Desert Hot Springs City Council
January 18, 2022

City of Desert Hot Springs
Date: October 2021
Project Name: Rancho Descanso Specific Plan, TTM 38200, Dev Permit 21-18

Sources: “Final Environmental Impact Report: Desert Hot Springs General Plan Update and Zoning Amendment.” Desert Hot Springs, May 1, 2020; Desert Hot Springs Climate Action Plan. Adopted 2013; “Interim CEQA GHG Significance Threshold for Stationary Sources, Rules and Plans,” SCAQMD, December 5, 2008. CalEEMod Version 2020.4.0.

Setting
Certain gases in the earth’s atmosphere, classified as greenhouse gases (GHGs), play a critical role in determining the earth’s surface temperature. Prominent GHGs contributing to the greenhouse effect are CO2, methane (CH4), nitrous oxide (N2O), and fluorinated compounds. Sources of GHGs include both natural and anthropogenic (humancaused) processes. Anthropogenic emissions of these GHGs in excess of natural ambient concentrations are responsible for intensifying the greenhouse effect and have led to a trend of unnatural warming of the earth’s climate, known as global climate change or global warming.

State laws such as Assembly Bill 32 (AB 32) and Senate Bill 32 (SB 32) require all cities to reduce greenhouse gas emissions to 1990 levels by the year 2020 and 40 percent below 1990 levels by 2030, respectively.

The City of Desert Hot Springs adopted a Climate Action Plan (CAP) in 2013 that sets forth a series of strategies to achieve greenhouse gas reduction targets. According to the City’s CAP, Desert Hot Spring’s 2010 communitywide emissions baseline is 100,654 metric tons of CO2e (MTCO2e), which is equivalent to 6.6 MTCO2e per year per service population.2 Based on this historical emissions profile, the CAP established its annual Year 2020 GHG emission reduction goal to be 64,047 MTCO2e, which would require an approximately 48,769 MTCO2e decrease from its BAU forecasted scenario for the Year 2020. More recently, and to remain consistent with SB 32, the City’s General Plan Update (GPU) readjusted the GHG efficiency target to 2.6 MTCO2e per year per service population by 2040.3 Therefore, the GPU, including projects consistent with the GPU, would achieve per capita thresholds for the year 2040 as established by SB 32.

GHG Thresholds4
On December 5, 2008, the SCAQMD formally adopted a greenhouse gas significance threshold of 10,000 MTCO2e/yr that only applies to industrial uses’ stationary sources where SCAQMD is the lead agency (SCAQMD Resolution No. 08-35). This threshold was adopted based upon an October 2008 staff report and draft interim guidance document that also recommended a threshold for all projects using a tiered approach.

It was recommended by SCAQMD staff that a project’s greenhouse gas emissions would be considered significant if it could not comply with at least one of the following “tiered” tests:
• Tier 1: Is there an applicable exemption?
• Tier 2: Is the project compliant with a greenhouse gas reduction plan that is, at a minimum, consistent with the goals of AB 32?
• Tier 3: Is the project below an absolute threshold (10,000 MTCO2e/year for industrial projects; 3,000 MTCO2e/year for residential and commercial projects)?
• Tier 4: Is the project below a (yet to be set) performance threshold? • Tier 5: Would the project achieve a screening level with off-site mitigation? 2 Final Environmental Impact Report: Desert Hot Springs General Plan Update and Zoning Amendment. May 1, 2020. 3 Ibid. 4 “Interim CEQA GHG Significance Threshold for Stationary Sources, Rules and Plans,” SCAQMD, December 5, 2008.

VIII. GREENHOUSE GAS EMMISSIONS
Would the project:

Potentially
Significant
Impact
Less Than
Significant
with
Mitigation
Incorporated
Less Than
Significant
Impact
No
Impact
a) Generate greenhouse gas emissions either
directly or indirectly, that may have a significant
impact on the environment?
b) Conflict with an applicable plan, policy or
regulation adopted for the purpose of reducing
the emissions of greenhouse gases?
Item Number: 4.

City of Desert Hot Springs
Date: October 2021
Project Name: Rancho Descanso Specific Plan, TTM 38200, Dev Permit 21-18

Discussion of Impacts
a) Less Than Significant Impact. The Proposed Project will generate GHG emissions during both construction and operation. As described in Section III, Air Quality, above, the California Emissions Estimator Model (CalEEMod) Version 2020.4.0 was used to quantify air quality emission projections, including greenhouse gas emissions (Appendix A).

Construction
Construction activities will result in short-term GHG emissions associated with operation of construction equipment, employee commute, material hauling, and other ground disturbing activities. As shown in Table 4, the project will generate 824 MTCO2e during the 2-year construction period. There are currently no construction-related GHG emission thresholds for projects of this nature. To determine if construction emissions will result in a cumulatively considerable impact, buildout GHG emissions were amortized over a 30-year period and added to annual operational emissions to be compared to applicable GHG thresholds (see Table 5, below).

Operation
At buildout, there are five emission source categories that will be contributing either directly or indirectly to operational GHG emissions, including energy/electricity usage, water usage, solid waste disposal, area emissions (pavement and architectural coating off-gassing), and mobile sources. Table 5 provides a summary of the projected short-term construction and annual operational GHG generation associated with buildout of the Proposed Project.

Table 5
Projected GHG Emissions Summary
(Metric Tons)
Phase CO2e (MT/YR)
Construction
2021 177.90
2022 377.56
2023 268.48
Construction Total 823.94
Operation
Area 2.55
Energy 223.30
Mobile 575.61
Waste 50.51
Water 24.41
Construction: 30-year amortized 1 27.46
Total Operational 903.84
Tier Compliance Tier 3

1. Buildout construction GHG emissions were amortized
over 30-years then added to buildout operational GHG
emissions. 823.94/30 = 27.46
As shown in the table above, the Proposed Project will generate less than 3,000 MTCO2e, consistent with the Tier 3 threshold for residential projects. The Project is also consistent with the GPU and existing Specific Plan, meaning the Project is expected to achieve per capita thresholds for the year 2040 as established by SB 32. Therefore, impacts associated with the generation of greenhouse gases will be less than significant.

Item Number: 4.

City of Desert Hot Springs
Date: October 2021
Project Name: Rancho Descanso Specific Plan, TTM 38200, Dev Permit 21-18

b) Less than Significant. Buildout of the Project will result in emissions that are consistent with the communitywide per capita emissions threshold set forth in the General Plan, as established by AB 32/SB 32. The City’s GPU supports and is consistent with the CARB 2017 Climate Change Scoping Plan and SCAG’s 2020 RTP/SCS. All components of construction and operation, including equipment, fuels, materials, and management practices, would be subject to the CAP, GPU policies, and current SCAQMD rules and regulations related to greenhouse gases, as discussed above. Based on these findings, the Proposed Project will not conflict with an applicable plan, policy or regulation with the purpose of reducing GHG emissions and impacts will be less than significant.

Mitigation Measures:

None required.

Monitoring:

None required.

Item Number: 4.

City of Desert Hot Springs
Date: October 2021
Project Name: Rancho Descanso Specific Plan, TTM 38200, Dev Permit 21-18

IX. HAZARDS AND HAZARDOUS

MATERIALS
Would the project:

Potentially
Significant
Impact
Less Than
Significant
with
Mitigation
Incorporated
Less Than
Significant
Impact
No
Impact
a) Create a significant hazard to the public or
the environment through the routine transport,
use, or disposal of hazardous materials?
b) 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?
c) Emit hazardous emissions or handle
hazardous or acutely hazardous materials,
substances, or waste within one-quarter mile of
an existing or proposed school?
d) Be located on a site which is included on a
list of hazardous materials sites compiled
pursuant to Government Code Section 65962.5
and, as a result, would it create a significant
hazard to the public or the environment?
e) For a project located within 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 result in a
safety hazard or excessive noise for people
residing or working in the project area?
f) Impair implementation of or physically
interfere with an adopted emergency response
plan or emergency evacuation plan?
g) Expose people or structures, either directly
or indirectly, to a significant risk of loss, injury or death involving wildland fires?
Sources: City of Desert Hot Springs General Plan, May 2020; State Water Resources Control Board, https://geotracker.waterboards.ca.gov/map/, accessed on September 1, 2021; California Department of Toxic Substances Control EnviroStor Database, https://www.envirostor.dtsc.ca.gov/public/map/?myaddress=desert+hot+springs, accessed September 21, 2021.

Setting
There are only a few identified hazardous/toxic material generators In the City of Desert Hot Springs and these are associated with commercial, quasi-industrial and medical operations which have the potential to be associated with accidental spills, purposeful illegal dumping, air emissions, and other uncontrolled discharges into the environment.

Currently, there are several potentially hazardous waste users that are generally restricted to the “small quantity generators.” These include medical clinics and facilities, gasoline service stations, equipment and fuel storage yards, and waste haulers. The City of Desert Hot Springs is responsible for coordinating with the appropriate county and state agencies in the identification of hazardous material sites, and the active regulation of their timely cleanup.

Item Number: 4.

City of Desert Hot Springs
Date: October 2021
Project Name: Rancho Descanso Specific Plan, TTM 38200, Dev Permit 21-18

“GeoTracker” is the State Water Resources Control Board’s Internet-accessible database system used by the State Board, regional boards, and local agencies to track and archive compliance data from authorized or unauthorized discharges of waste to land, or unauthorized releases of hazardous substances from underground storage tanks.

The GeoTracker online database provides access to statewide environmental data and tracks regulatory data for the following types of sites:

1. Leaking Underground Storage Tanks (LUST) cleanup sites

2. Cleanup Program Sites (CPS, also known as Site Cleanups [SC] and formerly known as Spills, Leaks, Investigations, and Cleanups [SLIC] sites)

3. Military sites (including Military UST sites, Military Privatized sites, and Military Cleanup sites [formerly known as Department of Defense (DOD) non-UST])

4. Land Disposal sites (Landfills, Surface Impoundments, Waste Piles, Land Treatment Units, Mining Units)

5. Permitted Underground Storage Tank (UST) facilities (Note: Permitted UST information is now being maintained by California Environmental Reporting System (CERS) (http://cers.calepa.ca.gov/); information in GeoTracker related to Permitted USTs is no longer current)

6. Composting Operations

7. Waste Discharge Requirement (WDR) sites

8. Confined Animal / Concentrated Animal Feed Lots facilities

9. Irrigated Lands Regulatory Program (ILRP) sites

10. Oil and Gas Monitoring sites (Aquifer Exemption, Produced Water Ponds, Underground Injection Control, Well Stimulation Projects)
According to GeoTracker, there are no hazardous materials sites within the Project site and vicinity.

EnviroStor is the Department of Toxic Substances Control’s data management system for tracking the department’s cleanup, permitting, enforcement and investigation efforts at hazardous waste facilities and sites with known contamination or sites where there may be reasons to investigate further. According to EnviroStor, there are no hazardous materials sites within the Project site or the vicinity.

Discussion of Impacts
a-b) Less Than Significant Impact. The proposed Project will result in the development of a 76 home gated residential community on 17.83± acres on largely undisturbed desert lands and surrounded primarily by singlefamily development, and on the west by vacant lands designated for future mixed-use commercial development.

Construction of the Project will involve grading and excavation equipment, water and haul trucks, concrete and other delivery vehicles and miscellaneous cars and trucks. A staging area will be identified and equipment storage and maintenance will be within a secured area of the site. Potentially hazardous materials to be used during construction include gasoline and diesels fuels, as we as other petroleum-based lubricates and materials. Postconstruction, potentially hazardous materials are expected to be limited to household, garden and pool chemicals and materials.

In addition, State and federal laws (e.g. the Hazardous Materials Transportation Act, Resource Conservation and Recovery Act, the California Hazardous Material Management Act, and Title 49 of the Code of Federal Regulations implemented by Title 13 of the California Code of Regulations) also impose strict regulation for the safe transportation of hazardous materials. The Project will be subject to these state, federal, and local laws and regulations during construction and operation.

Overall, compliance with all applicable laws and regulations during Project construction and the community’s operation as a residential neighborhood would reduce the potential impacts associated with the routine transport, use, storage, or disposal of hazardous materials to less than significant levels. No mitigation is required. c) Less Than Significant. The Project has a less than significant potential to emit hazardous emissions or handle hazardous or acutely hazardous materials, substances, or waste during or following construction of the subject single-family community. The nearest school is the Bubbling Wells Elementary School, approximately 0.55 miles northeast of the Project site. No school is located within ¼ mile of the site. No impact is anticipated.

Item Number: 4.

City of Desert Hot Springs
Date: October 2021
Project Name: Rancho Descanso Specific Plan, TTM 38200, Dev Permit 21-18

d) No Impact. No impact is anticipated because the Project site is not included in a list of hazardous materials sites compiled pursuant to Government Code Section 65962.5.
e) No Impact. The Palm Springs International Airport is located approximately 5.9 miles south of the subject property. The subject site is not located within the boundaries of the airport land use compatibility plan. The site is not located in the vicinity of a private airstrip. The Project will not result in safety hazards for people living or working in the area. No impact is anticipated.
f) Less Than Significant Impact. The proposed Project will not alter the existing circulation pattern in the Project area or adversely impact evacuation plans. The Project will result in the buildout of the west right-of-way of Avenida Descanso and partial or complete construction of Camino Campesino on the north, which will improve area connectivity to the Palm Drive major arterial and emergency access. Impacts to emergency access will be less than significant.
g) No Impact. The Project site is not located in a wildlands area and surrounding vacant lands are very sparsely vegetated with creosote scrub. The site and vicinity are not within or near a wildland fire hazard zone, and are thus not susceptible to wildfires. Therefore, the proposed Project will not expose people or structures to significant risks associated with wildland fires. No Project related impact is expected.

Mitigation Measures
None required.

Monitoring:

None required.

Item Number: 4.

City of Desert Hot Springs
Date: October 2021
Project Name: Rancho Descanso Specific Plan, TTM 38200, Dev Permit 21-18

X. HYDROLOGY AND WATER QUALITY
Would the project: Potentially
Significant
Impact
Less Than
Significant
with
Mitigation
Incorporated
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?
b) Substantially decrease groundwater
supplies or interfere substantially with
groundwater recharge such that the project may
impede sustainable groundwater management
of the basin?
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 off-site;
(ii) substantially increase the rate or amount
of surface runoff in a manner which would
result in flooding on- or off-site;
(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
(iv) impede or redirect flood flows?
(d) In flood hazard, tsunami, or seiche zones,
risk release of pollutants due to project
inundation?
(e) Conflict with or obstruct implementation of a
water quality control plan or sustainable
groundwater management plan?
Sources: Draft City of Desert Hot Springs General Plan, February 2020; Desert Hot Springs General Plan Update and Zoning Amendment Draft EIR, February 2020; “County of Riverside Environmental Impact Report No. 521 Public Review Draft, February 2015; Mission Springs Water District 2015 Urban Water Management Plan, June 20, 2016; New Wastewater Plant Addresses Development/Growth; https://www.mswd.org/article.aspx?id=11; accessed April 2020; Final - Preliminary Design ReportInterstate 10 and Indian Avenue Area-Sewer System," prepared by Mission Springs Water District in 2012; Preliminary Hydrology and Drainage Report for TTM No. 38200/Rancho Descanso, prepared by Heitec Consulting, August 2, 2021.

Setting
Domestic Water
The Mission Springs Water District (MSWD) provides domestic water to the Project site. The District’s water service area consists of 135 square miles. The District’s water supply source is 100 percent groundwater produced from District-owned and operated wells. The District provides water service to approximately 37,600 people in their water Item Number: 4.

City of Desert Hot Springs
Date: October 2021
Project Name: Rancho Descanso Specific Plan, TTM 38200, Dev Permit 21-18

service area (Mission Springs Water District 2015 Urban Water Management Plan). The District also provides sewer service to approximately 26,000 people in Desert Hot Springs, Desert Crest Country Club and Dillon Mobile Home Park.

MSWD’s water supply comes from groundwater produced from subbasins within the Coachella Valley Groundwater Basin, which underlies the District’s water service area. MSWD primarily produces groundwater from the Mission Creek Subbasin via 10 active wells. To a lesser extent, the District also produces groundwater from the San Gorgonio Pass Subbasin via four active wells; and from the Garnet Hill Subbasin via one active well.

The existing MSWD distribution system consists of three independent water systems: 1) Desert Hot Springs and surrounding area system, 2) Palm Springs Crest System, and 3) West Palm Springs Village System.

As development within the MSWD service area occurred, numerous storage tanks were constructed at varying elevations to provide adequate pressure to its various service areas. The MSWD system, inclusive of all three distribution systems, has approximately 1.26 million linear feet of pipeline with total storage capacity of 19.65 million gallons (MG) (Mission Springs Water District 2015 Urban Water Management Plan).

Wastewater Treatment
MSWD also provides wastewater collection and treatment services to the City of Desert Hot Springs. The existing wastewater collection system for the water service area consists of a network of approximately 89 miles of sewers, which are concentrated in the central portion of the City where the majority of the populace and businesses reside.

MSWD has an ongoing program to connect existing residences currently on septic systems to sewer collectors that have been constructed or are in the process of being constructed. Since 2005, 4,215 parcels have been converted from septic to sewer service for a total of 7,700 parcels. An additional of 695 parcels was converted in 2016 from septic to sewer service. MSWD operates two wastewater treatment plants serving 9,100 connections and a population of approximately 20,400. The Horton Wastewater Treatment Plant (Horton WWTP), located on Verbena Drive about a half mile south
of Two Bunch Palms Trail, has a capacity of 2.3 million gallons per day (mgd). The Desert Crest Wastewater Treatment Plant, located about a half mile southeast of the intersection of Dillion Road and Long Canyon Road, has a capacity of 0.18 mgd and serves a country club development and mobile home park.

MSWD is planning to develop a new West Valley Water Treatment Plant (WVWTP) in the City, which will be located near I-10. The I-10 and Indian Avenue area will ultimately be served by this new regional wastewater treatment facility. According to MSWD, the first phase of the plant will process about 1.5 million gallons of wastewater per day and will include the construction of a collection system to bring flows from areas now utilizing septic tanks. The District currently does not have recycled water use within their service area, however, there are plans to use recycled water for the irrigation of golf courses, parks, medians and greenbelts upon operation of the WVWTP with tertiary treatment facilities.

The Project site is located 1,600± feet south of the Horton plant, to which wastewater generated by the proposed Project will be conveyed for treatment. There is an existing 8-inch VCP sewer line in the Avenida Descanso rightof-way along he east side of the subject property.

Flood Control/Drainages
The Mission Creek, Big and Little Morongo Creeks, Blind Creek, and Long Creek are the main drainages in the City. These drainages are substantial in area and discharge onto sloping alluvial fans and can generate high velocities. The Riverside County Flood Control District is responsible for the management of regional drainages within and in the vicinity of Desert Hot Springs, including rivers, major streams and their tributaries, and areas of significant sheet flooding. The District is empowered with broad management functions, including flood control planning and construction of drainage improvements for regional flood control facilities, as well as watershed and watercourse protection related to those facilities (General Plan – Flooding and Hydrology Element).

The Project site is located in a FEMA-designated 500-year flood plain with a 0.2% annual chance of flooding. The City implements standard requirements for the retention of storm flows, and participates in the National Pollution Item Number: 4.

City of Desert Hot Springs
Date: October 2021
Project Name: Rancho Descanso Specific Plan, TTM 38200, Dev Permit 21-18

Discharge Elimination System (NPDES) to protect surface waters from pollution. Development projects must retain the increase in runoff from and 100-year storm flow on site.

Surface Water Quality
The surface water quality of regional surface waters is largely dependent upon land uses that affect runoff, such as agriculture, urban development, and industrial land uses. Runoff from storm water and agricultural irrigation can transport pollutants that collect on the ground surface and affect water quality of receiving streams, rivers, and channels. Tributary flood flows are not expected to traverse the subject property. The planned development will rely mostly on desert landscaping and will be bounded by a 6-foot decorative masonry wall.

Regional Water Supplies
The Regional Urban Water Management Plan 2020 Update demonstrates that the District and its water management partners has groundwater resources and sources of groundwater re-use and recharge sufficient to serve additional development in the Plan service area. Regionally, the 2040 projected retail water supply is 230,600 acre-feet.

The annual water demand at Project buildout is approximately 28.1 acre-feet, which is approximately 0.001% of the 2040 projected retail water supply. The proposed Project is consistent with the General Plan designation in which it occurs. This General Plan designation was used by MSWD to determine water demand for the future. Therefore, the Project’s water demand is consistent with MSWD projections for future water needs in the area.

The Project area is located in the Mission Creek Subbasin of the Coachella Valley Groundwater Basin. The Coachella Valley Groundwater Basin is not adjudicated, rather it is jointly managed by CVWD and Desert Water Agency (DWA) under the terms of the 1976 Water Management Agreement. According to the 2020 Regional UWMP, Mission Creek Subbasin has been in overdraft for many years. After two decades of groundwater recharge and source substitution by CVWD and collaborating agencies, Mission Creek Subbasin has exhibited increased storage despite the drought.

Managers are averting overdraft conditions in the Mission Creek Subbasin through groundwater replenishment with Metropolitan imported water (artificial recharge). A replenishment program using Metropolitan State Water Project SWP exchange water was established for the Mission Creek Subbasin with recharge commencing in 2003. The existing replenishment program is effectively increasing water levels and is expected to stabilize or reverse the water level decline. Currently, MSWD, DWA and CVWD jointly manage the Mission Creek subbasin under the terms of the Mission Creek Settlement Agreement (December, 2004). This agreement and the 2003 Mission Creek Groundwater Replenishment Agreement between CVWD and DWA specify that the available SWP water will be allocated between the Mission Creek and Whitewater River Subbasins in proportion to the amount of water produced or diverted from each subbasin during the preceding year. In 2015, production from the Mission Creek Subbasin was about 7 percent of the combined production from these two subbasins.

Description of Impacts
a, e) Less Than Significant Impact. The Project site is located in the Whitewater River watershed. All water providers in the watershed are required to comply with Regional Water Quality Control Board (RWQCB) standards for the protection of water quality, including the preparation of site-specific Water Quality Management Plans for surface waters. MSWD is required to meet water quality requirements in its production and delivery of domestic water. Installation of water lines on the Project site will comply with MSWD and RWQCB standards for domestic water conveyance.

The proposed Project will consist of a 76-lot single-family subdivision with private streets and bounded by a masonry wall. The conditions of approval and Project design features will require the Project to comply with all applicable sanitary sewer system connection requirements. A Water Quality Management Plan (WQMP) per the Colorado River Basin Regional Board Order No. R7-2008-0001 will also be prepared for this Project. To minimize the pollutant load associated with urban runoff, the Project will be required to comply with NPDES regulations, including a SWPPP. The imposition of conditions of approval, and local and state requirements will ensure that the proposed Project will not violate any water quality standards or waste discharge requirements or conflict with any water quality control plan or sustainable groundwater management plan. Therefore, a less than significant impact is expected.

Item Number: 4.

City of Desert Hot Springs
Date: October 2021
Project Name: Rancho Descanso Specific Plan, TTM 38200, Dev Permit 21-18

b) Less Than Significant Impact. The proposed Project will require water for domestic residential use by 76 future single-family homes and associated landscape irrigation. The per capital water demand figure of 331 gallons per person per day (2020 Coachella Valley Regional Urban Water Management Plan) to calculate water demand that could result from buildout of the Project. Based on unit count and related factors, and assuming an average household size of three (3) persons, it is estimated that Project-wide water demand will be approximately 25,156 gallons per day or 28.1 acre-feet per year. This calculation is inclusive of on-site landscape demand and the aggregation of indirect demand (employers, schools, services, etc.) generated by household formation. Actual per household demand is expected to be less given stringent water conservation measures that have been put into place, including requirements for native desert and other drought-tolerant landscaping. Impacts to local and reginal groundwater supplies in the near and long-term is expected to be less than significant.
c, i-iv) Less Than Significant Impact. The subject site is located on a large alluvial fan that gentle slopes to the south and southeast. There are no obvious patterns of on-site or tributary off0-site flows traversing the site. No major drainages pass near the site. Site development will involve the application of best management practices to control runoff and avoid excessive erosion of siltation on site or downstream. The Project will be a walled and gated community with an on-site stormwater retention basin that will retain excessive flows on site.

No runoff will be discharged that would exceed the capacity city of nearby drainage or flood control facilities or generate additional sources of polluted runoff. There are no substantial tributary flows entering or passing through the subject property. The Project site is located in a FEMA Flood Zone X, which is subject to 0.2 percent annual chance of flooding and is not designated a special flood hazard area. Public street improvements will include concrete curb and gutter that will control and convey street runoff. The proposed Project will neither impede or redirect flood flows. Therefore impacts will be less than significant. d) No Impact. The Project site is located inland, well outside of any tsunami zones. There are no water storage reservoirs or other water bodies in the Project area, and therefore, no seiche would occur. The proposed site is not located in the Wide Canyon Dam inundation area (General Plan Figure SN-4) and will not be subject to any hazard from dam failure. Therefore, potential impacts related to release of pollutants due to project inundation will be less than significant.
e) No Impact. The subject property is not located in proximity of any facilities that are art of a water quality control plan nor would it affect, obstruct or conflict with any sustainable groundwater management plan? Mitigation Measures:

None required.

Monitoring:

None required.

XI. LAND USE AND PLANNING
Would the project: Potentially
Significant
Impact
Less Than
Significant
with
Mitigation
Incorporated
Less Than
Significant
Impact
No
Impact
a) Physically divide an established
community?
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?
Source: City of Desert Hot Springs General Plan, May 2020; Site Survey.

Item Number: 4.

City of Desert Hot Springs
Date: October 2021
Project Name: Rancho Descanso Specific Plan, TTM 38200, Dev Permit 21-18

Setting
The subject lands are designated “Specific Plan” on both the General Plan Land Use Map and the City Zoning Map.

An existing Specific Plan (Aventura Palms II) is established on the subject property, which will be rescinded and superseded by the subject Rancho Descanso Specific Plan. The proposed Project is on a contiguous holding and its development will not separate, isolate or divide any community or neighborhood. The proposed Project is consistent with the City General Plan and Zoning Ordinance and will not cause any conflicts with these or other land use policies affecting the subject property.

Discussion of Impacts
a) No Impact. The Project site is currently vacant and undeveloped. It is self-contained and a contiguous holding the development of which will not divide any neighborhood or community. Therefore, the Project will have no impact of this nature.
b) No Impact. The subject lands are designated “Specific Plan” on both the General Plan Land Use Map and the City Zoning Map. An existing Specific Plan (Aventura Palms II) is established on the subject property, which will be rescinded and superseded by the subject Rancho Descanso Specific Plan.

Mitigation Measures:

None required.

Monitoring:

None required.

XII. MINERAL RESOURCES
Would the project:

Potentially
Significant
Impact
Less Than
Significant
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?
b) Result in the loss of availability of a locally
important mineral resource recovery site
delineated on a local general plan, specific plan
or other land use plan?
Source: City of Desert Hot Springs General Plan, May 2020; Mineral Land Classifications: Aggregate Materials in the Palm Springs Production-consumption Region, Riverside County, California. Special Report 159 (SR 159) by California Department of Conservation Division of Mines and Geology.

Setting
In the Coachella Valley, mineral resources are largely limited to aggregates, such as sand, gravel, and crushed stone. These are major components of concrete, plaster, stucco, road base and fill, which are essential to the construction industry. The Palm Springs Production-Consumption (P-C) Region is a 631 square mile area in the Coachella Valley that is heavily mined for aggregate. According to the California Geological Survey, the Palm Springs P-C Region has 30,072 acres classified as lands where significant mineral deposits are present, or where it is judged that a high likelihood for their presence exists. The Palm Springs region contains 3.2± billion tons of aggregate resources.

According to California Geological Survey Special Report 198, the average local annual per capita consumption rate for aggregate in the Palm Springs Production-Consumption Region is 9.6 tons. While the Coachella Valley has an abundant, high-quality local supply of PCC-grade aggregate, a desirable commodity for development markets, Item Number: 4.

City of Desert Hot Springs
Date: October 2021
Project Name: Rancho Descanso Specific Plan, TTM 38200, Dev Permit 21-18

transportation costs are a major component affecting cost competitiveness. Given the widespread deposition of aggregate materials in southern California, demand for local resources is expected to remain largely local. The reserves are expected to meet local demand and provide adequate supply at current rates of consumption through the year 2038.

The sand and gravel deposits within the City are an important economic resource, used for road base and similar applications. Other mineral deposits occurring in the region include copper, limestone, specialty sands, and tungsten. These deposits are limited to rocky outcroppings occurring in the Little San Bernardino Mountains and have not been exploited.

The Project site is designated as Specific Plan in the General Plan Land Use Map. No existing sand or gravel operations occur in the vicinity of the Project site. Surrounding lands are largely in urban development and the nearest minable drainage is approximately 067 miles to the west in the Mission Creek/Morongo Wash drainage.

Discussion of Impacts
a, b) No Impact. The City of Desert Hot Springs occurs primarily on alluvial fans, which are sand and gravel deposits discharged by the surrounding canyons. Sand and gravel are often used as road bases and other foundation materials. Per the State of California Department of Conservation, Division of Mines classification, the Project site is located in MRZ-3, which indicates areas containing known or inferred mineral occurrences of undetermined mineral resource significance. There are no other state-designated Mineral Resource Zones (MRZ) or permitted mining operations in the vicinity of the Project site (General Plan Figure OS-4). The Project site is located in a sparsely developed area designated for industrial and residential development, and is not zoned for mineral resource extraction. No impact is expected.

Mitigation Measures:

None required.

Monitoring:

None required.

Item Number: 4.

City of Desert Hot Springs
Date: October 2021
Project Name: Rancho Descanso Specific Plan, TTM 38200, Dev Permit 21-18

XIII. NOISE
Would the project result in: Potentially
Significant
Impact
Less Than
Significant
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?
b) Generation of excessive groundborne
vibration or groundborne noise levels?
c) For a project located within the vicinity of a
private airstrip or an airport land use plan or,
where such a plan has not been adopted, within
two miles of a public airport or public use airport,
would the project expose people residing or
working in the project area to excessive noise
levels?
Sources: City of Desert Hot Springs General Plan, May 2020; Riverside County Airport Land Use Compatibility Plan, Volume 1: Policy Document, October 14, 2004; Rancho Descanso Noise Impact Analysis, prepared by Urban Crossroads, Inc September 20, 2021.

Setting
According to the US Environmental Protection Agency (US EPA), the main sources of noise include road traffic, aircraft, railroads, construction, industry, noise in buildings, and consumer products (EPA Clean Air Act Title IV - Noise Pollution). Primary sources of noise in the City include traffic on major roadways. The City has established goals, policies, and programs to limit and reduce the effects of noise intrusion on sensitive land uses and to set acceptable noise levels for varying types of land uses. As part of the development of the Noise Element of the General Plan, noise level measurements were collected at various locations throughout the City to help characterize noise conditions and to set standards for normally acceptable, conditionally acceptable, and generally unacceptable noise levels (Table SN-2; General Plan).

The Project site is located approximately 350 feet east of the six-lane Palm Drive arterial, which is the primary access to the City from US Interstate-10. It is bounded on the east by the existing and partially built-out Avenida Descanso and on the north by the future Camino Campesino local roadway. A noise study was prepared for this Project and noise monitoring was conducted at five locations, including on the west side of Palm Drive, and the north, south and east boundaries of the subject property. Impact significance criteria are set forth in the table below.

Item Number: 4.

City of Desert Hot Springs
Date: October 2021
Project Name: Rancho Descanso Specific Plan, TTM 38200, Dev Permit 21-18

Analysis Condition(s) Significance Criteria
Daytime Nighttime
On-Site
Traffic
Exterior Noise Level Criteria1 65 dBA CNEL
Interior Noise Level Standard2 45 dBA CNEL
Construction
Noise Level Threshold3 80 dBA Leq
Vibration Level Threshold4 0.3 PPV (in/sec) 1 City of Desert Hot Springs General Plan Noise and Safety Element. 2 California Code of Regulations, Title 24, Building Standards Administrative Code, Part 2. 3 Federal Transit Administration, Transit Noise and Vibration Impact Assessment Manual. 4 Caltrans Transportation and Construction Vibration Manual. "Daytime" = 7:00 a.m. to 10:00 p.m.; "Nighttime" = 10:00 p.m. to 7:00 a.m.

Construction Noise
The potential impacts resulting from the short-term construction activities associated with the development of the Project were also evaluated. According the Municipal Code Section 9.04.030, noise associated with any construction, erection, alteration, or repair, addition to or improvement of any building, structure, road or improvement to realty between the hours of 5:00 p.m. of each day and 7:00 a.m. of the next day, except when daylight savings time is in effect. During such time as daylight savings time is in effect in the City, no such activities are permitted between the hours of 6:00 p.m. of each day and 6:00 a.m. of the next day.

In addition, neither the General Plan or Municipal Code establish numeric maximum acceptable construction source noise levels at potentially affected receivers for CEQA analysis purposes. Therefore, a numerical construction threshold based on Federal Transit Administration (FTA) Transit Noise and Vibration Impact Assessment Manual was used for analysis of daytime construction impacts. The FTA considers a daytime exterior construction noise level of 80 dBA Leq as a reasonable threshold for noise sensitive residential land use.

Discussion of Impacts
a) Less Than Significant Impact. The Project site is currently undeveloped. The main noise source is vehicular traffic from nearby roadways (Palm Drive, Avenida Descanso). The nearest existing sensitive receptors are singlefamily homes to the north, south and east. Palm Drive has the highest existing noise levels and has been modeled to calculate noise levels in 2040.

To satisfy the City of Desert Hot Springs exterior noise level standards for residential land use, the construction of the planned minimum 6-foot-high noise barrier is required for the private outdoor living area (backyards) of units closest to Palm Drive, Camino Campesino and Ave Descanso. With the planned noise barriers the future exterior noise levels will range from 54.4 to 60.2 dBA CNEL. This noise analysis shows that the planned noise barrier will satisfy the City of Desert Hot Springs 65 dBA CNEL exterior noise level standards for residential land use.

The proposed noise control barriers shall be constructed so that the top of each wall and/or berm combination extends to the planned height above the pad elevation of the lot it is shielding. When the road is elevated above the pad elevation, the barrier shall extend to the recommended height above the highest point between the residential home and the road. The barrier will be comprised of concrete masonry block and will provide no decorative cutouts or line-of-sight openings between shielded areas and the roadways.

The impacts associated with construction noise were also modeled and evaluated, analysing a wide range of construction equipment types, including grader and compactors. Based on this modeled analysis and as measured 50 feet from the noise source, none of the construction activities will generate sustained noise levels in excess of 80 dBA. Therefore, there will be neither a substantial temporary nor permanent increase in ambient noise levels in the vicinity of the Project that would excess of standards established in the City General Plan and Zoning Ordinance. general plan or noise ordinance, or applicable standards of other agencies? b) Less Than Significant Impact. Ground-borne vibration and/or ground-borne noise may be produced during construction of the proposed Project. The human threshold of perception for vibration is 0.0018 inches/second, and Caltrans set significant thresholds of 0.3 inches/second PPV. Construction of the proposed Project would not necessitate the use of pile drivers, which are known to generate substantial construction vibration levels. The Item Number: 4.

City of Desert Hot Springs
Date: October 2021
Project Name: Rancho Descanso Specific Plan, TTM 38200, Dev Permit 21-18

highest degree of ground-borne vibration would be generated by large bulldozers and during the paving phase from the operation of a vibratory roller.

Based on Federal Transit Administration (FTA) data, vibration velocities from vibratory roller operations are estimated to be approximately 0.1980 inches/second PPV at 26 feet from the source of activity. Therefore, the vibration levels beyond a 26-feet distance from the construction site would be below the Caltrans threshold for human annoyance and impact on structures. The nearest sensitive receptor is a single-family dwelling located at least 60 feet north of the Project; therefore, no construction would occur within 26 feet of the dwelling. As such, no structure or people in the Project vicinity would experience levels of ground-borne vibration or noise above the Caltrans thresholds. Construction-related impacts will be temporary and only occur during the less sensitive daytime hours. Long-term operation of the project is not expected to generate ground-borne vibrations or noise. Overall, impacts would be less than significant regarding generation of ground-borne vibration and noise. c) No Impact. The Palm Springs International Airport is located approximately 5.9 miles south of the subject property. The site is not located in the vicinity of a private airstrip and outside of existing and modeled future airport noise contours. Therefore, no impacts would occur, and no mitigation measures would be required.

Mitigation Measures:

None required.

Monitoring:

None required.

XIV. POPULATION AND HOUSING
Would the project: Potentially
Significant
Impact
Less Than
Significant
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 extension of
roads or other infrastructure)?
b) Displace substantial numbers of existing
people or housing, necessitating the
construction of replacement housing
elsewhere?
Source: City of Desert Hot Springs General Plan, May 2020; CA Department of Finance Demographic Research Unit, Report E-5: Population and Housing Estimates for Cities, Counties, and the State, January 1, 2011-2021; 2020-2045 Regional Transportation Plan/Sustainable Communities Strategy (RTP/SCS) Demographics and Growth Forecast Technical Report, Southern California Association of Governments, adopted September 3, 2020.

Setting
As of 2021, the City has a population of 30,086, which is projected to grow to 61,000 by 2045. The City is composed of a mix of single- and multi-family residential units, but the majority of housing units are single-family units.

Commercial activity is concentrated along Palm Drive in the City’s core. Of the estimated 11,702 dwelling units in the City, approximately 7,433 or 63% are single-family homes (CA Dept. of Finance 2021 Estimates). The proposed project will add 76 single-family homes or an additional 1% of single-family homes to the City’s housing stock. These will units are expected to help the City meet its need for moderate income housing.

Item Number: 4.

City of Desert Hot Springs
Date: October 2021
Project Name: Rancho Descanso Specific Plan, TTM 38200, Dev Permit 21-18

Discussion of Impacts
a) Less Than Significant Impact. The proposed Project will increase the City’s stock of single-family homes by 1%. While supplying new housing, some of this development may modestly induce further development in the City, although this effect is considered to be less than significant since the Project in and of itself is modest in scale and will have limited effect on employment. For the large part, existing roads and utilities will serve the project site and no new utility extensions are needed to serve the Project. Therefore the Projects effects will be less than significant. b) No Impact. No structures, housing or persons will be displaced as a result of the Project, the subject property being vacant.

Mitigation Measures:

None required.

Monitoring:

None required.

XV. PUBLIC SERVICES
Potentially
Significant
Impact
Less Than
Significant
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:

Fire protection?
Police protection?
Schools?
Parks?
Other public facilities?
Source: City of Desert Hot Springs General Plan, May 2020; Desert Hot Springs General Plan Update and Zoning Amendment Final EIR, May 2020; City’s Parks and Recreation Master Plan (2013).

Setting
Fire Protection: Riverside County Fire Department is responsible for fire protection within the City. The Project site is not located within a state responsibility area. The City contracts for fire protection and prevention services with the Riverside County Fire Department (RCFD) under contract with the California Department of Forestry and Fire Protection. The Riverside County Fire Department operates two fire stations: Station 36 (11535 Karen Avenue) and Station 37 (65958 Pierson Boulevard) in Desert Hot Springs. The nearest fire station is Station #37 at 65958 Pierson Item Number: 4.

City of Desert Hot Springs
Date: October 2021
Project Name: Rancho Descanso Specific Plan, TTM 38200, Dev Permit 21-18

Boulevard, approximately 2.3 miles northwest of the subject property. The subject property lies within or close to a five minute response time from Station 37.

Police Protection: The City Police Station is located at 65950 Pierson Boulevard, approximately 2.3 miles northwest of the subject property, and is staffed full-time, 24 hours a day, seven days a week. All police emergency response calls are dispatched from this station. The Department also maintains mutual aid agreements with the California Highway Patrol, Riverside County Sheriff’s Department, and all other law enforcement agencies in Riverside County.

Schools: The City and the Project site are located within the boundaries of the Palm Springs Unified School District (PSUSD). There are five elementary schools, two middle schools, and one high school, as well as the Wenzlaff Education Center, a continuation school, within the City. The nearest school is the Bubbling Wells Elementary School, approximately 0.6 miles northeast of the Project site.

Parks: According to the City of Desert Hot Springs General Plan (Table HW-1), a total of 71.31 acres are dedicated for parks. The City prepared its Parks and Recreation Master Plan in 2013 to guide the City’s delivery of parks and recreation facilities and services for 10 years (2013 to 2023). The four types of parks serving the Desert Hot Springs area are community, neighborhood, and mini parks, as well as special use parks. Currently, approximately 39.31 acres of land is developed as parks. The nearest parks to the Project site are Mission Springs Park and Desert Hot Springs Soccer Park, both located approximately 1,600 feet north of the subject property.

Discussion of Impacts
Fire Protection:

Less Than Significant Impact. The development of the Project will generate a limited increase the demand on fire service in the City. The subject 76 single-family homes will be of new construction applying the latest in fire safety standards. According to the Final EIR to the City’s General Plan, the Riverside County Fire Department has a trigger of 2000 dwelling units for a fire station; although new developments, for example, near an existing fire station would not require the construction or expansion of facilities. Given the proximity of the nearest fire station, fire personnel should be able to reach the site within the target five-minute response time. Emergency access will be provided to the property via an emergency access drive to be located at the southeast corner of the site and connected to Avenida Descanso. The existing public roadway network will be somewhat enhanced with at least the partial construction of Camino Campesino west of Avenida Descanso and from which the residents will take access.

Although the Project will be walled and gated, two Knox Box devices will be installed at each gate in accordance with the requirements of the City Fire Marshall. The Fire Department will review the Project site plan to ensure it meets applicable fire standards and regulations. No construction of new or expanded fire services or facilities are required for the proposed Project. Project-related fire protection impacts will be less than significant.

Police Protection:

Less Than Significant Impact. Police personnel will be able to access the site using Palm Drive, Avenida Aventura, Avenida Descanso and the future Camino Campesino. According to the Final EIR to the City’s General Plan, the law enforcement standard is 1.5 sworn officers for every 1,000 residents, consistent with General Plan Policy SN2.2 Staff Ratio. As of 2019, the Police Department provided 1.3 sworn officers for every 1,000 residents. The Police Department staffing will need to expand over time to continue to meet the changing needs of the growing Desert Hot Springs community. However, the ultimate development of the site will result in a limited and less than significant increase in demand for police services and will generate a permanent population of 228 persons or less. Less than significant impact is anticipated.

Schools:

No Impact. The Project will be required to pay the State mandated school fees in place at the time that building permits are secured. These fees are designed to offset the impacts of new development, and their associated employees, on schools. The proposed Project will not make a significant contribution to the existing student population, therefore, will have a less than significant impact on schools.

Item Number: 4.

City of Desert Hot Springs
Date: October 2021
Project Name: Rancho Descanso Specific Plan, TTM 38200, Dev Permit 21-18

Parks/ Other Public Facilities:

No Impact. Project buildout is expected to have a modest and less than significant impact on local and/or regional parks. The Project consists of 76 single-family homes in a gated community with private park lands. The site is also in easy walking distance of the Mission Springs Park and Desert Hot Springs Soccer Park. The site is also located in proximity to existing and planned trails, including the existing Long Canyon and Kim Nicol Trails to the northeast and southeast, respectively. The Project will also pay development impact fees that will help to fund existing and future parks. Therefore, the Project will have a less than significant impact on parks.

Mitigation Measures:

None required.

Monitoring:

None required.

XVI. RECREATION
Potentially
Significant
Impact
Less Than
Significant
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?
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?
Source: City of Desert Hot Springs General Plan, May 2020; Project Plans and Draft TTM 38200.

Setting
The City of Desert Hot Springs is currently operating three mini parks (Veteran’s Memorial Park, Hot Springs Park, and Constitution Park), three neighborhood parks (Guy J. Tedesco Park, Wardman Park, and Rotary Park), one community park (Mission Springs Park), and four special use centers (Carl May Community Center, Henry V.

Lozano Community Center, Cabot's Pueblo Museum, and Community Health & Wellness Center) on 39.31 acres.

For future development within the City, park acreage standards are generally established through an acreage requirement per 1,000 residents. The Subdivision Map Act and the Quimby Act (Section 66477 of the Govt. Code) relating to parkland dedication allows a city or town to adopt a local ordinance establishing a citywide park standard and the requirement of parkland dedication, or fair market value in-lieu fees, when there is residential development.

According to the City of Desert Hot Springs General Plan (Table HW-1), a total of 71.31 acres are dedicated for parks. The City prepared its Parks and Recreation Master Plan in 2013 to guide the City’s delivery of parks and recreation facilities and services for 10 years (2013 to 2023). The four types of parks serving the Desert Hot Springs area are community, neighborhood, and mini parks, as well as special use parks. Currently, approximately 39.31 acres of land is developed as parks. The nearest parks to the Project site are Mission Springs Park and Desert Hot Springs Soccer Park, both located approximately 1,600 feet north of the subject property.

Discussion of Impacts
a, b) Less Than Significant. Project buildout is expected to have a modest and less than significant impact on local and/or regional parks. The Project consists of 76 single-family homes in a gated community with private park Item Number: 4.

City of Desert Hot Springs
Date: October 2021
Project Name: Rancho Descanso Specific Plan, TTM 38200, Dev Permit 21-18

lands. The site is also in easy walking distance of the Mission Springs Park and Desert Hot Springs Soccer Park.

The site is also located in proximity to existing and planned trails, including the existing Long Canyon and Kim Nicol Trails to the northeast and southeast, respectively. The Project will also pay development impact fees that will help to fund existing and future parks. Therefore, the Project will have a less than significant impact on parks. No additional parks and other recreational facilities are required to accommodate the employees. Impacts will be less than significant.

Mitigation Measures: None required.

Monitoring: None required.

XVII. TRANSPORTATION
Would the project: Potentially
Significant
Impact
Less Than
Significant
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?
b) Would the project conflict or be
inconsistent with CEQA Guidelines section
15064.3, subdivision (b)?
c) Substantially increase hazards due to a
geometric design feature (e.g., sharp curves
or dangerous intersections) or incompatible
uses (e.g., farm equipment)?
d) Result in inadequate emergency access?
Sources: City of Desert Hot Springs General Plan, May 2020; Desert Hot Springs General Plan Update and Zoning Amendment Final EIR, May 2020; Institute of Transportation Engineers’ Trip Generation Manual, 10th Edition; Rancho Descanso Traffic Impact Analysis, prepared by Trames Solutions, Inc., 8.23.21 Setting
The Project site is located in the City of Desert Hot Springs where the roadway network is comprised of a hierarchy of streets that provide access to and through the City. All roadways in the City are classified into seven roadway types (Urban Arterial, Primary I, Primary II, Secondary I, Secondary II, Collector, and Local Collector streets). The City’s acceptable Level of Service (LOS) for both roadway segments and intersection operations is LOS D or better during peak hour periods. Most area roadways and intersections currently operate at LOS D or better.

Roadways that could be affected by the proposed Project include the currently unimproved Camino Campesino, Avenida Campesino, Avenida Aventura and Palm Drive. Four adjacent and nearby intersections have been analysed as part of the traffic impact analysis prepared for this project, which is included in Appendix D of this IS.

They include Palm Drive intersections with Camino Aventura, Camino Campesino and Camino Campanero; and the Project entry planned on Camino Campesino. Currently, the subject roadways and intersections are operating at Levels of Service of B or better.

Item Number: 4.

City of Desert Hot Springs
Date: October 2021
Project Name: Rancho Descanso Specific Plan, TTM 38200, Dev Permit 21-18

Discussion of Impacts
a) Less Than Significant Impact. The proposed Project is consistent with the City General Plan Land Use and Zoning designations of “Specific Plan”. The Amendment No. 1 Specific Plan project constitutes a 20%± reduction in the number of dwelling units compared to the previously approved Specific plan which is currently in effect. The existing land use designations and previously approved project were established at the time of traffic impact analysis was prepared for the 2020 General Plan update. The proposed Project is consistent with the General Plan Circulation Element in terms of traffic generated, access to transit and other multi-modal facilities, some of which are planned but have not yet been developed. In summary, the proposed Project will not conflict with any program, plan, ordinance or policy addressing the City or regional circulation system, including transit, roadway, bicycle and pedestrian facilities, and impacts will be less than significant. b) Less Than Significant Impact. According to the Governor's Office of Planning and Research (OPR), Senate Bill 743 (SB 743) requires amendments to the CEQA Guidelines to provide an alternative to LOS for evaluating transportation impacts.5 Particularly within areas served by transit, those alternative criteria must “promote the reduction of greenhouse gas emissions, the development of multimodal transportation networks, and a diversity of land uses.” (Public Resources Code Section 21099(b)(1).) Measurements of transportation impacts may include “vehicle miles traveled, vehicle miles traveled per capita, automobile trip generation rates, or automobile trips generated.” CEQA Guidelines were amended to require all lead agencies to adopt vehicle miles traveled (VMT) as a replacement for automobile delay-based level of service (LOS) for identifying transportation impacts. This statewide mandate went into effect July 1, 2020.

Regulations or thresholds pertaining to vehicle miles traveled (VMT) and the reduction of GHG emissions have not been adopted by the City of Desert Hot Springs. Therefore, the following Project VMT analysis is based on the adopted County of Riverside’s Transportation Analysis Guidelines for Level of Service & Vehicle Miles Traveled (December 2020), which the City utilizes for this analysis.

The Riverside County’s VMT Guidelines describe specific screening criteria based on the location/project type that can be used to identify when a proposed land use project is anticipated to result in a less than significant impact without conducting a more detailed project level VMT analysis. A land use project need only meet one of the screening thresholds to result in a less than significant impact:
• Small Projects, which includes General Light Industrial buildings with area less than or equal to 179,000 SF • Projects Near High Quality Transit
• Low VMT Area
The Project proposes development of a gated 76-unit single-family subdivision on 17.83± acres at a location 350 feet east of the Palm Drive arterial roadway and within one mile of elementary and middle schools, and numerous services and recreational facilities. The proposed residential uses are consistent with the City’s General Plan Specific Plan designation and results in a ±22% reduction in density and related trips and VMTs. Therefore, the Project meets the threshold of Small Projects in the County VMT guidelines and can be determined to have less than significant impacts on circulation. The Project will not conflict or be inconsistent with CEQA Guidelines section 15064.3, subdivision (b).

Alternative Transportation
There are currently no bike lanes, transit routes, or other multi-modal facilities within the Project area; however, bicycle facilities are planned along Dillon Road and 15th Avenue in the General Plan (Figure MI-5). The CV Link multi-modal pathway will come within 0.50 miles of the Project site. It will extend north on Palm Drive to Dillon Road and then proceed west to the Morongo Wash/Mission Creek drainage where it will continue north along these drainages.
5 Transportation Impacts (SB 743) by Governor's Office of Planning and Research (OPR), http://opr.ca.gov/ceqa/updates/sb743/, accessed September 2021.

Item Number: 4.

City of Desert Hot Springs
Date: October 2021
Project Name: Rancho Descanso Specific Plan, TTM 38200, Dev Permit 21-18

SunLine Transit Agency provides bus transit services to the Coachella Valley, including the City of Desert Hot Springs. There are established bus routes to the east of the Project area on Palm Drive, and future bus routes are planned in the Project area. There is a SunLine bus stop located approximately 500 feet southwest of the Project site on Palm Drive. Residents and visitors will have access to alternative transportation, and the impacts are expected to be less than significant.
d) No Impact. The Project site is currently accessed via Avenida Descanso and Camino Aventura. Access to the area will be improved by the at least partial development of Camino Campesino which bounds the Project site on the north and is currently unimproved and will ultimately connect to Palm Drive. These roadways will provide emergency access to the proposed Project. The Project will be developed in accordance with City design guidelines and will not create a substantial increase in hazards due to a design feature. The Project’s access points will be located with adequate sight distances and driveway stacking will be constructed to City standards. Projectgenerated traffic will be consistent with existing and projected traffic in the area. No Project-related impact is anticipated.

Mitigation Measures:

None required.

Monitoring:

None required.

XVIII. TRIBAL CULTURAL RESOURCES
Would the project:

Potentially
Significant
Impact
Less Than
Significant
with
Mitigation
Incorporated
Less Than
Significant
Impact
No
Impact
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), or
Item Number: 4.

City of Desert Hot Springs
Date: October 2021
Project Name: Rancho Descanso Specific Plan, TTM 38200, Dev Permit 21-18

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 Resources Code
Section 5024.1, the lead agency shall
consider the significance of the resource to
a California Native American tribe.

Sources: City of Desert Hot Springs General Plan, May 2020; Desert Hot Springs General Plan Update and Zoning Amendment Final EIR, May 2020; Historical/Archaeological Resources Survey Report, TTM 38200, City of Desert Hot Springs, Riverside County, California, prepared by CRM TECH, September 30, 2021.

Setting
As discussed in the Section V, Cultural Resources, the City of Desert Hot Springs is located in the Coachella Valley where the most recent identifiable native culture to evolve is the Desert Cahuilla. The oldest cultural resources reported in the city are from the “Paleo-Indian Period” which dates back to at least 11,000 B.C.

According to the City’s General Plan, prehistoric resources may occur in the vicinity of fault-related mesquite and palms, as well as resources associated with mountain washes, streams and canyons. The Mission Creek and Banning fault zones should be considered sensitive potential resources areas. Mesquite thickets that generally occur in dune areas are also sensitive areas since mesquite and screwbean pods were staples in the diet of the region’s Cahuilla Indians. These resources are sparsely distributed within the City boundaries.

Discussion of Impacts
a i, ii) Less Than Significant Impact. As discussed above in Section V, Cultural Resources, no historical or archaeological resources are known to occur on the subject property or the vicinity, nor are any expected because the property is not located in any area identified to be sensitive for the occurrence of cultural resource sensitivity.

An intensive site survey was conducted on the subject property, which did not encounter either significant historical or archaeological resources.

The Project archaeologists concluded that the Project site does not contain any tribal cultural resource 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), as confirmed by the City of Desert Hot Springs as the lead agency. However, excavation at the site could extend to 4 feet deep, which could result in uncovering of buried resources. During grading, any discovered cultural resources would be qualified as a resource defined under Public Resources Code section 5020.1(k).

The City conducted Tribal Consultation in conformance with the AB 52 requirements and contacted 14 tribes in writing. As of October 5, 2021, no responses have been received. Once the consultation concludes, any requests and input from consultation will be included in conditions of approval and/or added to this Initial Study prior to completion of the environmental review process.

To protect potential tribal cultural resources, Mitigation Measure V-1 is included in Section V Cultural Resources to assure protection of resources uncovered during construction. With implementation of this mitigation measure, impacts to tribal cultural resources would remain less than significant.

Mitigation Measures:

See Section V. V-1.

Monitoring:

See Section V. V-A.

Item Number: 4.

City of Desert Hot Springs
Date: October 2021
Project Name: Rancho Descanso Specific Plan, TTM 38200, Dev Permit 21-18

XIX. UTILITIES AND SERVICE SYSTEMS
Would the project: Potentially
Significant
Impact
Less Than
Significant
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 storm water
drainage, electric power, natural gas, or
telecommunications facilities, the
construction or relocation of which could
cause significant environmental effects?
b) Have sufficient water supplies available to
serve the project and reasonably foreseeable
future development during normal, dry and
multiple dry years?
c) Result in a determination by the
wastewater treatment provider which serves
or may serve the project that it has adequate
capacity to serve the project’s projected
demand in addition to the provider’s existing
commitments?
d) Generate solid waste in excess of State or
local standards, or in excess of the capacity
of local infrastructure, or otherwise impair the
attainment of solid waste reduction goals?
e) Comply with federal, state, and local
management and reduction statutes and
regulations related to solid waste?
Source: City of Desert Hot Springs General Plan, May 2020, Desert Hot Springs General Plan Update and Zoning Amendment Final EIR, May 2020; CalRecycle https://www2.calrecycle.ca.gov/SolidWaste/ Site/Search; Accessed September 2021; Desert Valley Disposal Inc. (DVD), http://www.desertvalleydisposal.com; Accessed September 2021.

Setting
Domestic Water
The Project site is located within the Mission Springs Water District (CMSWD) service area for domestic water. The District’s primary water source is groundwater extracted through a system of wells from the Mission Creek Subbasin.

In addition to groundwater, MSWD relies on imported water brought to the region by regional canals, which is stored or recharged into the Mission Creek aquifer at basins to the northwest and adjacent to the Mission Creek Wash.

MSWD owns and operates the water distribution system within its service area, which is generally located under existing streets in the public right-of-way. The Project will connect to the existing water line within Avenida Descanso in the Project vicinity. In the most recent Urban Water Management Plan (2015 Update), a more intense residential land use was approved and was considered in the water demand estimates for the City and the MSWD service area. The proposed Project represents a net ±22% reduction in the number of residences, which is expected to result in a proportionate water demand reduction. Therefore, it is demonstrated that the District has available, and can supply in the future, sufficient water to serve additional development in its service area.

Item Number: 4.

City of Desert Hot Springs
Date: October 2021
Project Name: Rancho Descanso Specific Plan, TTM 38200, Dev Permit 21-18

Wastewater Treatment
The Project site is located within the MSWD sanitary sewer district, which has wastewater collection facilities located in the Avenida Descanso right-of-way and to which the proposed Project will connect. According to the City General Plan, MSWD has an ongoing program to connect existing residences currently on septic systems to sewer collectors that have been constructed or are in the process of being constructed.

The MSWD Horton Wastewater Treatment Plant (Horton WWTP), located on Verbena Drive about 2,000 feet north of the Project site, has a capacity of 2.3 million gallons per day. The Desert Crest Wastewater Treatment Plant, located about one-half mile southeast of the intersection of Dillon Road and Long Canyon Road, has a capacity of

0.18 million gallons/day and serves a country club development and mobile home park. The Horton plant will serve the Project site. Current wastewater facilities are not adequate to serve the anticipated growth in the City. To provide for the type and scale of development planned in the City, substantial expansion of wastewater facilities is planned.

Storm Water Management
Storm water drainage infrastructure within the City consists of a network of natural and improved streams, storm drains, storm channels, and catch basins intended to manage stormwater that flows into the Whitewater River. The Project site is located in a FEMA Flood Zone X, which represents 0.02 percent annual chance flood (500-year flood hazard) and is not a special flood hazard area. The Project area is subject to City requirements relating to flood control. The City implements standard requirements for the retention of storm flows, and participates in the National Pollution Discharge Elimination System (NPDES) to protect surface waters from pollution. Development projects must retain the incremental runoff from the 100-year storm flow on site. See discussion in Section X, Hydrology and Water Quality.

Solid Waste
Desert Valley Disposal, Inc. (DVD) provides solid waste disposal through a franchise agreement with the City. DVD is the only authorized, franchised waste collection hauler for the City. Services include complete residential, commercial and roll-off trash disposal. Trash and recycled materials are collected from customers in the City and transported to the Lambs Canyon Landfill, located at 16411 Lamb Canyon Road, Beaumont. Lambs Canyon Landfill is operated by the County of Riverside.

Utility Providers
The Project area is currently served by the following utilities and service providers:

Electricity: Southern California Edison
Gas: Southern California Gas Company
Telephone: Frontier
Cable: Spectrum
Discussion of Impacts
a & c) Less Than Significant Impact. The Project area is currently served by existing water, sewer, electricity, natural gas, and telecommunication services. The proposed Project will require connection to the MSWD’s sewage collection system, which includes an 8-inch line within the Avenida Descanso right-of-way (see TTM No. 38200).

The proposed Project will connect to existing local utility network for water, sewer, electricity, natural gas, and telecommunication services within Avenida Descanso adjacent to the Project site, and will not require the construction of any additional facilities for these services, as the proposed Project will not significantly increase demand for these services. As discussed in Section X c, ii-iii) above, the proposed drainage facility onsite and compliance with existing regulatory programs would ensure that the Project will not create or contribute runoff water which would exceed the capacity of existing or planned stormwater drainage systems. The Project is not expected to require or result in the construction or relocation of new or expanded utility facilities. Impacts will be less than significant.
b) Less Than Significant Impact. Project domestic water will be provided by the MSWD utilizing existing wells, distribution system MSWD’s primary water source is groundwater extracted through a system of wells from the Mission Creek Subbasin. In addition, MSWD benefits from groundwater recharge in the upper Mission Creek aquifer from the Metropolitan Water District’s Colorado River Aqueduct. The Project will connect to the existing water line within Avenida Descanso. In the most recent Urban Water Management Plan (2015 Update), a more intense Item Number: 4.

City of Desert Hot Springs
Date: October 2021
Project Name: Rancho Descanso Specific Plan, TTM 38200, Dev Permit 21-18

residential land use was approved and was considered in the water demand estimates for the City and the MSWD service area. The proposed Project represents a net ±22% reduction in the number of residences, which is expected to result in a proportionate water demand reduction. Therefore, it is demonstrated that the District has available, and can supply in the future, sufficient water to serve additional development in its service area. d & e) Less Than Significant Impact. Desert Valley Disposal, Inc. provides solid waste services to the City of Desert Hot Springs. Currently, the City utilizes the Edom Hill Transfer Station, which serves as a local collection point to the final disposal site and does not have a limit of daily transfer amount. Lamb Canyon Landfill is permitted to receive 5,000 tons per day and has a total capacity of 38.9 million cubic yards. As of 2015, the landfill is estimated to have a remaining capacity of 19.2 million cubic yards (49% of total capacity). Lamb Canyon Landfill is estimated to operate until 2029.

Construction of the proposed Project would generate solid waste in the form of construction waste and debris. The Project applicant would be required to submit a construction and demolition (C & D) waste plan as part of the building permit application. The plan would need to demonstrate that the diversion requirements of Municipal Code Section 8.08.040 are met, including diversion of at least 50 percent of all construction waste for new construction.

Non-hazardous construction materials that cannot be reused or recycled would be accepted for disposal at municipal Riverside County landfills. Compliance with the City’s requirements will assure that impacts associated with construction waste remain less than significant.

Any hazardous materials (e.g. chemicals, oils, fuels, lubricants, paints, and solvents) used during construction would be recycled, treated, and/or disposed of in accordance with federal, State, and local laws (See Section IX, Hazards and Hazardous Materials). Desert Valley Disposal is responsible for maintaining standards that assure that all waste is handled in a manner that meets local, state and federal standards. These requirements will assure that impacts associated with solid waste disposal remain less than significant.

Mitigation Measures:

None required.

Monitoring:

None required.

XX. 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
with
Mitigation
Incorporated
Less Than
Significant
Impact
No
Impact
a) Substantially impair an adopted
emergency response plan or emergency
evacuation plan?
b) Due to slope, prevailing winds, and other
factors, exacerbate wildfire risks, and thereby
expose project occupants to, pollutant
concentrations from a wildfire or the
uncontrolled spread of a wildfire?
c) Require the installation or maintenance of
associated infrastructure (such as roads, fuel
breaks, emergency water sources, power
lines or other utilities) that may exacerbate fire
risk or that may result in temporary or ongoing
impacts to the environment?
Item Number: 4.

City of Desert Hot Springs
Date: October 2021
Project Name: Rancho Descanso Specific Plan, TTM 38200, Dev Permit 21-18

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?
Sources: City of Desert Hot Springs General Plan, May 2020; Desert Hot Springs General Plan Update and Zoning Amendment Final EIR, May 2020.

Setting
The California Department of Forestry and Fire Protection (CalFire) prepares maps that identify state responsibility areas (SRA) and Very High Fire Hazard Severity Zones (VHFHSZ). These maps show that the majority of Desert Hot Springs is located in local responsibility areas and outside fire hazard zones. According to Figure SN-5: Wildfire Hazards in the City’s General Plan, the Project area is not located within or near any locally or state designated fire hazard zones or SRAs. In addition to the City’s implementation of the California Fire Code, development standards from the Riverside County Fire Department also apply. These standards are implemented through the review of development proposals by the RCFD in coordination with the City staff’s review.

Discussion of Impacts
a) No Impact. The Project site is not located in or near a state responsibility area or lands classified as very high fire hazard severity zones. The primary emergency evacuation routes in the City include I-10, Indian Canyon Avenue, Dillon Road, Pierson Boulevard, and Palm Drive. The Project site has good access to emergency evacuation routes of Dillon Road and Palm Drive via Camino Campesino and Camino Aventura.

Currently, the site is undeveloped and surrounded by single-family residential development in gated and ungated neighborhoods. Project primary access will be on the future Camino Campesino with secondary emergency access from Avenida Descanso. These access points will be subject to review and approval by the City of Desert Hot Springs Fire Marshall. No impact is anticipated because no change in emergency response or evacuation plans is expected for the proposed Project.
b, c) No Impact. The Project site is not located within a wildfire hazard severity zone or a wildland-urban interface (WUI). The urban area in which the Project is located has a very low threat from wildland fires because of lack of vegetation, distance from mountain slopes, and intervening urban development. Development of the site would not expose people or structures to significant wildfire risks. The proposed Project will include road easement and have paved access to urban arterial roadways in the Project area. No new wildfire risk infrastructure will be required. No impacts would occur.
d) No Impact. The Project site is located on the lower alluvial fan of the Little San Bernardino Mountains where there is very low potential for flooding (see Section X c-d), landslide, or post-fire slope instability. Therefore, the proposed Project would not expose people or structures to significant risks such as downslope or downstream flooding or landslides, post-fire slope instability, or drainage changes. No impact is anticipated.

Mitigation Measures:

None required.

Monitoring:

None required.

Item Number: 4.

City of Desert Hot Springs
Date: October 2021
Project Name: Rancho Descanso Specific Plan, TTM 38200, Dev Permit 21-18

XXI. MANDATORY FINDINGS OF

SIGNIFICANCE
Does the project:

Potentially
Significant
Impact
Less Than
Significant
with
Mitigation
Incorporated
Less Than
Significant
Impact
No
Impact
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?
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)?
c) Does the Project have environmental
effects, which will cause substantial adverse
effects on human beings, either directly or
indirectly?
Discussion of Impacts
a) Less Than Significant Impact with Mitigation.

Biological Resources: The Project site is not located within a CVMSHCP-designated conservation area and does not contain any wildlife corridors or biological linkage areas. On-site vegetation is limited to scattered plants of the Creosote scrub community and herbaceous plants. The site does provide habitat for desert owl; therefore, preconstruction surveys will be required to avoid impacts to owls and other nesting birds covered by the MBTA. In addition, the site is subject to payment of the Development Mitigation Fee to mitigate potential impacts to covered species under the CVMSHCP.

The proposed Project will not significantly reduce fish or wildlife habitat or otherwise adversely impact a fish or wildlife species. The construction of the Project has the potential to impact nesting birds, but the Mitigation Measures IV-1 through IV-3 and monitoring program IV-A included in this document will reduce those impacts to less than significant levels.

Cultural Resources: No cultural resources are known to exist within or adjacent to the Project site. Since the Project will require excavation, there is a low potential for unknown resources to be uncovered. Mitigation Measure V-1 and monitoring program V-A provided in this document will ensure that impacts to cultural and/or tribal resources are less than significant in the unlikely event that resources are discovered during Project development.

Overall, there will be no significant environmental impacts which cannot be mitigated. Project related impacts, including cumulative impacts, are considered less than significant.

Item Number: 4.

City of Desert Hot Springs
Date: October 2021
Project Name: Rancho Descanso Specific Plan, TTM 38200, Dev Permit 21-18

b) Less Than Significant Impact. The Project will contribute to the cumulative impacts of development in the City of Desert Hot Springs and broader Coachella Valley. No other projects are known or scheduled to occur in the Project area. However, the proposed Project’s impacts will be consistent with the General Plan designation for the property, and no significant cumulative impacts are expected. All environmental impacts that could occur as a result of the proposed Project would be less than significant with the implementation of mitigation measures included herein, and when viewed in conjunction with other closely related past, present or reasonably foreseeable future projects, would not be significant.
c) Less Than Significant Impact. The proposed Project will not have environmental effects which will cause substantial adverse effects on human beings, either directly or indirectly, with the implementation of the City’s Municipal Code, other standard requirements and requirements of law, as described in this document.

Item Number: 4.

City of Desert Hot Springs
Date: October 2021
Project Name: Rancho Descanso Specific Plan, TTM 38200, Dev Permit 21-18

APPENDIX A
CalEEMOD Air Quality and Greenhouse Gas Modeling
Prepared by
Terra Nova Planning & Research, Inc.
42635 Melanie Place, Suite 101
Palm Desert, CA 92211
Item Number: 4.

City of Desert Hot Springs
Date: October 2021
Project Name: Rancho Descanso Specific Plan, TTM 38200, Dev Permit 21-18

APPENDIX B
Biological Resource Assessment &
Coachella Valley Multiple Species Habitat Conservation Plan Compliance Report Prepared by
WOOD
1845 Chicago Avenue, Ste D
Riverside, CA 92507
Item Number: 4.

City of Desert Hot Springs
Date: October 2021
Project Name: Rancho Descanso Specific Plan, TTM 38200, Dev Permit 21-18

APPENDIC C
Historical/Archaeological Resources Survey Report
Prepared by

CRM TECH
1016 E. Cooley Drive, Suite A & B
Colton, CA 92324
Item Number: 4.

City of Desert Hot Springs
Date: October 2021
Project Name: Rancho Descanso Specific Plan, TTM 38200, Dev Permit 21-18

APPENDIX D
Rancho Descanso Traffic Impact Analysis
Prepared by
Trames Solutions, Inc.
4225 Oceanside Blvd. #354H
Oceanside, CA 92056
Item Number: 4.

City of Desert Hot Springs
Date: October 2021
Project Name: Rancho Descanso Specific Plan, TTM 38200, Dev Permit 21-18

APPENDIX E
Rancho Descanso Geotechnical Report
Prepared by
Sladden Engineering
45090 Golf Center Parkway, Ste F
Indio, CA 92201
Item Number: 4.

RANCHO DESCANSO

SPECIFIC PLAN
(Amendment No. 1 to the Aventura Palms II Specific Plan) And
Tentative Tract Map No. 38200
(And Associated Lot Line Adjustment)

AIR QUALITY AND GREEENHOUSE GAS ANALYSIS

CALEEMOD MODEL OUTPUT

PREPARED BY
Terra Nova Planning & Research, Inc.
42635 Melanie Place Suite 101
Palm Desert, CA 92211
Item Number: 4.

Rancho Descanso, DHS
Salton Sea Air Basin, Summer
Project Characteristics -
Land Use - 76 unit single family residential development.

Construction Phase - Assumes a 2 year buildout with operation in 2023. Assumes paving will occur simultaneously with building construction, and architectural coatings will be applied gradually over time as units are completed.

On-road Fugitive Dust - All roads in project area are paved.

Grading - Preliminary grading calcs = 8267 CY of import.

Road Dust - All roads paved.

Construction Off-road Equipment Mitigation - Standard dust control measures per SCAQMD Rule 403.1.

1.1 Land Usage
Land Uses Size Metric Lot Acreage Floor Surface Area Population Single Family Housing 76.00 Dwelling Unit 17.83 136,800.00 245

1.2 Other Project Characteristics
Urbanization
Climate Zone
Urban
15 Wind Speed (m/s) 3.4 Precipitation Freq (Days) 20

1.3 User Entered Comments & Non-Default Data

1.0 Project Characteristics
Utility Company Southern California Edison
Operational Year 2023
CO2 Intensity
(lb/MWhr)
390.98 CH4 Intensity 0.033
(lb/MWhr)
N2O Intensity 0.004
(lb/MWhr)
Table Name Column Name Default Value New Value
tblConstDustMitigation WaterUnpavedRoadMoistureContent 0 0.5 tblConstDustMitigation WaterUnpavedRoadVehicleSpeed 0 40 tblConstructionPhase NumDays 20.00 260.00
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2.0 Emissions Summary
tblConstructionPhase NumDays 300.00 455.00
tblConstructionPhase NumDays 30.00 40.00
tblConstructionPhase NumDays 20.00 30.00
tblConstructionPhase NumDays 10.00 20.00
tblGrading AcresOfGrading 120.00 17.83
tblGrading AcresOfGrading 30.00 15.00
tblGrading MaterialImported 0.00 8,267.00
tblLandUse LotAcreage 24.68 17.83
tblOnRoadDust HaulingPercentPave 50.00 100.00
tblOnRoadDust HaulingPercentPave 50.00 100.00
tblOnRoadDust HaulingPercentPave 50.00 100.00
tblOnRoadDust HaulingPercentPave 50.00 100.00
tblOnRoadDust HaulingPercentPave 50.00 100.00
tblOnRoadDust VendorPercentPave 50.00 100.00
tblOnRoadDust VendorPercentPave 50.00 100.00
tblOnRoadDust VendorPercentPave 50.00 100.00
tblOnRoadDust VendorPercentPave 50.00 100.00
tblOnRoadDust VendorPercentPave 50.00 100.00
tblOnRoadDust WorkerPercentPave 50.00 100.00
tblOnRoadDust WorkerPercentPave 50.00 100.00
tblOnRoadDust WorkerPercentPave 50.00 100.00
tblOnRoadDust WorkerPercentPave 50.00 100.00
tblOnRoadDust WorkerPercentPave 50.00 100.00
tblRoadDust RoadPercentPave 50 100
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2.1 Overall Construction (Maximum Daily Emission)
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Year lb/day lb/day
2021 4.3787 49.2258 32.4148 0.0755 19.0122 2.0453 21.0576 10.0565 1.8817 11.9382 0.0000 7,432.005 5 7,432.005
5 1.9577 0.2029 7,541.414
5 2022 8.6610 27.1279 32.7229 0.0543 0.3916 1.3823 1.7738 0.1048 1.2887 1.3935 0.0000 5,232.208 7 5,232.208
7 1.3375 0.0279 5,273.968
0 2023 8.5007 15.9910 19.3298 0.0336 0.3079 0.7737 1.0816 0.0826 0.7322 0.8148 0.0000 3,214.119 6 3,214.119
6 0.6328 0.0243 3,237.168
4 Maximum 8.6610 49.2258 32.7229 0.0755 19.0122 2.0453 21.0576 10.0565 1.8817 11.9382 0.0000 7,432.005 5 7,432.005
5 1.9577 0.2029 7,541.414
5 Unmitigated Construction
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Year lb/day lb/day
2021 4.3787 49.2258 32.4148 0.0755 7.1388 2.0453 9.1842 3.7511 1.8817 5.6328 0.0000 7,432.005 5 7,432.005
5 1.9577 0.2029 7,541.414
5 2022 8.6610 27.1279 32.7229 0.0543 0.3916 1.3823 1.7738 0.1048 1.2887 1.3935 0.0000 5,232.208 7 5,232.208
7 1.3375 0.0279 5,273.968
0 2023 8.5007 15.9910 19.3298 0.0336 0.3079 0.7737 1.0816 0.0826 0.7322 0.8148 0.0000 3,214.119 6 3,214.119
6 0.6328 0.0243 3,237.168
4 Maximum 8.6610 49.2258 32.7229 0.0755 7.1388 2.0453 9.1842 3.7511 1.8817 5.6328 0.0000 7,432.005 5 7,432.005
5 1.9577 0.2029 7,541.414
5 Mitigated Construction
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ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio-CO2 Total CO2 CH4 N20 CO2e
Percent
Reduction

0.00 0.00 0.00 0.00 60.24 0.00 49.65 61.55 0.00 44.57 0.00 0.00 0.00 0.00 0.00 0.00 CalEEMod Version: CalEEMod.2020.4.0 Page 4 of 29 Date: 9/29/2021 8:51 AM Rancho Descanso, DHS - Salton Sea Air Basin, Summer
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2.2 Overall Operational
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Area 3.6610 0.7171 6.5459 4.4500e0030.0869 0.0869 0.0869 0.0869 0.0000 834.5041 834.5041 0.0266 0.0151 839.6675 Energy 0.0635 0.5428 0.2310 3.4600e0030.0439 0.0439 0.0439 0.0439 692.9275 692.9275 0.0133 0.0127 697.0452 Mobile 2.5597 2.3862 18.8721 0.0366 3.4251 0.0271 3.4523 0.9134 0.0254 0.9388 3,763.979 7 3,763.979
7 0.1971 0.1877 3,824.837
0 Total 6.2841 3.6461 25.6490 0.0445 3.4251 0.1579 3.5830 0.9134 0.1561 1.0696 0.0000 5,291.411 3 5,291.411
3 0.2370 0.2155 5,361.549
6 Unmitigated Operational
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Area 3.6610 0.7171 6.5459 4.4500e0030.0869 0.0869 0.0869 0.0869 0.0000 834.5041 834.5041 0.0266 0.0151 839.6675 Energy 0.0635 0.5428 0.2310 3.4600e0030.0439 0.0439 0.0439 0.0439 692.9275 692.9275 0.0133 0.0127 697.0452 Mobile 2.5597 2.3862 18.8721 0.0366 3.4251 0.0271 3.4523 0.9134 0.0254 0.9388 3,763.979 7 3,763.979
7 0.1971 0.1877 3,824.837
0 Total 6.2841 3.6461 25.6490 0.0445 3.4251 0.1579 3.5830 0.9134 0.1561 1.0696 0.0000 5,291.411 3 5,291.411
3 0.2370 0.2155 5,361.549
6 Mitigated Operational
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3.0 Construction Detail
Construction Phase
Phase
Number
Phase Name Phase Type Start Date End Date Num Days
Week
Num Days Phase Description
1 Site Preparation Site Preparation 10/1/2021 10/28/2021 5 20 2 Grading Grading 10/29/2021 12/23/2021 5 40
3 Paving Paving 12/24/2021 2/3/2022 5 30
4 Building Construction Building Construction 1/1/2022 9/30/2023 5 455 5 Architectural Coating Architectural Coating 10/1/2022 4/28/2023 5 260 OffRoad Equipment
Phase Name Offroad Equipment Type Amount Usage Hours Horse Power Load Factor Site Preparation Rubber Tired Dozers 3 8.00 247 0.40
Site Preparation Tractors/Loaders/Backhoes 4 8.00 97 0.37 Grading Excavators 2 8.00 158 0.38
Grading Graders 1 8.00 187 0.41
Grading Rubber Tired Dozers 1 8.00 247 0.40
Grading Scrapers 2 8.00 367 0.48
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio-CO2 Total CO2 CH4 N20 CO2e
Percent
Reduction

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Residential Indoor: 277,020; Residential Outdoor: 92,340; Non-Residential Indoor: 0; Non-Residential Outdoor: 0; Striped Parking Area: 0 (Architectural Coating – sqft)
Acres of Grading (Site Preparation Phase): 15
Acres of Grading (Grading Phase): 17.83
Acres of Paving: 0
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3.1 Mitigation Measures Construction
Use Soil Stabilizer
Replace Ground Cover
Water Exposed Area
Grading Tractors/Loaders/Backhoes 2 8.00 97 0.37
Building Construction Cranes 1 7.00 231 0.29
Building Construction Forklifts 3 8.00 89 0.20
Building Construction Generator Sets 1 8.00 84 0.74
Building Construction Tractors/Loaders/Backhoes 3 7.00 97 0.37 Building Construction Welders 1 8.00 46 0.45
Paving Pavers 2 8.00 130 0.42
Paving Paving Equipment 2 8.00 132 0.36
Paving Rollers 2 8.00 80 0.38
Architectural Coating Air Compressors 1 6.00 78 0.48
Trips and VMT
Phase Name Offroad Equipment
Count
Worker Trip
Number
Vendor Trip
Number
Hauling Trip
Number
Worker Trip
Length
Vendor Trip
Length
Hauling Trip
Length
Worker Vehicle
Class
Vendor
Vehicle Class
Hauling
Vehicle Class
Site Preparation 7 18.00 0.00 0.00 11.00 5.40 20.00 LD_Mix HDT_Mix HHDT Grading 8 20.00 0.00 817.00 11.00 5.40 20.00 LD_Mix HDT_Mix HHDT Building Construction 9 27.00 8.00 0.00 11.00 5.40 20.00 LD_Mix HDT_Mix HHDT Paving 6 15.00 0.00 0.00 11.00 5.40 20.00 LD_Mix HDT_Mix HHDT Architectural Coating 1 5.00 0.00 0.00 11.00 5.40 20.00 LD_Mix HDT_Mix HHDT CalEEMod Version: CalEEMod.2020.4.0 Page 7 of 29 Date: 9/29/2021 8:51 AM Rancho Descanso, DHS - Salton Sea Air Basin, Summer
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3.2 Site Preparation - 2021
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Fugitive Dust 18.8616 0.0000 18.8616 10.0166 0.0000 10.0166 0.0000 0.0000 Off-Road 3.8882 40.4971 21.1543 0.0380 2.0445 2.0445 1.8809 1.8809 3,685.656 9 3,685.656
9 1.1920 3,715.457
3 Total 3.8882 40.4971 21.1543 0.0380 18.8616 2.0445 20.9061 10.0166 1.8809 11.8975 3,685.656 9 3,685.656
9 1.1920 3,715.457
3 Unmitigated Construction On-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 0.0923 0.0521 0.7729 1.4900e0030.1506 8.5000e0040.1515 0.0400 7.9000e0040.0407 150.7303 150.7303 5.0400e0034.6000e003152.2259 Total 0.0923 0.0521 0.7729 1.4900e0030.1506 8.5000e0040.1515 0.0400 7.9000e0040.0407 150.7303 150.7303 5.0400e0034.6000e003152.2259 Unmitigated Construction Off-Site
CalEEMod Version: CalEEMod.2020.4.0 Page 8 of 29 Date: 9/29/2021 8:51 AM Rancho Descanso, DHS - Salton Sea Air Basin, Summer
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

3.2 Site Preparation - 2021
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Fugitive Dust 6.9882 0.0000 6.9882 3.7111 0.0000 3.7111 0.0000 0.0000 Off-Road 3.8882 40.4971 21.1543 0.0380 2.0445 2.0445 1.8809 1.8809 0.0000 3,685.656 9 3,685.656
9 1.1920 3,715.457
3 Total 3.8882 40.4971 21.1543 0.0380 6.9882 2.0445 9.0327 3.7111 1.8809 5.5920 0.0000 3,685.656 9 3,685.656
9 1.1920 3,715.457
3 Mitigated Construction On-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 0.0923 0.0521 0.7729 1.4900e0030.1506 8.5000e0040.1515 0.0400 7.9000e0040.0407 150.7303 150.7303 5.0400e0034.6000e003152.2259 Total 0.0923 0.0521 0.7729 1.4900e0030.1506 8.5000e0040.1515 0.0400 7.9000e0040.0407 150.7303 150.7303 5.0400e0034.6000e003152.2259 Mitigated Construction Off-Site
CalEEMod Version: CalEEMod.2020.4.0 Page 9 of 29 Date: 9/29/2021 8:51 AM Rancho Descanso, DHS - Salton Sea Air Basin, Summer
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

3.3 Grading - 2021
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Fugitive Dust 6.4948 0.0000 6.4948 3.3613 0.0000 3.3613 0.0000 0.0000 Off-Road 4.1912 46.3998 30.8785 0.0620 1.9853 1.9853 1.8265 1.8265 6,007.043 4 6,007.043
4 1.9428 6,055.613
4 Total 4.1912 46.3998 30.8785 0.0620 6.4948 1.9853 8.4801 3.3613 1.8265 5.1878 6,007.043 4 6,007.043
4 1.9428 6,055.613
4 Unmitigated Construction On-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Hauling 0.0849 2.7681 0.6775 0.0119 0.3583 0.0452 0.4034 0.0983 0.0432 0.1415 1,257.483 9 1,257.483
9 9.2900e0030.1978 1,316.661
2 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 0.1026 0.0578 0.8588 1.6500e0030.1673 9.5000e0040.1683 0.0444 8.7000e0040.0453 167.4782 167.4782 5.6000e0035.1100e003169.1399 Total 0.1875 2.8259 1.5364 0.0135 0.5256 0.0461 0.5717 0.1427 0.0441 0.1868 1,424.962 1 1,424.962
1 0.0149 0.2029 1,485.801
1 Unmitigated Construction Off-Site
CalEEMod Version: CalEEMod.2020.4.0 Page 10 of 29 Date: 9/29/2021 8:51 AM Rancho Descanso, DHS - Salton Sea Air Basin, Summer
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

3.3 Grading - 2021
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Fugitive Dust 2.4063 0.0000 2.4063 1.2454 0.0000 1.2454 0.0000 0.0000 Off-Road 4.1912 46.3998 30.8785 0.0620 1.9853 1.9853 1.8265 1.8265 0.0000 6,007.043 4 6,007.043
4 1.9428 6,055.613
4 Total 4.1912 46.3998 30.8785 0.0620 2.4063 1.9853 4.3917 1.2454 1.8265 3.0719 0.0000 6,007.043 4 6,007.043
4 1.9428 6,055.613
4 Mitigated Construction On-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Hauling 0.0849 2.7681 0.6775 0.0119 0.3583 0.0452 0.4034 0.0983 0.0432 0.1415 1,257.483 9 1,257.483
9 9.2900e0030.1978 1,316.661
2 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 0.1026 0.0578 0.8588 1.6500e0030.1673 9.5000e0040.1683 0.0444 8.7000e0040.0453 167.4782 167.4782 5.6000e0035.1100e003169.1399 Total 0.1875 2.8259 1.5364 0.0135 0.5256 0.0461 0.5717 0.1427 0.0441 0.1868 1,424.962 1 1,424.962
1 0.0149 0.2029 1,485.801
1 Mitigated Construction Off-Site
CalEEMod Version: CalEEMod.2020.4.0 Page 11 of 29 Date: 9/29/2021 8:51 AM Rancho Descanso, DHS - Salton Sea Air Basin, Summer
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

3.4 Paving - 2021
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Off-Road 1.2556 12.9191 14.6532 0.0228 0.6777 0.6777 0.6235 0.6235 2,207.210 9 2,207.210
9 0.7139 2,225.057
3 Paving 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Total 1.2556 12.9191 14.6532 0.0228 0.6777 0.6777 0.6235 0.6235 2,207.210 9 2,207.210
9 0.7139 2,225.057
3 Unmitigated Construction On-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 0.0769 0.0434 0.6441 1.2400e0030.1255 7.1000e0040.1262 0.0333 6.6000e0040.0339 125.6086 125.6086 4.2000e0033.8300e003126.8550 Total 0.0769 0.0434 0.6441 1.2400e0030.1255 7.1000e0040.1262 0.0333 6.6000e0040.0339 125.6086 125.6086 4.2000e0033.8300e003126.8550 Unmitigated Construction Off-Site
CalEEMod Version: CalEEMod.2020.4.0 Page 12 of 29 Date: 9/29/2021 8:51 AM Rancho Descanso, DHS - Salton Sea Air Basin, Summer
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

3.4 Paving - 2021
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Off-Road 1.2556 12.9191 14.6532 0.0228 0.6777 0.6777 0.6235 0.6235 0.0000 2,207.210 9 2,207.210
9 0.7139 2,225.057
3 Paving 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Total 1.2556 12.9191 14.6532 0.0228 0.6777 0.6777 0.6235 0.6235 0.0000 2,207.210 9 2,207.210
9 0.7139 2,225.057
3 Mitigated Construction On-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 0.0769 0.0434 0.6441 1.2400e0030.1255 7.1000e0040.1262 0.0333 6.6000e0040.0339 125.6086 125.6086 4.2000e0033.8300e003126.8550 Total 0.0769 0.0434 0.6441 1.2400e0030.1255 7.1000e0040.1262 0.0333 6.6000e0040.0339 125.6086 125.6086 4.2000e0033.8300e003126.8550 Mitigated Construction Off-Site
CalEEMod Version: CalEEMod.2020.4.0 Page 13 of 29 Date: 9/29/2021 8:51 AM Rancho Descanso, DHS - Salton Sea Air Basin, Summer
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

3.4 Paving - 2022
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Off-Road 1.1028 11.1249 14.5805 0.0228 0.5679 0.5679 0.5225 0.5225 2,207.660 3 2,207.660
3 0.7140 2,225.510
4 Paving 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Total 1.1028 11.1249 14.5805 0.0228 0.5679 0.5679 0.5225 0.5225 2,207.660 3 2,207.660
3 0.7140 2,225.510
4 Unmitigated Construction On-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 0.0709 0.0382 0.5856 1.2000e0030.1255 6.6000e0040.1262 0.0333 6.1000e0040.0339 122.1551 122.1551 3.7600e0033.5100e003123.2961 Total 0.0709 0.0382 0.5856 1.2000e0030.1255 6.6000e0040.1262 0.0333 6.1000e0040.0339 122.1551 122.1551 3.7600e0033.5100e003123.2961 Unmitigated Construction Off-Site
CalEEMod Version: CalEEMod.2020.4.0 Page 14 of 29 Date: 9/29/2021 8:51 AM Rancho Descanso, DHS - Salton Sea Air Basin, Summer
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

3.4 Paving - 2022
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Off-Road 1.1028 11.1249 14.5805 0.0228 0.5679 0.5679 0.5225 0.5225 0.0000 2,207.660 3 2,207.660
3 0.7140 2,225.510
4 Paving 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Total 1.1028 11.1249 14.5805 0.0228 0.5679 0.5679 0.5225 0.5225 0.0000 2,207.660 3 2,207.660
3 0.7140 2,225.510
4 Mitigated Construction On-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 0.0709 0.0382 0.5856 1.2000e0030.1255 6.6000e0040.1262 0.0333 6.1000e0040.0339 122.1551 122.1551 3.7600e0033.5100e003123.2961 Total 0.0709 0.0382 0.5856 1.2000e0030.1255 6.6000e0040.1262 0.0333 6.1000e0040.0339 122.1551 122.1551 3.7600e0033.5100e003123.2961 Mitigated Construction Off-Site
CalEEMod Version: CalEEMod.2020.4.0 Page 15 of 29 Date: 9/29/2021 8:51 AM Rancho Descanso, DHS - Salton Sea Air Basin, Summer
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

3.5 Building Construction - 2022
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Off-Road 1.7062 15.6156 16.3634 0.0269 0.8090 0.8090 0.7612 0.7612 2,554.333 6 2,554.333
6 0.6120 2,569.632
2 Total 1.7062 15.6156 16.3634 0.0269 0.8090 0.8090 0.7612 0.7612 2,554.333 6 2,554.333
6 0.6120 2,569.632
2 Unmitigated Construction On-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0144 0.2804 0.1394 1.2200e0030.0402 3.4700e0030.0437 0.0116 3.3200e0030.0149 128.1807 128.1807 1.0700e0030.0181 133.5963 Worker 0.1277 0.0688 1.0541 2.1600e0030.2259 1.1900e0030.2271 0.0599 1.1000e0030.0610 219.8791 219.8791 6.7600e0036.3300e003221.9330 Total 0.1421 0.3492 1.1935 3.3800e0030.2661 4.6600e0030.2708 0.0715 4.4200e0030.0759 348.0597 348.0597 7.8300e0030.0244 355.5293 Unmitigated Construction Off-Site
CalEEMod Version: CalEEMod.2020.4.0 Page 16 of 29 Date: 9/29/2021 8:51 AM Rancho Descanso, DHS - Salton Sea Air Basin, Summer
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

3.5 Building Construction - 2022
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Off-Road 1.7062 15.6156 16.3634 0.0269 0.8090 0.8090 0.7612 0.7612 0.0000 2,554.333 6 2,554.333
6 0.6120 2,569.632
2 Total 1.7062 15.6156 16.3634 0.0269 0.8090 0.8090 0.7612 0.7612 0.0000 2,554.333 6 2,554.333
6 0.6120 2,569.632
2 Mitigated Construction On-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0144 0.2804 0.1394 1.2200e0030.0402 3.4700e0030.0437 0.0116 3.3200e0030.0149 128.1807 128.1807 1.0700e0030.0181 133.5963 Worker 0.1277 0.0688 1.0541 2.1600e0030.2259 1.1900e0030.2271 0.0599 1.1000e0030.0610 219.8791 219.8791 6.7600e0036.3300e003221.9330 Total 0.1421 0.3492 1.1935 3.3800e0030.2661 4.6600e0030.2708 0.0715 4.4200e0030.0759 348.0597 348.0597 7.8300e0030.0244 355.5293 Mitigated Construction Off-Site
CalEEMod Version: CalEEMod.2020.4.0 Page 17 of 29 Date: 9/29/2021 8:51 AM Rancho Descanso, DHS - Salton Sea Air Basin, Summer
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

3.5 Building Construction - 2023
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Off-Road 1.5728 14.3849 16.2440 0.0269 0.6997 0.6997 0.6584 0.6584 2,555.209 9 2,555.209
9 0.6079 2,570.406
1 Total 1.5728 14.3849 16.2440 0.0269 0.6997 0.6997 0.6584 0.6584 2,555.209 9 2,555.209
9 0.6079 2,570.406
1 Unmitigated Construction On-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0118 0.2311 0.1331 1.1700e0030.0402 1.7900e0030.0420 0.0116 1.7100e0030.0133 123.8512 123.8512 9.6000e0040.0174 129.0461 Worker 0.1180 0.0608 0.9632 2.0900e0030.2259 1.1200e0030.2270 0.0599 1.0300e0030.0610 213.9838 213.9838 6.0500e0035.8300e003215.8711 Total 0.1299 0.2919 1.0963 3.2600e0030.2661 2.9100e0030.2690 0.0715 2.7400e0030.0742 337.8350 337.8350 7.0100e0030.0232 344.9172 Unmitigated Construction Off-Site
CalEEMod Version: CalEEMod.2020.4.0 Page 18 of 29 Date: 9/29/2021 8:51 AM Rancho Descanso, DHS - Salton Sea Air Basin, Summer
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

3.5 Building Construction - 2023
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Off-Road 1.5728 14.3849 16.2440 0.0269 0.6997 0.6997 0.6584 0.6584 0.0000 2,555.209 9 2,555.209
9 0.6079 2,570.406
1 Total 1.5728 14.3849 16.2440 0.0269 0.6997 0.6997 0.6584 0.6584 0.0000 2,555.209 9 2,555.209
9 0.6079 2,570.406
1 Mitigated Construction On-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0118 0.2311 0.1331 1.1700e0030.0402 1.7900e0030.0420 0.0116 1.7100e0030.0133 123.8512 123.8512 9.6000e0040.0174 129.0461 Worker 0.1180 0.0608 0.9632 2.0900e0030.2259 1.1200e0030.2270 0.0599 1.0300e0030.0610 213.9838 213.9838 6.0500e0035.8300e003215.8711 Total 0.1299 0.2919 1.0963 3.2600e0030.2661 2.9100e0030.2690 0.0715 2.7400e0030.0742 337.8350 337.8350 7.0100e0030.0232 344.9172 Mitigated Construction Off-Site
CalEEMod Version: CalEEMod.2020.4.0 Page 19 of 29 Date: 9/29/2021 8:51 AM Rancho Descanso, DHS - Salton Sea Air Basin, Summer
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

3.6 Architectural Coating - 2022
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Archit. Coating 6.5846 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Off-Road 0.2045 1.4085 1.8136 2.9700e0030.0817 0.0817 0.0817 0.0817 281.4481 281.4481 0.0183 281.9062 Total 6.7891 1.4085 1.8136 2.9700e0030.0817 0.0817 0.0817 0.0817 281.4481 281.4481 0.0183 281.9062 Unmitigated Construction On-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 0.0236 0.0127 0.1952 4.0000e0040.0418 2.2000e0040.0421 0.0111 2.0000e0040.0113 40.7184 40.7184 1.2500e0031.1700e00341.0987 Total 0.0236 0.0127 0.1952 4.0000e0040.0418 2.2000e0040.0421 0.0111 2.0000e0040.0113 40.7184 40.7184 1.2500e0031.1700e00341.0987 Unmitigated Construction Off-Site
CalEEMod Version: CalEEMod.2020.4.0 Page 20 of 29 Date: 9/29/2021 8:51 AM Rancho Descanso, DHS - Salton Sea Air Basin, Summer
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

3.6 Architectural Coating - 2022
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Archit. Coating 6.5846 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Off-Road 0.2045 1.4085 1.8136 2.9700e0030.0817 0.0817 0.0817 0.0817 0.0000 281.4481 281.4481 0.0183 281.9062 Total 6.7891 1.4085 1.8136 2.9700e0030.0817 0.0817 0.0817 0.0817 0.0000 281.4481 281.4481 0.0183 281.9062 Mitigated Construction On-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 0.0236 0.0127 0.1952 4.0000e0040.0418 2.2000e0040.0421 0.0111 2.0000e0040.0113 40.7184 40.7184 1.2500e0031.1700e00341.0987 Total 0.0236 0.0127 0.1952 4.0000e0040.0418 2.2000e0040.0421 0.0111 2.0000e0040.0113 40.7184 40.7184 1.2500e0031.1700e00341.0987 Mitigated Construction Off-Site
CalEEMod Version: CalEEMod.2020.4.0 Page 21 of 29 Date: 9/29/2021 8:51 AM Rancho Descanso, DHS - Salton Sea Air Basin, Summer
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

3.6 Architectural Coating - 2023
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Archit. Coating 6.5846 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Off-Road 0.1917 1.3030 1.8111 2.9700e0030.0708 0.0708 0.0708 0.0708 281.4481 281.4481 0.0168 281.8690 Total 6.7762 1.3030 1.8111 2.9700e0030.0708 0.0708 0.0708 0.0708 281.4481 281.4481 0.0168 281.8690 Unmitigated Construction On-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 0.0219 0.0113 0.1784 3.9000e0040.0418 2.1000e0040.0420 0.0111 1.9000e0040.0113 39.6266 39.6266 1.1200e0031.0800e00339.9761 Total 0.0219 0.0113 0.1784 3.9000e0040.0418 2.1000e0040.0420 0.0111 1.9000e0040.0113 39.6266 39.6266 1.1200e0031.0800e00339.9761 Unmitigated Construction Off-Site
CalEEMod Version: CalEEMod.2020.4.0 Page 22 of 29 Date: 9/29/2021 8:51 AM Rancho Descanso, DHS - Salton Sea Air Basin, Summer
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

3.6 Architectural Coating - 2023
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Archit. Coating 6.5846 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Off-Road 0.1917 1.3030 1.8111 2.9700e0030.0708 0.0708 0.0708 0.0708 0.0000 281.4481 281.4481 0.0168 281.8690 Total 6.7762 1.3030 1.8111 2.9700e0030.0708 0.0708 0.0708 0.0708 0.0000 281.4481 281.4481 0.0168 281.8690 Mitigated Construction On-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 0.0219 0.0113 0.1784 3.9000e0040.0418 2.1000e0040.0420 0.0111 1.9000e0040.0113 39.6266 39.6266 1.1200e0031.0800e00339.9761 Total 0.0219 0.0113 0.1784 3.9000e0040.0418 2.1000e0040.0420 0.0111 1.9000e0040.0113 39.6266 39.6266 1.1200e0031.0800e00339.9761 Mitigated Construction Off-Site
CalEEMod Version: CalEEMod.2020.4.0 Page 23 of 29 Date: 9/29/2021 8:51 AM Rancho Descanso, DHS - Salton Sea Air Basin, Summer
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

4.0 Operational Detail - Mobile
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Mitigated 2.5597 2.3862 18.8721 0.0366 3.4251 0.0271 3.4523 0.9134 0.0254 0.9388 3,763.979 7 3,763.979
7 0.1971 0.1877 3,824.837
0 Unmitigated 2.5597 2.3862 18.8721 0.0366 3.4251 0.0271 3.4523 0.9134 0.0254 0.9388 3,763.979 7 3,763.979
7 0.1971 0.1877 3,824.837
0 4.1 Mitigation Measures Mobile

4.2 Trip Summary Information

4.3 Trip Type Information
Average Daily Trip Rate Unmitigated Mitigated
Land Use Weekday Saturday Sunday Annual VMT Annual VMT
Single Family Housing 717.44 725.04 649.80 1,585,670 1,585,670 Total 717.44 725.04 649.80 1,585,670 1,585,670
Miles Trip % Trip Purpose %
Land Use H-W or C-W H-S or C-C H-O or C-NW H-W or C-W H-S or C-C H-O or C-NW Primary Diverted Pass-by Single Family Housing 11.00 3.50 4.50 40.20 19.20 40.60 86 11 3

4.4 Fleet Mix
Land Use LDA LDT1 LDT2 MDV LHD1 LHD2 MHD HHD OBUS UBUS MCY SBUS MH Single Family Housing 0.515135 0.060169 0.185335 0.147842 0.025432 0.007034 0.010598 0.020349 0.000855 0.000237 0.021941 0.000925 0.004146 CalEEMod Version: CalEEMod.2020.4.0 Page 24 of 29 Date: 9/29/2021 8:51 AM Rancho Descanso, DHS - Salton Sea Air Basin, Summer
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

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

0.0635 0.5428 0.2310 3.4600e0030.0439 0.0439 0.0439 0.0439 692.9275 692.9275 0.0133 0.0127 697.0452 NaturalGas
Unmitigated

0.0635 0.5428 0.2310 3.4600e0030.0439 0.0439 0.0439 0.0439 692.9275 692.9275 0.0133 0.0127 697.0452

5.2 Energy by Land Use - NaturalGas
NaturalGa
s Use
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Land Use kBTU/yr lb/day lb/day
Single Family
Housing
5889.88 0.0635 0.5428 0.2310 3.4600e0030.0439 0.0439 0.0439 0.0439 692.9275 692.9275 0.0133 0.0127 697.0452 Total 0.0635 0.5428 0.2310 3.4600e0030.0439 0.0439 0.0439 0.0439 692.9275 692.9275 0.0133 0.0127 697.0452 Unmitigated

5.1 Mitigation Measures Energy
Historical Energy Use: N
CalEEMod Version: CalEEMod.2020.4.0 Page 25 of 29 Date: 9/29/2021 8:51 AM Rancho Descanso, DHS - Salton Sea Air Basin, Summer
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

6.1 Mitigation Measures Area

6.0 Area Detail
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Mitigated 3.6610 0.7171 6.5459 4.4500e0030.0869 0.0869 0.0869 0.0869 0.0000 834.5041 834.5041 0.0266 0.0151 839.6675 Unmitigated 3.6610 0.7171 6.5459 4.4500e0030.0869 0.0869 0.0869 0.0869 0.0000 834.5041 834.5041 0.0266 0.0151 839.6675

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

5.88988 0.0635 0.5428 0.2310 3.4600e0030.0439 0.0439 0.0439 0.0439 692.9275 692.9275 0.0133 0.0127 697.0452 Total 0.0635 0.5428 0.2310 3.4600e0030.0439 0.0439 0.0439 0.0439 692.9275 692.9275 0.0133 0.0127 697.0452 Mitigated
CalEEMod Version: CalEEMod.2020.4.0 Page 26 of 29 Date: 9/29/2021 8:51 AM Rancho Descanso, DHS - Salton Sea Air Basin, Summer
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

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

0.4690 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
Consumer
Products

2.9275 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
Hearth 0.0755 0.6449 0.2744 4.1200e0030.0521 0.0521 0.0521 0.0521 0.0000 823.2141 823.2141 0.0158 0.0151 828.1061 Landscaping 0.1889 0.0723 6.2715 3.3000e0040.0347 0.0347 0.0347 0.0347 11.2900 11.2900 0.0109 11.5614 Total 3.6610 0.7171 6.5459 4.4500e0030.0869 0.0869 0.0869 0.0869 0.0000 834.5041 834.5041 0.0266 0.0151 839.6675 Unmitigated
CalEEMod Version: CalEEMod.2020.4.0 Page 27 of 29 Date: 9/29/2021 8:51 AM Rancho Descanso, DHS - Salton Sea Air Basin, Summer
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

7.1 Mitigation Measures Water

7.0 Water Detail

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

0.4690 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
Consumer
Products

2.9275 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
Hearth 0.0755 0.6449 0.2744 4.1200e0030.0521 0.0521 0.0521 0.0521 0.0000 823.2141 823.2141 0.0158 0.0151 828.1061 Landscaping 0.1889 0.0723 6.2715 3.3000e0040.0347 0.0347 0.0347 0.0347 11.2900 11.2900 0.0109 11.5614 Total 3.6610 0.7171 6.5459 4.4500e0030.0869 0.0869 0.0869 0.0869 0.0000 834.5041 834.5041 0.0266 0.0151 839.6675 Mitigated
CalEEMod Version: CalEEMod.2020.4.0 Page 28 of 29 Date: 9/29/2021 8:51 AM Rancho Descanso, DHS - Salton Sea Air Basin, Summer
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

11.0 Vegetation

8.1 Mitigation Measures Waste

8.0 Waste Detail

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

10.0 Stationary Equipment
Fire Pumps and Emergency Generators
Equipment Type Number Hours/Day Hours/Year Horse Power Load Factor Fuel Type Boilers
Equipment Type Number Heat Input/Day Heat Input/Year Boiler Rating Fuel Type User Defined Equipment
Equipment Type Number
CalEEMod Version: CalEEMod.2020.4.0 Page 29 of 29 Date: 9/29/2021 8:51 AM Rancho Descanso, DHS - Salton Sea Air Basin, Summer
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

Rancho Descanso, DHS
Salton Sea Air Basin, Winter
Project Characteristics -
Land Use - 76 unit single family residential development.

Construction Phase - Assumes a 2 year buildout with operation in 2023. Assumes paving will occur simultaneously with building construction, and architectural coatings will be applied gradually over time as units are completed.

On-road Fugitive Dust - All roads in project area are paved.

Grading - Preliminary grading calcs = 8267 CY of import.

Road Dust - All roads paved.

Construction Off-road Equipment Mitigation - Standard dust control measures per SCAQMD Rule 403.1.

1.1 Land Usage
Land Uses Size Metric Lot Acreage Floor Surface Area Population Single Family Housing 76.00 Dwelling Unit 17.83 136,800.00 245

1.2 Other Project Characteristics
Urbanization
Climate Zone
Urban
15 Wind Speed (m/s) 3.4 Precipitation Freq (Days) 20

1.3 User Entered Comments & Non-Default Data

1.0 Project Characteristics
Utility Company Southern California Edison
Operational Year 2023
CO2 Intensity
(lb/MWhr)
390.98 CH4 Intensity 0.033
(lb/MWhr)
N2O Intensity 0.004
(lb/MWhr)
Table Name Column Name Default Value New Value
tblConstDustMitigation WaterUnpavedRoadMoistureContent 0 0.5 tblConstDustMitigation WaterUnpavedRoadVehicleSpeed 0 40 tblConstructionPhase NumDays 20.00 260.00
CalEEMod Version: CalEEMod.2020.4.0 Page 1 of 29 Date: 9/29/2021 8:48 AM Rancho Descanso, DHS - Salton Sea Air Basin, Winter
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

2.0 Emissions Summary
tblConstructionPhase NumDays 300.00 455.00
tblConstructionPhase NumDays 30.00 40.00
tblConstructionPhase NumDays 20.00 30.00
tblConstructionPhase NumDays 10.00 20.00
tblGrading AcresOfGrading 120.00 17.83
tblGrading AcresOfGrading 30.00 15.00
tblGrading MaterialImported 0.00 8,267.00
tblLandUse LotAcreage 24.68 17.83
tblOnRoadDust HaulingPercentPave 50.00 100.00
tblOnRoadDust HaulingPercentPave 50.00 100.00
tblOnRoadDust HaulingPercentPave 50.00 100.00
tblOnRoadDust HaulingPercentPave 50.00 100.00
tblOnRoadDust HaulingPercentPave 50.00 100.00
tblOnRoadDust VendorPercentPave 50.00 100.00
tblOnRoadDust VendorPercentPave 50.00 100.00
tblOnRoadDust VendorPercentPave 50.00 100.00
tblOnRoadDust VendorPercentPave 50.00 100.00
tblOnRoadDust VendorPercentPave 50.00 100.00
tblOnRoadDust WorkerPercentPave 50.00 100.00
tblOnRoadDust WorkerPercentPave 50.00 100.00
tblOnRoadDust WorkerPercentPave 50.00 100.00
tblOnRoadDust WorkerPercentPave 50.00 100.00
tblOnRoadDust WorkerPercentPave 50.00 100.00
tblRoadDust RoadPercentPave 50 100
CalEEMod Version: CalEEMod.2020.4.0 Page 2 of 29 Date: 9/29/2021 8:48 AM Rancho Descanso, DHS - Salton Sea Air Basin, Winter
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

2.1 Overall Construction (Maximum Daily Emission)
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Year lb/day lb/day
2021 4.3501 49.4586 32.1838 0.0753 19.0122 2.0453 21.0576 10.0565 1.8817 11.9382 0.0000 7,408.196 5 7,408.196
5 1.9574 0.2032 7,517.671
9 2022 8.6238 27.1536 32.2555 0.0538 0.3916 1.3823 1.7739 0.1048 1.2887 1.3935 0.0000 5,181.803 8 5,181.803
8 1.3374 0.0281 5,223.621
8 2023 8.4666 16.0129 19.0082 0.0332 0.3079 0.7737 1.0816 0.0826 0.7322 0.8148 0.0000 3,177.125 8 3,177.125
8 0.6328 0.0245 3,200.230
5 Maximum 8.6238 49.4586 32.2555 0.0753 19.0122 2.0453 21.0576 10.0565 1.8817 11.9382 0.0000 7,408.196 5 7,408.196
5 1.9574 0.2032 7,517.671
9 Unmitigated Construction
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Year lb/day lb/day
2021 4.3501 49.4586 32.1838 0.0753 7.1388 2.0453 9.1842 3.7511 1.8817 5.6328 0.0000 7,408.196 5 7,408.196
5 1.9574 0.2032 7,517.671
9 2022 8.6238 27.1536 32.2555 0.0538 0.3916 1.3823 1.7739 0.1048 1.2887 1.3935 0.0000 5,181.803 8 5,181.803
8 1.3374 0.0281 5,223.621
8 2023 8.4666 16.0129 19.0082 0.0332 0.3079 0.7737 1.0816 0.0826 0.7322 0.8148 0.0000 3,177.125 8 3,177.125
8 0.6328 0.0245 3,200.230
5 Maximum 8.6238 49.4586 32.2555 0.0753 7.1388 2.0453 9.1842 3.7511 1.8817 5.6328 0.0000 7,408.196 5 7,408.196
5 1.9574 0.2032 7,517.671
9 Mitigated Construction
CalEEMod Version: CalEEMod.2020.4.0 Page 3 of 29 Date: 9/29/2021 8:48 AM Rancho Descanso, DHS - Salton Sea Air Basin, Winter
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio-CO2 Total CO2 CH4 N20 CO2e
Percent
Reduction

0.00 0.00 0.00 0.00 60.24 0.00 49.65 61.55 0.00 44.57 0.00 0.00 0.00 0.00 0.00 0.00 CalEEMod Version: CalEEMod.2020.4.0 Page 4 of 29 Date: 9/29/2021 8:48 AM Rancho Descanso, DHS - Salton Sea Air Basin, Winter
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

2.2 Overall Operational
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Area 3.6610 0.7171 6.5459 4.4500e0030.0869 0.0869 0.0869 0.0869 0.0000 834.5041 834.5041 0.0266 0.0151 839.6675 Energy 0.0635 0.5428 0.2310 3.4600e0030.0439 0.0439 0.0439 0.0439 692.9275 692.9275 0.0133 0.0127 697.0452 Mobile 1.6661 2.5725 15.3977 0.0325 3.4251 0.0272 3.4523 0.9134 0.0254 0.9389 3,339.174 6 3,339.174
6 0.2075 0.1913 3,401.356
9 Total 5.3905 3.8324 22.1745 0.0404 3.4251 0.1579 3.5830 0.9134 0.1562 1.0696 0.0000 4,866.606 2 4,866.606
2 0.2474 0.2191 4,938.069
5 Unmitigated Operational
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Area 3.6610 0.7171 6.5459 4.4500e0030.0869 0.0869 0.0869 0.0869 0.0000 834.5041 834.5041 0.0266 0.0151 839.6675 Energy 0.0635 0.5428 0.2310 3.4600e0030.0439 0.0439 0.0439 0.0439 692.9275 692.9275 0.0133 0.0127 697.0452 Mobile 1.6661 2.5725 15.3977 0.0325 3.4251 0.0272 3.4523 0.9134 0.0254 0.9389 3,339.174 6 3,339.174
6 0.2075 0.1913 3,401.356
9 Total 5.3905 3.8324 22.1745 0.0404 3.4251 0.1579 3.5830 0.9134 0.1562 1.0696 0.0000 4,866.606 2 4,866.606
2 0.2474 0.2191 4,938.069
5 Mitigated Operational
CalEEMod Version: CalEEMod.2020.4.0 Page 5 of 29 Date: 9/29/2021 8:48 AM Rancho Descanso, DHS - Salton Sea Air Basin, Winter
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

3.0 Construction Detail
Construction Phase
Phase
Number
Phase Name Phase Type Start Date End Date Num Days
Week
Num Days Phase Description
1 Site Preparation Site Preparation 10/1/2021 10/28/2021 5 20 2 Grading Grading 10/29/2021 12/23/2021 5 40
3 Paving Paving 12/24/2021 2/3/2022 5 30
4 Building Construction Building Construction 1/1/2022 9/30/2023 5 455 5 Architectural Coating Architectural Coating 10/1/2022 4/28/2023 5 260 OffRoad Equipment
Phase Name Offroad Equipment Type Amount Usage Hours Horse Power Load Factor Site Preparation Rubber Tired Dozers 3 8.00 247 0.40
Site Preparation Tractors/Loaders/Backhoes 4 8.00 97 0.37 Grading Excavators 2 8.00 158 0.38
Grading Graders 1 8.00 187 0.41
Grading Rubber Tired Dozers 1 8.00 247 0.40
Grading Scrapers 2 8.00 367 0.48
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio-CO2 Total CO2 CH4 N20 CO2e
Percent
Reduction

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Residential Indoor: 277,020; Residential Outdoor: 92,340; Non-Residential Indoor: 0; Non-Residential Outdoor: 0; Striped Parking Area: 0 (Architectural Coating – sqft)
Acres of Grading (Site Preparation Phase): 15
Acres of Grading (Grading Phase): 17.83
Acres of Paving: 0
CalEEMod Version: CalEEMod.2020.4.0 Page 6 of 29 Date: 9/29/2021 8:48 AM Rancho Descanso, DHS - Salton Sea Air Basin, Winter
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

3.1 Mitigation Measures Construction
Use Soil Stabilizer
Replace Ground Cover
Water Exposed Area
Grading Tractors/Loaders/Backhoes 2 8.00 97 0.37
Building Construction Cranes 1 7.00 231 0.29
Building Construction Forklifts 3 8.00 89 0.20
Building Construction Generator Sets 1 8.00 84 0.74
Building Construction Tractors/Loaders/Backhoes 3 7.00 97 0.37 Building Construction Welders 1 8.00 46 0.45
Paving Pavers 2 8.00 130 0.42
Paving Paving Equipment 2 8.00 132 0.36
Paving Rollers 2 8.00 80 0.38
Architectural Coating Air Compressors 1 6.00 78 0.48
Trips and VMT
Phase Name Offroad Equipment
Count
Worker Trip
Number
Vendor Trip
Number
Hauling Trip
Number
Worker Trip
Length
Vendor Trip
Length
Hauling Trip
Length
Worker Vehicle
Class
Vendor
Vehicle Class
Hauling
Vehicle Class
Site Preparation 7 18.00 0.00 0.00 11.00 5.40 20.00 LD_Mix HDT_Mix HHDT Grading 8 20.00 0.00 817.00 11.00 5.40 20.00 LD_Mix HDT_Mix HHDT Building Construction 9 27.00 8.00 0.00 11.00 5.40 20.00 LD_Mix HDT_Mix HHDT Paving 6 15.00 0.00 0.00 11.00 5.40 20.00 LD_Mix HDT_Mix HHDT Architectural Coating 1 5.00 0.00 0.00 11.00 5.40 20.00 LD_Mix HDT_Mix HHDT CalEEMod Version: CalEEMod.2020.4.0 Page 7 of 29 Date: 9/29/2021 8:48 AM Rancho Descanso, DHS - Salton Sea Air Basin, Winter
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

3.2 Site Preparation - 2021
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Fugitive Dust 18.8616 0.0000 18.8616 10.0166 0.0000 10.0166 0.0000 0.0000 Off-Road 3.8882 40.4971 21.1543 0.0380 2.0445 2.0445 1.8809 1.8809 3,685.656 9 3,685.656
9 1.1920 3,715.457
3 Total 3.8882 40.4971 21.1543 0.0380 18.8616 2.0445 20.9061 10.0166 1.8809 11.8975 3,685.656 9 3,685.656
9 1.1920 3,715.457
3 Unmitigated Construction On-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 0.0698 0.0536 0.5478 1.2700e0030.1506 8.5000e0040.1515 0.0400 7.9000e0040.0407 128.3378 128.3378 4.9700e0034.6600e003129.8504 Total 0.0698 0.0536 0.5478 1.2700e0030.1506 8.5000e0040.1515 0.0400 7.9000e0040.0407 128.3378 128.3378 4.9700e0034.6600e003129.8504 Unmitigated Construction Off-Site
CalEEMod Version: CalEEMod.2020.4.0 Page 8 of 29 Date: 9/29/2021 8:48 AM Rancho Descanso, DHS - Salton Sea Air Basin, Winter
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

3.2 Site Preparation - 2021
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Fugitive Dust 6.9882 0.0000 6.9882 3.7111 0.0000 3.7111 0.0000 0.0000 Off-Road 3.8882 40.4971 21.1543 0.0380 2.0445 2.0445 1.8809 1.8809 0.0000 3,685.656 9 3,685.656
9 1.1920 3,715.457
3 Total 3.8882 40.4971 21.1543 0.0380 6.9882 2.0445 9.0327 3.7111 1.8809 5.5920 0.0000 3,685.656 9 3,685.656
9 1.1920 3,715.457
3 Mitigated Construction On-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 0.0698 0.0536 0.5478 1.2700e0030.1506 8.5000e0040.1515 0.0400 7.9000e0040.0407 128.3378 128.3378 4.9700e0034.6600e003129.8504 Total 0.0698 0.0536 0.5478 1.2700e0030.1506 8.5000e0040.1515 0.0400 7.9000e0040.0407 128.3378 128.3378 4.9700e0034.6600e003129.8504 Mitigated Construction Off-Site
CalEEMod Version: CalEEMod.2020.4.0 Page 9 of 29 Date: 9/29/2021 8:48 AM Rancho Descanso, DHS - Salton Sea Air Basin, Winter
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

3.3 Grading - 2021
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Fugitive Dust 6.4948 0.0000 6.4948 3.3613 0.0000 3.3613 0.0000 0.0000 Off-Road 4.1912 46.3998 30.8785 0.0620 1.9853 1.9853 1.8265 1.8265 6,007.043 4 6,007.043
4 1.9428 6,055.613
4 Total 4.1912 46.3998 30.8785 0.0620 6.4948 1.9853 8.4801 3.3613 1.8265 5.1878 6,007.043 4 6,007.043
4 1.9428 6,055.613
4 Unmitigated Construction On-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Hauling 0.0814 2.9992 0.6967 0.0119 0.3583 0.0452 0.4035 0.0983 0.0433 0.1416 1,258.555 5 1,258.555
5 9.1200e0030.1980 1,317.780
2 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 0.0776 0.0596 0.6086 1.4100e0030.1673 9.5000e0040.1683 0.0444 8.7000e0040.0453 142.5975 142.5975 5.5200e0035.1800e003144.2783 Total 0.1590 3.0588 1.3054 0.0133 0.5256 0.0462 0.5718 0.1427 0.0441 0.1868 1,401.153 1 1,401.153
1 0.0146 0.2032 1,462.058
4 Unmitigated Construction Off-Site
CalEEMod Version: CalEEMod.2020.4.0 Page 10 of 29 Date: 9/29/2021 8:48 AM Rancho Descanso, DHS - Salton Sea Air Basin, Winter
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

3.3 Grading - 2021
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Fugitive Dust 2.4063 0.0000 2.4063 1.2454 0.0000 1.2454 0.0000 0.0000 Off-Road 4.1912 46.3998 30.8785 0.0620 1.9853 1.9853 1.8265 1.8265 0.0000 6,007.043 4 6,007.043
4 1.9428 6,055.613
4 Total 4.1912 46.3998 30.8785 0.0620 2.4063 1.9853 4.3917 1.2454 1.8265 3.0719 0.0000 6,007.043 4 6,007.043
4 1.9428 6,055.613
4 Mitigated Construction On-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Hauling 0.0814 2.9992 0.6967 0.0119 0.3583 0.0452 0.4035 0.0983 0.0433 0.1416 1,258.555 5 1,258.555
5 9.1200e0030.1980 1,317.780
2 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 0.0776 0.0596 0.6086 1.4100e0030.1673 9.5000e0040.1683 0.0444 8.7000e0040.0453 142.5975 142.5975 5.5200e0035.1800e003144.2783 Total 0.1590 3.0588 1.3054 0.0133 0.5256 0.0462 0.5718 0.1427 0.0441 0.1868 1,401.153 1 1,401.153
1 0.0146 0.2032 1,462.058
4 Mitigated Construction Off-Site
CalEEMod Version: CalEEMod.2020.4.0 Page 11 of 29 Date: 9/29/2021 8:48 AM Rancho Descanso, DHS - Salton Sea Air Basin, Winter
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

3.4 Paving - 2021
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Off-Road 1.2556 12.9191 14.6532 0.0228 0.6777 0.6777 0.6235 0.6235 2,207.210 9 2,207.210
9 0.7139 2,225.057
3 Paving 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Total 1.2556 12.9191 14.6532 0.0228 0.6777 0.6777 0.6235 0.6235 2,207.210 9 2,207.210
9 0.7139 2,225.057
3 Unmitigated Construction On-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 0.0582 0.0447 0.4565 1.0600e0030.1255 7.1000e0040.1262 0.0333 6.6000e0040.0339 106.9482 106.9482 4.1400e0033.8800e003108.2087 Total 0.0582 0.0447 0.4565 1.0600e0030.1255 7.1000e0040.1262 0.0333 6.6000e0040.0339 106.9482 106.9482 4.1400e0033.8800e003108.2087 Unmitigated Construction Off-Site
CalEEMod Version: CalEEMod.2020.4.0 Page 12 of 29 Date: 9/29/2021 8:48 AM Rancho Descanso, DHS - Salton Sea Air Basin, Winter
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

3.4 Paving - 2021
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Off-Road 1.2556 12.9191 14.6532 0.0228 0.6777 0.6777 0.6235 0.6235 0.0000 2,207.210 9 2,207.210
9 0.7139 2,225.057
3 Paving 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Total 1.2556 12.9191 14.6532 0.0228 0.6777 0.6777 0.6235 0.6235 0.0000 2,207.210 9 2,207.210
9 0.7139 2,225.057
3 Mitigated Construction On-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 0.0582 0.0447 0.4565 1.0600e0030.1255 7.1000e0040.1262 0.0333 6.6000e0040.0339 106.9482 106.9482 4.1400e0033.8800e003108.2087 Total 0.0582 0.0447 0.4565 1.0600e0030.1255 7.1000e0040.1262 0.0333 6.6000e0040.0339 106.9482 106.9482 4.1400e0033.8800e003108.2087 Mitigated Construction Off-Site
CalEEMod Version: CalEEMod.2020.4.0 Page 13 of 29 Date: 9/29/2021 8:48 AM Rancho Descanso, DHS - Salton Sea Air Basin, Winter
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

3.4 Paving - 2022
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Off-Road 1.1028 11.1249 14.5805 0.0228 0.5679 0.5679 0.5225 0.5225 2,207.660 3 2,207.660
3 0.7140 2,225.510
4 Paving 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Total 1.1028 11.1249 14.5805 0.0228 0.5679 0.5679 0.5225 0.5225 2,207.660 3 2,207.660
3 0.7140 2,225.510
4 Unmitigated Construction On-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 0.0539 0.0393 0.4165 1.0200e0030.1255 6.6000e0040.1262 0.0333 6.1000e0040.0339 104.0654 104.0654 3.7300e0033.5600e003105.2192 Total 0.0539 0.0393 0.4165 1.0200e0030.1255 6.6000e0040.1262 0.0333 6.1000e0040.0339 104.0654 104.0654 3.7300e0033.5600e003105.2192 Unmitigated Construction Off-Site
CalEEMod Version: CalEEMod.2020.4.0 Page 14 of 29 Date: 9/29/2021 8:48 AM Rancho Descanso, DHS - Salton Sea Air Basin, Winter
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

3.4 Paving - 2022
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Off-Road 1.1028 11.1249 14.5805 0.0228 0.5679 0.5679 0.5225 0.5225 0.0000 2,207.660 3 2,207.660
3 0.7140 2,225.510
4 Paving 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Total 1.1028 11.1249 14.5805 0.0228 0.5679 0.5679 0.5225 0.5225 0.0000 2,207.660 3 2,207.660
3 0.7140 2,225.510
4 Mitigated Construction On-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 0.0539 0.0393 0.4165 1.0200e0030.1255 6.6000e0040.1262 0.0333 6.1000e0040.0339 104.0654 104.0654 3.7300e0033.5600e003105.2192 Total 0.0539 0.0393 0.4165 1.0200e0030.1255 6.6000e0040.1262 0.0333 6.1000e0040.0339 104.0654 104.0654 3.7300e0033.5600e003105.2192 Mitigated Construction Off-Site
CalEEMod Version: CalEEMod.2020.4.0 Page 15 of 29 Date: 9/29/2021 8:48 AM Rancho Descanso, DHS - Salton Sea Air Basin, Winter
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

3.5 Building Construction - 2022
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Off-Road 1.7062 15.6156 16.3634 0.0269 0.8090 0.8090 0.7612 0.7612 2,554.333 6 2,554.333
6 0.6120 2,569.632
2 Total 1.7062 15.6156 16.3634 0.0269 0.8090 0.8090 0.7612 0.7612 2,554.333 6 2,554.333
6 0.6120 2,569.632
2 Unmitigated Construction On-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0135 0.3031 0.1453 1.2200e0030.0402 3.4900e0030.0437 0.0116 3.3400e0030.0149 128.4268 128.4268 1.0500e0030.0182 133.8654 Worker 0.0970 0.0707 0.7497 1.8400e0030.2259 1.1900e0030.2271 0.0599 1.1000e0030.0610 187.3177 187.3177 6.7100e0036.4100e003189.3946 Total 0.1105 0.3738 0.8951 3.0600e0030.2661 4.6800e0030.2708 0.0715 4.4400e0030.0759 315.7445 315.7445 7.7600e0030.0246 323.2600 Unmitigated Construction Off-Site
CalEEMod Version: CalEEMod.2020.4.0 Page 16 of 29 Date: 9/29/2021 8:48 AM Rancho Descanso, DHS - Salton Sea Air Basin, Winter
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

3.5 Building Construction - 2022
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Off-Road 1.7062 15.6156 16.3634 0.0269 0.8090 0.8090 0.7612 0.7612 0.0000 2,554.333 6 2,554.333
6 0.6120 2,569.632
2 Total 1.7062 15.6156 16.3634 0.0269 0.8090 0.8090 0.7612 0.7612 0.0000 2,554.333 6 2,554.333
6 0.6120 2,569.632
2 Mitigated Construction On-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0135 0.3031 0.1453 1.2200e0030.0402 3.4900e0030.0437 0.0116 3.3400e0030.0149 128.4268 128.4268 1.0500e0030.0182 133.8654 Worker 0.0970 0.0707 0.7497 1.8400e0030.2259 1.1900e0030.2271 0.0599 1.1000e0030.0610 187.3177 187.3177 6.7100e0036.4100e003189.3946 Total 0.1105 0.3738 0.8951 3.0600e0030.2661 4.6800e0030.2708 0.0715 4.4400e0030.0759 315.7445 315.7445 7.7600e0030.0246 323.2600 Mitigated Construction Off-Site
CalEEMod Version: CalEEMod.2020.4.0 Page 17 of 29 Date: 9/29/2021 8:48 AM Rancho Descanso, DHS - Salton Sea Air Basin, Winter
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

3.5 Building Construction - 2023
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Off-Road 1.5728 14.3849 16.2440 0.0269 0.6997 0.6997 0.6584 0.6584 2,555.209 9 2,555.209
9 0.6079 2,570.406
1 Total 1.5728 14.3849 16.2440 0.0269 0.6997 0.6997 0.6584 0.6584 2,555.209 9 2,555.209
9 0.6079 2,570.406
1 Unmitigated Construction On-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0109 0.2511 0.1383 1.1800e0030.0402 1.8000e0030.0420 0.0116 1.7200e0030.0133 124.3021 124.3021 9.3000e0040.0175 129.5283 Worker 0.0901 0.0624 0.6875 1.7800e0030.2259 1.1200e0030.2270 0.0599 1.0300e0030.0610 182.3899 182.3899 6.0500e0035.9000e003184.2979 Total 0.1009 0.3135 0.8258 2.9600e0030.2661 2.9200e0030.2690 0.0715 2.7500e0030.0743 306.6920 306.6920 6.9800e0030.0234 313.8262 Unmitigated Construction Off-Site
CalEEMod Version: CalEEMod.2020.4.0 Page 18 of 29 Date: 9/29/2021 8:48 AM Rancho Descanso, DHS - Salton Sea Air Basin, Winter
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

3.5 Building Construction - 2023
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Off-Road 1.5728 14.3849 16.2440 0.0269 0.6997 0.6997 0.6584 0.6584 0.0000 2,555.209 9 2,555.209
9 0.6079 2,570.406
1 Total 1.5728 14.3849 16.2440 0.0269 0.6997 0.6997 0.6584 0.6584 0.0000 2,555.209 9 2,555.209
9 0.6079 2,570.406
1 Mitigated Construction On-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0109 0.2511 0.1383 1.1800e0030.0402 1.8000e0030.0420 0.0116 1.7200e0030.0133 124.3021 124.3021 9.3000e0040.0175 129.5283 Worker 0.0901 0.0624 0.6875 1.7800e0030.2259 1.1200e0030.2270 0.0599 1.0300e0030.0610 182.3899 182.3899 6.0500e0035.9000e003184.2979 Total 0.1009 0.3135 0.8258 2.9600e0030.2661 2.9200e0030.2690 0.0715 2.7500e0030.0743 306.6920 306.6920 6.9800e0030.0234 313.8262 Mitigated Construction Off-Site
CalEEMod Version: CalEEMod.2020.4.0 Page 19 of 29 Date: 9/29/2021 8:48 AM Rancho Descanso, DHS - Salton Sea Air Basin, Winter
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

3.6 Architectural Coating - 2022
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Archit. Coating 6.5846 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Off-Road 0.2045 1.4085 1.8136 2.9700e0030.0817 0.0817 0.0817 0.0817 281.4481 281.4481 0.0183 281.9062 Total 6.7891 1.4085 1.8136 2.9700e0030.0817 0.0817 0.0817 0.0817 281.4481 281.4481 0.0183 281.9062 Unmitigated Construction On-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 0.0180 0.0131 0.1388 3.4000e0040.0418 2.2000e0040.0421 0.0111 2.0000e0040.0113 34.6885 34.6885 1.2400e0031.1900e00335.0731 Total 0.0180 0.0131 0.1388 3.4000e0040.0418 2.2000e0040.0421 0.0111 2.0000e0040.0113 34.6885 34.6885 1.2400e0031.1900e00335.0731 Unmitigated Construction Off-Site
CalEEMod Version: CalEEMod.2020.4.0 Page 20 of 29 Date: 9/29/2021 8:48 AM Rancho Descanso, DHS - Salton Sea Air Basin, Winter
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

3.6 Architectural Coating - 2022
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Archit. Coating 6.5846 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Off-Road 0.2045 1.4085 1.8136 2.9700e0030.0817 0.0817 0.0817 0.0817 0.0000 281.4481 281.4481 0.0183 281.9062 Total 6.7891 1.4085 1.8136 2.9700e0030.0817 0.0817 0.0817 0.0817 0.0000 281.4481 281.4481 0.0183 281.9062 Mitigated Construction On-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 0.0180 0.0131 0.1388 3.4000e0040.0418 2.2000e0040.0421 0.0111 2.0000e0040.0113 34.6885 34.6885 1.2400e0031.1900e00335.0731 Total 0.0180 0.0131 0.1388 3.4000e0040.0418 2.2000e0040.0421 0.0111 2.0000e0040.0113 34.6885 34.6885 1.2400e0031.1900e00335.0731 Mitigated Construction Off-Site
CalEEMod Version: CalEEMod.2020.4.0 Page 21 of 29 Date: 9/29/2021 8:48 AM Rancho Descanso, DHS - Salton Sea Air Basin, Winter
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

3.6 Architectural Coating - 2023
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Archit. Coating 6.5846 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Off-Road 0.1917 1.3030 1.8111 2.9700e0030.0708 0.0708 0.0708 0.0708 281.4481 281.4481 0.0168 281.8690 Total 6.7762 1.3030 1.8111 2.9700e0030.0708 0.0708 0.0708 0.0708 281.4481 281.4481 0.0168 281.8690 Unmitigated Construction On-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 0.0167 0.0116 0.1273 3.3000e0040.0418 2.1000e0040.0420 0.0111 1.9000e0040.0113 33.7759 33.7759 1.1200e0031.0900e00334.1292 Total 0.0167 0.0116 0.1273 3.3000e0040.0418 2.1000e0040.0420 0.0111 1.9000e0040.0113 33.7759 33.7759 1.1200e0031.0900e00334.1292 Unmitigated Construction Off-Site
CalEEMod Version: CalEEMod.2020.4.0 Page 22 of 29 Date: 9/29/2021 8:48 AM Rancho Descanso, DHS - Salton Sea Air Basin, Winter
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

3.6 Architectural Coating - 2023
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Archit. Coating 6.5846 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Off-Road 0.1917 1.3030 1.8111 2.9700e0030.0708 0.0708 0.0708 0.0708 0.0000 281.4481 281.4481 0.0168 281.8690 Total 6.7762 1.3030 1.8111 2.9700e0030.0708 0.0708 0.0708 0.0708 0.0000 281.4481 281.4481 0.0168 281.8690 Mitigated Construction On-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 0.0167 0.0116 0.1273 3.3000e0040.0418 2.1000e0040.0420 0.0111 1.9000e0040.0113 33.7759 33.7759 1.1200e0031.0900e00334.1292 Total 0.0167 0.0116 0.1273 3.3000e0040.0418 2.1000e0040.0420 0.0111 1.9000e0040.0113 33.7759 33.7759 1.1200e0031.0900e00334.1292 Mitigated Construction Off-Site
CalEEMod Version: CalEEMod.2020.4.0 Page 23 of 29 Date: 9/29/2021 8:48 AM Rancho Descanso, DHS - Salton Sea Air Basin, Winter
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

4.0 Operational Detail - Mobile
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Mitigated 1.6661 2.5725 15.3977 0.0325 3.4251 0.0272 3.4523 0.9134 0.0254 0.9389 3,339.174 6 3,339.174
6 0.2075 0.1913 3,401.356
9 Unmitigated 1.6661 2.5725 15.3977 0.0325 3.4251 0.0272 3.4523 0.9134 0.0254 0.9389 3,339.174 6 3,339.174
6 0.2075 0.1913 3,401.356
9 4.1 Mitigation Measures Mobile

4.2 Trip Summary Information

4.3 Trip Type Information
Average Daily Trip Rate Unmitigated Mitigated
Land Use Weekday Saturday Sunday Annual VMT Annual VMT
Single Family Housing 717.44 725.04 649.80 1,585,670 1,585,670 Total 717.44 725.04 649.80 1,585,670 1,585,670
Miles Trip % Trip Purpose %
Land Use H-W or C-W H-S or C-C H-O or C-NW H-W or C-W H-S or C-C H-O or C-NW Primary Diverted Pass-by Single Family Housing 11.00 3.50 4.50 40.20 19.20 40.60 86 11 3

4.4 Fleet Mix
Land Use LDA LDT1 LDT2 MDV LHD1 LHD2 MHD HHD OBUS UBUS MCY SBUS MH Single Family Housing 0.515135 0.060169 0.185335 0.147842 0.025432 0.007034 0.010598 0.020349 0.000855 0.000237 0.021941 0.000925 0.004146 CalEEMod Version: CalEEMod.2020.4.0 Page 24 of 29 Date: 9/29/2021 8:48 AM Rancho Descanso, DHS - Salton Sea Air Basin, Winter
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

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

0.0635 0.5428 0.2310 3.4600e0030.0439 0.0439 0.0439 0.0439 692.9275 692.9275 0.0133 0.0127 697.0452 NaturalGas
Unmitigated

0.0635 0.5428 0.2310 3.4600e0030.0439 0.0439 0.0439 0.0439 692.9275 692.9275 0.0133 0.0127 697.0452

5.2 Energy by Land Use - NaturalGas
NaturalGa
s Use
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Land Use kBTU/yr lb/day lb/day
Single Family
Housing
5889.88 0.0635 0.5428 0.2310 3.4600e0030.0439 0.0439 0.0439 0.0439 692.9275 692.9275 0.0133 0.0127 697.0452 Total 0.0635 0.5428 0.2310 3.4600e0030.0439 0.0439 0.0439 0.0439 692.9275 692.9275 0.0133 0.0127 697.0452 Unmitigated

5.1 Mitigation Measures Energy
Historical Energy Use: N
CalEEMod Version: CalEEMod.2020.4.0 Page 25 of 29 Date: 9/29/2021 8:48 AM Rancho Descanso, DHS - Salton Sea Air Basin, Winter
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

6.1 Mitigation Measures Area

6.0 Area Detail
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category lb/day lb/day
Mitigated 3.6610 0.7171 6.5459 4.4500e0030.0869 0.0869 0.0869 0.0869 0.0000 834.5041 834.5041 0.0266 0.0151 839.6675 Unmitigated 3.6610 0.7171 6.5459 4.4500e0030.0869 0.0869 0.0869 0.0869 0.0000 834.5041 834.5041 0.0266 0.0151 839.6675

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

5.88988 0.0635 0.5428 0.2310 3.4600e0030.0439 0.0439 0.0439 0.0439 692.9275 692.9275 0.0133 0.0127 697.0452 Total 0.0635 0.5428 0.2310 3.4600e0030.0439 0.0439 0.0439 0.0439 692.9275 692.9275 0.0133 0.0127 697.0452 Mitigated
CalEEMod Version: CalEEMod.2020.4.0 Page 26 of 29 Date: 9/29/2021 8:48 AM Rancho Descanso, DHS - Salton Sea Air Basin, Winter
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

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

0.4690 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
Consumer
Products

2.9275 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
Hearth 0.0755 0.6449 0.2744 4.1200e0030.0521 0.0521 0.0521 0.0521 0.0000 823.2141 823.2141 0.0158 0.0151 828.1061 Landscaping 0.1889 0.0723 6.2715 3.3000e0040.0347 0.0347 0.0347 0.0347 11.2900 11.2900 0.0109 11.5614 Total 3.6610 0.7171 6.5459 4.4500e0030.0869 0.0869 0.0869 0.0869 0.0000 834.5041 834.5041 0.0266 0.0151 839.6675 Unmitigated
CalEEMod Version: CalEEMod.2020.4.0 Page 27 of 29 Date: 9/29/2021 8:48 AM Rancho Descanso, DHS - Salton Sea Air Basin, Winter
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

7.1 Mitigation Measures Water

7.0 Water Detail

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

0.4690 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
Consumer
Products

2.9275 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
Hearth 0.0755 0.6449 0.2744 4.1200e0030.0521 0.0521 0.0521 0.0521 0.0000 823.2141 823.2141 0.0158 0.0151 828.1061 Landscaping 0.1889 0.0723 6.2715 3.3000e0040.0347 0.0347 0.0347 0.0347 11.2900 11.2900 0.0109 11.5614 Total 3.6610 0.7171 6.5459 4.4500e0030.0869 0.0869 0.0869 0.0869 0.0000 834.5041 834.5041 0.0266 0.0151 839.6675 Mitigated
CalEEMod Version: CalEEMod.2020.4.0 Page 28 of 29 Date: 9/29/2021 8:48 AM Rancho Descanso, DHS - Salton Sea Air Basin, Winter
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

11.0 Vegetation

8.1 Mitigation Measures Waste

8.0 Waste Detail

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

10.0 Stationary Equipment
Fire Pumps and Emergency Generators
Equipment Type Number Hours/Day Hours/Year Horse Power Load Factor Fuel Type Boilers
Equipment Type Number Heat Input/Day Heat Input/Year Boiler Rating Fuel Type User Defined Equipment
Equipment Type Number
CalEEMod Version: CalEEMod.2020.4.0 Page 29 of 29 Date: 9/29/2021 8:48 AM Rancho Descanso, DHS - Salton Sea Air Basin, Winter
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

Rancho Descanso, DHS
Salton Sea Air Basin, Annual
Project Characteristics -
Land Use - 76 unit single family residential development.

Construction Phase - Assumes a 2 year buildout with operation in 2023. Assumes paving will occur simultaneously with building construction, and architectural coatings will be applied gradually over time as units are completed.

On-road Fugitive Dust - All roads in project area are paved.

Grading - Preliminary grading calcs = 8267 CY of import.

Road Dust - All roads paved.

Construction Off-road Equipment Mitigation - Standard dust control measures per SCAQMD Rule 403.1.

1.1 Land Usage
Land Uses Size Metric Lot Acreage Floor Surface Area Population Single Family Housing 76.00 Dwelling Unit 17.83 136,800.00 245

1.2 Other Project Characteristics
Urbanization
Climate Zone
Urban
15 Wind Speed (m/s) 3.4 Precipitation Freq (Days) 20

1.3 User Entered Comments & Non-Default Data

1.0 Project Characteristics
Utility Company Southern California Edison
Operational Year 2023
CO2 Intensity
(lb/MWhr)
390.98 CH4 Intensity 0.033
(lb/MWhr)
N2O Intensity 0.004
(lb/MWhr)
Table Name Column Name Default Value New Value
tblConstDustMitigation WaterUnpavedRoadMoistureContent 0 0.5 tblConstDustMitigation WaterUnpavedRoadVehicleSpeed 0 40 tblConstructionPhase NumDays 20.00 260.00
CalEEMod Version: CalEEMod.2020.4.0 Page 1 of 34 Date: 9/29/2021 8:53 AM Rancho Descanso, DHS - Salton Sea Air Basin, Annual
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

2.0 Emissions Summary
tblConstructionPhase NumDays 300.00 455.00
tblConstructionPhase NumDays 30.00 40.00
tblConstructionPhase NumDays 20.00 30.00
tblConstructionPhase NumDays 10.00 20.00
tblGrading AcresOfGrading 120.00 17.83
tblGrading AcresOfGrading 30.00 15.00
tblGrading MaterialImported 0.00 8,267.00
tblLandUse LotAcreage 24.68 17.83
tblOnRoadDust HaulingPercentPave 50.00 100.00
tblOnRoadDust HaulingPercentPave 50.00 100.00
tblOnRoadDust HaulingPercentPave 50.00 100.00
tblOnRoadDust HaulingPercentPave 50.00 100.00
tblOnRoadDust HaulingPercentPave 50.00 100.00
tblOnRoadDust VendorPercentPave 50.00 100.00
tblOnRoadDust VendorPercentPave 50.00 100.00
tblOnRoadDust VendorPercentPave 50.00 100.00
tblOnRoadDust VendorPercentPave 50.00 100.00
tblOnRoadDust VendorPercentPave 50.00 100.00
tblOnRoadDust WorkerPercentPave 50.00 100.00
tblOnRoadDust WorkerPercentPave 50.00 100.00
tblOnRoadDust WorkerPercentPave 50.00 100.00
tblOnRoadDust WorkerPercentPave 50.00 100.00
tblOnRoadDust WorkerPercentPave 50.00 100.00
tblRoadDust RoadPercentPave 50 100
CalEEMod Version: CalEEMod.2020.4.0 Page 2 of 34 Date: 9/29/2021 8:53 AM Rancho Descanso, DHS - Salton Sea Air Basin, Annual
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

2.1 Overall Construction
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Year tons/yr MT/yr
2021 0.1307 1.4325 0.9082 1.9700e0030.3308 0.0631 0.3939 0.1707 0.0581 0.2288 0.0000 175.5825 175.5825 0.0483 3.7300e003177.9035 2022 0.4722 2.2577 2.4996 4.3100e0030.0370 0.1153 0.1523 9.9500e0030.1085 0.1184 0.0000 374.6446 374.6446 0.0815 2.9500e003377.5609 2023 0.4525 1.4881 1.7551 3.0700e0030.0274 0.0715 0.0989 7.3600e0030.0675 0.0749 0.0000 266.4818 266.4818 0.0551 2.0900e003268.4821 Maximum 0.4722 2.2577 2.4996 4.3100e0030.3308 0.1153 0.3939 0.1707 0.1085 0.2288 0.0000 374.6446 374.6446 0.0815 3.7300e003377.5609 Unmitigated Construction
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Year tons/yr MT/yr
2021 0.1307 1.4325 0.9082 1.9700e0030.1303 0.0631 0.1934 0.0653 0.0581 0.1234 0.0000 175.5823 175.5823 0.0483 3.7300e003177.9033 2022 0.4722 2.2577 2.4996 4.3100e0030.0370 0.1153 0.1523 9.9500e0030.1085 0.1184 0.0000 374.6442 374.6442 0.0815 2.9500e003377.5605 2023 0.4525 1.4881 1.7551 3.0700e0030.0274 0.0715 0.0989 7.3600e0030.0675 0.0749 0.0000 266.4815 266.4815 0.0551 2.0900e003268.4818 Maximum 0.4722 2.2577 2.4996 4.3100e0030.1303 0.1153 0.1934 0.0653 0.1085 0.1234 0.0000 374.6442 374.6442 0.0815 3.7300e003377.5605 Mitigated Construction
CalEEMod Version: CalEEMod.2020.4.0 Page 3 of 34 Date: 9/29/2021 8:53 AM Rancho Descanso, DHS - Salton Sea Air Basin, Annual
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio-CO2 Total CO2 CH4 N20 CO2e
Percent
Reduction

0.00 0.00 0.00 0.00 50.74 0.00 31.08 56.04 0.00 24.97 0.00 0.00 0.00 0.00 0.00 0.00 Quarter Start Date End Date Maximum Unmitigated ROG + NOX (tons/quarter) Maximum Mitigated ROG + NOX (tons/quarter) 1 9-9-2021 12-8-2021 1.2330 1.2330
2 12-9-2021 3-8-2022 0.9047 0.9047
3 3-9-2022 6-8-2022 0.5852 0.5852
4 6-9-2022 9-8-2022 0.5853 0.5853
5 9-9-2022 12-8-2022 0.7815 0.7815
6 12-9-2022 3-8-2023 0.7996 0.7996
7 3-9-2023 6-8-2023 0.6858 0.6858
8 6-9-2023 9-8-2023 0.5382 0.5382
9 9-9-2023 9-30-2023 0.1287 0.1287
Highest 1.2330 1.2330
CalEEMod Version: CalEEMod.2020.4.0 Page 4 of 34 Date: 9/29/2021 8:53 AM Rancho Descanso, DHS - Salton Sea Air Basin, Annual
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

2.2 Overall Operational
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category tons/yr MT/yr
Area 0.6370 7.8900e0030.5650 4.0000e0053.2400e0033.2400e0033.2400e0033.2400e0030.0000 2.5274 2.5274 9.2000e0043.0000e0052.5591 Energy 0.0116 0.0991 0.0422 6.3000e0048.0100e0038.0100e0038.0100e0038.0100e0030.0000 222.0717 222.0717 0.0113 3.2000e003223.3072 Mobile 0.3475 0.4434 2.8537 6.0700e0030.6023 4.8300e0030.6071 0.1608 4.5200e0030.1653 0.0000 565.7844 565.7844 0.0318 0.0303 575.6192 Waste 0.0000 0.0000 0.0000 0.0000 20.3904 0.0000 20.3904 1.2050 0.0000 50.5165 Water 0.0000 0.0000 0.0000 0.0000 1.5710 17.5853 19.1563 0.1628 3.9900e00324.4161 Total 0.9961 0.5504 3.4609 6.7400e0030.6023 0.0161 0.6184 0.1608 0.0158 0.1765 21.9614 807.9688 829.9302 1.4118 0.0376 876.4181 Unmitigated Operational
CalEEMod Version: CalEEMod.2020.4.0 Page 5 of 34 Date: 9/29/2021 8:53 AM Rancho Descanso, DHS - Salton Sea Air Basin, Annual
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

2.2 Overall Operational
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category tons/yr MT/yr
Area 0.6370 7.8900e0030.5650 4.0000e0053.2400e0033.2400e0033.2400e0033.2400e0030.0000 2.5274 2.5274 9.2000e0043.0000e0052.5591 Energy 0.0116 0.0991 0.0422 6.3000e0048.0100e0038.0100e0038.0100e0038.0100e0030.0000 222.0717 222.0717 0.0113 3.2000e003223.3072 Mobile 0.3475 0.4434 2.8537 6.0700e0030.6023 4.8300e0030.6071 0.1608 4.5200e0030.1653 0.0000 565.7844 565.7844 0.0318 0.0303 575.6192 Waste 0.0000 0.0000 0.0000 0.0000 20.3904 0.0000 20.3904 1.2050 0.0000 50.5165 Water 0.0000 0.0000 0.0000 0.0000 1.5710 17.5853 19.1563 0.1628 3.9900e00324.4161 Total 0.9961 0.5504 3.4609 6.7400e0030.6023 0.0161 0.6184 0.1608 0.0158 0.1765 21.9614 807.9688 829.9302 1.4118 0.0376 876.4181 Mitigated Operational

3.0 Construction Detail
Construction Phase
Phase
Number
Phase Name Phase Type Start Date End Date Num Days
Week
Num Days Phase Description
1 Site Preparation Site Preparation 10/1/2021 10/28/2021 5 20 2 Grading Grading 10/29/2021 12/23/2021 5 40
3 Paving Paving 12/24/2021 2/3/2022 5 30
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio-CO2 Total CO2 CH4 N20 CO2e
Percent
Reduction

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 CalEEMod Version: CalEEMod.2020.4.0 Page 6 of 34 Date: 9/29/2021 8:53 AM Rancho Descanso, DHS - Salton Sea Air Basin, Annual
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

4 Building Construction Building Construction 1/1/2022 9/30/2023 5 455 5 Architectural Coating Architectural Coating 10/1/2022 4/28/2023 5 260 OffRoad Equipment
Phase Name Offroad Equipment Type Amount Usage Hours Horse Power Load Factor Site Preparation Rubber Tired Dozers 3 8.00 247 0.40
Site Preparation Tractors/Loaders/Backhoes 4 8.00 97 0.37 Grading Excavators 2 8.00 158 0.38
Grading Graders 1 8.00 187 0.41
Grading Rubber Tired Dozers 1 8.00 247 0.40
Grading Scrapers 2 8.00 367 0.48
Grading Tractors/Loaders/Backhoes 2 8.00 97 0.37
Building Construction Cranes 1 7.00 231 0.29
Building Construction Forklifts 3 8.00 89 0.20
Building Construction Generator Sets 1 8.00 84 0.74
Building Construction Tractors/Loaders/Backhoes 3 7.00 97 0.37 Building Construction Welders 1 8.00 46 0.45
Paving Pavers 2 8.00 130 0.42
Paving Paving Equipment 2 8.00 132 0.36
Paving Rollers 2 8.00 80 0.38
Architectural Coating Air Compressors 1 6.00 78 0.48
Trips and VMT
Residential Indoor: 277,020; Residential Outdoor: 92,340; Non-Residential Indoor: 0; Non-Residential Outdoor: 0; Striped Parking Area: 0 (Architectural Coating – sqft)
Acres of Grading (Site Preparation Phase): 15
Acres of Grading (Grading Phase): 17.83
Acres of Paving: 0
CalEEMod Version: CalEEMod.2020.4.0 Page 7 of 34 Date: 9/29/2021 8:53 AM Rancho Descanso, DHS - Salton Sea Air Basin, Annual
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

3.2 Site Preparation - 2021
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category tons/yr MT/yr
Fugitive Dust 0.1886 0.0000 0.1886 0.1002 0.0000 0.1002 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Off-Road 0.0389 0.4050 0.2115 3.8000e0040.0204 0.0204 0.0188 0.0188 0.0000 33.4357 33.4357 0.0108 0.0000 33.7061 Total 0.0389 0.4050 0.2115 3.8000e0040.1886 0.0204 0.2091 0.1002 0.0188 0.1190 0.0000 33.4357 33.4357 0.0108 0.0000 33.7061 Unmitigated Construction On-Site

3.1 Mitigation Measures Construction
Use Soil Stabilizer
Replace Ground Cover
Water Exposed Area
Phase Name Offroad Equipment
Count
Worker Trip
Number
Vendor Trip
Number
Hauling Trip
Number
Worker Trip
Length
Vendor Trip
Length
Hauling Trip
Length
Worker Vehicle
Class
Vendor
Vehicle Class
Hauling
Vehicle Class
Site Preparation 7 18.00 0.00 0.00 11.00 5.40 20.00 LD_Mix HDT_Mix HHDT Grading 8 20.00 0.00 817.00 11.00 5.40 20.00 LD_Mix HDT_Mix HHDT Building Construction 9 27.00 8.00 0.00 11.00 5.40 20.00 LD_Mix HDT_Mix HHDT Paving 6 15.00 0.00 0.00 11.00 5.40 20.00 LD_Mix HDT_Mix HHDT Architectural Coating 1 5.00 0.00 0.00 11.00 5.40 20.00 LD_Mix HDT_Mix HHDT CalEEMod Version: CalEEMod.2020.4.0 Page 8 of 34 Date: 9/29/2021 8:53 AM Rancho Descanso, DHS - Salton Sea Air Basin, Annual
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

3.2 Site Preparation - 2021
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category tons/yr MT/yr
Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 7.5000e0045.2000e0046.1600e0031.0000e0051.4900e0031.0000e0051.5000e0034.0000e0041.0000e0054.0000e0040.0000 1.2459 1.2459 4.0000e0054.0000e0051.2594 Total 7.5000e0045.2000e0046.1600e0031.0000e0051.4900e0031.0000e0051.5000e0034.0000e0041.0000e0054.0000e0040.0000 1.2459 1.2459 4.0000e0054.0000e0051.2594 Unmitigated Construction Off-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category tons/yr MT/yr
Fugitive Dust 0.0699 0.0000 0.0699 0.0371 0.0000 0.0371 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Off-Road 0.0389 0.4050 0.2115 3.8000e0040.0204 0.0204 0.0188 0.0188 0.0000 33.4357 33.4357 0.0108 0.0000 33.7060 Total 0.0389 0.4050 0.2115 3.8000e0040.0699 0.0204 0.0903 0.0371 0.0188 0.0559 0.0000 33.4357 33.4357 0.0108 0.0000 33.7060 Mitigated Construction On-Site
CalEEMod Version: CalEEMod.2020.4.0 Page 9 of 34 Date: 9/29/2021 8:53 AM Rancho Descanso, DHS - Salton Sea Air Basin, Annual
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

3.2 Site Preparation - 2021
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category tons/yr MT/yr
Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 7.5000e0045.2000e0046.1600e0031.0000e0051.4900e0031.0000e0051.5000e0034.0000e0041.0000e0054.0000e0040.0000 1.2459 1.2459 4.0000e0054.0000e0051.2594 Total 7.5000e0045.2000e0046.1600e0031.0000e0051.4900e0031.0000e0051.5000e0034.0000e0041.0000e0054.0000e0040.0000 1.2459 1.2459 4.0000e0054.0000e0051.2594 Mitigated Construction Off-Site

3.3 Grading - 2021
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category tons/yr MT/yr
Fugitive Dust 0.1299 0.0000 0.1299 0.0672 0.0000 0.0672 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Off-Road 0.0838 0.9280 0.6176 1.2400e0030.0397 0.0397 0.0365 0.0365 0.0000 108.9900 108.9900 0.0353 0.0000 109.8712 Total 0.0838 0.9280 0.6176 1.2400e0030.1299 0.0397 0.1696 0.0672 0.0365 0.1038 0.0000 108.9900 108.9900 0.0353 0.0000 109.8712 Unmitigated Construction On-Site
CalEEMod Version: CalEEMod.2020.4.0 Page 10 of 34 Date: 9/29/2021 8:53 AM Rancho Descanso, DHS - Salton Sea Air Basin, Annual
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

3.3 Grading - 2021
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category tons/yr MT/yr
Hauling 1.6700e0030.0590 0.0137 2.4000e0047.0900e0039.0000e0047.9900e0031.9500e0038.6000e0042.8100e0030.0000 22.8236 22.8236 1.7000e0043.5900e00323.8976 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 1.6600e0031.1600e0030.0137 3.0000e0053.3100e0032.0000e0053.3300e0038.8000e0042.0000e0059.0000e0040.0000 2.7687 2.7687 1.0000e0049.0000e0052.7987 Total 3.3300e0030.0601 0.0274 2.7000e0040.0104 9.2000e0040.0113 2.8300e0038.8000e0043.7100e0030.0000 25.5923 25.5923 2.7000e0043.6800e00326.6963 Unmitigated Construction Off-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category tons/yr MT/yr
Fugitive Dust 0.0481 0.0000 0.0481 0.0249 0.0000 0.0249 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Off-Road 0.0838 0.9280 0.6176 1.2400e0030.0397 0.0397 0.0365 0.0365 0.0000 108.9898 108.9898 0.0353 0.0000 109.8711 Total 0.0838 0.9280 0.6176 1.2400e0030.0481 0.0397 0.0878 0.0249 0.0365 0.0614 0.0000 108.9898 108.9898 0.0353 0.0000 109.8711 Mitigated Construction On-Site
CalEEMod Version: CalEEMod.2020.4.0 Page 11 of 34 Date: 9/29/2021 8:53 AM Rancho Descanso, DHS - Salton Sea Air Basin, Annual
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

3.3 Grading - 2021
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category tons/yr MT/yr
Hauling 1.6700e0030.0590 0.0137 2.4000e0047.0900e0039.0000e0047.9900e0031.9500e0038.6000e0042.8100e0030.0000 22.8236 22.8236 1.7000e0043.5900e00323.8976 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 1.6600e0031.1600e0030.0137 3.0000e0053.3100e0032.0000e0053.3300e0038.8000e0042.0000e0059.0000e0040.0000 2.7687 2.7687 1.0000e0049.0000e0052.7987 Total 3.3300e0030.0601 0.0274 2.7000e0040.0104 9.2000e0040.0113 2.8300e0038.8000e0043.7100e0030.0000 25.5923 25.5923 2.7000e0043.6800e00326.6963 Mitigated Construction Off-Site

3.4 Paving - 2021
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category tons/yr MT/yr
Off-Road 3.7700e0030.0388 0.0440 7.0000e0052.0300e0032.0300e0031.8700e0031.8700e0030.0000 6.0070 6.0070 1.9400e0030.0000 6.0556 Paving 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Total 3.7700e0030.0388 0.0440 7.0000e0052.0300e0032.0300e0031.8700e0031.8700e0030.0000 6.0070 6.0070 1.9400e0030.0000 6.0556 Unmitigated Construction On-Site
CalEEMod Version: CalEEMod.2020.4.0 Page 12 of 34 Date: 9/29/2021 8:53 AM Rancho Descanso, DHS - Salton Sea Air Basin, Annual
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

3.4 Paving - 2021
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category tons/yr MT/yr
Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 1.9000e0041.3000e0041.5400e0030.0000 3.7000e0040.0000 3.7000e0041.0000e0040.0000 1.0000e0040.0000 0.3115 0.3115 1.0000e0051.0000e0050.3149 Total 1.9000e0041.3000e0041.5400e0030.0000 3.7000e0040.0000 3.7000e0041.0000e0040.0000 1.0000e0040.0000 0.3115 0.3115 1.0000e0051.0000e0050.3149 Unmitigated Construction Off-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category tons/yr MT/yr
Off-Road 3.7700e0030.0388 0.0440 7.0000e0052.0300e0032.0300e0031.8700e0031.8700e0030.0000 6.0070 6.0070 1.9400e0030.0000 6.0556 Paving 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Total 3.7700e0030.0388 0.0440 7.0000e0052.0300e0032.0300e0031.8700e0031.8700e0030.0000 6.0070 6.0070 1.9400e0030.0000 6.0556 Mitigated Construction On-Site
CalEEMod Version: CalEEMod.2020.4.0 Page 13 of 34 Date: 9/29/2021 8:53 AM Rancho Descanso, DHS - Salton Sea Air Basin, Annual
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

3.4 Paving - 2021
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category tons/yr MT/yr
Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 1.9000e0041.3000e0041.5400e0030.0000 3.7000e0040.0000 3.7000e0041.0000e0040.0000 1.0000e0040.0000 0.3115 0.3115 1.0000e0051.0000e0050.3149 Total 1.9000e0041.3000e0041.5400e0030.0000 3.7000e0040.0000 3.7000e0041.0000e0040.0000 1.0000e0040.0000 0.3115 0.3115 1.0000e0051.0000e0050.3149 Mitigated Construction Off-Site

3.4 Paving - 2022
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category tons/yr MT/yr
Off-Road 0.0132 0.1335 0.1750 2.7000e0046.8100e0036.8100e0036.2700e0036.2700e0030.0000 24.0331 24.0331 7.7700e0030.0000 24.2274 Paving 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Total 0.0132 0.1335 0.1750 2.7000e0046.8100e0036.8100e0036.2700e0036.2700e0030.0000 24.0331 24.0331 7.7700e0030.0000 24.2274 Unmitigated Construction On-Site
CalEEMod Version: CalEEMod.2020.4.0 Page 14 of 34 Date: 9/29/2021 8:53 AM Rancho Descanso, DHS - Salton Sea Air Basin, Annual
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

3.4 Paving - 2022
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category tons/yr MT/yr
Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 6.9000e0044.6000e0045.6100e0031.0000e0051.4900e0031.0000e0051.5000e0034.0000e0041.0000e0054.0000e0040.0000 1.2121 1.2121 4.0000e0054.0000e0051.2244 Total 6.9000e0044.6000e0045.6100e0031.0000e0051.4900e0031.0000e0051.5000e0034.0000e0041.0000e0054.0000e0040.0000 1.2121 1.2121 4.0000e0054.0000e0051.2244 Unmitigated Construction Off-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category tons/yr MT/yr
Off-Road 0.0132 0.1335 0.1750 2.7000e0046.8100e0036.8100e0036.2700e0036.2700e0030.0000 24.0330 24.0330 7.7700e0030.0000 24.2274 Paving 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Total 0.0132 0.1335 0.1750 2.7000e0046.8100e0036.8100e0036.2700e0036.2700e0030.0000 24.0330 24.0330 7.7700e0030.0000 24.2274 Mitigated Construction On-Site
CalEEMod Version: CalEEMod.2020.4.0 Page 15 of 34 Date: 9/29/2021 8:53 AM Rancho Descanso, DHS - Salton Sea Air Basin, Annual
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

3.4 Paving - 2022
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category tons/yr MT/yr
Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 6.9000e0044.6000e0045.6100e0031.0000e0051.4900e0031.0000e0051.5000e0034.0000e0041.0000e0054.0000e0040.0000 1.2121 1.2121 4.0000e0054.0000e0051.2244 Total 6.9000e0044.6000e0045.6100e0031.0000e0051.4900e0031.0000e0051.5000e0034.0000e0041.0000e0054.0000e0040.0000 1.2121 1.2121 4.0000e0054.0000e0051.2244 Mitigated Construction Off-Site

3.5 Building Construction - 2022
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category tons/yr MT/yr
Off-Road 0.2218 2.0300 2.1272 3.5000e0030.1052 0.1052 0.0990 0.0990 0.0000 301.2428 301.2428 0.0722 0.0000 303.0471 Total 0.2218 2.0300 2.1272 3.5000e0030.1052 0.1052 0.0990 0.0990 0.0000 301.2428 301.2428 0.0722 0.0000 303.0471 Unmitigated Construction On-Site
CalEEMod Version: CalEEMod.2020.4.0 Page 16 of 34 Date: 9/29/2021 8:53 AM Rancho Descanso, DHS - Salton Sea Air Basin, Annual
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

3.5 Building Construction - 2022
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category tons/yr MT/yr
Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 1.8000e0030.0385 0.0184 1.6000e0045.1700e0034.5000e0045.6300e0031.4900e0034.3000e0041.9300e0030.0000 15.1290 15.1290 1.3000e0042.1400e00315.7692 Worker 0.0134 8.9600e0030.1094 2.6000e0040.0290 1.6000e0040.0292 7.7000e0031.4000e0047.8500e0030.0000 23.6353 23.6353 7.7000e0047.4000e00423.8760 Total 0.0152 0.0475 0.1278 4.2000e0040.0342 6.1000e0040.0348 9.1900e0035.7000e0049.7800e0030.0000 38.7644 38.7644 9.0000e0042.8800e00339.6451 Unmitigated Construction Off-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category tons/yr MT/yr
Off-Road 0.2218 2.0300 2.1272 3.5000e0030.1052 0.1052 0.0990 0.0990 0.0000 301.2425 301.2425 0.0722 0.0000 303.0467 Total 0.2218 2.0300 2.1272 3.5000e0030.1052 0.1052 0.0990 0.0990 0.0000 301.2425 301.2425 0.0722 0.0000 303.0467 Mitigated Construction On-Site
CalEEMod Version: CalEEMod.2020.4.0 Page 17 of 34 Date: 9/29/2021 8:53 AM Rancho Descanso, DHS - Salton Sea Air Basin, Annual
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

3.5 Building Construction - 2022
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category tons/yr MT/yr
Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 1.8000e0030.0385 0.0184 1.6000e0045.1700e0034.5000e0045.6300e0031.4900e0034.3000e0041.9300e0030.0000 15.1290 15.1290 1.3000e0042.1400e00315.7692 Worker 0.0134 8.9600e0030.1094 2.6000e0040.0290 1.6000e0040.0292 7.7000e0031.4000e0047.8500e0030.0000 23.6353 23.6353 7.7000e0047.4000e00423.8760 Total 0.0152 0.0475 0.1278 4.2000e0040.0342 6.1000e0040.0348 9.1900e0035.7000e0049.7800e0030.0000 38.7644 38.7644 9.0000e0042.8800e00339.6451 Mitigated Construction Off-Site

3.5 Building Construction - 2023
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category tons/yr MT/yr
Off-Road 0.1533 1.4025 1.5838 2.6300e0030.0682 0.0682 0.0642 0.0642 0.0000 226.0096 226.0096 0.0538 0.0000 227.3537 Total 0.1533 1.4025 1.5838 2.6300e0030.0682 0.0682 0.0642 0.0642 0.0000 226.0096 226.0096 0.0538 0.0000 227.3537 Unmitigated Construction On-Site
CalEEMod Version: CalEEMod.2020.4.0 Page 18 of 34 Date: 9/29/2021 8:53 AM Rancho Descanso, DHS - Salton Sea Air Basin, Annual
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

3.5 Building Construction - 2023
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category tons/yr MT/yr
Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 1.1000e0030.0238 0.0132 1.1000e0043.8800e0031.8000e0044.0600e0031.1200e0031.7000e0041.2900e0030.0000 10.9714 10.9714 8.0000e0051.5400e00311.4323 Worker 9.3400e0035.9300e0030.0751 1.9000e0040.0218 1.1000e0040.0219 5.7800e0031.0000e0045.8800e0030.0000 17.2564 17.2564 5.2000e0045.1000e00417.4222 Total 0.0104 0.0297 0.0883 3.0000e0040.0256 2.9000e0040.0259 6.9000e0032.7000e0047.1700e0030.0000 28.2278 28.2278 6.0000e0042.0500e00328.8545 Unmitigated Construction Off-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category tons/yr MT/yr
Off-Road 0.1533 1.4025 1.5838 2.6300e0030.0682 0.0682 0.0642 0.0642 0.0000 226.0094 226.0094 0.0538 0.0000 227.3535 Total 0.1533 1.4025 1.5838 2.6300e0030.0682 0.0682 0.0642 0.0642 0.0000 226.0094 226.0094 0.0538 0.0000 227.3535 Mitigated Construction On-Site
CalEEMod Version: CalEEMod.2020.4.0 Page 19 of 34 Date: 9/29/2021 8:53 AM Rancho Descanso, DHS - Salton Sea Air Basin, Annual
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

3.5 Building Construction - 2023
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category tons/yr MT/yr
Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 1.1000e0030.0238 0.0132 1.1000e0043.8800e0031.8000e0044.0600e0031.1200e0031.7000e0041.2900e0030.0000 10.9714 10.9714 8.0000e0051.5400e00311.4323 Worker 9.3400e0035.9300e0030.0751 1.9000e0040.0218 1.1000e0040.0219 5.7800e0031.0000e0045.8800e0030.0000 17.2564 17.2564 5.2000e0045.1000e00417.4222 Total 0.0104 0.0297 0.0883 3.0000e0040.0256 2.9000e0040.0259 6.9000e0032.7000e0047.1700e0030.0000 28.2278 28.2278 6.0000e0042.0500e00328.8545 Mitigated Construction Off-Site

3.6 Architectural Coating - 2022
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category tons/yr MT/yr
Archit. Coating 0.2140 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Off-Road 6.6500e0030.0458 0.0589 1.0000e0042.6600e0032.6600e0032.6600e0032.6600e0030.0000 8.2981 8.2981 5.4000e0040.0000 8.3116 Total 0.2207 0.0458 0.0589 1.0000e0042.6600e0032.6600e0032.6600e0032.6600e0030.0000 8.2981 8.2981 5.4000e0040.0000 8.3116 Unmitigated Construction On-Site
CalEEMod Version: CalEEMod.2020.4.0 Page 20 of 34 Date: 9/29/2021 8:53 AM Rancho Descanso, DHS - Salton Sea Air Basin, Annual
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

3.6 Architectural Coating - 2022
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category tons/yr MT/yr
Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 6.2000e0044.1000e0045.0600e0031.0000e0051.3400e0031.0000e0051.3500e0033.6000e0041.0000e0053.6000e0040.0000 1.0942 1.0942 4.0000e0053.0000e0051.1054 Total 6.2000e0044.1000e0045.0600e0031.0000e0051.3400e0031.0000e0051.3500e0033.6000e0041.0000e0053.6000e0040.0000 1.0942 1.0942 4.0000e0053.0000e0051.1054 Unmitigated Construction Off-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category tons/yr MT/yr
Archit. Coating 0.2140 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Off-Road 6.6500e0030.0458 0.0589 1.0000e0042.6600e0032.6600e0032.6600e0032.6600e0030.0000 8.2981 8.2981 5.4000e0040.0000 8.3116 Total 0.2207 0.0458 0.0589 1.0000e0042.6600e0032.6600e0032.6600e0032.6600e0030.0000 8.2981 8.2981 5.4000e0040.0000 8.3116 Mitigated Construction On-Site
CalEEMod Version: CalEEMod.2020.4.0 Page 21 of 34 Date: 9/29/2021 8:53 AM Rancho Descanso, DHS - Salton Sea Air Basin, Annual
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

3.6 Architectural Coating - 2022
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category tons/yr MT/yr
Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 6.2000e0044.1000e0045.0600e0031.0000e0051.3400e0031.0000e0051.3500e0033.6000e0041.0000e0053.6000e0040.0000 1.0942 1.0942 4.0000e0053.0000e0051.1054 Total 6.2000e0044.1000e0045.0600e0031.0000e0051.3400e0031.0000e0051.3500e0033.6000e0041.0000e0053.6000e0040.0000 1.0942 1.0942 4.0000e0053.0000e0051.1054 Mitigated Construction Off-Site

3.6 Architectural Coating - 2023
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category tons/yr MT/yr
Archit. Coating 0.2798 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Off-Road 8.1500e0030.0554 0.0770 1.3000e0043.0100e0033.0100e0033.0100e0033.0100e0030.0000 10.8513 10.8513 6.5000e0040.0000 10.8676 Total 0.2880 0.0554 0.0770 1.3000e0043.0100e0033.0100e0033.0100e0033.0100e0030.0000 10.8513 10.8513 6.5000e0040.0000 10.8676 Unmitigated Construction On-Site
CalEEMod Version: CalEEMod.2020.4.0 Page 22 of 34 Date: 9/29/2021 8:53 AM Rancho Descanso, DHS - Salton Sea Air Basin, Annual
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

3.6 Architectural Coating - 2023
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category tons/yr MT/yr
Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 7.5000e0044.8000e0046.0600e0032.0000e0051.7600e0031.0000e0051.7700e0034.7000e0041.0000e0054.7000e0040.0000 1.3930 1.3930 4.0000e0054.0000e0051.4064 Total 7.5000e0044.8000e0046.0600e0032.0000e0051.7600e0031.0000e0051.7700e0034.7000e0041.0000e0054.7000e0040.0000 1.3930 1.3930 4.0000e0054.0000e0051.4064 Unmitigated Construction Off-Site
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category tons/yr MT/yr
Archit. Coating 0.2798 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Off-Road 8.1500e0030.0554 0.0770 1.3000e0043.0100e0033.0100e0033.0100e0033.0100e0030.0000 10.8513 10.8513 6.5000e0040.0000 10.8676 Total 0.2880 0.0554 0.0770 1.3000e0043.0100e0033.0100e0033.0100e0033.0100e0030.0000 10.8513 10.8513 6.5000e0040.0000 10.8676 Mitigated Construction On-Site
CalEEMod Version: CalEEMod.2020.4.0 Page 23 of 34 Date: 9/29/2021 8:53 AM Rancho Descanso, DHS - Salton Sea Air Basin, Annual
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

3.6 Architectural Coating - 2023
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category tons/yr MT/yr
Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 7.5000e0044.8000e0046.0600e0032.0000e0051.7600e0031.0000e0051.7700e0034.7000e0041.0000e0054.7000e0040.0000 1.3930 1.3930 4.0000e0054.0000e0051.4064 Total 7.5000e0044.8000e0046.0600e0032.0000e0051.7600e0031.0000e0051.7700e0034.7000e0041.0000e0054.7000e0040.0000 1.3930 1.3930 4.0000e0054.0000e0051.4064 Mitigated Construction Off-Site
CalEEMod Version: CalEEMod.2020.4.0 Page 24 of 34 Date: 9/29/2021 8:53 AM Rancho Descanso, DHS - Salton Sea Air Basin, Annual
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

4.0 Operational Detail - Mobile
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category tons/yr MT/yr
Mitigated 0.3475 0.4434 2.8537 6.0700e0030.6023 4.8300e0030.6071 0.1608 4.5200e0030.1653 0.0000 565.7844 565.7844 0.0318 0.0303 575.6192 Unmitigated 0.3475 0.4434 2.8537 6.0700e0030.6023 4.8300e0030.6071 0.1608 4.5200e0030.1653 0.0000 565.7844 565.7844 0.0318 0.0303 575.6192

4.1 Mitigation Measures Mobile

4.2 Trip Summary Information

4.3 Trip Type Information
Average Daily Trip Rate Unmitigated Mitigated
Land Use Weekday Saturday Sunday Annual VMT Annual VMT
Single Family Housing 717.44 725.04 649.80 1,585,670 1,585,670 Total 717.44 725.04 649.80 1,585,670 1,585,670
Miles Trip % Trip Purpose %
Land Use H-W or C-W H-S or C-C H-O or C-NW H-W or C-W H-S or C-C H-O or C-NW Primary Diverted Pass-by Single Family Housing 11.00 3.50 4.50 40.20 19.20 40.60 86 11 3

4.4 Fleet Mix
Land Use LDA LDT1 LDT2 MDV LHD1 LHD2 MHD HHD OBUS UBUS MCY SBUS MH Single Family Housing 0.515135 0.060169 0.185335 0.147842 0.025432 0.007034 0.010598 0.020349 0.000855 0.000237 0.021941 0.000925 0.004146 CalEEMod Version: CalEEMod.2020.4.0 Page 25 of 34 Date: 9/29/2021 8:53 AM Rancho Descanso, DHS - Salton Sea Air Basin, Annual
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

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

0.0000 0.0000 0.0000 0.0000 0.0000 107.3498 107.3498 9.0600e0031.1000e003107.9036 Electricity
Unmitigated

0.0000 0.0000 0.0000 0.0000 0.0000 107.3498 107.3498 9.0600e0031.1000e003107.9036 NaturalGas
Mitigated

0.0116 0.0991 0.0422 6.3000e0048.0100e0038.0100e0038.0100e0038.0100e0030.0000 114.7219 114.7219 2.2000e0032.1000e003115.4037 NaturalGas
Unmitigated

0.0116 0.0991 0.0422 6.3000e0048.0100e0038.0100e0038.0100e0038.0100e0030.0000 114.7219 114.7219 2.2000e0032.1000e003115.4037

5.1 Mitigation Measures Energy
Historical Energy Use: N
CalEEMod Version: CalEEMod.2020.4.0 Page 26 of 34 Date: 9/29/2021 8:53 AM Rancho Descanso, DHS - Salton Sea Air Basin, Annual
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

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

2.14981e
+006

0.0116 0.0991 0.0422 6.3000e0048.0100e0038.0100e0038.0100e0038.0100e0030.0000 114.7219 114.7219 2.2000e0032.1000e003115.4037 Total 0.0116 0.0991 0.0422 6.3000e0048.0100e0038.0100e0038.0100e0038.0100e0030.0000 114.7219 114.7219 2.2000e0032.1000e003115.4037 Unmitigated
NaturalGa
s Use
ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Land Use kBTU/yr tons/yr MT/yr
Single Family
Housing

2.14981e
+006

0.0116 0.0991 0.0422 6.3000e0048.0100e0038.0100e0038.0100e0038.0100e0030.0000 114.7219 114.7219 2.2000e0032.1000e003115.4037 Total 0.0116 0.0991 0.0422 6.3000e0048.0100e0038.0100e0038.0100e0038.0100e0030.0000 114.7219 114.7219 2.2000e0032.1000e003115.4037 Mitigated
CalEEMod Version: CalEEMod.2020.4.0 Page 27 of 34 Date: 9/29/2021 8:53 AM Rancho Descanso, DHS - Salton Sea Air Basin, Annual
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

6.1 Mitigation Measures Area

6.0 Area Detail

5.3 Energy by Land Use - Electricity
Electricity
Use
Total CO2 CH4 N2O CO2e
Land Use kWh/yr MT/yr
Single Family
Housing
605314 107.3498 9.0600e0031.1000e003107.9036
Total 107.3498 9.0600e0031.1000e003107.9036
Unmitigated
Electricity
Use
Total CO2 CH4 N2O CO2e
Land Use kWh/yr MT/yr
Single Family
Housing
605314 107.3498 9.0600e0031.1000e003107.9036
Total 107.3498 9.0600e0031.1000e003107.9036
Mitigated
CalEEMod Version: CalEEMod.2020.4.0 Page 28 of 34 Date: 9/29/2021 8:53 AM Rancho Descanso, DHS - Salton Sea Air Basin, Annual
EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied Item Number: 4.

ROG NOx CO SO2 Fugitive
PM10
Exhaust
PM10
PM10
Total
Fugitive
PM2.5
Exhaust
PM2.5
PM2.5
Total
Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e
Category tons/yr MT/yr
Mitigated 0.6370 7.8900e0030.5650 4.0000e0053.2400e0033.2400e0033.2400e0033.2400e0030.0000 2.5274 2.5274 9.2000e0043.0000e0052.5591 Unmitigated 0.6370 7.8900e0030.5650 4.0000e0053.2400e0033.2400e0033.2400e0033.2400e0030.0000 2.5274 2.5274 9.2000e0043.0000e0052.5591

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

0.0856 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Consumer
Products

0.5343 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Hearth 1.6000e0041.3900e0035.9000e0041.0000e0051.1000e0041.1000e0041.1000e0041.1000e0040.0000 1.6056 1.6056 3.0000e0053.0000e0051.6152 Landscaping 0.0170 6.5100e0030.5644 3.0000e0053.1200e0033.1200e0033.1200e0033.1200e0030.0000 0.9218 0.9218 8.9000e0040.0000 0.9440 Total 0.6370 7.9000e0030.5650 4.0000e0053.2300e0033.2300e0033.2300e0033.2300e0030.0000 2.5274 2.5274 9.2000e0043.0000e0052.5591 Unmitigated
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7.1 Mitigation Measures Water

7.0 Water Detail

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

0.0856 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Consumer
Products

0.5343 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Hearth 1.6000e0041.3900e0035.9000e0041.0000e0051.1000e0041.1000e0041.1000e0041.1000e0040.0000 1.6056 1.6056 3.0000e0053.0000e0051.6152 Landscaping 0.0170 6.5100e0030.5644 3.0000e0053.1200e0033.1200e0033.1200e0033.1200e0030.0000 0.9218 0.9218 8.9000e0040.0000 0.9440 Total 0.6370 7.9000e0030.5650 4.0000e0053.2300e0033.2300e0033.2300e0033.2300e0030.0000 2.5274 2.5274 9.2000e0043.0000e0052.5591 Mitigated
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Total CO2 CH4 N2O CO2e
Category MT/yr
Mitigated 19.1563 0.1628 3.9900e00324.4161
Unmitigated 19.1563 0.1628 3.9900e00324.4161

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

4.95171 /

3.12173

19.1563 0.1628 3.9900e00324.4161
Total 19.1563 0.1628 3.9900e00324.4161
Unmitigated
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7.2 Water by Land Use
Indoor/Out
door Use
Total CO2 CH4 N2O CO2e
Land Use Mgal MT/yr
Single Family
Housing

4.95171 /

3.12173

19.1563 0.1628 3.9900e00324.4161
Total 19.1563 0.1628 3.9900e00324.4161
Mitigated

8.1 Mitigation Measures Waste

8.0 Waste Detail
Total CO2 CH4 N2O CO2e
MT/yr
Mitigated 20.3904 1.2050 0.0000 50.5165
Unmitigated 20.3904 1.2050 0.0000 50.5165
Category/Year
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8.2 Waste by Land Use
Waste
Disposed
Total CO2 CH4 N2O CO2e
Land Use tons MT/yr
Single Family
Housing
100.45 20.3904 1.2050 0.0000 50.5165
Total 20.3904 1.2050 0.0000 50.5165
Unmitigated
Waste
Disposed
Total CO2 CH4 N2O CO2e
Land Use tons MT/yr
Single Family
Housing
100.45 20.3904 1.2050 0.0000 50.5165
Total 20.3904 1.2050 0.0000 50.5165
Mitigated

9.0 Operational Offroad
Equipment Type Number Hours/Day Days/Year Horse Power Load Factor Fuel Type CalEEMod Version: CalEEMod.2020.4.0 Page 33 of 34 Date: 9/29/2021 8:53 AM Rancho Descanso, DHS - Salton Sea Air Basin, Annual
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11.0 Vegetation

10.0 Stationary Equipment
Fire Pumps and Emergency Generators
Equipment Type Number Hours/Day Hours/Year Horse Power Load Factor Fuel Type Boilers
Equipment Type Number Heat Input/Day Heat Input/Year Boiler Rating Fuel Type User Defined Equipment
Equipment Type Number
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Rancho Descanso Project
Tentative Tract Map 38200
Assessor’s Parcel Numbers 656-080-016 & -014 and 656-400-042 & -049 Biological Resources Assessment & Coachella Valley
Multiple Species Habitat Conservation Plan Compliance Report City of Desert Hot Springs, Riverside County, California Submitted to:

Terra Nova Planning and Research, Inc.
42635 Melanie Place, Suite 101
Palm Desert, CA 92211
Contact: Nicole Criste
(760) 341-4800, [email protected]
Submitted by:

Wood Environment and Infrastructure Solutions, Inc.
1845 Chicago Avenue, Suite D
Riverside, CA 92507
Contact: John F. Green, Senior Biologist
(951) 369-8060, [email protected]
27 August 2021
Item Number: 4.

Rancho Descanso Project
Biological Resources Assessment & MSHCP Compliance Report August 2021
i

TABLE OF CONTENTS
PAGE

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

2.0 REGULATORY FRAMEWORK.........................................................................................................1

2.1 Coachella Valley Multiple Species Habitat Conservation Plan ...........................1

2.2 Protection of Migratory Birds.........................................................................................6

2.2.1 Migratory Bird Treaty Act .............................................................................6

2.2.2 Section 3503, 3505.5, & 3513 of the State Fish and Game Code...7

2.3 Waters of the United States and the State of California ......................................7

2.3.1 United States Army Corps of Engineers (USACE).................................7

2.3.2 Regional Water Quality Control Board (RWQCB) ................................7

2.3.3 California Department of Fish and Wildlife............................................7

3.0 METHODS............................................................................................................................................8

3.1 Literature Review.................................................................................................................8

3.2 Field Assessment.................................................................................................................8

4.0 RESULTS...............................................................................................................................................8

4.1 Topography and Soils .......................................................................................................9

4.2 Hydrology / Jurisdictional Waters.................................................................................9

4.3 Vegetation.............................................................................................................................9

4.4 CVMSHCP Conservation Areas ................................................................................... 14

4.5 Wildlife................................................................................................................................. 14

4.6 Special status Elements ................................................................................................. 14

5.0 Discussion AND RECOMMENDATIONS ................................................................................ 20

5.1 Hydrology / Jurisdictional Waters.............................................................................. 20

5.2 Special status Elements Tables ................................................................................... 20

5.2.1 Plants and Vegetation................................................................................. 20

5.2.2 Burrowing Owl ............................................................................................... 20

5.2.3 Other Special status Bird Species............................................................ 21

5.3 Migratory Bird Treaty Act (MBTA) and State Code.............................................. 21

5.4 CVMSHCP Plan Consistency ........................................................................................ 21

6.0 CONCLUSION ................................................................................................................................. 21

7.0 LITERATURE CITED AND REFERENCES................................................................................... 22 Item Number: 4.

Rancho Descanso Project
Biological Resources Assessment & MSHCP Compliance Report August 2021
ii

TABLE OF FIGURES
Figure 1. Vicinity & Location.......................................................................................................................................2 Figure 2. Site Topography............................................................................................................................................4 Figure 3. Soils..................................................................................................................................................................10 Figure 4. Vegetation Communities.........................................................................................................................12

TABLE OF TABLES
Table 1. Special status Plants .............................................................................................................. 15 Table 2. Special status Vegetation Communities......................................................................... 16 Table 3. Special status Reptiles........................................................................................................... 16 Table 4. Special status Birds................................................................................................................. 17 Table 5. Special status Mammals....................................................................................................... 18

LIST OF APPENDICES
Appendix 1. Preliminary Site Plan................................................................................................................................

Appendix 2. Species List: Plants....................................................................................................................................

Appendix 3.Species List: Animals .................................................................................................................................

Appendix 4. Photographic Exhibits .............................................................................................................................

Appendix 5. Coachella Valley Native Plants Recommended For Landscaping...........................................

Appendix 6. Prohibited Invasive Ornamental Plants.............................................................................................

Item Number: 4.

Rancho Descanso Project
Biological Resources Assessment & MSHCP Compliance Report August 2021
1 1.0 INTRODUCTION
At the request of Terra Nova Planning and Research, Inc., this biological resources assessment & Coachella Valley Multiple Species Habitat Conservation Plan (CVMSHCP) compliance report was prepared by Wood Environment & Infrastructure Solutions, Inc. (Wood) for the proposed Rancho Descanso Project (project) (Figure 1). The project site is in the City of Desert Hot Springs, Riverside County, California located west of Avenue Descanso, north of El Dorado Place, east of Palm Drive, and with unpaved Camino Campesino forming the approximate northern boundary. It is located within Section 6 of Township 3 South, Range 5 East of the United States Geological Survey (USGS)

7.5’ Seven Palms Valley, Calif. quadrangle (Figure 2). The project site encompasses the following Assessor’s Parcel Numbers (APN): 656-080-016, 656-080-014, 656-400-042, and 656-400-049. The recorded lot size of these four parcels is 19.48-acres (Riverside County Information Technology 2021), however Tentative Tract Map 38200 is reporting a gross project acreage of 17.83-acres and a net of 16.57-acres. The project will consist of 76 residential lots and their associated infrastructure. See Tentative Tract Map 38200, Appendix 1. Information contained herein is intended to be used for compliance with state and federal regulations intended to protect wildlife, special status elements, and their habitats.

2.0 REGULATORY FRAMEWORK
Several relevant biological and environmental regulations have been included in this section, but the CVMSHCP is the primary regulatory entity for this project.

2.1 Coachella Valley Multiple Species Habitat Conservation Plan Finalized in October 2008, the CVMSHCP is a comprehensive regional plan that addresses the conservation needs of 27 species of native flora and fauna and 27 natural vegetation communities occurring throughout the Coachella Valley region of western Riverside County, California (Coachella Valley Association of Governments [CVAG] 2021). Permits for the CVMSHCP were issued by the California Department of Fish and Game (CDFG) [now the California Department of Fish and Wildlife (CDFW)] on September 9, 2008, and the United States Fish and Wildlife Service (USFWS) on October 1, 2008 (TE104604-0). The CVMSHCP serves two primary purposes: Balancing environmental protection and economic development objectives in the CVMSHCP area and simplifying compliance with endangered species related laws. The CVMSHCP accomplishes this by conserving unfragmented habitat to permanently protect and secure viable populations of the covered species.

The covered species include plants and animals that are either currently listed as threatened or endangered, are proposed for listing, or were believed by an USFWS and CDFW appointed Scientific Advisory Committee, to have a high probability of being proposed for listing in the future if not provided protection by the CVMSHCP. The goal of the CVMSHCP is to meet the Item Number: 4.

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Project Location
Rancho Descanso Project
Desert Hot Springs, CA
Project Boundary
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Feet °
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USGS Topographic Map
Rancho Descanso Project
Desert Hot Springs, CA
Project Boundary
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Biological Resources Assessment & MSHCP Compliance Report August 2021
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Biological Resources Assessment & MSHCP Compliance Report August 2021
6 requirements of the state and federal endangered species acts, while at the same time allowing for the economic growth (land development) within the CVMSHCP area without significant delay or hidden costs. Under the CVMSHCP, mitigation is required from all new development projects occurring in the CVMSHCP area for the purpose of assembling a preserve system for the covered species and natural vegetation communities within areas identified as having high conservation value.

Federal approval for the CVMSHCP was achieved under the Endangered Species Act (ESA or Act).

The USFWS and the National Marine Fisheries Service are the designated federal agencies accountable for administering the ESA. ESA defines species as “endangered” or “threatened” and provides regulatory protection at the federal level. Section 10(a) of the ESA authorizes the issuance of incidental take permits and establishes standards for the content of habitat conservation plans, such as the CVMSHCP.

State approval for the CVMSHCP was under the Natural Community Conservation Planning (NCCP) Program, managed by the CDFW. NCCPs are intended to conserve multiple species and their associated habitats, while also providing for compatible use of private lands. Through local planning, the NCCP planning process is designed to provide protection for wildlife and natural habitats before the environment becomes so fragmented or degraded by development that species listing are required under the California Endangered Species Act (CESA). Instead of conserving small, often isolated “islands” of habitat for just one listed species, agencies, local jurisdictions, and/or other interested parties have an opportunity through the NCCP to work cooperatively to develop plans that consider broad areas of land for conservation that would provide habitat for many species. Partners enroll in the programs and, by mutual consent, areas considered to have high conservation priorities or values are set aside and protected from development. Partners may also agree to study, monitor, and develop management plans for these high value “reserve” areas. The NCCP provides an avenue for fostering economic growth by allowing approved development in areas with lower conservation value. The Coachella Valley NCCP is included as a part of the CVMSHCP.

2.2 Protection of Migratory Birds

2.2.1 Migratory Bird Treaty Act
The Migratory Bird Treaty Act (MBTA) signed by the U.S., Great Britain, Mexico, Japan, and the countries of the former Soviet Union make it unlawful to pursue, capture, kill, and/or possess, or attempt to engage in any such conduct to any migratory bird, nest, egg or parts thereof listed in the MBTA document (USFWS 2018). The Secretary of the Interior can issue permits for incidental take of migratory bird species. As with the ESA, the MBTA also allows the Secretary of the Interior to grant permits for the incidental take of these protected migratory bird species.

The USFWS permit for the CVMSHCP allows only for the take of covered bird species which are also listed under the ESA, as amended and which are also listed under the MBTA. For other birds protected by the MBTA and not listed under the ESA no take is authorized (including killing and Item Number: 4.

Rancho Descanso Project
Biological Resources Assessment & MSHCP Compliance Report August 2021
7 wounding of any such birds or take of eggs and active nests). Take is defined as “to harass, harm, pursue, hunt, shoot, wound, kill, trap, capture, collect, or attempt to engage in such conduct.”

2.2.2 Section 3503, 3505.5, & 3513 of the State Fish and Game Code Section 3503 makes it unlawful to take, possess, or needlessly destroy the nest or eggs of any bird. Section 3505.5 makes it unlawful to take, possess, or destroy any birds in the order Falconiformes or Strigiformes (birds-of-prey, i.e.: owls, hawks, eagles, etc.) or to take, possess, or destroy the nest or eggs of any bird-of-prey. Section 3513 makes it unlawful to take or possess any migratory nongame bird as designated in the MBTA. See California Legislative Information (2021).

2.3 Waters of the United States and the State of California Impacts to federal and state jurisdictional waters are not covered by the CVMSHCP.

2.3.1 United States Army Corps of Engineers (USACE)
The USACE regulates the discharge of dredged or fill material in Waters of the United States (WUS) pursuant to Section 404 of the Clean Water Act (CWA).

2.3.2 Regional Water Quality Control Board (RWQCB)
The RWQCB regulates activities pursuant to Section 401(a)(1) of the CWA. Section 401 of the CWA specifies that certification from the State is required for any applicant requesting a federal license or permit to conduct any activity including, but not limited to, the construction or operation of facilities that may result in any discharge into navigable waters. Through the Porter Cologne Water Quality Control Act, the RWQCB asserts jurisdiction over Waters of the State of California (WSC) which is generally the same as WUS but may also include isolated waterbodies and areas of riparian vegetation. The Porter Cologne Act defines WSC as “surface water or ground water, including saline waters, within the boundaries of the state”.

2.3.3 California Department of Fish and Wildlife
The CDFW regulates water resources under Section 1600-1616 of the California Fish and Game Code. Section 1602 states:
“An entity may not substantially divert or obstruct the natural flow of, or substantially change or use any material from the bed, channel, or bank of, any river, stream, or lake, or deposit or dispose of debris, waste, or other material containing crumbled, flaked, or ground pavement where it may pass into any river, stream, or lake.” Item Number: 4.

Rancho Descanso Project
Biological Resources Assessment & MSHCP Compliance Report August 2021
8 3.0 METHODS

3.1 Literature Review
In preparation for the field visits, a literature search was conducted to identify special status biological resources known from the vicinity of the site. In the context of this report, and for the purpose of this assessment, vicinity is defined as areas within a five-mile radius of the site.

The literature review included the following documents and resources:
• California Natural Diversity Data Base (CNDDB) RareFind 5 (CDFW 2021a) • California Native Plant Society's (CNPS) Inventory of Rare, Threatened, and Endangered Plants of California (CNPS 2021)
• CVMSHCP (CVAG 2021)
• United States Department of Agriculture, Natural Resources Conservation Service (USDA NRCS). 2019. Web Soil Survey
• USGS 7.5’ Seven Palms Valley and Desert Hot Springs, Calif. quadrangles This document utilized the following standard references: for plant communities, the CVMSHCP (2021); for flora, the Jepson Flora Project (2021) and USDA NRCS PLANTS Database (2021a); for amphibians, reptiles, and mammals, CDFW (2016); and for birds, the California Bird Records Committee (2021).

3.2 Field Assessment
The field assessment visit was conducted on 18 August 2021 by Wood Senior Biologist John F.

Green. Suitable habitat was assessed based on the presence or absence of habitat components (e.g., soils, vegetation and topography) characteristic of the potentially occurring special status biological resources determined by the literature review to be potentially present. Pedestrian transects were walked around the entire site. All flora and fauna observed or otherwise detected (e.g., dead remains [primarily plants], vocalizations, presence of scat, tracks, and/or bones) during this assessment were recorded in field notes and are included in Appendices 2 and 3. Plant species of uncertain identity were photographed for identification. General weather and site conditions were also recorded at the beginning and end of the assessment. Temperatures and wind speeds were recorded with a handheld Kestrel anemometer. Temperatures during the morning visit ranged from 76 to 80 degrees Fahrenheit with winds from 2 to 7 miles per hour under mostly clear skies. Representative photos were taken (Appendix 4).

4.0 RESULTS
The project site is largely undeveloped, but not undisturbed. The approximate northern 2/3 of the site appears to be natural desert but is impacted by off-road vehicle usage and trash dumping.

The approximate southern 1/3 of the site was cleared in the past and is recovering. Historical aerial photography shows that structures were once present in part of this area as well as a probable pool or basin. Although all the structures are gone, an above-ground water pipeline which is presumed to be inoperative, and a basin remain. The basin may temporarily hold water during rain events. It appears that former roads to the structures may channel water in that direction. The Item Number: 4.

Rancho Descanso Project
Biological Resources Assessment & MSHCP Compliance Report August 2021
9 project site is surrounded by residential development on three sides: east, north, and south.

Natural desert, similar to that on the northern project site, is present to the west, continuing to the northwest across Palm Drive.

4.1 Topography and Soils
The project site is relatively flat, except for the previously noted basin. On-site elevation ranges from approximately 870 – 930 feet (265 – 285 meters) above mean sea level (Figure 2).

The Web Soil Survey (USDA, NRCS 2019) shows the following soil types on the site (Figure 3):
• Carsitas fine sand, 0 to 5 percent slopes
• Myoma fine sand, 0 - 5% slopes
Carsitas soils are very deep, somewhat excessively drained soils that formed in alluvium from granitoid and/or gneissic rocks. The Carsitas soils are on alluvial fans, fan aprons, valley fills, dissected remnants of alluvial fans and in drainageways. Slopes range from 0 to 30 percent (USDA NRCS 2021b).

Myoma soils are somewhat excessively drained with very slow runoff and rapid permeability. They are moderately alkaline fine and very fine sands which formed in sand blown from recent alluvium.

Slopes are level to rolling (USDA NRCS 2021b).

4.2 Hydrology / Jurisdictional Waters
No obvious natural washes were detected on-site, and none were mapped by the USGS. The previously noted basin and feeds to it were constructed. (Figure 4). There are drainage patterns along the shoulder of Rancho Descanso showing that residential runoff flows there from the paved street. Runoff may also be channeled there from unpaved Camino Campesino, but if so, vehicular usage has erased those patterns.

4.3 Vegetation
The entire site is vegetated by “Sonoran creosote bush scrub" as described by the CVMSHCP, however we are designating the southern portion which was cleared and/or disturbed in the past as "recovering Sonoran creosote bush scrub" (Figure 4).

Only 20 species of plants were detected, as most annuals are not detectable in August. Short-term biological studies of this nature are limited by the seasonality of plants and the timing of field visits A list of all plant species, including common and scientific names, is attached (Appendix 2).

Almost half (9) of the plants detected were not native. Horticultural species planted around the developed periphery of the site were not included.

Item Number: 4.

Project Boundaries
CkB- Carsitas fine sand, 0 to 5
percent slopes
MaB- Myoma fine sand, 0 to 5
percent slopes
1 inch = 150 feet
° 0 150
Feet
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FIGURE 3
Soil Types
Rancho Descanso Project
Desert Hot Springs, CA
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Recovering Sonoran creosote
bush scrub
Sonoran creosote bush scrub
1 inch = 150 feet
° 0 150
Feet
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FIGURE 4
Vegetation Communities
Rancho Descanso Project
Desert Hot Springs, CA
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Biological Resources Assessment & MSHCP Compliance Report August 2021
14 4.4 CVMSHCP Conservation Areas
The project site is not within or adjacent to any CVMSHCP conservation areas.

4.5 Wildlife
Vertebrate wildlife directly observed and/or detected otherwise (e.g., scat, bones, prints, feathers, burrows, etc.) during the survey included a minimum of 13 species. This included one reptile, nine birds and at least three mammals. See Appendix 3 for a complete list of all wildlife species detected.

It should be noted that short-term biological studies of this nature are limited by seasonality (for example migratory birds and “hibernating” mammals and reptiles), the fossorial and nocturnal habits of many mammals and reptiles, and the timing of field surveys. A complete inventory of the wildlife on the site would require extensive year-round surveys for amphibians, reptiles, birds, and mammals including, for example: pitfall traps for amphibians and reptiles, and live trapping and/or the placement of tracking stations for the detection of nocturnal mammals.

4.6 Special status Elements
Plant or animal taxa may be considered "sensitive" or as having “special status” due to declining populations, vulnerability to habitat change, or because they have restricted ranges. Some are listed as threatened or endangered by the USFWS or by the CDFW and are protected by the federal and state ESAs. Others have been identified as sensitive or as special status species by the USFWS, the CDFW, or by private conservation organizations, including the CNPS. Unlisted sensitive species do not have formal state or federal status but may nevertheless be considered significant.

Knowledge of habitat associations, natural history, seasonality, and distribution is essential in the assessment of the potential for occurrence of the various sensitive plants and animals known to occur throughout the region. For these reasons, special status species that were not observed on the site have the potential to occur based on their geographic distribution, habitat preferences, and the regional location of the site. Tables 1-5 below summarize sensitive species known to occur in the vicinity of the site and include their potential occurrence status on the site based on the best available information and the collective expertise of Wood biologists.

The CVMSHCP provides conservation for 27 imperiled plant and animal species and 27 natural communities (vegetation). These include federal and state-listed species, federal and state species of concern, and species on the CNPS rare plant species lists. The CVMSHCP has created modeled habitat polygons for many of those species. No modeled habitat is present within the project site.

Several special status species, not covered by the CVMSHCP, may also potentially occur on-site.

The literature review and biological resources assessment resulted in the identification of 27 special status elements which were either observed on the site, had CNDDB records within an approximate five-mile radius of the site, and/or which had habitat on the site. These included 11 plants, one vegetation community, four reptiles, six birds, and five mammals. Tables 1 through 5 provide a complete list of these sensitive biological resources, their associated status, their general Item Number: 4.

Rancho Descanso Project
Biological Resources Assessment & MSHCP Compliance Report August 2021
15 habitat associations, and their respective site occurrence potential based on geographic distribution and presence of potentially suitable habitat.

Table 1. Special status Plants
Species Status Habitat Probability
Abronia villosa var. aurita
chaparral sand-verbena
CVMSHCP = No
F = ND
C = S2
CNPS = 1B.1
Desert dunes, sandy areas in
chaparral & coastal scrub. 75
to 1600 meters (m.). Blooms
(B): January – September.

Absent
No suitable habitat.

Variety villosa, which is
not a special status
species, expected here.

Astragalus lentiginosus var.
coachellae
Coachella Valley milk-vetch
CVMSHCP = Yes
F = END
C = S1
CNPS = 1B.2
Sonoran scrub; sandy flats,
washes, outwash fans,
sometimes on dunes. 40 to
665 m. B: January -
September
Moderate
Multiple records and
USFWS designated critical
habitat within 0.5 mile.

Dodecahema leptoceras
slender-horned spineflower
CVMSHCP = No
F = END
C = END, S1
CNPS = 1B.1
Chaparral, cismontane
woodland, coastal scrub.
200 to 760 m. B: April – June.

Absent
No suitable habitat
Eriastrum harwoodii
Harwood's eriastrum
CVMSHCP = No
F = ND
C = S2
CNPS = 1B.2
Desert dunes. 125 to 915 m.

B: March-June.

Absent
No suitable habitat
Euphorbia arizonica
Arizona spurge
CVMSHCP = No
F = ND
C = S3
CNPS = 2B.2
Sonoran desert scrub. 50 –
300 m. B: March - April
Moderate
Habitat suitable
Euphorbia misera
cliff spurge
CVMSHCP = No
F = ND
C = S2
CNPS = 2B.3
Coastal bluff scrub, coastal
scrub, Mojavean desert
scrub. 10 – 500 m. B:
(October) December -
August
Absent
No suitable habitat, local
population believed to be
extirpated
Galium angustifolium ssp.
gracillimum
slender bedstraw
CVMSHCP = No
F = ND
C = S4
CNPS = 4.2
Joshua tree woodland,
Sonoran desert scrub. 130 –
1,550 m. B: April – June (July)
Moderate
Habitat suitable
Linanthus maculatus
Little San Bernardino Mountains
linanthus
CVMSHCP = Yes
F = ND
C = S2
CNPS = 1B.2
Desert dunes, Joshua tree
woodland, Mojavean desert
scrub, and Sonoran desert
scrub. 140 to 1,220 m. March
- May
Moderate
Habitat suitable
Item Number: 4.

Rancho Descanso Project
Biological Resources Assessment & MSHCP Compliance Report August 2021
16 Table 1. Special status Plants
Species Status Habitat Probability
Mentzelia tricuspis
spiny-hair blazing star
CVMSHCP = No
F = ND
C = S4
CNPS = 4.2
Mojavean desert scrub. 150
– 1,280 m. B: March – May
Low
Desert scrub present
Nemacaulis denudata var. gracilis
slender cottonheads
CVMSHCP = No
F = ND
C = S2
CNPS = 2B.2
Sandy places in coastal
dunes, desert dunes, &
Sonoran desert scrub. –50 to
400 m. B: March - May
Moderate
Habitat suitable
Selaginella eremophila
desert spike-moss
CVMSHCP = No
F = ND
C = S2S3
CNPS = 2B.2
Chaparral and gravelly or
rocky Sonoran desert scrub.
200 to 900 m. B: (May) June
(July).

Absent
No suitable habitat
Table 2. Special status Vegetation Communities
Community Status Habitat Probability
Desert Fan Palm Oasis Woodland
CVMSHCP = Yes
F = ND
C = S3.2
Not applicable
Absent
No palms on-site.

Table 3. Special status Reptiles
Species Status Habitat Probability
Crotalus ruber
Red-diamond rattlesnake
CVMSHCP = No
F: None
C: SSC, S3
Chaparral, woodland,
grassland, & desert areas.

Occurs in rocky areas and
dense vegetation. Needs
rodent burrows, cracks in
rocks or surface cover
objects.

Absent
No suitable habitat.

Gopherus agassizii
Desert tortoise
CVMSHCP = Yes
F = THR
C =THR, S2S3
Inhabits desert
environments including
sandy dunes, washes, desert
flats and hillsides. Requires
firm ground to dig burrows.

Low
Suitable habitat present,
but site is outside of
known occupied areas in
the Coachella Valley
Item Number: 4.

Rancho Descanso Project
Biological Resources Assessment & MSHCP Compliance Report August 2021
17 Table 3. Special status Reptiles
Phrynosoma mcallii
flat-tailed horned lizard
CVMSHCP = Yes
F = ND
C =SSC, S2
Restricted to desert washes
and desert flats; requires
vegetative cover, ants, and
fine sand.

Absent
Isolated patch of marginal
habitat insufficient to
sustain a population,
species believed to be
extirpated from this area.

Uma inornata
Coachella Valley fringe-toed
lizard
CVMSHCP = Yes
F = THR
C = END, S1
Requires fine, loose,
windblown sand
interspersed with hardpan
and widely spaced desert
shrubs.

Absent
Habitat unsuitable.

Table 4. Special status Birds
Species Status Habitat Probability
Athene cunicularia
burrowing owl
CVMSHCP = Yes*
F = MBTA, BCC
C = SSC, S2
Open, dry annual or
perennial grassland, deserts
& scrublands characterized
by low-growing vegetation.

Burrows essential.

Occurs
At least one adult pair onsite.

Calypte costae
Costa's hummingbird
CVMSHCP = No
F = MBTA, BCC
C = S4
Primary habitats are desert
wash, edges of desert
riparian and valley foothill
riparian, coastal scrub,
desert scrub, desert
succulent shrub, lowerelevation chaparral, and
palm oasis.

Moderate
Nesting and foraging
habitat on-site.

Falco mexicanus
prairie falcon
CVMSHCP = No
F = MBTA, BCC
C = SSC, S3
Breeding sites located on
cliffs, but forages far afield.

Low
No nesting habitat,
potential for foraging
only.

Lanius ludovicianus
loggerhead shrike
CVMSHCP = No
F = MBTA, BCC
C = SSC, S4
Found in open habitats with
widely spaced vegetation.

Moderate
Nesting and foraging
habitat on-site.

Vireo bellii pusillus
least Bell’s vireo
CVMSHCP = Yes*
F: Endangered, MBTA
C: Endangered, S2
Inhabits riparian forests and
willow thickets.

Absent
No riparian habitat
Toxostoma lecontei
LeConte’s thrasher
CVMSHCP = Yes*
F = MBTA, BCC
C = SSC (San Joaquin
population only), S3
Primarily utilizes open desert
washes, desert scrub, alkali
desert scrub, and desert
succulent scrub habitats;
commonly nests in a dense,
spiny shrub or densely
branched cactus.

Low
Suitable habitat and
nesting substrate, but
proximity to existing
residences an issue.
* Species is to be conserved under the CVMSHCP, but is still protected by the MBTA Item Number: 4.

Rancho Descanso Project
Biological Resources Assessment & MSHCP Compliance Report August 2021
18 Table 5. Special status Mammals
Species Status Habitat Probability
Chaetodipus fallax pallidus
pallid San Diego pocket mouse
CVMSHCP = No
F = None
C = SSC, S3S4
Found in desert shrublands,
slopes, and rocky areas
along southern margins of
Mojave Desert and along
northern slopes of San
Bernardino Mountains.

Absent
Site out of range of the
subspecies.

Neotoma lepida intermedia
San Diego desert woodrat
CVMSHCP = No
F = ND
C = SSC, S3S4
The subspecies “intermedia”
is a coastal slope resident.

Coastal sage scrub and
chaparral with rock outcrops,
boulders, cactus patches, or
dense undergrowth.

Absent
No suitable habitat, site is
outside the expected
range of the subspecies.

Perognathus longimembris bangsi
Palm Springs pocket mouse
CVMSHCP = Yes
F = None
C = SSC, S2
Inhabits flat or gently
sloping areas with sparse
vegetative cover and packed
or sandy soils.

High
Habitat suitable, recorded
within one mile.

Ovis canadensis nelsoni
desert bighorn sheep
CVMSHCP = No
F = ND
C = FP, S3
Species' range defined in
vicinity of the study area by
mountain range complexes,
where the species is adept at
using steep, rocky terrain to
escape predators.

Absent
No suitable habitat
Xerospermophilus tereticaudus
chlorus
Coachella Valley (Palm Springs)
round-tailed ground squirrel
CVMSHCP = Yes
F = None
C = SSC, S1S2
Prefers open, flat, grassy
areas in fine-textured, sandy
soil in desert succulent
scrub, desert wash, desert
scrub, alkali scrub, & levees.

Low
No CNDDB records but
known by Wood
biologists to occur in the
area.

Definitions of status designations and occurrence probabilities for Tables 1-6 Definitions of occurrence probability:

Occurs: Observed on-site by Wood personnel or recently reported on-site by another reliable source.

High:Observed in similar habitat in region by qualified biologists, or habitat on-site is a type often utilized by the species and the site is within the known range of the species.

Moderate:Reported sightings in surrounding region, or site is within the known range of the species and habitat onsite is a type occasionally used by the species.

Low: Site is within the known range of the species but habitat on-site is rarely used by the species

Absent:A focused study failed to detect the species, suitable habitat not present, or site is outside the geographic distribution of the species.

Unknown:No focused surveys have been performed in the region, species' distribution and habitat are poorly known.

CVMSHCP designations
Yes: Conserved by the CVMSHCP
No: Not Specifically Conserved by the CVMSHCP
Considered: Considered, but not included in the CVMSHCP Federal designations: (F = federal Endangered Species Act or USFWS designations) END:Federally listed, Endangered
THR:Federally listed, Threatened
CAN:Candidate for Federal listing
MBTA: Migratory Bird Treaty Act
BEPA:Bald Eagle Protection Act (also protects Golden Eagles) BCC:Birds of Conservation Concern
Item Number: 4.

Rancho Descanso Project
Biological Resources Assessment & MSHCP Compliance Report August 2021
19 ND:No designation
State designations: (C = California Endangered Species Act or CDFW designations) END:State listed, Endangered
THR:State listed, Threatened
CAN:Candidate for State listing
RARE:State listed, Rare
FP:Fully Protected Species
SSC:Species of Special Concern
WL:Watch List Species
ND:No designation
CDFW state rankings are a reflection of the overall condition of an element throughout its California range. The number after the decimal point represents a threat designation attached to the rank:

S1 = Critically Imperiled. Less than (<) 6 Element Occurrences (EOs) OR < 1,000 individuals OR < 2,000 acres S1.1 = very threatened
S1.2 = threatened
S1.3 = no current threats known
S2 = Imperiled. 6-20 EOs OR 1,000-3,000 individuals OR 2,000-10,000 acres S2.1 = very threatened
S2.2 = threatened
S2.3 = no current threats known
S3 = Vulnerable. 21-80 EOs OR 3,000-10,000 individuals OR 10,000-50,000 acres S3.1 = very threatened
S3.2 = threatened
S3.3 = no current threats known
S4 = Apparently Secure. Uncommon but not rare in the state; some cause for long-term concern.

S5 = Secure. Common, widespread, and abundant in the state.

SH = All known California sites are historical, not extant California Native Plant Society (CNPS) designations:

Primary Categories
LIST 1A: Plants Presumed Extirpated in California and Either Rare or Extinct Elsewhere LIST 1B: Plants Rare, Threatened, or Endangered in California and Elsewhere LIST 2A: Plants Presumed Extirpated in California, But Common Elsewhere LIST 2B: Plants Rare, Threatened, or Endangered in California, But More Common Elsewhere LIST 3: Plants About Which More Information is Needed - A Review List LIST 4: Plants of Limited Distribution - A Watch List
Subdivisions within Categories

0.1: Seriously threatened in California

0.2: Moderately threatened in California

0.3: Not very threatened in California
Item Number: 4.

Rancho Descanso Project
Biological Resources Assessment & MSHCP Compliance Report August 2021
20 5.0 DISCUSSION AND RECOMMENDATIONS

5.1 Hydrology / Jurisdictional Waters
“Waters” on-site appear to result from sheet flow following rain events entering the site as a result of both off-site and on-site anthropomorphic alterations to the topography (i.e. construction of impermeable surfaces including paved roads and houses, and construction of unpaved roads and a basin). They are not expected to be considered jurisdictional by the USACE, CDFW, and/or the RWQCB.

5.2 Special status Elements Tables
Of the 27 special status elements identified as occurring or potentially occuring in the site vicinity (Tables 1-5), 13 were determined to be absent. Since they are not expected to occur on-site or to be impacted, those 13 will not be discussed further.

Of the remaining 14 species which are considered to have some occurrence potential, five are conserved through participation in the CVMSHCP: Coachella Valley milk-vetch, Little San Bernardino Mountains linanthus, desert tortoise, Palm Springs pocket mouse, and Coachella Valley (Palm Springs) round-tailed ground squirrel. Potential impacts to four of those species will be fully covered through participation in the CVMSHCP, so they will not be discussed further. The desert tortoise is covered, but if detected on-site relocation of individual tortoises is required.

This must be done by an authorized biologist with CDFW/USFWS approval. The remaining nine species are discussed below.

5.2.1 Plants and Vegetation
Four special status plant species not covered by the CVMSHCP have a low to moderate probability of occurrence on-site: Arizona spurge, slender bedstraw, spiny-hair blazing star, and slender cottonheads. Because some are categorized as S2 or 2B species, which is the rough equivalent of “threatened” under CEQA, a focused plant survey is recommended. A survey in April would capture the blooming period of all these species. If present, topsoil and/or seed collection could preserve representatives of the population(s).

5.2.2 Burrowing Owl
The burrowing owl is a covered species under the CVMSHCP, but the federal permit for the CVMSHCP does not allow take of this species under the MBTA. This species nests and roosts underground and is thus particularly vulnerable to ground disturbing activities. At least one pair of adult burrowing owls is present on-site and eggs or young may be in their burrow. This has been reported to CDFW as required by our permits. To avoid take of the burrowing owl and the “CDFW recommends two take avoidance surveys. The first should occur between 14 and 30 days prior to ground disturbance and the second within 24 hours of ground disturbance” (CDFG 2012, CDFW 2014). Since burrowing owls are already known to be present, we recommend consultation with the CDFW now to discuss options for relocation.

Item Number: 4.

Rancho Descanso Project
Biological Resources Assessment & MSHCP Compliance Report August 2021
21 5.2.3 Other Special status Bird Species
Prairie falcon is a special status species not covered by the CVMSHCP which could occur as a forager, but no nesting habitat is available on-site. Although there would be an incremental loss of foraging habitat, no action is required regarding this species. Costa’s hummingbird and loggerhead shrike are special status species which may nest on-site and in the project area. They are not covered by the CVMSHCP. LeConte’s thrasher may nest on-site and in the project area and it is covered by the CVMSHCP, but still cannot be impacted while nesting. All are protected from take while nesting by the MBTA and state code. Nesting bird surveys will prevent impacts to these species. This will be discussed further below.

5.3 Migratory Bird Treaty Act (MBTA) and State Code
Excluded from coverage under the CVMSHCP are a variety of common bird species that are protected by the MBTA and state code. This includes virtually all native migratory and resident bird species, including many of the birds already known to occur in the vicinity (Appendix 3).

Avoidance of impacts to nesting migratory and resident birds is a requirement of the federal permit issued for the CVMSHCP. In order to avoid impacting nesting birds, either avoidance of project-related disturbance during the nesting season (generally from approximately 1 February to 31 August) or nesting bird surveys conducted by a qualified ornithologist or biologist immediately prior to site disturbance during the nesting season would be required. This would detect nesting special status species as well. If nesting birds are present, no work would be permitted near the nest until young have fledged. While there is no established protocol for nest avoidance, when consulted, the CDFW generally recommends avoidance buffers of about 500 feet for birds-of-prey and listed species, and 100 – 300 feet for other birds.

5.4 CVMSHCP Plan Consistency
The site is not within or adjacent to any CVMSHCP conservation area, so will not interfere with any conservation area objectives and there will be no edge effects to conservation areas. No wildlife corridors or biological linkages are mapped, known, or expected on-site, so there will be no effects to them.

6.0 CONCLUSION
Implementation of the proposed project would result in permanent impacts to the project site (see Appendix 1) including the biological resources occurring or potentially occurring in the impacted area. Project impacts will be mitigated through participation in the CVMSHCP and adherence to the recommendations above. CVMSHCP landscaping suggestions are included in Appendices 5 and 6.

With the implementation of the recommendations in this report, impacts to special status species potentially occurring in the project area and their habitats would be expected to be less than significant. Recommendations include surveys and consultation as needed for rare plants, the burrowing owl, and nesting birds.

Item Number: 4.

Rancho Descanso Project
Biological Resources Assessment & MSHCP Compliance Report August 2021
22 7.0 LITERATURE CITED AND REFERENCES
California Bird Records Committee. 2021. Official California Checklist. Accessed online at:
http://californiabirds.org/ca_list.asp
California Department of Fish and Game (CDFG). 2012. Staff Report on Burrowing Owl Mitigation.

March 7.

California Department of Fish and Wildlife (CDFW). 2021a. California Natural Diversity Database (CNDDB) RareFind 5 records of sensitive elements.

CDFW. 2021b. Special Animals List. July. Periodic publication. Sacramento, CA. Accessed online at:
https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=109406&inline CDFW. 2016. Complete List of Amphibian, Reptile, Bird and Mammal Species in California. May.

Accessed online at: https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=87155&inline CDFW. 2014. Email to Amec Foster Wheeler from Karen Riesz, CDFW Environmental Scientist, regarding CDFW recommendations for burrowing owl take avoidance within nonconservation areas in the CVMSHCP area. December 7th.

California Legislative Information. 2021. Fish and Game Code of California. http://leginfo.legislature.ca.gov/faces/codesTOCSelected.xhtml?tocCode=FGC&tocTitle= +Fish+and+Game+Code+-+FGC
California Native Plant Society (CNPS). 2021. Inventory of Rare, Threatened, and Endangered Plants of California. Accessed online at: http://www.rareplants.cnps.org Coachella Valley Association of Governments (CVAG). 2021. Coachella Valley Multiple Species Habitat Conservation Plan, including Major Amendment. Accessed online at: cvmshcp.org Jepson Flora Project. 2021. Jepson eFlora. Accessed online at:
http://ucjeps.berkeley.edu/IJM.html
Riverside County Information Technology. 2021. Map My County. Accessed online at:
https://gis1.countyofriverside.us/Html5Viewer/index.html?viewer=MMC_Public United States Department of Agriculture, Natural Resources Conservation Service (USDA NRCS). 2021a. The PLANTS Database. National Plant Data Team. Accessed online at:
https://plants.usda.gov/java/
USDA NRCS. 2021b. Web Site for Official Soil Series Descriptions and Series Classification.

Accessed online at: https://soilseries.sc.egov.usda.gov/ USDA NRCS. 2019. Web Soil Survey. Accessed online at: http://websoilsurvey.nrcs.usda.gov/app/ United States Fish and Wildlife Service (USFWS). 2021. Bird Laws and Treaties. Accessed online at: http://www.fws.gov/migratorybirds/RegulationsandPolicies.html Item Number: 4.

Rancho Descanso Project
Biological Resources Assessment & MSHCP Compliance Report August 2021
0 APPENDIX 1

PRELIMINARY SITE PLAN
Item Number: 4.

30' WIDE

SEWER &
WATER

EASEMENT
30' WIDE EVA ACCESS
6 5 4 3 2 1
7 8
9 10
11 12
13 14
15 17
16 18 19 20 21 22 23 24 25 26 RETENTION BASIN
35 34 33 32 31 30 29 28 27
36 37 38 39 40 41 42 43 44
53 52 51 50 49 48 47 46 45
54 55 56 PARK 57 58 59 60
61 62
63 64
65 66
67 68
69 76 75 74 73 72 71 70
PARCEL "B"
LLA 21-
PARCEL "C"
LLA 21-

CAMINO CAMPESINO
PROP. 6" CURB
& GUTTER
PROP. 5' WIDE

SIDEWALK
EX. 8" VCP TO BE
REPLACED W/ 8" D.I.P. PROP. 6' GARDEN WALL
PROP. 6'

GARDEN WALL
EXIST. BOUNDARY
PROP. BOUNDARY PROP. 6' GARDEN WALL PROP. 6" CURB & GUTTER PROP. 5' WIDE SIDEWALK EXIST. BOUNDARY PROP. BOUNDARY PROP. 6' GARDEN WALL 60' 120'
SCALE:

H: V:

OF SHTS
1"=50' N/A
HEI

C O N S U L T I N G
TEC
w w w . h e i t e c i n c . c o m
Suite 309
777 East Tahquitz Canyon Way
Palm Springs, California 92262
Phone: 760.340.9060
"RANCHO DESCANSO"

DESERT HOT SPRINGS
TENTATIVE TRACT MAP 38200
AUGUST 2, 2021
PROP. 8" V.C.P.

SEWER MAIN

NORTH OR

EAST R/W

SOUTH OR

WEST R/W
A.C.

PVMT.

PROP. 8" D.I.P.

WATER MAIN
PROP.

WEDGE

CURB BASE COURSE

COMPACTED

SUBGRADE
NORTH
R/W
SOUTH
R/W
WEST
R/W
EX. 8" P.V.C. TO BE
REPLACED W/ 8" D.I.P.

WATER MAIN
A.C.

PVMT.

BASE COURSE

COMPACTED

SUBGRADE
PROP. 6" CURB
& 24" GUTTER
PROP. 6'

BLOCK WALL
EXIST.

BLOCK WALL
EX. 8" V.C.P.

SEWER MAIN
EX. A.C.

PVMT.

EAST
R/W
EX. 8" D.I.P.

WATER MAIN
PROP. A.C.

PVMT.

PROP. 6" CURB
& 24" GUTTER

BASE COURSE

COMPACTED

SUBGRADE
PROP. 6'
BLOCK
WALL
EX. GROUND
LOT #
5' 10' 20'
5'
PROP. 6" CURB
& 24" GUTTER
Item Number: 4.

Rancho Descanso Project
Biological Resources Assessment & MSHCP Compliance Report August 2021
APPENDIX 2
SPECIES LIST: VASCULAR PLANTS
Item Number: 4.

Rancho Descanso Project
Biological Resources Assessment & MSHCP Compliance Report August 2021
Species List: Vascular Plants
This list reports only plants observed on-site by this study. Other species may have been overlooked or undetectable due to their growing season. * = non-native species, sp. = identified only to genus, †= special status species, spp. = two or more species, cf = compares favorably with, var. = variety, ssp. = subspecies

GYMNOSPERMAE CONIFEROUS PLANTS
Ephedraceae Ephedra Family
Ephedra-sp. Mormon tea

ANGIOSPERMAE FLOWERING PLANTS

DICOTYLEDON DICOT FLOWERING PLANTS
Asteraceae Sunflower Family
Ambrosia acanthicarpa annual bur-sage
Ambrosia dumosa white bur-sage
Dicoria canescens desert twinbugs
Brassicaceae Mustard Family
*Brassica tournefortii Sahara mustard
Boraginaceae Borage Family
Tiquilia plicata fan-leaved tiquilia
Cactaceae Cactus Family
Cylindropuntia echinocarpa silver cholla
Chenopodiaceae Goosefoot Family
*Salsola tragus Russian thistle
Euphorbiaceae Spurge Family
Croton californicus California croton
Euphorbia polycarpa smallseed sandmat
Fabaceae Pea Family
Psorothamnus emoryi dyebush
Portulacaceae Purslane Family
*Portulaca oleracea purslane
Zygophyllaceae Caltrop Family
Larrea tridentata creosote bush
*Tribulus terrestris caltrop
Item Number: 4.

Rancho Descanso Project
Biological Resources Assessment & MSHCP Compliance Report August 2021

MONOCOTYLEDONS MONOCOT FLOWERING PLANTS
Poaceae Grass Family
*Cenchrus echinatus southern sandbur
*Cynodon dactylon Bermuda grass
Hilaria rigida big galleta
*Pennisetum setaceum crimson fountain grass
*Poa annua annual blue grass
*Schismus sp. Mediterranean grass
Item Number: 4.

Rancho Descanso Project
Biological Resources Assessment & MSHCP Compliance Report August 2021
APPENDIX 3
SPECIES LIST: ANIMALS
Item Number: 4.

Rancho Descanso Project
Biological Resources Assessment & MSHCP Compliance Report August 2021
Species List: Animals
This list reports only animals observed by this study. Other species may have been overlooked or undetectable due to their activity patterns or weather conditions. †= special status species, * = non-native species, sp. = identified only to genus, spp. = two or more species, cf = compares favorably with.

REPTILIA REPTILES
Phrynosomatidae Spiny Lizards
Uta stansburiana common side-blotched lizard

AVES BIRDS
Columbidae Pigeons and Doves
*Columba livia rock pigeon
*Streptopelia decaocto Eurasian collared-dove
Zenaida macroura mourning dove
Strigidae Typical Owls
†Athene cunicularia burrowing owl
Falconidae Caracaras and Falcons
Falco sparverius American kestrel
Corvidae Crows and Jays
Corvus corax common raven
Remizidae Penduline Tits and Verdins
Auriparus flaviceps verdin
Mimidae Mockingbirds and Thrashers
Mimus polyglottos northern mockingbird
Cardinalidae Cardinals and Allies
Passerina amoena Lazuli Bunting

MAMMALIA MAMMALS
Rodentia Rodents
≥ two species multiple burrows of different sizes
Sciuridae Squirrels, Chipmunks and Marmots
Ostospermophilus beecheyi California ground squirrel
Item Number: 4.

Rancho Descanso Project
Biological Resources Assessment & MSHCP Compliance Report August 2021
APPENDIX 4

PHOTOGRAPHIC EXHIBITS
Item Number: 4.

Rancho Descanso Project
Biological Resources Assessment & MSHCP Compliance Report August 2021
Photo 1. Looking Southeast (SE) from northwest (NW) site corner at Sonoran creosote bush scrub and off-road vehicle damage.

Photo 2. View east from west site boundary at interface between Sonoran creosote bush scrub (left) and recovering Sonoran creosote bush scrub (right).

Item Number: 4.

Rancho Descanso Project
Biological Resources Assessment & MSHCP Compliance Report August 2021
Photo 3. Looking northeast (NE) from southwest (SW) site corner at recovering Sonoran creosote bush scrub.

Photo 4. View SW within recovering Sonoran creosote bush scrub in southern site.

View of apparently created basin & assumed associated water infrastructure.

Item Number: 4.

Rancho Descanso Project
Biological Resources Assessment & MSHCP Compliance Report August 2021
Photo 5. Looking north from SE site corner at recovering Sonoran creosote bush scrub, adjacent residential, and windblown trash.

Photo 6. Looking SW from NE site corner at Sonoran creosote bush scrub, adjacent residential development, and gutter & drain which feed water onto site.

Item Number: 4.

Rancho Descanso Project
Biological Resources Assessment & MSHCP Compliance Report August 2021
Photo 7. Drainage fed by paved Avenida Descanso (left) and possibly also by unpaved Camino Campesino (right).

Photo 8. One of at least two burrowing owls on-site.

Item Number: 4.

Rancho Descanso Project
Biological Resources Assessment & MSHCP Compliance Report August 2021
APPENDIX 5

COACHELLA VALLEY NATIVE PLANTS RECOMMENDED FOR LANDSCAPING Item Number: 4.

Rancho Descanso Project
Biological Resources Assessment & MSHCP Compliance Report August 2021

COACHELLA VALLEY NATIVE PLANTS RECOMMENDED FOR LANDSCAPING Note: Many of the following scientific names have undergone taxonomic changes in recent years. Refer to Jepson Flora Project (2021).

BOTANICAL NAME COMMON NAME
Trees
Washingtonia filifera California fan palm
Cercidium floridum blue palo verde
Chilopsis linearis desert willow
Olneya tesota ironwood tree
Prosopis glandulosa var. torreyana honey mesquite
Shrubs
Acacia greggii cat’s claw acacia
Ambrosia dumosa burro bush
Atriplex canescens four wing saltbush
Atriplex lentiformis quailbush
Atriplex polycarpa cattle spinach
Baccharis sergiloides squaw water-weed
Bebia juncea sweet bush
Cassia (Senna) covesii desert senna
Condalia parryi crucilllo
Crossosoma bigelovii crossosoma
Dalea emoryi dye weed
Dalea (Psorothamnus) schottii indigo bush
Datura meteloides jimson weed
Encelia farinosa brittle bush
Ephedra aspera Mormon tea
Eriogonum fasciculatum California buckwheat
Eriogonum wrightii membranaceum Wright’s buckwheat
Fagonia laevis no common name
Gutierrezia sarothrae matchweed
Haplopappus acradenius goldenbush
Hibiscus denudatus desert hibiscus
Hoffmannseggia microphylla rush pea
Hymenoclea salsola cheesebush
Hyptis emoryi desert lavender
Isomeris arborea bladder pod
Juniperus californica California juniper
Krameria grayi ratany
Krameria parvifolia little-leaved ratany
Larrea tridentata creosote bush
Item Number: 4.

Rancho Descanso Project
Biological Resources Assessment & MSHCP Compliance Report August 2021

BOTANICAL NAME COMMON NAME
Lotus rigidus desert rock pea
Lycium andersonii box thorn
Petalonyx linearis long-leaved sandpaper plant
Petalonyx thurberi sandpaper plant
Peucephyllum schottii pygmy cedar
Prunus fremontii desert apricot
Rhus ovata sugar-bush
Salazaria mexicana paper-bag bush
Salvia apiana white sage
Salvia eremostachya Santa Rosa sage
Salvia vaseyi wand sage
Simmondsia chinensis jojoba
Sphaeralcia ambigua desert mallow
Sphaeralcia ambigua rosacea apricot mallow
Trixis californica trixis
Zauschneria californica California fuchsia
Groundcovers
Mirabilis bigelovii wishbone bush
Mirabilis tenuiloba white four o’clock
Vines
Vitis girdiana desert grape
Accent
Muhlenbergia rigens deer grass
Herbaceous Perennials
Adiantum capillus-veneris maiden-hair fern (w)
Carex alma sedge (w)
Dalea parryi Parry dalea (w)
Eleocharis montevidensis spike rush (w)
Equisetum laevigatum horsetail (w)
Juncus bufonis toad rush (w)
Juncus effuses juncus (w)
Juncus macrophyllus juncus (w)
Juncus mexicanus Mexican rush (w)
Juncus xiphioides juncus (w)
Notholaena parryi Parry cloak fern
Pallaea mucronata bird-foot fern
Item Number: 4.

Rancho Descanso Project
Biological Resources Assessment & MSHCP Compliance Report August 2021

BOTANICAL NAME COMMON NAME
Cacti and Succulents
Agave deserti desert agave
Asclepias albicans desert milkweed
Asclepias subulata ajamete
Dudleya arizonica live-forever
Dudleya saxosa rock dudleya
Echinocereus engelmannii calico hedgehog cactus
Ferocactus acanthodes barrel cactus
Fouquieria splendens ocotillo
Mamillaria dioica nipple cactus
Mamillaria tetrancistra corkseed cactus
Nolina parryi Parry nolina
Opuntia acanthocarpa stag-horn cholla
Opuntia bigelovii teddy bear or jumping cholla
Opuntia basilaris beavertail cactus
Opuntia echinocarpa silver or golden cholla
Opuntia ramosissima pencil cholla
Yucca schidigera Mojave yucca, Spanish dagger
Yucca whipplei our Lord’s candle
Item Number: 4.

Rancho Descanso Project
Biological Resources Assessment & MSHCP Compliance Report August 2021
APPENDIX 6

PROHIBITED INVASIVE ORNAMENTAL PLANTS
Item Number: 4.

Rancho Descanso Project
Biological Resources Assessment & MSHCP Compliance Report August 2021

PROHIBITED INVASIVE ORNAMENTAL PLANTS

BOTANICAL NAME COMMON NAME
Acacia spp. (all species except A. greggii) acacia (all species except native catclaw acacia)
Arundo donax1 giant reed
Atriplex semibaccata1 Australian saltbush
Avena barbata slender wild oat
Avena fatua wild oat
Brassica tournefortii2 African or Saharan mustard
Bromus madritensis ssp. rubens1 red brome
Bromus tectorum2 cheat grass
Cortaderia jubata [syn.C. atacamensis] Jubata crass or Andean pampas grass Cortaderia dioica [syn. C. selloana] pampas grass
Descurainia sophia tansy mustard
Eichhornia crassipes water hyacinth
Elaegnus angustifolia Russian olive
Foeniculum vulgare sweet fennel
Hirschfeldia incana short-pod mustard
Lepidium latifolium perennial pepperweed
Lolium multiflorum Italian ryegrass
Nerium oleander oleander
Nicotiana glauca1 tree tobacco
Oenothera berlandieri3 Mexican evening primrose
Olea europea European olive tree
Parkinsonia aculeata1 Mexican palo verde
Pennisetum clandestinum Kikuyu grass
Pennisetum setaceum2 fountain grass
Phoenix canariensis3 Canary Island date palm
Phoenix dactylifera3 date palm
Ricinus communis1 castorbean
Salsola tragus1 Russian thistle
Schinus molle Peruvian pepper tree
Schinus terebinthifolius Brazilian pepper tree
Schismus arabicus Mediterranean grass
Schismus barbatus2 Saharan grass
Stipa capensis2 no common name
Tamarix spp. (all species)2 tamarisk or salt cedar
Taeniatherum caput-medusae Medusa-head
Tribulus terrestris puncturevine
Vinca major periwinkle
Washingtonia robusta Mexican fan palm
Yucca gloriosa3 Spanish dagger
Item Number: 4.