SR36_Phase_2_SWPPP.pdf

STORM WATER POLLUTION PREVENTION PLAN

FOR

California State Route 36 Improvement Project Phase 2

Prepared for:

Federal Highway Administration Central Federal Lands Highway Division

12300 West Dakota Avenue Lakewood, CO 80228

James Herlyck 720.963.3698

Contractor:

Project Address:

California State Route 36 (SR 36) from HUM Milepost (MP) 36.1 to HUM MP 40.5

CA FLAP SR36(13)

Humboldt County

SWPPP Prepared By:

Federal Highway Administration Central Federal Lands Highway Division

12300 West Dakota Avenue Lakewood, CO 80228 Opal Forbes, CPESC

720.963.3431

SWPPP Preparation Date:

February 2015

Estimated Project Dates:

June 2017 – October 2018

Risk Level: 3

WDID No.: 1 12C378135

SR 36 Improvement Project

Table of Contents

Qualified SWPPP Developer

Amendment Log 2

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

7.6.1.1 Routine BMP Inspections

7.6.1.2 Non-Stormwater Discharge Observations

7.6.2 Rain-Event Triggered Observations and Inspections

7.6.2.1 Visual Observations Prior to a Forecasted Qualifying Rain Event

7.6.2.2 BMP Inspections During an Extended Storm Event

7.6.2.3 Visual Observations Following a Qualifying Rain Event

7.6.3 Visual Monitoring Procedures

7.6.4 Visual Monitoring Follow-Up and Reporting

7.6.5 Visual Monitoring Locations

7.7 Water Quality Sampling and Analysis

7.7.1 Non-Visible Pollutants in Stormwater Runoff Discharges

7.7.1.1 Non-Visible Pollutants Sampling Schedule

7.7.1.2 Non-Visible Pollutants Sampling Locations, Collection and Analysis

7.7.1.3 Analytical Constituents

7.7.1.4 Non-Visible Pollutants Data Evaluation and Reporting

7.7.2 pH and Turbidity in Stormwater Runoff Discharges

7.7.2.1 pH and Turbidity Sampling Schedule

7.7.2.2 pH and Turbidity Sampling Locations and Collection

7.7.2.3 Field Parameters and Measurements

7.7.2.4 Data Evaluation and Reporting

7.7.3 Non-Stormwater Discharges

7.7.3.1 Non-Stormwater Sampling Schedule

7.7.3.2 Non-Stormwater Sampling Locations, Collection and Analysis

7.7.3.3 Analytical Constituents

7.7.3.4 Data Evaluation and Reporting

7.7.4 Other Pollutants Required by the Regional Water Quality Control Board

7.7.5 Active Treatment System

7.8 Training of Sampling Personnel

7.9 Sample Collection, Preservation and Delivery

7.9.1 Sample Collection Methods

7.9.1.1 Detailed Grab Sample Collection Procedures for Each Monitoring Site

7.9.2 Field Measurement Methods

7.9.3 Sample Containers and Handling

7.9.4 Forms and Procedures for Documenting 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

7.10.4.1 Field Duplicates

7.10.4.2 Equipment Blanks

7.10.4.3 Field Blanks

7.10.4.4 Travel Blanks

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

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: Construction BMP 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 Date

Opal Forbes, CPESC 4781

QSD Name QSD Certificate Number

FHWA-CFLHD, Stormwater Permits Specialist

Title and Affiliation opal.forbes@dot.gov 720-963-3431

Email Telephone Number

Amendment Log

Project Name/WDID California SR 36 Improvement Project CA FLAP SR36(1)

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#

Section 1 3

Section 1 SWPPP Requirements

1.1 INTRODUCTION

This Stormwater Pollution Prevention Plan (SWPPP) was prepared for construction activities related to roadway improvements of approximatley 4.4 miles of California State Route (SR) 36 from Humboldt County Milepost (HUM MP) 36.1 to HUM MP 40.5 in Humboldt county, California. The project location is shown on the Site Map included in Appendix B.

The proposed road improvments include realigning and widening SR 36 to attain two, 12-foot-wide travel lanes with 4-fot-wide paved shoulders. The project will flatten the existing steep roadway and correct horizontal and vertical curves which do not meet current design standards.

Additional features including slope stabilization measures and drainage improvements are included in the project. The project also includes the creation of a awetland mitigaiton site, east of the project site.

This SWPPP is designed to comply with California’s General Permit for Stormwater Discharges

Associated with Construction and Land Disturbance Activities (General Permit) Order No.

2009-0009-DWQ as amended by Order No. 2010-0014-DWQ and 2012-0006-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.”

Calculations applicable to this project are included in Appendix A.

1.2 GENERAL PERMIT COVERAGE

The Legally Responsible Party (LRP), James Herlyck, 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 12C378135

1.3 SWPPP AVAILABILITY AND IMPLEMENTATION

The SWPPP shall be available at the construction site during working hours (see Project

Specifications for working hours) while construction is occurring and shall be made available

Section 1 4 upon request by a State or Municipal inspector. When the original SWPPP is retained by a Site

Superintendent in a construction vehicle and is not currently at the construction site, current copies of the BMPs and map/drawing will be left at the Project Site 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 under the following conditions:

If there is a General Permit violation. “This General Permit requires dischargers with

NAL exceedances to immediately implement additional BMPs and revise their

Stormwater Pollution Prevention Plans (SWPPPs) accordingly to either prevent pollutants and authorized non-stormwater discharges from contaminating stormwater, or to substantially reduce the pollutants to levels consistently below the

NALs or NELs.” (General Permit Section I Part H No. 57 and 59)

When there is a reduction or increase in total disturbed acreage. “Within 30 days of a reduction or increase in total disturbed acreage, the discharger shall electronically file revisions to the PRDs that include: … SWPPP revisions, as appropriate …”

(General Permit Section II Part C)

BMPs do not meet the objectives of reducing or eliminating pollutants in stormwater discharges. “Within two business days (48 hours) after each qualifying rain event, dischargers shall conduct post rain event visual observations (inspections) to (1) identify whether BMPs were adequately designed, implemented, and effective, and (2) identify additional BMPs and revise the SWPPP accordingly”. (General Permit, Attachment C, D, or E part I.3.G).

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 QSD has determined that the changes listed in Table 1.1 can be field determined by the QSP. All other changes shall be made by the QSD as formal amendments to the SWPPP.

The following items shall be included in each amendment:

Who requested the amendment;

The location of proposed change;

The reason for change;

The original BMP proposed, if any; and

Section 1 5

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 require 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

Changes to access points (entrance/exits)

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

(2) * Requires Contracting Officer approval

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 is 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 Lahontan Regional

Water Quality Control Boards (RWQCB). Any instances of non-compliance with the

Section 1 6 requirements of the General Permit must be reported within 48 hours of detection of the non-compliance. Discharges and corrective actions will be documented on the Inspection and

Monitoring Forms in Appendix J.

The report 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 must be completed by September 1 of each year until a NOT has been filed in the SWRCB’s SMARTS database. The Contractor is responsible for submitting the Annual

Report information to the Contracting Officer’s Representative by August 1 of each year for the reporting year of July 1 – June 30. Contractor’s Data Submitter shall enter and upload requisite

Annual Report information into SMARTS for review and approval by the Contracting Officer’s

Representative. The Contracting Officer’s Representative will review the report information for completeness and accuracy by September 1 of each year. An Annual Report form is available in

Appendix E for Contractor’s reference.

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 and 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 shall be kept in Appendix F.

1.9 PROJECT CLOSE OUT

The Contractor will contact the Owner within 60 days of project completion. In order to submit the Notice of Termination (NOT), the Contractor will provide the Owner a copy of the SWPPP, Section 1 7 approved implemented SWPPP Site Maps, all documents per Annual Reporting (Section 1.7) submittal requirements, and required photographic evidence showing that the site is ready for filing of the NOT. To terminate coverage under the General Permit, a NOT must be filed in the

SWRCBs’ SMARTS database. The NOT will be submitted when the following conditions 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.

The Contracting Officer’s Representative prepares and submits the NOT.

Section 2 8

Section 2 Project Information

2.1 PROJECT AND SITE DESCRIPTION

2.1.1 Site Description

This Stormwater Pollution Prevention Plan (SWPPP) was prepared for construction activities related to roadway improvements of approximatley 4.4 miles of California State Route (SR) 36 from Humboldt County Milepost (HUM MP) 36.1 to HUM MP 40.5 in Humboldt county, California. The entire project scope comprises approximately 80 acres. The existing impervious area is 15.5 acres (19%) of the total area.

The project begins at approximately 40.453°, -123.654° (HUM MP 36.1) and terminates at approximately 40.489°, -123.627° (HUM MP 40.5).

The project area is characterized by dense forests, steep terrain, and the smal, rural and unincorporated towns of Bridgeville and Dinsmore in Humboldt County. The project is adjacent to the Van Duzen and the Little Van Duzen Rivers.

The project is located in the North Coast Region, which consists of all basins draining into the

Pacific Pcean from the California-Oregon State line to the southerly boundary of the watershed of the Estero de San Antonio and Stemple Creek in Martain and Sonoma counties. The poroject area is located within th eEel River Basin, the Van Duzen watershed, as well as the Upper Van

Duzen River sub-basin. The Van Duzen River watershed is appproximately 367 square miles and contains 808 miles of streams throughout Humboldt County.

The project location is shown on the Water Pollution Control Drawings included in Appendix B.

2.1.2 Existing Conditions

The project area is a mix of paved roadway with little to no shoulders and wooded slopes. The terrain is steep and forrested, with several reural residences scattered throughout. The area is highly mountainous with elevations approaching 5,900 feet in neighboring areas.

Any historic sources of contamination are described in Section 2.1.4.

2.1.3 Existing Drainage

The project site is within a relatively mountainous area.

Surface drainage generally flows overland, off of the existing roadway and into roadside ditches.

Culverts varying in size carry water under the roadway in numerous areas. Seeps, springs, wetlands, roadside swales and streams were all identified within the project are.

Existing site drainage patterns and storm water conveyance systems are shown on Water

Pollution Control Drawings in Appendix B.

2.1.4 Historic Sources of Contamination

This site has no historical sources of contamination.

The site is currently a roadway, and will continue to function as such after the project is completed.

Section 2 9

2.1.5 Geology and Groundwater

Project area soils are generally well drained sandy clays, based on information received from the

USDA Natural Resources Conservation Service Web Soil Survey.

Maintenance and stability issues are ongoing due to the roadway’s location in an active landslide area. Landslides have had considerable impacts and require ongoing maintenance.

2.1.6 Project Description

The project consists of the improvements of 4.4 miles of California State Route 36 (SR36).

Proposed improvements include realigning and widening SR36 to attain two 12-foot-wide travel lanes with 4-foot-wide paved shoulders. In addition, new signing, pavement delineation, and the accquisitoin of new right of wary are included in the project. The limits of work are shown on

Water Pollution Control Drawings in Appendix B. Soils, aggregate materials, and other project materials will be stockpiled as shown on Water Pollution Control Drawings in Appendix B.

2.1.7 Developed Condition

Post construction surface drainage will continue in the same manner as in existing conditions.

Drainage will shed off of the roadway into the adjacent roadside ditches and will be conveyed within the ditches to the new and existing road cross culverts.

2.1.8 Construction Quantities

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

SMARTS.

Table 2.1 Construction Site Estimates

Construction site area 85 acres

Disturbed Area 66.5 acres

Percent impervious before construction 40 %

Runoff coefficient before construction 0.756*

Percent impervious after construction 49 %

Runoff coefficient after construction 0.768*

*Runoff coefficient calculated in SMARTS

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 – North Coast Region

Basin Plan Requirements

Section 2 10

Contract Documents

2.3 STORMWATER RUN-ON FROM OFFSITE AREAS

The project area is within a relatively mountainous area. However, run-on will be captured in existing roadside ditches and will be conveyed through existing culverts as in existing conditions.

2.4 SEDIMENT AND RECEIVING WATER RISK DETERMINATION

A construction site risk assessment has been performed for the project and the resultant risk level for the overall project is Risk Level 3.

The risk level value for K and LS were populated in SMARTS. The risk level R value was calculated per EPA methods and is based on project duration, location, proximity to impaired receiving waters and soil conditions. A copy of the Risk Level calculations to assist in determination for submittal on SMARTS with the PRDs is included in Appendix A.

Table 2.2 summarizes the sediment and receiving water risk factors and document the sources of information used to derive the factors for the Region within which the project lies.

Table 2.2 Summary of Sediment Risk – North Coast Region (1)

RUSLE

Factor Value Method for establishing value

R 240 Calculated per EPA methods

K 0.28 Populated in SMARTS

LS 10.26 Populated in SMARTS

Total Predicted Sediment Loss (tons/acre) Answer: 689.47 tons/acre

Overall Sediment Risk

Low Sediment Risk < 15 tons/ acre

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

High Sediment Risk >= 75 tons/acre

Low

Medium

High

Receiving water risk for the site is shown as HIGH per the SMARTS website, resulting in a combined risk factor of 3. Thus, the SWPPP reflects a site risk factor of 3.

The Van Duzen River is currently listed on the 2010 CWA Section 303(d) List for Water Quality

Impairments. The Van Duzen River is listed for Sedimentation/Siltation and has an approved

TMDL.

Also, the Van Duzen River is currently listed as having beneficial uses including Municipal and

Domestic Supply (MUN), Agricultural Supply (AGR), Water Contact Recreation (REC-1), Non-

Water Contact Recreation (REC-2), Commercial and Sportfishing (COMM), Spauwning, Reproduction, and Development (SPWN), Wildlife Habitiat (WILD), Aquaculture (AQUA), Cold Water Habitat (COLD), Industrial Service Supply (IND), Migration of Aquatic Organisms

(MIGR), and Rare, Threatened or Endangered Species (RARE) (Water Quality Control Plan for the Noth Coast Region by California Regional Water Quality Control Board, North Coast

Region, Amended December 2005).

Section 2 11

Risk Level 3 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 3 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 3 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 Septermber

2016 and November 2018. Modification or extension of the schedule (start and end dates) may affect risk determination and permit requirements. The Contractor shall contact the Contracting

Officer’s Representative or LRP and the QSD immediately if the schedule changes and the

Contracting Officer’s Representative or 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 Construction Activity Milestones*

Milestone Start Date End Date

Date PRDs and filing fee submitted to SWRCB. Nov 2016

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

September

November

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

Nov 2016

Implement erosion control measures Nov 2016

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

Nov 2016

Grading/excavation/trenching activities. May 2017

Paving activities. TBD TBD

Construction of structures and paved surfaces. TBD TBD

Site clean-up. TBD

Anticipated construction completion date.

November

Anticipated filing of Notice of Termination (NOT).

November

Section 2 12

*All dates approximate

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 are used in Section 3 to select the BMPs for the project. Location of anticipated pollutants and associated BMPs are show on the Water

Pollution Control Drawings 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 to be retained onsite at the construction trailer.

2.7 IDENTIFICATION OF NON-STORMWATER DISCHARGES

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

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

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

Water for dust control

Groundwater and stormwater dewatering

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:

Paving and Grinding Operations

Vehicle and equipment wash water, including concrete washout water

Slurries from concrete cutting and coring operations, PCC grinding or AC grinding operations

Slurries from concrete or mortar mixing operations

Runoff from dust control applications of water or dst palliatives

Sanitary and septic wastes

Chemical leaks and/or spills.

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

Section 2 13

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 Water Pollution Control Drawings showing the project location, surface water boundaries, geographic features, construction site perimeter and general topography and other requirements identified in Attachment B of the General Permit are located in Appendix B. Table 2.5 identifies the required elements illustrated.

Table 2.5 Required Map Information

Included on

WPCD

Required Element

The project’s surrounding area (vicinity)

Site layout

Construction site boundaries

Drainage areas

Discharge locations

TBD in field Sampling locations

Areas of soil disturbance (temporary or permanent)

Active areas of soil disturbance (cut or fill)

Locations of runoff BMPs

Locations of erosion control BMPs

Locations of sediment control BMPs

N/A Advanced Treatment System (ATS) location (if applicable)

N/A Locations of sensitive habitats, watercourses, or other features which are not to be disturbed

Locations of all post construction BMPs

Waste storage areas

TBD in field Vehicle storage areas

Material storage areas

TBD in field Entrance and Exits

TBD in field Fueling locations

Section 3 14

Section 3 Best Management Practices

3.1 SCHEDULE FOR BMP IMPLEMENTATION

The General Permit recognizes four general 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. This SWPPP addresses all applicable phases of construction, namely Phase 2 and Phase 4; Phases 1 and 3 are expected to not be applicable to this project.

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. The WPCD in Appendix B illustrates general requirements for implementation of

BMPs. However, the Contractor’s QSD may be required to prepare updated WPCDs as contruction progresses between phases.

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.

Table 3.1 BMP Implementation Schedule

BMP Implementation Duration

E ro si o n

C o n tr o l

Scheduling Prior to Construction Entirety of Project

Preserve existing vegetation Throughout Construction Entirety of Project

Seed, Hydroseed (Final Stabilization) Where indicated on

Contract Drawings

At the completion of grading

Hydromulch Where indicated on

Contract Drawings

At the completion of grading

S ed im en t C o n tr o l

Silt Fence Prior to construction Entirety of Project

Fiber Roll / Sediment Log In conjunction with construction Entirety of Project

Sediment Trap In conjunction with construction Entirety of Project

Check Dam In conjunction with construction Entirety of Project

T ra ck in g

C o n tr o l

Street Sweeping Start of Construction As needed

W in d

E ro si o n

Wind Erosion Control Start of Construction Entirety of Project

Section 3 15

Table 3.1 BMP Implementation Schedule

BMP Implementation Duration

3.2 EROSION AND SEDIMENT CONTROL

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

3.2.1 Erosion Control

Erosion control, also referred to as soil stabilization, consists of source control measures that are designed to prevent soil particles from detaching and becoming transported in stormwater runoff.

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

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

1. Preserve existing vegetation where required and when feasible.

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

3. Stabilize non-active areas within 14 days of cessation of construction activities.

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

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

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

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

Implement effective wind erosion control (D.1).

Yes N/A

Provide effective soil cover for inactive area and all finished slopes, open space, and utility backfill (D.2).

Yes N/A

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

Yes N/A

Specific erosion controls measures to be implemented and maintained at the project site are denoted with an “” and described below. BMPs shall be implemented in conformance with the

Section 3 16 following guidelines and in accordance with the BMP Fact Sheets provided in Appendix I. If there is a conflict between documents, the WPCDs will prevail over narrative in the body of the

SWPPP and over guidance in the BMP Fact Sheets. Site specific details in the WPCDs 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.

Section 3 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.

Temporary Soil Stabilization

Temporary vegetation, temporary seeding, and/or hydromulch will be used on disturbed soil areas as a temporary surface cover until soils can be prepared for gravel cover and/or re-vegetation and permanent vegetation is established. (EC-3, EC-4)

Dust Control

Wind Erosion Controls (WE-1) shall be provided to prevent of alleviate dust generated by construction activities. Care will be taken to prevent over-watering, which may result in runoff or erosion.

Construction roads will be stabilized to prevent tracking of sediments. (TC-2)

The project does anticpate some grading activities, such as the improving roadway safety, improving drainage and clear and grub operations at the road shoulders. All BMPs shall be in place in the areas of work prior to ground disturbance.

Construction activities shall be scheduled and performed to minimize the area and duration of exposure of soil to erosion by wind, rain, runoff and vehicle tracking (EC-1). The area that can be cleared or graded and left exposed at one time is 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 ½-inch of rain. Timing of construction shall be considered when scheduling work to minimize soil-disturbing activities and major grading operations during the rainy season.

The following erosion controls will be implemented at the project construction site:

Section 3 18

Vegetation will be preserved to the maximum extent practicable (EC-2). Only areas necessary for construction will be disturbed, cleared, or graded. Areas of vegetation to be protected will be clearly designated as no disturbance areas on the plans, and flagged in the field to exclude construction vehicles. Specific shrubs and trees to be preserved should be clearly marked.

Disturbed areas on the site include removal of existing asphalt cover, clearing and grubbing at the road shoulders, and selective tree removal. Land clearing will be performed to minimize erosion and protect vegetation. Stabilization measures will be placed immediately and will include placement of seed, hydroseed (EC-4), hydromulch (EC-3), and/or permanent gravel cover where indicated in the Contract Drawings. At no time will the site remain disturbed but not stabilized or disturbed but not re-disturbed for 14 calendar days or longer.

Fill slopes shall be constructed in accordance with project specifications.

Wind Erosion Control measures (WE-1) will be used to stabilize soil from wind erosion, and reduce dust generated by construction activities including grading, demolition and travel on unpaved temporary roads. Dust control shall be provided daily or more often by the application of water. Care shall be taken to prevent over-watering, which may result in runoff or erosion.

If water is required to comply with Permit requirements, care will be taken to spray additional areas of exposed soil as necessary during windy periods. Only the minimum amount of water will be used; no runoff will result from this practice.

Locations for specific erosion control measures for the project are included on the Water

Pollution Control Drawings 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).

Yes N/A

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).

Yes N/A Though site is comprised of more than 5 acres, the scope of work is primarily in-place milling and reconstruction of existing roadway;

grading is limited.

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

Yes N/A

Apply linear sediment controls along the toe of the slope, face of the slope and at grade breaks

(E.4).

Section 3 19

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).

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).

Yes N/A

Inspect all access roads daily (E.7).

Yes N/A

Specific sediment controls measures to be implemented and maintained at the project site are denoted with an “” 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 Water Pollution Control Drawings will prevail over narrative in the body of the SWPPP and over guidance in the BMP Fact Sheets. Site specific details in the WPCDs 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.

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 (SE-1, EC-2) and/or stabilized with non-vegetative controls such as geotextiles (EC-7) [N/A], riprap or gabions (wire mesh boxes filled with rock), and mulches such as straw (EC-6) [N/A].

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 fiber rolls / sediment logs (SE-5) or gravel bag berms (SE-6); tracking controls such as stabilized construction entrances (TC-1) [N/A]; storm drain inlets will be protected (SE-

10); and sediment traps (if applicable) (SE-3) will be constructed.

Sediment Traps (SE-3)

If needed to comply with Construction General Permit. Temporary sediment traps (temporary basin with a controlled release structure) will be used to reduce sediment prior to entering the storm drain, and around and/or up-slope from storm drain inlet protection measures. [N/A]

Section 3 20

Fiber Rolls (SE-5)

Fiber rolls (sediment logs) 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.

Gravel bag berms (SE-6)

Gravel bag berms will be used to reduce flow velocity (as slope interrupters or temporary check dams) and provide some removal of sediment. [N/A]

Gravel bag barriers will be used for perimeter site control or along streams or channels or around stockpiles to intercept sediment laden sheet flow or moderately concentrated flows.

Tracking Controls

A stabilized construction entrance will be used to reduce offsite tracking (TC-1). [N/A]

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).

A wheel wash will be used if offsite tracking cannot be controlled by a stabilized entrance and sweeping (TC-3). [N/A]

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, perimeter protection will be applied. For areas where work is limited to road resurfacing, perimeter protection will be placed as the Work area becomes active. Silt fence or fiber roll traps will be located at outlets, to be determined in the field. For areas in which Work includes grading, a sediment log barrier will be placed around the site perimeter, unless a silt fence is used. Inlet protection will be placed at all storm drain inlets that could receive runoff from the construction site. Vegetative buffers will be maintained wherever possible.

During construction, stormwater runoff shall be directed away from disturbed areas. Properly installed perimeter controls shall be used to limit the discharge of sediment and pollutants from the site, as described below.

Temporary sediment logs, and if necesarry sediment traps, or equivalent measures will be installed along the downhill boundary of the construction site. It is anticipated that the majority of the site will be provided with silt fence and sediment logs.

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.

Section 3 21

Locations for specific sediment control measures for the project are included on the Water

Pollution Control Drawings contained in Appendix B of this SWPPP.

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. Because construction is to occur over an existing paved surface, a stabilized construction entrance (TC-1) and wheel wash (TC-3) are not expected to be required. However, Contractor shall monitor the project vicinity at all times and all dirt and/or debris tracked or transported to offsite paved surfaces shall be removed at the end of each workday by hand sweeping or mechanized sweeper. Washing of sediment from the right-of-way shall be prohibited.

Locations for specific tracking control BMPs for the project are included on the Water Pollution

Control Drawings contained in Appendix B of this SWPPP.

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).

Yes N/A

Specific drainage control measures to be implemented and maintained at the project site are denoted with an “” 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.

Outlet Protection (EC-10)

Runoff velocities, both on slopes and at discharge points, will be retarded to prevent erosion.

[N/A]

Rock outlet protection (i.e. rip rap) will be placed at pipe outlets where deemed necessary to prevent scour and reduce the velocity and/or energy of exiting stormwater flows.

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.

Where flow is concentrated into stormwater conveyance systems, they will be designed to reduce scour and erosion. Measures to reduce erosion will include sediment log check dams.

Locations for specific drainage control BMPs for the project are included on the Water Pollution

Control Drawings contained in Appendix B of this SWPPP.

Section 3 22

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).

Yes N/A

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

Yes N/A

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

Yes N/A Wash vehicles at appropriate off-site locations.

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

Yes N/A

Specific non-stormwater measures to be implemented and maintained at the project site are denoted with an “” 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 / culverts 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 24 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…