A - Addendum to the Santa Maria Regional Landfill Site Facility Permit Final Second SEIR, October 2023.pdf — Santa Maria City Council, December 5, 2023

Santa Maria Regional Landfill Cell 1
Phase II Extension Project
Addendum to the Santa Maria Regional Landfill Site Facility Permit Final Second Supplemental Environmental Impact Report
SCH#1992031045
prepared by
City of Santa Maria
Utilities Department
2065 East Main Street
Santa Maria, California 93454
Contact: Herb Cantu, Deputy Director – Solid Waste
prepared with the assistance of
Rincon Consultants, Inc.
1530 Monterey Street, Suite D
San Luis Obispo, California 93401
October 2023
Attachment A
Table of Contents

Addendum to the Final Second Supplemental Environmental Impact Report i Table of Contents
1 Introduction .................................................................................................................................... 1 2 Previous Environmental Review ..................................................................................................... 3 3 Project Description ......................................................................................................................... 5

3.1 Lead Agency Name and Address ......................................................................................... 5

3.2 Contact Person and Phone Number ................................................................................... 5

3.3 Project Location .................................................................................................................. 5

3.4 Surrounding Land Uses and Setting .................................................................................... 5

3.5 General Plan Designation .................................................................................................... 8

3.6 Zoning Designation ............................................................................................................. 8

3.7 Project Site Characteristics ................................................................................................. 8

3.8 Project Background and Description ................................................................................ 10

3.9 Required Approvals ........................................................................................................... 13 4 Impact Analysis ............................................................................................................................. 19

4.1 Aesthetics .......................................................................................................................... 21

4.2 Agriculture and Forestry Resources .................................................................................. 25

4.3 Air Quality ......................................................................................................................... 29

4.4 Biological Resources .......................................................................................................... 33

4.5 Cultural Resources ............................................................................................................ 37

4.6 Energy ............................................................................................................................... 39

4.7 Geology and Soils .............................................................................................................. 41

4.8 Greenhouse Gas Emissions ............................................................................................... 45

4.9 Hazards and Hazardous Materials .................................................................................... 47

4.10 Hydrology and Water Quality ........................................................................................... 51

4.11 Land Use and Planning ...................................................................................................... 55

4.12 Mineral Resources ............................................................................................................ 57

4.13 Noise ................................................................................................................................. 59

4.14 Population and Housing .................................................................................................... 61

4.15 P ublic Services ................................................................................................................... 63

4.16 Recreation ......................................................................................................................... 65

4.17 Transportation .................................................................................................................. 67

4.18 Tribal Cultural Resources .................................................................................................. 69

4.19 Utilities and Service Systems ............................................................................................ 71

4.20 Wildfire.............................................................................................................................. 75

4.21 Mandatory Findings of Significance .................................................................................. 77 5 2004 Final Second SEIR Mitigation Measures Implemented to Address New or More Severe Impacts ......................................................................................................................................... 81 City of Santa Maria
Santa Maria Regional Landfill Cell 1 Phase II Extension Project ii
6 Conclusion..................................................................................................................................... 83 7 References .................................................................................................................................... 85 Figures
Figure 1 Regional Location ................................................................................................................ 6 Figure 2 Project Site Location ........................................................................................................... 7 Figure 3 Proposed Phase II Extension Site Plan .............................................................................. 15 Figure 4 Proposed Grading Plan...................................................................................................... 16 Figure 5 Reallocated Airspace ......................................................................................................... 17 Figure 6 Visual Rendering of Fill Plan .............................................................................................. 18 Appendices
Appendix A Air Quality and Greenhouse Gas Emissions Calculations Introduction
Addendum to the Final Second Supplemental Environmental Impact Report 1 1 Introduction
This document is an addendum to the 2004 Final Second Supplemental Environmental Impact Report (SEIR) for the Santa Maria Regional Landfill Site Facility Permit, prepared in compliance with the California Environmental Quality Act (CEQA) of 1970, Public Resources Code Section 21000, et seq., as amended, and implementing CEQA Guidelines, and Title 14, Chapter 3 of the California Code of Regulations. The 1993 Final Environmental Impact Report for the Santa Maria Regional Landfill Site Facility Permit, the 1995 Final Supplement to the Final Environmental Impact Report for the Santa Maria Regional Landfill Site Facility Permit, the 2001 Addendum to the Final Environmental Impact Report for the Santa Maria Regional Landfill Site Facility Permit Addressing the Santa Maria Joint Technical Document, the 2004 Second Supplemental Environmental Impact Report for the Santa Maria Regional Landfill Site Facility Permit, the 2018 Addendum to the Santa Maria Regional Landfill Site Facility Permit Final Supplemental Environmental Impact Report, and the 2021 Addendum to the Santa Maria Regional Landfill Site Facility Permit Final Second Supplemental Environmental Impact Report addressed amendments to the Solid Waste Facility Permit (SWFP), including the permitted capacity and daily acceptance rate of the facility, areas of disposal, maximum elevations and a height increase to Cell 1, use of inactive areas, and final cover. The specific project components addressed in each of these documents are summarized in Section 2, Previous Environmental Review.

The purpose of this Addendum is to analyze the environmental impacts of the proposed Santa Maria Regional Landfill Cell 1 Phase II Extension Project, herein referred to as the “proposed project.” The proposed project involves laterally extending the Cell 1 disposal area within the existing permitted waste footprint of the Santa Maria Regional Landfill (landfill) as Phase II of a previous extension. The proposed project would utilize existing unused airspace within the permitted height limit of the existing SWFP and extend the life of the Cell 1 Active Area of the landfill. Section 3, Project Description, describes the proposed project and explains the proposed changes in detail.

This Addendum has been prepared in accordance with the relevant provisions of CEQA and the CEQA Guidelines as implemented by the City of Santa Maria. According to Section 15164(b) of the CEQA Guidelines, an addendum to an EIR is the appropriate environmental document in instances when “only minor technical changes or additions are necessary or none of the conditions described in Section 15261 calling for the preparation of a subsequent EIR have occurred.” Section 15162(a) of the CEQA Guidelines states no subsequent EIR shall be prepared for a project unless the lead agency determines, on the basis of substantial evidence in the light of the whole record, one or more of the following:
 Substantial changes are proposed in the project which will require major revisions of the previous EIR or negative declaration due to the involvement of new significant environmental effects or a substantial increase in the severity of previously identified significant effects; or  Substantial changes occur with respect to the circumstances under which the project is undertaken which will require major revisions of the previous EIR or negative declaration due to the involvement of new significant environmental effects or a substantial increase in the severity of previously identified significant effects; o r
City of Santa Maria
Santa Maria Regional Landfill Cell 1 Phase II Extension Project

2  New information of substantial importance, which was not known and could not have been known with the exercise of reasonable diligence at the time the previous EIR was certified as complete or the negative declaration was adopted, shows any of the following:

A. The project will have one or more significant effects not discussed in the previous EIR or negative declaration,
B. Significant effects previously examined will be substantially more severe than shown in the previous EIR,
C. Mitigation measures or alternatives previously found not to be feasible would in fact be feasible and would substantially reduce one or more significant effects of the project, but the project proponents decline to adopt the mitigation measure or alternative, or D. Mitigation measures or alternatives which are considerably different from those analyzed in the previous EIR would substantially reduce one or more significant effects on the environment, but the project proponents decline to adopt the mitigation measure or alternative.

The changes that are being proposed with the Santa Maria Regional Landfill Cell 1 Phase II Extension Project would not create potentially significant environmental impacts in addition to those previously identified in the 2004 Final Second SEIR and Addendums thereto. The proposed project also would not substantially increase the magnitude or severity of impacts that were previously identified. This Addendum does not require public circulation because it does not provide significant new information that changes the 2004 Final Second SEIR or Addendums thereto in a way that deprives the public of a meaningful opportunity to comment upon a substantial adverse environmental effect of the proposed project or a feasible way to mitigate or avoid such an effect.

This Addendum includes a description of the proposed project, and a comparison of the impacts for all environmental issue areas listed in Appendix G of the CEQA Guidelines.

The City of Santa Maria shall consider this Addendum with the 2004 Final Second SEIR and associated Addendums prior to deciding on the proposed project. The 2004 Final Second SEIR and Addendums thereto are available for review at the City of Santa Maria Utilities Department, located at 2065 East Main Street, Santa Maria, California 93454.

Previous Environmental Review

Addendum to the Final Second Supplemental Environmental Impact Report 3 2 Previous Environmental Review
This section provides an overview of the 1993 Final EIR, the 1995 Final SEIR, the 2001 Addendum to the Final EIR, the 2004 Final Second SEIR, the 2018 Addendum to the Final Second SEIR, and the 2021 Addendum to the Final Second SEIR, to provide context for this Addendum. 1993 Santa Maria Regional Landfill Site Facility Permit Final EIR The 1993 Final EIR for the Santa Maria Regional Landfill Site Facility Permit addressed amendments to the SWFP in 1993 that allowed the landfill to accept up to 740 tons of solid waste per day, continue waste disposal operations in the area currently used for waste disposal up to a maximum elevation of 340 to 360 feet, and expand the landfill laterally into an area adjacent to the existing landfill and continue waste disposal operations in this area to an elevation of 360 feet. 1995 Final Supplemental EIR
The 1995 Final Supplement to the EIR addressed a proposal to develop a transfer station on the landfill property and transport the solid waste to up to 60 miles. 2001 Addendum to the Final EIR
An Addendum to the Final EIR for the Santa Maria Regional Landfill Site Facility Permit was prepared in 2001 and addressed a proposed Joint Technical Document (JTD) for the facility that included:
approval of existing monolithic cover as final cover for the 68-acre inactive area; potential use of the 68 acres of inactive area for recreational uses; expansion of landfill operations to an area currently used for borrow soils and onto an area at the southeast end of the landfill property; and use of non- hazardous, hydrocarbon-impacted soils as foundation material in active areas, and daily/intermediate cover material in the expansion area. 2004 Final Second Supplemental EIR
The 2004 Final Second SEIR for the facility addressed moving facilities to accommodate waste disposal in the lined landfill future area, increasing the height of the previous active landfill area (with hydrocarbon-impacted soils as closure foundation layer) to 362.5 feet, other operational changes, and implementation of a sports complex on the inactive portion of the landfill, in accordance with the Final Closure and Post-Closure Maintenance Plan for the landfill.

The 2004 Final Second SEIR described potential environmental impacts under a number of environmental issue areas that could occur in association with the proposed changes. The SEIR also identified methods by which potential impacts of these changes could be mitigated or avoided.

The 2004 Final Second SEIR identified mitigation measures, where necessary, to minimize or avoid potentially significant adverse impacts under the following issue areas: Geology, Water Resources, Safety, Air Quality, Land Use, Traffic, Biology, Noise, Aesthetics, and Public Services. The 2004 Final Second SEIR identified significant unavoidable impacts under the issue areas of Air Quality, Land Use, Noise, and Aesthetics.

City of Santa Maria
Santa Maria Regional Landfill Cell 1 Phase II Extension Project

4 2018 Addendum to the Final Second Supplemental EIR
An EIR Addendum to the 2004 Final Second SEIR was prepared in 2018 and addressed an increase in the height of the landfill by 47.5 feet to a total height of 410.0 feet with a reallocation of airspace from Cell 2 to Cell 1 without any proposed change to the overall capacity or lifespan of the landfill, or the permitted daily acceptance rate.
2021 Addendum to the Final Second Supplemental EIR
The 2021 Addendum to the 2004 Final Second SEIR addressed an extension to add approximately

9.5 acres of Class III disposal lined area to the existing 36-acre Cell 1 area. The extension acquired additional airspace by reallocating all remaining Cell 2 airspace to the Cell 1 area and reducing the elevation of the Cell 1 master fill grades from the maximum permitted elevation of 410 feet above mean sea level (AMSL) to 395 feet AMSL. The new total capacity of Cell 1 airspace remained under the maximum permitted design capacity. The 2021 Addendum also evaluated changing tonnage limits to be based on a seven-day maximum instead of a one-day maximum, without increasing the total annual throughput or permitted number of vehicles per day.

Current (2023) Environmental Review
This current (2023) Addendum to the 2004 Final Second SEIR considers whether the proposed project, involving a second phase of expanding the Cell 1 disposal area and other operational changes, is consistent with those impacts already characterized in the 2004 Final Second SEIR and associated Addendums, and if so, whether implementation of previously identified mitigation measures or other existing regulations would reduce or avoid potential impacts associated with the proposed project.

Project Description

Addendum to the Final Second Supplemental Environmental Impact Report 5 3 Project Description

3.1 Lead Agency Name and Address
City of Santa Maria
Utilities Department
2065 East Main Street
Santa Maria, California 93454

3.2 Contact Person and Phone Number
Herb Cantu, Deputy Director – Solid Waste
City of Santa Maria, Utilities Department
(805) 925-0951 ext. 7212

3.3 Project Location
The proposed project is within the permitted boundary of the Santa Maria Regional Landfill which is in the City of Santa Maria. The 291-acre landfill site is located at 2065 East Main Street, approximately two miles east of U.S. Highway 101 (U.S. 101), along the eastern edge of the City of Santa Maria. The project site is the landfill property and is comprised of Assessor’s Parcel Numbers (APN) 128-033-008; 128-094-008, -009, -041, -044, and -046

1. Figure 1 shows the project’s regional
location, and Figure 2 shows the proposed Cell 1 Phase II Extension area within the boundary of the landfill and in relation to the previous Cell 1 Extension.

3.4 Surrounding Land Uses and Setting
The project site is bordered by the Santa Maria River to the northeast and is surrounded by agricultural fields in all other directions. All the agricultural fields except for the parcels located directly south of the landfill are within unincorporated Santa Barbara County. Within the agricultural fields are farmhouses and agricultural buildings. The nearest farmhouse is located approximately 2,000 feet southwest of the landfill.

The nearest residential area is a single-family neighborhood within the Santa Maria City Limit and is located approximately 1.6 miles northwest of the project site on East Main Street. Pioneer High School is located east of the residential neighborhood approximately 2.0 miles from the project site, within the Santa Maria City Limit.

The areas surrounding the project site are primarily zoned Open Space (OS) and Agriculture (AG) with a Residential (R) area approximately 1.6 miles northwest.

1 APNs are updated from previous Addendums to reflect the current Santa Barbara County Assessor’s Maps for parcels within the Santa Maria Regional Landfill property boundary.

City of Santa Maria
Santa Maria Regional Landfill Cell 1 Phase II Extension Project

6 Figure 1 Regional Location

Project Description

Addendum to the Final Second Supplemental Environmental Impact Report 7 Figure 2 Project Site Location

City of Santa Maria
Santa Maria Regional Landfill Cell 1 Phase II Extension Project

8 3.5 General Plan Designation
The landfill site is designated in the City of Santa Maria General Plan as Recreational Open Space (ROS). Landfill operations are a permitted use under this designation.

3.6 Zoning Designation
The landfill site is zoned Open Space (OS). Landfill operations are a permitted use according to the City of Santa Maria Zoning Ordinance.

3.7 Project Site Characteristics
Project Site
The Santa Maria Regional Landfill has been in operation since the 1950s and is currently owned and operated by the City. The landfill is classified as a Class III disposal facility, permitted to accept non- hazardous solid wastes in accordance with the California Code of Regulations, Title 27 (27 CCR), Sections 20220 and 20230. The landfill site comprises approximately 291 acres, and the current permitted disposal area footprint is approximately 247 acres. The landfill can be divided into three general areas: the Active Area, the Inactive Area, and the Closed Active Area. Landfill disposal operations are currently being conducted in the Active Area. The Active Area is further divided into the lined Cell 1 and Cell 1 Extension areas, and accounts for approximately 45 acres on the southeast portion of the landfill site. The Cell 1 Active Area has been receiving Class III waste since late November 2002, and the Cell 1 Extension area that was constructed in 2021, began receiving waste in August 2022. Once disposal operations are completed in the Cell 1 and Cell 1 Extension area footprint, disposal operations will move to the City’s IWMF at Los Flores Ranch located approximately seven miles south of the Santa Maria Regional Landfill and one mile east of U.S. 101.

Adjacent to the Cell 1 Extension Active Area to the northwest is the Non-hazardous Hydrocarbon Impacted Soils (NHIS) Closed Active Area. This area has been closed for disposal of non-hazardous solid waste since November 30, 2002. Currently, this Closed Active Area is part of a rolling closure where NHIS material is accepted as an alternative thickened Final Cover Foundation Layer with a polyethylene separation liner between the underlying municipal solid waste and the overlaying NHIS. Upon reaching design elevations, this area will be closed with a final cover of a geosynthetic clay liner and cover soil. The Inactive Area of the landfill comprises the northwestern portion of the landfill site. This portion of the landfill contains predominantly burn ash and has not received any waste since the 1960s. It has been graded and several feet of additional final closure cover have been applied.

The landfill site is underlain by unconsolidated alluvial gravels, sands, and silts. It is inferred that the Santa Maria River Fault runs roughly parallel to the topographic divide along the northern side of the Santa Maria River in the vicinity of the site. Groundwater below the landfill site is generally encountered at a depth approximately 60 to 115 feet below the ground surface on the northeast side of the landfill and 60 to 130 feet below the ground surface on the southwest side of the landfill.

Groundwater flow in the project area is to the west and southwest.

Surface water flow from the Inactive Area, and the Closed Active Area that has had final closure, is channeled via concrete-lined drainage ditches along the base of the fill areas and the site perimeter to the Santa Maria River through outfalls in the Santa Maria River levee. Surface water from the Project Description

Addendum to the Final Second Supplemental Environmental Impact Report 9 Closed Active Area that has not completed final closure (that is continuing to receive final closure foundation material), is contained within the remaining unclosed area which has been constructed with a separation liner and a liquid collection system to capture water at designated low points, that then drain into holding tanks, where it is discharged to the City’s sanitary sewer system. Surface water flow from Active Areas is diverted via concrete-lined drainage ditches along the base of the refuse fill to the onsite stormwater retention basin. Off-site run-on is prevented from reaching the landfill surfaces on the northeast by the river levee and on the southwest by a berm created by concrete-lined perimeter ditches that divert run-on to the Santa Maria River through outfalls in the Santa Maria River levee.

Much of the landfill site has been used for waste disposal and to extract soil for daily cover in the active area of the landfill. Additional soils for daily, intermediate, and final cover have been mined at the adjacent Santa Maria riverbed. The predominant vegetation consists of ruderal (weedy) and ornamental plants.

A 70-foot-wide County Flood Control property that contains a Santa Maria River levee is located east of and immediately adjacent to the landfill site. Construction and demolition material was historically placed behind the levee to strengthen the levee system. In addition, the City performed placement of three to twelve feet of monolithic soil cover over the entire Inactive Area of the landfill site, including areas that contain construction and demolition materials.

Current Landfill Operations
The primary waste management operation that occurs at the Santa Maria Regional Landfill is the disposal of municipal solid waste and diversion of recyclable materials. Waste received at the landfill consists primarily of solid waste generated by residential, commercial/industrial, and agricultural sectors. Inert materials are currently accepted at the recycling operation of the landfill. The landfill occasionally receives non-putrescible hard-to-handle inert materials (e.g., mobile homes, non- recyclable large construction and demolition debris, non-recyclable bulk plastic and mattress loads, etc.). The landfill also receives NHIS soils as foundation material for final cover construction for the rolling closure program. Wastes that cannot be accepted at the landfill include hazardous, infectious, untreated medical, liquid, and other unacceptable items as determined by the landfill operator or state and federal regulations. The landfill has a Household Hazardous Waste Facility (HHWF) for acceptance of residential type hazardous waste (cleaners, paint, batteries, pesticides, etc.) and for Conditionally Exempt Small Quantity Generators. In addition, the landfill has a program to accept non-friable asbestos and treated medical waste.

In accordance with Solid Waste Facility Permit (SWFP) No. 42-AA-0016, maximum permitted tonnage for the facility is 11,683 tons per week (TPW). The maximum permitted throughput of 11,683 TPW includes a 7-day maximum of 6,006 TPW (based on an average of 858 tons per day [TPD]) for non-hazardous solid waste disposal and a 7-day maximum of 5,677 TPW (based on an average of 811 TPD) for recyclables, diversion, and beneficial reuse. In addition to the recycling daily limit, agricultural plastic received for recycling is limited to 15,000 tons per year. The tonnage limits established in the SWFP do not apply to clean earthen materials, NHIS, biosolids used as final landfill cover soil amendment, biosolids used as erosion control repair material, or materials received ready for use as Alternative Daily Cover (ADC). The maximum permitted traffic volume is 810 vehicles per day. If additional disposal tonnage is required due to mandatory time off, double days, or disaster relief, periodic increases in material disposal may be accepted if approved under a variance issued by the Santa Barbara County Environmental Health Division.

City of Santa Maria
Santa Maria Regional Landfill Cell 1 Phase II Extension Project

10 Access to the site is provided at the intersection of East Main Street and Philbric Road. Unauthorized entry to the site is limited by the locking gate system at the landfill and a perimeter fence. In general, the traffic flow to the landfill consists of private vehicles, City-owned refuse trucks, and commercial waste disposal trucks.

Complaints and concerns with landfill operations or maintenance are received at the scalehouse by the facility supervisor or at the adjacent City of Santa Maria Utilities Department administration building. To minimize public nuisance, operational policies include procedures to control for noise, litter, dust, odor, fire, vectors (i.e., flies and rodents), and birds. Environmental control programs include landfill gas control and monitoring; leachate collection, monitoring, and groundwater monitoring; and drainage and erosion control. The landfill is open to the public 358 days a year from 7:00 a.m. to 4:00 p.m. seven days a week, with permitted hours of operation extending from 5:00 a.m. to 7:00 p.m. for receipt of refuse and City landfill operations. Lighting is provided along the on- site access road, at the scalehouse, at the HHWF, and at the personnel rest area. A portable light trailer helps illuminate the active area for safe unloading operations during times of low lighting.

3.8 Project Background and Description
Context and Background
The City has permitted the Los Flores IWMF for future solid waste disposal needs of the City, but the infrastructure development has been delayed as the City reconciles the design to avoid construction of the waste management unit over the closed oil wells within the permitted disposal footprint, and to reduce the environmental impact of the project. The City has completed a revised Conceptual Design of the IWMF, which requires updating the current facility permits and CEQA documents. The City is in the process of developing design documents to revise the permits, support the CEQA findings, and develop the plans and specifications for construction of the infrastructure to open the IWMF. The process to update permits can take between approximately three and four years to complete. Based on some of the permit conditions, the infrastructure construction will also require up to three years to complete. In an effort to avoid re-permitting the Cell 2 area at the far southern end of the current landfill site beyond the office/maintenance shop and stormwater basin, the proposed project is the preferred option for continued operations at the landfill until the IWMF is complete. The Cell 2 area was previously removed from the permitted capacity for refuse disposal and would be required to be re-permitted if needed for future operations. Maximizing use of the Cell 1 area by expanding into already disturbed landfill areas and increasing weekly tonnage limits and design capacity would avoid the need for an expansion into the undeveloped Cell 2 area.

In recent years, there has been a substantial reduction of incoming NHIS foundation material due to the recent permits obtained at the Guadalupe, California oil field to construct a landfill facility to manage the existing NHIS on site, and the near completion of the Tank Farm Facility clean-up of NHIS materials located in San Luis Obispo, California. Additionally, to optimize waste processing from City-waste haulers and sources, the City desires to begin operations earlier than the currently permitted 5:00 am start time to facilitate collections during hours that would have the least impact to businesses and the public. The City would also adjust the recycled materials limit to accommodate increasing requirements to recycle and divert materials from the landfill and accommodate concrete and asphalt recycling projects that can have excessive weights.

Project Description

Addendum to the Final Second Supplemental Environmental Impact Report 11 Project Description
Due to the additional time required to permit the Los Flores IWMF and a substantial reduction of incoming NHIS foundation material, the City is proposing the following:

1. Phase II lateral extension of the Cell 1 Active Area by approximately 15.6 acres and vertical extension to allow refuse to reach the maximum permitted elevation of 410 feet AMSL.

2. Reallocate approximately 550,000 CY of existing and currently permitted NHIS airspace into MSW airspace.

3. Increase the refuse height of the original Cell 1 area, Cell 1 Phase I Extension, and the proposed Cell 1 Phase II Extension to the currently permitted height of 410 feet AMSL, resulting in approximately 1,280,000 CY of additional airspace beyond the currently permitted design capacity (13,998,400), resulting in a new permitted design capacity of 15,278,400 CY.

4. Increase the permitted maximum weekly tonnage for non-hazardous solid waste to accommodate an approximate 3 percent increase annually as delineated in the 2004 Final Second SEIR.

5. Increase the recycling permitted maximum weekly tonnage disposal limit to equal the disposal limit to maximize diversion of recyclable materials consistent with the fifty percent diversion mandate.

6. Adjust the permitted hours of operation starting time from 5:00 am to 4:00 am to accommodate disposal of materials collected from commercial business, which commence at 3:00 a.m. to minimize impacts to business and traffic within the community.

7. Adjust the site estimated closure timing to late 2034.

8. Install a Subtitle “D” liner system and Leachate Collection and Removal System (LCRS) at the Phase II Extension area.

9. Adjust the existing landfill gas (LFG) collection wells located in the Phase II Extension.

10. Install a 50-foot-wide access road on the southeastern side of the Phase II Extension area to maintain access to Cell 1 during operation and post closure maintenance.

11. Allow hard-to-handle materials including bulky wastes, construction and demolition debris, and inert debris received after 12:00 p.m. to be unloaded in an isolated area near the active face or next fill area and remain uncovered until no later than the end of the following day.

The previous environmental review for the landfill operations in the 2004 Final Second SEIR anticipated the landfill refuse acceptance would increase at a rate of approximately 3 percent annually, which equated to 6,006 TPW (based on an average of 858 TPD) for refuse disposal and 5,677 TPW (based on an average of 811 TPD) for recyclables in 2022. The landfill is currently permitted to accept 6,006 TPW (858 TPD) of refuse; however, the landfill would require an increased permitted maximum solid waste throughput in order to fulfill the needs of an approximate 3 percent growth in refuse to the proposed site estimated closure timing of late 2034.

The proposed project would increase the existing 7-day maximum for non-hazardous solid waste disposal by 3 percent annually. The landfill is also currently permitted to accept 5,677 (average 858 TPD) of recycling; however, the landfill would require an increased permitted maximum recycling throughput equivalent to the refuse disposal limit in order to comply with the state diversion mandate of 50 percent of total throughput (refuse plus recyclables) and meet the needs of an approximate 3 percent growth to the proposed site estimated closure timing of late 2034. This would result in the permitted maximum increasing from the current 6,006 TPW (average 858 TPD) to 8,820 TPW (based on an average of 1,260 TPD) for refuse and from the current 5,677 TPW City of Santa Maria
Santa Maria Regional Landfill Cell 1 Phase II Extension Project

12 (average 811 TPD) to 8,820 TPW (based on an average of 1,260 TPD) by the proposed site estimated closure timing of late 2034.

The height of waste and final cover under the proposed project would not exceed the existing SWFP maximum elevation of 410 feet AMSL. The current design height of the Cell 1 and Cell 1 extension is 395 feet ASML in order to remain within the SWFP maximum capacity limit. Increasing the elevation of the proposed project to the maximum elevation would provide approximately 1,755,000 CY of additional airspace to the landfill. This total airspace is subdivided into approximately 1,520,000 CY within the Phase II Extension area, and approximately 235,000 CY of airspace added above the existing Cell 1 and Cell 1 Extension design height. Approximately 155,000 CY of soil will be required for daily cover and final cover of these areas, leaving approximately 1,600,000 CY of effective airspace for waste disposal. As a result of this height increase and accounting for approximately 320,000 CY of remaining design capacity, the proposed project would be above the current permitted design capacity (13,998,400 CY) by approximately 1,280,000 CY. This would result in a new permitted design capacity of 15,278,400 CY.

The subgrade of the proposed project would be created by relocating and recompacting approximately 215,000 CY of NHIS material within the NHIS Closed Active Area, and the excess cut of approximately 130,000 CY of NHIS material would be stockpiled on top of the existing Cell 1 area deck. Approximately 58,000 CY of the NHIS material would be used in constructing perimeter berms for the Phase II Extension area.

The Phase II Extension would provide approximately 15.6 new acres of Class III disposal lined area which would connect to the existing 45-acre Cell 1/Cell 1 Extension area. At the current annual fill rate of approximately 220,000 CY per year, based on the landfill’s 2021 Annual Capacity Report, the proposed project would extend the use of the Cell 1 Active Area by approximately 7.25 years.

Currently, the 15.6 -acre Phase II Extension area is an unlined pre-Subtitle “D” refuse area but does have a Linear Low-Density Polyethylene separator liner under the NHIS foundation layer soil material with a NHIS Contact Water Collection and Removal System for the NHIS material. The Contact Water Collection System runs along the perimeter of the NHIS area and collects contact water from French drains and transfers them within solid pipes to the four storage tanks located on site. The proposed project would keep the Contact Water Collection System under the Phase II Extension area. The proposed project would also install a Subtitle “D” liner system for the purposes of groundwater protection. The liner would be similar to the composite liner system as the approved Cell 1 Extension area groundwater protection system. The liner would include a Geosynthetic Clay Liner and High-Density Polyethylene liners.

The proposed project would install a LCRS mainline collector pipe along the southwestern edge of the Phase II Extension floor, draining towards the existing Cell 1 sump collection tank farm. A new tank system would be installed to collect the drainage from the LCRS pipeline. The LCRS collector pipe would have lateral piping which runs parallel to the mainline collector pipe from the northeast to the southwest to assist in the collection of the leachate generated. The LCRS pipelines would be enclosed within a high-density polyethylene pipe system with leak detection and removal system to prevent leaks.

There are existing LFG collection wells located in the Phase II Extension area. The piping which connects to these wells would be cut and rerouted to redirect gas under and out from the Phase II Extension liner to proposed new well heads which are located outside of the perimeter of the Phase II Extension area. A horizontal geocomposite gas collection layer would be placed under the Phase II Extension composite base liner groundwater protection system and an LFG perforated collector pipe Project Description

Addendum to the Final Second Supplemental Environmental Impact Report 13 within a gravel trench would be installed along the perimeter edges of the Phase II Extension area base liner for the City to use for gas collection. Additional LFG collection wells would be placed within the Cell 1 Extension refuse waste fill, as needed, pursuant to current regulations and site characteristics.

The proposed project’s final design would increase the current NHIS top deck from 1 percent to 2 percent grade to enhance stormwater runoff into existing perimeter drainage channels via down drains, which would be directed to the existing stormwater retention basin onsite. The proposed project would include a new 50-foot-wide access road which would be constructed on the southeastern side of the Phase II Extension area to ensure access to Cell 1 is maintained during operation and post closure maintenance.

Figure 3 shows the site plan for the proposed project. Figure 4 shows the corresponding grading plan for the proposed project. Figure 5 shows a diagram displaying the reallocated airspace that would result from the proposed project. Figure 6 shows a visual rendering of the fill plan for the proposed project.

3.9 Required Approvals
The proposed project requires the following discretionary approvals:
 City staff approval of the proposed Cell 1 Phase II Extension, as analyzed in this document.  Central Coast Regional Water Quality Control Board approval of the Report of Facility Information (in the form of a Joint Technical Document).  The proposed project would require a revision to the landfill’s current SWFP issued by the Local Enforcement Agency (LEA) with concurrence from CalRecycle.

City of Santa Maria
Santa Maria Regional Landfill Cell 1 Phase II Extension Project

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Project Description

Addendum to the Final Second Supplemental Environmental Impact Report 15 Figure 3 Proposed Phase II Extension Site Plan

City of Santa Maria
Santa Maria Regional Landfill Cell 1 Phase II Extension Project

16 Figure 4 Proposed Grading Plan

Project Description

Addendum to the Final Second Supplemental Environmental Impact Report 17 Figure 5 Reallocated Airspace

City of Santa Maria
Santa Maria Regional Landfill Cell 1 Phase II Extension Project

18 Figure 6 Visual Rendering of Fill Plan

Impact Analysis

Addendum to the Final Second Supplemental Environmental Impact Report 19 4 Impact Analysis
This addendum evaluates potential environmental impacts that could result from the proposed project. Appendix G of the CEQA Guidelines provides a checklist of environmental issue areas that are suggested as the issue areas that should be assessed in CEQA analyses. The 2004 Final Second SEIR only addressed in detail ten of the 20 suggested environmental issue areas because the Initial Study prepared for the 2004 Final Second SEIR determined that other issue areas would not have potential to result in significant adverse environmental impacts. This addendum tiers off the 2004 Final Second SEIR and addresses each of the 20 environmental issue areas suggested by Appendix G of the CEQA Guidelines and updates the analysis based on current conditions, as listed below.

Potential environmental impacts of the proposed project are considered in comparison with the 2004 Final Second SEIR, to determine whether impacts associated with the proposed project are consistent with the impact analysis provided in the 2004 Final Second SEIR, and whether additional mitigation measures are required to minimize or avoid potential impacts. For the purposes of this impact analysis, the “approved project” refers to the actions approved by the 2004 Final Second SEIR.

CEQA Guidelines Appendix G Environmental Checklist
□ Aesthetics □ Agriculture and Forestry
Resources
□ Air Quality
□ Biological Resources □ Cultural Resources □ Energy
□ Geology and Soils □ Greenhouse Gas
Emissions
□ Hazards and Hazardous
Materials
□ Hydrology and Water
Quality
□ Land Use and Planning □ Mineral Resources
□ Noise □ Population and Housing □ Public Services
□ Recreation □ Transportation/Traffic □ Tribal Cultural Resources □ Utilities and Service
Systems
□ Wildfire □ Mandatory Findings of
Significance

City of Santa Maria
Santa Maria Regional Landfill Cell 1 Phase II Extension Project

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Impact Analysis
Aesthetics

Addendum to the Final Second Supplemental Environmental Impact Report 21

4.1 Aesthetics

A. Have a substantial adverse
effect on a scenic vista?
Section 4.9
Impact
AES-1
No No No N/A
B. Substantially damage scenic
resources, including but not
limited to, trees, rock
outcroppings, and historic
buildings within a state
scenic highway?
Section 4.9
Impact
AES-1
No No No N/A
C. In non-urbanized areas,
substantially degrade the
existing visual character or
quality of public views of the
site and its surroundings?
(Public views are those that
are experienced from a
publicly accessible vantage
point). If the project is in an
urbanized area, would the
project conflict with
applicable zoning and other
regulations governing scenic
quality?
Section 4.9
Impact
AES-1
No No No N/A
D. Create a new source of
substantial light or glare that
would adversely affect
daytime or nighttime views
in the area?
Section 4.9
Impact
AES-1
Yes No No Yes

MM AES-
1(c)
a. Would the project have a substantial adverse effect on a scenic vista? The analysis in Section 4.9 of the 2004 Final Second SEIR, Visual Resources, identified significant and unavoidable impacts related to scenic vistas. Although scenic vistas are not formally defined in the City of Santa Maria General Plan, views in the project vicinity are typical of rural and agricultural areas and reflect common scenic quality. Surrounding properties include the Santa Maria River and adjacent hillsides to the north, and row crops to the south, east, and west.

City of Santa Maria
Santa Maria Regional Landfill Cell 1 Phase II Extension Project

22 The proposed project would increase the Cell 1 Active Area by approximately 15.6 acres and allow refuse to reach the maximum permitted elevation of 410 feet ASML over the entirety of the Cell 1 Active Area. As shown in Figure 6, allowing refuse to reach the maximum permitted elevation of 410 feet ASML in the Cell 1 Active Area would not obstruct views of the hillsides or ridgeline which provide a backdrop to the landfill. Landfill slopes would continue to blend in with the natural topography of the hillsides. Therefore, the proposed project would not result in any new or substantially more severe impacts to scenic vistas beyond those identified in the 2004 Final Second SEIR and Addenda thereto.
b. Would the project substantially damage scenic resources, including but not limited to, trees, rock outcroppings, and historic buildings within a state scenic highway? The 2004 Final Second SEIR states that the portion of East Main Street west of Suey Road is the only scenic roadway within the City of Santa Maria. There are no views of the active landfill area from the scenic portion of East Main Street. The California Department of Transportation (Caltrans) identifies the portion of United States Route 101 (U.S. 101) approximately 2.6 miles west of the project site as an eligible state scenic highway; however, this portion of U.S. 101 is not officially designated as a state scenic highway (Caltrans 2018). The landfill is distantly visible from certain segments of U.S. 101; however, the backdrop of the hills and bluffs north of the Santa Maria River provide the primary scenic element in views from the highway, and the landfill is not a prominent visual component of views from U.S. 101. In addition, there are no trees, rock outcroppings, or historic buildings on the project site. Because the proposed project would not be substantially visible from a scenic highway and there are no designated scenic resources at project site or immediate vicinity, the proposed project would not result in any new or substantially more severe impacts to scenic resources within a state scenic highway beyond those identified in the 2004 Final Second SEIR and Addenda thereto.
c. Would the project, in non-urbanized areas, substantially degrade the existing visual character or quality of public views of the site and its surroundings? (Public views are those that are experienced from a publicly accessible vantage point). If the project is in an urbanized area, would the project conflict with applicable zoning and other regulations governing scenic quality?
The analysis in Section 4.9 of the 2004 Final Second SEIR, Visual Resources, identified significant and unavoidable impacts related to visual character and quality of site and its surroundings. The 2004 Final Second SEIR stated that an increase in elevation of 342.5 feet to 362.5 feet in the active portion of the landfill would not obscure any scenic elements in the project vicinity. However, the 2004 Final Second SEIR found that the height increase would result in a potentially significant impact to visual character due to the landfill’s visibility from residences and nearby roadways, including East Main Street, Philbric Road, and U.S. 101. The increased landfill height would be visible from surrounding public viewing locations, but the permitted height extension evaluated in the 2018 Addendum would not increase the height of the landfill slopes substantially in comparison to the current permitted elevation, and landfill slopes would continue to blend in with the natural topography of the background hillsides.

The proposed project would laterally extend the Cell 1 Active Area by approximately 15.6 acres and reallocate NHIS airspace and increase permitted design capacity by 1,280,000 CY to accommodate added airspace to fill up to the permitted elevation of 410 feet AMSL. Hard-to-handle materials including bulky wastes, construction and demolition debris, and inert debris received after 12:00 p.m. would be unloaded in an isolated area near the active face or next fill area and covered by the Impact Analysis
Aesthetics

Addendum to the Final Second Supplemental Environmental Impact Report 23 end of the following day. The proposed project would not increase the landfill’s height extension beyond its permitted elevation. Similar to what was analyzed in the 2018 Addendum, an increase in the refuse fill height to 410 feet ASML would not substantially increase the height of the landfill slopes in comparison to the current permitted elevation of 395 feet ASML. As a result, the proposed project would be consistent with the visual character of the remainder of the landfill site and the surrounding hillsides. As described in the 2004 Final Second SEIR, final slopes would be planted with native grasses, similar to other areas of the landfill. Therefore, the proposed project would not degrade the existing visual character of the surrounding hillsides or agricultural setting. The proposed project would not result in any new or substantially more severe impacts related to visual character beyond those identified in the 2004 Final Second SEIR and Addenda thereto. d. Would the project create a new source of substantial light or glare that would adversely affect daytime or nighttime views in the area?
The landfill contains existing parking lot lighting, security lighting, and lighting for buildings located at the landfill. Vehicles at the landfill create glare. The project site is approximately 1.5 miles east of developed areas of Santa Maria which contain substantial sources of light. The proposed project would adjust the permitted hours of operation from 5:00 am to 4:00 am which would require on- site lighting to be operated one hour earlier than under existing conditions. However, the proposed project would not introduce additional sources of light to the landfill beyond those that are currently in place. Operating lighting at 4:00 am rather than 5:00 am would introduce lighting in the area at an earlier time than under existing conditions; however, in accordance with Mitigation Measure AES-1(c) from the 2004 Final Second SEIR, lighting at the landfill is already directed downward and has reflectors to control light spillage onto adjacent surfaces. Therefore, the use of this lighting would not result in substantial lighting in the area beyond what is identified in the 2004 Final Second SEIR. The proposed project is anticipated to increase the maximum daily vehicles at the landfill from approximately 488 to approximately 719 by the end of 2034; however, this increase would not exceed the landfill’s existing maximum permitted traffic volume anticipated in the 2004 Final Second SEIR and approved by the City of Santa Maria and County of Santa Barbara Environmental Health Services (EHS) during subsequent SWFP amendments and reviews between 2004 and 2022 (EHS 2022). Therefore, the proposed project would not result in new or substantially more severe glare impacts due to on-site vehicle travel beyond what was previously evaluated. As a result, the proposed Cell 1 Extension would not result in any new or substantially more severe impacts to light or glare beyond those identified in the 2004 Final Second SEIR and Addenda thereto, with incorporation of Mitigation Measure AES-1(c).

City of Santa Maria
Santa Maria Regional Landfill Cell 1 Phase II Extension Project

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Impact Analysis
Agriculture and Forestry Resources

Addendum to the Final Second Supplemental Environmental Impact Report 25

4.2 Agriculture and Forestry Resources

A. Convert Prime Farmland,
Unique Farmland, or
Farmland of Statewide
Importance (Farmland), as
shown on maps prepared
pursuant to the Farmland
Mapping and Monitoring
Program of the California
Resources Agency, to non-
agricultural use?
Section 1.6,
Effects
Found Not
to Be
Significant
No No No N/A
B. Conflict with existing zoning
for agricultural use or a
Williamson Act contract?
Section 1.6,
Effects
Found Not
to Be
Significant
No No No N/A
C. Conflict with existing zoning
for, or cause rezoning of,
forest land (as defined in
Public Resources Code
Section 12220(g));
timberland (as defined by
Public Resources Code
Section 4526); or timberland
zoned Timberland Production
(as defined by Government
Code Section 51104(g))?
Section 1.6,
Effects
Found Not
to Be
Significant
No No No N/A
D. Result in the loss of forest
land or conversion of forest
land to non-forest use?
N/A; New
CEQA
checklist
item added
subsequent
to 2004
Final
Second
SEIR
No No No N/A
City of Santa Maria
Santa Maria Regional Landfill Cell 1 Phase II Extension Project

26 Where Impact
Was Analyzed
in the 2004
Final SEIR
Do Proposed
Changes
Involve New
or
Substantially
More Severe
Significant
Impacts?
Do Any New
Circumstances
Involve New or
Substantially
More Severe
Significant
Impacts?
Any
Substantially
Important
New
Information
Requiring New
Analysis or
Verification?
Do 2004 Final
SEIR
Mitigation
Measures
Address or
Resolve New
or More
Severe Project
Impacts?
E. Involve other changes in the
existing environment which,
due to their location or
nature, could result in
conversion of Farmland to
non-agricultural use or
conversion of forest land to
non-forest use?
N/A; New
CEQA
checklist
item added
after Final
Second
SEIR
No No No N/A
a. Would the project convert Prime Farmland, Unique Farmland, or Farmland of Statewide Importance (Farmland), as shown on maps prepared pursuant to the Farmland Mapping and Monitoring Program of the California Resources Agency, to non-agricultural use? b. Would the project conflict with existing zoning for agricultural use or a Williamson Act contract?
e. Would the project involve other changes in the existing environment which, due to their location or nature, could result in conversion of Farmland to non-agricultural use or conversion of forest land to non-forest use?
The 2004 Final Second EIR states the landfill site does not support crop production and was not designated for agricultural use or subject to a Williamson Act contract. The proposed project would occur entirely within the boundary of the permitted Santa Maria Regional Landfill facility area. The landfill property has a land use designation of Recreational Open Space (ROS) and is zoned Open Space (OS). According to the California Department of Conservation’s (DOC) California Important Farmland Finder, the project site is identified as Urban and Built-Up Land, and there is no Prime Farmland, Unique Farmland, or Farmland of Statewide Importance on the project site (DOC 2018).

In addition, the project site is not enrolled in a Williamson Act contract (County of Santa Barbara 2022).

No new agricultural uses have been introduced on the project site since the analysis of the 2004 Final Second SEIR. Therefore, because no agricultural land is located on-site and land use on and adjacent to the project site has not changed since the analysis of the 2004 Final Second SEIR, the proposed project would not result in any new or substantially more severe impacts to agricultural resources beyond those identified in the 2004 Final Second SEIR and Addenda thereto.

Impact Analysis
Agriculture and Forestry Resources

Addendum to the Final Second Supplemental Environmental Impact Report 27 c. Would the project conflict with existing zoning for, or cause rezoning of, forest land (as defined in Public Resources Code Section 12220(g)); timberland (as defined by Public Resources Code Section 4526); or timberland zoned Timberland Production (as defined by Government Code Section 51104(g))?
d. Would the project result in the loss of forest land or conversion of forest land to non-forest use? The 2004 Final Second SEIR did not directly address impacts to forest land or timberland, as these environmental topics were not included in Appendix G of the CEQA Guidelines in 2004 at the time the 2004 Final Second SEIR was prepared. There are no timberlands or forest lands located within or adjacent to the Specific Plan area. Therefore, the proposed project would not result in the loss or conversion of timberland or forest resources.

City of Santa Maria
Santa Maria Regional Landfill Cell 1 Phase II Extension Project

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Impact Analysis
Air Quality

Addendum to the Final Second Supplemental Environmental Impact Report 29

4.3 Air Quality

A. Conflict with or obstruct
implementation of the
applicable air quality plan?
Section 4.3
Impact AQ-
5 No No No N/A
B. Result in a cumulatively
considerable net increase of
any criteria pollutant for
which the project region is
non-attainment under an
applicable federal or state
ambient air quality standard?
Section 4.3
Impact AQ-
1 No No No N/A
C. Expose sensitive receptors to
substantial pollutant
concentrations?
Section 4.3
Impact AQ-
1 No No No N/A
D. Result in other emissions
(such as those leading to
odors) adversely affecting a
substantial number of
people?
Section 4.3
Impacts
AQ-3, AQ-4
Yes No No Yes
MM AQ-
3(a)
MM AQ-
3(b)
MM AQ-
3(c)
a. Would the project conflict with or obstruct implementation of the applicable air quality plan? The 2004 Final Second SEIR concluded that the landfill was consistent with the 2001 Clean Air Plan.

The 2001 Clean Air Plan has since been updated multiple times, and the most recent iteration of the Clean Air Plan, the 2022 Clean Air Plan, was published in December 2022 (Santa Barbara County Air Pollution Control District [SBCAPCD] 2022a). In order to determine consistency with the 2022 Clean Air Plan, SBCAPCD states a project’s direct and indirect emissions must be accounted for in the growth assumptions of the Clean Air Plan, which is based on land use and population projections provided by the Santa Barbara County Association of Governments (SBCAG). The proposed project would not result in population growth and therefore would be consistent with SBCAG projections.

Furthermore, in accordance with the 2022 Ozone Plan, standard dust control measures would be implemented during grading and earth moving activities, including SBCAPCD Rule 345 (Control of Fugitive Dust from Construction and Demolition Activities) which would reduce construction emissions. Therefore, the proposed project would not result in any new or substantially more severe impacts related to implementation of local air quality plans beyond those identified in the 2004 Final Second SEIR and Addenda thereto.

City of Santa Maria
Santa Maria Regional Landfill Cell 1 Phase II Extension Project

30 b. Would the project result in a cumulatively considerable net increase of any criteria pollutant for which the project region is non-attainment under an applicable federal or state ambient air quality standard?
c. Would the project expose sensitive receptors to substantial pollutant concentrations? The 2004 Final Second SEIR stated that, pursuant to the SBCAPCD requirements, construction mitigation measures are required for all projects involving earthmoving activities regardless of size or duration and proper implementation of these required would reduce fugitive dust emissions to a level that is less than significant. SBCAPCD has not adopted quantitative significance criteria for temporary construction emissions associated with conventional land development projects.

However, SBCAPCD recommends quantification of construction-related emissions, and uses 25 tons per year for reactive organic gases (ROG) or nitrogen oxides (NO X) as a guideline for determining the
significance of construction impacts for all types of projects (SBCAPCD 2022b).

The California Emissions Estimator Model (CalEEMod) Version 2022.1.1.12 was used to estimate regional air pollutant emissions associated with relocating and recompacting NHIS material within the NHIS Closed Active Area, NHIS material to be stockpiled, and NHIS material used to construct perimeter berms. Default assumptions in CalEEMod pertaining to estimated grading schedule, vendor/worker trips, and vehicle trip lengths were utilized to calculate construction emissions for the proposed project (Appendix A).

The proposed project’s grading activities would result in a combined 0.61 ton per year ROG and NO
X, well below SBCAPCD’s 25 tons per year threshold for ROG and NOx emissions (Appendix A). The proposed project would also continue to comply with the requirements of Mitigation Measure AQ-1 (a and b) from the 2004 Final Second SEIR, which includes vehicle maintenance and dust control measures to reduce air pollutant emissions during construction and operational activities.

Operational emission sources on the landfill site have not changed since the analysis contained in the 2004 Final Second SEIR. Rather than increasing operational areas and standards, the proposed project would reallocate existing unused airspace and extend the life of the Cell 1 Active Area of the landfill. The permitted maximum weekly tonnage for non-hazardous solid waste and recycling would increase, which is anticipated to increase the number of vehicles entering and exiting the landfill.

The average maximum vehicle throughput for the landfill was 488 vehicles per day between 2020 and 2022. Accounting for a corresponding three percent per year increase in vehicles associated with the increased refuse and recycling limits, the proposed project would result in approximately 719 vehicles per day by the end of 2034 which would not exceed the existing maximum permitted traffic volume of 810 vehicles per day anticipated in the 2004 Final Second SEIR and approved by the City of Santa Maria and County of Santa Barbara EHS during subsequent SWFP amendments and reviews between 2004 and 2022 (EHS 2022). Therefore, the proposed project would not result in new or more severe operational emissions related to traffic volumes beyond those identified in the 2004 Final Second SEIR. The proposed project would place a geocomposite gas collection layer under the Phase II Extension composite base liner groundwater protection system and an LFG perforated collector pipe within a gravel trench would be installed along the perimeter edges of the Phase II Extension base to ensure workers would not be exposed to substantial LFG concentrations.

As a result, project construction and operations would not violate air quality standards, contribute substantially to existing or projected violations, result in a net increase of a criteria pollutant for which the region is in non-attainment, or expose sensitive receptors to substantial pollutant concentration beyond what was analyzed in the 2004 Final Second SEIR. The project would not result in new or substantially more severe impacts to pollutant emissions, air quality standards, or sensitive receptors beyond those identified in the 2004 Final Second SEIR and Addenda thereto.

Impact Analysis
Air Quality

Addendum to the Final Second Supplemental Environmental Impact Report 31 d. Would the project result in other emissions (such as those leading to odors) adversely affecting a substantial number of people?
No new sources of odors have been located on or adjacent to the landfill site since the analysis in the 2004 Final Second SEIR. The proposed project would increase the permitted maximum throughput of refuse to 8,820 tons per week and the permitted maximum recycling throughput to 8,820 tons per week which is anticipated to result in increased odors from throughput at the landfill compared to existing conditions; however, the proposed project would continue to comply with the requirements of Mitigation Measure AQ-3 (a through c) from the 2004 Final Second SEIR, which includes provisions to reduce potential odor impacts related to on-going daily operations associated with waste management. Therefore, the project would not result in new or substantially more severe impacts related to odor nuisance beyond those identified in the 2004 Final Second SEIR and Addenda thereto.

City of Santa Maria
Santa Maria Regional Landfill Cell 1 Phase II Extension Project

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Impact Analysis
Biological Resources

Addendum to the Final Second Supplemental Environmental Impact Report 33

4.4 Biological Resources

A. Have a substantial adverse
effect, either directly or
through habitat
modifications, on any species
identified as a candidate,
sensitive, or special status
species in local or regional
plans, policies, or regulations,
or by the California
Department of Fish and
Wildlife or U.S. Fish and
Wildlife Service?
Section 4.7 No No No N/A
B. Have a substantial adverse
effect on any riparian
habitat or other sensitive
natural community
identified in local or regional
plans, policies, or
regulations, or by the
California Department of
Fish and Wildlife or U.S. Fish
and Wildlife Service?
Section 4.7 No No No N/A
C. Have a substantial adverse
effect on state or federally
protected wetlands
(including, but not limited to,
marsh, vernal pool, coastal,
etc.) through direct removal,
filling, hydrological
interruption, or other
means?
Section 4.7 No No No N/A
D. Interfere substantially with
the movement of any native
resident or migratory fish or
wildlife species or with
established native resident or
migratory wildlife corridors,
or impede the use of native
wildlife nursery sites?
Section 1.6,
Effects
Found Not
to Be
Significant
No No No N/A
City of Santa Maria
Santa Maria Regional Landfill Cell 1 Phase II Extension Project

34 Where Impact
Was Analyzed
in the 2004
Final SEIR
Do Proposed
Changes
Involve New
or
Substantially
More Severe
Significant
Impacts?
Do Any New
Circumstances
Involve New or
Substantially
More Severe
Significant
Impacts?
Any
Substantially
Important
New
Information
Requiring New
Analysis or
Verification?
Do 2004 Final
SEIR
Mitigation
Measures
Address or
Resolve New
or More
Severe Project
Impacts?
E. Conflict with any local
policies or ordinances
protecting biological
resources, such as a tree
preservation policy or
ordinance?
Section 1.6,
Effects
Found Not
to Be
Significant
No No No N/A
F. Conflict with the provisions
of an adopted Habitat
Conservation Plan, Natural
Community Conservation
Plan, or other approved local,
regional, or state habitat
conservation plan?
Section 1.6,
Effects
Found Not
to Be
Significant
No No No N/A
a. Would the project have a substantial adverse effect, either directly or through habitat modifications, on any species identified as a candidate, sensitive, or special status species in local or regional plans, policies, or regulations, or by the California Department of Fish and Wildlife or U.S. Fish and Wildlife Service?
b. Would the project have a substantial adverse effect on any riparian habitat or other sensitive natural community identified in local or regional plans, policies, or regulations, or by the California Department of Fish and Wildlife or U.S. Fish and Wildlife Service? c. Would the project have a substantial adverse effect on state or federally protected wetlands (including, but not limited to, marsh, vernal pool, coastal, etc.) through direct removal, filling, hydrological interruption, or other means?
The 2004 Final Second SEIR evaluated the environmental impacts related to the removal of existing ruderal habitat, impacts to raptors and loss of suitable nesting and foraging habitat, and impacts from the post-closure sports complex on native plant and animal species in the Santa Maria River corridor. All three impacts were determined to be less than significant without mitigation. As stated in the 2021 Addendum, much of the landfill site has been used for waste disposal or to extract soil for daily cover in the Active Area of the landfill. No native or otherwise undisturbed habitats are present on the project site.

The proposed project would occur within the existing disturbed footprint of the Santa Maria Regional Landfill in an area that is already highly disturbed and void of vegetation and other features that could support wildlife or other sensitive biological resources. The proposed project would not alter the existing disturbance footprint of the landfill or alter the Santa Maria River and its corresponding habitat located east of the project site. As a result, the proposed project would not result in new or substantially more severe impacts to candidate, sensitive, or special-status species; riparian habitat or other sensitive natural communities; or wetlands beyond those identified in the 2004 Final Second SEIR and Addenda thereto.

Impact Analysis
Biological Resources

Addendum to the Final Second Supplemental Environmental Impact Report 35 d. Would the project interfere substantially with the movement of any native resident or migratory fish or wildlife species or with established native resident or migratory wildlife corridors, or impede the use of native wildlife nursery sites? The 2004 Final Second SEIR concluded that there would be no impact to wildlife movement or wildlife nursery sites due to on-going disturbance at the landfill. These conditions have not changed, and the proposed project would not result in any change in day-to-day operations which would result in alterations to the adjacent Santa Maria River. Therefore, the proposed project would not interfere with the movement of fish or wildlife species and would not result in any new or substantially more severe impacts related to the movement of wildlife species beyond those identified in the 2004 Final Second SEIR and Addenda thereto. e. Would the project conflict with any local policies or ordinances protecting biological resources, such as a tree preservation policy or ordinance?
The 2004 Final Second SEIR concluded the proposed project would not conflict with any local policies or ordinances protecting biological resources. The proposed project would occur in an already disturbed area where no protected biological resources have been documented. Therefore, the proposed project would not conflict with any local policies or ordinances protecting biological resources.
f. Would the project conflict with the provisions of an adopted Habitat Conservation Plan, Natural Community Conservation Plan, or other approved local, regional, or state habitat conservation plan?
The 2004 Final Second SEIR concluded that there would be no conflicts with conservation plans, because the landfill was not subject to any adopted Habitat Conservation Plan, Natural Community Conservation Plan, or any other applicable approved plan with provisions for protecting biological resources. Since 2004, the project site has not been included in any adopted habitat conservation plans or natural community conservation plans (California Department of Fish and Wildlife 2019).

Therefore, the proposed project would not result in any new or substantially more severe impacts associated with such conflicts beyond those identified in the 2004 Final Second SEIR and Addenda thereto.

City of Santa Maria
Santa Maria Regional Landfill Cell 1 Phase II Extension Project

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Impact Analysis
Cultural Resources

Addendum to the Final Second Supplemental Environmental Impact Report 37

4.5 Cultural Resources

A. Cause a substantial adverse
change in the significance of
a historical resource
pursuant to §15064.5?
Section 1.6,
Effects
Found Not
to Be
Significant
No No No N/A
B. Cause a substantial adverse
change in the significance of
an archaeological pursuant to
§15064.5?
Section 1.6,
Effects
Found Not
to Be
Significant
No No No N/A
C. Disturb any human remains,
including those interred
outside of formal
cemeteries?
Section 1.6,
Effects
Found Not
to Be
Significant
No No No N/A
a. Would the project cause a substantial adverse change in the significance of a historical resource as defined in §15064.5?
b. Would the project cause a substantial adverse change in the significance of an archaeological resource pursuant to §15064.5?
c. Would the project disturb any human remains, including those interred outside of formal cemeteries?
The 2004 Final Second SEIR determined that there would be no impact to historical resources, archaeological resources, or human remains due to ongoing disturbance at the landfill. The proposed project would occur within the existing disturbed area of the landfill and would not alter the permitted disturbance footprint. Therefore, the proposed project would not result in any new or substantially more severe impacts to historical, archeological, or other cultural resources beyond those identified in the 2004 Final Second SEIR and Addenda thereto.

City of Santa Maria
Santa Maria Regional Landfill Cell 1 Phase II Extension Project

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Impact Analysis
Energy

Addendum to the Final Second Supplemental Environmental Impact Report 39

4.6 Energy

A. Result in a potentially
significant environmental
impact due to wasteful,
inefficient, or unnecessary
consumption of energy
resources, during project
construction or operation?
N/A; New
CEQA
checklist
item added
subsequent
to 2004
Final
Second
SEIR
No No No N/A
B. Conflict with or obstruct a
state or local plan for
renewable energy or energy
efficiency?
N/A; New
CEQA
checklist
item added
subsequent
to 2004
Final
Second
SEIR
No No No N/A
a. Would the project result in a potentially significant environmental impact due to wasteful, inefficient, or unnecessary consumption of energy resources, during project construction or operation?
b. Would the project conflict with or obstruct a state or local plan for renewable energy or energy efficiency?
The analysis in the 2004 Final Second SEIR predates updates to the CEQA Guidelines requiring the evaluation of potential impacts related to energy consumption and resources and, therefore, the analysis did not address such impacts. As with the approved waste disposal activities on the project site, the proposed project would involve the use of energy during construction and operation.

Energy use during the construction phase would be primarily in the form of fuel consumption to operate heavy equipment, light-duty vehicles, machinery, and generators for lighting. Temporary grid power may also be provided to construction trailers or electric construction equipment.

The construction contractor would be required to demonstrate compliance with applicable California Air Resource Board (CARB) regulations that restrict the idling of heavy-duty diesel motor vehicles and govern the accelerated retrofitting, repowering, or replacement of heavy-duty diesel on- and off-road equipment. Construction activities would be required to utilize fuel-efficient equipment consistent with State and federal regulations and would comply with State measures to reduce inefficient, wasteful, or unnecessary consumption of energy. Furthermore, in the interest of City of Santa Maria
Santa Maria Regional Landfill Cell 1 Phase II Extension Project

40 both environmental awareness and cost efficiency, construction contractors would not reasonably be expected to utilize fuel in a manner that is wasteful or unnecessary. Operation of the proposed project would occur in compliance with the energy conservation requirements in the California Energy Code (Title 24, Part 6, of the California Code of Regulations). Adherence to state energy requirements would ensure that the project is consistent with current energy standards and would not result in wasteful and inefficient use of non-renewable resources due to operation. Therefore, the proposed project would not result in wasteful, inefficient, or unnecessary consumption of energy resource or conflict with plans for renewable energy or energy efficiency.

Impact Analysis
Geology and Soils

Addendum to the Final Second Supplemental Environmental Impact Report 41

4.7 Geology and Soils

A. Directly or indirectly cause
potential substantial
adverse effects, including
the risk of loss, injury, or
death involving:

1. Rupture of a known
earthquake fault, as
delineated on the most
recent Alquist-Priolo
Earthquake Fault
Zoning Map issued by
the State Geologist for
the area or based on
other substantial
evidence of a known
fault?
Impact
G-1
No No No N/A

2. Strong seismic ground
shaking?
Impact
G-1
No No No N/A

3. Seismic-related ground
failure, including
liquefaction?
Impact
G-1
No No No N/A

4. Landslides? Impact
G-1
No No No N/A
B. Result in substantial soil
erosion or the loss of topsoil?
Impact
G-2
No No No N/A
C. Be located on a geologic unit
or soil that is unstable, or
that would become unstable
as a result of the project, and
potentially result in on- or
off-site landslide, lateral
spreading, subsidence,
liquefaction, or collapse?
Impacts
G-2, G-3
No No No N/A
City of Santa Maria
Santa Maria Regional Landfill Cell 1 Phase II Extension Project

42 Where Impact
Was Analyzed
in the 2004
Final SEIR
Do Proposed
Changes
Involve New
or
Substantially
More Severe
Significant
Impacts?
Do Any New
Circumstances
Involve New or
Substantially
More Severe
Significant
Impacts?
Any
Substantially
Important
New
Information
Requiring New
Analysis or
Verification?
Do 2004 Final
SEIR
Mitigation
Measures
Address or
Resolve New
or More
Severe Project
Impacts?
D. Be located on expansive soil,
as defined in Table 18-1-B of
the Uniform Building Code
(1994), creating substantial
direct or indirect risks to life
or property?
Impacts
G-2, G-3
No No No N/A
E. Have soils incapable of
adequately supporting the
use of septic tanks or
alternative wastewater
disposal systems where
sewers are not available for
the disposal of wastewater?
Impacts
G-2, G-3
No No No N/A
F. Directly or indirectly destroy
a unique paleontological
resource or site or unique
geologic feature?
Section 1.6,
Effects
Found Not
to Be
Significant
No No No N/A
a. Would the project directly or indirectly cause potential substantial adverse effects, including the risk of loss, injury, or death involving:
a.1 Rupture of a known earthquake fault, as delineated on the most recent Alquist-Priolo Earthquake Fault Zoning Map issued by the State Geologist for the area or based on other substantial evidence of a known fault?
a.2 Strong seismic ground shaking?
a.3 Seismic-related ground failure, including liquefaction? a.4 Landslides?
b. Would the project result in substantial soil erosion or the loss of topsoil? c. Would the project be located on a geologic unit or soil that is unstable, or that would become unstable as a result of the project, and potentially result in on- or off-site landslide, lateral spreading, subsidence, liquefaction, or collapse?
d. Would the project be located on expansive soil, as defined in Table 18-1-B of the Uniform Building Code (1994), creating substantial risks to life or property? e. Would the project have soils incapable of adequately supporting the use of septic tanks or alternative wastewater disposal systems where sewers are not available for the disposal of wastewater?
Impact Analysis
Geology and Soils

Addendum to the Final Second Supplemental Environmental Impact Report 43 The 2004 Final Second SEIR evaluated the environmental impacts related to seismic ground shaking, erosive soil hazards, and non-structural fill soils. Impacts were determined to be less than significant with implementation of Mitigation Measures G-2(a) and G-3(a) which require implementation of a grading and erosion control plan and preparation of a geotechnical study. Unlike the original project, the proposed project does not include new permanent habitable structures. Landfill operations would continue to comply with the California Building Code (CBC), the City’s Municipal Code, and General Plan Safety Element policies to minimize and/or avoid risks to life and property associated with geologic and soil hazards. Therefore, the proposed project would not result in new or substantially more severe impacts related to geological conditions beyond those identified in the 2004 Final Second SEIR and Addenda thereto.
f. Would the project directly or indirectly destroy a unique paleontological resource or site or unique geologic feature?
The 2004 Final Second SEIR determined that there would be no impact to paleontological resources due to ongoing disturbance at the landfill. The proposed project would be within the existing disturbed area of the landfill and would not alter the permitted disturbance footprint. Therefore, the proposed project would not result in any new or substantially more severe impacts to paleontological resources beyond those identified in the 2004 Final Second SEIR and Addenda thereto.

City of Santa Maria
Santa Maria Regional Landfill Cell 1 Phase II Extension Project

44 This page intentionally left blank.

Impact Analysis
Greenhouse Gas Emissions

Addendum to the Final Second Supplemental Environmental Impact Report 45

4.8 Greenhouse Gas Emissions

A. Generate greenhouse gas
emissions, either directly or
indirectly, that may have a
significant impact on the
environment?
N/A; New
CEQA
checklist
item added
subsequent
to 2004
Final
Second
SEIR
No No No N/A
B. Conflict with an applicable
plan, policy, or regulation
adopted for the purpose of
reducing the emissions of
greenhouse gases?
N/A; New
CEQA
checklist
item added
subsequent
to 2004
Final
Second
SEIR
No No No N/A
a. Would the project 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?
The 2004 Final Second SEIR did not address greenhouse gas emissions (GHG), because these checklist questions were not included in Appendix G of the CEQA Guidelines at the time the 2004 Final Second SEIR analysis was prepared. The City of Santa Maria has not adopted a quantitative significance threshold for GHG emissions or a specific methodology for analyzing impacts related to GHG emissions. The GHG emissions from project construction are provided for information purposes.

Construction activities for the proposed Cell 1 Extension would emit GHG emissions through the combustion of fossil fuels by heavy-duty construction equipment and through vehicle trips generated by construction workers. CalEEMod was used to estimate emissions associated with the construction period, based on parameters such as the duration of site preparation and grading activities, area of disturbance, and anticipated equipment used during construction. Based on the CalEEMod results, construction activity generated by the project would result in an estimated 91.9 metric tons of carbon dioxide equivalent (CO
2e) (Appendix A). When amortized over the targeted

7.25-year extension design capacity, construction activities would generate approximately 12.7 City of Santa Maria
Santa Maria Regional Landfill Cell 1 Phase II Extension Project

46 metric tons of CO2e per year (Appendix A). The proposed project would avoid the development of the Cell 2 area and, thus, avoid GHG emissions from the construction of Cell 2. The permitted maximum weekly tonnage for non-hazardous solid waste and recycling would increase, which is anticipated to increase the number of vehicles entering and exiting the landfill. The proposed project would increase the current average maximum vehicle throughput at the landfill from approximately 488 vehicles per day to approximately 719 vehicles per day by the end of 2034 which would not exceed the existing maximum permitted traffic volume of 810 vehicles per day anticipated in the 2004 Final Second SEIR and approved by the City of Santa Maria and County of Santa Barbara EHS during subsequent SWFP amendments and reviews between 2004 and 2022 (EHS 2022). Therefore, the proposed project would not result in new or more severe impacts related to GHG emissions from traffic volumes beyond those identified in the 2004 Final Second SEIR. The proposed project would extend the operational life of the landfill which would result in GHG emissions due to operation of the landfill. However, solid waste would continue to be generated in Santa Maria regardless of the landfill operation, and extending the landfill’s operation allows for the landfill to continue to serve the surrounding community rather than require solid waste generated in Santa Maria to be hauled to other, more distant landfills, necessitating longer vehicle trips and increased GHG emission from hauling trips. In addition, regulations governing greenhouse gas emissions have become more stringent since the certification of the 2004 Final Second SEIR. The proposed project would be required to comply with these regulations which would reduce GHG emissions throughout the lifetime of the landfill. As a result, the project would not generate substantial greenhouse gas emissions that may have a significant impact on the environment, and would not conflict with any applicable GHG reduction plan, policy or regulation.

Impact Analysis
Hazards and Hazardous Materials

Addendum to the Final Second Supplemental Environmental Impact Report 47

4.9 Hazards and Hazardous Materials

A. Create a significant hazard to
the public or the
environment through the
routine transport, use, or
disposal of hazardous
materials?
Section 4.5
Impact
S-6
No No No N/A
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?
Section 4.5
Impact
S-6
No No No Yes
C. Emit hazardous emissions or
handle hazardous or acutely
hazardous materials,
substances, or waste within

0.25 mile of an existing or
proposed school?
Section 4.5
Impact S-6
No No No N/A
D. Be located on a site that is
included on a list of
hazardous material 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?
Section 4.5 No No No N/A
E. For a project located in 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?
Section 1.6,
Effects
Found Not
to Be
Significant
No No No N/A
City of Santa Maria
Santa Maria Regional Landfill Cell 1 Phase II Extension Project

48 Where Impact
Was Analyzed
in the 2004
Final SEIR
Do Proposed
Changes
Involve New
or
Substantially
More Severe
Significant
Impacts?
Do Any New
Circumstances
Involve New or
Substantially
More Severe
Significant
Impacts?
Any
Substantially
Important
New
Information
Requiring New
Analysis or
Verification?
Do 2004 Final
SEIR
Mitigation
Measures
Address or
Resolve New
or More
Severe Project
Impacts?
F. Impair implementation of or
physically interfere with an
adopted emergency response
plan or emergency
evacuation plan?
Section 1.6,
Effects
Found Not
to Be
Significant
No No No N/A
G. Expose people or structures,
either directly or indirectly,
to a significant risk of loss,
injury, or death involving
wildland fires?
N/A No No No N/A
a. Would the project create a significant hazard to the public or the environment through the routine transport, use, or disposal of hazardous materials? b. Would the project create a significant hazard to the public or the environment through reasonably foreseeable upset and accident conditions involving the release of hazardous materials into the environment?
d. Would the project be located on a site that is included on a list of hazardous material 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?
As described in Section 3.7, Project Site Characteristics, the Santa Maria Regional Landfill is classified as a Class III disposal facility which is not permitted to accept liquid or solid hazardous waste. There is a Household Hazardous Waste Facility present at the landfill; however, as stated in the 2004 Final Second SEIR, household hazardous waste is kept on-site for a period no longer than 90 days. The proposed project would not expand the existing Household Hazardous Waste Facility at the Santa Maria Regional Landfill. The proposed project would increase the permitted maximum weekly tonnage for non-hazardous solid waste and recycling; however, this change would not result in an increase in the transport, use, or disposal of hazardous waste at the project site. A review of the State Water Resources Control Board’s (SWRCB) GeoTracker database was conducted in May 2023 to identify environmental records related to any potential hazardous materials sites on or in proximity to project site. The GeoTracker search did not identify any new hazardous materials sites on or within 1,000 feet of the project site (SWRCB 2023).

The proposed project would require regrading approximately 215,000 CY of NHIS material to develop a foundation and construct perimeter berms for the Phase II Extension area. As determined in the 2004 Final Second SEIR, landfill employees could be exposed to NHIS during the transport and/or disposal of these materials. Although these hydrocarbon-impacted soils would be in non- hazardous concentrations, improper handling of these materials could result in adverse health impacts to landfill employees. The proposed project would continue to comply with the requirements of Mitigation Measure S-2(d) from the 2004 Final Second SEIR, which includes provisions to minimize potential exposure of landfill employees to NHIS.

Impact Analysis
Hazards and Hazardous Materials

Addendum to the Final Second Supplemental Environmental Impact Report 49 The proposed project would also reroute existing LFG collection wells and install additional LFG collection wells within the Cell I Extension refuse waste fill as needed. These LFG collection wells shall not be located on existing structures at the landfill. The proposed projects would continue to comply with the requirements of Mitigation Measure S-1(c) from the 2004 Final Second SEIR which requires LFG extraction systems to remain active during all construction activities that involve ground disturbance.

Hard-to-handle materials including bulky wastes, construction and demolition debris, and inert debris received after 12:00 p.m. may not be able to be buried/covered by the end of the working day without posing a risk to landfill equipment and would require excessive amounts of cover material due to the nature and size of the material. To avoid turning away customers who arrive after 12:00 p.m. with non-putrescible hard-to-handle waste materials, the proposed project would allow for these materials to be unloaded in an isolated area near the active face or next fill area and may remain uncovered provided that it does not result in uncontrolled vectors, fires, odors, blowing litter, and does not present a threat to human health and the environment. These materials will be buried/covered as soon as practical but not later than by the end of the following day to avoid any health and safety risks.

Based on the discussion above, the proposed project would not result in any new or more severe impacts to the public or environment through the transport, use, disposal, or release of hazardous materials beyond those identified in the 2004 Final Second SEIR and Addenda thereto. c. Would the project emit hazardous emissions or handle hazardous or acutely hazardous materials, substances, or waste within 0.25 mile of an existing or proposed school? Inactive portions of the landfill are located approximately one quarter mile from Pioneer Valley High School located at 675 Panther Drive. However, active portions of the landfill, including the project site, are located one mile east of the high school. No routine transport, use, or disposal, of hazardous materials occurs at the landfill and conditions have not changed since the 2004 Final Second SEIR analysis. The proposed project would not expand the existing Household Hazardous Waste Facility or involve the usage of hazardous materials beyond what was evaluated in the 2004 Final Second SEIR. Therefore, the proposed project would not result in new or substantially more severe impacts to surrounding schools due to hazardous emissions and/or hazardous materials handling beyond those identified in the 2004 Final Second SEIR and Addenda thereto. e. For a project located in 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? The 2004 Final Second SEIR did not identify any impacts related to aviation related safety hazards.

The Santa Maria Airport, located approximately five miles southwest from the project site, is the closest airport to the project site. The project site is not located in any of the Santa Maria Airport’s identified noise or safety compatibility zones (SBCAG 2023). The proposed project would occur within the existing footprint of the Santa Maria Regional Landfill and would therefore not result in any new or substantially more severe impacts to safety associated with airport operations beyond those identified in the 2004 Final Second SEIR and Addenda thereto.

City of Santa Maria
Santa Maria Regional Landfill Cell 1 Phase II Extension Project

50 f. Would the project impair implementation of or physically interfere with an adopted emergency response plan or emergency evacuation plan?
No impacts related to adopted emergency response or evacuation plans were identified in the 2004 Final Second SEIR. Construction of the proposed project would occur within the existing footprint of the Santa Maria Regional Landfill. Once completed, the proposed project would not expand the maximum permitted traffic volume at the landfill. Therefore, the proposed project would not result in any new or substantially more severe impacts related to emergency response or evacuation plans beyond those identified in the 2004 Final Second SEIR and Addenda thereto. g. Would the project expose people or structures, either directly or indirectly, to a significant risk of loss, injury, or death involving wildland fires?
The landfill and project site does not include any forests or wildlands, and the surrounding land uses include agricultural production. No impacts associated with wildfire related safety risks were identified in the 2004 Final Second SEIR. The proposed project would occur entirely within the permitted, disturbed landfill footprint and would not result in substantial impacts associated with wildland fire hazards.

Impact Analysis
Hydrology and Water Quality

Addendum to the Final Second Supplemental Environmental Impact Report 51

4.10 Hydrology and Water Quality

A. Violate any water quality
standards or waste discharge
requirements or otherwise
substantially degrade surface
or ground water quality?
Section 4.2
Impact WR-
1 No No No N/A
B. Substantially decrease
groundwater supplies or
interfere substantially with
groundwater recharge such
that the project may impede
sustainable groundwater
management of the basin?
Section 4.2
Impact WR-
2 No No No N/A
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
Section 4.2
Impact WR-
3 No No No N/A
(ii) Substantially increase
the rate or amount of
surface runoff in a
manner which would
result in flooding on- or
off-site
Section 4.2
Impact WR-
3 No No No N/A
(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
Section 4.2
Impact WR-
3 No No No N/A
City of Santa Maria
Santa Maria Regional Landfill Cell 1 Phase II Extension Project

52 Where Impact
Was Analyzed
in the 2004
Final SEIR
Do Proposed
Changes
Involve New
or
Substantially
More Severe
Significant
Impacts?
Do Any New
Circumstances
Involve New or
Substantially
More Severe
Significant
Impacts?
Any
Substantially
Important
New
Information
Requiring New
Analysis or
Verification?
Do 2004 Final
SEIR
Mitigation
Measures
Address or
Resolve New
or More
Severe Project
Impacts?
(iv) Impede or redirect flood
flows?
Section 4.2
Impact WR-
3 No No No N/A
D. In flood hazard, tsunami, or
seiche zones, risk release of
pollutants due to project
inundation?
Section 1.6,
Effects
Found Not
to Be
Significant
No No No N/A
E. Conflict with or obstruct
implementation of a water
quality control plan or
sustainable groundwater
management plan?
Section 4.2
Impact WR-
1 No No No N/A
a. Would the project violate any water quality standards or waste discharge requirements or otherwise substantially degrade surface or ground water quality? c. Would the project substantially alter the existing drainage pattern of the site or area, including through the alteration of the course of a stream or river or through the addition of impervious surfaces, in a manner which would:
i. Result in substantial erosion or situation 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? iv. Impede or redirect flood flows?
e. Would the project conflict with or obstruct implementation of a water quality control plan or sustainable groundwater management plan?
The project site has a Contact Water Collection System which runs along the perimeter of the NHIS area and collects contact water from French drains and transfers them within solid pipes to the four storage tanks located on site. The proposed project would keep the Contact Water Collection System under the Phase II Extension area. The proposed project would also install a Subtitle “D” liner system for the purposes of groundwater protection. The proposed project would install a LCRS mainline collector pipe along the southwestern edge of the Phase II Extension floor, draining towards the existing Cell 1 sump collection tank farm. The LCRS collector pipe would have lateral piping which runs parallel to the mainline collector pipe from the northeast to the southwest to assist in the collection of the leachate generated. The LCRS pipelines would be enclosed within a high-density polyethylene pipe system with leak detection and removal system to prevent leaks. The proposed project’s final design would increase the current NHIS top deck from one percent to two Impact Analysis
Hydrology and Water Quality

Addendum to the Final Second Supplemental Environmental Impact Report 53 percent grade to ensure stormwater runoff would drain to existing perimeter drainage channels via down drains, which would be directed to the existing stormwater retention basin onsite. The proposed project would not change the footprint of the site, or otherwise affect the 70-foot-wide County Flood Control Property located adjacent to the landfill. Because the proposed project would disturb more than one acre, construction would be subject to the requirements of the National Pollutant Discharge Elimination System Construction General Permit which includes the preparation and implementation of a Storm Water Pollution Prevention Plan and associated best management practices to control erosion, sediment release, and otherwise reduce the potential for discharge of pollutants from construction into stormwater. Therefore, with the proposed liner system, drainage features within the project site, and regulatory compliance, the proposed project would not result in any new or substantially more severe impacts related to surface or groundwater water quality or drainage beyond those identified in the 2004 Final Second SEIR and Addenda thereto. b. Would the project substantially decrease groundwater supplies or interfere substantially with groundwater recharge such that the project may impede sustainable groundwater management of the basin?
As discussed in Section 4.19, Utilities and Service Systems, the proposed project would not result in any change to water supply or availability. The project site is not suitable for groundwater recharge as refuse could contribute to groundwater pollution. Therefore, the proposed project would not result in any new or substantially more severe impacts to groundwater supplies or groundwater recharge beyond those identified in the 2004 Final Second SEIR and Addenda thereto. d. In flood hazard, tsunami, or seiche zones, would the project risk release of pollutants due to project inundation?
The Federal Emergency Management Agency (FEMA) publishes Flood Insurance Rate Maps (FIRMs) which indicate flood hazard zones. The FIRM for the project site has been updated since the 2004 Final Second SEIR. The landfill is located within FIRMs #06083C0185F and #06083C0205F, both effective as of September 30, 2005 (FEMA 2023). The FIRMs depict the landfill as located in Zone X, which is categorized as an area of minimal flood hazards. The project site is located approximately 16 miles from the Pacific Ocean and therefore is not subject to tsunamis. The project site is not located in the vicinity of a lake such that the project site is at the risk of seiche. The proposed project would not involve the construction of buildings and therefore would not risk the release of pollutants in buildings due to inundation. Therefore, the proposed project would not result in any new or substantially more severe impacts related to the risk of pollutants due to inundation beyond those identified in the 2004 Final Second SEIR and Addenda thereto.

City of Santa Maria
Santa Maria Regional Landfill Cell 1 Phase II Extension Project

54 This page intentionally left blank.

Impact Analysis
Land Use and Planning

Addendum to the Final Second Supplemental Environmental Impact Report 55

4.11 Land Use and Planning

A. Physically divide an
established community?
Section 1.6,
Effects
Found Not
to Be
Significant
No No No N/A
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?
Section 4.4
Impacts
LU-1, LU-4
No No No N/A
a. Would the project physically divide an established community? b. Would the project cause a significant environmental impact due to a conflict with any land use plan, policy, or regulation adopted for the purpose of avoiding or mitigating an environmental effect?
The project site is currently used for landfill operations, and no established communities are located within the project site or footprint of the landfill. The project site is designated in the General Plan as Recreational Open Space (ROS) and is zoned as Open Space (OS). Landfill operations are a permitted use under these designations. The proposed project would increase the recycling permitted maximum weekly disposal limit; however, this would be done to ensure recycled materials are diverted consistent with the requirements of the California Integrated Waste Management Act. In addition, the proposed project would increase the permitted maximum weekly tonnage for non-hazardous solid waste to 8,820 tons per week and the maximum weekly tonnage for recyclables to 8,820 tons per week to accommodate an increase of three percent total solid waste generation per year through late 2034, as anticipated in the 2004 Final Second SEIR and consistent with previous permit updates to account for such growth. While this change would require an increased permitted maximum solid waste throughput, the increase would assist the landfill to meet Santa Maria’s solid waste collection needs, and landfill operations would continue to occur in compliance with applicable regulations related to solid waste disposal. Therefore, the proposed project would not result in any new or substantially more severe impacts associated with land use beyond those identified in the 2004 Final Second SEIR and Addenda thereto.

City of Santa Maria
Santa Maria Regional Landfill Cell 1 Phase II Extension Project

56 This page intentionally left blank.

Impact Analysis
Mineral Resources

Addendum to the Final Second Supplemental Environmental Impact Report 57

4.12 Mineral Resources

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?
Section 1.6,
Effects
Found Not
to Be
Significant
No No No N/A
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?
Section 1.6,
Effects
Found Not
to Be
Significant
No No No N/A
a. Would the project result in the loss of availability of a known mineral resource that would be of value to the region and the residents of the state?
b. Would the project result in the loss of availability of a locally important mineral resource recovery site delineated on a local general plan, specific plan, or other land use plan? No mining activities or extraction of mineral resources currently occur at the landfill, and the 2004 Final Second SEIR concluded the project site does not contain known mineral resources, and that operations of the landfill would not affect the availability of known mineral resources. According to the Resources Management Element of the City of Santa Maria General Plan, the Santa Maria River channel provides valuable mineral resources. The river contains the largest resources of Portland Cement Concrete-grade aggregate and approximately 90 percent of the available alluvial sand and gravel resources in the Santa Barbara and San Luis Obispo counties region (City of Santa Maria 2001). Although the project site is located adjacent to the Santa Maria River, the proposed project would not change or preclude the extraction of these resources, or otherwise affect existing mineral resources in the Santa Maria River. Since the proposed project would not result in the loss of available resources, the proposed project would not result in any new or substantially more severe impacts to mineral resources beyond those identified in the 2004 Final Second SEIR and Addenda thereto.

City of Santa Maria
Santa Maria Regional Landfill Cell 1 Phase II Extension Project

58 This page intentionally left blank.

Impact Analysis
Noise

Addendum to the Final Second Supplemental Environmental Impact Report 59

4.13 Noise

A. Generate 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?
Section 4.8
Impacts
N-1, N-2
N-3, N-4
No No No N/A
B. Generate excessive
groundborne vibration or
groundborne noise levels?
N/A No No No N/A
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, expose
people residing or working in
the project area to excessive
noise levels?
Section 1.6,
Effects
Found Not
to Be
Significant
No No No N/A
a. Would the project result in generation of a substantial temporary or permanent increase in ambient noise levels in the vicinity of the project in excess of standards established in the local general plan or noise ordinance, or applicable standards of other agencies? b. Would the project generate excessive groundborne vibration or groundborne noise levels? Grading activities for development of the proposed project would be similar in scale and nature to normal landfill operations occurring at the Santa Maria Regional Landfill. Grading activities would not require the use of jackhammers or other construction equipment which could generate substantial noise or groundborne vibration. The proposed project would extend the existing Cell 1 Active Area to allow additional disposal in the Cell 1 Active Area. The Cell 1 Active Area is currently used for material disposal and, thus, produces operational noise under existing conditions. The proposed project would increase the current annual permitted total throughput to accommodate an increase in total solid waste generation of three percent per year through late 2034, as anticipated in the 2004 Final Second SEIR and consistent with previous permit updates to account for such growth. The proposed project is anticipated to increase the average maximum vehicle throughput City of Santa Maria
Santa Maria Regional Landfill Cell 1 Phase II Extension Project

60 for the landfill from 488 vehicles per day to approximately 719 vehicles per day by the end of 2034 which would result in increased vehicle noise; however, the vehicle count would not exceed the existing maximum permitted traffic volume of 810 vehicles per day anticipated in the 2004 Final Second SEIR and approved by the City of Santa Maria and County of Santa Barbara EHS during subsequent SWFP amendments and reviews between 2004 and 2022 (EHS 2022). Therefore, the proposed project would not result in new or substantially more severe impacts related to noise from permitted traffic volumes beyond those identified in the 2004 Final Second SEIR. Accordingly, the expansion of the Cell 1 Active Area would not result in a substantial exceedance in operational noise sources beyond what was anticipated in the 2004 Final Second SEIR and Addenda thereto.

Because the project site is located within the existing footprint of the Santa Maria Regional Landfill, the proposed project would not result in operational noise sources closer to sensitive receptors than current landfill operations. Therefore, the proposed project would not result in any new or substantially more severe impacts related to noise or vibration generated during construction and operation beyond those identified in the 2004 Final Second SEIR and Addenda thereto. c. Would the project be 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, and expose people residing or working in the project area to excessive noise levels? The 2004 Final Second SEIR did not identify any impacts related to airport noise. The Santa Maria Airport, located approximately five miles southwest from the project site, is the closest airport to the project site. The project site is not located in any of the Santa Maria Airport’s identified noise compatibility zones (SBCAG 2023). In addition, there are no private airstrips in Santa Maria (Federal Aviation Administration 2023). The proposed project would occur within the existing footprint of the Santa Maria Regional Landfill and would therefore not result in any new or substantially more severe impacts related to airport noise beyond those identified in the 2004 Final Second SEIR and Addenda thereto.

Impact Analysis
Population and Housing

Addendum to the Final Second Supplemental Environmental Impact Report 61

4.14 Population and Housing

A. Induce substantial unplanned
population growth in an area,
either directly (e.g., by
proposing new homes and
businesses) or indirectly (e.g.,
through extension of roads
or other infrastructure)?
Section 5.2
Population
Growth
No No No N/A
B. Displace substantial numbers
of existing people or housing,
necessitating the
construction of replacement
housing elsewhere?
Section 1.6,
Effects
Found Not
to Be
Significant
No No No N/A
a. Would the project induce substantial unplanned population growth in an area, either directly (e.g., by proposing new homes and businesses) or indirectly (e.g., through extension of roads or other infrastructure)?
The 2004 Final Second SEIR determined no significant impacts related to population and housing would occur. The proposed project would not construct residential or commercial development and therefore would not directly induce substantial unplanned population growth. The proposed project would increase the permitted maximum throughput of refuse to 8,820 tons per week and the permitted maximum recycling throughput to 8,820 tons per week. The proposed project would not cause an increase in solid waste generation but would rather fulfill the permit requirements to accommodate an increase of three percent total solid waste generation per year through late 2034 which was anticipated in the 2004 Final Second SEIR and consistent with previous permit updates to account for such growth. Accordingly, the proposed project realizes the planned expansion of the landfill’s throughput increase. Therefore, the proposed project would not indirectly induce substantial unplanned population growth. Overall, the proposed project would not result in any new or substantially more severe impacts related to population growth beyond those identified in the 2004 Final Second SEIR and Addenda thereto.

City of Santa Maria
Santa Maria Regional Landfill Cell 1 Phase II Extension Project

62 b. Would the project displace substantial numbers of existing people or housing, necessitating the construction of replacement housing elsewhere?
The proposed project would occur within the existing permitted landfill site, where active waste management operations occur. There are no residences or other habitable structures located on the project site. Therefore, the proposed project would not displace people or housing. The proposed project would not result in any new or substantially more severe impacts related to population growth or housing/population displacement beyond those identified in the 2004 Final Second SEIR and Addenda thereto.

Impact Analysis
Public Services

Addendum to the Final Second Supplemental Environmental Impact Report 63

4.15 Public Services

A. Result in substantial adverse
physical impacts associated
with the provision of new or
physically altered
governmental facilities, or
the 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:

Section

4.10 1 Fire protection? Impact PS-1 No No No N/A
2 Police protection? Impact PS-2 No No No N/A
3 Schools? Section 1.6,
Effects
Found Not
to Be
Significant
No No No N/A
4 Parks? Section 1.6,
Effects
Found Not
to Be
Significant
No No No N/A
5 Other public facilities? Section 1.6,
Effects
Found Not
to Be
Significant
No No No N/A
City of Santa Maria
Santa Maria Regional Landfill Cell 1 Phase II Extension Project

64 a. Would the project result in substantial adverse physical impacts associated with the provision of new or physically altered governmental facilities, or the 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:

1. Fire protection?

2. Police protection?
No impacts to police or fire protection services were identified in the 2004 Final Second SEIR. The proposed project would extend the existing Cell 1 Active Area within the footprint of the Santa Maria Regional Landfill which would not require additional fire or police protection services beyond existing conditions. The proposed project would also adjust the permitted hours of operation starting time from 5:00 am to 4:00 am to accommodate disposal of materials collected from commercial businesses. These additional nighttime activities would increase the need for site security; however, as described in the 2004 Final Second SEIR, additional site security would be provided by the landfill operator. Accordingly, the proposed project would not necessitate the provision of new or physically altered fire or police stations. Therefore, the proposed project would not result in any new or substantially more severe impacts related to the provision of new or expanded police or fire services beyond those identified in the 2004 Final Second SEIR and Addenda thereto.
a. Would the project result in substantial adverse physical impacts associated with the provision of new or physically altered governmental facilities, or the 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:

3. Schools?

4. Parks?

5. Other public facilities?
No impacts to schools, parks, or other public facilities were identified in the 2004 Final Second SEIR.

As described in Section 4.14, Population and Housing, the proposed project would not construct residences or otherwise induce population growth; therefore, the proposed project would not generate additional park users, school-aged children, or new population that would utilize public facilities beyond existing conditions. Therefore, the proposed project would not result in any new or substantially more severe impacts related to school, parks, or public facilities beyond those identified in the 2004 Final Second SEIR and Addenda thereto.

Impact Analysis
Recreation

Addendum to the Final Second Supplemental Environmental Impact Report 65

4.16 Recreation

A. 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?
Section 1.6,
Effects
Found Not
to Be
Significant
No No No N/A
B. Include recreational facilities
or require the construction
or expansion of recreational
facilities which might have an
adverse physical effect on
the environment?
Section 1.6,
Effects
Found Not
to Be
Significant,
and
throughout
2004 Final
Second
SEIR
No No No N/A
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. Would the project include recreational facilities or require the construction or expansion of recreational facilities which might have an adverse physical effect on the environment? The 2004 Final Second SEIR did not identify substantial impacts related to recreation. The proposed project would extend the Cell 1 Active Area within the existing landfill and would not affect any recreational facilities. As described in Section 4.14, Population and Housing, the proposed project would not generate population growth; therefore, the proposed project would not require the construction or expansion of new recreational facilities. The proposed project would not result in any new or substantially more severe impacts related to recreational facilities beyond those identified in the 2004 Final Second SEIR and Addenda thereto.

City of Santa Maria
Santa Maria Regional Landfill Cell 1 Phase II Extension Project

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Impact Analysis
Transportation

Addendum to the Final Second Supplemental Environmental Impact Report 67

4.17 Transportation

A. Conflict with a program, plan,
ordinance or policy
addressing the circulation
system, including transit,
roadway, bicycle and
pedestrian facilities?
Section 4.6
Impacts
T-1, T-2,
T-5, T-6
No No No N/A
B. Conflict or be inconsistent
with CEQA Guidelines section
15064.3, subdivision (b)?
N/A; New
CEQA
checklist
item added
subsequent
to 2004
Final
Second
SEIR
No No No N/A
C. Substantially increase
hazards due to a geometric
design feature (e.g., sharp
curves or dangerous
intersections) or
incompatible use (e.g., farm
equipment)?
Section 4.6
Impacts
T-3, T-4
No No No N/A
D. Result in inadequate
emergency access?
Section 1.6,
Effects
Found Not
to Be
Significant
No No No N/A
a. Would the project conflict with a program, plan, ordinance or policy addressing the circulation system, including transit, roadway, bicycle and pedestrian facilities? The proposed project would occur within the existing footprint of the Santa Maria Regional Landfill and would not require the alteration of existing public transit, bicycle or pedestrian facilities. The proposed project would not result in population growth and therefore would not necessitate alterations to existing public transit, bicycle or pedestrian facilities. Therefore, the proposed project would not result in new or more severe impacts related to conflicts with a program, plan, ordinance, or policy addressing the circulation system beyond those identified in the 2004 Final Second SEIR and Addenda thereto.

City of Santa Maria
Santa Maria Regional Landfill Cell 1 Phase II Extension Project

68 b. Would the project conflict or be inconsistent with CEQA Guidelines section 15064.3, subdivision (b)?
Since adoption of the 2004 Final Second SEIR, the CEQA statutes and guidelines have been revised to require evaluation of impacts on the local transportation and circulation system on the basis of vehicle miles traveled (VMT). Pursuant to Senate Bill 743, the CEQA Guidelines have been updated to incorporate VMT as the primary metric for analyzing transportation impacts under CEQA. This update occurred after the preparation of the 2004 Final Second SEIR; therefore, the 2004 Final Second SEIR does not provide an analysis of VMT.

The proposed project would
increase the permitted maximum throughput of refuse and recycling at the landfill to accommodate an increase of three percent total solid waste generation per year through late 2034, as anticipated in the 2004 Final Second SEIR and consistent with previous permit updates to account for such growth. As a result, the average maximum vehicle throughput for the landfill, estimated at 488 vehicles per day, is anticipated to increase to approximately 719 vehicles per day by late 2034. This increase in vehicles per day would not exceed the existing maximum permitted traffic volume of 810 vehicles per day anticipated in the 2004 Final Second SEIR and approved by the City of Santa Maria and County of Santa Barbara EHS during subsequent SWFP amendments and reviews between 2004 and 2022 (EHS 2022). Therefore, the proposed project would not result in new or substantially more severe impacts related to permitted traffic volumes beyond what was previously evaluated. The proposed project would utilize existing soils at the landfill and would not require waste hauling trips beyond the minimal trips required for workers to arrive and depart at the project site during grading activities. Therefore, the proposed project would not generate VMT that would be inconsistent with CEQA Guidelines Section 15064.3(b). c. Would the project substantially increase hazards due to a geometric design feature (e.g., sharp curves or dangerous intersections) or incompatible use (e.g., farm equipment)? d. Would the project result in inadequate emergency access? The 2004 Final Second SEIR identified significant but mitigable impacts related to traffic hazards and less than significant impacts related to inadequate emergency access. The proposed project would include the installation of a 50-foot-wide access road on the southeastern side of the Phase II Extension area to maintain access to the Cell 1 Active Area during operation and post closure maintenance. The access road would be designed in accordance with applicable State regulations such as the California Fire Code which sets standards for the design and construction of access roads. The installation and operation of the access road would allow for maintained access throughout the landfill site for daily operations and emergency vehicles and would not result in substantial traffic hazards or inadequate emergency access. Therefore, the proposed project would not result in any new or substantially more severe impacts related to traffic hazards or emergency access beyond those identified in the 2004 Final Second SEIR and Addenda thereto.

Impact Analysis
Tribal Cultural Resources

Addendum to the Final Second Supplemental Environmental Impact Report 69

4.18 Tribal Cultural Resources

A. 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)?
N/A; New
CEQA
checklist
item added
subsequent
to 2004
Final
Second
SEIR
No No No N/A
B. 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.

N/A; New
CEQA
checklist
item added
subsequent
to 2004
Final
Second
SEIR
No No No N/A
Would the project cause a substantial adverse change in the significance of a tribal cultural resource, defined in a Public Resources Code Section 21074 as either a site, feature, place, or 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:

City of Santa Maria
Santa Maria Regional Landfill Cell 1 Phase II Extension Project

70 a. 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)? b. 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?
The 2004 Final Second SEIR did not directly address Tribal Cultural Resources, as this issue area was not included in Appendix G of the CEQA Guidelines at the time. Effective July 1, 2015, Assembly Bill (AB) 52 specifies that a project that may cause a substantial adverse change to a defined Tribal Cultural Resources (TCR) may result in a significant effect on the environment (California Public Resources Code [PRC] Section 21084.2). It further states that the lead agency shall establish measures to avoid impacts that would alter the significant characteristics of a Tribal Cultural Resource, when feasible (PRC Section 21084.3).

AB 52 requires tribes interested in development projects within a traditionally and culturally affiliated geographic area to notify a lead agency of such interest and to request notification of future projects subject to CEQA prior to determining if a negative declaration, mitigated negative declaration, or environmental impact report is required for a project. The lead agency is then required to notify the tribe within 14 days of deeming a development application subject to CEQA complete to notify the requesting tribe as an invitation to consult on the project. Because the 2004 Final Second SEIR, from which this Addendum tiers, was initiated prior to July 2015, Native American consultation pursuant to AB 52 is not required for the proposed project. As stated in Section 4.5, Cultural Resources, no historical or archaeological resources have been identified at the landfill, and the project site is within an existing disturbed area of the landfill and would not alter the permitted disturbance footprint. Therefore, the proposed project would not result in substantial impacts to Tribal Cultural Resources.

Impact Analysis
Utilities and Service Systems

Addendum to the Final Second Supplemental Environmental Impact Report 71

4.19 Utilities and Service Systems

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?
Impact LU-
3 No No No N/A
B. Have sufficient water
supplies available to serve
the project and reasonably
foreseeable future
development during normal,
dry and multiple dry years?
Impact WR-
4 No No No N/A
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?
Impact LU-
3 No No No N/A
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?
Impact LU-
4 No No No N/A
E. Comply with federal, state,
and local management and
reduction statutes and
regulations related to solid
waste?
Impact LU-
4 No No No N/A
City of Santa Maria
Santa Maria Regional Landfill Cell 1 Phase II Extension Project

72 a. Would the project require or result in the relocation or construction of new or expanded water, wastewater treatment or storm water drainage, electric power, natural gas, or telecommunications facilities, the construction or relocation of which could cause significant environmental effects?
c. Would the project result in a determination by the wastewater treatment provider which serves or may serve the project that it has adequate capacity to serve the project’s projected demand in addition to the provider’s existing commitments?
The 2004 Final Second SEIR did not identify impacts to wastewater system services due to the project’s consistency with the General Plan buildout and growth projections. The 2004 Final Second SEIR did not include an evaluation of impacts to telecommunications, electric power, and natural gas facilities. Impacts to stormwater facilities were determined to be less than significant with implementation of mitigation in the 2004 Final Second SEIR.

The proposed project would not result in population growth or otherwise increase wastewater generation at the project site. The proposed project would not require the construction of additional electric power, natural gas, or telecommunications facilities. The proposed project’s final design would increase the current NHIS top deck from one percent to two percent grade to ensure stormwater runoff would drain to existing perimeter drainage channels via down drains, which would be directed to the existing stormwater retention basin onsite. The proposed project would not change the footprint of the landfill site, or otherwise affect the 70-foot-wide County Flood Control Property located adjacent to the landfill. Accordingly, the proposed project would not require additional stormwater infrastructure. Therefore, the proposed project would not result in new or substantially more severe impacts to wastewater, stormwater drainage, electric power, natural gas, or telecommunications facilities or capacity beyond those identified in the 2004 Final Second SEIR and Addenda thereto.
b. Would the project have sufficient water supplies available to serve the project and reasonably foreseeable future development during normal, dry and multiple dry years? The 2004 Final Second SEIR determined the City would provide adequate water supply to the landfill. According to the City’s 2020 Urban Water Management Plan, water supplies from local groundwater and purchased water exceed total future estimated water demands under normal, single-dry, and multiple dry years (City of Santa Maria 2021). The proposed project would not increase existing water supply demands. Therefore, the proposed project would not result any new or substantially more severe impacts related to available water supply beyond those identified in the 2004 Final Second SEIR and Addenda thereto.
d. Would the project generate solid waste in excess of State or local standards, or in excess of the capacity of local infrastructure, or otherwise impair the attainment of solid waste reduction goals?
e. Would the project comply with federal, state, and local management and reduction statutes and regulations related to solid waste?
The 2004 Final Second SEIR determined no significant impacts would occur related to conflicts with local regulations related to solid waste because the volume of waste accepted at the landfill would not change. The proposed project would increase the recycling permitted maximum weekly disposal limit at the landfill. However, this increase is in order to ensure recycled materials are diverted consistent with the requirements of the California Integrated Waste Management Act, which Impact Analysis
Utilities and Service Systems

Addendum to the Final Second Supplemental Environmental Impact Report 73 requires a minimum 50 percent diversion rate. Therefore, the increase in recycled permitted maximum weekly disposal would occur in compliance with state regulations related to solid waste.

In addition, the proposed project would increase the maximum weekly tonnage for non-hazardous solid waste to accommodate an approximate three percent annual growth in refuse collected anticipated in the 2004 Final Second SEIR. This increase in permitted maximum weekly tonnage is intended to accommodate forecasted population growth and would not increase the rate of solid waste generation in Santa Maria. These increases in permitted capacities would be granted by the California Department of Resources, Recycling, and Recovery in compliance with existing state regulations related to solid waste. Furthermore, the intent of the proposed project is to provide increased capacity of the Santa Maria Regional Landfill to adequately serve Santa Maria until Los Flores IWMF is available for use. Once completed, the proposed project would assist in ensuring Santa Maria has adequate local solid waste infrastructure. Therefore, the proposed project would not result in any new or substantially more severe impacts related to solid waste disposal or compliance with applicable solid waste statutes and regulations beyond those identified in the 2004 Final Second SEIR and Addenda thereto.

City of Santa Maria
Santa Maria Regional Landfill Cell 1 Phase II Extension Project

74 This page intentionally left blank.

Impact Analysis
Wildfire

Addendum to the Final Second Supplemental Environmental Impact Report 75

4.20 Wildfire

A. Substantially impair an
adopted emergency
response plan or emergency
evacuation plan?
N/A; New
CEQA
checklist
item added
subsequent
to 2004
Final
Second
SEIR
No No No N/A
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?
N/A; New
CEQA
checklist
item added
subsequent
to 2004
Final
Second
SEIR
No No No N/A
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?
N/A; New
CEQA
checklist
item added
subsequent
to 2004
Final
Second
SEIR
No No No N/A
D. Expose people or structures
to significant risks, including
downslopes or downstream
flooding or landslides, as a
result of runoff, post-fire
slope instability, or drainage
changes?
N/A; New
CEQA
checklist
item added
subsequent
to 2004
Final
Second
SEIR
No No No N/A
City of Santa Maria
Santa Maria Regional Landfill Cell 1 Phase II Extension Project

76 If located in or near state responsibility areas or lands classified as very high fire hazard severity zones, would the project:
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? d. Expose people or structures to significant risks, including downslopes or downstream flooding or landslides, as a result of runoff, post-fire slope instability, or drainage changes? The 2004 Final Second SEIR predates the updates to the CEQA Guidelines requiring the evaluation of potential impacts related to wildfire; therefore, the 2004 Final Second SEIR did not address such impacts. The Santa Maria Regional Landfill is not located in a state responsibility area or adjacent to any lands classified as very high fire hazard severity zones (California Department of Forestry and Fire Protection 2022).

The proposed project would be entirely within the permitted footprint of the landfill, which is not located in a state responsibility area or adjacent to any lands classified as very high fire hazard severity zones. The proposed project would comply with state and local development standards to ensure emergency access to the site and comply with City emergency response and evacuation plans. The proposed project does not require the installation of fuel breaks, emergency water sources, or other utilities. The proposed 50-foot-wide access road would occur in the landfill footprint and therefore would not exacerbate fire risk. As described in Section 4.7, Geology and Soils, and Section 4.10, Hydrology and Water Quality, the proposed project would not exacerbate landslide or flooding risk or cause substantial drainage changes resulting in adverse impacts.

Therefore, the proposed project would not result substantial impacts related to wildfire.

Impact Analysis
Mandatory Findings of Significance

Addendum to the Final Second Supplemental Environmental Impact Report 77

4.21 Mandatory Findings of Significance

Where Impact
Was Analyzed
in the 2004
Final SEIR
Do Proposed
Changes
Involve New
or
Substantially
More Severe
Significant
Impacts?
Do Any New
Circumstances
Involve New
or
Substantially
More Severe
Significant
Impacts?
Any
Substantially
Important
New
Information
Requiring New
Analysis or
Verification?
Do 2004 Final
SEIR
Mitigation
Measures
Address or
Resolve New
or More
Severe Project
Impacts?
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?
Section 4.7
Biology
and
Section 1.6,
Effects
Found Not
to Be
Significant
No No No N/A
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)?
Throughout
the 2004
Final
Second
SEIR
No No No N/A
C. Does the project have
environmental effects which
will cause substantial
adverse effects on human
beings, either directly or
indirectly?
Throughout
the 2004
Final
Second
SEIR
Yes No No Yes
City of Santa Maria
Santa Maria Regional Landfill Cell 1 Phase II Extension Project

78 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? As discussed in Section 4.4, Biological Resources, the proposed project would occur within the existing disturbed footprint of the Santa Maria Regional Landfill in an area that is already highly disturbed and void of vegetation and other features that could support wildlife or other sensitive biological resources; therefore, the proposed project does not have the potential to 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, or substantially reduce the number or restrict the range of a rare or endangered plant or animal. As discussed in Section 4.5, Cultural Resources, and Section 4.18, Tribal Cultural Resources, the project site is within an existing disturbed area of the landfill and would not alter the permitted disturbance footprint of the landfill; therefore, the proposed project would not result in impacts that could eliminate important examples of the major periods of California history or prehistory. Therefore, the proposed project would not result in any new or substantially more severe impacts to wildlife habitats, populations, ranges, or important examples of the major periods of California history or prehistory beyond those identified in the 2004 Final Second SEIR and Addenda thereto. 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)? Cumulatively considerable impacts could occur if the construction of other projects occurs at the same time as the proposed project and in proximity to the project site such that the effects of multiple projects combine to result in greater adverse environmental effects than what would occur in accordance with individual projects. As described in Sections 4.1 through 4.20, construction would be temporary and localized to the project site and operations at the landfill would not substantially change beyond existing conditions such that an adverse environmental effect occurs due to the proposed project. The proposed project would have no new impact on biological resources, cultural resources, energy, land use, mineral resources, population and housing, public services, recreation, Tribal Cultural Resources, or wildfire. Therefore, the proposed project would not result in a cumulatively considerable contribution to any of these resource areas. In addition, certain resource areas (e.g., geology and soils, and hazards and hazardous materials) are by their nature site-specific, such that impacts at one location do not add to impacts at other locations, and therefore would not result in cumulative impacts.

Other resource areas (e.g., air quality and greenhouse gas emissions) inherently address cumulative impacts. As noted in Section 4.3, Air Quality, and 4.8, Greenhouse Gas Emissions, the proposed project would not release a cumulatively considerable net increase of any criteria pollutant and would not result in a substantial generation of greenhouse gas emissions; therefore, the proposed project would not have a cumulatively considerable contribution to impacts concerning air quality or greenhouse gas emissions.

Impact Analysis
Mandatory Findings of Significance

Addendum to the Final Second Supplemental Environmental Impact Report 79 According to the City’s list of current development activity, the nearest cumulative development projects are located approximately 2 miles west of the project site (City of Santa Maria 2023). Due to the project site’s distance to cumulative development in Santa Maria, the proposed project would not contribute to cumulative impacts concerning aesthetics or noise generation. The proposed project would not add substantial impervious surfaces and would comply with the NPDES Construction General Permit and install a liner for groundwater protection which would minimize the potential for the proposed project to contribute considerably to cumulative hydrology and water quality impacts. While the proposed project is anticipated to increase the average maximum vehicle throughput from 488 vehicles per day
to approximately 719 vehicles per day by late 2034,
this increase in vehicles per day would not exceed the existing maximum permitted traffic volume of 810 vehicles per day evaluated in previous reviews; therefore, the proposed project would not result in new or substantially more severe cumulative VMT impacts than those analyzed in the 2004 Final SEIR and Addenda thereto. The proposed project would not increase existing water supply demands or result in an increase in wastewater or solid waste generation; therefore, the proposed project would not have a cumulatively considerable contribution on impacts to utilities and service systems.
c. Does the project have environmental effects which will cause substantial adverse effects on human beings, either directly or indirectly?
In general, impacts to human beings are associated with air quality, GHG emissions, hazards and hazardous materials, noise, traffic safety, and wildfire. As discussed in the preceding sections, the proposed project’s impacts related to GHG emissions, noise, traffic safety, and wildfire would not exceed the impacts identified in the 2004 Final Second SEIR and Addenda thereto. Therefore, with implementation of the required measures, no substantial adverse effects on human beings would occur as a result of the proposed project. The proposed project would not result in new or substantially more severe environmental effects on human beings, either directly or indirectly, beyond what was analyzed in the 2004 Final Second SEIR and Addenda thereto.

City of Santa Maria
Santa Maria Regional Landfill Cell 1 Phase II Extension Project

80 This page intentionally left blank.

2004 Final Second SEIR Mitigation Measures Implemented to Address New or More Severe Impacts

Addendum to the Final Second Supplemental Environmental Impact Report 81 5 2004 Final Second SEIR Mitigation
Measures Implemented to Address New
or More Severe Impacts
Aesthetics
AES-1(c) Lighting Limitations. Prior to development of the recycling facilities and sports complex, proposed lighting shall be indicated on site plans that demonstrates that spill-over of lighting would not affect adjacent properties. The lighting plan shall incorporate lighting that direct light pools downward to prevent glare on adjacent and surrounding areas. Lights shall have solid sides and reflectors to further reduce lighting impacts by controlling light spillage. Light fixtures that shield adjacent properties from excessive brightness at night shall be included in the lighting plan.

Non-glare lighting shall be used.

Plan Requirements and Timing: The applicant shall submit a lighting plan subject to the review and approval of the Public Works Department prior to the issuance of building permits. Monitoring: Public Works Department shall site inspect prior to project operations
Air Quality
AQ-3(a) Greenwaste Recycling Odor Control. Plans for odor control of the recycling facilities such as injection of a chemical odor neutralizer into the intake air and/or chemical exhaust scrubbers containing sodium hypochlorite, potassium permanganate or similar substances shall be developed and implemented prior to the initiation of greenwaste recycling activities. A biofilter using microorganisms to treat odors or other acceptable measures also may be used.

Plan Requirements and Timing. Odor control measures shall be implemented by the landfill operator prior to initiation of the proposed greenwaste recycling activities. Monitoring. City inspectors shall perform periodic field checks during operations. APCD inspectors shall respond to nuisance complaints.

AQ-3(b) Biosolids Odor Control. The following biosolids odor control measures shall be implemented by the landfill operator:
 Clean daily all tanks, trucks and equipment that contact biosolids.  Minimize the length of time biosolids are stored prior to mixing with soils and spreading.
 Avoid land application when wind conditions favor transport of odors to residential areas.
 Develop an odor control plan and train all staff that may work with biosolids to identify and reduce odors.

City of Santa Maria
Santa Maria Regional Landfill Cell 1 Phase II Extension Project

82 Plan Requirements and Timing. Odor control measures shall be implemented by the landfill operator prior to initiation of the proposed biosolid use and disposal.

Monitoring. City inspectors shall perform periodic field checks during operations.

APCD inspectors shall respond to nuisance complaints.

AQ-3(c) Odor Monitoring. Landfill employees shall periodically conduct odor monitoring in areas adjacent to the proposed recycling facilities for the presence of nuisance odors. If odors are detected, the following measures shall be implemented. The following measures shall also be implemented in response to odor complaints by the public.
 Landfill employees shall attempt to determine the cause of the odors and rectify the situation.
 If odors are emanating from the active face, the landfill operator shall dispose of the materials or temporarily relocate the materials to an alternative site at the landfill until subsidence of the wind or meteorological conditions causing the odor episode.

Plan Requirements and Timing. These measures shall be implemented by the landfill operator during project operations if an odor problem occurs. Monitoring.

City inspectors shall perform periodic field checks during operations Conclusion

Addendum to the Final Second Supplemental Environmental Impact Report 83 6 Conclusion
In accordance with Section 15164 of the CEQA Guidelines, the City of Santa Maria has determined this Addendum to the 2004 Final Second SEIR is necessary to document changes proposed to the project since the 2004 Final Second SEIR was originally prepared. No new significant impacts or impacts of substantially greater severity beyond those previously disclosed in the 2004 Final Second SEIR would occur as a result of the proposed project. None of the conditions described in CEQA Guidelines Section 15162 calling for preparation of a subsequent EIR have occurred as a result of the proposed project. The City has reviewed and considered the information contained in this Addendum in its consideration of the 2004 Final Second SEIR and finds the preparation of a subsequent EIR is not necessary.

City of Santa Maria
Santa Maria Regional Landfill Cell 1 Phase II Extension Project

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References

Addendum to the Final Second Supplemental Environmental Impact Report 85 7 References
California Department of Conservation (DOC). 2018. California Important Farmland Finder. https://maps.conservation.ca.gov/DLRP/CIFF/ (accessed May 2023).

California Department of Fish and Wildlife. 2019. California Natural Community Conservation Plans.

April 2019. https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=68626&inline (accessed May 2023).

California Department of Forestry and Fire Protection. 2022. Fire Hazard Severity Zones in State Responsibility Area. November 21, 2022. https://calfire- forestry.maps.arcgis.com/apps/webappviewer/index.html?id=4466cf1d2b9947bea1d42699 97e86553 (accessed May 2023).

California Department of Transportation (Caltrans). 2018. California State Scenic Highway System Map.
https://caltrans.maps.arcgis.com/apps/webappviewer/index.html?id=465dfd3d807c46cc8e 8057116f1aacaa (accessed May 2023).

Federal Aviation Administration. 2023. Chart Supplements. https://www.faa.gov/air_traffic/flight_info/aeronav/digital_products/dafd/search/results/? cycle=2304&ident=&identDropDown=&volume=&state=CA&city=&cityDropDown=Santa+M aria&navaid=&navaidDropDown=&advanced=1 (accessed May 2023).

Federal Emergency Management Agency (FEMA). National Flood Hazard Layer (NFHL) Viewer. https://hazards-
fema.maps.arcgis.com/apps/webappviewer/index.html?id=8b0adb51996444d4879338b552 9aa9cd (accessed May 2023).

Santa Barbara, County of. 2022. 2022 Contract List. August 9, 2022. https://content.civicplus.com/api/assets/e9dc7ab1-d68b-402a-89fb-f0f91ffd50c6 (accessed May 2023).

County of Santa Barbara Environmental Health Services (EHS). 2022. Solid Waste Facility Permit 42- AA-0016. https://www2.calrecycle.ca.gov/SolidWaste/SiteDocument/Index/3284 (accessed June 2023).

Santa Barbara County Association of Governments (SBCAG). Santa Maria Airport Land Use Compatibility Plan. January 2023.
http://www.sbcag.org/uploads/2/4/5/4/24540302/smx_alucp_v2_final.pdf (accessed May 2023).

Santa Barbara County Air Pollution Control District (SBCAPCD). 2022a. 2022 Ozone Plan. https://www.ourair.org/wp-content/uploads/2022-Ozone-Plan.pdf (accessed May 2023). ______. 2022b. Scope and Content of Air Quality Sections in Environmental Documents. https://www.ourair.org/wp-content/uploads/ScopeContentJanuary2022- LimitedUpdates.pdf (accessed May 2023).

Santa Maria, City of. 2001. Resources Management Element. January 16, 2001. https://www.cityofsantamaria.org/home/showpublisheddocument/598/635488452761730 000 (accessed May 2023).

City of Santa Maria
Santa Maria Regional Landfill Cell 1 Phase II Extension Project

86 ______. 2021. 2020 Urban Water Management Plan. June 2021. https://www.cityofsantamaria.org/home/showpublisheddocument/28900/6376133615399 00000 (accessed May 2023).
______. 2023. January 2023 Major Developments List. https://www.cityofsantamaria.org/city- government/departments/community-development/planning-division/planning-policies- and-regulations/current-development-activity (accessed May 2023).

State Water Resources Control Board (SWRCB). 2023. GeoTracker. https://geotracker.waterboards.ca.gov/map/?CMD=runreport&myaddress=Santa+Maria (accessed May 2023).

Appendix A
Air Quality and Greenhouse Gas Emissions Calculations
SMRL Cell I Phase II Extension Custom Report, 9/25/2023 1 / 8
SMRL Cell I Phase II Extension Custom Report
Table of Contents

1. Basic Project Information

1.1. Basic Project Information

1.2. Land Use Types

1.3. User-Selected Emission Reduction Measures by Emissions Sector

2. Emissions Summary

2.1. Construction Emissions Compared Against Thresholds

2.2. Construction Emissions by Y ear, Unmitigated

3. Construction Emissions Details

3.1. Grading (2023) - Unmitigated

5. Activity Data

5.1. Construction Schedule

5.2. Off-Road Equipment

5.2.1. Unmitigated

5.3. Construction Vehicles
SMRL Cell I Phase II Extension Custom Report, 9/25/2023 2 / 8

5.3.1. Unmitigated

5.4. Vehicles

5.4.1. Construction Vehicle Control Strategies

5.7. Construction Paving

5.8. Construction Electricity Consumption and Emissions Factors SMRL Cell I Phase II Extension Custom Report, 9/25/2023 3 / 8

1. Basic Project Information

1.1. Basic Project Information
Data Field Value
Project Name SMRL Cell I Phase II Extension
Construction Start Date 7/1/2023
Lead Agency City of Santa Maria Utilities Department
Land Use Scale Project/site
Analysis Level for Defaults County
Windspeed (m/s) 2.90
Precipitation (days) 10.0
Location 34.948249968388026, -120.37476282800009
County Santa Barbara
City Santa Maria
Air District Santa Barbara County APCD
Air Basin South Central Coast
TAZ 3385
EDFZ 6
Electric Utility Pacific Gas & Electric Company
Gas Utility Southern California Gas
App Version 2022.1.1.19

1.2. Land Use Types
Land Use Subtype Size Unit Lot Acreage Building Area (sq ft) Landscape Area (sq ft)
Special Landscape
Area (sq ft)
Population Description
Other Non-Asphalt
Surfaces

15.6 Acre 15.6 0.00 0.00 — — Landfill Expansion
Area
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1.3. User-Selected Emission Reduction Measures by Emissions Sector No measures selected

2. Emissions Summary

2.1. Construction Emissions Compared Against Thresholds Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Un/Mit. TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Unmit. 4.54 3.82 37.4 32.3 0.06 1.59 3.71 5.31 1.47 1.45 2.92 — 6,729 6,729 0.28 0.06 0.64 6,754 Average
Daily
(Max)
— — — — — — — — — — — — — — — — — —
Unmit. 0.37 0.31 3.07 2.65 0.01 0.13 0.31 0.44 0.12 0.12 0.24 — 553 553 0.02 < 0.005 0.02 555 Annual
(Max)
— — — — — — — — — — — — — — — — — —
Unmit. 0.07 0.06 0.56 0.48 < 0.005 0.02 0.06 0.08 0.02 0.02 0.04 — 91.5 91.5 < 0.005 < 0.005 < 0.005 91.9

2.2. Construction Emissions by Y ear, Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Y ear TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Daily -
Summer
(Max)
— — — — — — — — — — — — — — — — — —
2023 4.54 3.82 37.4 32.3 0.06 1.59 3.71 5.31 1.47 1.45 2.92 — 6,729 6,729 0.28 0.06 0.64 6,754 Daily -
Winter
(Max)
— — — — — — — — — — — — — — — — — —
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Average
Daily
— — — — — — — — — — — — — — — — — —
2023 0.37 0.31 3.07 2.65 0.01 0.13 0.31 0.44 0.12 0.12 0.24 — 553 553 0.02 < 0.005 0.02 555 Annual — — — — — — — — — — — — — — — — — —
2023 0.07 0.06 0.56 0.48 < 0.005 0.02 0.06 0.08 0.02 0.02 0.04 — 91.5 91.5 < 0.005 < 0.005 < 0.005 91.9

3. Construction Emissions Details

3.1. Grading (2023) - Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Location TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Onsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Off-Road
Equipment

4.43 3.72 37.3 31.4 0.06 1.59 — 1.59 1.47 — 1.47 — 6,598 6,598 0.27 0.05 — 6,621 Dust
From
Material
Movement
— — — — — — 3.59 3.59 — 1.42 1.42 — — — — — — —
Onsite
truck

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 0.00 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Average
Daily
— — — — — — — — — — — — — — — — — —
Off-Road
Equipment

0.36 0.31 3.07 2.58 0.01 0.13 — 0.13 0.12 — 0.12 — 542 542 0.02 < 0.005 — 544 SMRL Cell I Phase II Extension Custom Report, 9/25/2023 6 / 8
———————0.120.12—0.300.30——————Dust
From
Material
Movement
Onsite
truck

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 0.00 Annual — — — — — — — — — — — — — — — — — —
Off-Road
Equipment

0.07 0.06 0.56 0.47 < 0.005 0.02 — 0.02 0.02 — 0.02 — 89.8 89.8 < 0.005 < 0.005 — 90.1 Dust
From
Material
Movement
— — — — — — 0.05 0.05 — 0.02 0.02 — — — — — — —
Onsite
truck

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 0.00 Offsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Worker 0.11 0.10 0.07 0.86 0.00 0.00 0.12 0.12 0.00 0.03 0.03 — 131 131 0.01 0.01 0.64 133 Vendor 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 0.00 Hauling 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 0.00 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Average
Daily
— — — — — — — — — — — — — — — — — —
Worker 0.01 0.01 0.01 0.07 0.00 0.00 0.01 0.01 0.00 < 0.005 < 0.005 — 10.5 10.5 < 0.005 < 0.005 0.02 10.7 Vendor 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 0.00 Hauling 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 0.00 Annual — — — — — — — — — — — — — — — — — —
Worker < 0.005 < 0.005 < 0.005 0.01 0.00 0.00 < 0.005 < 0.005 0.00 < 0.005 < 0.005 — 1.74 1.74 < 0.005 < 0.005 < 0.005 1.77 Vendor 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 0.00 SMRL Cell I Phase II Extension Custom Report, 9/25/2023 7 / 8
Hauling 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 0.00

5. Activity Data

5.1. Construction Schedule
Phase Name Phase Type Start Date End Date Days Per Week Work Days per Phase Phase Description Grading Grading 7/1/2023 8/11/2023 5.00 30.0 —

5.2. Off-Road Equipment

5.2.1. Unmitigated
Phase Name Equipment Type Fuel Type Engine Tier Number per Day Hours Per Day Horsepower Load Factor Grading Graders Diesel Average 1.00 8.00 148 0.41
Grading Excavators Diesel Average 2.00 8.00 36.0 0.38
Grading Tractors/Loaders/Backh
oes
Diesel Average 2.00 8.00 84.0 0.37
Grading Scrapers Diesel Average 2.00 8.00 423 0.48
Grading Rubber Tired Dozers Diesel Average 1.00 8.00 367 0.40

5.3. Construction Vehicles

5.3.1. Unmitigated
Phase Name Trip Type One-Way Trips per Day Miles per Trip Vehicle Mix Grading — — — —
Grading Worker 20.0 8.80 LDA,LDT1,LDT2
Grading Vendor 0.00 5.30 HHDT,MHDT
Grading Hauling 0.00 20.0 HHDT
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Grading Onsite truck 0.00 20.0 HHDT

5.4. Vehicles

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

5.7. Construction Paving
Land Use Area Paved (acres) % Asphalt
Other Non-Asphalt Surfaces 15.6 0%

5.8. Construction Electricity Consumption and Emissions Factors kWh per Y ear and Emission Factor (lb/MWh)
Y ear kWh per Y ear CO2 CH4 N2O
2023 0.00 204 0.03 < 0.005

Santa Maria City CouncilDecember 5, 2023

Santa Maria City Council
December 5, 2023