Angora_SWPPP_Final_20May15_signed.pdf

Waste Discharge Identification Number (WDID): TBD

STORM WATER POLLUTION PREVENTION PLAN

for

The Angora Creek Stream Restoration Project

USDA FOREST SERVICE, LAKE TAHOE BASIN MANAGEMENT UNIT

(LTBMU)

Legally Responsible Person (LRP)

Jeff Marsolais, Forest Supervisor

Lake Tahoe Basin Management Unit

530-543-2600

Approved Signatories

Theresa Cody, PH/QSD

LTBMU

Reviewed and Concurred:

Office: 530-543-2788 Cell: 530-545-2057

Theresa Cody, QSD

Date

Prepared by: Susan Norman, Hydrologist

SWPPP Date: March 12, 2015 i

Contents I. Introduction and Certifications

A. SWPPP Objectives

B. Permit Registration Documents

C. Certification and Training Requirements

Qualified SWPPP Developer and Practitioner

Legally Responsible Person

D. Contractor List

E. Emergency contact person and 24-hour phone number

F. SWPPP Availability and Public Records Access

G. Required Changes

II. Project Information

A. Project Description, site address and driving directions

B. Estimated Phasing and Implementation Schedule

C. WDID

D. Potential Construction Site Pollutants of Concern and Sources

E. Site Location Maps

III. Best Management Practices

A. Site Management

B. Sediment and Erosion Control

Erosion Control

Sediment Control

C. Non-Storm water and Material Management

D. Dewatering and Diversions Plan

E. Post-Construction Storm water Management Measures

F. Schedule for BMP Implementation

G. BMP and Disturbed Soil Area maps

IV. BMP Inspection, Maintenance and Rain Event Action Plans

A. BMP Inspection and Maintenance

B. Rain Event Action Plan

V. Construction Site Monitoring and Reporting Plan (CSMRP) ii

A. Purpose

B. Weather and Rain Event Tracking

C. Visual Monitoring

D. River Diversion and New Channel Flow Initiation Monitoring

E. Summary of Construction Monitoring

F. Watershed Monitoring Option

G. Quality Assurance and Quality Control

H. Reporting Requirements and Records Retention

Weekly Reporting during active construction

Record Keeping

I. Non-Compliance Reporting

24-Hour Reporting

Planned Changes

Anticipated Noncompliance

J. Annual Report

K. Final Report

VI. Appendices

Appendix A. SWPPP Amendment Forms

Appendix B. CASQA BMP Standard Specifications

Appendix C. Site Maps

Figure 1. Angora Channel Restoration

Figure 2. Seneca Pond Restoration

Appendix D. Construction Plans – Angora Creek Restoration Project

Appendix E. Visual Monitoring/BMP Inspection Forms

Appendix F. Rain Event Action Plan Template

Appendix G. Estimated Construction Schedule

Appendix H. Angora Creek Restoration Effectiveness Monitoring Plan

Appendix I. Permit Registration Documents

Appendix J. Training Logs

Appendix K. Water Quality Sampling and Analysis Plan

Appendix L. QSD/QSP Certification iii

I. Introduction and Certifications

A. SWPPP Objectives

This Storm Water Pollution Prevention Plan (SWPPP) has been developed for the Angora Creek

Stream Restoration Project to comply with the requirements of the Clean Water Act to implement Best Management Practices (BMPs) to achieve compliance with effluent limits and receiving water objectives as directed by the Construction General Permit for the Lake Tahoe

Hydrologic Unit (Board Order R6T-2011-0019, NPDES No. CAG616002). This SWPPP has been developed and will be amended, when necessary, to meet the following objectives:

1. Identify pollutant sources including sediment sources that may affect the quality of storm water discharges associated with construction activity.

2. Identify non-storm water discharges.

3. Identify, construct, implement and maintain BMPs to reduce or eliminate pollutants in storm water discharges and authorized non-storm water discharges from the construction site.

4. Identify all effluent discharge outfall locations, sampling and analysis strategy and protocols, and a sampling schedule for discharges from the identified outfalls from the project area.

B. Permit Registration Documents

Required Permit Registration Documents (PRD) 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:

Notice of Intent (NOI);

401;

Site Maps;

Annual Fee;

Signed Certification Statement (LRP Certification is provided electronically with SMARTS

PRD submittal); and

SWPPP.

Site Maps are located within Appendix C of this document. A copy of all other submitted PRDs shall be kept in Appendix I along with the Waste Discharge Identification (WDID) confirmation.

C. Certification and Training Requirements

Qualified SWPPP Developer and Practitioner

The SWPPP for this project was developed by Theresa Cody, PH a Qualified SWPPP Developer (QSD). The QSD shall certify and amend the SWPPP. Theresa Cody is the appointed QSD for this Project and meets the certification requirement of Section VIl.B.1 of the Construction General Permit based on:

Professional Hydrologist, American Institute of Hydrology, Certification #12-H-4011

Qualified SWPPP Developer (QSD) Registration #23615

The QSD has received the following training:

California Construction General Permit Training, June 2011

Theresa’s QSD/QSP Certificate is in Appendix L. Throughout this document Theresa Cody will be referred to as the QSD.

Project Name: Upper Truckee River Reach 5 Restoration and Utility Relocation Project

“The Storm Water Pollution Prevention Plan and Appendices were prepared under my direction to meet the requirements of the Construction General Permit for Storm Water discharge in the Lake Tahoe Hydrologic Unit (Board Order No R6T-2001-0119). I certify that I am a Qualified SWPPP Developer in good standing as of the date signed below.”

j4JLL C\ / QSD Signature Date

The QSP shall have primary responsibility and significant authority for the implementation, maintenance and inspection/monitoring of the SWPPP requirements. The QSP will be available at all times throughout the duration of the project.

Duties of the QSP include but are not limited to:

• Ensuring full compliance with the SWPPP and the Construction General Permit.

• Implementing all elements of the SWPPP, including but not limited to:

o Ensuring all BMPs are implemented, inspected and properly maintained;

o Preparing pre-storm, during storm, and post-storm BMP inspection reports;

o Preparing weekly turbidity monitoring summary reports based on continuous turbidity monitoring and relevant grab sample monitoring data collected during active construction periods;

o Performing routine inspections and observations;

o Performing non‐storm water visual observations and inspections;

o Performing non‐storm water sampling and analysis, as required;

o Implementing non‐storm water management, and materials and waste management activities such as: monitoring discharges; general site clean‐up;

vehicle and equipment cleaning, fueling and maintenance; spill control; ensuring that no materials other than storm water are discharged in quantities which will have an adverse effect on receiving waters;

o Conducting pre‐storm inspections for qualifying storm events;

o Conducting daily inspections during qualifying storm events;

o Conducting post‐storm inspections for qualifying storm events;

o Monitoring weather forecasts for both likely precipitation events and qualifying rain events;

o Preparing and implementing Rain Event Action Plans for likely precipitation events;

o Submitting numeric effluent limitations (NELs) exceedance data, including storm water effluent limits and receiving water limits and reports to the QSD and Approved Signatory. Following receipt of the QSD’s and/or Approved Signatory’s approval, QSP shall upload the NEL exceedance data or report to the SWRCB’s SMARTS database;

o Ensuring elimination of all unauthorized discharges;

o Mobilizing crews in order to make immediate repairs to the control measures as needed;

o Notifying the LRP or Authorized Signatory immediately of off‐site discharges or other non‐compliance events;

o Submitting Notices of Discharge and reports of Illicit Connections or Illegal

Discharges; and o Preparing Annual Reports each year summarizing corrective actions, sampling and analyses, and any corrective actions not implemented.

The QSP may delegate the inspections and activities to an appropriately trained employee, but shall ensure adequate deployment.

Before construction operations commence under each phase the QSP will conduct an on‐site training with project personnel to review the SWPPP, construction operations and necessary

BMPs. Additionally, periodic trainings will be held on specific tasks as the project progresses and tasks change. Training logs (Appendix J) will be filled out for each training season and kept with the SWPPP. LRWQCB staff will be given advance notice of trainings when possible and have the opportunity to attend.

Legally Responsible Person

Approval and Certification of the Storm Water Pollution Prevention Plan

Project Name: Angora Creek Stream Restoration Project

“I certify that this document and all Appendices were prepared under my direction in accordance with a system designed to ensure that qualified personnel properly gathered and evaluated 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.”

Jeff Marsolais Lake Tahoe Basin Management Unit

Legally Responsible Person Organization

LRP Signature Date

Forest Supervisor 530-543-2600

Title Telephone Number

D Contractor List Matt Weld of Waterways Consulting was the primary Design Engineer for the Angora Creek Stream Restoration Project. Throughout this document Matt Weld will be referred to as the Design Engineer. Waterways Consulting is no longer under contract for this project, and any design modifications will be conducted directly by USFS staff and approved by the Forest Engineer.

The USDA Forest Service will be acting as the Prime Contractor for all work under the Angora Creek Stream Restoration effort, hereinafter referred to as the Project, with the exception of the installation, maintenance, and de-installation of a clear water diversion for both Angora channel flow and groundwater within the active construction area. The contract(s) to provide equipment and purchase materials for the Project will be awarded closer to the date of implementation. A list of awarded Contractors and Subcontractors who will be working on the

Project will be added to the SWPPP once the contracts have been awarded.

E. Emergency contact person and 24-hour phone number

Owner and UTR Channel Restoration Prime Contractor:

US Forest Service LTBMU

35 College Drive

South Lake Tahoe, CA 96150

530-543-2600

Project Manager: Craig Oehrli, Hydrologist

LTBMU

Office: 530-543-2681

Cell: 530-307-1668 (24-hour)

Assistant Project Manager:

Stephanie Heller, Hydrologist

LTBMU

Office: 530-543-2838

Cell: 530-307-0157

24-Hour (alternate):

Sue Norman, Physical Sciences Group Leader

LTBMU

Office: 530-543-2662

Cell: 530-400-9888

Hazardous Spill: Genevieve Villemaire

Forest Spill Coordinator, LTBMU

530-543-2783

24-Hour contact Camino Dispatch 642-5170

F. SWPPP Availability and Public Records Access

A copy of the SWPPP will be kept on the project site at all times. Additionally, the SWPPP will be available to view in the SMARTS database.

G. Required Changes

The SWPPP shall be maintained such that it reflects the actual site conditions for the duration of the project. This will require the QSD to amend the SWPPP whenever a qualifying change is made. The SWPPP shall be revised when:

There is a change in construction or operations which may affect the discharge of pollutants to surface waters or ground waters as determined using the criteria outlined in the “Planned Changes” Section of this document;

There is an increase in the disturbed acreage;

BMPs do not meet the objectives of reducing or eliminating pollutants in storm water discharges;

There is a General Permit violation. If the LRWQCB determines that a Permit violation has occurred, the SWPPP shall be amended and implemented within 72 hours of notification, or as soon as additional materials can be obtained, if needed;

and

When deemed necessary by the QSD, Design Engineer or Project Manager.

The following items shall be included in each amendment:

Who requested the amendment;

The description and location of proposed change;

The reason for change;

The original BMP proposed, if applicable; and

The new BMP proposed, if applicable.

Approved amendments shall be uploaded into the SMARTS database and inserted into the appropriate section of the SWPPP or Appendix and a SWPPP Amendment Certification shall be kept with the SWPPP. The SWPPP text shall be revised, replaced, and/or hand annotated as necessary to properly convey the amendment. Additionally, the LRWQCB staff will be notified by email of all SWPPP Amendments once uploaded into SMARTS.

A blank copy of the SWPPP Amendment Certification and Approval form is located in Appendix

A. A SWPPP Amendment log will be kept on-site with the SWPPP during construction operations. The SWPPP Amendment log form can be found in Appendix A.

Table 1 displays the changes that have been designated by the QSD as “to be field determined” and constitute minor changes that the QSP may implement based on field conditions. The QSP shall document these changes in the SWPPP Amendment log and document the reason they don’t need QSD approval.

Table 1. List of Changes to be Field Determined

Candidate changes for field location or determination by QSD1

Changes that can be field located or field determined by QSP

Increase quantity of an Erosion or Sediment Control Measure

Reduce disturbed acreage Relocate or add stockpiles or stored materials within mapped area

Locate or add portable toilets

Relocate vehicle storage and/or fueling locations within mapped area

Relocate areas for waste storage

Locate water drafting areas

Minor changes to schedule or phases 1Any field changes not identified for field location or field determination by QSP must be approved by QSD.

II. Project Information

A. Project Description, site address and driving directions

Angora Creek drains a 5.8 square mile watershed on the south shore of Lake Tahoe, entering the Upper Truckee River on the Lake Tahoe Golf Course (Figure 1.1). The project area encompasses about 15 acres at two different locations, as illustrated on the site maps in

Appendix C. Watershed area at the downstream end of the project area is 2.25 square miles.

Elevation at the lower end of the project area is 6,350 ft; the top of the watershed is Echo Peak at around 8,895 ft.

The Project will restore geomorphic function and aquatic habitat to approximately 1,200 feet of

Angora Creek, as well as restore 2 acres of meadow habitat within the footprint of the existing man-made Seneca Pond. Angora Creek is impaired as a result of the Lake Tahoe Boulevard road and stream crossing construction which caused channel incision, as well as the impacts from the Angora Fire in 2007, both of which resulted in a deficit of woody debris in the system.

The major impairments to stream channel function are limited woody debris in Reach 2, and channel incision and lack of woody debris in Reach 3. Restoration in Reach 2 (588 feet) will be achieved by installing woody debris structures, using techniques for hand installation resulting in minimal disturbance to the channel bed and bank surfaces. No excavation into channel bed or banks will occur during installation of wood structures in Reach 2. For Reach 3 (622 feet), restoration will be achieved by construction of a new river channel sized to convey a flow of 19 cubic feet per second (cfs). Woody debris structures and grade control weirs will be installed in the new channel, and woody debris structures will also be placed in the decommissioned channel sections. These actions are illustrated in the Design Plans presented in Appendix D.

The new channel construction will increase the frequency and duration of overbanking and associated sediment deposition on the floodplain and still carry the expected bed and suspended sediment loads. This will reduce overall loading of fine sediment to Lake Tahoe by decreasing rates of channel erosion and increasing deposition of fine sediment produced from the upper watershed onto the floodplain.

The project will also obliterate the existing man-made Seneca pond. A channel referred to as the Seneca Pond ditch, will be blocked and breached as directed by the project manager (hand crew work) to ensure that flow from a natural spring is no longer diverted into the pond. These spring flows are currently flowing down into their natural flow path away from the pond, but local residents often attempt to redirect these flows back into this ditch. An ephemeral swale will be constructed through the restored pond footprint that reflects natural drainage patterns.

These actions will restore 8.5 acres of wet meadow within and adjacent to the Seneca pond footprint. These features and actions are illustrated on the Site Map in Appendix C, and the

Design Plans presented in Appendix D.

The access road to be used for Angora creek channel restoration is located off a small unnamed county spur road, located next to the north side of the Angora Creek Channel, off of Lake Tahoe

Boulevard. There will be 800 feet of temporary encapsulated road off the small spur road to new channel construction, as well as a 0.25 acre temporary staging and stockpile area. The access road for Seneca Pond decommissioning is located off of Seneca Road, off of Lake Tahoe

Boulevard, on USFS administrative use road 12N20.

B. Estimated Phasing and Implementation Schedule

Channel construction activities are anticipated to begin in summer of 2015 after channel flows have dropped to 0.5 cfs. From previous observations, this is estimated to occur around August

1. Temporary road and stream crossings installation, water diversion installation and beaver dam removal will take place prior ground disturbing activities. All restoration activities are planned to be completed in the summer of 2015 and the phasing is illustrated on the Gandt chart provided in Appendix G.

All ground disturbing activities are anticipated to be completed by October 1 in order to allow time for temporary access road and staging area removal prior to October 15.

C. WDID

Current WDID under Board Order No. R6T-2011-0019: ____TBD________

The current WDID under Board Order No. R6T‐2011‐0019 will be added as a SWPPP Amendment as specified in the Required Changes section of this document.

D. Potential Construction Site Pollutants of Concern and Sources

The following is a list of construction materials that will be used and that have the potential to contribute pollutants, other than sediment, to storm water runoff:

Vehicle fluids, including oil, grease, petroleum and coolants;

BMP materials (sandbags, geotextile fabrics, ¾ inch aggregate base);

Hydromulch and tackifier; and

General litter.

The following is a list of construction activities that have the potential to contribute sediment to storm water discharges or Angora Creek:

Clearing and grubbing operations

Installation and removal of diversion dams;

Excavation and grading operations;

Soil and rock import operations;

Channel and floodplain installations;

Jetting placed gravels and rock materials;

Wood structure installation;

Beaver dam removal;

Dewatering and stream diversion operations; and

Channel flushing operations.

E. Site Location Maps

The construction Site Maps showing the project location, geographic features, construction site perimeter, staging areas and general topography are located in Appendix C and in the

Construction Plans in Appendices D. Table 2 below identifies the figure or map where the required elements are illustrated.

Table 2. Required Map Information

Included on Map/Sheet No. Required Element

Appendix C Figure 1 and Figure 2 Appendix D Construction Plans (CP) Angora Creek- Sheet C-2

Project Location Map Project construction limit boundaries

Appendix C Figure 1 and 2 Appendix D Construction Plans (CP) Angora Creek- Sheet C-13

Materials stockpile area, road access Stream crossings

Appendix C Figures 1 and 2 Disturbed Soil Areas (DSAs)

Appendix C Figures 1 and 2 Surface water locations, including SEZ boundaries, 100-year floodplain, ephemeral and intermittent waterways, springs and wetlands

N/A ,refer to narrative in SWPPP

BMP locations (filter fence, coir logs)

N/A Existing storm water structures and controls

Appendix D Drainage patterns and slopes anticipated after major grading activities

N/A

Post-construction storm water structures and controls

N/A, see Appendix K, Water Quality Sampling and Analysis Plan

Locations of designated storm water discharge sampling

1DSA maps will be kept updated to reflect site conditions.

III. Best Management Practices

Where the Project Technical Specifications found on the design plans in Appendix D conflict with information in this SWPPP, the information provided in this document shall override the

Technical Specifications.

A. Site Management

Construction site management shall consist of controlling potential sources of water pollution before they come in contact with storm water systems or watercourses. Appropriate site management measures shall be implemented to control material pollution and manage waste by implementing effective handling, storage, use and disposal practices. Additionally, many non-storm water pollution control BMPs (below) are necessary for proper site management.

Waste management and materials pollution control BMPs shall be implemented to minimize storm water contact with construction materials, wastes and service areas and to prevent materials and wastes from being discharged off-site. The primary mechanisms for storm water contact that shall be addressed include:

Direct contact with precipitation

Contact with storm water run-on and runoff

Wind dispersion of loose materials

Direct discharge to Angora Creek, or its tributaries through spills or dumping

The following Waste Management and Materials Pollution Control BMP table (Table 3) lists the

BMPs that shall be implemented to handle materials and to control construction site wastes associated with these construction activities. CASQA Fact Sheets for Waste management and

Materials Pollution Control BMPs are provided in Appendix B. Additionally, Table B-1 identifies which BMPs apply to specific activities.

Table 3. CONSTRUCTION SITE MANAGEMENT

WASTE MANAGEMENT AND MATERIALS POLLUTION CONTROL BMPs

CASAQ

Fact Sheet

BMP Name Minimum Require-ment1

BMP Used If Not Used, Why

YES NO

WM-1

Material Delivery and Storage

WM-2 Material Use

WM-3

Stockpile Management

WM-4

Spill Prevention and Control

WM-5

Solid Waste Management

WM-6

Hazardous Waste

WM-7

Contaminated Soil

No contaminated soil on site

WM-8

Concrete Waste Management

No concrete proposed

WM-9

Sanitary/Septic Waste

WM-10

Liquid Waste Management

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

The following list of BMPs and the associated narrative explain how the selected BMPs will be incorporated into the project. Where CASQA Fact Sheets contradict information contained in the Construction Plans (CP), the more stringent criteria (as determined by the Project Manager) shall apply.

WM-1, WM-2. WM-3: Materials Delivery, Storage and Use, Stockpile Management

In general, BMPs shall be implemented to help prevent discharges of construction materials during delivery, storage and use. The general material storage area for the Angora Creek

Restoration project components will be located in the approximately quarter acre staging area as shown in Appendix C, Figure 1. At this time the only materials planned to be stockpiled will be BMP materials (filter fabric, straw logs, etc.), however a silt settling tank may be placed here for the groundwater dewatering if necessary. Imported soil will be used to construct the encapsulated road. All imported soil will be placed directly onto the encapsulated road surface upon delivery and will be removed from the site upon completion of the project. No imported soil will be used in the construction of new channel or fill of old channel. All excavated soil will be utilized the same day as backfill material within the project. Any excavated soil not used the same day will be left for overnight and weekend storage on the encapsulated road. The gravel/rock/boulder stockpiles will be delivered as needed. Any gravel/rock/boulder that cannot be used the same day as delivered will be stored on the encapsulated road.

The Angora Creek stockpile area will be completely encapsulated if the soil at the site is wet during installation; or the river side of the area will have coir logs installed if it is dry enough to operate directly on the existing ground.

At Seneca Pond, a staging area will not be constructed, instead the existing USFS road 12N22 access road will be used for equipment parking and re-fueling. Sod will be delivered from the

Angora Creek site to Seneca Pond and place immediately in the construction area without need to stockpile.

WM-4 Spill Prevention and Control

Spill Prevention and Control shall be implemented to contain and, if necessary, clean-up spills associated with any equipment refueling or repair activities to prevent material discharges to groundwater, streams or waterways. A spill kit will be kept on-site during heavy equipment operation.

All equipment refueling and repair will be conducted either offsite or on the encapsulated temporary road. All refueling of pumps will occur over an absorbent pad. Since most of the work takes place within Stream Environment Zones, it is required that all equipment has the hydraulic fluid drained and replaced with vegetable or mineral (biodegradable) oil before delivery.

WM-5, WM-6 Solid and Hazardous Waste Management

Solid wastes (trash) shall be disposed offsite daily. Liquid hazardous waste shall be disposed of offsite the same day it is generated. No onsite storage will occur.

WM-9 Sanitary and Septic Wastes

A portable toilet shall be trailered on and off site daily, and will be parked at vehicle parking locations at the entrance to the access road at Angora Creek, and at the intersection of Road

12N20 and 12N22 for Seneca Pond. Wastes shall be disposed offsite. The toilet trailer shall not interfere with traffic flow.

WM-10 Liquid Waste Management

The only liquid waste anticipated to be generated from this project is water that may have elevated turbidity. Turbid water management BMPs shall be implemented during channel flushing and stream diversion activities, or any other operation that has the potential to generate runoff. The primary method that will be used to minimize turbid water in the channel will be through the use of diversions to route clear channel flows and ground water around the work area (see NS-5 and NS-2). In addition, turbid water generated during new channel jetting and flushing will be pumped to a settling tank, prior to discharging water back into the stream.

Since this work is to be contracted, details will be added to the SWPPP through an amendment when they are available.

B. Sediment and Erosion Control

Erosion Control

Erosion control is any source control practice that protects the soil surface and prevents soil particles from being detached by rainfall, flowing water or wind. Erosion control consists of using project scheduling and planning to reduce soil and/or vegetation disturbance, controlling drainage away from disturbed areas and preparing and stabilizing disturbed soil areas.

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

Preserve existing vegetation where required and when feasible;

Control the area of soil disturbing operations such that erosion control BMPs (Table 4) can be quickly and effectively implemented or the site can be permanently stabilized in that area;

Apply permanent erosion control measures to disturbed soil areas prior to the completion of construction.

Sufficient erosion control materials (i.e. filter fabric, coir logs, etc.), equivalent to approximately an additional 10% of what is required for the project, shall be maintained onsite to allow implementation and upkeep in conformance with this SWPPP. This includes implementation requirements for active and non-active areas that require deployment before the onset of rain.

The following erosion control BMP selection table (Table 4) includes the BMPs that shall be implemented to control erosion during construction. CASQA Fact Sheets for temporary erosion control BMPs are provided in Appendix B.

Table 4. EROSION CONTROL BMPs

CASAQ

Fact Sheet

BMP Name Minimum Require-ment1

BMP Used If Not Used, Why

YES NO

EC-1 Scheduling

EC-2

Preservation of Existing Vegetation

EC-3 Hydraulic Mulch

EC-4 Hydroseed Not necessary

EC-5 Soil Binders Not necessary

EC-6 Straw Mulch

EC-7

Geotextiles and Mats

EC-8 Wood Mulching only on 60 feet of temporary road at Seneca Pond

EC-9

Earth Dikes and Drainage Swales

EC-10

Velocity Dissipation Devices

EC-11 Slope Drains Not necessary

EC-12

Stream Bank Stabilization

EC-14

Compost Blankets

Not necessary

EC-15

Soil Preparation- Roughening

EC-16

Non-Vegetated Stabilization

WE-1

Wind Erosion Control

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

The following list of BMPs and narrative explain how the selected BMPs will be incorporated into the project. Where CASQA Fact Sheets contradict information contained in the Technical

Specifications or the Construction Plans, the more stringent criteria (as determined by the

Project Manager) shall apply.

EC-1, EC-2 Scheduling and Preservation of Existing Vegetation

Controlling the timing of construction activities through project phasing will be used to prevent excessive compaction, erosion and sediment delivery. Generally, surface disturbing activities are planned to begin on or after July 6th and continue no later than October 1st, (depending on when base flows reach approximately 0.5 cfs).

The project schedule will sequence construction activities with the installation of soil stabilization and sediment control measures. BMPs will be deployed in a sequence to stay ahead of grading and construction activities progress. Appropriate BMPs will be deployed prior to the initiation of all work tasks related to the BMPs. The construction sequencing will be arranged as much as practicable to leave existing vegetation and other ground cover undisturbed until immediately prior to grading. A pre-grade inspection will be conducted of the site BMPs with LRWQCB and TRPA for approval prior to initiating any earthwork activities.

Ground and surface water diversions and beaver dam management will be implemented prior to ground disturbing activities to achieve suitable groundwater and soil moisture conditions.

The access road will be entirely encapsulated (see TC2) and will be located to avoid impact to existing shrubs and trees. A portable, temporary spur road system made of DuraDeck and/or crane mat, or equivalent product will be used to create construction access over the meadow surface from the temporary encapsulated access road to the new channel construction area.

The encapsulated access road and Duradeck/crane mat spur roads will preserve the underlying meadow vegetation and minimize ground disturbance.

All sod removed from construction areas will be carefully preserved and used to stabilize channel banks, floodplain surfaces, and restored meadow surface around Seneca Pond. Sod placement will be conducted as described on the Design Plans in Appendix D.

EC-3 Hydraulic Mulch

Hydraulic mulch will be used in combination with native seed spreading (appropriate for wet meadow sites) to stabilize and provide cover for disturbed areas where salvaged vegetation is not sufficient to stabilize disturbed surfaces within the decommissioned Angora channel, Seneca Pond, and staging area, as well as any disturbed areas adjacent to the newly constructed channel, not covered with harvested sod. Any compacted areas will also be ripped.

EC-7 Geotextiles and Mats

Filter fabric of sufficient tensile strength to minimize tearing during use and removal, will be used in the encapsulated haul road installations to contain the road fill material and runoff that may result from the compacted temporary road.

EC-8 Wood Mulching

Wood mulching will only be used to provide ground cover and prevent erosion on the small temporary access roads at the Seneca Pond work area.

EC-9 Earth Dikes and Drainage Swales

Raised vegetated strips will be constructed along the existing channel backfill to create additional long-term floodplain roughness and prevent flood waters from concentrating along this alignment.

A sod lined swale will be constructed to convey overflow water from an existing 18” CMP from an existing County sediment basin to the new creek alignment.

A sod lined swale will also be constructed through the former Seneca Pond footprint to provide a flow path for ephemeral flows entering the area from upslope.

EC-10 Velocity Dissipation Devices

Velocity dissipation devices will be used at the outlet of the clear water diversions where the concentrated flow has the potential to disturb and mobilize streambed material. These devices will be constructed of sandbags and/or rock (6”-12”) placed on the streambed. Velocity dissipation devices will also be used at the hose or diversion outlet while flushing the new channel.

EC-12 Stream Bank Stabilization

A primary purpose of the Project is to construct an appropriately sized and stable river channel with a more engaged and dynamic floodplain system within the project area. Several bed and bank treatment measures (sod revetment, wood structure, rock weirs) are prescribed for the new channel sections in order to maintain long term stability and minimize erosion as shown in

Appendix D, CP Sheets C-6 through C10.

EC-15 Soil Preparation / Roughening

Compacted areas to be decommissioned at the end of implementation will be roughened to increase water infiltration capacity and prepare the surface for revegetation. This will be accomplished by ripping the soil to a depth of 6-12 inches. Areas that are anticipated to be roughened in this way include only the staging area, since all travel ways will occur on the encapsulated road or Dura deck.

EC-16 Non-Vegetated Stabilization

The newly constructed channel will receive stream substrate to construct the riffles (riffle material specifications are found in Appendix D, CP sheets C11. Riffle gravels will be clean washed material. Constructed riffles will provide long-term grade control and channel bed stabilization.

Large wood and rock will be used for bed and bank installations in selected areas as grade control and to stabilize stream banks where the new channel ties into the existing channel.

WE-1 Wind Erosion Control

Water shall be applied to disturbed soil areas to control dust. The water will be applied using water trucks or pumped directly from the stream channel. Water application rates will be minimized as necessary to prevent runoff and ponding. Watering equipment leaks will be repaired as soon as possible.

Dust control will be applied as needed in stockpile/staging areas, along temporary encapsulated access roads, and at the site of grading activities. In general, if airborne dust can be visibly detected, water will be applied to the area.

During windy conditions (forecast or actual wind conditions of approximately 25 mph or greater), dust control will be applied to all DSAs, including access roads, to adequately control wind erosion.

Sediment Control

Sediment controls are structural measures that are intended to complement and enhance the selected erosion control measures and reduce sediment discharges from construction areas.

Sediment controls are designed to intercept and settle out soil particles that have been detached and transported by the force of water. Additional temporary sediment control materials, equivalent to 10% of the installed quantities on the site, will be maintained onsite throughout the duration of the project for implementation in the event of predicted rain, rapid response to failures, or emergencies, as described below. This includes implementation requirements for active areas and non‐active areas before the onset of rain. The following sediment control BMP selection table (Table 5) includes the BMPs that shall be implemented to control sediment on the construction site. CASQA Fact Sheets for sediment control BMPs are provided in Appendix B.

Table 5. SEDIMENT CONTROL BMPs

CASAQ

Fact Sheet

BMP Name Minimum Require-ment1

BMP Used If Not Used, Why

YES NO

SE-1 Silt Fence

SE-2 Sediment Basin Not necessary

SE-3 Sediment Trap Not necessary

SE-4 Check Dam

SE-5 Fiber Rolls

SE-6 Gravel Bag Berm Not necessary

SE-7 Street Sweeping

Using stabilized construction entrance (TC-1) and will sweep the paved entrance when necessary

SE-8 Sandbag Barrier

SE-9

Straw Bale Barrier Not necessary

SE-10

Temporary Drain Inlet Protection Not necessary

SE-11 ATS Not necessary

SE-12

Temporary Silt Dike

Not necessary

SE-13

Compost Sock and Berm Not necessary

SE-14 Biofilter Bags Using other methods

TC-1

Stabilized Construction Entrance and Exit

TC-2

Stabilized Construction Roadway

TC-3

Entrance Outlet Tire Wash Not necessary

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

The following list of BMPs and narrative explain how the selected BMPs will be incorporated into the project. Where CASQA Fact Sheets contradict information contained in the Technical

Specifications or the Construction Plans, the more stringent criteria (as determined by the

Project Manager) shall apply.

SE‐1 Silt Fence and SE-5 Fiber Rolls Silt fences or coir logs will be installed along the edges of the road at the entrance and exit of the temporary stream crossings to intercept run‐off from the road, in case there is a breach in the encapsulated road fabric at these locations. The stockpile area at the Angora Creek restoration site will either be encapsulated or contained with coir logs/fiber rolls on the creek side. Additional installations may be required at the direction of the QSD or QSP.

SE-4 Check Dam

Sand bag check dams will be constructed periodically along the newly constructed Angora

Creek channel during flushing to meter flows through the channel and back water up so it can be pumped until it meets turbidity requirements.

SE-8 Sandbag Barrier

Clean sand or gravel bag barriers enclosed in impermeable polyethylene sheeting may be used as coffer dams in the existing channel to isolate reaches for clean water diversions. Techniques for constructing coffer dams will be determined by the Contractor selected to install and operate the clean water diversion. Details will be added to SWPPP when available.

TC‐1 Stabilized Construction Entrance and Exit and TC-2 Stabilized Construction Roadway

The entrance to the encapsulated temporary road from the paved spur road off Lake Tahoe

Blvd will be rock armored to prevent tracking dirt onto the roadway.

An encapsulated temporary access road will be located parallel to the new channel alignment, and will begin from the County spur road adjacent to the Angora creek crossing at Lake Tahoe

Boulevard. The encapsulated access road will located adjacent to the new channel alignment, and will be a maximum of 20 feet wide, with two 40 foot maximum turnarounds and passing areas. The fill material for the encapsulated road will come from stockpiled material at the

Upper Truckee River Reach 5 project. Because of expected moist soil conditions, the entire access road will be constructed as an encapsulated road. Encapsulated road fill will be removed in a way to avoid ripping and tearing of encapsulating fabric, avoiding spillage of sediments onto floodplain services, and fill material will be transported back to the Upper Truckee River

Reach 5 project stockpile area.

Access spur roads will occur on Duradeck and/or crane mats. These spur roads will require a limited number of passes and will be moved frequently as construction progresses along the new and existing river alignments. The location and number of spur road segments is not currently known, but will be minimized and will be located to avoid existing shrub and tree vegetation to the extent feasible. Encapsulated road will be removed in sequence as new channels sections with concurrent old channel backfill are completed.

C. Non-Storm water and Material Management

The selection of non‐storm water BMPs is based on the list of construction activities with a potential for non‐storm water discharges identified above. The following non‐storm water control BMP selection table (Table 6) includes the BMPs that shall be implemented to prevent non‐storm water discharges at the construction site. CASQA Fact Sheets for non-storm water control BMPs are provided in Appendix B.

Table 6. NON-STORM WATER POLLUTION CONTROL BMPs

CASAQ

Fact

Sheet BMP Name

Minimum Require-ment1

BMP Used If Not Used, Why

YES NO

NS-1

Water Control and Conservation

NS-2

Dewatering Operations

NS-3

Paving and Grinding Operations

No paving or grinding in project

NS-4

Temp Stream Crossing

NS-5

Clear Water Diversion

NS-6

Illicit Connection and Illegal Discharge Connection

NS-7

Potable Water/ Irrigation

NS-8

Vehicle and Equipment Cleaning

NS-9

Equipment Fueling

NS-10

Equipment Maintenance

NS-11

Pile Driving Operations

No pile driving in project

NS-12 Concrete Curing

NS-13 Concrete Finishing

NS-14

Material and Equipment Used Over Water

NS-15

Demolition/ Removal Adjacent to Water

Not necessary with stream diversions installed

NS-16

Temporary Batch Plants

Not necessary

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

The following list of BMPs and narrative explain how the selected BMPs will be incorporated into the project. Where CASQA Fact Sheets contradict information contained in the Technical

Specifications or the Construction Plans, the more stringent criteria (as determined by the

Project Manager) shall apply.

NS-1, NS-7 Water Control/Conservation and Irrigation

Water application rates for dust control and irrigation will be minimized as necessary to prevent runoff and ponding. Water equipment leaks will be repaired immediately. Irrigated areas within the project area will be inspected for excess watering. Watering times and schedules will be adjusted to ensure that the appropriate amount of water is being use to minimize runoff.

Because of the naturally high ground water levels, irrigation is expected to be minimal. The only irrigation currently planned will be utilization of a water truck to irrigate imported sod at

Seneca pond, for a few weeks after sod placement. Flows will be introduced to the new channel slowly during flow initiation, to allow for further settling and seating of fine sediments.

Turbidity levels will be monitoring during this activity as described in Appendix K.

NS-2, NS-5 Dewatering Operations and Clear Water Diversion

Surface flow in the existing Angora Creek will be diverted around sections of new channel being built, until the new channel is ready to receive these flows at the end of construction. Because the slope of the Angora meadow in this area is so slight and the channel is so incised, gravity diversions will not be feasible. Therefore a pump diversion system will be used to route Angora creek flows around the new channel as it is being built and the existing channel filled.

In addition ground water will be pumped and diverted using well points along the north-west edge of the project area as needed to achieve a groundwater depth of five feet in areas of channel construction and fill. Pumped ground water that does not meet turbidity requirements will be pumped and sprinkled to the upland dewater area (Fig 1). If necessary to meet turbidity requirement groundwater will first be pumped to a sediment basin (weir tank) for treatment, then pumped and sprinkled to the upland dewater area. Some pumped ground water may be used for irrigation of areas of placed harvested sod and flushing of the constructed channel, if turbidity levels are acceptable (less than 20 NTU).

We do not anticipate starting clear water diversions until base flows are at one cfs or lower;

however the precise rate of flow will be negotiated with the contractor and added to the

SWPPP as an amendment once the final diversion plan is complete. The diversion system will be capably of diverting a minimum of three cfs. There will be a primary and backup pump with the backup pump operated by auto start by float controls. Channel flows will be diverted through the entire period of Angora channel construction, including nights and weekends. The system will be on a telemetry alarm agent to alert the contactor and project manager of operational issues 24 hours a day for the duration of the diversion.

The design, capacity, location and timing /scheduling of diversion activities will be determined after a contractor is selected to design and implement this system. The preferred final diversion and dewatering plan will be provided to Lahontan for review and acceptance prior to implementation. Lahontan will be given 3 to 5 business days for their review and acceptance of the plan. The final design and operation plan for the diversion and dewater plan will be added to the SWPPP as an amendment prior to implementation.

Figure 1. Angora Creek Restoration Upland Dewater Area

Specifications for appropriate measures to avoid impacts to aquatic organisms and to prevent larger debris from being sucked into the system will be required in the contract. Prior to channel diversion, all fish will be removed from the affected reach by the LTBMU fisheries crew.

During operation of clear water diversions the QSP will closely monitor the 5-day forecasted weather. If available diversion capacity is needed to divert elevated surface flows in response to summer storm events, ground water pumping and diversion will be postponed as necessary in order to utilize the maximum diversion capacity for surface flows. If surface flow are expected or observed to exceed the pumped diversion capacity, the diversion check dam will be raised as necessary and sand bag features constructed on the floodplain to direct surface flows into adjacent floodplain surfaces including side channels.

The diversion contract will include specifications to ensure additional pumps and piping will be available on site during all scheduled diversion operations so that in the event of a sudden or un-forecasted event or pump failure, additional pumps and piping can be quickly installed. The maximum diversion capacity will be determined during the development of the diversion contract.

Constructed channel segments will be jetted and flushed to facilitate the settling of sediments.

Because of the naturally high ground water levels, turbid water will not be pumped and sprayed on to adjacent floodplain surfaces. Turbid water pumped from new channel flushing and pumped groundwater will be pumped to the upland dewater area (Fig1), until a discharge level of 5 NTUs in 0 .5 cfs discharge is achieved, before reintroducing this water back into the stream channel. The dewater area will have perimeter BMPs (coir logs) installed if discharged water does not fully infiltrate before reaching the stream channel.

Full new channel activation will not commence until the LTBMU Project Manager, Lahontan

RWQCB and TRPA agree that the conditions are acceptable.

NS-4 Temporary Stream Crossings

Timber landing mats will be used to cross the existing channel at two locations as illustrated on the construction Plans (Appendix D, CPS sheet 13). This type of crossing will not require diverting flows during installation and operation. Encapsulated road base will be placed over the timber mats to prevent spillage of sediments from equipment tracks/tires, when in use.

Timber landing mats will be removed when the existing channel is filled to the location of that temporary crossing.

There is a rock ford stream crossing across and intermittent channel on FS 12N22 that will be crossed to access Seneca Pond. There is a potential for 2-3 truck trips per day for approximately two weeks along this road. However, it is anticipated that during this construction period (August 3-28) this channel will be dry. Therefore, no temporary crossing is planned at this time. However, the QSP will inspect this crossing daily during use to determine if protective measures are necessary.

NS-6 Illicit Connection and Illegal Discharge Connection

There are no known areas of pre-existing contamination within the project area. The LTBMU will implement the Illicit Connection/Illegal Discharge Detection Reporting BMP prior to beginning project activities and throughout the duration of the project.

NS-8, NS-9, NS-10 Vehicle and Equipment Operations

Several types of vehicles and equipment will be used onsite throughout the project, including but not limited to pick-up trucks, excavators, loaders, dump trucks, water trucks and pumps.

Vehicles will be cleaned and inspected prior to arrival on site. Vehicle cleaning will also be performed onsite to remove excess dirt/mud from equipment prior to leaving the site. This type of cleaning will take place within the staging area or on the encapsulated road and be performed such that excess runoff is not generated.

Fuel trucks, each equipped with absorbent spill clean‐up materials, shall be used for all onsite fueling on the encapsulated road, or the paved County spur road positioned at least 50 feet from the Angora Creek. If mobile maintenance is necessary (e.g., due to an equipment failure within the construction area that prevents the equipment from be moved to the encapsulated road, drip pans and/or absorbent pads shall be used to prevent any contamination of the site.

Pumps will be refueled within SEZ areas. Pumps will be located on absorbent pads during operations near the live channel, and will be kept on drip pans to prevent leakage during refueling operations. Fuel cans will be kept on drip pans when stored on the meadow surface.

Drip pads or absorbent pads will also be used as needed if spills occur while refueling…