Lassen_SWPPP_Draft_122022.pdf

STORMWATER POLLUTION PROTECTION PLAN

for

Fire Clean-up Project, Lassen Volcanic Park

RISK LEVEL: Small Project Erosivity Waiver or LUP 1

Legally Responsible Person (LRP):

Anna Schrenk

BAER Implementation Coordinator for Lassen Volcanic NP 14412 Kennedy Memorial Drive, P.O. Box 188

Whiskeytown, CA 96095 530-242-3445 (Office) 530-440-6636 (Mobile) anna_schrenk@nps.gov

Submitted by (Contractor):

FedVet Construction

3513 Main Street, Suite 104B Chula Vista, CA 91911

619-271-5888 Hazard Assessment Award 140P8422P0

Project Address:

Lassen Volcano National Park (LAVO) NPS Lassen Volcanic Park Headquarters 38050 Highway 36 E, Mineral, CA 96061

SWPPP Prepared by:

GlobalASR Consulting Address

Stacy Sinclair, QSD #27535 310-892-1118

SWPPP Preparation Date

December 20, 2022

WDID: N/A

Estimated Project Dates:

Start of Construction: 06/01/2023 Completion of Construction: 10/31/2023

Table of Contents

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

Table 1.1 List of Changes to be Field Determined

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 Description

2.1 PROJECT AND SITE DESCRIPTION

2.1.1 Site Description

2.1.2 Existing Conditions

2.1.3 Existing Drainage

2.1.4 Geology and Groundwater

2.1.5 Project Description

2.1.6 Developed Condition

2.2 PERMITS AND GOVERNING DOCUMENTS

2.3 STORMWATER RUN-ON FROM OFFSITE AREAS

2.4 FINDINGS OF THE 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

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 Repair

4.1 BMP INSPECTION AND MAINTENANCE

Section 5 Training Section 6 Responsible Parties and Operators

6.1 RESPONSIBLE PARTIES

6.2 CONTRACTOR LIST

Section 7 Construction Site Monitoring Program/Monitoring and Reporting 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

7.6.2.3 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

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

7.7.3 Sampling and Analysis Plan for Non-Stormwater Discharges

7.7.4 Training of Sampling Personnel

7.7.5 Sample Collection and Handling

7.8 Active Treatment System Monitoring

7.9 Bioassessment Monitoring

7.10 Watershed Monitoring Option

7.11 Quality Assurance and Quality Control

7.11.5. Data Verification

7.12 Records Retention

CSMP Attachment 1: Weather Reports CSMP Attachment 2: Monitoring Records CSMP Attachment 3: Example Monitoring Forms CSMP Attachment 4: Field Meter Instructions CSMP Attachment 5: Supplemental Information Section 8 References Appendices Appendix A: Construction General Permit Appendix B: Site Maps

Appendix C: Permit Registration Documents Appendix D: SWPPP Amendment Certifications Appendix E: Risk Calculations Appendix F: Construction Schedule Appendix G: Construction Activities, Materials Used, and Associated Pollutants Appendix H: CASQA Stormwater BMP Handbook, Construction Fact Sheets Appendix I: Training and Certificates Appendix J: SDS Sheets Appendix K: Responsible Parties including Contractors and Subcontractors

Qualified SWPPP Developer

Approval and Certification of the Stormwater Pollution Prevention Plan

Project Name: Fire Clean-up Project

Project Location: Lassen Volcanic Park

“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 and Order 2012-0006- DWQ). I certify that I am a Qualified SWPPP Developer in good standing as of the date signed below.”

12/20/2022

QSD Signature

Stacy Sinclair, EdD, QSP/QSD

Date

27535 QSD Name

Environmental Specialist

QSD Certificate Number

310.892.1118 Title and Affiliation

Stacy.Sinclair@me.com

Telephone Number

Email

Legally Responsible Person

Approval and Certification of the Stormwater Pollution Prevention Plan

Project Location: Lassen Volcano Park

“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."

Anna Schrenk Legally Responsible Person

Signature of LRP or Approved Signatory

BAER Implementation Coordinator for Lassen Volcanic NP

Date

530-242-3445 (Office) 530-440-6636 (Mobile)

Name of Legally Responsible Person or Approved Signatory

Telephone Number

Amendment Log

Project Location: Lassen Volcano Park

Amendment No. Date

Brief Description of Amendment Include summary of changes, section and page number

Prepared and approved by

Name:

QSD#:

Name:

QSD#:

Name:

QSD#:

Name:

QSD#:

Name:

QSD#:

Name:

QSD#:

Name:

QSD#:

Name:

QSD#:

Section 1: SWPPP Requirements

1.1 INTRODUCTION

The Fire Clean-up Project consists of a Disaster Response Activity (demolition and clean-up) of fire ash and debris from the Dixie fire (July 2021) that damaged properties in the Lassen Volcanic National Park (LAVO), operated by the US National park Service.

The burn sites are in rural areas within Plumas and Lassen Counties. Most consist of boardwalks constructed of pressure treated wood in watershed or mashy areas, some accessible only by foot. The Drakesbad Water Treatment Plant, Kelley Cabin at Juniper Lake and Mt. Harkness Lookout and pit toilet were developed sites with structures. All sites together, not accounting for staging area, total 5,065ft2, less than one (1) acre disturbed soil area based on current estimates. Possible staging areas include the camping area across from NPS headquarters in Mineral, CA or Chester Airport.

Other areas damaged by fire were handled by the Environmental Protection Agency (EPA) in coordination with the Department of Toxic Substances (DTSC), leaving the Park Service areas for separate action. This SWPPP is based on information from the Phase I study, recognizing that Phase II has yet to begin. The project locations are generally shown below and in more detail in Appendix B:

Figure 1. General Area

Figure 2. Mt. Harkness Sites

Figure 3. Drakesbad Sites

Figure 4. Summit Lake and Grassy Swale Sites

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 in 2012 and 2014 (NPDES No. CAS000002) issued by the State Water Resources Control Board (State Water Board). The project is expected to meet the requirements of a small construction erosivity waiver based on acreage. However, this document is designed to provide guidance to support careful project implementation and will be amended if needed for compliance with the September 2022 permit reissuance.

This SWPPP has been prepared based on the SWPPP template provided on the California Stormwater Quality Association Stormwater Best Management Practice Handbook Portal:

Construction (CASQA, 2015). 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, identify all non-stormwater discharges and either eliminate, control, or treat them

• Identify site BMPs that should be 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

• Prepare a maintenance schedule for any BMPs installed during construction designed to reduce or eliminate pollutants after construction is completed (post-construction BMPs)

• Address any needed effluent monitoring and reporting for pH and turbidity

• For all construction activity, identify a sampling and analysis strategy and sampling schedule for discharges that have been discovered through visual monitoring to be potentially contaminated by pollutants not visually detectable in the runoff

• Establish project Risk Level

The NPDES General Permit requires assessment of the risk level of a site based on both sediment transport and receiving water risk during periods of soil exposure. Projects are enrolled into Risk Level 1, 2 or 3 designations depending on the risk level assessment. During the development of this SWPPP, the Project was determined it should qualify for the small construction project erosivity waiver. If the waiver is not awarded, this project would be a Risk Level 1 using the Revised Universal Soil Loss Equation (RUSLE) and therefore, this document was prepared based on Risk Level 1 requirements.

This SWPPP addresses the requirements for management of stormwater during mobilization, construction, cleanup, and site restoration for the Project and has been prepared in compliance with the terms of the NPDES General Permit.

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

5. Signed Certification Statement (LRP Certification is provided electronically with

SMARTS PRD submittal)

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 any Waste Discharge Identification (WDID) confirmation.

1.3 SWPPP AVAILABILITY AND IMPLEMENTATION

The discharger shall make this document available at the construction site during working hours while construction is occurring and shall be made available upon request by the Owner, a State or Municipal inspector. When the original document 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 shall be made available via a request by radio/telephone. (CGP Section XIV.C)

This Plan shall be implemented concurrently with the start of ground disturbing activities.

1.4 SWPPP AMENDMENTS

The SWPPP should be amended when:

• There is a General Permit violation.

• There is a reduction or increase in total disturbed acreage (General Permit Section

II Part C).

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

• Any condition of the Permit is violated or the general objective of reducing or eliminating pollutants in stormwater discharges has not been achieved. The SWPPP shall be amended and implemented within 14-calender days after notification from the local waterboard.

• 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 Owner or 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.

• When there is a change to the permit that requires amendment or recertification.

The following items shall be included in each amendment:

• Who requested the amendment

• The location of proposed change

• The reason for the 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 (template provided). The SWPPP text shall 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 or delegate 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 or delegate(1)

Check changes that can be field located or field determined by QSP or delegate

Increase quantity of an Erosion or Sediment Control Measure Yes

Relocate/Add stockpiles or stored materials Yes Relocate or add toilets Yes 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 of Erosion or Sediment Control Measure Yes

Changes to location of erosion or sediment control Yes

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 QSP or delegate must be approved by the QSD

1.5 RETENTION OF RECORDS

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

• All annual reports filed, including Storm Water Monitoring Information and Training Information

• All weekly BMP inspections and pre, during and post rain event inspections

• Rain gauge/weather readings from site inspections

• Quality assurance/quality control records and results

• Non-storm water discharge inspections, visual observation (inspections) and storm water discharge visual observation records

• Visual observation and sample collection exception records

• The records of any corrective actions and follow-up activities that resulted from analytical results, visual observation (inspections), or inspections

• Compliance Certifications

• Discharge reports

• Approved SWPPP document and amendments

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 General Permit discharge violation occurs, the QSP or designee shall immediately notify the QSD and LRP. The LRP shall 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 Water 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 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 Levels (NALs) exceedances are discussed in Section 7.

1.7 ANNUAL REPORT

The General Permit requires that permittees prepare, certify, and electronically submit an Annual Report in SMARTS no later than September 1st of each year if the project implementation takes longer than three (3) months. A draft report will be provided for review by August 1st, uploaded into SMARTS by August 20th for certification before the deadline.

Reporting requirements are identified in Section XVI of the General Permit. Annual reports will be filed in SMARTS by the LRP 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.

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 certification 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.

Section 2: Project Description

2.1 PROJECT AND SITE DESCRIPTION

2.1.1 Site Description

The Project is a variety of sites located within the Lassen Volcano National Park within Plumas and Lassen Counties, including Mt. Harkness, Juniper Lake, Drakesbad, Warner Valley area, Summit Lake and Grassy Swale. Staging areas under consideration include the camping area across from NPS headquarters in Mineral, CA or Chester Airport. These areas are identified on the vicinity and site maps in Appendix B.

Existing conditions relevant to this SWPPP are based on information provided in the Phase 1 report and subsequent conversations.

2.1.2 Existing Conditions

The following describes the general location and status of each of the sites related to this project. All sites have the potential for silica dust:

1. Mt. Harkness – approximate coordinates: 40.431189, -121.301612

a. Fire Lookout (578 ft2): The site is remote, consisting of stone base ruins (15’ x

15’), which has been boarded up to prevent access. Copper and lead were found above allowable thresholds.

b. Pit Toilet (68 ft2): The site is approximately 90 feet southeast of the lookout tower, near the summit of Mt. Harkness. Lead was found above allowable thresholds.

2. Juniper Lake - approximate coordinates: 40.462861, -121.311944

a. Kelley Cabin (2,000 ft2): The site is accessed by a dirt road in good condition with adjacent parking. The cabin is entirely burned and covered with a tarp. A wooded area with burned trees are in close proximity to the work area. Lead was found above allowable thresholds.

3. Drakesbad – approximate coordinates: 40.445209, -121.409165

a. Water Treatment Plant (150 ft2): The site is accessed by a road in good condition with adjacent parking. The area was wet with the ash in the burn footprint in the form of mud or sludge. A pipe to divert spring water was overflowing. Antimony, and lead were found above allowable thresholds.

b. Boardwalks (615 ft2): The site runs parallel to the road, approximately 1500 feet East of the Drakesbad Lodge. The East boardwalk is near the road. The West boardwalk is near the creek, before reaching the Hot Springs Creek Bridge.

Arsenic and copper were found above allowable thresholds.

4. Grassy Swale – approximate coordinates: 40.471526, -121.391191

a. Boardwalks (174 ft2): The site is reached about four (4) miles from Summit Lake, accessed by foot and consists of ash, likely from pressure treated wood. Arsenic and copper were found above allowable thresholds.

5. Hot Springs Creek – approximate coordinates: 40.442465, -121.400327.

a. Bridge (264 ft2): Located approximately 1500 feet East of the Drakesbad Lodge, at the Pacific Crest Trail where it crosses the Hot Springs Creek. A new bridge has been built. Boards from the original bridge have been removed to allow access to the ash material that remains above the banks of the creek. Copper was found above allowable thresholds.

6. Devil’s Kitchen (528 ft2): - approximate coordinates: 40.441442, -121.432645

a. Boardwalk: Located approximately 1200 feet west/southwest of the Drakesbad water treatment plant (3.a above). Pressure-treated wood fragments remain.

Copper was found above allowable thresholds.

b. Bridge: Located approximately 1.6 miles from the Drakesbad Devil’s Kitchen trailhead. Several planks and footing from the east end of the bridge burned.

Fragments of charcoal and ash remain. Copper was found above allowable thresholds.

7. Drake’s Lake Trail – approximate coordinates: 40.438169, -121.412184

a. Boardwalks 1-5 (386 ft2): Two of the boardwalk section connect the PCT with the meadow that leads to the Drakesbad Lodge. Other boardwalk sections are near the intersection leading to the devil’s Kitchen and a short distance to the south on the PCT. Pressure-treated wood fragments remain. Arsenic and copper were found above allowable thresholds.

8. Summit Lake – approximate coordinates: 40.494329, -121.422.445

a. Boardwalks (302 ft2): Accessible via paved road from Summit Lake camping area and has parking. Arsenic and copper were found above allowable thresholds.

9. Possible staging areas

a. Camping area across from NPS headquarters in Mineral, CA – approximate coordinates: 40.345491, -121.614455

b. Chester Airport - approximate coordinates: 40.291841, -121.241325

2.1.3 Existing Drainage

Site topography varies between sites. Though the sites are located at very different elevations, each site is relatively flat with little change in elevation. Some sites, like those on Mt. Harkness, are at the top of a peak with steep slopes surrounding. Other sites, like the boardwalks are in valleys, crossing creek beds.

Surface drainage from project sites would likely flow into streams and through the Mill Creek or North Fork Feather River Watersheds. Surface water from the project may eventually discharge to the Pit River, a 303(d) listed body of water impaired by nutrients, organic enrichment / low dissolved oxygen, and water temperature through tributary streams formed by snowmelt. As such, the project has an indirect potential impact to the Pit River.

2.1.4 Geology and Groundwater

Lassen Peak is the southernmost active volcano in the Cascade Range. Before the 1980 eruption of Mount St. Helens in Washington, Lassen Peak was the most recent volcanic outburst in the contiguous 48 states. Lassen Peak erupted explosively on 22 May 1915. Pyroclastic flows, debris avalanches, debris flows, and associated flood waters devastated nearby areas, and volcanic ash fell across hundreds of miles to the east.

Lassen Peak is part of the Cascade volcanic arc, which extends from southern British Columbia to northern California. The volcanic arc is a result of oblique subduction of the Juan de Fuca plate (including the Explorer and Gorda subplates). Landward from the plunging tectonic plates, magma has worked its way to the surface and built a series of conspicuous volcanic landscapes, ranging in age from Miocene to Holocene in age. Subduction, and the resulting volcanoes and earthquakes, inspired the collective name “Ring of Fire” for the circle of volcanoes that surround the Pacific Ocean. Lassen Peak makes up a segment of this ring.

Although Lassen is noted primarily for its volcanic terrain and associated hydrothermal features, volcanism and glaciation have worked together in creation of the park’s landscape.

Glacial landforms such as moraines and outwash deposits “overprint” much of the volcanic foundation. The alteration of volcanic rocks by hydrothermal processes facilitated glacial erosion, and glacially eroded features such as U-shaped valleys, cirques, and arêtes occur throughout the park.

Glaciers advanced at least five times during the ice ages of the Pleistocene Epoch. The main effects of Pleistocene glaciation were erosional, deepening major valleys, removing bedrock from large parts of the landscape, and creating or enlarging lake basins. Glaciers polished and scratched striations and grooves on bedrock surfaces, and formed cirques and arêtes at high elevations, and roches moutonnées in valleys. Glacial deposition helped to shape the Lassen landscape. They widely distributed till (a mixture of clay, silt, sand, gravel, and boulders), developed moraines, and deposited erratics. Glacial meltwater deposited outwash (sand and gravel) beyond the margins of glacial ice.

Groundwater The park is comprised of four watersheds: Pit River, Battle Creek, Mill Creek, and North Fork Feather River. Lassen Volcanic is part of the Sierra Nevada region, which plays a critical role in California’s water system. More than 60 percent of California’s developed water supply originates in this region. The region's forests and meadows play important roles in ensuring water quality and reliability.

Of the sites that specifically relate to this Project, groundwater remains at least 20 feet below the surface. The groundwater gradient should be to the south. Work is not expected to excavate more than one (1) foot and should not be in contact with groundwater.

2.1.5 Project Description

The scope of this project consists of the removal of post-fire debris and affected groundcover as described by the Debris Removal Operations Plan (DROP).

2.1.6 Developed Condition

After the demolition phase, the area will be ready to be rebuilt (as a different phase of the project) or covered in mulch and reopened as naturalized land for park visitors. Demolition phase surface drainage will mimic the pre-developed condition. If non-hazardous, site run-off will be filtered through BMPs before conveyance. If in contact with hazardous materials, run-off will be tested and removed for proper disposal if required.

Table 2.1 Construction Site Estimates

Construction site area <1 Acre

Percent impervious before construction <1 Acre / 1%

Run-off coefficient before construction 0.08%

Percent impervious after Demolition/Removal <1 Acre / 0.5%

Run-off coefficient after construction 0.06%

2.2 PERMITS AND GOVERNING DOCUMENTS

In addition to the General Permit, the following documents have been taken into account in preparation of this SWPPP:

• Regional Water Board Requirements

• Basin Plan Requirements

• Debris Removal Operations Plan (DROP)

2.3 STORMWATER RUN-ON FROM OFFSITE AREAS

There is no anticipated off-site run-on to Mt. Harkness or the water treatment plant sites because these sites are located at the top of a crest. Boardwalks may have off-site run-on based on local topography. Possible staging areas will be analyzed and added to this SWPPP when finalized.

Perimeter BMPs will be installed to prevent stormwater run-on and/or run-off from sites as appropriate to the site conditions.

2.4 FINDINGS OF THE CONSTRUCTION SITE SEDIMENT AND RECEIVING WATER RISK DETERMINATION

In accordance with the State Water Resources Board Construction General Permit (see Appendix K: Construction General Permit), this project is considered a Linear Underground/Overhead Project (LUP). Based in this classification, a construction site risk assessment has been performed for the project and the resultant risk level is LUP Type 1.

The LUP risk level was determined using the State of California Water Resources Board “Sediment Risk Factor Worksheet”. The risk level is based on project location, topography, proximity to impaired receiving waters and soil conditions. A copy of the Risk Level calculations are included in Appendix E. The risk level was also calculated by determining the risk of receiving waters. Documents that support this parameter are also included in Appendix C.

Table 2.2 and Table 2.3 summarize the sediment and receiving water risk factors and document the sources of information used to derive the factors. The Revised Universal Soil Loss Equation (RUSLE) was used to determine the risk factors.

Table 2.2 Summary of Sediment Risk

Location Approximate Coordinates

Estimated Area (ft2)

% of Project

R K LS A

Mt. Harkness Fire lookout and pit toilet

40.431189, - 121.301612

646 12.75 10.95 0.0023 0.05 0.016

Kelley Cabin Juniper Lake

40.462861, - 121.311944

2000 39.49 10.7 0.0023 0.05 0.001

Drakesbad 40.445209, - 121.409165

765 15.1 14.13 0.0023 0.05 0.002

Grassy Swale 40.471526, - 121.391191

174 3.43 10.5 0.0023 0.05 0.001

Hot Springs Creek 40.442465, - 121.400327

264 5.21 12.63 0.0023 0.05 0.001

Devil’s Kitchen 40.441442, - 121.432645

528 10.42 15.3 0.0023 0.05 0.001

Drake’s Lake 40.438169, - 121.412184

386 7.62 14.13 0.0023 0.05 0.002

Summit Lake 40.494329, - 121.422.445

302 5.96 11.16 0.0023 0.05 0.001

5,065 100%* 12.44

RUSLE

Factor Value Method for establishing value

R Weighted 12.44

EPA Online Erosivity Calculator

K 0.0023 State Water Resources Control Board Program Risk Assessment Map references

LS 0.05 State Water Resources Control Board Program Risk Assessment Map references

Total Predicted Sediment Loss (tons/acre) 0.00143 Tons/acre

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

Q Low

£ Medium

£ High

Run-off from the project site discharges indirectly into the Pit River.

Table 2.3 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)

£ Yes Q No £ Yes Q No £ Yes Q No

Overall Receiving Water Risk Q Low

£ High

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

This project, having a Low Sediment Risk and a Low Receiving Water Risk, should receive a small construction erosivity waiver. Otherwise, it would align with LUP Type 1.

LUP Type 1 sites are subject to the narrative effluent limitations specified in the General Permit.

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, structures, and best management practices. This SWPPP has been prepared to address Risk Level 1 requirements (General Permit Attachment A).

2.5 CONSTRUCTION SCHEDULE

The site sediment risk was determined based on construction taking place between June 1, 2023 and October 31, 2023. Modification or extension of the schedule (start and end dates) may affect risk determination and permit requirements.

The Contractor 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

This is a cleanup operation involving the removal of ash and debris. The ash (and some ash/soil) has been characterized as hazardous waste. Activities will require the following:

• Personal protective equipment (PPE)

• Plastic or other materials to cover the ground

• barriers to prevent run-off

• sprayers or misters to clean equipment or for control dust

• Shovels, wheelbarrows, bags, tape and other consumables to gather materials to be removed from the site

• Accessing sites may involve trucks and/or ATVs.

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 listed in Section 3 were used 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, refer to Section 7.

For a full and complete list of on-site pollutants, refer to the Safety Data Sheets (SDS), which are retained on-site.

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 following is a list of potential non-stormwater discharge that may occur during the course of the project:

• Discharges associated with illegal dumping/discharging by others not associated with the project

• Demolition discharges

• Fueling discharges

• Dust control discharges

• Vehicle and equipment

• Wash water from cleaning equipment

• Sanitary and septic wastes

• Chemical leaks and/or spills of any kind

Discharges of construction materials and wastes, such as fuel, resulting from dumping, spill, or direct contact with rainwater or stormwater run-off, are also prohibited.

These non-stormwater discharges will be managed with the stormwater and non-stormwater BMPs described in Section 3 of this SWPPP and will be minimized by the QSP. Situations will be eliminated, controlled, disposed, or treated on-site.

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

• Irrigation of vegetative erosion control measures

• Sprayers / misters used to clean equipment or control dust

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

2.8 REQUIRED SITE MAP INFORMATION

The construction project’s Site Map(s) showing the project locations, 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

2.5 identifies required elements included.

Table 2.5 Required Map Information

Included on Map(1) Required Element

P The project’s surrounding area (vicinity) P Site layout P Construction site boundaries

Drainage areas

Discharge locations

Sampling locations

P Areas of soil disturbance (temporary or permanent)

P Active areas of soil disturbance (cut or fill) P Locations of run-off BMPs P Locations of erosion control BMPs P Locations of sediment control BMPs n/a ATS location (if applicable)

P Locations of sensitive habitats, watercourses, or other features which are not to be disturbed n/a Locations of all post construction BMPs

P Waste storage areas n/a Vehicle storage areas

P Material storage areas P Entrance and Exits n/a 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.)

Section 3: Best Management Practices

3.1 SCHEDULE FOR BMP IMPLEMENTATION

Implementation of project BMPs is the first order of business each day. Replacement BMP products shall be on hand to ensure no laps in BMP installation. Products no longer needed shall be removed and/or disposed of properly.

Sufficient personnel, materials and adequate equipment shall be available to perform BMP maintenance work immediately and to work continuously until its completion.

The use of plastics and other material that could negatively impact the environment in the selection of BMPs will be minimized where feasible. SDS and fact sheets for all materials shall be approved prior to BMP use on site.

Work is only happening after snow has melted and before new snow falls.

Table 3.1 BMP Implementation Schedule

Category BMP Implementation Duration

Temporary Erosion Control

EC-1 Scheduling Prior to construction On-going

EC-2 Preservation of Existing Vegetation Prior to construction On-going

EC-3 Hydraulic Mulch No n/a

EC-4 Hydroseeding No n/a

EC-5 Soil Binders No n/a

EC-6 Straw Mulch No n/a

EC-7 Geotextile & Mats No n/a

EC-8 Wood Mulching No n/a

EC-9 Earth Dikes and Drainage Swales No n/a

EC-10 Velocity Dissipation Devices No n/a

EC-11 Slope Drains No n/a

EC-12 Streambank Stabilization If needed If needed

EC-14 Compost Blankets If needed If needed

EC-15 Soil Preparation / Roughening No n/a

EC-16 Non-vegetative Stabilization If needed If needed

Temporary Sediment Control

SE-1 Silt Fence If needed If needed

SE-2 Sediment Basin No n/a

SE-3 Sediment Trap No n/a

SE-4 Check Dam If needed If needed

SE-5 Fiber Rolls If needed If needed

Category BMP Implementation Duration

SE-6 Gravel Bag Berm If needed If needed

SE-7 Street Sweeping and Vacuuming If needed If needed

SE-8 Sandbag Barrier If needed If needed

SE-9 Straw Bale Barrier If needed If needed

SE-10 Storm Drain Inlet Protection If needed If needed

SE-11 Active Treatment System No n/a

SE-12 Manufactured Linear Sediment Controls

If needed If needed

SE-13 Compost Socks and Berms If needed If needed

SE-14 Biofilter Bags If needed If needed

Wind Erosion Control WE-1 Wind Erosion Control If needed If needed

Temporary Tracking Controls

TC-1 Stabilized construction Entrance / Exit If needed If needed

TC-2 Stabilized Construction Roadway If needed If needed

TC-3 Entrance/Outlet Tire Wash No n/a

Non-stormwater

Management

NS-1 Water Conservation Practices If needed If needed

NS-2 Dewatering Operations No n/a

NS-3 Paving and Grinding Operations No n/a

NS-4 Temporary Stream Crossing No n/a

NS-5 Clear Water Diversion If needed If needed

NS-6 Illicit Connection / Discharge If needed If needed

NS-7 Potable Water / Irrigation If needed If needed

NS-8 Vehicle and Equipment Cleaning If needed If needed

NS-9 Vehicle and Equipment Fueling If needed If needed

NS-10 Vehicle and Equipment Maintenance If needed If needed

NS-11 Pile Driving Operations No n/a

NS-12 Concrete Curing No n/a

N-13 Concrete Finishing No n/a

NS-14 Material Over Water If needed If needed

NS-15 Demolition Adjacent to Water If needed If needed

NS-16 Temporary Batch Plants No n/a

WM-1 Material Delivery and Storage If needed If needed

Category BMP Implementation Duration

Waste Management and Materials Pollution Control

WM-2 Material Use If needed If needed

WM-3 Stockpile Management If needed If needed

WM-4 Spill Prevention and Control If needed If needed

WM-5 Solid Waste Management If needed If needed

WM-6 Hazardous Waste Management If needed If needed

WM-7 Contaminated oil Management If needed If needed

WM-8 Concrete Waste Management If needed If needed

WM-9 Sanitary/Septic Waste Management If needed If needed

WM-10 Liquid Waste Management If needed If 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 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 temporary erosion control BMP selection table indicates the BMPs that shall be implemented to control erosion on the construction site. Implementation of these BMPs is the first order of business for the day. Waste disposal is the checked for secured storage at the end of each day. Fact Sheets for temporary erosion control BMPs are provided in Appendix H.

Table 3.2 Temporary Erosion Control BMPs

CASQA

Fact Sheet

BMP Name Meets a Minimum Requirement(1)

BMP

Used

BMP Not Used

Reason not used

EC-1 Scheduling P P

EC-2 Preservation of Existing Vegetation P P

EC-3 Hydraulic Mulch P (2) P Should not be needed for planned work

EC-4 Hydroseed P (2) P Should not be needed for planned work

EC-5 Soil Binders P (2) P Should not be needed for planned work

EC-6 Straw Mulch P (2) P Should not be needed for planned work

EC-7 Geotextiles and Mats P (2) P Should not be needed for planned work

EC-8 Wood Mulching P (2) P Should not be needed for planned work

EC-9 Earth Dike and Drainage swales P (3) P Should not be needed for planned work

EC-10 Velocity Dissipation Devices P Should not be needed for planned work

EC-11 Slope Drains P Should not be needed for planned work

EC-12 Stream Bank Stabilization P

EC-14 Compost Blankets P (2) P

EC-15 Soil Preparation – Roughening P Should not be needed for planned work

EC-16 Non-Vegetated Stabilization P (2) P

WE-1 Wind Erosion Control P

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, diversion of offsite flows may require design/analysis by a licensed civil engineer and/or additional environmental permitting

The following narrative descriptions highlight pertinent BMP components. The full standard (as detailed by the CASQA BMP Fact Sheets) should be followed for each BMP selected. These temporary erosion control BMPs shall be implemented in conformance with the following guidelines and as outlined in the BMP Factsheets provided in Appendix H. 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.

EC-1 Scheduling: The project schedule will show how BMP implementation relates to soil disturbing and re-stabilization practices. Non-active areas will be stabilized as soon as practical after the cessation of soil disturbing activities or one day prior to the onset of precipitation, whichever occurs first. The weather forecast will be monitored for rain and snowfall. When rainfall is predicted, the schedule should be adjusted to allow for the implementation of stabilizations and sediment controls on any disturbed areas prior to the onset of rain.

EC-2 Preservation of Existing Vegetation: Existing vegetation will be preserved as much as possible, with a focus on vegetation along steep slopes, near water, and sites in wooded areas.

EC-12 Streambank Stabilization: Stream channels, streambanks, and associated riparian areas are dynamic and sensitive ecosystems that respond to changes in land use activity. Streambank and channel disturbance resulting from demo activities can increase the stream’s sediment load, which can cause channel erosion or sedimentation and have adverse affects on the biotic system. BMPs can reduce the discharge of sediment and other pollutants to minimize the impact of construction activities on watercourses.

EC-14 Compost Blanket: A compost blanket, if properly installed, can be very successful at vegetation establishment, weed suppression and erosion control. A compost blanket is applied to slopes and earth disturbed areas to prevent erosion, and in some cases, increase infiltration and/or establish vegetation. It protects the soil surface from raindrop erosion, particularly rills and gullies that may form under other methods of erosion control. If needed, it would be used with the careful oversight of the Park staff.

EC-16 Non- Vegetative Stabilization:, Non-vegetated stabilization methods are suitable for use on disturbed soil areas and on material stockpiles that need to be temporarily or permanently protected from erosion by water and wind. Non-vegetated stabilization should only be utilized when vegetation cannot be established in the required timeframe, due to soil or climactic conditions, or where vegetation may be a potential fire hazard. 3” Crushed Miscellaneous Base will be applied to all inactive disturbed areas. An inactive disturbed area is defined as an area that has been disturbed, is not yet stabilized, and work is not scheduled to resume at the area within 14 days. BMPs will be re-applied needed to maintain effectiveness.

WE-1 Wind Erosion Control: Water will be applied to disturbed areas and stockpiles as necessary to prevent or alleviate erosion by force of wind.

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. Implementation of these BMPs is the first order of business for the day. Waste disposal is the checked for secured storage at the end of each day. Fact Sheets for temporary sediment control BMPs are provided in Appendix H.

Table 3.3 Temporary Sediment Control BMPs

CASQA

Fact Sheet

BMP Name Meets a Minimum Requirement(1)

BMP

Used

BMP Not Used

Reason not used

SE-1 Silt Fence P (2)(3) P

SE-2 Sediment Basin P Should not be required based on scope of work.

SE-3 Sediment Trap P Should not be required based on scope of work.

SE-4 Check Dams P

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

SE-6 Gravel Bag Berm P (3) P

SE-7 Street Sweeping P P

SE-8 Sandbag Barrier P P

SE-9 Straw Bale Barrier P P

SE-10 Storm Drain Inlet Protection P P

SE-11 ATS P P Should not be required based on scope of work.

SE-12 Manufactured Linear Sediment Controls P P

SE-13 Compost Sock and Berm P P

SE-14 Biofilter Bags P (3) P Should not be required based on scope of work.

TC-1 Stabilized Construction Entrance and Exit

P P

TC-2 Stabilized Construction Roadway P

TC-3 Entrance Outlet Tire Wash P Should not be required based on scope of work.

(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, diversion of offsite flows may require design/analysis by a licensed civil engineer and/or additional environmental permitting

The following narrative description highlight pertinent BMP components. These temporary sediment control 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 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.

SE-1 Silt Fence: Linear sediment controls such as silt fencing, fiber rolls, gravel bag berms, etc.

will be used as a perimeter control to contain sediment within the project area and to keep sediment and construction materials out of crossing/adjacent water bodies (including ditches, swales, etc.). Great care will be taken to keep sediment and materials out of the channel.

SE-4 Check Dams: Small barriers constructed of rock, gravel, fiber rolls or other products may be used across a swale or drainage ditch to reduce the effective slope of a channel, reducing scour and channel erosion, reducing flow velocity and increasing residence time to allow sediment to settle.

SE-5 Fiber Rolls: Fiber rolls will be deployed on disturbed slopes or as linear sediment controls in conjunction with silt fencing,…