B08_Attachment_07_140P8423R0006_Draft_SWPPP_0001.pdf

Construction SWPPP

CONSTRUCTION STORMWATER

POLLUTION PREVENTION PLAN

(SWPPP)

PROJECT NAME: LAGOON CREEK REST AREA REHABILITATION

CONTRACTOR NAME:

RISK LEVEL: 2

DATE: MAY 2023

Prepared for:

National Park Service

Note: This Construction SWPPP must be maintained at the site and available for review upon request by the Regional Water Quality Control Board.

Table of Contents Table of Contents

Amendment Log

Section 1 SWPPP Requirements

1.1 Introduction

1.2 General Permit Coverage

1.3 SWPPP Availability and Implementation

1.4 SWPPP Amendments

1.5 Retention of Records

1.6 Required Non-Compliance Reporting

1.7 Annual Reporting

1.8 Changes to Permit Coverage

1.9 Project Close out

Section 2 Project Information

2.1 Project and Site Description

2.1.1 Site Description

2.1.2 Existing Conditions

2.1.3 Existing Drainage

2.1.4 Historic Sources of Contamination

2.1.5 Geology and Groundwater

2.1.6 Project Description

2.1.7 Developed Condition

2.1.8 Construction Quantities

2.2 Permits and Governing Documents

2.3 Stormwater Run-On from Offsite Areas

2.4 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

3.2.3 Drainage 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

3.3.3 Spill Reponses and Reporting Procedures

3.4 Post construction Stormwater Management Measures

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

4.1 BMP Inspection and Maintenance

4.2 Rain Event Action Plans

Section 5 Training

Section 6 Responsible Parties and Operators

6.1 Responsible Parties

6.2 Contractor List

Section 7 Construction Site Monitoring Program

7.1 Purpose

7.2 Applicability of Permit Requirements

7.3 Weather and Rain Event Tracking

7.3.1 Weather Tracking

7.3.2 Rain Gauges

7.4 Monitoring Location and Personnel

7.5 Safety and Monitoring Exemptions

7.6 Visual Monitoring

7.6.1 Routine Observations and Inspections

7.6.2 Rain-Event Triggered Observations and Inspections

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 Non-Visible Pollutants in Stormwater Runoff Discharges

7.7.2 pH and Turbidity in Stormwater Runoff Discharges

7.7.3 Non-Stormwater Discharges

7.8 Training of Sampling Personnel

7.9 Sample Collection, Preservation and Delivery

7.9.1 Sample Collection Methods

7.9.2 Field Measurement Methods

7.9.3 Sample Containers and Handling

7.9.4 Forms and Procedures Sample Collection and Field Measurements

7.9.5 Laboratory Communication Procedures

7.9.6 Sample Shipping/Delivery and Chain of Custody

7.9.7 Sample Preservation and Filtration

7.10 Quality Assurance and Quality Control

7.10.1 Field Logs

7.10.2 Clean Sampling Techniques

7.10.3 Chain of Custody

7.10.4 QA/QC Samples

7.10.5 Data Verification

7.11 Data Management and Reporting

7.11.1 Analytical Data Validation

7.11.2 Electronic Data Transfer

Section 8 References

Appendix A: Calculations

Appendix B: Site Maps

Appendix C: Permit Registration Documents and LRP Certification

Appendix D: SWPPP Amendment Certifications

Appendix E: Annual Reporting

Appendix F: Submitted Changes to PRDs

Appendix G: Construction Schedule

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

Appendix I: CASQA Stormwater BMP Handbook Portal: Construction Fact Sheets

Appendix J: Inspection and Monitoring Forms

Appendix K: Weather Reports & Rain Event Action Plan

Appendix L: Training Reporting Form

Appendix M: Responsible Parties

Appendix N: Contractors and Subcontractors

Appendix O: Construction General Permit

CSMP Attachment 1: Chain of Custody Form

CSMP Attachment 2: Field Meter Instructions

CSMP Attachment 3: Supplemental Information

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

“This Stormwater Pollution Prevention Plan and Attachments were prepared under my direction to meet the requirements of the California Construction General Permit (SWRCB Orders No.

2009-009-DWQ as amended by Order 2010-0014-DWQ). I certify that I am a Qualified SWPPP Developer in good standing as of the date signed below.”

QSD Signature

Nathan Anderson

Date

28416

QSD Name

Klamath Network Engineer, NPS

QSD Certificate Number

Title and Affiliation nathan_w_anderson@nps.gov

541-324-1523

Email Telephone Number

Amendment Log

Lagoon Creek Rest Area Rehabilitation

Include references to section of SWPPP that has been amended, add additional pages as needed.

Amendment No. Date Brief Description of Amendment, include section and page number Prepared and Approved By

Name:

QSD#

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Section 1 SWPPP Requirements

1.1 INTRODUCTION

This Stormwater Pollution Prevention Plan (SWPPP) was prepared for construction activities at the the Lagoon Creek Rest are located south of Crescent City California, in Redwoods National Park, along Highway 101. The project location is shown on the Site Map included in Appendix B.

This SWPPP is designed to assist the proejct’s compliance with California’s General Permit for Stormwater Discharges Associated with Construction and Land Disturbance Activities (General Permit) Order No.

Order No. 2009-0009-DWQ (NPDES No. CAS000002) issued by the State Water Resources Control Board (SWRCB). In accordance with the General Permit, Section XIV, this SWPPP is designed to address the following objectives

• “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 (RWQCB) permit, all non-stormwater discharges are identified and either eliminated, controlled, or treated;

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

Design details for BMP controls applicable to this project are included in the proejct plan set.

1.2 GENERAL PERMIT COVERAGE

The Legally Responsible Party (LRP), (National Park Service), has submitted the Permit Registration Documents (PRDs) to the SWRCB Stormwater Multi-Application and Report tracking system (SMARTS).

The SWRCB has issued a Waste Discharge Identification (WDID) number as indicated below:

WDID:_________

1.3 SWPPP AVAILABILITY AND IMPLEMENTATION

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

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

1.4 SWPPP AMENDMENTS

The General Permit requires the SWPPP to be revised when:

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• If there is a General Permit violation.

• When there is a reduction or increase in total disturbed acreage.

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

Additionally, the SWPPP shall be revised when:

• There is a change in construction or operations which may affect the discharge of pollutants to surface waters, groundwater(s), or a municipal separate storm sewer system (MS4);

• When there is a change in the project duration that changes the project’s risk level;

• To identify any new contractor and or subcontractor that will implement a measure of the SWPPP; or

• When deemed necessary by the QSD.

The following items shall be included in each amendment:

• Who requested the amendment;

• The location of proposed change;

• The reason for change;

• The original BMP proposed, if any; and

• The new BMP proposed.

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 and logged in the Amendment Log on page 2 of the SWPPP. Additionally a SWPPP Amendment Certification shall be completed by the QSD and maintained in Appendix D, for each amendment.

The following changes listed in Table 1.1 have been designated by the QSD as "to be field determined” and constitute minor changes that the QSP may implement based on field conditions, and do not required a SWPPP amendment. The SWPPP progress map shall be updated to reflect field changes.

Table 1.1 List of Changes to be Field Determined

Changes for field location or determination by

QSP(1)

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

Increase quantity of an erosion or sediment control measure

Relocate/Add stockpiles or stored materials

Relocate or add toilets

Relocate vehicle storage and/or fueling locations

Relocate areas for waste storage

Relocate water storage and/or water transfer location

Changes to access points (entrance/exits)

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Table 1.1 List of Changes to be Field Determined

Changes for field location or determination by

QSP(1)

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

Change type of erosion or sediment control measure

Changes to location of erosion or sediment control

Minor changes to schedule or phases

Changes in construction materials

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

1.5 RETENTION OF RECORDS

The contractor must provide a copy of the SWPPP, all required PRDs, inspection reports, compliance certifications and annual reports, non-compliance reports, and training records to the LRP upon project completion. The LRP will retain this information for at least 3 years from the date that the site is finally stabilized. The contractor must retain a copy of the SWPPP and inspection reports at the construction site from the date of project initiation to the date coverage under the General Permit are terminated.

1.6 REQUIRED NON-COMPLIANCE REPORTING

Corrective measures will be implemented immediately following pollutant laden discharges (e.g. sediment, concrete) or following written notice of non-compliance from the Regional Water Quality Control Board (RWQCB). Discharges and corrective actions will be documented on the Effluent Sampling Form in Appendix J.

The report to the District will contain the following items:

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

• The cause or nature of the notice or order.

• The control measures (BMPs) deployed before the discharge, 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 7.7.2.6.

1.7 ANNUAL REPORTING

The General Permit requires all projects that are enrolled for more than one continuous three-month period to submit information and annually certify that their site is in compliance with these requirements. The primary purpose of this requirement is to provide information needed for overall program evaluation and pubic information.

An annual report, for the reporting year of July 1 – June 30, must be completed, by September 1 of each year until a NOT has been filed in the SWRCB’s SMARTS database. The QSP is responsible for submitting

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the annual report information to the LRP by August 1 of each year. The LRP will review the report information for completeness and accuracy and upload the required information to the SWRCB’s SMARTS database by September 1 of each year. Use the Annual Report form in Appendix E to prepare the Annual Report submittal to the LRP.

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 documented in the Amendment Log on page 2 of this SWPPP. QSD certification of SWPPP amendments are to be kept in Appendix D. Updated PRDs submitted electronically via SMARTS can be found in Appendix F.

1.9 PROJECT CLOSE OUT

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 RWQCB will consider a construction site complete when the conditions of the General Permit, Section II.D have been met.

• The site will not pose any additional sediment discharge risk than it did prior to the commencement of construction activity.

• There is no potential for construction related stormwater pollution.

• All elements of the SWPPP have been completed and final stabilization has been reached.

• Construction materials and waste have been properly disposed.

• An Annual Report has been filed for project longer than three (3) months.

• The site is in compliance with all local stormwater management requirements.

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Section 2 Project Information

2.1 PROJECT AND SITE DESCRIPTION

2.1.1 Site Description

The Lagoon Creek project site comprises approximately two acres and is located along Highway 101, south of Crescent City , California. The project is identified on the Site Map in Appendix B.

2.1.2 Existing Conditions

As of the initial date of this SWPPP, the project site is primarily a parking lot and associated rest-stop area.

Any historic sources of contamination are descibed in Section 2.1.3.

2.1.3 Existing Drainage

The project site is generally flat. The elevation of the project site ranges from 22 to 15 feet above mean sea level (msl). Surface drainage at the site currently flows to the southwest, towards an existing wetland. The wetland then drains to a small creek that discharges directly to the Pacific Ocean.

2.1.4 Historic Sources of Contamination

Prior to becoming a rest area, the Site was historically used as a wood mill that could potentially contribute pollutants to stormwater. It is unknown if there are any pollutants that may be presents related to past activites.

2.1.5 Geology and Groundwater

Groundwater occurs beneath the site at approximately five feet below ground surface. The groundwater gradient is toward the west. Little is known regarding the underlying geology.

2.1.6 Project Description

Project grading will occur on approximately 1.05 acres of the project, which comprises approximately 50 percent of the total area. The limits of grading are shown in the plan set. Grading will include both cut and fill activities, with the total graded material estimated to be 1000 cubic yards. Graded materials are expected to be balanced, with removed materials (primarily pavements) being hauled away, and new pavement materials brought in.

2.1.7 Developed Condition

Post construction surface drainage will be directed to the south and west similar to how it is currently. Most discharge will be collected and conveyed in new storm sewers. Some discharge will sheet flow off the site.

Post construction drainage patterns and conveyance systems are presented in the plan set

2.1.8 Construction Quantities

Complete Table 2.1 presents construction site area, % impervious and curve number, for existing and developed conditions. This information is required to complete site information in the PRDs in SMARTS.

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Table 2.1 Construction Site Estimates

Construction site area (Area of Potential Effect, APE) 1.6 acres

Disturbed Soil Area 1.05 acres

Percent impervious before construction 53 %

Runoff coefficient before construction 89

Percent impervious after construction 50 %

Runoff coefficient after construction 87

2.2 PERMITS AND GOVERNING DOCUMENTS

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

• Regional Water Quality Control Board requirements

• Contract Documents

• Federal Endangered Species Act

• National Historic Preservation Act/Requirements of the State Historic Preservation Office

2.3 STORMWATER RUN-ON FROM OFFSITE AREAS

Run-on to the site is generally limited. The primary source of run-of is is from highway 101, and it is generally limted to the east end. On the west end, the topogrpahy is such that run-on is captured by an existing drainage swale and routed around the site. Run-on from offsite shall be directed away from disturbed areas or shall collectively be in compliance with the effluent limitation of the General Permit.

The stormwater runoff drainage area contributing to offsite run-on is estimated to be approximately 0.5 acres. The anticipated runoff coefficients range from 72 to 98.

The General Permit requires that temporary BMPs be implemented to direct offsite run-on away from disturbed areas through the use of runoff controls. These BMPs will be located as shown in the plans.The offsite drainage areas and associated stormwater conveyance facilities or BMPs are shown in the plan set.

2.4 SEDIMENT AND RECEIVING WATER RISK DETERMINATION

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

The risk level was determined though the use of the Risk Determination Worksheet (Attachemt D.1). The risk level is based on project duration, location, proximity to impaired receiving waters and soil conditions.

A copy of the Risk Level determination submitted on SMARTS with the PRDs is included in Appendix C.

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Risk Level 2 sites are subject to both the narrative effluent limitations and numeric effluent standards. The narrative effluent limitations require stormwater discharges associated with construction activity to minimize or prevent pollutants in stormwater and authorized non-stormwater through the use of controls, structures and best management practices. Discharges from Risk Level 2 site are subject to Numeric Action Levels (NAL) for pH and turbidity shown in Table 2-3. This SWPPP has been prepared to address Risk Level 2 requirements (General Permit Attachment D).

Table 2.3 Numeric Action Levels

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

Turbidity NTU 250 NTU

2.5 CONSTRUCTION SCHEDULE

The site sediment risk was determined based on construction taking place between July 10th and October 31st. Modification or extension of the schedule (start and end dates) may affect risk determination and permit requirements. The contractor shall contact the LRP immediately if the schedule changes and the LRP and its QSD will assess potential impacts to the SWPPP. The estimated schedule for planned work can be found in Appendix G. Table 2.4 to be completeing jointly by the contractor after the NTP is issued.

Table 2.4 Construction Activity Milestones

Milestone Start Date End Date Date PRDs and filing fee submitted to SWRCB.

Project covered by General Construction Permit. A construction site is covered by the General Permit upon filing PRDs, fess and receipt of WDID number.

Initial ground-breaking (must occur after completion of SWPPP and receipt of WDID).

Implement erosion control measures* Implement sediment control measures (perimeter control, stabilized entrance, inlet protection).

Grading/excavation/trenching activities.

Paving activities.

Construction of structures and paved surfaces.

Site clean-up.

Anticipated construction completion date.

Anticipated filing of Notice of Termination (NOT).

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2.6 POTENTIAL CONSTRUCTION ACTIVITY AND POLLUTANT SOURCES

Appendix H includes a list of construction activities and associated materials that are anticipated to be used onsite. These activities and associated materials will or could potentially contribute pollutants, other than sediment, to stormwater runoff.

The anticipated activities and associated pollutants were used in Section 3 to select the BMP 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

7.7.1. For a full and complete list of onsite pollutants, refer to the Material Safety Data Sheets (MSDS), which are retained onsite at the construction trailer.

2.7 IDENTIFICATION OF NON-STORMWATER DISCHARGES

Non-stormwater discharges consist of discharges which do not originate from precipitation events. Per the District’s stormwater ordinance, Article 10 all non-stormwater discharges to the stormwater conveyance system that do not have a NPDES permit are considered illicit discharges and subject to enforcement.

Discharges from potable water sources are allowable provided the discharge does not cause erosion or carry other pollutants. Refer to Section 10.04 of Article 10 for a complete list of illicit discharges.

Non-stormwater discharges into storm drainage systems or waterways, which are not authorized under the Article 10 or the General Permit and listed in the SWPPP, or authorized under a separate NPDES permit, are prohibited.

Non-stormwater discharges that are authorized from this project site include the following: NONE

These authorized non-stormwater discharges will be managed with the stormwater and non-stormwater BMPs described in Section 3 of this SWPPP and will be minimized by the QSP.

Activities at this site that may result in unauthorized non-stormwater discharges include: fuel and/or oil spills from heavy equipment.

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

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

2.8 REQUIRED SITE MAP INFORMATION

The construction project’s Site Map(s) showing the project location, surface water boundaries, geographic features, construction site perimeter and general topography and other requirements are shwon in the plan set. Table 2.5 identifies Map or Sheet Nos. where required elements are illustrated.

Table 2.5 Required Map Information Included on Map/Plan Sheet No. (1)

Required Element

C2 The project’s surrounding area (vicinity) C2 Site layout C2 Construction site boundaries U1 Drainage areas

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Table 2.5 Required Map Information Included on Map/Plan Sheet No. (1)

Required Element

C2/U1 Discharge locations U1 Sampling locations C1-C5 Areas of soil disturbance (temporary or permanent) C1-C5 Active areas of soil disturbance (cut or fill) U1 Locations of runoff BMPs U1 Locations of erosion control BMPs U1 Locations of sediment control BMPs NA Advanced Treatment System (ATS) location (if applicable)

U1 Locations of sensitive habitats, watercourses, or other features which are not to be disturbed

U1 Locations of all post construction BMPs U1 Waste storage areas U1 Vehicle storage areas U1 Material storage areas U1 Entrance and Exits U1 Fueling locations

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

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Section 3 Best Management Practices

3.1 SCHEDULE FOR BMP IMPLEMENTATION

The General Permit recognizes four phases of construction (1)Grading and Land Development Phase, (2)Streets and Utilities Phase, (3) Vertical Construction Phase, and (4)Final Landscaping and Site Stabilization Phase. Each phase has activities that can result in different water quality effects from different water quality pollutants. BMPs for the site are to be implemented and maintained throughout the year on an as-needed basis. BMPs should be implemented in a proactive manner, as appropriate, to protect water quality.

This SWPPP addresses four phases of construction. Table 3.1 describes the major construction activities that are covered by this SWPPP. The sequence of BMP installation activities for each phase is described.

Activities are presented in the order (sequence) they are expected to be completed.

Table 3.1 BMP Implementation Schedule

BMP Implementation Duration

E ro si on

C on tr ol

Scheduling Phase 1 Entirety of Project RECP Phase 1 Entirety of Project

Fiber Rolls Phase 1 Entirety of Project

Streambank Stabilization Phase 1 Entirety of Project

Vegetation Establishment Final Landscaping Entirety of Project

Se di m en t C on tr ol

Silt Fence Phase 1 Entirety of Project Fiber Rolls Phase 1 Entirety of Project

Ditch Checks Phase 1 As needed

Inlet Protection Phase 1, Phase 3 Entirety of Project

T ra ck in g C on tr ol Stabilized Construction Entrance Phase 1 As needed

Street Sweeping Phase 3 As needed

1 See section in General Permit Appendix C for Risk Level 1 or Appendix D for Risk Level 2 16

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. Minimize the areas that are cleared and graded.

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

4. Stabilize inactive areas or areas scheduled to be inactive at the cessation of construction activities.

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

6. 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.

This SWPPP has been designed to meet the requirements of the General Permit:

Implement effective wind erosion control (D.1)1.

Yes Note: (Wind typically not a concern due to dense tree cover)

Provide effective soil cover for inactive area and all finished slopes, open space, utility back fill and complete lots (D.2)1.

Yes N/A

Limit the use of plastic material when more sustainable environmentally friendly alternatives exist (D.3)1.

Specific erosion controls measures to be implemented and maintained at the project site are denoted with an “X” and described below. BMPs shall be implemented in conformance with the following guidelines and in accordance with the BMP Fact Sheets provided in Appendix I. If there is a conflict between documents, the Site Map will prevail over narrative in the body of the SWPPP and over guidance in the BMP Fact Sheets. Site specific details in the Site Map prevail over standard details included in the BMP Fact Sheets. The narrative in the body of the SWPPP prevails over guidance in the BMP Fact Sheets.

1 See section in General Permit Appendix C for Risk Level 1 or Appendix D for Risk Level 2 17

Erosion Controls

Scheduling (EC-1) All BMPs shall be in place year-round. Construction activities shall be planned and performed to minimize the area and duration of exposure of soil to erosion by wind, rain, runoff and vehicle tracking.

The area that can be cleared or graded and left exposed at one time will be limited to the amount of acreage that the Contractor can adequately protect prior to a predicted rainstorm. A predicted storm event is defined as a forecasted 50% chance of rain.

Timing of construction will be considered when scheduling work to minimize soil disturbing activities and major grading operations during the rainy season.

Grading of the site will be phased to minimize the total area of exposed soil and the duration of exposure.

Preserve Existing Vegetation (EC-2)

Existing vegetation will be retained (EC-2) in undisturbed areas to the extent possible. If possible, vegetative buffer strips will be left adjacent to watercourses and along the site perimeter.

Slope Roughening (EC-15)

Slopes will be roughened perpendicular to the direction of runoff by track walking, sheepsfoot rolling, imprinting, or other appropriate technique.

Temporary Soil Stabilization

Blankets (i.e., rolled erosion control products) (EC-7) will be used on disturbed soil areas as a temporary surface cover until soils can be prepared for re-vegetation and permanent vegetation is established. At a minimum, disturbed areas that will remain bare and un-worked for over two weeks. Any hydraulic soil stabilizers applied will include mulch, so that any potential pollutant transport to the storm drain system is visually detectable.

Geotextiles, Plastic Covers, and Erosion Control Blankets, (EC-7)

Erosion control blankets will be placed on critical areas where maximum protection is desirable and on steep slopes that are inaccessible by hydraulic equipment or where other temporary soil stabilization methods are not feasible.

Disturbed areas on the site include the existing parking areas & sidewalks, along the western perimeter where existing culverts will be removed, and along the southern perimeter where new sidewalks and storm sewers will be constructed. Land grading will be performed to minimize erosion and protect vegetation.

Disturbed areas of the construction site that will not be re-disturbed will be stabilized by the day after the last disturbance. Final stabilization for most of the site will occur when pavement is replaced. Final stabilization for the demolished area on the east side will occur when vegetation has reestablished.

Final cut and fill slopes shall be no steeper than 3:1 (horizontal to vertical)). For long slopes, benching may be required to reduce the slope length. Fill slopes shall be constructed in accordance with project specifications.

Graded cut and fill slopes will be roughened with the texture of the roughened surface trending perpendicular to the direction of runoff. The slope will be left in the roughened condition to slow flow velocities, enhance water infiltration, and enhance vegetative growth. Where the slope is too steep to allow construction traffic to travel parallel to the slope, cleated dozers traveling up and down the slope can produce a satisfactory texture on newly compacted soil.

X

X

X

X

X

X

X

1 See section in General Permit Appendix C for Risk Level 1 or Appendix D for Risk Level 2 18

Locations for specific erosion control measures for the project are included in the plan set prepared bd the NPS and contained in Appendix B of this SWPPP.

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.

This SWPPP has been designed to meet the requirements of the General Permit:

Establish and maintain effective perimeter controls and stabilize all construction entrances and exits (E.1)1.

Onsite where sediment basins are used, design sediment basins according to the method provide in the latest update of Fact Sheet SE-2 of the CASQA Construction BMP Hand Book (E.2)1.

Yes N/A (no sediment basins)

Implement appropriate erosion control BMPs in conjunction with sediment control BMPs for areas under active construction (E.3)1.

Yes N/A

Apply linear sediment controls along the toe of the slope, face of the slop and at grade breaks (E.4)1.

Yes N/A

Ensure construction activity to and from the site is limited to entrances and exits that employ effective controls to prevent offsite tracking. (E.5)1.

Yes N/A

Ensure that all storm drain inlets and perimeter controls, runoff control BMPs and pollutant controls at entrances and exits are maintained and protected from activities that reduces their effectiveness. (E.6)1.

Yes N/A

Inspect all access roads daily (E.7)1.

Yes N/A (no access roads)

Specific sediment controls measures to be implemented and maintained at the project site are denoted with an “X” and described below. BMPs shall be implemented in conformance with the following guidelines and in accordance with the BMP Fact Sheets provided in Appendix I. If there is a conflict between documents, the Site Map will prevail over narrative in the body of the SWPPP and over guidance in the BMP Fact Sheets. Site specific details in the Site Map prevail over standard details included in the BMP Fact Sheets. The narrative in the body of the SWPPP prevails over guidance in the BMP Fact Sheets.

X

X

X

X

X

1 See section in General Permit Appendix C for Risk Level 1 or Appendix D for Risk Level 2 19

Sediment Controls

Stabilize Perimeter Before commencing grading or clearing of the site, clearing limits, easements, setbacks, and vegetation to be preserved will be delineated by marking in the field (EC-2) and/or stabilized with non-vegetative controls such as geotextiles (EC-7).

To prevent transport of sediment into existing storm drain inlets and onto adjacent properties and roadways, before grading or clearing, the site perimeter will be stabilized using controls such as silt fences (SE-1); tracking controls such as stabilized construction entrances (TC-1); storm drain inlets will be protected (SE-10) will be constructed.

Silt Fence (SE-1) Temporary silt fences will be constructed and maintained at the toe of exposed and erodible slopes, down slope of exposed soil areas, along the perimeter of the site, or around temporary soil stockpiles to allow sediment to settle from runoff before water leaves the site.

Silt fence shall be properly installed and maintained regularly by the Contractor including but not limited to trenching and keying in the bottom of the silt fence fabric, replacing warn fabric, and providing adequate sediment capacity (i.e., clean when sediment reaches 1/3 of the barrier height). Silt fence is not effective in concentrated flow areas.

Check Dams (SE-4) Check dams will be used (if required) in unlined drainage channels to slow runoff velocity and encourage settlement of sediment.

Fiber Rolls (SE-5) Fiber rolls will be used to reduce flow velocity (as slope interrupters or temporary check dams) and provide some removal of sediment, predominantly along the face or toe of erodible slopes and for perimeter sediment control. Fiber rolls are not appropriate as the only BMP at a site and should be used in conjunction with other erosion and sediment control measures to reduce pollutant discharges and shall be maintained by the Contractor for effective sediment control.

Tracking Controls A stabilized construction entrance will be used (if required) to reduce offsite tracking (TC-1).

All dirt and debris tracked or transported to offsite paved surfaces will be removed at the end of each work day by manual or mechanical sweeping (SE-7).

Storm Drain Inlet Protection (SE-10) All storm drains in the project area and offsite where inlets can receive flow downstream of sediment tracked from the site will be protected with appropriate storm drain inlet protection such as filter fabrics, block and gravel filters, gravel and wire mesh filters, or gravel bag barriers.

Prior to any ground-disturbing activities, including grading, demolition, or vegetation removal, silt fences and/or fiber roll will be placed around the site perimeter. Vegetative buffers will be maintained wherever possible.

Construction entrances and exits will be stabilized with gravel and gravel bags will be placed at all storm drain inlets that could receive runoff from the construction site.

X

X

X

X

X

X

X

1 See section in General Permit Appendix C for Risk Level 1 or Appendix D for Risk Level 2 20

During construction, stormwater runoff shall be directed away from disturbed areas. Properly installed silt fences (SE-1) (with the toe embedded into the soil) shall be used to limit the discharge of sediment and pollutants from the site, as described below.

Perimeter sediment controls, including controls along the physical site perimeter and at active storm drain inlets, and sediment traps, shall be implemented prior to the start of construction and maintained throughout the duration of construction activities. Perimeter sediment controls will include silt fence (SE-1).

Locations for specific sediment control measures for the project are included in the plan set.

The construction site will be managed to minimize the amount of dirt, mud, or dust that is generated and can thus be tracked or blown off the site. The Contractor shall provide a stabilized construction entrance (TC-1) to reduce offsite tracking if required.

3.2.3 Drainage Controls

Drainage controls have been selected and designed to effectively manage all run-on and run-off within the site and all run-off that discharges off the site.

This SWPPP has been designed to meet the requirements of the General Permit:

Run-on from offsite shall be directed away from all disturbed area or shall be collectively in compliance with the effluent limitation in the General Permit (F.1)1.

Specific drainage control measures to be implemented and maintained at the project site are denoted with an “X” and described below. BMPs shall be implemented in conformance with the following guidelines and in accordance with the BMP Fact Sheets provided in Appendix I. If there is a conflict between documents, the Site Map will prevail over narrative in the body of the SWPPP and over guidance in the BMP Fact Sheets. Site specific details in the Site Map prevail over standard details included in the BMP Fact Sheets. The narrative in the body of the SWPPP prevails over guidance in the BMP Fact Sheets.

Earth Dikes, Drainage Swales and Ditches (EC-9) Diversion ditches to prevent run-on from offsite areas will be constructed and maintained.

To prevent the development of rills and gullies in graded slopes, runoff will be directed to stabilized conveyance channels and drains. No concentrated flow of water will be allowed to flow down a graded slope face.

Every effort will be made to maintain runoff water in its natural course and direction of flow. Access road surfaces shall be stabilized (TC-2) and compacted to obtain a dense, smooth and uniform surface for construction vehicles.

Access roads shall be sloped in a manner that will prevent ponding and damage from water flow. Roads that will remain unpaved for more than 21 days will be provided with adequate drainage features to reduce erosion.

Where flow is concentrated into stormwater conveyance systems, they will be designed to reduce scour and erosion. Measures to reduce erosion will include check dams (SE-4).

1 See section in General Permit Appendix C for Risk Level 1 or Appendix D for Risk Level 2 21

Locations for specific drainage control BMPs for the project are included in the plan set

3.3 NON-STORMWATER CONTROLS AND WASTE AND MATERIALS

MANAGEMENT

3.3.1 Non-Stormwater Controls

Non-stormwater management BMPs involve good housekeeping practices to prevent non-stormwater discharges from entering the storm drain and source control of potential pollutants to prevent them from coming into contact with runoff. Categories of non-stormwater management include paving operations management, pesticide and fertilizer management, vehicle and equipment cleaning, fueling, and maintenance, and painting controls. The selection of non-stormwater BMPs is based on the list of construction activities with a potential for non-stormwater discharges identified in Section 2.7 of this

SWPPP.

This SWPPP has been designed to meet the requirements of the General Permit:

Implement good site management measures for Vehicle Storage and Maintenance (B.3)1

Yes N/A

Implement good site management measures for Landscape Materials (B.4)1

Yes N/A

Implement measures to control all non-stormwater discharges (C.1)1

Yes N/A

Shall wash vehicles in such a manner as to prevent non-stormwater discharges to surface waters or MS4 drainage systems (C.2)1

Yes N/A (no on-site washing allowed)

Shall clean streets in such a manner as to prevent unauthorized non-stormwater discharges from reaching surface water or MS4 drainage systems (C.3)1

Yes N/A

Specific non-stormwater measures to be implemented and maintained at the project site are denoted with an “X” and described below. Fact Sheets for temporary non-stormwater BMPs are provided in Appendix I.

Paving and Grinding Operations (NS-3) Saw-cut slurry will be shoveled, vacuumed and removed from site.

Storm drains inlets and manholes will be covered or barricaded and runoff and run-on diverted during saw cutting, paving or grinding operations.

Paving materials and machinery will be stored away from storm drains and water bodies.

Secondary containment will be used to catch drips, leaks or spills where applicable.

Paving will not take place within 72 hours of a predicted storm event or during rainfall.

Excess materials (e.g. asphalt, concrete) will be collected, properly stored, and then disposed upon completion of paving operations.

X

X

X

X

X

X X

X X

1 See section in General Permit Appendix C for Risk Level 1 or Appendix D for Risk Level 2 22

Vehicle and Equipment Fueling (NS-9) and Maintenance (NS-10)

C.O. approval obtained for vehicle fueling

Paving and Grinding Operations

In order to reduce the potential for the transport of pollutants in stormwater runoff from paving operations, paving shall be rescheduled if rain is forecasted. If paving does occur within 72 hours of a storm event, catch basin filters, or other appropriate BMPs will be utilized to trap hydrocarbons.

Any pavement cutting waste, generated by pavement cutting activities, shall be vacuumed up and disposed of immediately (NS-3).

Vehicle Maintenance Vehicles and heavy machinery are a potential source of pollutants such as petroleum products, antifreeze, and exhaust and waste oil containing heavy metals. Pollutants may enter stormwater runoff by means of direct contact with machine parts and by contact with spills on surfaces and the ground. On-site vehicle maintenance is prohibited unless specific provisions to contain and dispose of fluid drips and spills are implemented and approved by C.O. in the SWPPP.

3.3.2 Materials Management and Waste Management

Materials management control practices consist of implementing procedural and structural BMPs for handling, storing and using construction materials to prevent the release of those materials into stormwater discharges. The amount and type of construction materials to be utilized at the Site will depend upon the type of construction and the length of the construction period. The materials may be used continuously, such as fuel for vehicles and equipment, or the materials may be used for a discrete period, such as soil binders for temporary stabilization.

Waste management consist of implementing procedural and structural BMPs for handling, storing and ensuring proper disposal of wastes to prevent the release of those wastes into stormwater discharges.

Materials and waste management pollution control BMPs shall be implemented to minimize stormwater contact with construction materials, wastes and service areas; and to prevent materials and wastes from being discharged offsite. The primary mechanisms for stormwater contact that shall be addressed include:

• Direct contact with precipitation.

• Contact with stormwater run-on and runoff.

• Wind dispersion of loose materials.

• Direct discharge to the storm drain system through spills or dumping.

• Extended contact with some materials and wastes, such as asphalt cold mix and treated wood products, which can leach pollutants into stormwater.

This SWPPP has been designed to meet the requirements of the General Permit:

1 See section in General Permit Appendix C for Risk Level 1 or Appendix D for Risk Level 2 23

Implement good site management measures for Construction Material that could potentially be a threat to water quality if discharge (B.1)1.

Yes N/A

Implement good site management measures for Waste Management (B.2)1.

Specific material management and waste management control measures to be implemented and maintained at the project site are denoted with an “X” and described below. BMPs shall be implemented in conformance with the following guidelines and in accordance with the BMP Fact Sheets provided in Appendix I. If there is a conflict between documents, the Site Map will prevail over narrative in the body of the SWPPP and over guidance in the BMP Fact Sheets. Site specific details in the Site Map prevail over standard details included in the BMP Fact Sheets. The narrative in the body of the SWPPP prevails over guidance in the BMP Fact Sheets.

Materials Delivery and Storage (WM-1)

Designate areas of the construction site for material delivery and storage. Material storage areas will be placed near construction site entrances, away from drain inlets, culverts and surface water bodies.

Designated storage areas will be kept clean and well organized.

Any materials being stored which could release pollutants by wind or runoff transport shall be protected by overhead cover, secondary containment, tarpaulins, or other appropriate method.

Regular inspections of storage areas will be conducted to monitor inventory and check for leaking containers.

Any chemicals, drums or bagged materials not stored in a covered location, will be stored on pallets, and when possible in secondary containment.

Secondary containment will be provided for liquids.

Secondary containment areas will be covered to prevent accumulation of rainwater.

Materials Use (WM-2)

Materials will be used in accordance with manufacturer directions and in a manner to prevent release of pollutants.

An accurate, up-to-date inventory of materials delivered and stored on-site will be kept.

Required: Application of any erodible landscape material will be discontinued 2 days prior to a forecasted rain event or during periods of precipitation.

Stockpile Management (WM-3)

Stockpiles will be covered or protected by soil stabilization measures when not in use and at the end of each day throughout the term of the contract (WM-3).

X

X

X

X

X X

X

X

X

X

X

1 See section in General Permit Appendix C for Risk Level 1 or Appendix D for Risk Level 2 24

Spill Prevention and Control (WM-4)

If a spill were to occur at the site, it will never be cleaned-up by hosing off the area. Dry material spills will never be hosed down or buried.

Any fuel products, lubricating fluids, grease or other products and/or waste released from the Contractor’s vehicles, equipment, or operations shall be collected and disposed of immediately in accordance with State, Federal and local laws.

If the spill has occurred during a rain event, the area will be covered as quickly as possible. The spill will be cleaned up as soon as possible after cessation of rain.

Spill cleanup materials will be stored near potential spill areas (e.g., painting, vehicle maintenance areas).

Solid Waste Management (WM-5)

There will be designated temporary waste storage areas on the site.

The site will be kept clean of litter and waste.

Non-hazardous construction wastes (e.g., vegetation, trash, and construction debris) will be collected from throughout the site regularly and deposited at the designated waste storage areas.

Additional containers and more frequent pickup will be provided during the demolition phase of construction.

When practical, non-hazardous site wastes will be stored within covered, water-tight dumpsters and/or containers that prevent exposure to rain and prevent loss of wastes when it is windy.

All waste materials will be removed from the storage areas by the Contractor or a licensed subcontractor on a weekly basis and disposed or recycled in accordance with all Federal, State, and local regulations.

Dumpsters will not be hosed out on the construction site. Any required dumpster cleaning will be done offsite by the trash hauling contractor.

Any solid waste that accumulates at erosion and sediment control devices will be removed immediately.

Dumpsters shall be closed at the end of every business day and during rain event.

Hazardous Materials Management (WM-1)

Storage of hazardous materials on site will be minimized. Any hazardous materials generated during construction will be containerized and kept closed during work activities.

Hazardous materials will be stored in covered, sealed containers within a bermed storage area.

Lids alone will not be considered adequate cover.

Designate areas of the construction site for hazardous material delivery and storage. Material storage areas will be placed near construction site entrances, away from drain inlets, culverts and surface water bodies.

Designated storage areas will be kept clean and well organized.

The following types of materials will be stored in a covered storage area: fertilizers, herbicides, pesticides, detergents, fuels,…