Att 12- Storm Water Pollution Prevention Plan (SWPPP).pdf

STORMWATER POLLUTION PREVENTION PLAN

for

National Park Service Woolsey Fire Time Critical Removal Action

RISK LEVEL 2

Legally Responsible Person (LRP):

Santa Monica Mountains National Recreation Area 401 Hillcrest Drive, Thousand Oaks, CA 91360

David Szymanski David_Szymanski@nps.gov

(805)-370-2342

Project Address:

Nine Properties located within the

Santa Monica Mountains National Recreation Area

SWPPP Prepared by:

Terraphase Engineering, Inc.

1404 Franklin Street, Oakland, CA Hans Kramer, PE, QSD #21027

SWPPP Preparation Date

January 6, 2020

Estimated Project Dates:

Start of Construction:

April 07, 2020

Completion of Construction:

October 05, 2020

Woolsey Fire Time Critical Removal Action i January 2020

Table of Contents Table of Contents ........................................................................................................................... i

Qualified SWPPP Developer

Legally Responsible Person

Amendment Log

Section 1 SWPPP Requirements

1.1 Introduction

1.2 Permit Registration Documents

1.3 SWPPP Availability and Implementation

1.4 SWPPP Amendments

1.5 Retention of Records

1.6 Required Non-Compliance Reporting

1.7 Annual Report

1.8 Changes to Permit Coverage

1.9 Notice of Termination

Section 2 Project Information

2.1 Project and Site Description

2.1.1 Project and Site Description

2.1.3 Existing Drainage

2.1.4 Geology and Groundwater

2.2 Permits and Governing Documents

2.3 Stormwater Run-On from Offsite Areas

2.4 Construction Site Sediment and Receiving Water Risk Determination

2.5 Construction Schedule

2.6 Potential Construction Activity and Pollutant Sources

2.7 Identification of Non-Stormwater Discharges

2.8 Required Site Map Information

Section 3 Best Management Practices

3.1 Schedule for BMP Implementation

3.2 Erosion and Sediment Control

3.2.1 Erosion Control

3.2.2 Sediment Controls

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3.3 Non-Stormwater Controls and Waste and Materials Management

3.3.1 Non-Stormwater Controls

3.3.2 Materials Management and Waste Management

3.4 Post construction Stormwater Management Measures

Section 4 BMP Inspection, Maintenance, and Rain Event Action Plans

4.1 BMP Inspection and Maintenance

4.2 Rain Event Action Plans

Section 5 Training

Section 6 Responsible Parties and Operators

6.1 Responsible Parties

6.2 Contractor List

Section 7 Construction Site Monitoring Program

7.1 Purpose

7.2 Applicability of Permit Requirements

7.3. Weather and Rain Event Tracking

7.3.1 Weather Tracking

7.3.2 Rain Gauges

7.4 Monitoring Locations

7.5 Safety and Monitoring Exemptions

7.6 Visual Monitoring

7.6.1 Routine Observations and Inspections

7.6.1.1 Routine BMP Inspections

7.6.1.2 Non-Stormwater Discharge Observations

7.6.2 Rain-Event Triggered Observations and Inspections

7.6.2.1 Visual Observations Prior to a Forecasted Qualifying Rain Event

7.6.2.2 BMP Inspections During an Extended Storm Event

7.6.2.2 Visual Observations Following a Qualifying Rain Event

7.6.3 Visual Monitoring Procedures

7.6.4 Visual Monitoring Follow-Up and Reporting

7.6.5 Visual Monitoring Locations

7.7 Water Quality Sampling and Analysis

7.7.1 Sampling and Analysis Plan for Non-Visible Pollutants in Stormwater Runoff Discharges

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7.7.1.1 Sampling Schedule

7.7.1.2 Sampling Locations

7.7.1.3 Monitoring Preparation

7.7.1.4 Analytical Constituents

7.7.1.5 Sample Collection

7.7.1.6 Sample Analysis

7.7.1.7 Data Evaluation and Reporting

7.7.2 Sampling and Analysis Plan for pH and Turbidity in Stormwater Runoff Discharges

7.7.2.1 Sampling Schedule

7.7.2.2 Sampling Locations

7.7.2.3 Monitoring Preparation

7.7.2.4 Field Parameters

7.7.2.5 Sample Collection

7.7.2.6 Field Measurements

7.7.2.7 Data Evaluation and Reporting

7.7.3 Additional Monitoring Following an NEL Exceedance

7.7.4 Sampling and Analysis Plan for Non-Stormwater Discharges

7.7.4.1 Sampling Schedule

7.7.4.2 Sampling Locations

7.7.4.3 Monitoring Preparation

7.7.4.4 Analytical Constituents

7.7.4.5 Sample Collection

7.7.4.6 Sample Analysis

7.7.4.7 Data Evaluation and Reporting

7.7.5 Sampling and Analysis Plan for Other Pollutants Required by the Regional Water Board……………………………………………………………………………………..56

7.7.6 Training of Sampling Personnel

7.7.7 Sample Collection and Handling

7.7.7.1 Sample Collection

7.7.7.2 Sample Handling

7.7.7.3 Sample Documentation Procedures

7.8 Active Treatment System Monitoring

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7.9 Bioassessment Monitoring

7.10 Watershed Monitoring Option

7.11 Quality Assurance and Quality Control

7.11.1 Field Logs

7.11.2 Clean Sampling Techniques

7.11.3 Chain of Custody

7.11.4 QA/QC Samples

7.11.4.1 Field Duplicates

7.11.4.2 Equipment Blanks

7.11.4.3 Field Blanks

7.11.4.4 Travel Blanks

7.11.5 Data Verification

7.12 Records Retention

Section 8 References

CSMP Attachment 1: Weather Reports

CSMP Attachment 2: Monitoring Records

CSMP Attachment 3: Example Forms

CSMP Attachment 4: Field Meter Instructions

CSMP Attachment 5: Supplemental Information

Appendices

A Calculations B Site Maps C Permit Registration Documents D SWPPP Amendment Certifications E Submitted Changes to PRDs F Construction Schedule G Construction Activities, Materials Used, and Associated Pollutants H CASQA Storm Water Management Plan BMP Handbook I BMP Inspection Form J Project Specific Rain Event Action Plan Template K Training Reporting Form L Responsible Parties M Contractors and Subcontractors N Construction General Permit

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Qualified SWPPP Developer Approval and Certification of the Stormwater Pollution Prevention Plan

Project Name:

National Park Service Woolsey Fire Debris Cleanup

Project Number/ID: S073.001.004

“This Stormwater Pollution Prevention Plan and Attachments were prepared under my direction to meet the requirements of the California Construction General Permit (SWRCB Orders No. 2009-009- DWQ as amended by Order 2010-0014-DWQ). I certify that I am a Qualified SWPPP Developer in good standing as of the date signed below.”

January 6, 2020

QSD Signature

Hans Kramer

Date

21027

QSD Name

Principal Engineer, Terraphase Engineering

QSD Certificate Number

510 645-1850

Title and Affiliation hans.kramer@terraphase.com

Telephone Number

Email

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Legally Responsible Person Approval and Certification of the Stormwater Pollution Prevention Plan

Project Name:

National Park Service Woolsey Fire Debris Cleanup

Project Number/ID: S073.001.004

“I certify under penalty of law that this document and all Attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system or those persons directly responsible for gathering the information, to the best of my knowledge and belief, the information submitted is, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations."

Signature of Legally Responsible Person Date

David Szymanski

805-370-2342

Name of Legally Responsible Person Telephone Number

Signature of Approved Signatory Date

John Colter Chisum 805-370-2327

Name of Approved Signatory Telephone Number

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Amendment Log

Project Name: National Park Service Woolsey Fire Debris Cleanup

WDID:

Amendment No.

Date Brief Description of Amendment, include section and page number

Prepared and Approved By

Name:

QSD#

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Section 1 SWPPP Requirements

1.1 INTRODUCTION

The Woolsey Fire Time Critical Removal Action Project of the Santa Monica Mountains National Recreation Area (SAMO). comprises approximately 9.2 acres of soil disturbance area, including unpaved access roads for all 9 cleanup locations. A total of 31 structures were destroyed during the Woolsey Fire in November 2018, those structures were located within the nine project areas of the site named: Paramount Ranch, Peter Strauss Ranch, Rocky Oaks, Cooper/Brown (the Rocky Oaks and Cooper/Brown properties have been combined and will be referred to as Rocky Oaks), Arroyo Sequit, Circle X Ranch, Morrison Ranch, Dragon Property and Miller Property. The property is owned by the National Park Service (NPS). The project locations are shown on the Site Maps in Appendix B. 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 (General Permit) Order No.

2009-0009-DWQ as amended by Order No. 2010-0014-DWQ (NPDES No. CAS000002) issued by the State Water Resources Control Board (State Water Board). The National Park Service will act as the legally responsible agency under the General Permit. This SWPPP has been prepared following the SWPPP Template provided on the California Stormwater Quality Association Stormwater Best Management Practice Handbook Portal: Construction (CASQA, 2010). In accordance with the General Permit, Section XIV, this SWPPP is designed to address the following:

Pollutants and their sources, including sources of sediment associated with construction, construction site erosion and other activities associated with construction activity are controlled;

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;

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 Legally Responsible Person (LRP), or authorized personnel (i.e., Approved Signatory) under the direction of the LRP. The project-specific PRDs include:

1. Notice of Intent (NOI);

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

3. Site Map;

4. Annual Fee;

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5. Signed Certification Statement (LRP Certification is provided electronically with SMARTS PRD submittal); and

6. SWPPP.

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

1.3 SWPPP AVAILABILITY AND IMPLEMENTATION

The discharger shall make the SWPPP available at the construction site during working hours (see Section 7.5 of CSMP for working hours) while construction is occurring and shall be made available upon request by a State or Municipal inspector. When the original SWPPP is retained by a crewmember in a construction vehicle and is not currently at the construction site, current copies of the BMPs and map/drawing will be left with the field crew and the original SWPPP shall be made available via a request by radio/telephone. (CGP Section XIV.C)

The SWPPP shall be implemented concurrently with the start of ground disturbing activities.

1.4 SWPPP AMENDMENTS

The SWPPP should be revised:

If there is a General Permit violation.

When there is a reduction or increase in total disturbed acreage (General Permit Section II Part C).

When BMPs do not meet the objectives of reducing or eliminating pollutants in stormwater discharges.

Additionally, the SWPPP shall be amended:

When there is a change in construction or operations which may affect the discharge of pollutants to surface waters, groundwater(s), or a municipal separate storm sewer system

(MS4);

When there is a change in the project duration that changes the project’s risk level; 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 shall be made by the QSD as formal amendments to the SWPPP.

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 proposed, if any; and

The new BMP proposed.

Amendments shall be logged at the front of the SWPPP and certification kept in Appendix D.

The SWPPP text shall be revised, replaced, and/or hand annotated as necessary to properly

Woolsey Fire Time Critical Removal Action 6 January 2020 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

X

Relocate/Add stockpiles or stored materials X

Relocate or add toilets X

Relocate vehicle storage and/or fueling locations X

Relocate areas for waste storage X

Relocate water storage and/or water transfer location X

Changes to access points (entrance/exits) X

Change type of Erosion or Sediment Control Measure X

Changes to location of erosion or sediment control X

Minor changes to schedule or phases X

Changes in construction materials X

(1) Any field changes not identified for field location or field determination by QSP must be approved by QSD

1.5 RETENTION OF RECORDS

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

The date, place, and time of facility inspections, sampling, visual observations (inspections), and/or measurements, including precipitation;

The individual(s) who performed the facility inspections, sampling, visual observations (inspections), and /or measurements;

The date and approximate time of analyses;

The individual(s) who performed the analyses;

A summary of analytical results from the last three years, the method detection limits and reporting limits, and the analytical techniques or methods used;

Rain gauge readings from site inspections;

QA/QC records and results;

Non-storm water discharge inspections and visual observations (inspections) and storm water discharge visual observation records;

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Visual observation and sample collection exemptions records;

NAL Exceedance Reports;

The records of any corrective actions and follow-up activities that resulted from analytical results, visual observations (inspections), or inspections; and Results of field measurements and laboratory analyses must be kept in the SWPPP.

These records shall be available at the Site until construction is complete. Records assisting in the determination of compliance with the General Permit shall 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 shall be adhered to.

1.6 REQUIRED NON-COMPLIANCE REPORTING

If a discharge violation occurs, the QSP shall immediately notify the LRP and the LRP shall file a violation report electronically to the Regional Water Board within 30 days of identification of non-compliance using SMARTS. Corrective measures will be implemented immediately following the discharge or written notice of non-compliance from the Regional Water Board.

Discharges and corrective actions will be documented on the NAL Exceedance Site Evaluation Report Form in CSMP Attachment 3 “Example Forms.”

The report to the LRP and to the Regional Water Board will contain 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 control measures (BMPs) deployed before the discharge event, or prior to receiving notice or order.

The date of deployment and type of control measures (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.

Reporting requirements for Numeric Action Level (NAL) and Numeric Effluent Limitation (NEL) exceedances are discussed in Section 7.7.2.7.

1.7 ANNUAL REPORT

The General Permit requires that permittees with coverage for more than 3 months prepare, certify, and electronically submit an Annual Report no later than September 1st of each year.

Reporting requirements are identified in Section XVI of the General Permit. Annual reports will be filed in SMARTS and in accordance with information required by the on-line forms.

1.8 CHANGES TO PERMIT COVERAGE

The General Permit allows for the reduction or increase of the total acreage covered under the General Permit 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.

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Modified PRDs shall be filed electronically 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 shall be modified appropriately, shall be logged at the front of the SWPPP and cetrification of SWPPP amendments are to be kept in Appendix D. Updated PRDs submitted electronically via SMARTS can be found in Appendix E.

1.9 NOTICE OF TERMINATION

A Notice of Termination (NOT) must be submitted electronically by the LRP via SMARTS to terminate coverage under the General Permit. The NOT must include a final Site Map and representative photographs of the project site that demonstrate final stabilization has been achieved. The NOT shall be submitted within 90 days of completion of construction. The Regional Water Board will consider a construction site complete when the conditions of the General Permit, Section II.D have been met.

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Section 2 Project Information

2.1 PROJECT AND SITE DESCRIPTION

2.1.1 Project and Site Description

The Site comprises approximately 9.2 acres including unpaved access roads for all 9 cleanup locations. The project consists of 9 properties that were part of the 21,000 acres of National Park Service (NPS) lands burned during the 2018 Woolsey Fire within the SAMO. The 9 properties include the Paramount Ranch, Peter Strauss Ranch, Rocky Oaks and Cooper/Brown Park Unit, Arroyo Sequit, Circle X Ranch, Morrison Ranch, Dragon Property and Miller Property. All properties are located within Los Angeles County, CA, with the exception of Circle X Ranch, which is located within Ventura County, CA. The highest priority for SAMO is to remove and safely dispose of the debris at these locations from buildings and structures that were destroyed in the Woolsey Fire. Lead Builders is the construction contractor responsible for the locations and construction activities included in this SWPPP.

The Arroyo Sequit Park Unit (Arroyo Sequit) is located at 34138 Mulholland Highway in Malibu, CA. The property was privately owned from 1903 to 1985 when it was sold to the State of California, was managed through a conservancy until 1991 when it was acquired by the NPS.

The property had a picnic area for visitor use, a pump house, a wood framed ranch house that served as a ranger residence, a survey office, a vault toilet and a barn. The Woolsey fire completely destroyed all of the buildings, structures and features within Arroyo Sequit. Cleanup in this area will include the removal of all structural debris, as well as water, sewer, and electrical utilities, where present, and will disturb approximately 0.8 acres.

The Circle X Ranch Park Unit (Circle X) is located at 12896 Yerba Buena road in Malibu. Circle X was a former Boy Scout Camp that was leased by the Boy Scouts of America (BSA) from 1951 to 1979, deeded to the BSA, who sold it to the Santa Monica Mountains Conservancy in 1987 and was taken over by the NPS in 1989. The property has been managed as a campground with public toilets and a basketball court since 1989. The Woolsey fire completely destroyed all of the buildings, structures and features within Circle X. Cleanup in this area will include the removal of all structural debris, as well as water, sewer, and electrical utilities, where present, and will disturb approximately 0.9 acres.

The Dragon Property/Zuma and Trancas Canyons Park Unit (Dragon Property) is a recent NPS acquisition and addition to the Zuma and Trancas park unit. Several trailer chassis, an old school bus and remnants of a pump house were observed on the property. No historic resources were identified. The Woolsey fire completely destroyed several airstream trailers parked on the Dragon property. Heavy rains subsequent to the Woolsey Fire resulted in a section of the Dragon property flooding, resulting in an old bus parked at the site filling up with rocks and soil. Access to the site will be via the original and only unpaved road, as shown in Figure 4. The access road has some incised tread sections that will be bladed smooth with a grader to allow safe access to the site. Cleanup in this area will include the removal of bus, all structural debris, as well as water, sewer, and electrical utilities, where present, and will disturb approximately 0.9 acres.

Woolsey Fire Time Critical Removal Action 10 January 2020

The Miller property/Castro Crest park unit (Miller Property) is a recent NPS acquisition and addition to the Castro Crest park unit. The property was surveyed in May 2019, and no historic resources were identified. The Woolsey fire completely destroyed a roofed area that covered three recreational vehicles and a plywood shed. Metal debris from the three trailer chassis of unknown ages was observed. Cleanup in this area will include the removal of all trailer debris, as well as water, sewer, and electrical utilities, where present, and will disturb approximately 0.6 acres. Additionally, there were several pit toilet holes observed adjacent to the trailer chassis, which will be filled during the clean-up efforts.

The Morrison Ranch/Cheeseboro and Palo Comado Canyons Park Unit (Morrison Ranch) was a multi-component site that included historic ranch features and a prehistoric lithic scatter.

Numerous surveys and excavations on the site reported finding an assortment of historic artifacts, some dating back to the 1800s, however, there is minimal potential for archeological research value within the burnt ruins due to past excavation of the land surrounding the house.

The house was built in the early 1900’s and was added to later on in the 1900’s from the Morrison family and when it was used in the movie industry. The Woolsey fire completely destroyed the Morrison house, chicken coop and wood corral/squeeze chute. Cleanup in this area will include the removal of all structural debris, as well as water, sewer, and electrical utilities, where present, and will disturb approximately 0.3 acres.

The Paramount Ranch Park Unit (Paramount Ranch), is one of the last remaining southern California movie ranches that was used by the Hollywood movie studios from the 1920’s to 1940’s. It is a rural historic landscape which encompasses 680 acres from the former Paramount Studio Movie Ranch, from which, there were 4 historic and 7 non-historic buildings and structures, including the Race Track Bridge, that were destroyed in the Woolsey Fire. Paramount Ranch is the major NPS visitor destination in the Santa Monica Mountains. It includes extensive recreational trails, venues for public and private events, and a setting for filming movies and television shows. The buildings and structures at Paramount Ranch destroyed in the Woolsey fire included both permanent and temporary structures (movie sets) that made up “Western Town”.

Project activities in this area will include the removal of all structural debris, as well as water, sewer and electrical utilities, where present. There will be two staging areas for this location, one immediately west of the former pavilion, and the other along Paramount Ranch Road, immediately east of the site cleanup, as shown in Figure 7. Contaminated soil will be removed and hauled off site to a certified contaminated waste facility. Contaminated soil depth will be determined through soil testing, with 4-9 inches expected. Excavated areas will be reestablished with compacted certified weed free fill material. The site will be returned to current finish grade.

Cleanup activities on this site will disturb approximately 3.2 acres

The Peter Strauss Ranch Park Unit (Peter Strauss Ranch) was constructed in the 1920’s as a retreat. It was developed as a fee-based recreational and amusement park in 1939 and in 1977, it was acquired by Peter Strauss and conveyed to the Santa Monica Mountains Conservancy to allow for future public use. In 1987, the property title was transferred to the federal government to be managed by the Santa Monica Mountains Conservancy. In 2006, the Peter Strauss Ranch property was determined to be eligible for the National Register of Historic Places (NHRP) from the California State Historic Preservation Office (SHPO). The main house, radio house/guest house, and storage shed were altered by the Woolsey fire but survived with sufficient integrity to

Woolsey Fire Time Critical Removal Action 11 January 2020 remain historically significant. Cleanup for the main house will include removal of the damaged western wall and removal of all debris located within the perimeter footing of the main house.

Debris includes the chimney and all remaining building materials. There will be one staging area at this location located in the open space to the east of the main house, as shown in Figure 8.

Additionally, two hazardous historic trees that were burned will be removed. The South, East and North walls will be retained with the intent that they may be used during a later reconstruction phase. Cleanup activities on this site will disturb approximately 1.1 acres.

The Rocky Oaks and Cooper/Brown Park Units (Rocky Oaks) is located at the intersection of Mulholland Highway and Kanan Road in Malibu. Rocky Oaks contained trails, a seasonal pond, three buildings, a chicken coop, amphitheater, vault toilet, and a variety of wildlife habitat plant communities. Architectural documentation and consultation with the SHPO in 2012 determined that the ranch residence and associated structures were historic in age but not eligible to the NHRP due to alterations and additions prior to NPS acquisition. The Woolsey fire completely destroyed all of the buildings, structures and features within Rocky Oaks and adjacent NPS properties. Cleanup in this area will include the removal of all structural debris, as well as water, sewer, and electrical utilities, where present. Building sites will have weed free structural fill material placed and compacted in 4” lifts to return each site to original grade. Cleanup activities on this site will disturb approximately 1.4 acres.

2.1.3 Existing Drainage

The project sites are located in the Santa Monica Mountains. The elevation of each site ranges from 600 to 1800 feet above the mean sea level (MSL), and is detailed in Table 2.1 along with the surface drainage flow from each property. Stormwater is conveyed through surface runoff.

Stormwater discharges from the site are considered direct discharges, as defined by the State Water Board, into the frontal Pacific Ocean and Santa Monica Bay because they lie directly downgradient of the work areas.

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Table 2.1 Property Location Drainage Features

Property Location Approximate Elevation (feet above

MSL)

Surface Flow Drainage

Arroyo Sequit 1160 East Fork Arroyo Sequit Stream

Circle X Ranch 1690 West Fork Arroyo Sequit Stream

Dragon Property 600 Trancas Canyon Creek

Miller Property 1880 Unknown Creek to Escondido Canyon Creek

Morrison Ranch 990 Unknown Creek to Medea Creek 2: Above confluence with Lindero

Paramount Ranch 750 Medea Creek: Lake to Confluence with Lindero

Peter Strauss Ranch 760 Cold Creek/Malibu Creek

Rocky Oaks 1750 Unknown Stream to Ramirez Canyon Creek

2.1.4 Geology and Groundwater

The properties are underlain by a variety of soil types and profiles which are detailed in Table

2.1 (Natural Resource Conservation Service Webb Soil Survey: National Cooperative Soil Survey, 2019). No known cases of groundwater or soil contamination were identified on the State Water Board website, Geotracker (http://geotracker.waterboards.ca.gov/). No groundwater elevation data within the vicinity of the project were available.

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Table 2.2 Property Location Drainage Features

Property Location Typical Profile Soil Types

Arroyo Sequit Loam-gravelly loam:

clay

Kayiwish, gentle sloping: Colluvium and/or residuum weathered from andesite and metavolcanics

Circle X Ranch Loam-gravelly loam Cotharin-Talepop Association: Colluvium and/or residuum weathered from andesite

Dragon Property Channery loam to gravelly loam

Mipolomol-Topanga: Colluvium derived from sandstone and shale and/or residuum weathered from sandstone and shale and/or residuum weahtered from slate

Miller Property Gravelly loam to gravelly clay loam- channery loam to bedrock

Topanga-Mipolomol-Sapwi: Colluvium and/or residuum weathered from sandstone, shale and slate

Rocky Oaks Silty clay loam;

Linne silty clay loam: residuum weathered from shale

Morrison Ranch Loam-clay loam

Botella Loam: Alluvium derived from sandstone and shale

Paramount Ranch

Loam-gravelly loam

Cotharin-Talepop-Urban Land complex:

Colluvium and/or residuum weathered from andesite

Peter Strauss Ranch Clay

Kayiwish: Coluvium and/or residuum weathered from metavolcanics

2.2 PERMITS AND GOVERNING DOCUMENTS

In addition to the General Permit, the following documents have been taken into account while preparing this SWPPP

Regional Water Board requirements

Basin Plan requirements

Contract Documents

2.3 STORMWATER RUN-ON FROM OFFSITE AREAS

CGP, Attachment D, Section F requires dischargers to effectively manage run-on within the site.

Run-on from offsite shall be directed away from disturbed areas or shall collectively be in compliance with the effluent limitations in the CGP.

Based on the NOAA Atlas 14 Point Precipitation Frequency Estimates (http://hdsc.nws.noaa.gov/hdsc/pfds/pfds_map_cont.html), the anticipated Rainfall Intensity for the area (5year, 24-hour storm) ranges from 0.93 to 1.38 inches/hour, and the Run-off

Woolsey Fire Time Critical Removal Action 14 January 2020

Coefficient for the 8 locations ranged from 0.29 to 0.5. Estimated run-on to all parts of the project site can be calculated using the formula Q = CiA, where Q is the peak run-on rate in cubic feet per second, C is Area Run-off Coefficient, i is Rainfall Intensity in inches per hour, and A is discharge area in acres.

Run-on to the construction site during wet weather is anticipated based on surrounding topography. Sheet flow will enter the work areas as dispersed flow through mature vegetation.

Areas contributing run-on to the soil disturbance areas were estimated using a topographic map of the surrounding area. Supporting documentation for the run-on calculations in Table 2.3 is presented in Appendix A.

Erosion and sediment control BMPs in addition to permeable soils and some vegetation in the areas surrounding the project, are expected to help protect the site from potential run-on;

however, additional BMPs to control run-on are anticipated to be required for almost all of the 8 cleanup properties. Run-on controls will be necessary for the Circle X Ranch, the Dragon Property, the Miller Property the Peter Strauss Ranch, Paramount Ranch, and potentially for the Arroyo Sequit property, the Morrison Ranch, and the Rocky Oaks properties. Run-on from off-site areas shall be directed away from disturbed areas.

Table 2.3 Run-on Calculations

Q = CiA

Project Location C = Run-off Coefficient i =Rainfall Intensity (inches/hour)

A = Drainage Area (acres)

Q = Run-on Discharge ft3/sec

Arroyo Sequit 0.5 1.04 2.5 1.30 Circle X Ranch 0.35 1.16 95 38.57 Dragon Property 0.35 0.93 32.5 10.52 Miller Property 0.29 1.38 40.1 16.05

Rocky Oaks 0.4 0.99 0.3 0.12 Morrison Ranch 0.23 1.09 0.5 0.13

Paramount Ranch 0.35 1.1 0.3 0.12 Peter Strauss

Ranch 0.5 1.31 0.14 0.09

2.4 CONSTRUCTION SITE SEDIMENT AND RECEIVING WATER RISK

DETERMINATION

A construction site risk assessment has been performed for the project and the resultant risk level is Risk Level 2.

The risk level was determined using SMARTS. Soil erodibility factor (K) and LS values were determined by the .KMZ file overlain on the project locations on google earth. The R values were calculated using the EPA Erosivity calculator. The risk level is based on project duration, location, proximity to impaired receiving waters and soil conditions. Since there are 8 different project properties with varying K and LS values, the total predicted sediment loss was calculated

Woolsey Fire Time Critical Removal Action 15 January 2020 for each individual property and all 8 were averaged together. The total predicted sediment loss was calculated from the averaged values of R, K and LS. A copy of the Risk Level determination submitted on SMARTS with the PRDs is included in Appendix C.

Table 2.4 and Table 2.5 summarize the sediment and receiving water risk factors and document the sources of information used to derive the factors.

Table 2.4 Summary of Sediment Risk

RUSLE Factor

RUSLE K

Factor

RUSLE LS Factor RUSLE R Factor

Arroyo Sequit 0.15 10.16 36.33

Circle X Ranch 0.15 10.16 40.63

Dragon Property 0.37 10.95 32.36 Miller Property 0.37 9.79 38.15 Rocky Oaks 0.24 7.69 32.36 Morrison Ranch 0.15 8.07 32.36 Paramount Ranch 0.15 8.07 32.36 Peter Strauss Ranch 0.15 4.85 32.36 Average Total Predicted Sediment Loss (tons/acre) using the average of each factor for all 8 sites

66.40

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 poorly to well defined channels that flow into creeks or streams, and then out to the either Solstice Canyon in to the Frontal Santa Monica Bay, or Zuma and Arroyo Sequit Canyons to the Frontal Pacific Ocean, as detailed in Table 2.1

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Table 2.5 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)

Arroyo Sequit Yes No Yes No Yes No

Circle X Ranch Yes No Yes No Yes No

Dragon Property Yes No Yes No Yes No

Miller Property Yes No Yes No Yes No

Morrison Ranch Yes No Yes No Yes No

Paramount Ranch Yes No Yes No Yes No

Peter Strauss Ranch Yes No Yes No Yes No

Rocky Oaks 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

The project has a Medium Sediment Risk and High Receiving Water Risk and is thus Risk Level

2. Risk Level 2 sites are subject to both the narrative effluent limitations and numeric effluent standards. The narrative effluent limitations require stormwater discharges associated with construction activity to minimize or prevent pollutants in stormwater and authorized non-stormwater discharges through the use of controls, structures and best management practices.

Discharges from Risk Level 2 site are subject to NALs for pH and turbidity shown in Table 2.6.

This SWPPP has been prepared to address Risk Level 2 requirements (General Permit Attachment D).

2.5 CONSTRUCTION SCHEDULE

The site sediment risk was determined based on construction taking place between March 1, 2020 and December 30, 2020. Modification of the schedule (start and end dates) may affect risk

Table 2.6 Numeric Action Levels

Parameter Unit Numeric Action Level Daily Average pH pH units Lower NAL = 6.5 Upper NAL = 8.5

Turbidity NTU 250 NTU

Woolsey Fire Time Critical Removal Action 17 January 2020 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 F.

2.6 POTENTIAL CONSTRUCTION ACTIVITY AND POLLUTANT SOURCES

Appendix G includes a list of construction activities and associated materials that are anticipated to be used onsite. 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 Best Management Practices for the project. Location of anticipated pollutants and associated BMPs are show on the Site Map in Appendix B.

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) or Material Safety Data Sheets (MSDS), which are retained onsite at the construction trailer.

2.7 IDENTIFICATION OF NON-STORMWATER DISCHARGES

Non-stormwater discharges consist of discharges which do not originate from precipitation events. The General Permit provides allowances for specified non-stormwater discharges that do not cause erosion or carry other pollutants.

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

The General Permit (Attachment D, Section C) requires dischargers to identify and manage potential non-storm water discharges (where not otherwise required to be under a Regional Water Quality permit) and that discharges be eliminated, controlled, or treated. Management of potential non-storm water discharges that apply to the Project include:

Implementing measures to control non-storm water discharges during construction;

Applying water to disturbed soils to manage dust throughout the project alignment. Water used for dust control within the project shall consist of potable water. If non-potable water will be used for dust control, California Department of Health Services and Regional Water Quality Control Board requirements may apply. Water shall be applied to the project site using trucks equipped with spray systems, or hoses equipped with a positive means of shutoff. Water shall be applied daily or as often as necessary when disturbing dry soils to ensure effectiveness;

Washing vehicles (phytophthora removal) in such a manner as to prevent non-storm water discharges to surface waters or MS4 drainage systems; and

Cleaning streets in such a manner as to prevent unauthorized non-storm water discharges from reaching surface water or MS4 drainage systems. The Project is not located in an area with MS4 drainage systems.

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

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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.

2.8 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 and other requirements identified in Attachment B of the General Permit is located in Appendix B. Table 2.7 identifies Map or Sheet Nos. where required elements are illustrated.

Table 2.7 Required Map Information

Included on Map/Plan Sheet

No. (1) Required Element

S1 The project’s surrounding area (vicinity)

S2-S9 Property layout

S2-S9 Construction site boundaries

S2-S9 Drainage areas

S2-S9 Discharge locations

S2-S9 Sampling locations

S2-S9 Areas of soil disturbance (temporary or permanent)

S2-S9 Active areas of soil disturbance (cut or fill)

S2-S9 Locations of runoff BMPs

S2-S9 Locations of erosion control BMPs

S2-S9 Locations of sediment control BMPs

S2-S9 Locations of sensitive habitats, watercourses, or other features which are not to be disturbed

S2-S9 Locations of all post construction BMPs

S2-S9 Waste storage areas

S2-S9 Vehicle storage areas

S2-S9 Material storage areas

S2-S9 Entrance and Exits

S2-S9 Fueling Locations Notes: (1) Indicate maps or drawings that information is included on (e.g., Vicinity Map, Site Map, Drainage Plans, Grading Plans, Progress Maps, etc.)

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Section 3 Best Management Practices

3.1 SCHEDULE FOR BMP IMPLEMENTATION

Erosion Control and Sediment Control BMPs will be implemented prior to any work being performed. Construction entrances that prevent tracking offsite will be implemented in staging areas, if deemed necessary. Temporary BMPs shall be implemented in conformance with the following guidelines and in accordance with the BMP Fact Sheets provided in Appendix H. If there is a conflict between documents, the BMP Fact Sheets will prevail barring specific direction otherwise by the QSD or QSP. Site specific details in the Site Map prevail over standard details included in the Site Map. If a conflict between documents arises, consult the QSP or QSD.

Table 3.1 BMP Implementation Schedule

BMP Implementation Duration

E ro si on

C on tr ol

EC-1, Scheduling Prior to construction Entirety of project

EC-2, Preservation of Existing Vegetation

Start of construction Entirety of project

EC-7, Geotextiles and Mats As needed As needed

EC-15, Soil Preparation-Roughening Start of construction As needed

EC-16, Non-Vegetative Stabilization As specified herein Entirety of project

WE-1, Wind Erosion Control Start of construction Entirety of project

S ed im en t C on

SE-1, Silt fence As needed As needed

SE-4 Check Dams As needed As needed

SE-5, Fiber Rolls Start of construction Will remain, post-construction

SE-6, Gravel Bag Berms As needed As needed

SE-7, Street Sweeping As needed As needed

SE-10, Storm Drain Inlet Protection As needed As needed

TC-1, Stabilized Construction Entrance and Exit

As needed As needed

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Table 3.1 BMP Implementation Schedule

BMP Implementation Duration N on -S to rm w at er

NS-1, Water Conservation Practices Start of construction Entirety of project

NS-3, Paving and Grinding Operations As needed As needed

NS-6, Illicit Connection – Illegal Discharge

Start of construction Entirety of project

NS-9, Vehicle and Equipment Fueling Start of construction Entirety of project

NS-10, Vehicle and Equipment Maintenance

As needed As needed

WM-1, Material Delivery and Storage Start of construction Entirety of project

WM-2, Material Use As needed As needed

W as te M an ag em en t an d M at er ia ls

P lu ti on

C on

WM-3, Stockpile Management Start of construction Entirety of project

WM-4, Spill Prevention and Control Start of construction Entirety of project

WM-5, Solid Waste Management Start of construction Entirety of project

WM-6, Hazardous Waste Management

As needed As needed

WM-7, Contaminated Soil Management

As needed As needed

WM-8, Concrete Waste Management As needed As needed

WM-9, Sanitary-Septic Waste Management

Start of construction Entirety of project

WM-10, Liquid Waste Management As needed As needed

3.2 EROSION AND SEDIMENT CONTROL

Erosion and sediment controls are required by the General Permit 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.

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 run-off. Erosion control BMPs protect the soil surface by covering and/or binding soil particles.

Woolsey Fire Time Critical Removal Action 21 January 2020

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

1. Preserve existing vegetation whenever possible and to the greatest degree possible.

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 temporary erosion control BMP selection table indicates the BMPs that shall be implemented to control erosion on the construction site. Fact Sheets for temporary erosion control BMPs are provided in Appendix H.

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Table 3.2 Temporary Erosion Control BMPs

CASQA

Fact Sheet

BMP Name Meets a

Minimum Requirement(1)

BMP Used If not used, state reason

YES NO

EC-1 Scheduling X

EC-2

Preservation of Existing Vegetation

X

EC-3 Hydraulic Mulch (2) X Disturbed areas will be backfilled and compacted.

EC-4 Hydroseed (2) X Disturbed areas will be backfilled and compacted.

EC-5 Soil Binders (2) X Disturbed areas will be backfilled and compacted.

EC-6 Straw Mulch (2) X Disturbed areas will be backfilled and compacted.

EC-7 Geotextiles and Mats (2) X May be used on downgradient areas, if necessary.

EC-8 Wood Mulching (2) X Disturbed areas will be backfilled and compacted.

EC-9 Earth Dike and Drainage Swales (3) X Concentrated flows are neither anticipated nor desired.

EC-10 Velocity Dissipation Devices X Work is not anticipated at locations where this BMP would be needed.

EC-11 Slope Drains X Work will not be performed on large, steep slopes.

EC-12 Stream Bank Stabilization X There is no work in streambeds.

EC-14 Compost Blankets (2) X Disturbed areas will be backfilled and compacted.

EC-15 Soil Preparation-Roughening X Disturbed areas will be backfilled and compacted.

EC-16 Non-Vegetated Stabilization (2) X Disturbed areas will be backfilled and compacted.

WE-1 Wind Erosion Control X

Alternate BMPs Used: If used, state reason:

(1) Applicability to a specific project shall be determined by the QSD.

(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) Run-on from offsite shall be directed away from all disturbed areas as needed, diversion of offsite flows may require design/analysis by a licensed civil engineer and/or additional environmental permitting

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Scheduling

Construction activities shall be scheduled to avoid anticipated rain events whenever feasible.

Preservation of Existing Vegetation

Preserve existing vegetation in areas not subject to project-related disturbances. Vehicle access will be limited to existing roads/trails as much as possible. Destruction of existing vegetation is not anticipated since all areas are accessible by paved or dirt roads.

Geotextiles and Mats

Erosion control blankets may be placed on disturbed areas or stockpiles as temporary erosion control, if necessary.

Soil Preparation

Disturbed areas will be backfilled and compacted.

Non-Vegetated Stabilization

Disturbed areas will be backfilled and compacted. Rock stabilization is a BMP that may be used.

Wind Erosion Control

Construction and BMP material stockpiles will be covered to prevent wind erosion.

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 shall be implemented to control sediment on the construction site. Fact Sheets for temporary sediment control BMPs are provided in Appendix H.

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Table 3.3 Temporary Sediment Control BMPs

CASQA

Fact Sheet

BMP Name Meets a

Minimum Requirement(1)

BMP used If not used, state reason

YES NO

SE-1 Silt Fence (2) (3) X Silt fence will be used, if deemed necessary during the project.

SE-2 Sediment Basin X Project geometry and disturbance are such that this BMP is not practical or necessary.

SE-3 Sediment Trap X Project geometry and disturbance are such that this BMP is not practical or necessary.

SE-4 Check Dams X

SE-5 Fiber Rolls (2)(3) X

SE-6 Gravel Bag Berm (3) X

SE-7 Street Sweeping X Site trackout is anticipated to be very minimal. Trackout will be hand-swept, and use of a street sweeper will be used, if necessary.

SE-8 Sandbag Barrier X Gravel Bags are used in lieu of this BMP

SE-9 Straw Bale Barrier X

SE-10 Storm Drain Inlet Protection RL2&3 X If any storm drains are present, they will be protected

SE-11 ATS X An ATS is not anticipated to be needed for this project.

SE-12 Temporary Silt Dike X SE-1, SE-5, and other BMPs will be used.

SE-13 Compost Sock and Berm (3) X SE-1, SE-5, and other BMPs will be used.

SE-14 Biofilter Bags (3) X Other BMPs will be used in lieu of this BMP

TC-1

Stabilized Construction Entrance and Exit

X May be used if street sweeping is judged insufficient.

TC-2 Stabilized…