NOISE 
7091/ Allen-Cataract Warehouse Project Page 4.13-2
Initial Study/Mitigated Negative Declaration January 2023  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, 2013). 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 Sensitive Land Uses
The City of San Dimas Defines 'Noise Sensitive Areas' as "quiet zones of the city which contain activities more sensitive to noise than most activities. Existing quiet zones shall be considered noise sensitive areas until otherwise designated".

Sensitive receivers for short-term exposures are defined as schools, libraries, places of worship, and passive recreation uses. The principal sensitive receivers in the project vicinity are the single-family residences are along West Allen Avenue and Chaparral High School east of the project boundary.

Figure 4.13-1 shows the locations of the sensitive receivers. Table 4.13-1 identifies sensitive receivers in the project vicinity.

 SECTION 4.13 – NOISE 
7091/ Allen-Cataract Warehouse Project Page 4.13-3
Initial Study/Mitigated Negative Declaration January 2023 Figure 4.13-1

SENSITIVE RECEIVERS NEAR PROJECT SITE

 SECTION 4.13 – NOISE 
7091/ Allen-Cataract Warehouse Project Page 4.13-4
Initial Study/Mitigated Negative Declaration January 2023 Table 4-13-1

SENSITIVE RECEIVERS IN PROJECT AREA
ID Name Type Address Feet From
Sitea
1 Single-family Residence Residential 402 W Allen Ave. 414 2 Single-family Residence Residential 336 W Allen Ave. 160 3 Single-family residence Residential 308 W Allen Ave. 57 4 Single-family residence Residential 234 W Allen. 272
5 Chaparral High School Institutional W Allen & Monte Vista Ave. 720 aThese distances are from the sensitive receiver to the nearest point on the project boundary. They were not used in the noise exposue calculations.

4.13.4 Existing Noise
The project site is located in a predominantly industrial and residential area. The main source of ambient noise is traffic on Allen Avenue and Cataract Avenue, industrial operations, and noise from the I-210 freeway.

4.13.5 Ambient Noise Levels
UltraSystems Environmental Inc. conducted ambient noise sampling at five locations near the project site, as shown in Figure 4.13-2 and described in Table 4.13-1. Details of the ambient sampling methods and results are provided in Appendix I. The equipment used for obtaining these measurements is a Quest SoundPro DL-1-1/3.

Ten 15-minute samples (two per site) were taken between 8:39 a.m. and 4:02 p.m. on January 7, 2022. The 15-minute Leq values ranged from 62.4 to 66.9 dBA. The lowest of these values was measured at Point 3, which is located in front of a single-family residence along West Allen Avenue, and south of the project site. The maximum ambient noise level was located at Point 1, which is located in front of a single-family residence along West Allen Avenue, and west of the project site.

Table 4.13-1

AMBIENT NOISE MEASUREMENT RESULTS
Point Sampling Location
Measurement Results (dBA)
15-Minute Leq Lmax L90
1 402 West Allen Avenue, southwest of the
project area in a residential neighborhood

66.6 77.3 55.0
1a 65.7 80.3 53.2
2 336 West Allen Avenue, southwest of the
project area in a residential neighborhood

63.6 79.9 50.3
2a 66.9 83.8 53.6
3 308 West Allen Avenue, just south of the project
area.

62.4 79.6 48.5
3a 65.3 78.6 54.5
4 63.2 81.0 50.3

 SECTION 4.13 – NOISE 
7091/ Allen-Cataract Warehouse Project Page 4.13-5
Initial Study/Mitigated Negative Declaration January 2023 Point Sampling Location
Measurement Results (dBA)
15-Minute Leq Lmax L90
4a 234 West Allen Avenue, southeast of the project
area

66.7 80.7 54.6
5 West Allen Avenue & Monte Vista Avenue, east
of the project site

63.5 86.2 52.4
5a 64.2 84.9 53.3
Source: UltraSystems, with Google Earth, 2022.

 SECTION 4.13 – NOISE 
7091/ Allen-Cataract Warehouse Project Page 4.13-6
Initial Study/Mitigated Negative Declaration January 2023 Figure 4.13-2

AMBIENT SAMPLING POINTS

 SECTION 4.13 – NOISE 
7091/ Allen-Cataract Warehouse Project Page 4.13-7
Initial Study/Mitigated Negative Declaration January 2023

4.13.6 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 4.13-3.

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 the 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).

8.36.030 Fixed and mobile noise sources.

On or after the effective date of the ordinance codified in this chapter, unless a permit has been granted by the development plan review board, it is unlawful for any person to operate or cause to be operated, any single or combination fixed source or mobile source type of equipment or machinery, that individually or collectively constitute an identifiable noise source in such a manner as to cause the sound level at any point on the property line of any property to exceed the noise level

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Initial Study/Mitigated Negative Declaration January 2023 limits set forth in Section 8.36.040 of this chapter, however, that if all provisions of Section 8.36.11011 are complied with, this section shall not apply to construction equipment used in connection with construction operations. (Ord. 868 § 1, 1987).

8.36.040 Noise level limit.

The allowable noise level or sound level referred to in Section 8.36.030 shall be the higher of the following:

A. Actual measured ambient level; or
B. That noise level limit as determined from the following table:

Zone Time Sound level (A-weighted)
decibels
Residential - Low and
medium density
7 a.m. to 6 p.m.
6 p.m. to 10 p.m.

Night
50 45
40 Residential - High density
7 a.m. to 6 p.m.
6 p.m. to 10 p.m.

Night
60 55
50 Commercial
7 a.m. to 6 p.m.
6 p.m. to 10 p.m.

Night
60 55
50 Industrial
7 a.m. to 6 p.m.
6 p.m. to 10 p.m.

Night
70 60
55 If the measurement location is on a boundary between two different zones, the noise level limit applicable to the lower noise zone shall apply. (Ord. 868 § 1, 1987).

8.36.060 Maximum Permissible Sound Levels by Receiving Land Uses.

A. The noise standards for the various categories of land use identified in Section 8.36.040, shall, unless otherwise specifically indicated, apply to all property within a designated zone.

B. Except as otherwise permitted by this chapter no person shall operate or cause to be operated any source of sound at any location which causes the noise level when measured at any point on any other property, to exceed the limits set forth in Section 8.36.040 of this chapter.

C. If the measurement location is on a boundary between two different zones, the noise level limit applicable to the lower noise zone shall apply. (Ord. 868 § 1 (part) 1987)

8.36.100 Construction.

A. It is unlawful for any person within a residential zone, or within a radius of five hundred feet therefrom, to operate equipment or perform any outside construction or repair work on any building, structure or project, or to operate any pile driver, steam shovel, pneumatic hammer, steam or electric hoist or other construction-type equipment or device between the hours of eight p.m. of one day and 11 We believe that there is an error in § 8.36.030: it should refer to § 8.36.100.

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Initial Study/Mitigated Negative Declaration January 2023 seven a.m. of the next day, at any time on Sunday, or at any time on any public holiday in such a manner that a reasonable person of normal sensitivity residing in the area is caused discomfort or annoyance unless beforehand a permit therefor has been duly obtained in accordance with the provisions of subsection B of this section. No permit shall be required to perform emergency work. “Public holiday,” as used in this section, means the day upon which each of the following holidays is recognized and celebrated as a holiday by the employees of the city: Independence Day, Labor Day, Veteran’s Day, Thanksgiving Day, Friday after Thanksgiving, Christmas Eve, Christmas, New Year’s Eve, New Year’s, Washington’s Birthday, Memorial Day or any other holiday recognized as such by the city council.

B. A permit may be issued authorizing the work prohibited by this section whenever it is found that the public interest will be served thereby. An application for such a permit shall be in writing, shall be accompanied by an application fee in the amount of fifty dollars, or as from time to time an amount set by a resolution of the city council, and shall set forth in detail facts showing that the public interests will be served by the issuance of such permit. Such application shall be made to the building and safety division of the department of community development. The building official shall be responsible for the administration and enforcement of the provisions of this section and shall have the authority to issue such permits. He shall coordinate the processing of each application for a permit with such departments as he deems will be affected by the issuance of the permit. (Ord. 868 § 1, 1987)
Table 4.13-3

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

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Initial Study/Mitigated Negative Declaration January 2023

4.13.7 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. The proposed project would have a significant noise impact if it would do any of the following:
 Expose persons to or generate noise levels in excess of standards recommended in the City of San Dimas General Plan Noise Element.
 Include construction activities in or within 500 feet of residential areas between 8:00 p.m. of one day and 7:00 a.m. of the next day, without a permit.  Increase short-term noise exposures at sensitive receivers during construction by 5 dBA Leq or more.

Land Use Category Noise Exposure (dBA, CNEL)
55 60 65 70 75 80
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.

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Initial Study/Mitigated Negative Declaration January 2023  Contribute, with other local construction projects, to a significant cumulative noise impact.  Increase operational exposures at sensitive receivers (mainly because of an increase in traffic flow) by 5 dBA Leq or more.

4.13.8 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 with Mitigation Incorporated Construction activities, especially with heavy equipment operation, would create noise effects on and adjacent to the construction site. Long-term noise impacts include project-generated onsite and offsite operational noise sources. Onsite noise sources from the operation of the warehouse facility would include the use of mechanical equipment such as air conditioners and landscaping and building maintenance activities. Offsite noise would be attributable to project-induced traffic, which would cause an incremental increase in noise levels within and near the project vicinity. Each is described below.

This section also evaluates potential groundborne vibration that would be generated from the construction or operation of the proposed project.

Short-Term Construction Noise
Noise impacts from construction activities are a function of the noise generated by the operation of construction equipment and onroad delivery and worker commuter vehicles, the location of equipment, and the timing and duration of the noise-generating activities. Using calculation methods published by the Federal Transit Administration (FTA, 2006), UltraSystems estimated the average hourly exposures at the single-family residence nearest ambient noise measurement location 3. As will be discussed below, the blocking of the noise travel path by one or more intervening buildings was taken into account where applicable. The distances used for the calculation were measured from the residence to the approximate center of activity of each construction phase, since that would be the average location of construction equipment most of the time. For the purpose of this analysis, it was estimated that the construction of the proposed project would begin in May-June 2023 and end in March 2024.

The types and numbers of pieces of equipment anticipated in each phase of construction and development were estimated by running the California Emissions Estimator Model (CalEEMod), Version 2016.3.2 (BREEZE Software, 2017b), and having the model generate land use-based default values. The CalEEMod equipment default values are based on a construction survey performed by the SCAQMD (BREEZE Software, 2017a). Table 4.13-4 lists the equipment expected to be used. For each equipment type, the table shows an average noise emission level (in dB at 50 feet, unless otherwise specified) and a “usage factor,” which is an estimated percentage of operating time that

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Initial Study/Mitigated Negative Declaration January 2023 the equipment would be producing noise at the stated level.12,13 Equipment use was matched to phases of the construction schedule.

During each construction phase the line of sight between some sensitive receivers and construction noise sources will be substantially blocked by existing buildings. The effects of the shielding were taken into account according to Caltrans guidance (Caltrans, 2013, p. 2-35). The noise attenuation from intervening buildings ranged from none to 5 dBA.

Table 4.13-4

CONSTRUCTION EQUIPMENT NOISE CHARACTERISTICS
Results of the construction noise calculations are presented in Table 4.13-5. The most noise generating construction phase would be building construction for Unit 1, which would result in a maximum hourly Leq of 77.4 dBA (ambient plus contribution from construction) across West Allen Avenue from the project site. The City of San Dimas Municipal Code does not contain standards with which to compare these results.
12 Equipment noise emissions and usage factors are from Knauer, H. et al., 2006. FHWA Highway Construction Noise Handbook. U.S. Department of Transportation, Research and Innovative Technology, Administration, Cambridge, Massachusetts, FHWA-HEP-06-015 (August 2006), except where otherwise noted. 13 Scraper, crane, and cement and mortar mixer, and roller noise emissions data from County of Ventura, Construction Noise Threshold Criteria and Control Plan. Amended July 2010. This document was also source of usage factors for cranes, cement and mortar mixers, pavers, paving equipment and rollers. Rubber tired dozer noise emissions data from measurements made by Anderson (2007, p. 47) at construction sites.

Construction
Phase Equipment Type No. of Pieces
Combined
Sound Level
@ 50 feet
(dBA Leq)
Usage
Factor
Demolition Tractors/Loaders/Backhoes 1 80.68 0.37
Site Preparation Tractors/Loaders/Backhoes 1 80.68 0.37 Grading
Excavators 1

84.76 0.38
Graders 1 0.41
Off-Highway Trucks 1 0.38
Tractors/Loaders/Backhoes 1 0.37
Building
Construction
Cement and Mortar Mixers 4

87.53 0.56
Cranes 1 0.29
Forklifts 2 0.2
Utility Trenching
and Installation Tractors/Loaders/Backhoes 1 80.68 0.37 Landscaping Tractors/Loaders/Backhoes 1 80.68 0.37
Paving
Cement and Mortar Mixers 1

84.56 0.56
Plate Compactors 1 0.43
Rollers 1 0.38
Tractors/Loaders/Backhoes 1 0.37
Architectural
Coating Aerial Lifts 1 68.01 0.31

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Initial Study/Mitigated Negative Declaration January 2023 Table 4.13-5

ESTIMATED MAXIMUM INCREASES IN NOISE EXPOSURE AT NEAREST SENSITIVE RECEIVERS Receiver Ambient
dBA Leq
Construction
dBA Leq
New Total
dBA Leqa
Increase
dBA Leq
1 – 402 West Allen Avenue 66.2 66.1 69.2 3.0
2 – 336 West Allen Avenue 65.6 66.9 69.3 3.7
3 – 308 West Allen Avenue 64.1 77.2 77.4 13.3
4 – 234 West Allen Avenue 65.3 69.4 70.8 5.5
5 – 121 West Allen Avenue 63.9 63.1 66.5 2.6
6 – 337 West Allen Avenue 65.6 70.9 72.0 6.4
aNoise attenuation from intervening buildings taken into account where applicable.

The increase due to project construction at 308 West Allen Avenue would be 13.3 dBA Leq, which would be greater than 5 dBA. Increase at two other sensitive receivers would also exceed 5 dBA Leq.

Therefore, short term unmitigated impacts would be significant. However, with implementation of mitigation measures N-1 and N-2, impacts would be reduced to a less than significant level.

Mitigation Measures
MM N-1 The construction contractor will use the following source controls when working within 600 feet of occupied residential buildings:
 Use of noise-producing equipment will be limited to the interval from 7:00 a.m. to 6:00 p.m. on weekdays, 8:00 a.m. to 5:00 p.m. on Saturdays, with no construction on Sundays.
 For all noise-producing equipment, use types and models that have the lowest horsepower and the lowest noise generating potential practical for their intended use.
 The construction contractor will ensure that all construction equipment, fixed or mobile, is properly operating (tuned-up) and lubricated, and that mufflers are working adequately.
 Have only necessary equipment onsite.
 Use manually-adjustable or ambient-sensitive backup alarms.

MM N-2 When working near adjacent residential uses, the construction contractor will also use the following path controls, except where not physically feasible, when needed:

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Initial Study/Mitigated Negative Declaration January 2023  Install portable noise barriers, including solid structures and noise blankets, between the active noise sources and the nearest noise receivers.  Temporarily enclose localized and stationary noise sources.  Store and maintain equipment, building materials, and waste materials as far as practical from as many sensitive receivers as practical.

Operational Noise
Onsite
Onsite noise sources from the proposed warehouse facility would include operation of rooftop mechanical equipment such as air conditioners, parking lot activities, and truck deliveries. Noise levels from these sources are generally lower than from the traffic on streets bordering the project site. Finally, most of the noise from onsite truck traffic, engine idling, and loading and unloading will be within a recess in the west side of the proposed warehouse; the structure will block the line of sight to sensitive receivers on the south.14 The operational noise levels would be within both the City’s daytime and nighttime residential noise standards of 70 dBA and 65 dBA, respectively.

Therefore, operational noise would be less than significant.

For due diligence, the analysis included calculating noise from trucks entering and leaving the facility.

The transportation assessment memorandum for this project (Núñez et al., 2022, Table 1) estimates that the maximum daily traffic (on a weekday)15 would be 109 vehicles, of which 22 would be trucks.

Assuming uniform hourly traffic, the average hourly onsite traffic would be 1.83 trucks.16 The average hourly noise exposure for a given number of individual arrivals is (FTA, 2018, p. 44):

Leq = SEL + 10 log(V) + CS log(S/50) – 35.6
where
SEL = sound exposure level of one vehicle17
V = number of vehicles per hour
CS = speed constant (assumed to be 15 for diesel trucks) S = average vehicle speed, miles per hour (assumed to be 5 miles per hour onsite) No information on SEL values for diesel trucks was publicly available. A typical noise exposure level for a heavy-duty diesel truck at 50 feet and moving at 50 miles per hour is about 82 dBA (FHWA, 2019, p. 69). This is the same as the SEL for a diesel bus (FTA, 2018, p. 78). It is reasonable, for the purpose of this analysis, to use 82 dBA for the trucks. Therefore, for 1.83 vehicles per hour, Leq would be 34.0 dBA at 50 feet. Increases in Leq at the closest residence would essentially be undetectable.

Noise impacts from onsite truck activity would be less than significant. 14 No sensitive receivers are west of the project site. 15 Warehouse plus office building.
16 In the absence of specific information we are assuming 12 hours per day of operation. 17 The sound exposure level (SEL) is equivalent to the total sound energy experienced during a measurement period, as if it had all occurred in one second.

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Initial Study/Mitigated Negative Declaration January 2023 Mobile Sources
The principal noise source in the project area is traffic on local roadways and the I-210 freeway. The project may contribute to a permanent increase in ambient noise levels in the project vicinity due to project-generated vehicle traffic on nearby roadways, freeways and at major intersections.

As noted above, the proposed project would generate an estimated 109 new daily vehicle trips (ADT).

Existing roadway segment average daily traffic (ADT) data were obtained from the City of San Dimas 24 hours Traffic Count 2017. ADT along West Allen Avenue, which is where the single-family residence sensitive noise receivers nearest the project are, is 7,841 trips per day (City of San Dimas Traffic Count, 2017). The project would increase traffic by about 1.4%. Given the logarithmic nature of the decibel, traffic volume needs to be doubled in order for the noise level to increase by 3 dBA (ICF Jones & Stokes, 2009), the minimum level perceived by the average human ear. A doubling is equivalent to a 100% increase. Since the maximum increase in traffic in this road segment would be far below 100%, the increase in roadway noise experienced at sensitive receivers would not be perceptible to the human ear. Therefore, roadway noise associated with project 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).

Construction Vibration
Construction activities for the project have the potential to generate low levels of groundborne vibration. The operation of construction equipment generates vibrations that propagate though the ground and diminishes in intensity with distance from the source. Vibration impacts can range from no perceptible effects at the lowest vibration levels, to low rumbling sounds and perceptible vibration

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Initial Study/Mitigated Negative Declaration January 2023 at moderate levels, to slight damage of buildings at the highest levels. The construction activities associated with the project could have an adverse impact on both sensitive structures (i.e., building damage) and populations (i.e., annoyance).

The construction vibration analysis used formulas published by the Federal Transit Administration (FTA) (FTA, 2018, p. 185). For a standard reference distance of 25 feet, peak particle velocity is found from:

PPV = PPVref x (25/D)1.5
where
PPVref = Reference source vibration at 25 feet
D = Distance from source to receiver
The vibration level (VdB) for a standard reference distance of 25 feet is found from:

VdB = Lvref – 30 log(D/25)
where
Lvref = Reference source vibration level at 25 feet
D = Distance from source to receiver
The FTA has published standard vibration levels for construction equipment operations, at a distance of 25 feet (FTA, 2006, p. 12-12). The smallest distance from project construction activity to a residential receiver would be about 105 feet. The calculated vibration levels expressed in VdB and PPV for selected types of construction equipment at distances of 25 and 105 feet are listed in Table 4.13-6.

As shown in Table 4.13-6, the vibration level of construction equipment at the nearest sensitive receiver is at most 0.0184 inch per second, which is less than the FTA damage threshold of 0.12 inch per second PPV for fragile historic buildings, and 68 VdB, which is less than the FTA threshold for human annoyance of 80 VdB. Vibration impacts would therefore be less than significant.

Table 4.13-6

VIBRATION LEVELS OF CONSTRUCTION EQUIPMENT
Equipment
PPV
at 25 feet
(in/sec)
Vibration
Decibels
at 25 feet
(VdB)
PPV
at 105 feet
(in/sec)
Vibration
Decibels
at 105 feet
(VdB)
Loaded trucks 0.076 86 0.0157 67
Small bulldozer 0.003 58 0.000619 39
Large bulldozer 0.089 87 0.0184 68
Sources: Data at 25 feet from (FTA, 2006, p. 12-12); calculations by UltraSystems.

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Initial Study/Mitigated Negative Declaration January 2023 Operational Vibration
Groundborne vibrations at the project site and immediate vicinity currently result from heavy-duty vehicular travel (e.g. freight trucks) on the nearby local roadways, and the project would not result in a substantial increase of these heavy-duty vehicles on the public roadways. Therefore, vibration impacts associated with operation of the project 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 the Brackett Field Airport, located in La Verne, approximately two miles southeast of the project site. It is owned and managed by the County of Los Angeles. At the current level of activity, the impact of Brackett Airport flight operations is not considered significant in existing residential areas in San Dimas (City of San Dimas, General Plan Noise Element, 1991, p. VIII13). Therefore, the project would not expose people residing or working in the project area to excessive noise levels and no impact would occur.

 SECTION 4.14 – POPULATION AND HOUSING 
7091/ Allen-Cataract Warehouse Project Page 4.14-1
Initial Study/Mitigated Negative Declaration January 2023

4.14 Population and Housing
Would the project:

Potentially
Significant
Impact
Less than
Significant
Impact with
Mitigation
Incorporated
Less than
Significant
Impact
No
Impact
a) Induce substantial unplanned population
growth in an area, either directly (for example,
by proposing new homes and businesses) or
indirectly (for example, through the extension
of roads or other infrastructure)?
X
b) Displace substantial numbers of existing
people or housing, necessitating the
construction of replacement housing
elsewhere?
X
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 the extension of roads or other infrastructure)? Less than Significant Impact
Existing and forecasted demographic data for the City of San Dimas for 2021 and 2045 are shown below in Table 4.14-1. The population of the cCty of San Dimas is forecast to increase by approximately 1,000, or 3%, between 2021 and 2045, and employment in the city is forecast to increase by 1,400, or 12 percent between 2016 and 2045. The number of households in the city is expected to remain approximately even over the 2021-2045 period.

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 4.14-2.

Table 4.14-1

CITY OF SAN DIMAS DEMOGRAPHIC FORECAST
2021 2045 Difference
(2045 – 2021)
Percent
Difference
(2045 – 2021)
Population 34,064 35,000 997 2.9%
Households 12,100 12,300 200 1.7%
Employment 11,500 12,900 1,400 12.2%
Sources: CDF, 2021; SCAG, 2020; US Census, 2022

 SECTION 4.14 – POPULATION AND HOUSING 
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Initial Study/Mitigated Negative Declaration January 2023 Table 4.14-2

CITY OF SAN DIMAS DEMOGRAPHIC ESTIMATES
Assuming achievement of Regional Housing Needs Assessment allocation, 2021-2029 2021 2029 Difference,
2029 - 2021
Percent Difference,
2029 - 2021
Population 34,003 37,460 3,457 10.2%
Households 12,289 13,537 1,248 10.2%
Sources: CDF, 2021; SCAG, 2020; US Census, 2022
The project proposes the development of a warehouse and does not propose the construction of any residential uses, or extension of existing infrastructure. Project development would not cause direct population growth impacts.

Project development would involve the demolition of the nine (9) residential units on site. The units are currently vacant; thus, demolition would not require the construction of replacement housing to house the current residents of those units. However, the demolition could still have a small adverse impact on the housing supply in the City of San Dimas. In 2021 an estimated 525 housing units in the city were vacant, for a vacancy rate of 4.1% (CDF, 2021). Project impacts on housing in San Dimas would be less than significant.

Project operation is estimated to generate 65 jobs, and project construction would generate a small number of temporary jobs. Project employment generation would be within the estimated 1,200 employment growth in the city between 2016 and 2045. The unemployment rate in Los Angeles County in July 2022 was 4.9 percent (EDD, 2022); therefore, it is expected that project-generated employment would be absorbed from the regional labor force and would not attract workers from outside of the region. Thus, indirect population growth impacts related to new jobs created by the project would be less than significant.
b) Would the project displace substantial numbers of existing people or housing, necessitating the construction of replacement housing elsewhere? Less than Significant Impact
The project proposes a warehouse facility on an approximately 2.58-acre site and does not propose the construction of any residential uses, nor does it include an extension of existing infrastructure.

Project development would not cause direct population growth impacts. Project development would involve the demolition of the nine (9) residential units on site. The units are vacant; thus, demolition would not require the construction of replacement housing to house the current residents of those units. However, the demolition could still be a small adverse impact on the housing supply in the City of San Dimas. In 2021 an estimated 525 housing units in the city were vacant, for a vacancy rate of

4.1 percent (CDF, 2021). The regional projection shown above in Table 4.14-1 is that approximately 200 households will be added to the city between 2021 and 2045. However, the City of San Dimas Draft 2021-2029 Housing Element sets forth the Regional Housing Needs Assessment for the city of 1,248 units, including 604 units for households with incomes below 80% of the area median family income (City of San Dimas, 2022, p. 4-2). Therefore, project impacts on housing in San Dimas would be less than significant.

 SECTION 4.15 – PUBLIC SERVICES 
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Initial Study/Mitigated Negative Declaration January 2023

4.15 Public Services
Would the project:

Potentially
Significant
Impact
Less than
Significant
Impact with
Mitigation
Incorporated
Less than
Significant
Impact
No
Impact
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? X
b) Police protection? X
c) Schools? X
d) Parks? X
e) Other public facilities? X
a) Fire Protection?
Less than Significant Impact
Fire prevention, fire protection, and emergency response services for the City of San Dimas are provided by Los Angeles County Fire Department (LACFD). There are two fire stations in San Dimas, serving a population of 34,334 people in an area of 16 square miles, which calculates to one fire station per 17,167 people, and one fire station per seven square miles. The County of Los Angeles Fire Department as a whole is serving a population of 9,829,544 people in an area of 4,029 square miles, which calculates to an average of one fire station per 56,189 people in an average area of 23 square miles (US Census, 2022).

Station 64, Battalion 2 Headquarters, is located at 164 S. Walnut Avenue, and Station 141 is located at 1124 W Puente Street. Fire Station#64 is located approximately 1.4 miles southwest of the project site. LACFD provides fire protection and emergency response services to the San Dimas community with a mission to prevent the loss of life and property. In addition to responding to calls for fire suppression, LACFD responds to medical emergencies, incidents involving hazardous materials, rescue calls, and motor vehicle or other accidents (LACFD, 2022).

The project proposes a two-unit warehouse building totaling 63,749 square feet on two levels. Travel time to the project site from Station 64 is approximately five minutes. Therefore, the response time for the closest fire station to the project site would be within the LACFD goal of having a six-minute response time.

The project site is not located in a Very High Fire Hazard Severity Zone (CAL FIRE, 2008, and CAL FIRE, 2020). The project would comply with applicable portions of the City of San Dimas Municipal Code. The project would also be consistent with the 2016 edition of the California Residential Code (CRC), Section 237; and the 2018 edition of the International Fire Code (IFC), as adopted and amended by the Fire District.

 SECTION 4.15 – PUBLIC SERVICES 
7091/ Allen-Cataract Warehouse Project Page 4.15-2
Initial Study/Mitigated Negative Declaration January 2023 Furthermore, the adequacy of existing water pressure and water availability in the project area would be verified by the LACFD during the proposed project’s plan check review process. Compliance with the above-mentioned codes and standards is mandatory and routinely conditioned upon projects. The project, once operational, would be inspected periodically by the LACFD.

Development of the project site would be consistent with the land use goals and strategic policy map included in the City of San Dimas’s General Plan and has therefore been planned for, from the standpoint of long-term infrastructure needs (San Dimas, 2022).

The project’s demands on fire protection services would have a less than significant impact. b) Police Protection?
Less than Significant Impact
Police protection and law enforcement services (San Dimas Sheriff’s Department, SDSD) in the City of San Dimas are provided by the Los Angeles County Sheriff’s Office. The nearest police station to the project site is located at 270 S Walnut Ave, approximately one mile southeast of the project site.

The San Dimas Station is the central location for 18 Patrol Deputies, one Motorcycle Reserve Deputy, three CAT Team Leaders, three Special Assignment Officers (CAT Team), one Team Sergeant, two Community Service Assistants, one Law Enforcement Technician (Crime Prevention Officer), and one School Resource Officer. Given the estimated population of 34,064 in 2021 (US Census, 2022), San Dimas has an approximate service-to-population ratio of one sworn officer per 1,144 residents (1.14 sworn officers per 1,000 residents). This is slightly higher than the Los Angeles County average of 0.9 sworn officers per 1,000 residents (LASD, 2022).

The residential population is not expected to increase as a result of the proposed project. While the project would create limited employment opportunities (both during the construction and operational phases), it is anticipated that employees from the local workforce would be hired during both phases. The project is not of the scope or scale to induce people to move from out of the project area to work on the proposed project. Therefore, the ratio of sworn officers to residents is not expected to change.

Moreover, the development of the project site is consistent with the overall growth anticipated by the General Plan at buildout and has therefore been planned for from the standpoint of long-term infrastructure needs. The project would not result in a substantial increase in the population and housing in the surrounding area, nor is it expected to significantly affect the existing service capacity of the San Dimas Police Department. Therefore, less than significant impacts on police protection services would occur.
c) Schools?
No Impact
The project site is located within the Bonita Unified School District (BUSD). BUSD provides public education for approximately 10,000 students and includes eight Grade K-5 schools, two Grade 6-8 schools, three Grade 9-12 schools, one Grade K-12 school, and one Adult Education school, (NCES, 2022). The demand for schools is generally triggered by an increase in population or new residential uses. The project does not propose any new residential uses. Therefore, no impact on schools would occur.

 SECTION 4.15 – PUBLIC SERVICES 
7091/ Allen-Cataract Warehouse Project Page 4.15-3
Initial Study/Mitigated Negative Declaration January 2023 d) Parks?
Less than Significant Impact
Recreational services in the City of San Dimas are managed by the Landscape Maintenance Divisions 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 (City of San Dimas, 2022).

The parks nearest to the project include Merchant Park, located approximately 0.75 miles southeast of the project site, and Civic Center Park, approximately 0.75 miles south of the project site as shown in Figure 4.16-1. It is possible that employees at the project site may visit these parks; however, the potential impact of these visits on parks would be less than significant.

The project does not propose residential land uses and is not anticipated to add new residents to the city. It is possible that employees at the project site may visit nearby parks, but the potential impact of these visits on parks would be less than significant. e) Other Public Facilities?
No Impact
The San Dimas Library is part of the Los Angeles County Library System, which is comprised of 72 branch libraries. The San Dimas Library is the only library within the City of San Dimas located at 145 Walnut Avenue. The project is not of the scope or scale to induce any population growth. Therefore, the project would have no impact on libraries or other public facilities.

 SECTION 4.16 – RECREATION 
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Initial Study/Mitigated Negative Declaration January 2023

4.16 Recreation
Would the project:

Potentially
Significant
Impact
Less than
Significant
Impact with
Mitigation
Incorporated
Less than
Significant
Impact
No
Impact
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?
X
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?
X
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?
Less Than Significant 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 fourteen City-operated recreational facilities, which include twelve parks, a Swim and Racquet Club, and the Sportsplex (City of San Dimas, 2022). 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. The City currently has approximately 137.5 acres total in parks for public use.

The project proposes a two-unit warehouse building totaling 63,749 square feet on two levels. The residential population is not expected to increase as a result of the proposed project. While the project would create limited employment opportunities (both during the construction and operational phases), it is anticipated that employees from the local workforce would be hired during both phases. Moreover, the land uses nearest to the project site are primarily light manufacturing.

The parks nearest to the project include Merchant Park, located approximately 0.75 miles southeast of the project site, and Civic Center Park also located approximately 0.75 miles south of the project site as shown in Figure 4.16-1. It is possible that employees at the project site may visit these parks; however, the potential impact of these visits on parks would be less than significant. 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?

 SECTION 4.16 – RECREATION 
7091/ Allen-Cataract Warehouse Project Page 4.16-2
Initial Study/Mitigated Negative Declaration January 2023 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.

 SECTION 4.16 – RECREATION 
7091/ Allen-Cataract Warehouse Project Page 4.16-3
Initial Study/Mitigated Negative Declaration January 2023 Figure 4.16-1

PARKS AND RECREATION

 SECTION 4.17 – TRANSPORTATION 
7091/ Allen-Cataract Warehouse Project Page 4.17-1
Initial Study/Mitigated Negative Declaration January 2023

4.17 Transportation
Would the project:

Potentially
Significant
Impact
Less than
Significant
Impact with
Mitigation
Incorporated
Less than
Significant
Impact
No
Impact
a) Conflict with a program plan,
ordinance, or policy addressing the
circulation system, including transit,
roadway, bicycle, and pedestrian
facilities?
X
b) Conflict or be inconsistent with CEQA
Guidelines section 15064.3,
subdivision (b)?
X
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
d) Result in inadequate emergency
access? X
The analysis below is based on the Transportation Assessment Memorandum for the Allen/Cataract Warehouse Project that was conducted by Fehr & Peers (refer to Appendix G). The trip generation assessment estimated trip generation using trip generation rates for the fully built project. An existing use credit was taken for the entire site using the ITE trip generation rate for the nine vacant single-family homes (ITE Code 210). Accounting for the conversion of estimated truck trips into passenger car equivalent (PCE) rates, the Project is expected to generate an estimated net new 64 daily trips, including 10 trips during the AM peak hour and eight trips during the PM peak hour. (Fehr & Peers)
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 and County plan ordinances and policies would apply to the project; San Dimas General Plan Circulation Element
Goal 1 is to provide a street network to move people and goods safely and efficiently throughout the City of San Dimas.

The project proposes an industrial land use in the form of a warehouse and will not remove sidewalks along the frontage of the project site. The project will support this goal by reducing the number of driveways from nine existing access points to two. This would reduce the number of conflict points between transportation modes on project site frontages. Sidewalks currently do not exist on the west side of Cataract Avenue, and the project would install new sidewalks along its frontage. The project

 SECTION 4.17 – TRANSPORTATION 
7091/ Allen-Cataract Warehouse Project Page 4.17-2
Initial Study/Mitigated Negative Declaration January 2023 also does not preclude the City of San Dimas from implementing a safer and more efficient street network.

Goal 2 is to promote a public transportation system that is safe, convenient, efficient and meets the identified needs of the City of San Dimas.

There are no fixed-route transit services along Allen Avenue and Cataract Avenue and the project does not preclude the implementation of this goal or the expansion of transit service in the vicinity of the project site.

Goal 3 is to promote safe alternatives to motorized transportation that meet the needs of all City residents.

The project will not remove sidewalks along the frontage of the project site but will reduce the number of driveways along Allen Avenue and Cataract Avenue, which should improve the safety of pedestrians using the sidewalks on the project site frontages by reducing the number of driveways where vehicle/pedestrian conflicts could occur. There are no sidewalks currently existing along the west side of Cataract Avenue and the project proposes to install new sidewalks along this frontage.

The project will also provide four short-term bicycle parking spaces.

The project will not conflict with a program plan, ordinance, or policy addressing the circulation system, and thus no impacts are anticipated.
b) Would the project conflict or be inconsistent with CEQA Guidelines section 15064.3, subdivision (b)?
Less than Significant Impact
Section 15064.3, Determining the Significance of Transportation Impacts, of the CEQA Guidelines describes specific considerations for evaluating a project’s transportation impacts. Section 15064.3(b) includes criteria for analyzing transportation impacts. Vehicle miles traveled (VMT) which focuses on the overall miles traveled by vehicles within a region, is the new metric for transportation analysis and replaces automobile delay (Level of Service -LOS), which is no longer used as a criterion for determining a significant environmental effect under CEQA. For land-use projects, “Vehicle miles traveled (VMT) exceeding an applicable threshold of significance may indicate a significant impact.” (CEQA Guidelines § 15064.3).

In anticipation of the change to VMT, the San Gabriel Valley Council of Governments (SGVCOG) undertook the SGVCOG SB 743 Implementation Study to assist with answering important implementation questions about the methodology, thresholds, and mitigation approaches for VMT impact analysis in its member agencies. The study includes the following main components.

1. Analysis Methodologies Memorandum – Identification of potential thresholds that can be considered when establishing thresholds of significance for VMT assessment and recommendations of analysis methodologies for VMT impact screening and analysis

2. Mitigation Memorandum – Types of mitigation that can be considered for VMT mitigation

3. VMT Assessment Tool – A web-based tool that can be used for VMT screening and mitigation recommendation

 SECTION 4.17 – TRANSPORTATION 
7091/ Allen-Cataract Warehouse Project Page 4.17-3
Initial Study/Mitigated Negative Declaration January 2023 The City of San Dimas utilized the information produced through the Implementation Study to adopt a methodology and significance thresholds for use in CEQA compliance, as noted in CEQA Guidelines Section 15064.7(b). The City has produced the Transportation Study Guidelines to outline the specific steps for complying with the new CEQA expectations for VMT analysis and the applicable general plan consistency requirements related to the Level of Service (LOS). The City of San Dimas City Council adopted the City’s VMT approach on October 27, 2020. (City of San Dimas Transportation Study Guidelines, May 2021)
Consistent with the Governor’s Office of Planning and Research Technical Advisory18, the City of San Dimas adopted guidance that applies three screening criteria to identify if a proposed project is presumed to cause a less-than-significant VMT impact:

1. Project accessibility to transit: The proposed project does not meet this criterion because there are no fixed-route transit services within 0.5 miles of the project site that meet the requirements for applying transit screening.

2. Project location in a low VMT area: The proposed project does not meet this criterion per analysis using the SGVCOG VMT Evaluation Tool. As described in the City’s Transportation Study Guidelines, this tool is used to verify the applicability of this screening and the analysis result has shown it is not located in a low VMT area.

3. Project Type and projects that generate fewer than 110 net new daily trips: The Project does meet Criteria 3, as it will only generate 64 net new daily trips. Therefore, according to the City of San Dimas Transportation Study Guidelines and OPR guidance, the project can be considered to have a less-than-significant impact on VMT due to its estimated trip generation, and no further VMT analysis is required.

Therefore, the project would not conflict with CEQA Guidelines section 15064.3, subdivision (b) and project impacts related to VMT would be less than significant. 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)?
Less than Significant Impact
The Project will not remove sidewalks along the frontage of the project site but will reduce the number of driveways along Allen Avenue and Cataract Avenue, which should improve the safety of pedestrians using the sidewalks on the project site frontages by reducing the number of driveways where vehicle/pedestrian conflicts could occur. There are no sidewalks currently existing along the west side of Cataract Avenue and the project proposes to install new sidewalks along this frontage.

The project will also provide four short-term bicycle parking spaces.

Commercial and business vehicles would access the facility via the driveways along Cataract Avenue and Allen Avenue. An approximately 30-foot wide fire lane is provided along the northern and western sides of the proposed building. A protected pedestrian path of travel from the public rightof-way to the building will be provided via the walkways along Cataract Avenue on the northeast and 18 The Governor’s Office of Planning and Research Technical Advisory, CEQA Exemptions Outside of the CEQA Statue, https://opr.ca.gov/ceqa/docs/20180606-Tech_Advisory_CEQA_Exemptions.pdf

 SECTION 4.17 – TRANSPORTATION 
7091/ Allen-Cataract Warehouse Project Page 4.17-4
Initial Study/Mitigated Negative Declaration January 2023 Allen Avenue on the southwest. All onsite access and sight-distance setbacks would be in accordance with the City of San Dimas and Caltrans design requirements. The project would not substantially alter or impact roads, sightlines or offsite land uses. The proposed project would not house or utilize farm equipment, construction equipment, or other unusually slow vehicles that would present a traffic hazard. Therefore, the project would not increase hazards due to a geometric design feature, and traffic hazard impacts would be less than significant. d) Would the project result in inadequate emergency access? Less than Significant Impact
Construction
During the project construction phase, lanes and sidewalks may be temporarily closed off. To ensure that circulation and emergency access during construction are adequate, the City requires the application for and approval of a Public Works Encroachment Permit for all projects that require construction in the public right-of-way. The Engineering Division reviews and inspects development proposals and compliance with city policies, procedures, codes, standards, and other governmental requirements relating to public improvement within the city right-of-way and transportation matters. Based on the approval of the Public Works Encroachment Permit, during construction, the project will have less than significant impact on emergency access.

Operation
The project would comply with applicable City regulations, such as the requirement to comply with the City’s Fire Code concerning providing adequate emergency access, as well as the California Building Standards Code. Prior to the issuance of building permits, the City of San Dimas would review project site plans, including the location of all buildings, fences, access driveways, and other features that may affect emergency access. Fire lanes would be provided for adequate emergency access. The site design for the proposed project includes access and fire lanes that would accommodate emergency ingress and egress by fire trucks, police units, and ambulance/paramedic vehicles. All onsite access and sight-distance requirements would be in accordance with the City’s and Caltrans design requirements. The City’s review process and compliance with applicable regulations and standards would ensure that adequate emergency access would be provided at the project site at all times. Therefore, the proposed project would not result in inadequate emergency access and there would be no impacts in this regard.

 SECTION 4.18 – TRIBAL CULTURAL RESOURCES 
7091/ Allen-Cataract Warehouse Project Page 4.18-1
Initial Study/Mitigated Negative Declaration January 2023

4.18 Tribal Cultural Resources
Would the project:

Potentially
Significant
Impact
Less than
Significant
Impact with
Mitigation
Incorporated
Less than
Significant
Impact
No
Impact
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
section 5020.1(k)?
X
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.

X

4.18.1 Methods
Information from the Phase I Cultural Resources Inventory Report, dated January 22, 2023 (see Appendix D1), prepared by UltraSystems for the Allen / Cataract Warehouse Project has been used to prepare the analysis in this section.

The cultural resources report describes the research for and analysis of potential cultural resources data conducted for the project. This research included cultural resources record search at 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. The cultural resources record search at the SCCIC indicated no prehistoric resources recorded within the project boundary.

Previous prehistoric cultural resources surveys within the 0.5-mile radius resulted in no prehistoric archaeological sites or isolates being recorded. The cultural resource study findings at the SCCIC suggest that there is a low potential for finding prehistoric resources.

 SECTION 4.18 – TRIBAL CULTURAL RESOURCES 
7091/ Allen-Cataract Warehouse Project Page 4.18-2
Initial Study/Mitigated Negative Declaration January 2023 One potential resource (as defined by Public Resources Code § 21074) has been noted (refer to “NAHC Sacred Land File Records Search” in Appendix D1 of this IS/MND). A Traditional Cultural Resource (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 ten tribal contacts provided by the NAHC.

However, neither the Gabrielino – Kizh Nation nor any of the other local tribal organizations responded with information regarding this SLF resource. 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 CRHR or local historical registers as defined in Public Resources Code section 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 with Mitigation Incorporated 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 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 either (1) the parties

 SECTION 4.18 – TRIBAL CULTURAL RESOURCES 
7091/ Allen-Cataract Warehouse Project Page 4.18-3
Initial Study/Mitigated Negative Declaration January 2023 agree to mitigation measures (MMs) 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 compliance with AB 52, letters were sent by the City of San Dimas’ Community Development Department (City) to all applicable Native American Tribes. Anne Nguyen, Associate Planner with the Community Development Department, has taken the lead for this process. The letters were sent July 21, 2022 by certified mail to the following tribes:
 Gabrieleno Band of Mission Indians – Kizh Nation,
 Gabrieleno/Tongva San Gabriel Band of Mission Indians,  Torres-Martinez Desert Cahuilla Indians
 Soboba Band of Luiseño Indians
The City received a reply from the Gabrieleno – Kizh Nation on July 25, 2022 by email with an attached letter requesting consultation. Ms. Nguyen responded to the Gabrieleno – Kizh Nation requesting an available date and time for consultation. A consultation teleconference call between the City and the Gabrieleno – Kizh Nation was conducted August 18, 2022. The Kizh Nation provided a letter and suggested mitigation measures on September 12, 2022. Ms. Nguyen provided revisions to the Gabrieleno – Kizh Nation suggested mitigation measures. The City received a reply by the Gabrieleno – Kizh Nation on October 26, 2022 by email with an attached letter requesting the suggested mitigation measures provided on September 12, 2022 be incorporated as is without any changes. An additional consultation teleconference call between the City and the Gabrieleno – Kizh Nation was conducted on November 9, 2022. Ms. Nguyen eliminated some of the changes that were made to the Gabrieleno – Kizh Nation suggested mitigation measures. Following review by Ms.

Nguyen and the San Dimas City’s attorney, it was determined that the Kizh Nation suggested mitigation measures would be incorporated as applies only to the Gabrielino - Kizh Nation if they are chosen as the Native American monitors for the project and, should human remains be discovered and if the NAHC should chose the Kizh Nation to be the Most Likely Descendants (MLD). Following review of the recommended mitigation measure language from the City, the Kizh Nation approved it via email from their Admin Specialist on January 9, 2023 and consultation with the Gabrielino - Kizh Nation was concluded (A. Nguyen, personal communication; January 9, 2023).

The remaining three tribes did not reply to the City within the 30-day response period nor have they to date. With this, AB 52 consultation has been concluded (except the continued discussions with the Gabrielino – Kizh Nation described above) (A. Nguyen, personal communication; September 15, 2022).

A potential resource as defined by Public Resources Code § 21074 has been noted (Attachment C:
“NAHC Sacred Land File Records Search” in Appendix D1 to this Initial Study). During UltraSystems’ cultural resources study, outreach to the NAHC determined that 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 that UltraSystems contact the Gabrielino Band of Mission Indians – Kizh Nation to learn further information about the SLF site. A letter was sent to Gabrielino-Kizh Nation on November 2, 2021 asking about the SLF site (Appendix D1). An email was received on November 19, 2021 from Admin Specialist Monica Cano of the Gabrieleno Band of Mission Indians – Kizh Nation, indicating that the project location is within their Ancestral Tribal Territory and that the Tribal Government requests to schedule a consultation with UEI as the lead agency. Mr. O’Neil responded on the same day indicating that our letter was in regards to the cultural resources study to inform you of the project and not AB 52 consultation. Ms. Cano

 SECTION 4.18 – TRIBAL CULTURAL RESOURCES 
7091/ Allen-Cataract Warehouse Project Page 4.18-4
Initial Study/Mitigated Negative Declaration January 2023 responded on the same day that this email was being forwarded to “Anne” (No last name provided).

There was no further response from the Gabrielino – Kizh Nation to UltraSystems regarding the SLF site.

No prehistoric archaeological resources were observed during the field survey. The previous cultural resources surveys within the 0.5-mile radius resulted in no archaeological sites or isolates being recorded. During the cultural resources record search at the SCCIC, no prehistoric resources were found. 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 prehistoric resources.

Mitigation for minimizing impacts on potential TCRs is applicable to the project site because the land at the site was used for agriculture and mid-twentieth century farm homes that caused minimal subsurface disturbance during construction. Even with the minimal disturbance, the potential for subsurface prehistoric deposits is considered to be low.

However, given local Native American tribal concerns for potential traditional cultural resources present at the project site, mitigation would be implemented to further reduce potential impacts to a less than significant level. See Mitigation Measures TCR MM-1 through TCR MM-3 below as they pertain to the Gabrielino - Kizh Nation only. The applicable mitigation measures TCR MM-4 through TCR MM-7 concern protection of TCRs and potential human remains as they relate to culturally affiliated Tonga (but non-Gabrielino – Kizh Nation) bands are also provided below.

Mitigation Measure
MM TCR-1: Retain a Native American Monitor Prior to Commencement of GroundDisturbing Activities A. The project applicant/lead agency shall retain a Native American Monitor from or approved by the Gabrieleño Band of Mission Indians – Kizh Nation. The monitor shall be retained prior to the commencement of any “ground-disturbing activity” for the subject project at all project locations (i.e., both on-site and any off-site locations that are included in the project description/definition and/or required in connection with the project, such as public improvement work). “Ground-disturbing activity” shall include, but is not limited to, demolition, pavement removal, potholing, auguring, grubbing, tree removal, boring, grading, excavation, drilling, and trenching into native soil and undocumented soils. The monitor(s) will continue their duties until it is determined through consultation with the permittee, City Planning, that monitoring is no longer warranted.

B. A copy of the executed monitoring agreement shall be submitted to the lead agency prior to the earlier of the commencement of any ground-disturbing activity, or the issuance of any permit necessary to commence a ground-disturbing activity.

C. The monitor will complete daily monitoring logs that will provide descriptions of the relevant ground-disturbing activities, the type of construction activities performed, locations of ground-disturbing activities, soil types, cultural-related materials, and any other facts, conditions, materials, or discoveries of significance to the Tribe. Monitor logs will identify and describe any discovered TCRs, including but not limited to, Native American cultural and historical artifacts, remains, places of significance, etc., (collectively, tribal cultural resources, or “TCR”), as well as any

 SECTION 4.18 – TRIBAL CULTURAL RESOURCES 
7091/ Allen-Cataract Warehouse Project Page 4.18-5
Initial Study/Mitigated Negative Declaration January 2023 discovered Native American (ancestral) human remains and burial goods. Copies of monitor logs will be provided to the project applicant/lead agency upon written request to the Tribe.

D. On-site tribal monitoring shall conclude upon the latter of the following (1) written confirmation to the Kizh from a designated point of contact for the project applicant/lead agency that all ground-disturbing activities and phases that may involve ground-disturbing activities on the project site or in connection with the project are complete; or (2) a determination and written notification by the Kizh to the project applicant/lead agency that no future, planned construction activity and/or development/construction phase at the project site possesses the potential to impact Kizh TCRs.

E. Upon discovery of any TCRs, all construction activities in the immediate vicinity of the discovery shall cease (i.e., not less than the surrounding 50 feet) and the City notified. Construction activities may continue in other areas outside of the designated protection zone, which shall be delineated with cones, flagging, or fencing. The designated Kizh monitor and/or Kizh archaeologist shall evaluate the significance of the find and determine whether the resource uncovered is a TCR. If its determined that the potential resource is a TCR (as defined by PRC, Section 21074), tribes consulting under AB 52 would be provided a reasonable period of time, typically 5 days from the date of a new discovery is made, to conduct a site visit and make recommendations regarding future ground disturbance activities as well as the treatment of any discovered TCRs. The designated tribe monitor/archaeologist shall implement a plan for the treatment and disposition of any discovered TCRs based on the nature of the resource and considering the recommendations of the tribe(s).

Implementation of proposed recommendations will be made based on the determination of the City that the approach is reasonable and feasible. The Kizh will recover and retain all discovered TCRs in the form and/or manner the Tribe deems appropriate, in the Tribe’s sole discretion, and for any purpose the Tribe deems appropriate, including for educational, cultural and/or historic purposes.

MM TCR-2: Unanticipated Discovery of Human Remains and Associated Funerary Objects A. Native American human remains are defined in PRC 5097.98 (d)(1) as an inhumation or cremation, and in any state of decomposition or skeletal completeness.

Funerary objects, called associated grave goods in Public Resources Code Section 5097.98, are also to be treated according to this statute.

B. If Native American human remains and/or grave goods discovered or recognized on the project site, then all construction activities shall immediately cease. Health and Safety Code Section 7050.5 dictates that any discoveries of human skeletal material shall be immediately reported to the County Coroner and all ground-disturbing activities shall immediately halt and shall remain halted until the coroner has determined the nature of the remains. If the coroner recognizes the human remains to be those of a Native American or has reason to believe they are Native American, he or she shall contact, by telephone within 24 hours, the Native American Heritage Commission, and Public Resources Code Section 5097.98 shall be followed.

C. Human remains and grave/burial goods shall be treated alike per California Public Resources Code section 5097.98(d)(1) and (2).

 SECTION 4.18 – TRIBAL CULTURAL RESOURCES 
7091/ Allen-Cataract Warehouse Project Page 4.18-6
Initial Study/Mitigated Negative Declaration January 2023 D. Construction activities may resume in other parts of the project site at a minimum of 200 feet away from discovered human remains and/or burial goods, if the Kizh determines in its sole discretion that resuming construction activities at that distance is acceptable and provides the project manager express consent of that determination (along with any other mitigation measures the Kizh monitor and/or archaeologist deems necessary). (CEQA Guidelines Section 15064.5(f).) E. Preservation in place (i.e., avoidance) is the preferred manner of treatment for discovered human remains and/or burial goods. Any historic archaeological material that is not Native American in origin (non-TCR) shall be curated at a public, non-profit institution with a research interest in the materials, such as the Natural History Museum of Los Angeles County or the Fowler Museum, if such an institution agrees to accept the material. If no institution accepts the archaeological material, it shall be offered to a local school or historical society in the area for educational purposes.

F. Any discovery of human remains/burial goods shall be kept confidential to prevent further disturbance.

MM TCR -3: Procedures for Burials and Funerary Remains:

A. As the Most Likely Descendant (“MLD”), the Koo-nas-gna Burial Policy shall be implemented. To the Tribe, the term “human remains” encompasses more than human bones. In ancient as well as historic times, Tribal Traditions included, but were not limited to, the preparation of the soil for burial, the burial of funerary objects with the deceased, and the ceremonial burning of human remains.

B. If the discovery of human remains includes four or more burials, the discovery location shall be treated as a cemetery and a separate treatment plan shall be created.

C. The prepared soil and cremation soils are to be treated in the same manner as bone fragments that remain intact. Associated funerary objects are objects that, as part of the death rite or ceremony of a culture, are reasonably believed to have been placed with individual human remains either at the time of death or later; other items made exclusively for burial purposes or to contain human remains can also be considered as associated funerary objects. Cremations will either be removed in bulk or by means as necessary to ensure complete recovery of all sacred materials.

D. In the case where discovered human remains cannot be fully documented and recovered on the same day, the remains will be covered with muslin cloth and a steel plate that can be moved by heavy equipment placed over the excavation opening to protect the remains. If this type of steel plate is not available, a 24-hour guard should be posted outside of working hours. The Tribe will make every effort to recommend diverting the project and keeping the remains in situ and protected. If the project cannot be diverted, it may be determined that burials will be removed.

E. In the event preservation in place is not possible despite good faith efforts by the project applicant/developer and/or landowner, before ground-disturbing activities may resume on the project site, the landowner shall arrange a designated site location within the footprint of the project for the respectful reburial of the human remains and/or ceremonial objects. Construction activities may continue in other areas outside of the designated protection zone, which shall be delineated with cones, flagging, or fencing.

 SECTION 4.18 – TRIBAL CULTURAL RESOURCES 
7091/ Allen-Cataract Warehouse Project Page 4.18-7
Initial Study/Mitigated Negative Declaration January 2023 F. Each occurrence of human remains and associated funerary objects will be stored using opaque cloth bags. All human remains, funerary objects, sacred objects and objects of cultural patrimony will be removed to a secure container on site if possible.

These items should be retained and reburied within six months of recovery. The site of reburial/repatriation shall be on the project site but at a location agreed upon between the Tribe and the landowner at a site to be protected in perpetuity. There shall be no publicity regarding any cultural materials recovered.

G. The Tribe will work closely with the project’s qualified archaeologist to ensure that the excavation is treated carefully, ethically and respectfully. If data recovery is approved by the Tribe, documentation shall be prepared and shall include (at a minimum) detailed descriptive notes and sketches. All data recovery data recoveryrelated forms of documentation shall be approved in advance by the Tribe. If any data recovery is performed, once complete, a final report shall be submitted to the applicant, the City, the South Central Coastal Information Center, the Tribe and the NAHC. The Tribe does NOT authorize any scientific study or the utilization of any invasive and/or destructive diagnostics on human remains.

MM TCR-4: Prior to the commencement of any ground disturbing activity at the project site, the project applicant shall retain a Native American Monitor from a local culturallyaffiliated Gabrielino (Tongva) tribe. A copy of the executed contract shall be submitted to the City of San Dimas Planning Division prior to the issuance of any permit necessary to commence a ground-disturbing activity.

MM TCR-5: The Tribal monitor shall only be present on-site during the construction phases that involve ground-disturbing activities. Ground disturbing activities are defined by the Tribe as activities that may include, but are not limited to, pavement removal, potholing or auguring, grubbing, tree removals, boring, grading, excavation, drilling, and trenching, within the project area. The Tribal Monitor will complete daily monitoring logs that will provide descriptions of the day’s activities, including construction activities, locations, soil, and any cultural materials identified. The onsite monitoring shall end when all ground-disturbing activities on the Project Site are completed, or when the Tribal Representatives and Tribal Monitor have indicated that all upcoming ground-disturbing activities at the Project Site have little to no potential for impacting Tribal Cultural Resources.

MM TCR-6: Upon discovery of a Tribal Cultural Resource, construction activities shall cease in the immediate vicinity of the find (not less than the surrounding 60 feet) until the find can be assessed. All Tribal Cultural Resources unearthed by project activities shall be evaluated by the qualified archaeologist and Tribal monitor as described in TCR MM4. If the resources are Native American in origin, the monitoring Tribe may retain it/them in the form and/or manner the Tribe deems appropriate, for educational, cultural and/or historic purposes.

MM TCR-7: If human remains are encountered during excavations associated with this project, all work shall stop within a 60-foot radius of the discovery and the Los Angeles County Coroner will be notified (§ 5097.98 of the Public Resources Code). The Coroner will 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 will contact the

 SECTION 4.18 – TRIBAL CULTURAL RESOURCES 
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Initial Study/Mitigated Negative Declaration January 2023 NAHC. The NAHC will be responsible for designating the Most Likely Descendant (MLD). The MLDS (either an individual or sometimes a committee) will be responsible for the ultimate disposition of the remains, as required by § 7050.5 of the California Health and Safety Code. The MLD will 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).

Level of Significance After Mitigation
Mitigation measures TCR-1 through TCR-3 pertain to the Gabrielino – Kizh Nation if they are chosen to conduct tribal monitoring and if they are chosen to be the MLD by the NAHC, if human remains are discovered. Mitigation measures TCR-4 through TCR -7 pertain if a different Gabrielino (Tongva) tribe is chosen to conduct the tribal monitoring and if they are chosen to be the MLD by the NAHC, should human remains be discovered. These MMs require monitoring of ground-disturbing activities during project construction by a Native American monitor; halting construction activities if unanticipated discovery of a TCR or historic artifact(s) and their evaluation by the Native American and a qualified archaeologist, describe treatment of human remains if found, and the disposition of TCRs and historic artifacts if found. With implementation of MMs TCR-1 through TCR-7, potential project impacts on TCRs would be less than significant.

 SECTION 4.19 – UTILITIES AND SERVICE SYSTEMS 
7091/ Allen-Cataract Warehouse Project Page 4.19-1
Initial Study/Mitigated Negative Declaration January 2023

4.19 Utilities and Service Systems
Would the project:

Potentially
Significant
Impact
Less than
Significant
Impact with
Mitigation
Incorporated
Less than
Significant
Impact
No
Impact
a) Require or result in the relocation or
construction of new or expanded water,
wastewater treatment or stormwater
drainage, electric power, natural gas, or
telecommunications facilities, the
construction or relocation of which could
cause significant environmental effects?
X
b) Have sufficient water supplies available to
serve the project and reasonably foreseeable
future development during normal, dry, and
multiple dry years?
X
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
d) Generate solid waste in excess of State or
local standards, in excess of the capacity of
local infrastructure, or otherwise impair the
attainment of solid waste reduction goals?
X
e) Comply with federal, state, and local
management and reduction statutes and
regulations related to solid waste?
X
a) Would the project require or result in the relocation or construction of new or expanded water, wastewater treatment or stormwater drainage, electric power, natural gas, or telecommunications facilities, the construction or relocation of which could cause significant environmental effects?
Less than Significant Impact
Water Treatment: As detailed below, there would be sufficient water supplies to serve the project site. Therefore, the proposed project would not require new or expanded water facilities. The project would have a less than significant impact in this regard.

Wastewater Treatment: Wastewater from San Dimas is conveyed by sewers owned by the City of San Dimas and the Los Angeles County Sanitation Districts (LACSD) to LACSD’s San Jose Creek Water Reclamation Plant (SJCWRP) in the Community of Avocado Heights in unincorporated Los Angeles County (Stetson, 2021), approximately 13 miles southwest of the project site. The SJCWRP has a capacity of 100 million gallons per day (mgd). Average effluent flows in 2020 were 48.2 mgd (LACSD, 2021) and the residual capacity is 51.8 mgd. Project operation is estimated to generate 9,562 gallons of wastewater per day, as shown below in Table 4.19-1.

 SECTION 4.19 – UTILITIES AND SERVICE SYSTEMS 
7091/ Allen-Cataract Warehouse Project Page 4.19-2
Initial Study/Mitigated Negative Declaration January 2023 Table 4.19-1

ESTIMATED PROJECT WASTEWATER GENERATION
Land Use Square Feet Wastewater Generation (gallons)
Per square 1,000 sq. ft.1 Total
Light Manufacturing 63,749 0.15 9,562.35
1 Source: LACSD, 2021b
The project proposes to install new sanitary sewers to serve the entire development to the specifications of the City Engineer and Los Angeles County Sewer Maintenance. All existing on-site sewer/septic systems shall be abandoned by a method approved by the City Engineer. The new system shall connect the sewer lines from the project site to the existing sewer network on Cataract Avenue. All sewer line sizes and connections are subject to review by the City. The project applicant will work with the City’s Public Works Department for necessary approvals and ensure compliance with applicable requirements. No new treatment facilities or expanded entitlements will be required.

Therefore, the project would have a less than significant impact on wastewater treatment.

Stormwater Drainage:

The California State Water Resources Control Board (SWRCB), Los Angeles Regional Control Board, Region #4 (aka. Los Angeles Region Water Quality Control Board (LARWQCB)) is one of nine Regional Boards statewide. These Boards are part of the California Environmental Protection Agency (CAL/EPA). The LARWQCB has adopted the National Pollutant Discharge Elimination System (NPDES) Municipal Separate Storm Sewer System Permit (MS4 Permit) (Order No. R4-2012-0175).

The NPDES/MS4 Permit required that the Los Angeles County Flood Control District, the County of Los Angeles, and 84 other municipalities (including San Dimas) within the County of Los Angeles comply with the prescribed elements of the MS4 Permit. San Dimas and a few other member agencies agreed to collaborate on the compliance of certain elements of the MS4 Permit and agreed to a costsharing formula based on the land area within the San Gabriel Watershed. The faction is known as the East San Gabriel Valley Watershed Management Group (ESGVWMG). The ESGVWMG consists of the City of La Verne, as the coordinating agency for the Watershed Management Plan and Coordinated Integrated Monitoring Program, and the cities of Claremont, Pomona, and San Dimas. The Program regulates, through Order No. R4-2012-0175, the discharge of pollutants into the Waters of the U.S. through stormwater and urban runoff conveyance systems, including flood control facilities.

The project would be required by the California 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 Section 402 of the Clean Water Act (CWA). The project would be required to obtain an NPDES permit, prepare a Stormwater Pollution Prevention Plan (SWPPP), and implement Best Management Practices (BMPs) prior to the commencement of construction activities; additionally, BMPs must be maintained, inspected after each precipitation event, and repaired or replaced as necessary.

Project compliance with regulatory requirements would reduce potential erosion/siltation impacts during the construction phase of the project to a less than significant level. The proposed project would be designed in compliance with applicable City of San Dimas regulations regarding stormwater runoff and the project would be reviewed by the City of San Dimas Public Works Department to ensure that the development would not create or contribute to runoff water that

 SECTION 4.19 – UTILITIES AND SERVICE SYSTEMS 
7091/ Allen-Cataract Warehouse Project Page 4.19-3
Initial Study/Mitigated Negative Declaration January 2023 would exceed the capacity of existing or planned stormwater drainage systems. Refer to Section 4.10, Hydrology and Water Quality, for additional information.

Electric Power: Electric power for the City of San Dimas is provided by Southern California Edison (SCE). The proposed project is located in a developed area, and the 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). The project would be constructed in accordance with applicable Title 24 regulations, and would not necessitate the construction or relocation of electric power facilities. Therefore, a less than significant impact would occur.

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 2018 California Gas Report, SoCalGas analyzed an 18-year demand period, from 2018 to 2035, to determine its ability to meet projected demand (California Gas and Electric Utilities, 2018. p. 63).

SoCalGas expects total gas demand to decline 0.74 percent annually from 2018 to 2035 as a result of energy-efficiency standards and programs, renewable electricity goals, modest economic growth in its service region, and advanced metering infrastructure (California Gas and Electric Utilities, 2018, p. 66). Transportation-related industrial uses account for 2.7% of total industrial gas demand, and the proposed project is not of the size or scope to increase this demand (California Gas and Electric Utilities, 2018, p. 73). Moreover, SoCalGas plans on implementing aggressive energy-efficiency programs that will result in natural gas savings across all sectors that will ensure the longevity of its natural gas supplies and adequate generation rates (California Gas and Electric Utilities, 2018, p. 78).

Therefore, the 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, no natural gas facilities would have to be constructed or relocated, and a less than significant impact would occur.

Telecommunications Facilities: Telecommunication services, including internet, phone, and television, for the City of San Dimas, are provided by Spectrum and Frontier Communications. The proposed project would not interfere with the operation of these services, and a less than significant impact would occur.
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?
Less than Significant Impact
As detailed further in Section 4.10, the project site lies within the service area of the Golden State Water Company (GSWC). GSWC’s 2020 UWMP (or 2020 Plan) was prepared consistent with the CWC and the recommended organization provided in DWR’s Final “Urban Water Management Plan Guidebook 2020” (Final 2020 UWMP Guidebook), dated March 2021. GSWC’s 2020 Plan was prepared in coordination with planning agencies including the Los Angeles County Department of Regional Planning and the Southern California Association of Governments (SCAG).

GSWC is a sub-agency of Three Valleys Municipal Water District (TVMWD), a wholesale water agency.

TVMWD prepared a 2020 Plan which is incorporated in GSWC’s 2020 Plan by reference. In addition,

 SECTION 4.19 – UTILITIES AND SERVICE SYSTEMS 
7091/ Allen-Cataract Warehouse Project Page 4.19-4
Initial Study/Mitigated Negative Declaration January 2023 GSWC provided its 2020 Plan to TVMWD which includes water use projections in five-year increments for a normal year, a single dry year, and five consecutive years of drought conditions over the next 25 years (Stetson, 2021, p. 6-3).

GSWC water is a blend of groundwater pumped from the Main San Gabriel Basin and purchased water from the Metropolitan Water District of Southern California and Three Valleys Municipal Water District; treated groundwater and surface water purchased from Covina Irrigating Company; treated water purchased from Walnut Valley Water District; and local surface water from San Dimas Canyon Creek. GSWC’s main source of water supply is groundwater pumped from the Main Basin (Stetson, 2021, p. 6-1).

Information regarding the reliability of GSWC’s water supplies is based on the historical precipitation data in the San Gabriel Valley. Historical annual precipitation in the San Gabriel Valley is based on data collected from Station 047050 (Pomona Fairplex, California). Furthermore, potential future climate change impacts may increase the average annual precipitation within GSWC’s service area, thus indicating the use of historical data is a reasonable and conservative approach. The historical average rainfall in the vicinity of GSWC’s service area is 17.2 inches.

During normal and wet years, the GSWC’s 2020 UWMP uses the Main Basin water for groundwater recharge. The total freshwater storage capacity of the Main Basin is estimated to be about 9.5 million acre-feet. Of that, about 1.1 million acre-feet have been used historically in Main Basin operations.

One foot of elevation change is roughly the equivalent of about 8,000 acre-feet of water storage. The historical high groundwater elevation was recorded at over 329.1 feet in April 1916, at which time Main Basin storage was estimated to be about 8.7 million acre-feet. The historical low was recorded in November 2018 at 169.4 feet, at which time Main Basin storage was estimated to be about 7.4 million acre-feet (Stetson, 2021, p. 6-20).

GSWC has emergency interties (or interconnections) with other water agencies that serve as shortterm emergency water supplies. Emergency interconnections are distribution system interconnections between water agencies for use during critical situations where one system or the other is temporarily unable to provide sufficient potable water to meet its water demands and/or fire protection needs. An emergency interconnection will allow a water system to continue serving water during critical situations such as local water supply shortages as a result of earthquakes, fires, prolonged power outages, and droughts (Stetson, 2021, p. 6-49).

Additionally, the GSWC would implement the California Public Utilities Commission (CPUC) Water Conservation and Rationing Plan (CPUC, 2022), which is separated into four stages of water rationing. In each of the water rationing levels, different restrictions would limit the use of water use as detailed in Table 4.19-1. To determine the reliability of its water supplies, GSVW analyzed anticipated water supply and demand for normal, dry, and multiple dry years. These analyses totaled the amount of water expected from each of its supplies during various types of years, and compared them with anticipated demand, accounting for water conservation policies to be implemented in dry years. As shown in Tables 4.19-2, 4.19-3, and 4.19-4 below, water supplies are adequate to meet projected demand in normal, dry, and multiple dry years.

 SECTION 4.19 – UTILITIES AND SERVICE SYSTEMS 
7091/ Allen-Cataract Warehouse Project Page 4.19-5
Initial Study/Mitigated Negative Declaration January 2023 Table 4.19-1

WATER SHORTAGE CONTINGENCY PLANNING LEVELS
Shortage
Level
Percent
Shortage
Range
Shortage Response action (Narrative description)
1 Up to 10%
Watering or irrigating is limited to a maximum of 2 days per week. All outdoor irrigation must occur between 9 a.m. or after 5 p.m. GSWC will change the number of watering days and the specific days of watering after notification in accordance with CPUC Rule 14.1.
2 Up to 20%
In addition, to Shortage Level 1, allocations will be based on the 2013 baseline of less than 32 percent. No allocation will be less than 8 Ccf/month or 16 Ccf/bi-monthly billing periods. Users in excess of allocation will be charged a regular rate plus $2.50 per Ccf.
3 Up to 30%
In addition, to Shortage Level 2, GSWC may add actions if conditions warrant including, but not limited to, increasing the number of watering days and the specific days of watering in accordance with CPUC Rule 14.1. 4 Up to 40% In addition, to Shortage Level 3, users in excess of allocation will be charged a regular rate plus $5.00 per Ccf.
5 Up to 50%
In addition, to Shortage Level 4, GSWC may add actions if conditions warrant including, but not limited to, increasing the number of watering days and the specific days of watering in accordance with CPUC Rule 14.1. 6 Up to 60% In addition, to Shortage Level 5, users in excess of allocation will be charged a regular rate plus $10.00 per Ccf.

Source: Golden State Water Company- San Dimas System 2020 Urban Water Management Plan, Table 8-1 Table 4.19-2

NORMAL YEAR SUPPLY AND DEMAND COMPARISON
Totals 2025 2030 2035 2040 2045
Supply Totals 10,753 10,796 10,840 10,883 10,927
Demand Totals 10,753 10,796 10,840 10,883 10,927
Difference 0 0 0 0 0
*Volumes are in acre-feet (AF).

Source: Golden State Water Company- San Dimas System 2020 Urban Water Management Plan, Table 7-2 Table 4.19-3

SINGLE DRY YEAR SUPPLY AND DEMAND COMPARISON
Totals 2025 2030 2035 2040 2045
Supply Totals 10,402 10,444 10,485 10,527 10, 569
Demand Totals 10,402 10,444 10,485 10,527 10, 569
Difference 0 0 0 0 0
*Volumes are in acre-feet (AF).

Source: Golden State Water Company- San Dimas System 2020 Urban Water Management Plan, Table 7-3

 SECTION 4.19 – UTILITIES AND SERVICE SYSTEMS 
7091/ Allen-Cataract Warehouse Project Page 4.19-6
Initial Study/Mitigated Negative Declaration January 2023 Table 4.19-4

MULTIPLE DRY YEARS SUPPLY AND DEMAND COMPARISON
Year Totals 2025 2030 2035 2040 2045
First Year
Supply Totals 33,030 38,530 42,030 45,030 45,030
Demand Totals 22,879 24,481 26,183 28,041 30,043
Difference 10,151 14,049 15,847 16,989 14,987
Second Year
Supply Totals 33,030 38,530 42,030 45,030 45,030
Demand Totals 20,799 22,256 23,802 25,492 27,312
Difference 12,231 16,274 18,228 19,538 17,718
Third Year
Supply Totals 33,030 38,530 42,030 45,030 45,030
Demand Totals 18,719 20,030 21,422 22,943 24,580
Difference 14,311 18,500 20,608 22,087 20,450
Fourth Year
Supply Totals 11,983 12,031 12,079 12,127 12,175
Demand Totals 11,983 12,031 12,079 12,127 12,175
Difference 0 0 0 0 0
Fifth Year
Supply Totals 9,359 9,397 9,434 9,472 9,510
Demand Totals 9,359 9,397 9,434 9,472 9,510
Difference 0 0 0 0 0
*Volumes are in acre-feet (AF).

Source: Golden State Water Company- San Dimas System 2020 Urban Water Management Plan, Table 7-4 Moreover, although the project would use water during project operation, increased water usage from projects such as the proposed project has been accounted for in the latest UWMP prepared for GSWC. The UWMP found that with its current water supplies, planned future water supplies, and water conservation, GSWC will be able to reliably provide water to its customers. Although a minor increase in the water demand could occur as a result of the project, the increase would not be significant because adequate water supplies and facilities are available to serve the proposed project, and reasonably foreseeable future development during normal, dry, and multiple dry years.

Therefore, less than significant impacts are anticipated. 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? Less than Significant Impact
As described above, the volume of wastewater generated by the project represents only a small fraction of the existing daily capacity of the wastewater treatment facility providing service in the area. Therefore, the wastewater anticipated to be generated by the project would be within the existing capacity of the wastewater treatment provider and less than significant impacts would occur. d) Would the project generate solid waste in excess of State or local standards, in excess of the capacity of local infrastructure, or otherwise impair the attainment of solid waste reduction goals?
Less than Significant Impact
Solid waste disposal services for San Dimas are provided by Waste Management. The City contracts with Waste Management for curbside and business trash collection and recycling services, including

 SECTION 4.19 – UTILITIES AND SERVICE SYSTEMS 
7091/ Allen-Cataract Warehouse Project Page 4.19-7
Initial Study/Mitigated Negative Declaration January 2023 green waste recycling. Currently, green waste is taken to the Puente Hills Landfill located in Whitter, recyclables are taken to the Allen Company in Baldwin Park, and bulk waste is transferred to El Sobrante Landfill in Corona (WM, 2022).

The current permitted solid waste disposal at the El Sobrante Landfill is 16,054 tons per day (Riverside County, 2022). The Annual Status Report reported 128.6 million tons remaining at the end of 2020. At the current rate, this equates to approximately 35 years of site life remaining (El Sobrante Landfill, 2020).

Project construction and operation would generate solid waste requiring disposal at local landfills.

Materials generated during the construction of the project would include paper, cardboard, metal, plastics, glass, concrete, lumber scraps, and other materials. During construction (short-term) and operation (long-term), bulk solid waste, excess building material, fill, and other construction-related solid waste would be disposed of in a manner consistent with the State of California Integrated Waste Management Act of 1989 (CIWMA) and would be removed from the project site. Existing regulations related to recycling during the construction and operation phases of the project require that the project would provide readily accessible areas that serve the entire building and are identified for the depositing, storage, and collection of nonhazardous materials for recycling, including (at a minimum) paper, corrugated cardboard, glass, plastics, and metals.

The project is anticipated to have 65 employees which, using the solid waste generation rate in Table 4.19-5, would result in an estimated generation of 78 tons of waste per year. As discussed above, the current permitted solid waste disposal at the El Sobrante Landfill is 16,054 tons per day.

Therefore, the project’s construction waste would represent a small fraction of the City’s landfill capacity.

Table 4.19-5

ESTIMATED PROJECT-GENERATED SOLID WASTE
Land Use Generation Rate1 Waste
(tons/year)
Transportation-related
light-industrial 1.20 (tons/employee/year) 78
1 Cal Recycle, 2015. 2014 Generator-Based Characterization of Commercial Sector Disposal and Diversion in California.

Accessed online at: https://www2.calrecycle.ca.gov/WasteCharacterization/PubExtracts/2014/GenSummary.pdf on March 24, 2020.

The project’s estimated increase of 0.214 tons of waste per day represents a small fraction of the El Sobrante Landfill's daily capacity (0.0013%). Since sufficient permitted landfill capacity exists to support the operation of the proposed project, no adverse impact on either the solid waste collection service or the landfill disposal system would occur. Therefore, project impacts on existing solid waste disposal facilities would be less than significant.
e) Would the project comply with federal, state, and local management and reduction statutes and regulations related to solid waste?

 SECTION 4.19 – UTILITIES AND SERVICE SYSTEMS 
7091/ Allen-Cataract Warehouse Project Page 4.19-8
Initial Study/Mitigated Negative Declaration January 2023 Less than Significant Impact
In 1989, the California Legislature enacted the California Integrated Waste Management Act (AB 939), 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.

The Los Angeles Countywide Integrated Waste Management Plan (LACIWMP) outlines the goals, policies, and programs the County and its cities would implement to create an integrated and costeffective waste management system that complies with the provisions of AB 939 and its diversion mandates. The LACIWMP outlines programs to reduce, recycle and properly divert solid waste from sanitary landfills.

The solid waste generated by the project would be collected by Waste Management, the designated waste hauler, and transported offsite to transfer facilities and landfills for reuse, recycling, and/or disposal, as appropriate (WM, 2022). Waste Management delivers solid waste to the El Sobrante Landfill, which operates under a permit from the Riverside County Department of Public Health, Solid Waste Management Division and requires regular reporting and monitors compliance.

The proposed project would comply with the LACIWMP and the City’s waste reduction procedures and comply with applicable elements of AB 1327, Chapter 18 (California Solid Waste Reuse and Recycling Access Act of 1991) and other applicable local, state, and federal solid waste disposal standards, thereby ensuring that the solid waste stream to regional landfills is reduced in accordance with existing regulations. Impacts are considered less than significant.

 SECTION 4.20 – WILDFIRE 
7091/ Allen-Cataract Warehouse Project Page 4.20-1
Initial Study/Mitigated Negative Declaration January 2023

4.20 Wildfire
If located in or near state responsibility
areas or lands classified as very high fire
hazard severity zones, would the
project:

Potentially
Significant
Impact
Less than
Significant
Impact with
Mitigation
Incorporated
Less than
Significant
Impact
No
Impact
a) Substantially impair an adopted
emergency response plan or emergency
evacuation plan?
X
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?
X
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
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?
X
A wildfire is an uncontrolled fire that spreads through vegetative fuels, posing danger and threatening life and property. Wildfires can occur in undeveloped areas and spread to urban areas, where development can be heavily concentrated. The City has foothills to the north that have steep terrain and light, flashy fuels, and the predominant weather patterns feature high temperatures and low humidity, as well as seasonal high-speed Santa Ana winds. These factors, together with many homes that are built near or in the interface zone, have created a potential for significant damage due to wildfire. Historically, most of the wildfires in the City have occurred in northwest San Dimas, with occasional fires in the San Gabriel Mountains. The City has established a Fire Hazard Overlay District in open space areas in northern San Dimas to reduce the risk of wildfire.

The project is located generally in the northern part of the City of San Dimas. The project site is not located in a Fire Hazard Severity Zone for either a Local Responsibility Area or State Responsibility Area (refer to Figures 4.20-1 and 4.20-2), (CAL FIRE, 2020). The City of San Dimas does contain areas classified as very high fire hazard severity zones (VHFHSZs) in local responsibility areas (LRAs) (CAL FIRE, 2008). There is a VHFHSZ in a local responsibility area that is approximately 0.5 miles to the north.

 SECTION 4.20 – WILDFIRE 
7091/ Allen-Cataract Warehouse Project Page 4.20-2
Initial Study/Mitigated Negative Declaration January 2023 Figure 4.20-1
FIRE HAZARD SEVERITY ZONE – LOCAL RESPONSIBILITY AREA

 SECTION 4.20 – WILDFIRE 
7091/ Allen-Cataract Warehouse Project Page 4.20-3
Initial Study/Mitigated Negative Declaration January 2023 Figure 4.20-2
FIRE HAZARD SEVERITY ZONE – STATE RESPONSIBILITY AREA

 SECTION 4.20 – WILDFIRE 
7091/ Allen-Cataract Warehouse Project Page 4.20-4
Initial Study/Mitigated Negative Declaration January 2023 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 detailed above, the project site is not located in areas or lands classified as VHFHSZs. However, as shown in Figure 4.20-1, the project site is located 0.5 miles south of a VHFHSZ LRA. The City’s Local Hazard Mitigation Plan (LHMP) anticipates that all interstate freeways would serve as evacuation routes, and Interstate 210 is adjacent to the site, accessible from an on-ramp 0.25 mile east of the site at San Dimas Avenue. The City has accommodated continued growth and development in VHFHSZs and the proposed project would not affect the efficacy of established fire-safety plans. Since the project is not located in an SRA or LRA and development near LRAs and VHFHSZs has been accounted for in the City’s safety plans, the project would not impair the implementation of or physically interfere with an adopted emergency response plan or emergency evacuation plan. A less than significant impact would occur.
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 detailed above, the project site is not located in areas or lands classified as VHFHSZs. However, the project site is near a VHFHSZ LRA to the north. No slopes are located on the project site which could exacerbate wildfire risks. Historically, northern San Dimas has faced the majority of wildfires in the city due to slopes and Santa Ana winds blowing down from San Gabriel Mountains through San Dimas Canyon. The most damaging was the Williams Fire in September 2002, which destroyed 62 structures and burned 38,984 acres. Fires have historically been contained to this area (LAAlmanac, 2022). Therefore, the project would not expose project occupants (i.e., those working at the project site during project operations) to pollutant concentrations from a wildfire or the uncontrolled spread of a wildfire. A less than significant impact would occur. 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 detailed above, the project site is not located in areas or lands classified as VHFHSZs but is near VHFHSZs located to the north. However, the project would not require the installation or maintenance of associated infrastructure that may exacerbate fire risk. As demonstrated in this document, neither construction nor operation of the project would result in significant temporary or ongoing impacts on the environment. It would be constructed in compliance with applicable building and fire codes. Therefore, the proposed project would have a less than significant impact in this regard.

 SECTION 4.20 – WILDFIRE 
7091/ Allen-Cataract Warehouse Project Page 4.20-5
Initial Study/Mitigated Negative Declaration January 2023 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 detailed above, the project site is not located in or near areas or lands classified as VHFHSZs but is near a VHFHSZ to the north. However, the proposed project would not 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. The City of San Dimas has historically experienced landslides; most recently in February 2010 along the transition road to the northbound Orange (SR57) Freeway from the San Bernardino (I-10) Freeway (CALPoly Pomona, 2022). However, there are no steep slopes or hills on the project site; the nearest hills are the San Gabriel Mountains, the foothills of which begin approximately 0.5 miles north of the project site. Project development would not exacerbate landslide hazards. Therefore, the proposed project would have a less than significant impact in this regard.

 SECTION 4.21 – MANDATORY FINDINGS OF SIGNIFICANCE 
7091/ Allen-Cataract Warehouse Project Page 4.21-1
Initial Study/Mitigated Negative Declaration January 2023

4.21 Mandatory Findings of Significance
Does the project have:

Potentially
Significant
Impact
Less than
Significant
Impact with
Mitigation
Incorporated
Less than
Significant
Impact
No
Impact
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
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?
X
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)?
X
c) Environmental effects which will
cause substantial adverse effects on
human beings, either directly or
indirectly?
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 an urbanized setting and is approximately 350 feet south of Interstate 210 (I-210). The site is surrounded by commercial properties on the west, north, and east; south of the site is a largely residential neighborhood. Although the site is less than two miles south of the Angeles National Forest, the project area and BSA provide low habitat value for special-status plant and wildlife species (including species listed by state or federal agencies as “candidate” or “sensitive” species). The reconnaissance-level biological survey conducted on January 7, 2022, determined that approximately 2.19 acres of the project site are urban developed/ornamental or non-native

 SECTION 4.21 – MANDATORY FINDINGS OF SIGNIFICANCE 
7091/ Allen-Cataract Warehouse Project Page 4.21-2
Initial Study/Mitigated Negative Declaration January 2023 grassland, both with relatively low diversity of species. The project site is surrounded by developed lands and heavily modified, non-natural landscapes. With the implementation of mitigation measures BIO-1 and BIO-2, the project would have a less than significant impact on nesting bird species as well as special-status plant and wildlife species.

Section 4.5 of this document addresses potential impacts on Cultural Resources. The project would be built on vacant land that has been previously graded Based on the cultural resource records search, it was determined that no historic cultural resources or prehistoric archeological sites have been previously recorded within the project site boundary. Within the 0.5-mile buffer zone, there is one recorded historic era cultural resource but no prehistoric archaeological sites. The result of the pedestrian survey was negative for both prehistoric sites and isolates on the project site. Based on the results of the records search and the onsite field survey, it is unlikely that cultural resources or tribal 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 CUL1 and CUL-2 would ensure that impacts on archeological resources would be less than significant. 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
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 to avoid or mitigate environmental effects.

Sections 4.3 and 4.13 of this Initial Study address potential impacts related to Air Quality 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 4.13, 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 (both during the construction and operational phases); employees from the local workforce would be hired during both the construction and operational phases of the project. The project is not of the scope or scale to induce people to move from outside of the project area to work on 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, impact related to indirect population growth resulting solely from the project is expected to be less than significant.

 SECTION 4.21 – MANDATORY FINDINGS OF SIGNIFICANCE 
7091/ Allen-Cataract Warehouse Project Page 4.21-3
Initial Study/Mitigated Negative Declaration January 2023 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 The Phase I ESA report prepared for the project states that there was no Recognized Environmental Concerns (REC) were identified on the project site. However, the future tenant is unknown at this time and the use of specific hazardous materials is unknown. With the implementation of mitigation measures HAZ-1 and HAZ-2, potential impacts associated with the handling of hazardous materials would be less than significant.

As discussed in Sections 4.1 through 4.20 of this document 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.

 SECTION 5.0 – REFERENCES 
7091/ Allen-Cataract Warehouse Project Page 5-1
Initial Study/Mitigated Negative Declaration January 2023

5.0 REFERENCES
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ARB, 2022. EMFAC (Emission Factor 2021 v1.0.2 webtool). California Air Resources Board.

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Observation Search. Available at https://www.calflora.org/entry/observ.html. Accessed on January 28, 2022
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Cal-IPC (California Invasive Plant Council). 2006. The California Invasive Plant Inventory. Cal-IPC Publication 2006-02. California Invasive Plant Council. Berkeley, California. Available at https://www.cal-ipc.org/plants/inventory/about-the-inventory/. Accessed on December 10, 2021.

CalPoly Pomona, 2022. San Dimas Landslide. Accessed online at https://polycentric.cpp.edu/2010/02/san_dimas_landslide on November 23, 2022.

CDFW (California Department of Fish and Wildlife) 2021a. BIOS Habitat Connectivity Viewer.

Accessed at ftp://ftp.dfg.ca.gov/BDB/GIS/BIOS/Habitat_Connectivity/. Accessed on April 20, 2022.

CDFW. 2022b. California Wildlife Habitat Relationships Life History Accounts and Range Maps.

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 SECTION 5.0 – REFERENCES 
7091/ Allen-Cataract Warehouse Project Page 5-2
Initial Study/Mitigated Negative Declaration January 2023 CDFW. 2022c. California Natural Community List. Available at:
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CEC (California Energy Commission) 2021. The 100 percent clean energy act of 2018 (Senate Bill 100). Accessed online at: https://www.energy.ca.gov/news/2021-03/california-releasesreport-charting-path-100-percent-clean-electricity on November 23, 2022.

City of San Dimas, 1991. San Dimas, California, Municipal Code Title 18, Zoning, Chapter 18.128 Industrial Zones. Available at
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City of San Dimas. 2006. San Dimas Municipal Code. Title 18: Zoning. Chapter 18.162: Tree Preservation. Available at
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City of San Dimas, 2022. Housing Element 2021-2029 Update, adopted September 27, 2022. Accessed online at
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CNDDB (California Natural Diversity Database), 2022a. RareFind 5 (internet) California Department of Fish and Wildlife (5.2.14). Available at
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CNDDB (California Natural Diversity Database), 2022b. Natural Diversity Database. July 2022. Special Animals List. California Department of Fish and Wildlife. Sacramento, CA. Available at. Last accessed on July 28, 2022.

CNPS (California Native Plant Society), 2022a. Rare Plant Program. Inventory of Rare and Endangered Plants of California (online edition, v8-03 0.39). Available at http://www.rareplants.cnps.org. Accessed on January 5, 2022.

CNPS. 2022b. A Manual of California Vegetation, Online Edition. California Native Plant Society, CA. 1300 pp. Retrieved from: http://www.cnps.org/cnps/vegetation/. Accessed on January 4, 2022.

Cornell Lab of Ornithology. 2022. All About Birds. Cornell Lab of Ornithology, Ithaca, New York.

Available at https://www.allaboutbirds.org. Accessed on June 20, 2022 CPCU (California Public Utilities Commission), 2022. Standard Practices. Accessed at https://www.cpuc.ca.gov/industries-and-topics/water/standard-practices, on November 23, 2022.

 SECTION 5.0 – REFERENCES 
7091/ Allen-Cataract Warehouse Project Page 5-3
Initial Study/Mitigated Negative Declaration January 2023 CTG Energetics, Inc. 2010. City of San Dimas Greenhouse Gas Inventory and Technical Supporting Data. Prepared for City of San Dimas, January 1. Available at https://files.sandimasca.gov/Document_Center/Department/Community%20developme nt/Projects%20&%20Programs/Energy%20Programs/San-Dimas-City-wideGreenhouse-Gas-Inventory.pdf. Accessed on November 18, 2022.

Dibblee, T.W., and Minch, J.A. 2002. Geologic map of the San Dimas and Ontario quadrangles, Los Angeles and San Bernardino Counties, California. Accessed online via the US Geological Survey National Geologic Map Database at:
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FEMA (Federal Emergency Management Agency), 2021. FEMA Flood Map Service Center. Accessed online at: https://msc.fema.gov/portal/search?AddressQuery=la%20mirada%2C%20CA, on November 23, 2022.

FRAP (Federal and Resource Assessment Program), 2021. Priority Landscapes, Accessed online at https://www.arcgis.com/apps/MapSeries/index.html?appid=f767d3f842fd47f4b35d855 7f10387a7, accessed on April 6, 2022.

FTA (Federal Transit Administration), 2018. Transit Noise and Vibration Impact Assessment Manual., Office of Planning and Environment, Washington, DC, FTA Report No. 0123.

September. Internet: https://www.transit.dot.gov/sites/fta.dot.gov/files/docs/researchinnovation/118131/transit-noise-and-vibration-impact-assessment-manual-fta-reportno-0123_0.pdf.

Google Earth V. 7.3.3.7786 (1985-2020). City of San Dimas, Los Angeles County, California.

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 SECTION 5.0 – REFERENCES 
7091/ Allen-Cataract Warehouse Project Page 5-4
Initial Study/Mitigated Negative Declaration January 2023 Holland, R.F. 1986. Preliminary Descriptions of the Terrestrial Natural Communities of California.

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Meyer, S.E., Callaham, M.A., Stewart, J.E., Warren, S.D. 2021. Invasive Species Response to Natural and Anthropogenic Disturbance. In: Poland, T.M., Patel-Weynand, T., Finch, D.M., Miniat, C.F., Hayes, D.C., Lopez, V.M. (eds) Invasive Species in Forests and Rangelands of the United States. Springer, Cham. https://doi.org/10.1007/978-3-030-45367-1_5 NatureServe. 2022. Bromus diandrus ruderal grassland. Available at:
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Initial Study/Mitigated Negative Declaration January 2023 OPR (Office of Planning and Research). 2018. Technical Advisory on Evaluating Transportation Impacts in CEQA. Accessed online at https://opr.ca.gov/docs/20190122- 743_Technical_Advisory.pdf, on July 7, 2022.

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 SECTION 5.0 – REFERENCES 
7091/ Allen-Cataract Warehouse Project Page 5-6
Initial Study/Mitigated Negative Declaration January 2023 SWRCB (State Water Resources Control Board), 2017. Final 2014/2016 California Integrated Report (Clean Water Act Section 303(d) List / 305(b) Report). Accessed online at https://www.waterboards.ca.gov/water_issues/programs/water_quality_assessment/#i mpaired, on November 23, 2022.

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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.

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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.

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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.

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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.

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). 2022. WATERS GeoViewer. Available at https://www.epa.gov/waterdata/waters-geoviewer. Accessed on January 29, 2022.

USFWS (United States Fish and Wildlife Service). 2021a. Information for Planning, and Consultation (IPaC), IPaC Resource List. January 5, 2022. Retrieved from http://ecos.fws.gov/ipac/ Accessed on January 5, 2022.

 SECTION 5.0 – REFERENCES 
7091/ Allen-Cataract Warehouse Project Page 5-7
Initial Study/Mitigated Negative Declaration January 2023 USFWS. 2022b. Carlsbad Fish and Wildlife Office. Official Species List: Consultation Code: 083CAR00- 2022-SLI-0369. Carlsbad, California. Retrieved from http://ecos.fws.gov/ipac/. Accessed on January 22, 2022.

USFWS. 2022c.. National Wetlands Inventory (NWI) website, U.S. Department of the Interior, Fish and Wildlife Service, Washington, D.C. Retrieved from https://www.fws.gov/wetlands/.

Accessed on January 29, 2022.

USFWS . 2021d. Critical Habitat Portal. Available at http://ecos.fws.gov/crithab/. Accessed on December 21, 2021.

USFWS. 2022e. USFWS ECOS: Environmental Conservation Online System Species Reports. Available at https://ecos.fws.gov/ecp/species-reports. Accessed on January 29, 2022.

USGS (U.S. Geological Survey), 2018. San Dimas, California 7.5-Minute Series Quadrangle [map].

Prepared for The National Map. Scale 1:24,000. Available at https://ngmdb.usgs.gov/topoview/. Downloaded on December 15, 2021.

USGS (U.S. Geological Survey). 2021a. National Hydrography Dataset (ver. USGS National Hydrography Dataset Best Resolution (NHD) for Hydrologic Unit (HU) 8. Available at https://www.usgs.gov/core-science-systems/ngp/national-hydrography/access-nationalhydrography-products.

USGS, 2022. Areas of Land Subsidence in California. Accessed online at https://ca.water.usgs.gov/land_subsidence/california-subsidence-areas.html, on March 15, 2022.

WBWG (Western Bat Working Group). 2005. WBWG News: Volume 1, Issue 1. Accessed at http://wbwg.org/wp-content/uploads/2015/03/December-2005.pdf, on January 14, 2022.

WM (Waste Management Solutions), 2022. Accessed online at https://www.wm.com/us/en/location/ca/san-dimas/trash-pickup-san-dimas-ca, on November 23, 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
Zeiner, D.C., W.F. Laudenslayer, Jr., K.E. Mayer, and M. White, eds. 1988-1990. California's Wildlife.

Vol. I-III. California Depart of Fish and Game, Sacramento, California.

 SECTION 6.0 – LIST OF PREPARERS 
7091/ Allen-Cataract Warehouse Project Page 6-1
Initial Study/Mitigated Negative Declaration January 2023

6.0 LIST OF PREPARERS

6.1 Lead Agency (CEQA)
Anne Nguyen, Associate Planner
City of San Dimas
245 East Bonita Avenue
San Dimas, CA 91773
909.394.6255
[email protected]

6.2 Project Applicant
Ignacio Crespo
7901 Crossway Drive
Pico Rivera, CA 90660

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
Hina Gupta, MURP, LEED AP, Senior Project Manager

6.3.2 Technical Team
Michael Milroy, M.S., Project Manager
Billye Breckenridge, B.A., Deputy Project Manager
Victor Paitimusa, B.A., Assistant Project Manager
Steve Borjeson, B.A., Senior Planner
Michelle Tollett, B.A., Senior Biologist
Allison Carver, B.S./B.A., Senior Biologist
Matthew Sutton, Staff Biologist
Michael Rogozen, D. Env, Senior Principal Engineer
Isha Shah, M.S., Staff Engineer
Amir Ayati, B.S., Staff Scientist
Swarna Kumaresan, M.S., Environmental Engineer
Stephen O’Neil, M.A., RPA, Cultural Resources Manager
Megan Black Doukakis, M.A., Archaeological Technician
Gulben Kaplan, GIS Analyst
Andrew Soto, B.A., Word Processing/Technical Editing
David Luhrsen, B.S., Word Processing/Administrative Assistant

6.3.3 Other Firms
Fehr & Peers – Traffic Impact Analysis
Ryan Liu, EIT, Senior Transportation Engineer

 SECTION 7.0 - MITIGATION MONITORING & REPORTING PROGRAM  7091/ Allen-Cataract Warehouse Project Page 7-1
Initial Study/Mitigated Negative Declaration January 2023

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 the 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.

The following subjects require mitigation:

Biological Resources
Cultural Resources
Geology and Soils
Hazards and Hazardous Materials
Noise
Tribal Cultural Resources
Mandatory Findings of Significance
The following subjects do not require mitigation:

Aesthetics
Agriculture and Forestry
Air Quality
Energy
Greenhouse Gas Emissions
Hydrology and Water Quality
Land Use and Planning
Mineral Resources
Population and Housing
Public Services
Recreation
Transportation
Utilities and Services
Wildfire
Table 7.0-1 lists impacts, mitigation measures, and project improvement measures adopted by the City of San Dimas in connection with the approval of the proposed project, the 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.

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Initial Study/Mitigated Negative Declaration January 2023 Table 7.0-1

MITIGATION MONITORING AND REPORTING PROGRAM

TOPICAL AREA
IMPACT

MITIGATION MEASURE

RESPONSIBLE
/

MONITORING
PARTY

MONITORING
ACTION

1. ENFORCEMENT
AGENCY

2. MONITORING
AGENCY

3. MONITORING
PHASE

4.4 Biological Resources
Threshold 4.4a) Would
the project have a
substantial 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
Department of Fish and
Game or U.S. Fish and
Wildlife Service?
MM BIO-1: Pre-Construction Breeding Bird Survey
If construction is anticipated to commence during the
nesting season (between January 1 and August 31 of any
given year, or as determined by a local CDFW office), a qualified avian biologist shall conduct a preconstruction nesting bird survey no earlier than one week prior to
construction.

To be in compliance with the MBTA and Fish and Game
Code, and to avoid impacts or take of migratory non-game breeding birds, their nests, young, and eggs, the following measures will be implemented. The measures below will
help to reduce direct and indirect impacts caused by
construction on migratory non-game breeding birds to less than significant levels.
• Project activities that will remove or disturb potential nest sites, such as open ground, trees, shrubs, grasses, and burrows, during the breeding season would be a
potentially significant impact if migratory non-game
breeding birds are present. Project activities that will remove or disturb potential nest sites will be scheduled outside the breeding bird season to avoid potential
direct impacts on migratory non-game breeding birds
protected by the MBTA and Fish and Game Code. The
breeding bird nesting season is typically from February Project
Applicant
Field
Verification

1. City of San
Dimas

2. City of San
Dimas

3. Prior to the Start
of Project
Construction

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TOPICAL AREA
IMPACT

MITIGATION MEASURE

RESPONSIBLE
/

MONITORING
PARTY

MONITORING
ACTION

1. ENFORCEMENT
AGENCY

2. MONITORING
AGENCY

3. MONITORING
PHASE
15 through September 15 but can vary slightly from
year to year, usually depending on weather conditions.

Removing all physical features that could potentially
serve as nest sites will also help to prevent birds from nesting within the project site during the breeding
season and during construction activities.
• If project activities cannot be avoided from February 15 through September 15, a qualified biologist will conduct a pre-construction breeding bird survey for breeding
birds and active nests or potential nesting sites within the limits of project disturbance. The survey will be
conducted at least seven days prior to the onset of
scheduled activities, such as mobilization and staging. It will end no more than three days prior to vegetation,
substrate, and structure removal and/or disturbance.
• If no breeding birds or active nests are observed during the pre-construction survey or they are observed and
will not be impacted, project activities may begin and no further mitigation will be required.
• If a breeding bird territory or an active bird nest is located during the pre-construction survey and will
potentially be impacted, the site will be mapped on
engineering drawings, and a no-activity buffer zone will be marked (fencing, stakes, flagging, orange snow
fencing, etc.) a minimum of 100 feet in all directions or 500 feet in all directions for listed bird species and all raptors. The biologist will determine the appropriate
buffer size based on the type of activities planned near the nest and the type of bird that created the nest. Some

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Initial Study/Mitigated Negative Declaration January 2023

TOPICAL AREA
IMPACT

MITIGATION MEASURE

RESPONSIBLE
/

MONITORING
PARTY

MONITORING
ACTION

1. ENFORCEMENT
AGENCY

2. MONITORING
AGENCY

3. MONITORING
PHASE
bird species are more tolerant than others of noise and activities occurring near their nest. The buffer zone will not be disturbed by construction or other activity 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 the project site during the pre-construction survey, the biologist will
immediately map the area and notify the appropriate
resource agency to determine suitable protection
measures and/or mitigation measures and to
determine if additional surveys or focused protocol
surveys are 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.

Threshold 4.4e)
Conflict with any local
policies or ordinances
protecting biological
MM BIO-2: Mature Significant Tree Replacement
Measure Project
Applicant
Field
Verification

1. City of San Dimas

2. City of San Dimas

3. During

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IMPACT

MITIGATION MEASURE

RESPONSIBLE
/

MONITORING
PARTY

MONITORING
ACTION

1. ENFORCEMENT
AGENCY

2. MONITORING
AGENCY

3. MONITORING
PHASE
resources, such as a tree
preservation policy or
ordinance?
There are 19 trees on the project site that are designated as mature significant trees as per the City’s tree preservation ordinance (City of San Dimas, 2006), 17 of which are
proposed for removal. The following species and number
per species of mature significant trees are proposed for removal: one bishop pine, eleven pepper trees, three white ash, one Mexican fan palm, and one carrotwood.

Section 18.162.060 Conditions Imposed of the tree
preservation ordinance state that mature significant trees must be replaced using a two-to-one ratio with trees that are 15-gallon box trees, or other replacement of equivalent value and size, or as the City deems appropriate. It further states that the replacement trees will be planted within the project site unless the City approves offsite planting. Thus, to replace the 17 mature significant trees that will be removed during the construction of the project, the project proponent will plant 34 fifteen-gallon box trees on the project site. All replacement trees need to be maintained by the project proponent for two years and all other
monitoring and maintenance requirements of this section of the tree preservation ordinance must be followed.

Furthermore, granting of the tree removal permit is
contingent upon meeting the conditions of Section 18.162. 070 Required Findings, of the tree preservation ordinance.

Construction and
two-years post
Project
Construction

4.5 Cultural Resources
Threshold 4.5a)
Would the
project cause a
substantial adverse
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
Project
Applicant
Field
Verification

1. City of San
Dimas

2. City of San

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IMPACT

MITIGATION MEASURE

RESPONSIBLE
/

MONITORING
PARTY

MONITORING
ACTION

1. ENFORCEMENT
AGENCY

2. MONITORING
AGENCY

3. MONITORING
PHASE
change in the
significance of a
historical resource
pursuant to § 15064.5?
archaeologist regarding the potential for sensitive
archaeological and paleontological resources to be
unearthed 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 on the area’s environmental conditions and the
environmental protection measures that must be adhered to by all workers throughout the duration of 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 attend 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 is added to the project later, the construction foreman shall ensure that new personnel receives training before they start working. The archaeologist shall provide hard copies of the WEAP presentation to the construction foreman.

Dimas

3. Prior to Project
Construction

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IMPACT

MITIGATION MEASURE

RESPONSIBLE
/

MONITORING
PARTY

MONITORING
ACTION

1. ENFORCEMENT
AGENCY

2. MONITORING
AGENCY

3. MONITORING
PHASE
MM CUL-2: 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 time to recover, analyze, and curate the find(s). 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 afford the necessary time and funds to recover, analyze, and curate the find(s). Construction activities may continue on other parts of the site while the evaluation and treatment of historical or unique archaeological resources take place.

Project
Applicant
Field
Verification

1. City of San
Dimas

2. City of San
Dimas

3. During Project
Construction
Threshold 4.5b) Would
the 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.

Refer to
mitigation
measures CUL1 and CUL-2
above.

Refer to
mitigation
measures CUL1 and CUL-2
above.

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

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TOPICAL AREA
IMPACT

MITIGATION MEASURE

RESPONSIBLE
/

MONITORING
PARTY

MONITORING
ACTION

1. ENFORCEMENT
AGENCY

2. MONITORING
AGENCY

3. MONITORING
PHASE
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 San
Bernardino County Coroner will be notified (§ 5097.98 of the Public Resources Code). The Coroner will determine
whether the remains are of 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 will contact the Native American Heritage Commission (NAHC). The NAHC will be responsible for
designating the Most Likely Descendant (MLD). The MLD
(either an individual or sometimes a committee) will be responsible for the ultimate disposition of the remains, as required by § 7050.5 of the California Health and Safety Code. The MLD will 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).

Project
Applicant
Field
Verification

1. City of San
Dimas

2. City of San
Dimas

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: The project applicant shall retain a qualified paleontologist, prior to the issuance of building/grading permit, to remain on-call during project ground-disturbing activities. If paleontological resources are uncovered during project construction, the contractor shall halt construction activities within 50 feet of the find 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). The paleontologist shall curate the find(s) at an accredited repository for paleontological resources such as Project
Applicant
Field
Verification

1. City of San
Dimas

2. City of San
Dimas

3. Prior to the
issuance of
building permits
and during
Project

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TOPICAL AREA
IMPACT

MITIGATION MEASURE

RESPONSIBLE
/

MONITORING
PARTY

MONITORING
ACTION

1. ENFORCEMENT
AGENCY

2. MONITORING
AGENCY

3. MONITORING
PHASE
the Western Science Center near Hemet or the San
Bernardino County Museum. Subsequently, the monitor
shall remain onsite for the duration of the ground
disturbance to ensure the protection of any other resources that are found during construction on the project site.

Construction

4.9 Hazards and Hazardous Materials
Threshold 4.9a) Would
the project create a
significant hazard to the
public or the
environment through the
routine transport, use, or
disposal of hazardous
materials?
MM HAZ-1: In the event that the future tenant will handle hazardous materials above the reportable quantity
threshold, the lease agreement with the future tenant shall require the tenant to submit a Hazardous Materials Business Plan which would include an inventory of all hazardous
materials used, stored, or otherwise managed onsite to the Los Angeles County Fire Department – Health Hazardous
Materials Division. The recommendations of the Hazardous Materials Business Plan would be included in the lease
agreement (signed by the tenant) as mandatory measures
required to be implemented by the tenant.

Future Tenant
Review and
Approval of
Hazardous
Materials
Business Plan

1. Los Angeles
County Fire
Department –
Health
Hazardous
Materials
Division

2. City of San
Dimas

3. PostConstruction
MM HAZ-2: In the event that the future tenant will handle hazardous materials above the reportable quantity
threshold, the lease agreement with the future tenant shall require the tenant, in coordination with the City of San Dimas, to identify routes along which hazardous materials may routinely be transported. If essential facilities such as schools, hospitals, child care centers, or other facilities with special evacuation needs are located along these routes, the future tenant shall develop an emergency response plan
that can be implemented in the event of an unauthorized release of hazardous materials. The recommendations of
the Emergency Response Plan would be included in the
Future Tenant
Review and
Approval of
Emergency
Response Plan

1. Los Angeles
County Fire
Department –
Health
Hazardous
Materials
Division

2. City of San
Dimas

3. PostPage 841 – 929
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IMPACT

MITIGATION MEASURE

RESPONSIBLE
/

MONITORING
PARTY

MONITORING
ACTION

1. ENFORCEMENT
AGENCY

2. MONITORING
AGENCY

3. MONITORING
PHASE
lease agreement (signed by the future tenant) as mandatory measures required to be implemented by the future tenant.

Construction
Threshold 4.9b): Would
the project create a
significant hazard to the
public or the
environment through
reasonably foreseeable
upset and accident
conditions involving the
release of hazardous
materials into the
environment?
Refer to mitigation measures HAZ-1 and HAZ-2 above.

Refer to
mitigation
measures HAZ1 and HAZ-2
above.

Refer to
mitigation
measures HAZ1 and HAZ-2
above.

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

4.13 Noise
Threshold 4.13a):

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?
MM N-1: The construction contractor will use the
following source controls when working within 600
feet of occupied residential buildings:
 Use of noise-producing equipment will be limited to the interval from 7:00 a.m. to 6:00 p.m. on weekdays, 8:00
a.m. to 5:00 p.m. on Saturdays, with no construction on Sundays.
 For all noise-producing equipment, use types and
models that have the lowest horsepower and the lowest
noise generating potential practical for their intended use.
 The construction contractor will ensure that all
construction equipment, fixed or mobile, is properly
Project
Applicant and
Construction
Contractor
Field
Verification

1. City of San Dimas

2. City of San Dimas

3. During Project
Construction

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IMPACT

MITIGATION MEASURE

RESPONSIBLE
/

MONITORING
PARTY

MONITORING
ACTION

1. ENFORCEMENT
AGENCY

2. MONITORING
AGENCY

3. MONITORING
PHASE
operating (tuned-up) and lubricated, and that mufflers
are working adequately.
 Have only necessary equipment onsite.
 Use manually-adjustable or ambient-sensitive backup
alarms.

MM N-2: When working near adjacent residential uses, the construction contractor will also use the following path controls, except where not physically feasible, when
needed:
 Install portable noise barriers, including solid
structures and noise blankets, between the active noise sources and the nearest noise receivers.
 Temporarily enclose localized and stationary noise
sources.
 Store and maintain equipment, building materials, and waste materials as far as practical from as many
sensitive receivers as practical.

Project
Applicant and
Construction
Contractor
Field
Verification

1. City of San Dimas

2. City of San Dimas

3. During Project
Construction

4.18 Tribal Cultural Resources
Threshold 4.18a):

Cause a substantial
adverse change in the
significance of a tribal
cultural resource,
defined in Public
Resources Code section
21074 as either a site,
MM TCR-1: Retain a Native American Monitor Prior to
Commencement of Ground-Disturbing Activities
A. The project applicant/lead agency shall retain a Native American Monitor from or approved by the Gabrieleño
Band of Mission Indians – Kizh Nation. The monitor
shall be retained prior to the commencement of any
“ground-disturbing activity” for the subject project at Project
Applicant
Field
Verification,
Review, and
Approval of
Cultural
Resources
Management
Plan

1. Native American
Tribes and the
City of San
Dimas

2. City of San
Dimas

3. During

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IMPACT

MITIGATION MEASURE

RESPONSIBLE
/

MONITORING
PARTY

MONITORING
ACTION

1. ENFORCEMENT
AGENCY

2. MONITORING
AGENCY

3. MONITORING
PHASE
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:
(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.
all project locations (i.e., both on-site and any off-site locations that are included in the project
description/definition and/or required in connection
with the project, such as public improvement work).
“Ground-disturbing activity” shall include, but is not
limited to, demolition, pavement removal, potholing,
auguring, grubbing, tree removal, boring, grading,
excavation, drilling, and trenching into native soil and undocumented soils. The monitor(s) will continue
their duties until it is determined through consultation with the permittee, City Planning, that monitoring is
no longer warranted.

B. A copy of the executed monitoring agreement shall be submitted to the lead agency prior to the earlier
commencement of any ground-disturbing activity, or
the issuance of any permit necessary to commence a
ground-disturbing activity.

C. The monitor will complete daily monitoring logs that will provide descriptions of the relevant grounddisturbing activities, the type of construction activities performed, locations of ground-disturbing activities,
soil types, cultural-related materials, and any other
facts, conditions, materials, or discoveries of
significance to the Tribe. Monitor logs will identify and describe any discovered TCRs, including but not
limited to, Native American cultural and historical
artifacts, remains, places of significance, etc.,
(collectively, tribal cultural resources, or “TCR”), as well as any discovered Native American (ancestral)
human remains and burial goods. Copies of monitor
Construction

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Initial Study/Mitigated Negative Declaration January 2023

TOPICAL AREA
IMPACT

MITIGATION MEASURE

RESPONSIBLE
/

MONITORING
PARTY

MONITORING
ACTION

1. ENFORCEMENT
AGENCY

2. MONITORING
AGENCY

3. MONITORING
PHASE
logs will be provided to the project applicant/lead
agency upon written request to the Tribe.

D. On-site tribal monitoring shall conclude upon the
latter of the following (1) written confirmation to the Kizh from a designated point of contact for the project applicant/lead agency that all ground-disturbing
activities and phases that may involve grounddisturbing activities on the project site or in connection with the project are complete; or (2) a
determination and written notification by the Kizh to
the project applicant/lead agency that no future,
planned construction activity and/or
development/construction phase at the project site
possesses the potential to impact Kizh TCRs.

E. Upon discovery of any TCRs, all construction activities in the immediate vicinity of the discovery shall cease
(i.e., not less than the surrounding 50 feet) and the City notified. Construction activities may continue in other areas outside of the designated protection zone, which
shall be delineated with cones, flagging, or fencing.

The designated Kizh monitor and/or Kizh
archaeologist shall evaluate the significance of the find and determine whether the resource uncovered is a
TCR. If its determined that the potential resource is a TCR (as defined by PRC, Section 21074), tribes
consulting under AB 52 would be provided a
reasonable period of time, typically 5 days from the
date of a new discovery is made, to conduct a site visit and make recommendations regarding future ground
disturbance activities as well as the treatment of any

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IMPACT

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/

MONITORING
PARTY

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ACTION

1. ENFORCEMENT
AGENCY

2. MONITORING
AGENCY

3. MONITORING
PHASE
discovered TCRs. The designated tribe
monitor/archaeologist shall implement a plan for the
treatment and disposition of any discovered TCRs
based on the nature of the resource and considering
the recommendations of the tribe(s). Implementation
of proposed recommendations will be made based on
the determination of the City that the approach is
reasonable and feasible. The Kizh will recover and
retain all discovered TCRs in the form and/or manner
the Tribe deems appropriate, in the Tribe’s sole
discretion, and for any purpose, the Tribe deems
appropriate, including for educational, cultural,
and/or historic purposes.

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/

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PARTY

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1. ENFORCEMENT
AGENCY

2. MONITORING
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3. MONITORING
PHASE
MM TCR-2: Unanticipated Discovery of Human
Remains and Associated Funerary Objects
A. Native American human remains are defined in PRC
5097.98 (d)(1) as an inhumation or cremation and
in any state of decomposition or skeletal
completeness. Funerary objects, called associated
grave goods in Public Resources Code Section
5097.98, are also to be treated according to this
statute.

B. If Native American human remains and/or grave
goods are discovered or recognized on the project
site, then all construction activities shall
immediately cease. Health and Safety Code Section
7050.5 dictates that any discoveries of human
skeletal material shall be immediately reported to
the County Coroner and all ground-disturbing
activities shall immediately halt and shall remain
halted until the coroner has determined the nature
of the remains. If the coroner recognizes the human
remains to be those of a Native American or has
reason to believe they are Native American, he or
she shall contact, by telephone within 24 hours, the
Native American Heritage Commission, and Public
Resources Code Section 5097.98 shall be followed.

C. Human remains and grave/burial goods shall be
treated alike per California Public Resources Code
section 5097.98(d)(1) and (2).

D. Construction activities may resume in other parts
of the project site at a minimum of 200 feet away
Project
Applicant
Field
Verification,
Review, and
Approval of
Cultural
Resources
Management
Plan

1. Native American
Tribes and the
City of San
Dimas

2. City of San
Dimas

3. During
Construction

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/

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PARTY

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AGENCY

2. MONITORING
AGENCY

3. MONITORING
PHASE
from discovered human remains and/or burial
goods, if the Kizh determines in its sole discretion
that resuming construction activities at that
distance is acceptable and provides the project
manager express consent of that determination
(along with any other mitigation measures the Kizh
monitor and/or archaeologist deems necessary).
(CEQA Guidelines Section 15064.5(f).)
E. Preservation in place (i.e., avoidance) is the
preferred manner of treatment for discovered
human remains and/or burial goods. Any historic
archaeological material that is not Native American
in origin (non-TCR) shall be curated at a public,
non-profit institution with a research interest in the
materials, such as the Natural History Museum of
Los Angeles County or the Fowler Museum if such
an institution agrees to accept the material. If no
institution accepts the archaeological material, it
shall be offered to a local school or historical society in the area for educational purposes.

F. Any discovery of human remains/burial goods shall
be kept confidential to prevent further disturbance.

MM TCR -3: Procedures for Burials and Funerary
Remains:

A. As the Most Likely Descendant (“MLD”), the Koo-nasgna Burial Policy shall be implemented. To the Tribe, the term “human remains” encompasses more than human
bones. In ancient as well as historic times, Tribal
Project
Applicant
Field
Verification,
Review, and
Approval of
Cultural
Resources
Management

1. Native American
Tribes and the
City of San
Dimas

2. City of San
Dimas

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/

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PARTY

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AGENCY

2. MONITORING
AGENCY

3. MONITORING
PHASE
Traditions included, but were not limited to, the
preparation of the soil for burial, the burial of funerary objects with the deceased, and the ceremonial burning
of human remains.

B. If the discovery of human remains includes four or more burials, the discovery location shall be treated as a
cemetery and a separate treatment plan shall be
created.

C. The prepared soil and cremation soils are to be treated in the same manner as bone fragments that remain
intact. Associated funerary objects are objects that, as part of the death rite or ceremony of a culture, are
reasonably believed to have been placed with individual human remains either at the time of death or later;
other items made exclusively for burial purposes or to
contain human remains can also be considered as
associated funerary objects. Cremations will either be
removed in bulk or by means as necessary to ensure
complete recovery of all sacred materials.

D. In the case where discovered human remains cannot be fully documented and recovered on the same day, the
remains will be covered with muslin cloth and a steel
plate that can be moved by heavy equipment placed
over the excavation opening to protect the remains. If
this type of steel plate is not available, a 24-hour guard should be posted outside of working hours. The Tribe
will make every effort to recommend diverting the
project and keeping the remains in situ and protected. If Plan 3. During
Construction

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/

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the project cannot be diverted, it may be determined
that burials will be removed.

E. In the event preservation in place is not possible despite good faith efforts by the project applicant/developer
and/or landowner, before ground-disturbing activities
may resume on the project site, the landowner shall
arrange a designated site location within the footprint of the project for the respectful reburial of the human remains and/or ceremonial objects. Construction
activities may continue in other areas outside of the
designated protection zone, which shall be delineated
with cones, flagging, or fencing.

F. Each occurrence of human remains and associated
funerary objects will be stored using opaque cloth bags.

All human remains, funerary objects, sacred objects,
and objects of cultural patrimony will be removed to a
secure container on site if possible. These items should be retained and reburied within six months of recovery.

The site of reburial/repatriation shall be on the project site but at a location agreed upon between the Tribe and the landowner at a site to be protected in perpetuity.

There shall be no publicity regarding any cultural
materials recovered.

G. The Tribe will work closely with the project’s qualified archaeologist to ensure that the excavation is treated
carefully, ethically, and respectfully. If data recovery is approved by the Tribe, documentation shall be
prepared and shall include (at a minimum) detailed
descriptive notes and sketches. All data recovery data
recovery-related forms of documentation shall be

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approved in advance by the Tribe. If any data recovery
is performed, once complete, a final report shall be
submitted to the applicant, the City, the South Central Coastal Information Center, the Tribe and the NAHC.

The Tribe does NOT authorize any scientific study or the utilization of any invasive and/or destructive
diagnostics on human remains.

MM TCR-4: Prior to the commencement of any grounddisturbing activity at the project site, the project applicant shall retain a Native American Monitor from a local
culturally-affiliated Gabrielino (Tongva) tribe. A copy of the executed contract shall be submitted to the City of San Dimas Planning Division prior to the issuance of any permit necessary to commence a ground-disturbing activity.

Project
Applicant
Field
Verification,
Review, and
Approval of
Cultural
Resources
Management
Plan

1. Native American
Tribes and the
City of San
Dimas

2. City of San
Dimas

3. During
Construction
MM TCR-5: The Tribal monitor shall only be present on-site during the construction phases that involve grounddisturbing activities. Ground disturbing activities are defined by the Tribe as activities that may include but are not limited to, pavement removal, potholing or auguring, grubbing, tree removals, boring, grading, excavation,
drilling, and trenching, within the project area. The Tribal Monitor will complete daily monitoring logs that will
provide descriptions of the day’s activities, including construction activities, locations, soil, and any cultural materials identified. The on-site monitoring shall end when all ground-disturbing activities on the Project Site are completed, or when the Tribal Representatives and Tribal Monitor have indicated that all upcoming ground-disturbing Project
Applicant
Field
Verification,
Review, and
Approval of
Cultural
Resources
Management
Plan

1. Native American
Tribes and the
City of San
Dimas

2. City of San
Dimas

3. During
Construction

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/

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PARTY

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ACTION

1. ENFORCEMENT
AGENCY

2. MONITORING
AGENCY

3. MONITORING
PHASE
activities at the Project Site have little to no potential for impacting Tribal Cultural Resources.

MM TCR-6: Upon discovery of a Tribal Cultural Resource, construction activities shall cease in the immediate vicinity of the find (not less than the surrounding 60 feet) until the find can be assessed. All Tribal Cultural Resources
unearthed by project activities shall be evaluated by the qualified archaeologist and Tribal monitor as described in MM TCR-4. If the resources are Native American in origin, the monitoring Tribe may retain it/them in the form and/or manner the Tribe deems appropriate, for educational,
cultural, and/or historic purposes.

Project
Applicant
Field
Verification,
Review, and
Approval of
Cultural
Resources
Management
Plan

1. Native American
Tribes and the
City of San
Dimas

2. City of San
Dimas

3. During
Construction
MM TCR-7: If human remains are encountered during
excavations associated with this project, all work shall stop within a 60-foot radius of the discovery, and the Los Angeles County Coroner will be notified (§ 5097.98 of the Public Resources Code). The Coroner will determine whether the remains are of 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 will contact the NAHC. The NAHC will be responsible for designating the Most Likely Descendant
(MLD). The MLDS (either an individual or sometimes a
committee) will be responsible for the ultimate disposition of the remains, as required by § 7050.5 of the California Health and Safety Code. The MLD will make
recommendations within 24 hours of their notification by the NAHC. These recommendations may include scientific
removal and nondestructive analysis of human remains and Project
Applicant
Field
Verification,
Review, and
Approval of
Cultural
Resources
Management
Plan

1. Native American
Tribes and the
City of San
Dimas

2. City of San
Dimas

3. During
Construction

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IMPACT

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/

MONITORING
PARTY

MONITORING
ACTION

1. ENFORCEMENT
AGENCY

2. MONITORING
AGENCY

3. MONITORING
PHASE
items associated with Native American burials (§ 7050.5 of the Health and Safety Code).

RESPONSES TO COMMENTS
Initial Study and Mitigated Negative Declaration
(IS/MND)
Allen-Cataract Warehouse Project
Development Plan Review Board Case No. 21-0002
Zone Change Case No. 21-0001
Tree Removal Program Case No. 21-0004
Lot Merger Case No. 21-0001
Prepared for:

CITY OF SAN DIMAS
City of San Dimas Planning Division
245 E. Bonita Avenue
San Dimas, CA 91773
Telephone: (909) 394-6256
Prepared by:

UltraSystems Environmental Inc.
16431 Scientific Way
Irvine, CA 92618-4355
Telephone: (949) 788-4900
FAX: (949) 788-4901
April 2023
Project No. 7091

 TABLE OF CONTENTS 
7091/Allen Cataract Warehouse IS/MND Page i
Responses to Comments April 2023

TABLE OF CONTENTS

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

2.0 LIST OF COMMENTS/RESPONSE TO COMMENTS ..................................................................... 2-1

ATTACHMENTS
Attachment Public Comments
Attachment A Shelley Rouse
Attachment B Yuhaaviatam of San Manuel Nation

 RESPONSES TO COMMENTS 
7091/Allen Cataract Warehouse IS/MND Page 1-1
Responses to Comments April 2023

1.0 INTRODUCTION
This Responses to Comments (RTC) document, in conjunction with the Draft Initial Study/Mitigated Negative Declaration (IS/MND) responds to comments on the proposed Allen Cataract Warehouse Project (project). While the State of California Environmental Quality Act (CEQA) Guidelines do not require a final initial study or the preparation of formal responses to comments received during the public review period for an Initial Study/Mitigated Negative Declaration,1 the City of San Dimas (City) is making available responses to the comments it received during the public review process, to provide further disclosure about the proposed project.

This document provides responses to comments received on the IS/MND. A total of two comment letters (e-mail) were received and are summarized in Section 2.0, Public Comment Letters. The letters are included as Attachments A and B of this document. 1 CEQA only requires the lead agency to respond to comments that are received in response to an environmental impact report (Title 14, California Code of Regulations, § 15088, Evaluation of and Response to Comments).

 RESPONSES TO COMMENTS 
7091/Allen Cataract Warehouse IS/MND Page 2-1
Responses to Comments April 2023

2.0 LIST OF COMMENTS/RESPONSE TO COMMENTS
This section includes a list of persons, organizations and public agencies that submitted comments on the IS/MND and their respective responses. When comments did not address the completeness or adequacy of the environmental documentation or when they did not raise environmental issues, the receipt of the comment is noted; no further response is provided as CEQA does not require a response in these instances.

The following written comments were received on the IS/MND, during the public review period. The comment letters are provided in Attachments A and B of this document.

Letter Agency, Organization, or Individual Date
A Shelley Rouse 3/13/2023
Comment A-1:

I’m concerned with this project as it is located across the street from my house at 320 W Allen Ave. It’s already challenging getting in and out of our driveway, having a commercial driveway with possible congestion issue is not acceptable.

Allen Ave is already busier than it never imagined would happen when moving in almost 30 years ago.

Response A-1:

This comment is noted. This comment does not raise any environmental issues addressed under the scope of CEQA analysis.

Comment A-2 According to the environmental report “staff has determined that this project will not have significant effect on the environment.“ Put yourselves in our shoes, would this project in reality truly not have significant effect? Response A-2 CEQA Guidelines Section 15382 sets forth the following definition for significant effect: “Significant effect on the environment” means a substantial, or potentially substantial, adverse change [emphasis added] in any of the physical conditions within the area affected by the project…” Under this definition, the project will not have a significant effect.

Comment A-3 Another concern is losing the parking in front of our house. My comments are most likely insignificant for this project considering they have already started working to remove the houses across the street. We expect the City of San Dimas will make sure this business and customers do not park on the south side of Allen.

Response A-3 Onsite parking for the project must meet standards in the San Dimas Municipal Code. Public on-street parking restrictions are beyond the scope of CEQA analysis.

B Ryan Nordness/Yuhaaviatam of San Manuel Nation 3/22/2023 Comment B-1:

The proposed project is located outside of Serrano ancestral territory and, as such, YSMN will not be requesting to receive consulting party status with the lead agency or to participate in the scoping, development, or review of documents created pursuant to legal and regulatory mandates.

Response B-1 This comment is noted. This comment does not raise any environmental issues.

 RESPONSES TO COMMENTS 
7091/Allen Cataract Warehouse IS/MND Page 2-2
Responses to Comments April 2023

ATTACHMENT A

From: Shelley Rouse
To: Anne Nguyen
Subject: San Dimas Notice of Intent on Allen and Cataract Project Date: Monday, March 13, 2023 2:55:27 PM
Attachments: San Dimas Notice of Intent.docx
CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe. Report phish using Phish Alert Button.

Hello Anne,
Attached is my comments for the pending project across the street from my house.

Kindly send my comments to applicable departments.

Have a wonderful day!
Shelley Rouse

Aten�on: Planning and Development Departments
Re: No�ce of Intent to Adopt a Mi�gated Nega�ve Declara�on I’m concerned with this project as it is located across the street from my house at 320 W Allen Ave.

It’s already challenging ge�ng in and out of our driveway, having a commercial driveway with possible conges�on issue is not acceptable.

Allen Ave is already busier than it never imagined would happen when moving in almost 30 years ago.

According to the environmental report “staff has determined that this project will not have significant effect on the environment. “ Put yourselves in our shoes, would this project in reality truly not have significant effect?
Another concern is losing the parking in front of our house. My comments are most likely insignificant for this project considering they have already started working to remove the houses across the street.

We expect the City of San Dimas will make sure this business and customers do not park on the south side of Allen.

Appreciate your �me on our concerns.

Shelley Rouse
[email protected]

 RESPONSES TO COMMENTS 
7091/Allen Cataract Warehouse IS/MND Page 2-3
Responses to Comments April 2023

ATTACHMENT B

You don't often get email from [email protected]. Learn why this is important Subject: Tribal Response for the MND for the Allen-Cataract Warehouse Project, Case 21-0002 CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe. Report phish using Phish Alert Button.

Dear Anne,
Thank you for contacting the Yuhaaviatam of San Manuel Nation (formerly known as the San Manuel Band of Mission Indians) regarding the above-referenced project. YSMN appreciates the opportunity to review the project documentation, which was received by the Cultural Resources Management Department on March 3rd 2023. The proposed project is located outside of Serrano ancestral territory and, as such, YSMN will not be requesting to receive consulting party status with the lead agency or to participate in the scoping, development, or review of documents created pursuant to legal and regulatory mandates.

Kind regards,
Ryan Nordness
Cultural Resource Analyst
Yuhaaviatam of San Manuel Nation
Ryan Nordness
Cultural Resource Analyst
[email protected]
O:(909) 864-8933 Ext 50-2022
M:(909) 838-4053
26569 Community Center Dr Highland, California 92346
From: Ryan Nordness <[email protected]>
Sent: Wednesday, March 22, 2023 11:29 AM
To: Anne Nguyen <[email protected]>

ATTACHMENT 2
ORDINANCE 1306

AN ORDINANCE OF THE CITY OF SAN DIMAS, COUNTY OF LOS ANGELES, APPROVING ZONE CHANGE 21-0001, A REQUEST TO CHANGE THE ZONE FROM LIGHT AGRICULTURE (AL) TO LIGHT MANUFACTURING (M-1) FOR THE PROPERTIES LOCATED AT 309 W. ALLEN AVENUE, 917 N. CATARACT AVENUE, AND 929 N. CATARACT AVENUE (APN’S: 8392-016-008, -048, 047).

WHEREAS, a Zone Change has been duly initiated by:

Ignacio Crespo
OC Design & Engineering
7901 Crossway Drive
Pico Rivera, CA 90660
WHEREAS, the Zone Change is described as a request to change the zone from Light Agriculture (AL) to Light Manufacturing (M-1); and
WHEREAS, the Zone Change would affect the the following real properties located at 309 W. Allen Avenue, 917 N. Cataract Avenue, and 929 N. Cataract Avenue (APN’S: 8392-016-008, -048, 047); and
WHEREAS, the Zone Change implements the policies of the General Plan by providing an orderly, functional, and compatible land use pattern; and WHEREAS, the proposed Zone Change is requested to provide consistency between the General Plan and Zoning Map; and
WHEREAS, on May 4, 2023, the Planning Commission held a public hearing, notice of said public hearing having been duly given as required by law to consider the Mitigated Negative Declaration and adopted Resolution PC-1666, recommending approval of the Zone Change to the City Council; and
WHEREAS, the downzoning of the three (3) residential properties leads to a reduction of three (3) lots zoned Light Agriculture (AL) which allows for one (1) single-family residence per lot, causing the No Net Loss provision, as required by Government Code section 66300,to come into effect. To satisfy this provision, Zone Change 22-0001, also approved by the City Council at their regular meeting on May 14, 2024, upzones two (2) properties in particular 327 E. Baseline Road (APN: 8661-017-010 and vacant lot APN: 8661-017-011) to create five (5) additional single-family parcels, meeting the No Net Loss provisions; and
WHEREAS, pursuant to and in accordance with the provisions of the California Environmental Quality Act (Public Resources Code Section 21000 et seq.; herein referred to as “CEQA”) the State of California Guidelines for the Implementation of the California Environmental Quality Act (commencing with Section 15000 of Title 14 of the California Code of Regulations; herein referred to as the “CEQA Guidelines”), the City is the “lead agency” for the preparation and consideration of environmental documents for the Proposed Project; and WHEREAS, a Draft Mitigated Negative Declaration was prepared in accordance with CEQA Guidelines to evaluate the physical environmental impacts of the Proposed Project. The Mitigated Negative Declaration was circulated for a 20-day public review on March 7, through March 27, 2023 and was also made available for review on the City’s website at

Ordinance 1306 Page 2
Zone Change 21-0001
May 14, 2024
www.sandimasca.gov. A complete copy of the Mitigated Negative Declaration is on file and can be viewed in the Planning Division at 245 E. Bonita Avenue, San Dimas, California; and WHEREAS, the City gave notice of its intent to adopt the Mitigated Negative Declaration to (a) the public pursuant to Section 15072(b) of the CEQA Guidelines, (b) individuals and organizations, if any, that previously submitted written requests for notice pursuant to Section 15072(b) of the CEQA Guidelines, (c) responsible and trustee and other agencies with jurisdiction over resources that will affected by the Proposed Project pursuant to Section 15073(c) of the CEQA Guidelines, and (d) the Clerk of the County of Los Angeles pursuant to Section 15072(a) of the CEQA Guidelines; and
WHEREAS, on May 14, 2024, the City Council held a public hearing, notice of said public hearing having been duly given as required by law to consider the Zone Change and to hear and consider evidence for and against the proposed Project and related actions and to investigate and make findings and recommendations in connection therewith; and NOW, THEREFORE, in consideration of the evidence received at the hearing, and for the reasons discussed by the Commissioners at the hearing, the City Council now finds as follows:

A. The proposed Zone Change will not adversely affect adjoining property as to value, precedent or be detrimental to the area.

The Zone Change will allow the development of a 63,749 square-foot concrete tilt-up warehouse/office multi-tenant building, which will be consistent with the existing light industrial buildings adjacent to the project area. The surrounding zoning to the north, east and west is currently Light Manufacturing (M-1). Additionally, the Zone Change is required pursuant to Government Code Section 65860 to provide consistency between the zoning and the General Plan Land Use designation. Therefore, the Zone Change will not adversely affect adjoining property as to value, precedent or be detrimental to the area.

B. The proposed Zone Change will further the public health, safety and general welfare.

The Zone Change will allow the development of a new 63,749 square-foot concrete tilt-up warehouse/office multi-tenant building being proposed in conjunction with this request.

The affected parcels were occupied by nine (9) single-family residences. The Zone Change will facilitate the development of a new warehouse/office building, which will provide additional job opportunities for current residents. The new development will include new infrastructure throughout the project area to include, but not limited to, storm drain and sewer, and off-site improvements such as new sidewalks and the removal of several overhead utility lines. Therefore, the Zone Change will improve the overall area and will further the public health, safety and general welfare.

C. The proposed Zone Change is consistent with the General Plan.

The proposed Zone Change from Light Agriculture (AL) to Light Manufacturing (M-1) will provide consistency between the zoning and General Plan Land Use designation, which is currently Industrial. Additionally, the Zone Change is required pursuant to Government Code Section 65860 to provide consistency between the zoning and the General Plan Land Use designation.

Ordinance 1306 Page 3
Zone Change 21-0001
May 14, 2024
The proposed Zone Change is consistent with the General Plan Land Use Element as follows:

Land Use Element Goal L-4: Plan and create an urban form that efficiently utilizes urban infrastructure and services. Plan for orderly growth rather than leap frog development.

Objective 4.1: Promote future land use and development patterns which reduce costs of infrastructure construction, encourages transit to make better use of existing facilities, and achieve a good match between future growth and phasing of existing facilities or expansion of new ones.

The proposed Zone Change will be consistent with the uses to the north, west and east, and will allow for a contiguous area of M-1 zoning, eliminating an instance of leap frog development where industrial uses surrounded a residentially zoned area. The new zoning will also help to achieve a good match between the current industrial zoned properties and new industrial development on the properties to be rezoned.

NOW, THEREFORE, BE IT FURTHER RESOLVED, PURSUANT TO THE ABOVE FINDINGS, that the City Council approves Zone Change 21-0001 changing the zoning classification for the subject properties as set forth on the Land Use Map in Exhibit “A” attached hereto.

SECTION 1. SEVERABILITY. If any section, subsection, subdivision, sentence, clause, phrase, or portion of this Ordinance is, for any reason, held to be invalid or unconstitutional by the decision of any court of competent jurisdiction, such decision shall not affect the validity of the remaining portions of this Ordinance. The City Council hereby declares that it would have adopted this Ordinance and each section, subsection, subdivision, sentence, clause, phrase, or portion thereof, irrespective of the fact that any one or more section, subsection, subdivision, sentence, clause, phrase, or portion thereof be declared invalid or unconstitutional.

SECTION 2. CEQA DETERMINATION. The City Council hereby finds and determines that is can be seen with certainty that there is no possibility that this ordinance may have a significant adverse effect on the environment. Thus, the adoption of this ordinance is exempt from the requirements of the California Environmental Quality Act (CEQA) pursuant to Section 15061(b)(3) of the CEQA Guidelines.

SECTION 3. EFFECTIVE DATE AND PUBLICATION. This Ordinance shall take effect 30 days after its final passage. The City Clerk shall certify to the adoption of this Ordinance and cause the same to be posted at the duly designated posting places within the City and published once within 15 days after passage and adoption as may be required by law in a newspaper of general circulation in the City of San Dimas hereby designated for that purpose; or, in the alternative, the City Clerk may cause to be published a summary of this Ordinance and certified copy of the text of this Ordinance shall be posted in the Office of the City Clerk five days prior to the date of adoption of this Ordinance; and, within 15 days after adoption, the City Clerk shall cause to be published, the aforementioned summary and shall post a certified copy of this Ordinance, together with the vote for and against the same, in the Office of the City Clerk.

PASSED, APPROVED AND ADOPTED at a regular meeting of the City Council of the City of San Dimas this 14th day of May, 2024, by the following vote:

Ordinance 1306 Page 4
Zone Change 21-0001
May 14, 2024
AYES:

NOES:

ABSENT:

ABSTAIN:
__________________________________
Emmett G. Badar, Mayor
ATTEST: APPROVED AS TO FORM:
__________________________ ___________________________
Debra Black, City Clerk Jeff Malawy, City Attorney
I, DEBRA BLACK, CITY CLERK of the City of San Dimas, do hereby certify that Ordinance 1306 was introduced at a regular meeting of the City Council of the City of San Dimas on the 14th day of May, 2024, and thereafter passed, approved and adopted at a regular meeting of said City Council held on the 28th day of May, 2024. ___________________________
Debra Black, City Clerk

Ordinance 1306 Page 5
Zone Change 21-0001
May 14, 2024
Exhibit A
Existing Zoning Map Proposed Zoning Map

ATTACHMENT 3
RESOLUTION 2024-27

A RESOLUTION OF THE CITY COUNCIL OF THE CITY OF SAN DIMAS, COUNTY OF LOS ANGELES, APPROVING LOT MERGER 21-0001,
DEVELOPMENT PLAN REVIEW BOARD CASE NUMBER 21-0002, AND TREE REMOVAL PERMIT NUMBER 21-0004 FOR THE DEVELOPMENT OF A 63,749

SQUARE-FOOT CONCRETE TILT-UP WAREHOUSE/OFFICE MULTI-TENANT BUILDING FOR THE PROPERTIES LOCATED AT 309 W. ALLEN AVENUE, 917 N. CATARACT AVENUE, AND 929 N. CATARACT AVENUE (APN’S: 8392-016- 008, -048, 047).

WHEREAS, an application was filed by:

Ignacio Crespo
OC Design & Engineering
7901 Crossway Drive
Pico Rivera, CA 90660
WHEREAS, the Applicant, Ignacio Crespo, submitted the following Project applications Lot Merger 21-0001, DPRB 21-0002, and TRP 21-0004 to merge three (3) contiguous lots together for the development of a 63,749 square-foot concrete tilt-up warehouse/office multitenant building, and remove 17 mature trees in conjunction with the project; and WHEREAS, the Project applies to the following described real properties:
309 W. ALLEN AVENUE, APN 8392-016-008
917 N. CATARACT AVENUE, APN 8392-016-048
929 N. CATARACT AVENUE, APN 8392-016-047
WHEREAS, On March 23, 2023, the Development Plan Review Board, at a regularly held and noticed meeting, heard evidence and recommended approval of Development Plan Review Board 21-0002 and Tree Removal Permit 21-0004 to the Planning Commission; and WHEREAS, On May 4, 2023, the Planning Commission, at a regularly scheduled and noticed meeting, heard evidence and recommended approval to the City Council of Lot Merger 21-0001, Development Plan Review Board 21-0002 and Tree Removal Permit 21-0004; and WHEREAS, the City Council has received the report and recommendation of such agencies as have submitted information including the written report and recommendation of Staff; and
WHEREAS, notice was duly given of the City Council public hearing on the matter and that public hearing was held on May 14, 2024, at the hour of 7:00 p.m., with all testimony received being made a part of the public record; and
WHEREAS, the application is a project pursuant to the California Environmental Quality Act (Public Resources Code Section 21000 et seq.) ("CEQA") and an initial study was prepared to determine possible environmental impacts. On the basis of the initial study, which indicated that all potential environmental impacts from the Project were less than significant or could be mitigated to a level of insignificance, a Mitigated Negative Declaration was prepared pursuant to CEQA Guidelines; and

Resolution 2024-27 Page 2
DPRB 21-002, Tree Removal Permit 21-0004 and Lot Merger 21-0001 May 14, 2024
WHEREAS, a Draft Mitigated Negative Declaration was prepared in accordance with CEQA Guidelines to evaluate the physical environmental impacts of the Proposed Project. The Mitigated Negative Declaration was circulated for a 20-day public review on March 7, through March 27, 2023 and was also made available for review on the City’s website at www.sandimasca.gov. A complete copy of the Mitigated Negative Declaration is on file and can be viewed in the Planning Division at 245 E. Bonita Avenue, San Dimas, California; and NOW, THEREFORE, in consideration of the evidence received at the hearing, and for the reasons discussed by the City Council at the hearing, and subject to the Conditions attached as “Exhibit A”, the City Council now finds as follows:

Development Plan Review Findings
A. The development of the site in accordance with the development plan is suitable for the use or development intended.

The proposed development consists of a 63,749 square-foot concrete tilt-up warehouse/office multi-tenant building, which will require a zone change, lot merger, removal of 17 mature trees, and approval of a development plan for site plan layout and architectural review of the new warehouse building. The proposed building will be located at the southeast corner of the site, and a new drive aisle with parking will wrap around the building along the west and north property lines and will be accessed from Allen Avenue and Cataract Street. A truck loading dock will be located along the west elevation of the building and will service both proposed units within the new warehouse building, and a trash enclosure will also be constructed adjacent to the drive aisle along the west property line. The building will have varying heights, including tower-like elements at various locations to break up the massing, and will have a total height of 41 feet. The design of the building incorporates various architectural elements to help break up the building mass and elevations. New landscaping, including replacement trees will be installed throughout the site. Therefore, the proposed project will be constructed in a manner that will be compatible with adjacent light manufacturing buildings, in compliance with the development standards of the proposed M-1 zone, subject to the conditions of approval.

B. The total development is so arranged as to avoid traffic congestion, ensure the public health, safety and general welfare, prevent adverse effects on neighboring property.

The subject site is located within an established light manufacturing and warehousing corridor with similar developments. The building design is comparable to other existing light manufacturing buildings located within the same area along Allen Avenue. Therefore, the proposed concrete tilt-up warehouse/office building is not out of character with the existing neighborhood. The project requires a total of 54 parking spaces and four (4) motorcycle spaces, and the project is proposing 56 parking spaces and four (4) motorcycle spaces in compliance with the Code requirement. The project will be accessed via two (2) driveways located on Allen Avenue and Cataract Avenue. In an effort to reduce impacts to Allen Avenue, Condition of approval No. 69 has been included to require that truck ingress be limited to the Cataract Avenue driveway and that the Applicant also install signing and striping improvements to prevent truck ingress from Allen Avenue. A Mitigation Monitoring and Reporting Program will also be carried out throughout the duration of the project’s construction to ensure that environmental impacts associated with the project are mitigated to less than significant in accordance with CEQA Guidelines. Therefore, the

Resolution 2024-27 Page 3
DPRB 21-002, Tree Removal Permit 21-0004 and Lot Merger 21-0001 May 14, 2024
project will comply with the development standards of the proposed M-1 zone to the extent physically possible and the Applicant’s use of high-quality materials for the new building design will be done in a manner to ensure public health, general welfare, and prevent adverse effects on the neighboring properties.

C. The development is consistent with all elements of the general plan and is in compliance with all applicable provisions of the zoning code and other ordinances and regulations of the city.

As part of the project and in compliance with Government Code Section 65860 the subject site will be rezoned from Light Agriculture (AL) to Light Manufacturing (M-1), which will provide consistency with the General Plan land use designation of Industrial. Therefore, the proposed project meets the intent of the General Plan land use designation of Industrial and will comply with all zoning standards of the proposed M-1 zone, including setbacks, height, etc. The proposed site improvements in conjunction with the development will enhance the existing streets and and will be consistent with all of the elements of the General Plan, M-1 zone, and all other ordinances and regulations of the City, to the extent physically possible.

Tree Removal Findings
D. It is reasonable to remove the trees because the continued existence at the location prevents the reasonable development of the subject property.

The 17 trees proposed for removal would prevent the reasonable development of the subject property. The trees to be removed are located within or adjacent to the proposed building pad location, and within the proposed drive aisle which warrants their removal.

As required by the City’s Tree Preservation ordinance, the Applicant will be required to plant 34 replacement trees. The conceptual landscape plan includes a total of 40 replacement trees, which will include the 34 required replacement tree.

NOW, THEREFORE, BE IT FURTHER RESOLVED, PURSUANT TO THE ABOVE FINDINGS, that the City Council approves Lot Merger 21-0001, Development Plan Review Board 21-0002 and Tree Removal Permit 21-0004 subject to compliance with the Conditions in “Exhibit A” attached hereto and incorporated herein.

PASSED, APPROVED AND ADOPTED this 14th day of May, 2024. ____________________________________
Emmett G. Badar, Mayor
ATTEST:
_______________________________
Debra Black, City Clerk

Resolution 2024-27 Page 4
DPRB 21-002, Tree Removal Permit 21-0004 and Lot Merger 21-0001 May 14, 2024
I, Debra Black, City Clerk, hereby certify that Resolution 2024-27 was adopted by the City Council of San Dimas at its regular meeting of May 14, 2024 by the following vote:

AYES:

NOES:

ABSENT:

ABSTAIN:
_____________________________
Debra Black, City Clerk

Resolution 2024-27 Page 5
DPRB 21-002, Tree Removal Permit 21-0004 and Lot Merger 21-0001 May 14, 2024

EXHIBIT A

CONDITIONS OF APPROVAL
for
ZC 21-0001, LM 21-0001, DPRB 21-0002, AND TRP 21-0004
Associated Case No. ACCELA PROJ-21-0006
A request for a Zone Change from Light Agriculture to Light Manufacturing, a Lot Merger to consolidate 3 lots, a Tree Removal Permit to remove 17 mature trees, and a development of a new 63,749 square-foot concrete tilt-up warehouse/office multi-tenant building located at 309 W.

Allen Avenue, 917 N. Cataract Avenue, and 929 N. Cataract Avenue (APN 8392-016-008, -048, and -047).

PLANNING DIVISION - (909) 394-6250

1. The Applicant/Developer agrees as a condition of approval of the Project, to defend, at the sole expense of the Applicant/Developer, any action brought against the City and the City Parties based upon or in any way connected to the approval of the Project, including but not limited to the accompanying CEQA environmental review and approvals, any fees related to the Project, and/or AB 1218/ Government Code Section 66300.6 replacement housing requirements and compliance. The Applicant/Developer shall reimburse the City for any costs and attorney's fees that the City and City Parties may be required to pay as a result of any such action, including those of an opposing party required to be paid by the City pursuant to any judgment, court order, or settlement and those incurred directly by the City in its own defense. The City will select the attorney or firm of its choosing to represent the City and City Parties in any such action. The City may, as its sole discretion, participate in the defense of such action, and such participation shall not relieve the Applicant/Developer of the above obligations.

2. The Applicant/Developer shall be responsible for any City Attorney costs incurred by the City for the project, including, but not limited to, consultations, and the preparation and/or review of legal documents. The applicant shall deposit funds with the City to cover these costs in an amount to be determined by the City.

3. Copies of the signed DPRB Conditions of Approval shall be included on the plans (full size).

The sheet(s) are for information only to all parties involved in the construction/grading activities and are not required to be wet sealed/stamped by a licensed Engineer/Architect.

4. The Applicant/Developer shall comply with all requirements of the (M-1) Light Manufacturing Zone.

5. All Conditions are final unless appealed to the City Council within 14 days of the issuance of the Conditions in accordance with the provisions of Chapter 18.212 of the San Dimas Zoning Code.

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DPRB 21-002, Tree Removal Permit 21-0004 and Lot Merger 21-0001 May 14, 2024

6. The building permits for this project must be issued within one year from the date of approval or the approval will become invalid. A time extension may be granted under the provisions set forth in Chapter 18.12.070 F.

7. The Applicant/Developer shall sign an affidavit accepting all Conditions and all Standard Conditions before issuance of building permits.

8. The Applicant/Developer shall comply with all City of San Dimas Business License requirements and shall provide a list of all contractors and subcontractors that are subject to business license requirements.

9. The Applicant/Developer shall comply with all Conditions of Approval as approved by the Development Plan Review Board on March 23, 2023 and the City Council on May 14, 2024.

10. The entire site shall be kept free from trash and debris at all times and in no event shall trash and debris remain for more than 24 hours during construction.

11. During grading and construction phases, the construction manager shall serve as the contact person in the event that dust or noise levels become disruptive to local residents. A sign shall be posted at the project site with the contact phone number.

12. The Project is subject to AB 1218/ Government Code Section 66300.6, which in part requires that the City “not approve a development project that will require the demolition of occupied or vacant protected units, or that is located on a site where protected units were demolished in the previous five years” unless specified requirements are satisfied. Accordingly, the requirements of AB 1218 / Government Code Section 66300.6 are incorporated by reference into these conditions of approval and the Applicant shall ensure that all applicable AB 1218 / Government Code Section 66300.6 replacement housing requirements are met following the City’s approval of the Project. For purposes of compliance with Government Code Section 66300.6(b)(2)(B), the required replacement housing shall be “developed prior to or concurrently with” the Project. All AB1218 / Government Code Section 66300.6 requirements must be met prior to final inspection or issuance of a certificate of occupancy for the Project.

The Applicant/Developer shall indemnify, defend, and hold harmless, the City and all of its officers, employees and agents (“City Parties”) against all claims, demands and causes of action arising out of or in connection with the Project, improvements constructed with the Project, or the Projects approvals including the environmental review and approvals and AB 1218/ Government Code Section 66300.6 replacement housing requirements and compliance.

DESIGN

13. Building architecture and site plan shall be consistent with plans presented to the Development Plan Review Board on March 23, 2023 and to the City Council on May 14, 2024, provided that the Director of Community Development is authorized to make revisions consistent with the San Dimas Municipal Code.

14. Plans for all exterior design features, including, but not limited to, doors, windows, mailboxes and architectural treatments, shall be submitted to the Planning Division for review and approval before issuance of building permits.

Resolution 2024-27 Page 7
DPRB 21-002, Tree Removal Permit 21-0004 and Lot Merger 21-0001 May 14, 2024

15. The lighting fixture design shall compliment the architectural program. Location and type of exterior lighting fixtures shall be submitted by the developer to the Planning Division for review and approval prior to installation.

16. Gas meters, backflow prevention devices and other ground-mounted mechanical or electrical equipment installed by the Applicant/Developer shall be inconspicuously Iocated and screened, as approved by the Director of Community Development. Location of this equipment shall be clearly noted on landscape construction documents.

17. All exterior building colors shall match the color and material board on file with the Planning Division. Any revision to the approved building colors shall be submitted to the Planning Division for review and approval.

18. The Applicant/Developer shall ensure that all doors exiting to the drive-aisle/fire lane comply with all applicable codes.

19. The Applicant/Developer shall install decorative, recessed-lighting or ground-mounted uplighting on the recessed alcoves on the South and East elevations. Lighting fixture design shall be submitted to the Planning Division for review and approval.

20. All future tenants’ business operations, including but not limited to truck deliveries and hours of operation shall comply with the City’s noise ordinance.

LANDSCAPE

21. The Applicant/Developer shall submit to the Planning Division, prior to the issuance of building permits, detailed landscaping and automatic irrigation plans prepared by a State registered Landscape Architect, in addition to a $2,500 deposit for review of the plans.

Installation of new landscape is subject to the Model Water Efficient Landscape Ordinance (MWELO). Water efficient landscapes shall be implemented in all new and rehabilitated landscaping in single-family and multi-family projects, and in private development projects that require a grading permit, building permit or use permit, as required by Chapter 18.14 of the San Dimas Municipal Code.

22. All landscaping and automatic irrigation shall be installed and functional prior to occupancy of the building(s), in accordance with the plans approved by the Planning Division.

23. The Applicant/Developer shall show all proposed transformers on the landscape plan. All transformers shall be screened with landscape treatment such as trellis work or block walls with climbing vines or City approved substitute.

TREE REMOVAL PERMIT 21-0004

24. The approval of the Development Plan Review Board is for the removal of 17 mature trees to be replaced with 34 replacement trees a minimum size of 24-inch box. The replacement trees shall be identified on the landscape plan.

25. All replacement trees shall have a minimum height of eight (8) feet measured from finished grade to the top of the canopy, and a minimum canopy width of three (3) feet.

Resolution 2024-27 Page 8
DPRB 21-002, Tree Removal Permit 21-0004 and Lot Merger 21-0001 May 14, 2024

26. The Owner/Applicant shall request an inspection by Staff to demonstrate that all trees have been planted and all conditions of approval related to the tree installation/plantings have been met.

27. Arborists or tree removal companies and any contractors or subcontractors shall have a valid City business license prior to performing any work in the City.

28. All other trees not identified for removal shall be preserved in-place and/or pruned in accordance with San Dimas Municipal Code Section 18.162.100 and proper arboricultural practices. The two mature trees not proposed for removal shall be protected in place during construction. If the tree are damaged or removed, replacement trees may be required.

29. The Owner/Applicant shall comply with all requirements of the City’s Tree Preservation Ordinance.

30. All conditions are final unless appealed to the City Council within 14 days of the issuance of the Conditions in accordance with the provisions of Chapter 18.212 of the San Dimas Zoning Code.

BUILDING DIVISION – (909) 394-6260

31. The plans shall be prepared in compliance with the latest adopted edition of the codes as adopted by reference by the City of San Dimas: California Green Building Standards Code, California Building Code, California Mechanical Code, California Plumbing Code, and California Electrical Code.

32. The Applicant/Developer shall comply with the latest California Title 24 Energy requirements for all new lighting, insulation, and mechanical equipment and submit calculations at time of initial plan review.

33. The Applicant/Developer shall submit to the Building Division of the City of San Dimas plans to be forwarded for review by the Los Angeles County Fire Department. Plans may include access, fire sprinklers, mechanical ventilation, and any other applicable items regulated under the Fire Code.

34. The Applicant/Developer shall comply with the latest disabled access regulations as found in Title 24 of the California Code of Regulations and the Americans with Disabilities Act.

Accessible items shall include, but not be limited to parking, accessible pedestrian routes, public/common use areas, etc.

35. All plans are required to be stamped by a California Registered Engineer or Architect unless specifically exempted by Sections 5537-5538 of the California Business & Professions Code.

36. Construction calculations, including lateral analysis, shall be required at the time plans are submitted for plan check.

37. Mechanical, Electrical and Plumbing plans are required to be submitted at time of initial plan submittal. Electrical schematic and load list and plumbing (drainage, water, gas) schematics will be required before issuance of electrical or plumbing permits.

Resolution 2024-27 Page 9
DPRB 21-002, Tree Removal Permit 21-0004 and Lot Merger 21-0001 May 14, 2024

38. The Applicant/Developer shall submit a Rough Grading Plan for the proposed development to be reviewed and approved by the City Engineer and the Director of Development Services.

The Grading Plan shall conform to Appendix J of the California Building Code and shall utilize City standard notes and layout.

39. Building foundation inspections shall not be performed until a rough grading certification, survey stakes in place, and a final soils report has been filed with the City and approved. All drainage facilities must be operable.

40. Prior to the inspection of the foundation, the Applicant/Developer shall submit a footing bottom compaction certification by a licensed soils tech.

41. Fees shall be paid to Bonita School District in compliance with Government Code Section 65995.

42. The Applicant/Developer shall contact the Los Angeles County Public Works Department, Environmental Program Division for any required permit or clearance of industrial and hazardous waste disposal.

43. The Applicant/Developer shall contact the Los Angeles County Sanitation District for potential fees associated with annexation, connection, or change of occupancy.

44. Prior to removing any existing structures on the property, the Applicant/Developer shall obtain clearance from SCAQMD and obtain a Demolition Permit from the Building & Safety Division.

45. The Applicant/Developer shall submit an Electrical Distribution Plan for all proposed switchgear or transformers to the City for review as soon as possible.

46. Construction hours shall be limited to between 7:00 a.m. and 8:00 p.m., and shall be prohibited at any time on Sundays or public holidays, per San Dimas Municipal Code Section 8.36.100.

47. Phased occupancy shall not be granted until all improvements required as part of the approval have been completed in full for each phase, and approved or finalized by the appropriate department. A phasing plan shall be submitted for approval by the Director of Development Services prior to issuance of building permits.

ENGINEERING DIVISION – (909) 394-6240

48. Prior to the start of construction, a minimum five-foot (5’) high fence composed of chain link or other approved material including a dark green or black view obscuring screen, shall totally enclose the perimeter of the development when vacant, under construction, or under demolition, and said fence shall remain until occupancy is granted.

49. Trash/Recycling enclosure(s) shall be constructed by the Applicant/Developer per City of San Dimas standard plan and shown on the construction plans. The exact location of the trash/recycling enclosure(s) shall be approved by the Planning Division and the Trash Company.

50. The Applicant/Developer shall underground all new utilities, and utility drops, and shall underground all existing overhead utilities to the closest power pole outside of property lines on Allen Avenue and Cataract Avenue.

Resolution 2024-27 Page 10
DPRB 21-002, Tree Removal Permit 21-0004 and Lot Merger 21-0001 May 14, 2024

51. The Applicant/Developer shall submit a Precise Grading Plan for the proposed development to be reviewed and approved by the City Engineer and the Director of Development Services.

Plans shall include utility locations, paving and striping plan.

52. Prior to the issuance of any grading or building permits, the Applicant/Developer shall submit an updated Engineering Geology/Soils Report that includes an accurate description of the geology of the site and conclusions and recommendations regarding the effect of the geologic conditions on the proposed development and include a discussion of the expansiveness of the soils and recommended measures for foundations and slabs on grade to resist volumetric changes of the soil. This report shall also include recommendations for surcharge setback requirements in the area of ungraded slopes steeper than five horizontal to one vertical.

53. The Applicant/Developer shall provide a signed copy of the City’s certification statement declaring that the contractor will comply with Minimum Best Management Practices (BMPs) required by the MS4 permit for Los Angeles County as mandated by the National Pollutant Discharge Elimination System (NPDES).

54. The Applicant/Developer shall install sanitary sewers to serve the entire development to the specifications of the City Engineer and Los Angeles County Sewer Maintenance.

55. The Applicant/Developer shall Contact the Los Angeles County Sanitation District for any required annexation, extension, or sewer trunk fee. Proof of payment/clearance is required before the City will issue any sewer permit.

56. The Applicant/Developer shall provide drainage improvements to carry runoff of storm waters in the area proposed to be developed, and for contributory drainage from adjoining properties to be reviewed and approved by the City Engineer. The Applicant/Developer shall make a good faith effort to negotiate with the downstream property owner for all required downstream storm drain improvements. The proposed drainage improvements shall be based on a detailed Hydrology Study conforming to the current Los Angeles County methodology. The developed flows outletting into the existing downstream system(s) from this project cannot exceed the pre-existing storm flows.

57. The Applicant/Developer shall provide full street improvements on all streets within the limits of the development. Improvements to include curbs and gutters, sidewalks, and paving according to City standards, as shown in the following table:

Street Name
Curb & Gutter
A.C.

Pavement
Side-walk
Drive
Approach
Street Lights
Street Trees
Multi-use
Trail
Median Island
Bike Trail
Other
Cataract Avenue X X X X X X
Allen Avenue X X X X
Notes: Cold plane and AC overlay from edge of gutter to centerline on Allen Avenue

Resolution 2024-27 Page 11
DPRB 21-002, Tree Removal Permit 21-0004 and Lot Merger 21-0001 May 14, 2024
Reconstruct pavement section from edge of gutter to
centerline on Cataract Avenue
Remove all existing driveways and replace with curb & gutter and sidewalk
Upgrade curb ramp and cross gutter
Install sidewalk on Cataract Avenue

58. The Applicant/Developer shall install water and fire line improvements to the satisfaction of the City Engineer and Los Angeles County Fire Department.

59. Due to construction, the Applicant/Developer shall be responsible for any repairs within the limits of the development, including but not limited to streets and paving, curbs and gutters, sidewalks, and street lights as determined by the City Engineer and Public Works Director.

60. The Applicant/Developer shall obtain a Public Works permit for all work within or adjacent to the public right-of-way and shall be subject to review and approval of the Public Works Director and the work shall be in accordance with applicable standards of the City of San Dimas; i.e.

Standard Specifications for Public Works Construction (Green Book) and the California Manual of Uniform Traffic Control Devices (CA MUTCD), and further that the construction equipment ingress and egress be controlled by a plan approved by Public Works.

61. For projects that disturb one (1) acre or greater of soil, or projects that disturb less than one acre but are part of a larger common plan of development that in total disturbs one or more acres, the project must obtain coverage under the General Permit for Discharges of Storm Water Associated with Construction Activity, Construction General Permit Order 2012-0006- DWQ (as amended by all future adopted Construction General Permits). The Construction General Permit requires the development and implementation of a Storm Water Pollution Prevention Plan (SWPPP). Developer must submit a Notice of Intent and Waste Discharger’s Identification (WDID) number as evidence of having applied with the Construction General Permit before the City will issue a grading permit. The project proponent is ultimately responsible to comply with the requirements of Order No. 2012-0006-DWQ, however, the City shall have the authority to enter the project site, review the project SWPPP, and require modifications and subsequent implementations to the SWPPP in order to prevent polluted runoff from leaving the project site onto public or private property.

62. For all projects subject to Low Impact Development (LID) regulations, Applicant/Developer must submit a site-specific drainage concept and stormwater quality plan to implement LID design principles.

63. A fully executed “Maintenance Covenant for LID Requirements” shall be recorded with the L.A. County Registrar/Recorder and submitted to the Public Works Department prior to the Certificate of Occupancy. Covenant documents shall be required to include an exhibit that details the installed treatment control devices as well as any site design or source control Best Management Practices (BMPs) for post construction. The information to be provided on this exhibit shall include, but not be limited to:
i. 8 ½” x 11” exhibits with record property owner information. ii. Types of BMPs (i.e., site design, source control and/or treatment control) to ensure modifications to the site are not conducted without the property owner being aware of the ramifications to BMP implementation.

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DPRB 21-002, Tree Removal Permit 21-0004 and Lot Merger 21-0001 May 14, 2024
iii. Clear depiction of location of BMPs, especially those located below ground. iv. A matrix depicting the types of BMPs, frequency of inspection, type of maintenance required, and if proprietary BMPs, the company information to perform the necessary maintenance.
v. Calculations to support the sizing of the BMPs employed on the project shall be included in the report. These calculations shall correlate directly with the minimum treatment requirements of the current MS4 permit. In the case of implementing infiltration BMPs, a percolation test of the affected soil shall be performed and submitted for review by the City Engineer.
vi. This document shall be reviewed by and concurred with Public Works to ensure the covenant complies with the MS4 Permit.

64. All site, grading, landscape & irrigation, and street improvement plans shall be coordinated for consistency prior to the issuance of any permits.

65. Construction parking and material storage shall be confined to the site. Construction related parking or material storage is not permitted on the surrounding streets. Street parking of construction vehicles may be permitted with the approval of the Director of Development Services on a limited basis depending on the confinements of the subject site relating to onsite parking.

66. A Lot Merger prepared by or under the direction of a Registered Civil Engineer or Licensed Land Surveyor must be processed through the City Engineer prior to being filed with the County Recorder.

67. The Applicant/Developer shall provide street lights to City and Southern California Edison standards within the limits of the development to the satisfaction of the City Engineer. Street Light locations shall be supported by a lighting photometric analysis.

68. The Applicant/Developer shall construct sidewalk on Cataract Avenue within the limits of the development. All existing driveways within the limits of the development shall be removed and replaced with curb & gutter and sidewalk. Any damaged sections shall be removed and replaced. All work to comply with city standards to the satisfaction of the City Engineer.

69. The Applicant/Developer shall reconstruct the existing curb ramp at the northwest corner of Allen Avenue and Cataract Avenue to current ADA standards and to the satisfaction of the City Engineer.

70. The Applicant/Developer shall reconstruct the existing cross gutter at the intersection of Allen Avenue and Cataract Avenue to City standards and to the satisfaction of the City Engineer.

71. The Applicant/Developer shall cold plane the north side of Allen Avenue from edge of gutter to centerline within the limits of development to a depth of 0.20’ and install an AC overlay to the satisfaction of the City Engineer.

72. The Applicant/Developer shall reconstruct the existing pavement section on the west half of Cataract Avenue from edge of gutter to centerline within the limits of the development to the satisfaction of the City Engineer.

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73. Truck ingress shall be limited to the Cataract Avenue driveway. The Applicant/Developer shall install signing and striping improvements to prevent truck ingress from Allen Avenue to the satisfaction of the City Engineer.

74. The Applicant/Developer shall treat stormwater from the loading bay prior to discharge.

Treatment method shall be shown on submitted grading plans and approved by the City Engineer.

75. The Applicant/Developer shall provide protection for exterior doors that open into the parking area/driving aisle to the satisfaction of the City Engineer.

MITIGATION MEASURES

76. BIOLOGICAL RESOURCES - MM BIO-1: Pre-Construction Breeding Bird Survey. If construction is anticipated to commence during the nesting season (between January 1 and August 31 of any given year, or as determined by a local CDFW office), a qualified avian biologist shall conduct a preconstruction nesting bird survey no earlier than one week prior to construction.

To be in compliance with the MBTA and Fish and Game Code, and to avoid impacts or take of migratory non-game breeding birds, their nests, young, and eggs, the following measures will be implemented. The measures below will help to reduce direct and indirect impacts caused by construction on migratory non-game breeding birds to less than significant levels:
i. Project activities that will remove or disturb potential nest sites, such as open ground, trees, shrubs, grasses, and burrows, during the breeding season would be a potentially significant impact if migratory non-game breeding birds are present. Project activities that will remove or disturb potential nest sites will be scheduled outside the breeding bird season to avoid potential direct impacts on migratory non-game breeding birds protected by the MBTA and Fish and Game Code. The breeding bird nesting season is typically from February 15 through September 15 but can vary slightly from year to year, usually depending on weather conditions. Removing all physical features that could potentially serve as nest sites will also help to prevent birds from nesting within the project site during the breeding season and during construction activities. ii. If project activities cannot be avoided from February 15 through September 15, a qualified biologist will conduct a pre-construction breeding bird survey for breeding birds and active nests or potential nesting sites within the limits of project disturbance. The survey will be conducted at least seven days prior to the onset of scheduled activities, such as mobilization and staging. It will end no more than three days prior to vegetation, substrate, and structure removal and/or disturbance.
iii. If no breeding birds or active nests are observed during the pre-construction survey or they are observed and will not be impacted, project activities may begin and no further mitigation will be required.

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iv. If a breeding bird territory or an active bird nest is located during the pre-construction survey and will potentially be impacted, the site will be mapped on engineering drawings, and a no-activity buffer zone will be marked (fencing, stakes, flagging, orange snow fencing, etc.) a minimum of 100 feet in all directions or 500 feet in all directions for listed bird species and all raptors. The biologist will determine the appropriate buffer size based on the type of activities planned near the nest and the type of bird that created the nest. Some bird species are more tolerant than others of noise and activities occurring near their nest. The buffer zone will not be disturbed by construction or other activity 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. v. If listed bird species are observed within the project site during the pre-construction survey, the biologist will immediately map the area and notify the appropriate resource agency to determine suitable protection measures and/or mitigation measures and to determine if additional surveys or focused protocol surveys are necessary. Project activities may begin within the area only when concurrence is received from the appropriate resource agency.
vi. 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.

77. BIOLOGICAL RESOURCES - MM BIO-2: Mature Significant Tree Replacement Measure.

There are 19 trees on the project site that are designated as mature significant trees as per the City’s tree preservation ordinance (City of San Dimas, 2006), 17 of which are proposed for removal. The following species and number per species of mature significant trees are proposed for removal: one bishop pine, eleven pepper trees, three white ash, one Mexican fan palm, and one carrotwood. Section 18.162.060 Conditions Imposed of the tree preservation ordinance state that mature significant trees must be replaced using a two-toone ratio with trees that are 15-gallon box trees, or other replacement of equivalent value and size, or as the City deems appropriate. It further states that the replacement trees will be planted within the project site unless the City approves offsite planting. Thus, to replace the 17 mature significant trees that will be removed during the construction of the project, the project proponent will plant 34 fifteen-gallon box trees on the project site. All replacement trees need to be maintained by the project proponent for two years and all other monitoring and maintenance requirements of this section of the tree preservation ordinance must be followed. Furthermore, granting of the tree removal permit is contingent upon meeting the conditions of Section 18.162. 070 Required Findings, of the tree preservation ordinance.

78. CULTURAL RESOURCES - 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 potential for sensitive archaeological and paleontological resources to be unearthed 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

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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 on the area’s environmental conditions and the environmental protection measures that must be adhered to by all workers throughout the duration of 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 attend 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 is added to the project later, the construction foreman shall ensure that new personnel receives training before they start working. The archaeologist shall provide hard copies of the WEAP presentation to the construction foreman.

79. CULTURAL RESOURCES - MM CUL-2: 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 time to recover, analyze, and curate the find(s). 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 afford the necessary time and funds to recover, analyze, and curate the find(s). Construction activities may continue on other parts of the site while the evaluation and treatment of historical or unique archaeological resources take place.

80. CULTURAL RESOURCES - 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 San Bernardino County Coroner will be notified (§ 5097.98 of the Public Resources Code). The Coroner will determine whether the remains are of 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 will contact the Native American Heritage Commission (NAHC). The NAHC will be responsible for designating the Most Likely Descendant (MLD). The MLD (either an individual or sometimes a committee) will be responsible for the ultimate disposition of the remains, as required by § 7050.5 of the California Health and Safety Code. The MLD will 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).

81. GEOLOGY AND SOILS - MM GEO-1: The project applicant shall retain a qualified paleontologist, prior to the issuance of building/grading permit, to remain on-call during project ground-disturbing activities. If paleontological resources are uncovered during project construction, the contractor shall halt construction activities within 50 feet of the find 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). The paleontologist shall curate the find(s) at an accredited repository for paleontological resources such as the Western Science Center near Hemet or the San Bernardino County Museum. Subsequently, the monitor shall remain onsite for the duration of the ground disturbance to ensure the protection of any other resources that are found during construction on the project site.

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82. HAZARDOUS AND HAZARDOUS MATERIALS - MM HAZ-1: In the event that the future tenant will handle hazardous materials above the reportable quantity threshold, the lease agreement with the future tenant shall require the tenant to submit a Hazardous Materials Business Plan which would include an inventory of all hazardous materials used, stored, or otherwise managed onsite to the Los Angeles County Fire Department – Health Hazardous Materials Division. The recommendations of the Hazardous Materials Business Plan would be included in the lease agreement (signed by the tenant) as mandatory measures required to be implemented by the tenant.

83. HAZARDOUS AND HAZARDOUS MATERIALS - MM HAZ-2: In the event that the future tenant will handle hazardous materials above the reportable quantity threshold, the lease agreement with the future tenant shall require the tenant, in coordination with the City of San Dimas, to identify routes along which hazardous materials may routinely be transported. If essential facilities such as schools, hospitals, child care centers, or other facilities with special evacuation needs are located along these routes, the future tenant shall develop an emergency response plan that can be implemented in the event of an unauthorized release of hazardous materials. The recommendations of the Emergency Response Plan would be included in the lease agreement (signed by the future tenant) as mandatory measures required to be implemented by the future tenant.

84. NOISE - MM N-1: The construction contractor will use the following source controls when working within 600 feet of occupied residential buildings:
i. Use of noise-producing equipment will be limited to the interval from 7:00 a.m. to 6:00 p.m. on weekdays, 8:00 a.m. to 5:00 p.m. on Saturdays, with no construction on Sundays.
ii. For all noise-producing equipment, use types and models that have the lowest horsepower and the lowest noise generating potential practical for their intended use.
iii. The construction contractor will ensure that all construction equipment, fixed or mobile, is properly operating (tuned-up) and lubricated, and that mufflers are working adequately.
iv. Have only necessary equipment onsite.
v. Use manually-adjustable or ambient-sensitive backup alarms.

85. NOISE - MM N-2: When working near adjacent residential uses, the construction contractor will also use the following path controls, except where not physically feasible, when needed:
i. Install portable noise barriers, including solid structures and noise blankets, between the active noise sources and the nearest noise receivers. ii. Temporarily enclose localized and stationary noise sources. iii. Store and maintain equipment, building materials, and waste materials as far as practical from as many sensitive receivers as practical.

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86. TRIBAL CULTURAL RESOURCES - MM TCR-1: Retain a Native American Monitor Prior to Commencement of Ground-Disturbing Activities:
i. The project applicant/lead agency shall retain a Native American Monitor from or approved by the Gabrieleño Band of Mission Indians – Kizh Nation. The monitor shall be retained prior to the commencement of any “ground-disturbing activity” for the subject project at all project locations (i.e., both on-site and any off-site locations that are included in the project description/definition and/or required in connection with the project, such as public improvement work). “Ground-disturbing activity” shall include, but is not limited to, demolition, pavement removal, potholing, auguring, grubbing, tree removal, boring, grading, excavation, drilling, and trenching into native soil and undocumented soils. The monitor(s) will continue their duties until it is determined through consultation with the permittee, City Planning, that monitoring is no longer warranted.
ii. A copy of the executed monitoring agreement shall be submitted to the lead agency prior to the earlier commencement of any ground-disturbing activity, or the issuance of any permit necessary to commence a ground-disturbing activity. iii. The monitor will complete daily monitoring logs that will provide descriptions of the relevant ground-disturbing activities, the type of construction activities performed, locations of ground-disturbing activities, soil types, cultural-related materials, and any other facts, conditions, materials, or discoveries of significance to the Tribe.

Monitor logs will identify and describe any discovered TCRs, including but not limited to, Native American cultural and historical artifacts, remains, places of significance, etc., (collectively, tribal cultural resources, or “TCR”), as well as any discovered Native American (ancestral) human remains and burial goods. Copies of monitor logs will be provided to the project applicant/lead agency upon written request to the Tribe.
iv. On-site tribal monitoring shall conclude upon the latter of the following (1) written confirmation to the Kizh from a designated point of contact for the project applicant/lead agency that all ground-disturbing activities and phases that may involve ground-disturbing activities on the project site or in connection with the project are complete; or (2) a determination and written notification by the Kizh to the project applicant/lead agency that no future, planned construction activity and/or development/construction phase at the project site possesses the potential to impact Kizh TCRs.
v. Upon discovery of any TCRs, all construction activities in the immediate vicinity of the discovery shall cease (i.e., not less than the surrounding 50 feet) and the City notified. Construction activities may continue in other areas outside of the designated protection zone, which shall be delineated with cones, flagging, or fencing. The designated Kizh monitor and/or Kizh archaeologist shall evaluate the significance of the find and determine whether the resource uncovered is a TCR.

If its determined that the potential resource is a TCR (as defined by PRC, Section 21074), tribes consulting under AB 52 would be provided a reasonable period of time, typically 5 days from the date of a new discovery is made, to conduct a site visit and make recommendations regarding future ground disturbance activities as well as the treatment of any discovered TCRs. The designated tribe