CASQA Traditional SWPPP Template August 2023 for the 2022 CGP

STORMWATER POLLUTION PREVENTION PLAN

for

Fire Station No. 227

Project Location:

WDID: [Number]

RISK LEVEL: 1

Legally Responsible Person (LRP):

County of San Bernardino Project & Facilities Management

385 N Arrowhead Avenue, 3rd Floor, San Bernardino, CA 92415

Donald Day

9h09-387-5224

Duly Authorized Representative (DAR):

County of San Bernardino

909-387-5000

Project Address:

180 W. 38th St

San Bernardino, CA 92405

Site Operating Hours:

8:00 AM – 5:00 PM

Estimated Project Dates:

Start of Construction: December 2025

Completion of Construction: November 2026

SWPPP Prepared by:

Engineering Resources of Southern California, Inc

1861 West Redlands Blvd.

Redlands, CA 92373

SWPPP Preparation Date:

December 2024

QSD Name and Signature:

Leidy Stephania Hernandez, P.E., QSD

CASQA Traditional SWPPP Template ii August 2023

Contact Information

Role Name Phone Number License or Certification Number, if Applicable

Qualified SWPPP Developer (QSD)

Leidy Stephania

Hernandez

909-890-1255

C97548

Qualified SWPPP Practitioner (QSP)

Jonathan Sachrison 949-753-7070 #83774

Qualified SWPPP Practitioner (QSP)

QSP Delegate

Index of Appendices

Appendix Title Page

A Site Maps and Drawings A-1

B Permit Registration Documents B-1

C SWPPP Amendment QSD Certifications C-1

D Submitted Changes of Information D-1

E Construction Schedule E-1

F Construction Activities, Materials Used, and Associated Pollutants

F-1

G CASQA Stormwater BMP Handbook:

Construction Fact Sheets

G-1

H BMP Inspection Form H-1

I Training Forms I-1

J Responsible Parties J-1

K Contractors and Subcontractors K-1

L Calculations L-1

M Weather Reports M-1

N Monitoring Records N-1

O Example Storm Event Monitoring Forms O-1

P Field Meter Instructions P-1

CASQA Traditional SWPPP Template iii August 2023

Q Supplemental Information Q-1

R Active Treatment System and Passive Treatment Plans

R-1

S Appendix S: Construction General Permit

S-1

CASQA Traditional SWPPP Template iv August 2023

Table of Contents

Table of Contents ...................................................................................................iv

Qualified SWPPP Developer ................................................................................ vii

Amendment Log ................................................................................................. viii

Section 1 SWPPP Requirements .................................................................. 1-1

1.1 Introduction ................................................................................................................... 1-1

1.2 Permit Registration Documents .................................................................................... 1-1

1.3 SWPPP Availability and Implementation ..................................................................... 1-2

1.4 SWPPP Amendments.................................................................................................... 1-2

1.5 Retention of Records .................................................................................................... 1-4

1.6 Reporting ...................................................................................................................... 1-4

1.7 Changes to Permit Coverage ......................................................................................... 1-5

1.8 Notice of Termination ................................................................................................... 1-5

Section 2 Project Information ...................................................................... 2-1

2.1 Project and Site Description ......................................................................................... 2-1

2.1.1 Site Description ........................................................................................................ 2-1

2.1.2 Existing Conditions .................................................................................................. 2-1

2.1.3 Existing Drainage..................................................................................................... 2-1

2.1.4 Geology and Groundwater ....................................................................................... 2-2

2.1.5 Project Description .................................................................................................. 2-2

2.1.6 Developed Condition ............................................................................................... 2-2

2.2 Permits and Governing Documents .............................................................................. 2-2

2.3 Stormwater Run-On from Offsite Areas ....................................................................... 2-3

2.4 Findings of the Construction Site Sediment and Receiving Water Risk Determination 2-

2.5 Construction Schedule .................................................................................................. 2-5

2.6 Potential Construction Activity and Pollutant Sources ................................................ 2-6

2.7 TMDL Requirements .................................................................................................... 2-6

2.8 Identification of Non-Stormwater Discharges ............................................................. 2-6

2.9 Required Site Map Information .................................................................................... 2-7

Section 3 Best Management Practices .......................................................... 3-1

3.1 Schedule for BMP Implementation .............................................................................. 3-1

3.2 Erosion and Sediment Control ..................................................................................... 3-2

3.2.1 Erosion Control ........................................................................................................ 3-3

3.2.2 Sediment Controls ................................................................................................... 3-5

CASQA Traditional SWPPP Template v August 2023

3.3 Non-Stormwater Controls and Waste and Materials Management ............................. 3-7

3.3.1 Non-Stormwater Controls ....................................................................................... 3-7

3.3.2 Materials Management and Waste Management ................................................... 3-11

3.4 TMDL-Related BMPs .................................................................................................. 3-14

3.5 Post Construction Stormwater Management Measures ............................................. 3-14

Section 4 BMP Inspection and Maintenance ................................................ 4-1

4.1 BMP Inspection and Maintenance ............................................................................... 4-1

Section 5 Training ........................................................................................ 5-1

Section 6 Responsible Parties and Operators............................................... 6-1

6.1 Responsible Parties ....................................................................................................... 6-1

6.2 Contractor List .............................................................................................................. 6-3

Section 7 Construction Site Monitoring Program ........................................ 7-1

7.1 Purpose ..................................................................................................................... 7-1

7.2 Applicability of Permit Requirements ...................................................................... 7-1

7.3. Weather and Precipitation Event Tracking .............................................................. 7-1

7.4 Monitoring Locations .............................................................................................. 7-2

7.5 Safety and Monitoring Exemptions ......................................................................... 7-2

7.6 Visual Monitoring .................................................................................................... 7-3

7.7 Water Quality Sampling and Analysis ..................................................................... 7-7

7.8 Active Treatment System Monitoring.....................................................................7-21

7.9 Passive Treatment Monitoring ...............................................................................7-21

7.10 Watershed Monitoring Option .............................................................................. 7-22

7.11 Quality Assurance and Quality Control ................................................................. 7-22

7.12 Records Retention ................................................................................................. 7-24

Section 8 References .................................................................................... 8-1

CASQA Traditional SWPPP Template vi August 2023

Appendices

Appendix A: Site Maps and Drawings

Appendix B: Permit Registration Documents

Appendix C: SWPPP Amendment QSD Certifications

Appendix D: Submitted Changes of Information

Appendix E: Construction Schedule

Appendix F: Construction Activities, Materials Used, and Associated Pollutants

Appendix G: CASQA Stormwater BMP Handbook: Construction Fact Sheets

Appendix H: BMP Inspection Form

Appendix I: Training Forms

Appendix J: Responsible Parties

Appendix K: Contractors and Subcontractors

Appendix L: Calculations

Appendix M: Weather Reports

Appendix N: Monitoring Records

Appendix O: Example Storm Event Monitoring Forms

Appendix P: Field Meter Instructions

Appendix Q: Supplemental Information

Appendix R: Active Treatment System and Passive Treatment Plans

Appendix S: Construction General Permit

CASQA Traditional SWPPP Template vii August 2023

Qualified SWPPP Developer

Approval and Certification of the Stormwater Pollution Prevention Plan

Project Name: Fire Station 227

Project Number/ID:

[if applicable]

“This Stormwater Pollution Prevention Plan and its appendices were prepared under my direction to meet the requirements of the California Construction Stormwater General Permit (Order No. 2022- 0057-DWQ). I certify that I am a Qualified SWPPP Developer in good standing as of the date signed below and will maintain up to date credentials for the duration of the project.”

6/30/2025

QSD Signature

Leidy Stephania Hernandez P.E., QSD

Date

C97548

QSD Name

Engineer IV/ERSC Inc

QSD Certificate Number

909-890-1255

Title and Affiliation shernandez@erscinc.com

Telephone Number

Email

CASQA Traditional SWPPP Template for the 2022 CGP viii August 2023

Amendment Log

Project Name: Fire Station 227

Project Number/ID:

[if applicable]

Amendment No.

Date Brief Description of Amendment

(include section and page number) Prepared and Approved By

Name:

QSD#

The SWPPP will be revised when:

• There is a 2022 CGP violation (2022 CGP Section VI.Q.1);

• There is a reduction or increase in total disturbed acreage (2022 CGP Section III.F.2. and F.4);

• BMPs are not effective and are not resulting in a reduction or elimination of pollutants in stormwater discharges and authorized non-stormwater discharges (2022 CGP Section VI.Q.1 and Attachment E Section III.C.5);

• There is a change in the project duration that changes the project Risk Type (2022 CGP Section III.F.1);

• Dischargers with projects where all construction activities (including passive treatment, active treatment systems, and/or active equipment) will be suspended for 30 days or more (2022 CGP Section III.G);

• There is a change in construction or operations that may affect the discharge of pollutants to surface waters, groundwater(s), or a municipal separate storm sewer system (MS4) (2022 CGP Sections IV.O. and VI.Q.1); or

When deemed necessary by the QSD. The QSD has determined that the changes listed in Table 1-1 can be field determined by the QSP. All other changes will be made by the QSD as formal amendments to the SWPPP. Note that the 2022 CGP requires that the QSD “revise the SWPPP to address potential problems identified by visual inspections, sampling data, comments from a QSP, or their own site observations (2022 CGP Section V.C.2.).

SWPPP Amendment QSD Certifications are located in Appendix C.

CASQA Traditional SWPPP Template 1-1 August 2023

Section 1 SWPPP Requirements

1.1 INTRODUCTION

This Stormwater Pollution Prevention Plan (SWPPP) is designed to comply with California’s General Permit for Stormwater Discharges Associated with Construction and Land Disturbance Activities (2022 CGP), State Water Resources Control Board (State Water Board) Order No. 2022-0057-DWQ (NPDES No. CAS000002) (Appendix S). This SWPPP has been prepared following the 2022 CGP SWPPP Template for Traditional Projects provided in the California Stormwater Quality Association (CASQA) Stormwater Best Management Practice (BMP) Handbook: Construction (CASQA 2023).

This project is considered a traditional construction project.

In accordance with the 2022 CGP, Section IV.O, this SWPPP is designed to address the following:

• Identification of all pollutants, their sources, and control mechanisms, including sources of sediment associated with all construction activities (e.g., sediment, paint, cement, stucco, cleaners, site erosion);

• Pollutant source assessments, including a list of potential pollutant sources and identification of site areas where additional BMPs are necessary to reduce or prevent pollutants in stormwater and authorized non-stormwater discharges, per the minimum requirements when developing the pollutant source assessment;

• Description of site-specific BMPs implemented to reduce or eliminate stormwater pollution;

• Where not otherwise required to be under a Regional Water Quality Control Board (Regional Water Board) permit, all non-stormwater discharges are identified and either eliminated, controlled, or treated;

• Site BMPs are effective and result in the reduction or elimination of pollutants in stormwater discharges and authorized non-stormwater discharges from construction activity to the Best Available Technology/Best Control Technology (BAT/BCT) standard;

and;

• Stabilization BMPs are installed to reduce or eliminate pollutants after construction is completed are effective and maintained; and

• Calculations and design details, as well as BMP controls, are complete and correct.

The Fire Station 227 project (Project, or Site) comprises approximately 1.82 acres, of which 1.82 acres will be disturbed. The Project is located at 180 W. 38th St in San Bernadino, California.

The property is owned by the County of San Bernardino and is being developed by San Bernardino County/Project and Facilities Management Department. The project’s location is shown on the Site Maps in Appendix A.

1.2 PERMIT REGISTRATION DOCUMENTS

Required Permit Registration Documents (PRDs) shall be submitted to the State Water Board via the Stormwater Multi Application and Report Tracking System (SMARTS) by the LRP or DAR. The project-specific PRDs include (2022 CGP Section III.A):

1. Notice of Intent (NOI);

CASQA Traditional SWPPP Template 1-2 August 2023

2. Risk Level Determination (Construction Site Sediment and Receiving Water Risk Determination);

3. Site Drawings and Map;

4. SWPPP;

5. Applicable plans, calculations, and other supporting documentation for compliance with the Phase I or Phase II municipal separate storm sewer system (MS4) post construction requirements or the post-construction standards of the 2022 CGP:

• Attachment or web-source containing the applicable Phase I or Phase II MS4 post construction requirements;

• The post construction plans and calculations submitted to or approved by the applicable Phase I or Phase II MS4; and/or

• Post-construction water balance calculation;

6. Dischargers proposing an alternate K-factor or LS-factor must submit documentation to support the site-specific factors, if applicable;

7. Active Treatment System (ATS) Plan, if applicable;

8. Passive Treatment Plan, if applicable;

9. Dewatering Plan, if applicable;

10. Annual Fee per the current 23 California Code of Regulations Chapter 9 fee schedule for National Pollutant Discharge Elimination System (NPDES) stormwater permits; and

11. Signed Certification Statement (LRP Certification is provided electronically with SMARTS PRD submittal).

Site Maps can be found in Appendix A. A copy of the submitted PRDs shall also be kept in Appendix B along with the Waste Discharge Identification (WDID) confirmation.

1.3 SWPPP AVAILABILITY AND IMPLEMENTATION

The SWPPP will be available at the construction site during working hours list on the title sheet and Section 7.5, while construction is occurring and shall be made available upon request by a federal, state, or municipal inspector. A current copy of the site-specific SWPPP and any site inspection reports required by the 2022 CGP may be kept in electronic format at the site so long as the information requested by a federal, state, or municipal inspector can be made available during an inspection. Legible maps in hard copy must be available at the site (2022 CGP Section

IV.O.1.).

The SWPPP must be implemented at the appropriate level to protect water quality at all times throughout the life of the project. The SWPPP must remain on the site during construction activities, commencing with the initial mobilization and ending with the termination of coverage under the 2022 CGP.

1.4 SWPPP AMENDMENTS

SWPPP changes or amendments will be uploaded through SMARTS within 30 calendar days.

The SWPPP will be revised when:

• If there is a 2022 CGP violation (2022 CGP Section VI.Q.1);

CASQA Traditional SWPPP Template 1-3 August 2023

• There is a reduction or increase in total disturbed acreage (2022 CGP Section III.F.2 and F.4.);

• BMPs are not effective and are not resulting in a reduction or elimination of pollutants in stormwater discharges and authorized non-stormwater discharges (2022 CGP Section VI.Q.1 and Attachment D Section III.C.5);

• There is a change in the project duration that changes the project’s risk level (2022 CGP Section III.F.1); or

• Dischargers with projects where all construction activities (including passive treatment, active treatment systems, and/or active equipment) will be suspended for 30 days or more (2022 CGP Section III.G.).

Additionally, the SWPPP will be amended when:

• There is a change in construction or operations that may affect the discharge of pollutants to surface waters, groundwater(s), or a municipal separate storm sewer system (MS4) (2022 CGP Sections IV.O. and VI.Q.1); or

When deemed necessary by the QSD. The QSD has determined that the changes listed in Table 1-1 can be field determined by the QSP. All other changes will be made by the QSD as formal amendments to the SWPPP. Note that the 2022 CGP requires that the QSD revise the SWPPP to address potential problems identified by visual inspections, sampling data, comments from a QSP, or their own site observations (2022 CGP Section V.C.2.).

The following items shall be included in each amendment:

• Who requested the amendment;

• The location of proposed change;

• The reason for change;

• The original BMP(s) proposed, if any;

• The new BMP(s) proposed; and

• QSD certification.

SWPPP amendments will be logged at the front of the SWPPP and SWPPP Amendment QSD certifications will be located in Appendix C. The SWPPP text will be revised, replaced and/or hand annotated as necessary to properly convey the amendment. SWPPP amendments must be made by a QSD. The following changes have been designated by the QSD as “to be field determined” and constitute minor changes that the QSP may implement based on field conditions.

Table 1-1 List of Changes to be Field Determined

Candidate changes for field location or determination by QSP (1)

Check changes that can be field located or field determined by

QSP

Increase quantity of an Erosion or Sediment Control Measure

Yes

Relocate/add stockpiles or stored materials Yes

Relocate or add toilets Yes

CASQA Traditional SWPPP Template 1-4 August 2023

Table 1-1 List of Changes to be Field Determined

Candidate changes for field location or determination by QSP (1)

Check changes that can be field located or field determined by

QSP

Relocate vehicle storage and/or fueling locations Yes

Relocate areas for waste storage Yes

Relocate water storage and/or water transfer location

Yes

Changes to access points (entrance/exits) Yes

Change type or location of Erosion or Sediment Control Measure

No

Minor changes to schedule or phases Yes

Changes in construction materials Yes

(1) Any field changes not identified for field location or field determination by the QSP must be made as an amendment by the QSD.

1.5 RETENTION OF RECORDS

Paper or electronic records of documents required by this SWPPP will be retained for a minimum of three years from the date generated or date submitted, whichever is later, for the following items:

• SWPPP;

• Visual monitoring reports;

• Sampling equipment calibration records;

• pH and turbidity sampling field sheets;

• Analytical laboratory reports; and

• Erosion Control Plans

These records will be available at the Site until construction is complete. Records assisting in the determination of compliance with the 2022 CGP will be made available within a reasonable time to the Regional Water Board, State Water Board, or U.S. Environmental Protection Agency (EPA) upon request. Requests by the Regional Water Board for retention of records for a period longer than three years will be adhered to.

1.6 REPORTING

Completed inspection checklists are not required to be submitted to the Regional Water Board.

However, completed inspection checklists will be kept with the SWPPP on-site or electronically.

The 2022 CGP requires that permittees prepare, certify, and electronically submit an Annual Report no later than September 1 of each year. Reporting requirements are identified in 2022 CGP Section VI.P. Annual reports will be filed in SMARTS and in accordance with information required by the online forms.

Planned changes in site construction activities that may result in non-compliance with the 2022 CGP are required to be provided in writing to the Regional Water Board and local stormwater agency in advance of the changes.

CASQA Traditional SWPPP Template 1-5 August 2023

If a 2022 CGP discharge violation occurs, the QSP will immediately notify the LRP. The LRP will include information on the violation with the Annual Report. Corrective measures will be implemented immediately following identification of the discharge or written notice of non-compliance from the Regional Board. Discharges and corrective actions must be documented and include the following items:

• The date, time, location, nature of operation, and type of unauthorized discharge;

• The cause or nature of the notice or order;

• The BMPs deployed before the discharge event, or prior to receiving notice or order; and

• The date of deployment and type of BMPs deployed after the discharge event, or after receiving the notice or order, including additional measures installed or planned to reduce or prevent re-occurrence.

1.7 CHANGES TO PERMIT COVERAGE

The 2022 CGP allows for the reduction or increase of the total acreage covered under the 2022 CGP when: a portion of the project is complete and/or conditions for termination of coverage have been met; when ownership of a portion of the project is purchased by a different entity; or when new acreage is added to the project.

Modified PRDs will be filed electronically through a Change of Information (COI) within 30 days of a reduction or increase in total disturbed area if a change in permit-covered acreage is to be sought. The SWPPP will be modified appropriately and will be logged at the front of the SWPPP. SWPPP Amendments QSD Certifications will be located in Appendix C. COIs submitted electronically via SMARTS can be found in Appendix D.

1.8 NOTICE OF TERMINATION

A Notice of Termination (NOT) must be submitted electronically by the LRP or DAR via SMARTS to terminate coverage under the 2022 CGP.

According to the requirements of 2022 CGP Section III.H.4., the following final stabilization method will be used to satisfy final stabilization condition requirements:

70 percent final cover method supported by pre- and post-project photographs demonstrating stabilization.

RUSLE or RUSLE2 method with computation proof supported by pre- and post-project photographs demonstrating stabilization.

Custom method for which Regional Water Board approval has been obtained, supported by documentation required by the Regional Water Board and pre- and pos- project photographs demonstrating stabilization.

The Regional Water Board will consider a construction site complete when the conditions of the 2022 CGP Section III.H., have been met.

The discharger is required to submit the following in SMARTS:

• NOT SMARTS Form;

• QSP-prepared final NOT inspection which includes the QSP name and valid QSP certificate number;

• Final site map with photo orientation references;

CASQA Traditional SWPPP Template 1-6 August 2023

• Photos demonstrating final stabilization and the applicable post-construction BMPs and/or low impact development; and

• A long-term maintenance plan for the post-construction stormwater runoff BMPs and/or low impact development features being implemented.

According to the 2022 CGP, the NOT will be automatically approved within 30 calendar days after the date the NOT was submitted, unless, within the 30 calendar days the Regional Water Board notifies the discharger through SMARTS that the Notice of Termination has been denied, returned, or accepted for review (2022 CGP Section III.H.7).

Note: If an Annual Report has not been filed in the current reporting year, an Annual Report will need to be submitted prior to the NOT.

CASQA Traditional SWPPP Template 2-1 August 2023

Section 2 Project Information

2.1 PROJECT AND SITE DESCRIPTION

2.1.1 Site Description

The Fire Station 227 project site is Risk Level 1 that comprises approximately 1.18 acres and is located at 180 W 38th St, in San Bernardino, California. The project site is located approximately

0.5 miles West of CA State Route 18. The project site is located approximately 550 feet southwest of Mt. View Storm Drain which drains to Twin Creek Channel which is 1.6 miles

Southeast of the project area. The project is located at Lat 34° 15’ 99” N Long 117º 28’ 68” W and is identified on the Site Map in Appendix A.

2.1.2 Existing Conditions

As of the initial date of this SWPPP, the project site is undeveloped. Currently the project is used as a field for Arrowhead Elementary School. There are no known historic sources of contamination at the site.

2.1.3 Existing Drainage

The project site is relatively flat and covered with a grass field and large trees on the east, west, and south sides. The elevation of the project site ranges from 1294 to 1284 feet above mean sea level (msl). Surface drainage at the site currently flows to the south along the city of San Bernardino till it is collected by the Mt View Storm Drain and it’s released onto the Twin Creek Channel which flows to Warm Creek Channel which flows the Santa Ana River Basin which flows to Prado Reservoir. Stormwater is conveyed through surface runoff, storm drain systems, etc.. Existing site topography, drainage patterns, and stormwater conveyance systems are shown on Site Maps in Appendix A.

The project discharges to Warm Creek Channel – Santa Ana River, is not listed for water quality impairment on the most recent 303(d)-list. The water quality impairments (303 (d) list and TMDLs identified in the 2022 CGP Table H-1 for the receiving waters are identified in the Table 2-1.

Table 2-1 Applicable 303(d) List Impairments and TMDLs

Receiving Water Water Quality Impairment

303(d) list TMDL (2022 CGP Table H-1)

WARM CREEK BACTERIA N/A

[Additional compliance actions applicable to the project are discussed in more detail in Section 7.7.]

CASQA Traditional SWPPP Template 2-2 August 2023

2.1.4 Geology and Groundwater

A revised Geotechnical Engineering Report dated September 6, 2024 by Inland Foundation Engineering, Inc. The site is underlain by Hanford coarse sandy loam (HaC). Groundwater occurs beneath the site at approximately 120 feet below ground surface.

2.1.5 Project Description

Project grading will occur on approximately 1.18 acres of the project, which comprises approximately 100% percent of the total area. The limits of grading are shown on Grading Plans in Appendix A. Grading will include both cut and fill activities, with the total graded material estimated to be 1439 cubic yards. Approximately 287 cubic yards of fill material will be imported during grading activities. Graded materials are expected to be balanced onsite. Soil will be stockpiled as needed as shown on Erosion Control in Appendix A. Construction activities will be not phased.

2.1.6 Developed Condition

Post-construction surface drainage will be directed to the southeast corner of the project area as surface flow through stormwater conveyance systems toward. Any overflow conditions will discharge onto 38th and will flow along the curb and gutter system till collected by the Mt View Storm Drain which flows to the Twin Creek Channel which flows to Warm Creek Channel which flows to Santa Ana River Basin which flows to Prado Reservoir.

Post-construction drainage patterns and conveyance systems are presented on Construction Plans in Appendix A.

Table 2-2 Construction Site Estimates

Construction site area 1.18 acres

Total area of disturbance 1.18 acres

Percent impervious before construction 0 %

Runoff coefficient before construction 0.791

Percent impervious after construction 78 %

Runoff coefficient after construction 0.570

2.2 PERMITS AND GOVERNING DOCUMENTS

In addition to the 2022 CGP, the following documents have been taken into account while preparing this SWPPP:

• Regional Water Board requirements

• Basin Plan requirements

• Contract Documents

• Air Quality regulations and permits

CASQA Traditional SWPPP Template 2-3 August 2023

2.3 STORMWATER RUN-ON FROM OFFSITE AREAS

The anticipated off-site run-on to the project site will be directed towards a concrete V-ditch situated along the northern boundary of the proposed Fire Station No. 227. This concrete V-ditch will effectively channel the run off from west to ear, ultimately discharging the 100-year storm event flow through a proposed opening in the retaining wall over Genevive Street right of way.

CASQA Traditional SWPPP Template 2-4 August 2023

2.4 FINDINGS OF THE CONSTRUCTION SITE SEDIMENT AND

RECEIVING WATER RISK DETERMINATION

assessment.A construction site risk assessment has been performed for the project and the resultant risk level is Risk Level 1.

The risk level was determined through the use of the Risk Determination Worksheet (General Permit Appendix 1). The risk level is based on project duration, location, proximity to impaired receiving waters, and soil conditions. A copy of the Risk Level determination submitted on SMARTS with the PRDs is included in Appendix B.

Table 2-3 and Table 2-4 summarize the sediment and receiving water risk factors and document the sources of information used to derive the factors.

Table 2-3 Summary of Sediment Risk

RUSLE

Factor

Value Method for Establishing Value

R 39.16 RUSLE – See Appendix A

K 0.2 RUSLE – See Appendix A, KMZ files provided by the Water Board

LS 1.19 RUSLE – See Appendix A, KMZ files provided by the Water Board

Total Predicted Sediment Loss (tons/acre) 9.32

Overall Sediment Risk Low Sediment Risk < 15 tons/ acre Medium Sediment Risk >= 15 and < 75 tons/acre High Sediment Risk >= 75 tons/acre

☒ Low

☐ Medium

☐ High

Runoff from the project site discharges into 38th St that discharge into Warm Creek Channel which flows into Santa Ana River Basin which drains to Prado Reservoir.

Table 2-4 Summary of Receiving Water Risk

Receiving Water Name

303(d) Listed for Sediment Related Pollutant (1)

TMDL for Sediment Related Pollutant (1)

Beneficial Uses of

COLD, SPAWN,

and MIGRATORY

(1)

Warm Creek ☐ Yes ☒ No ☐ Yes ☒ No ☐ Yes ☒ No

Overall Receiving Water Risk ☒ Low

☐ High

(1) If yes is selected for any option the Receiving Water Risk is High

Risk Level 1 sites are subject to the narrative effluent limitations specified in the 2022 CGP, and may be subject to numeric effluent limits for applicable TMDLs, dewatering activities, active treatment systems and passive treatment systems used on site. The narrative effluent limitations require stormwater discharges associated with construction activity to minimize or prevent pollutants in stormwater and authorized non-stormwater through the use of controls, CASQA Traditional SWPPP Template 2-5 August 2023 structures, and best management practices (BMPs). This SWPPP has been prepared to address Risk Level 1 requirements (2022 CGP Attachment D).

2.5 CONSTRUCTION SCHEDULE

The site sediment risk was determined based on construction taking place between December 2025 and November 2026. Modification or extension of the schedule (start and end dates) may affect risk determination and permit requirements. The LRP shall contact the QSD if the schedule changes during construction to address potential impact to the SWPPP. The estimated schedule for planned work can be found in Appendix E.

CASQA Traditional SWPPP Template 2-6 August 2023

2.6 POTENTIAL CONSTRUCTION ACTIVITY AND POLLUTANT

SOURCES

Appendix F includes a list of construction activities and associated materials that are anticipated to be used onsite as well as the pollutant source assessment form that was completed for the project. These activities and associated materials will or could potentially contribute pollutants, other than sediment, to stormwater runoff.

The anticipated activities and associated pollutants were used in Section 3 to select the BMPs for the project. Locations of anticipated pollutants and associated BMPs are shown on the Site Map in Appendix A.

Additionally, proper measures will be taken to ensure that trench spoils or any other soils disturbed during construction activities that are contaminated are not discharged with stormwater or non-stormwater discharges into storm drains or water bodies (except pursuant to a separate NPDES Permit). If contaminated soils are found on site, and the responsible party cannot be identified or fails to take action, soils will be sampled to determine proper handling and protect public safety. The appropriate local, State, and federal agencies along with the appropriate Regional Water Board will be notified when contaminated soils are observed.

For sampling requirements for non-visible pollutants associated with construction activity, please refer to Section 7.7.1. For a full and complete list of onsite pollutants, refer to the Safety Data Sheets (SDS), which are retained onsite at the construction trailer or are available electronically at the site.

2.7 TMDL REQUIREMENTS

Based on the project’s receiving water and the pollutant source assessment, the following TMDLs are applicable to the project (See 2022 CGP Attachment H).

Table 2-8 Project TMDLs

TMDL Applicable Water Body/ Watershed

Pollutants Additional

TMDL-

Related NAL or NEL

Compliance Actions

N/A

These TMDLs are also identified in Section 2.1.3. The applicable NALs and NELs are also identified in Section 2.4. BMP requirements related to TMDLs are discussed in Section 3.4.

Monitoring requirements related to TMDLs are discussed further in Section 7.7.

2.8 IDENTIFICATION OF NON-STORMWATER DISCHARGES

Non-stormwater discharges into storm drainage systems or waterways, which are not authorized under the 2022 CGP and listed in the SWPPP, or authorized under a separate NPDES permit, are prohibited.

Non-stormwater discharges that are authorized from this project site include the following:

• Irrigation Runoff

CASQA Traditional SWPPP Template 2-7 August 2023

• Street Sweeping Runoff

• Fire Hydrant Testing

• Fire Sprinkler Testing

• Emergency Firefighting Activities

These authorized non-stormwater discharges will be managed with the stormwater and non-stormwater BMPs described in Section 3 of this SWPPP and will be minimized under the direction of the QSP. Additionally, the non-stormwater discharges not applicable to this project are still allowable granted they do not contact potential pollutant sources.

Activities at this site that may result in unauthorized non-stormwater discharges include:

• Dust Control Water

• Grading Water

• Wash Water (Vehicles, Equipment, Tools, Building, etc)

• Dewatering Discharge

• Utility Line Testing & Flushing

• Vehicle & Equipment Use

Steps will be taken, including the implementation of appropriate BMPs, to ensure that unauthorized discharges are eliminated, controlled, disposed, or treated on-site.

Discharges of construction materials and wastes, such as fuel or paint, resulting from dumping, spills, or direct contact with rainwater or stormwater runoff, are also prohibited.

The following discharge(s) have been authorized by (a) regional NPDES permit(s):

• None

2.9 REQUIRED SITE MAP INFORMATION

The construction project’s Site Map(s) showing the project location, surface water boundaries, geographic features, construction site perimeter and general topography, locations of storm drain inlets that receive runoff from the project, and other requirements identified in 2022 CGP Sections IV.O.2. k. and l are located in Appendix A. Table 2-9 identifies Maps or Sheet Nos.

where required elements are illustrated.

Table 2-9 Required Map Information

Included on Map/Plan

Sheet No. (1) Required Element

Pre-Earthwork Drawings

Cover Sheet Site and project boundaries

N/A Areas disturbed during geotechnical or other preconstruction investigation work

CASQA Traditional SWPPP Template 2-8 August 2023

Table 2-9 Required Map Information

Included on Map/Plan

Sheet No. (1) Required Element

Grading Plans Existing roads and trails

N/A Drainage areas

Grading Plans Discharge locations

N/A Existing storm drain system if applicable

Erosion Control Plan

Proposed locations of storage areas for waste

Erosion Control Plan

Proposed locations of construction materials

Erosion Control Plan

Proposed locations of project staging areas

Erosion Control Plan

Proposed locations of stockpiles

Erosion Control Plan

Proposed locations of vehicles, equipment staging and vehicle maintenance

Erosion Control Plan

Proposed locations of loading/unloading materials

Erosion Control Plan

Proposed locations of site access (entrance/exits)

Erosion Control Plan

Proposed locations of fueling, water storage, water transfer for dust control

Erosion Control Plan

Proposed locations of demolition

Erosion Control Plan

Proposed locations of other construction support activities

Construction and Earthwork Drawing(s)

Grading Plans Site layout (grading plans) including roads

Grading Plans Site and project boundaries

Grading Plans/

WQMP

Drainage areas

Grading Plans Discharge locations

N/A Sampling locations

N/A Areas of soil disturbance (temporary or permanent)

Grading Plans Proposed active areas of soil disturbance (cut or fill)

CASQA Traditional SWPPP Template 2-9 August 2023

Table 2-9 Required Map Information

Included on Map/Plan

Sheet No. (1) Required Element

Erosion Control Plan

Proposed locations of erosion control BMPs

Erosion Control Plan

Proposed locations of sediment control BMPs

Erosion Control Plan

Proposed locations of run-off BMPs

N/A Temporary and/or permanent run-on conveyance (if applicable)

N/A Proposed locations of active treatment systems(s) (if applicable)

Erosion Control Plan

Proposed locations of storage areas for waste

Erosion Control Plan

Proposed locations of construction materials

Erosion Control Plan

Proposed locations of project staging areas

Erosion Control Plan

Proposed locations of stockpiles

Erosion Control Plan

Proposed locations of vehicles, equipment and vehicle maintenance

Erosion Control Plan

Proposed locations of loading/unloading materials

Erosion Control Plan

Proposed locations of site access (entrance/exits)

Erosion Control Plan

Proposed locations of fueling, water storage, water transfer for dust control

Erosion Control Plan

Proposed locations of demolition

Erosion Control Plan

Proposed locations of other construction support activities

Erosion Control Plan

Site-specific procedures to implement final stabilization BMPs as soon as reasonably practicable

Notes: (1) Indicate maps or drawings that information is included on (e.g., Vicinity Map, Site Map, Drainage Plans, Grading Plans, Progress Maps.)

CASQA Traditional SWPPP Template 3-1 August 2023

Section 3 Best Management Practices

3.1 SCHEDULE FOR BMP IMPLEMENTATION

BMPs will be implemented as per the schedule indicated in Table 3-1.

Table 3-1 BMP Implementation Schedule

BMP Location Implementation Duration

E r o s io n

C o n tr o l

B M

P s EC-1, Scheduling

N/A Prior to Construction

Entirety of Project

S e d im e n t C o n tr o l B

M P s

SE-1 Silt Fence Perimeters Daily Construction

Activity Entirety of Project

SE-5 Fiber Rolls Toe of 2:1 Slopes Daily Construction

Activity Until NOT filed

SE-7 Street Sweeping All Hardscapes Prior to

Construction Until NOT filed

SE-6 Gravel Bags Around Temp.

Stickpiles

Prior to Construction

Entirety of Project

SE-10 Storm Drain inlet Protection

Around SD Inlets Daily Construction Activity

Entirety of Project

W in d r o s io

C n tr o l B

M

WE-1, Wind Erosion Control

Disturbed Soil After ground Breaking

Until NOT filed

T a c k in g C o n tr o l B

M

TC-1, Stabilized Construction Entrance/Exit

All Egress Locations Prior to Construction

Until track out can be controlled without

N n

S to r m w a te r

C o n tr o l

B M

P s NS-1, Water Conservation Practices

N/A Start of Construction

Entirety of Project

NS-6, Illicit Connection/Discharge

N/A Start of Construction

CASQA Traditional SWPPP Template 3-2 August 2023

Table 3-1 BMP Implementation Schedule

BMP Location Implementation Duration

NS-8, Vehicle and Equipment Cleaning

Equipment Cleaning areas

Start of Construction

Entirety of Project

NS-10, Vehicle and Equipment Maintenance

Equipment Staging Areas

Start of Construction

Entirety of Project

NS-12, Concrete Curing Site Start of Concrete

Operations Entirety of Project

C o n s tr u c ti

M a te r ia l C o n tr o l B

M

W s te

M a n a g e m e n t

C o n tr o l

B M

WM-1, Material Delivery and Storage

Contractors laydown/ storage yards

Prior to Construction

Entirety of Project

WM-2 Material Use Onsite Start of

Construction Entirety of Project

WM-3, Stockpile Management

Onsite Start of Construction

Entirety of Project

WM-4, Spill Prevention and Control

Onsite Start of Construction

WM-5, Solid Waste Management

Onsite Start of Construction

WM-6, Hazardous Waste Management

Onsite Start of Construction

WM-8, Concrete Waste Management

Onsite Start of Construction

WM-9, Sanitary-Septic Waste Management

Onsite Start of Construction

3.2 EROSION AND SEDIMENT CONTROL

Erosion and sediment controls are required by the 2022 CGP to provide effective reduction or elimination of sediment related pollutants in stormwater discharges and authorized non-stormwater discharges from the Site. Applicable BMPs are identified in this section for erosion control, sediment control, tracking control, and wind erosion control.

CASQA Traditional SWPPP Template 3-3 August 2023

3.2.1 Erosion Control

Erosion control, also referred to as soil stabilization, consists of source control measures that are designed to prevent soil particles from detaching and becoming transported in stormwater runoff. Erosion control BMPs protect the soil surface by covering and/or binding soil particles.

This construction project will implement the following practices to provide effective temporary and final erosion control during construction:

1. Preserve existing vegetation where required and when feasible.

2. The area of soil disturbing operations shall be controlled such that the Contractor is able to implement erosion control BMPs quickly and effectively.

3. Stabilize non-active areas within 14 days of cessation of construction activities or sooner if stipulated by local requirements.

4. Control erosion in concentrated flow paths by applying erosion control blankets, check dams, erosion control seeding, or alternate methods.

5. Prior to the completion of construction, apply permanent erosion control to remaining disturbed soil areas.

Sufficient erosion control materials shall be maintained onsite to allow implementation in conformance with this SWPPP.

The following erosion control BMP selection table, Table 3-2 indicates the BMPs that will be implemented to control erosion on the construction site. Fact Sheets for temporary erosion control BMPs are provided in Appendix G.

These temporary erosion control BMPs shall be implemented in conformance with the following guidelines and as outlined in the BMP Factsheets provided in Appendix G. If there is a conflict between documents, the Site Map will prevail over narrative in the body of the SWPPP or guidance in the BMP Fact Sheets. Site specific details in the Site Map prevail over standard details included in the Site Map. The narrative in the body of the SWPPP prevails over guidance in the BMP Fact Sheets.

CASQA Traditional SWPPP Template 3-4 August 2023

Table 3-2 Erosion Control BMPs

CASQA

Fact Sheet

BMP Name Considered for the Project (1)

BMP Used If not used, state reason and alternate BMP, if applicable

YES NO

EC-1 Scheduling ✓ ✓

EC-2

Preservation of Existing Vegetation

✓ ✓ Vegetation to be removed

EC-3 Hydraulic Mulch ✓(2) ✓ No Major Slopes, stockpiles, burn areas

EC-4 Hydroseed ✓(2) ✓ Project Size

EC-5 Soil Binders ✓(2) ✓ No existing vegetation

EC-6 Straw Mulch ✓(2) ✓ Project Size

EC-7 Geotextiles and Mats ✓(2) ✓ No major slopes

EC-8 Wood Mulching ✓(2) ✓ No existing vegetation

EC-9

Earth Dike and Drainage Swales

✓(3) ✓ Project Size

EC-10 Velocity Dissipation Devices ✓(3) ✓ Project Size

EC-11 Slope Drains ✓(3) ✓ No major slopes

EC-12 Stream Bank Stabilization ✓ N/A

EC-14 Compost Blankets ✓(2) ✓ N/A

EC-15 Soil Preparation-Roughening ✓ ✓ N/A

EC-16 Non-Vegetated Stabilization ✓(2) ✓ N/A

WE-1 Wind Erosion Control ✓ ✓

(1) The 2022 CGP Fact Sheet Section I.R.1.d.through I.R.1.i.describes various BMPs that should be considered for use on the construction site.

(2) The QSD shall ensure implementation of one of the minimum measures listed or a combination thereof to achieve and maintain the Risk Level requirements.

(3) All run-on and runoff from the construction site shall be managed for Risk Level 2 and 3 and Risk Level 1 if the evaluation of quantity and quality of run-on and runoff deems them necessary or visual inspections show that the site requires these controls. Run-on from offsite shall be directed away from all disturbed areas, diversion of offsite flows may require design/analysis by a licensed civil engineer and/or additional environmental permitting.

CASQA Traditional SWPPP Template for the 2022 CGP 3-5 August 2023

Scheduling

Scheduling tactics that the Contractor monitor the weather forecast for rainfall. When rainfall is predicted, adjust the construction to allow the implementation of soil stabilization and sediment treatment controls on all disturbed areas prior to the onset of rain.

Contract shall be prepared year-round to deploy erosion control and sediment control BMPs.

Erosion may be caused during dry seasons by un-seasonal rainfall, wind, and vehicle tracking.

Keep the site stabilized year round and maintain rainy season sediment trapping devices in operational condition.

Wind Erosion Control

Wind erosion control consists of covering and applying water to exposed soil and stockpiles, as needed, to prevent dust nuisance. As a last resort, stockpiles may be covered in plastic to prevent wind erosion. Plastic must be secured through the use of a gravel bags, or other devices, to prevent plastic from being carried by strong gusts.

3.2.2 Sediment Controls

Sediment controls are temporary or permanent structural measures that are intended to complement the selected erosion control measures and reduce sediment discharges from active construction areas. Sediment controls are designed to intercept and settle out soil particles that have been detached and transported by the force of water.

The following sediment control BMP selection table indicates the BMPs that will be implemented to control sediment on the construction site. Fact Sheets for temporary sediment control BMPs are provided in Appendix G.

These temporary sediment control BMPs will be implemented in conformance with the following guidelines and in accordance with the BMP Fact Sheets provided in Appendix G. If there is a conflict between documents, the Site Map will prevail over narrative in the body of the SWPPP or guidance in the BMP Fact Sheets. Site specific details in the Site Map prevail over standard details included in the Site Map. The narrative in the body of the SWPPP prevails over guidance in the BMP Fact Sheets.

CASQA Traditional SWPPP Template 3-6 August 2023

Table 3-3 Temporary Sediment Control BMPs

CASQA

Fact

Sheet BMP Name

Considered for the

Project (1)

BMP used

If not used, state reason and alternate BMP, if applicable

YES NO

SE-1 Silt Fence ✓(2) (3) ✓

SE-2 Sediment Basin ✓ Project Size

SE-3 Sediment Trap ✓ Project Size

SE-4 Check Dams ✓ Project Size

SE-5 Fiber Rolls ✓(2)(3) ✓ ✓

SE-6 Gravel Bag Berm ✓(3) ✓

SE-7 Street Sweeping ✓ ✓

SE-8 Sandbag Barrier ✓ Gravel Bags used

SE-9 Straw Bale Barrier ✓ Using Fiber Rolls

SE-10 Storm Drain Inlet Protection ✓ RL2&3 ✓

SE-11 ATS ✓ Project Size

SE-12

Manufactured Linear Sediment Controls

✓ Other methods available

SE-13 Compost Sock and Berm ✓(3) ✓ Other methods available

SE-14 Biofilter Bags ✓(3) ✓ Other methods available

NA Passive Treatment System ✓ Other methods available

TC-1

Stabilized Construction Entrance and Exit

TC-2 Stabilized Construction Roadway ✓ Project Size

TC-3 Entrance Outlet Tire Wash ✓ Project Size

(1) The 2022 CGPs Fact Sheet Section I.R.1.d through I.R.1.i describes various BMPs that should be considered for use on the construction site.

(2) The QSD shall ensure implementation of one of the minimum measures listed or a combination thereof to achieve and maintain the Risk Level requirements.

(3) All run-on and runoff from the construction site shall be managed. Risk Level 2 and 3 shall provide linear sediment control along toe of slope, face of slope, and at the grade breaks of exposed slope.

CASQA Traditional SWPPP Template 3-7 August 2023

Silt Fence

Silt Fence will be used and meet the minimum requirements as necessary per CASQA Reference BMP’s Handbook.

Gravel Bag Berm

Gravel Bag Berm will be used…