B09_Amend_0001_B08_Attach_1_SOW_EX_6_Draft_SWPPP_Vol_1_0001.docx

STORMWATER POLLUTION PREVENTION PLAN

VOLUME 1 OF 4: THE SWPPP

SUSANVILLE/DOYLE FIRE STATION

SE CORNER OF US-395 AND DOYLE GRADE ROAD

DOYLE, CALIFORNIA 96109

530-827-2681

RISK LEVEL: 1

WDID NUMBER: X

LEGALLY RESPONSIBLE PERSON:

BUREAU OF LAND MANAGEMENT

FINANCIAL BLVD

RENO, NV 89502

DERECK WILSON

DISTRICT MANAGER

530-224-2100

PREPARED FOR:

BUREAU OF LAND MANAGEMENT

PREPARED BY:

S&B CHRIST CONSULTING, LLC

9555 HILLWOOD DRIVE, SUITE 160

LAS VEGAS, NV 89134

LAURELI WAGNER, QSD

PREPARATION DATE:

JULY 27, 2022

ESTIMATED PROJECT DATES:

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SWPPP│ SUSANVILLE/DOYLE FIRE STATION

TABLE OF CONTENTS 23

TABLE OF CONTENTS

TABLES

VOLUME I APPENDICES

OTHER VOLUMES

See Volume 2 for CASQA Stormwater BMP Handbook Portal: Construction Fact Sheets See Volume 3 for Construction General Permit See Volume 4 for Records and Forms:

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

July 27, 2022

lwagner@sbcc-us.com

Email

LEGALLY RESPONSIBLE PERSON

Either the Legally Responsible Person (LRP) or Approved Signatory must electronically sign, certify, and submit via SMARTS to the SWRCB for Notice of Intent, Changes of Information, Annual Reports, and Notice of Termination. In doing so, the LRP or Approved Signatory is certifying:

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

Bureau of Land Management

Legally Responsible Person

July 27, 2022

AMENDMENT LOG

Name:

QSD#:

Name:

Name:

Name:

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Name:

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SWPPP REQUIREMENTS

INTRODUCTION

This Stormwater Pollution Prevention Plan (SWPPP) is designed to comply with California’s General Permit for Stormwater Discharges Associated with Construction and Land Disturbance Activities (General Permit) Order No. 2009-0009-DWQ as amended in 2010 and 2012 (National Pollutant Discharge Elimination System [NPDES] No. CAS000002) issued by the State Water Resources Control Board (State Water Board). This SWPPP has been prepared with the aid of the 2019 SWPPP Template provided on the California Stormwater Quality Association Stormwater online portal. Site-specific information has been underlined to facilitate review. In accordance with the General Permit, Section XIV, this SWPPP is designed to address the following:

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

· Where not otherwise required to be under a Regional Water Quality Control Board (Regional Water Board) permit, all non-stormwater discharges are identified and either eliminated, controlled, or treated;

· Site 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 and design details, as well as BMP controls, are complete and correct.

The 3-acre Susanville/Doyle Fire Station project comprises approximately 1.7 acres of improvements and is located at the Southwest Corner of US-395 and Doyle Grade Road in Doyle, California. The property is owned by the United States Department of the Interior, Bureau of Land Management (BLM) and is being developed by BLM via contractors listed in SECTION 6. The project’s location is shown on the Site Map in APPENDIX A.

PERMIT REGISTRATION DOCUMENTS

Required Permit Registration Documents (PRDs) shall be submitted to the State Water Board via the Stormwater Multi Application and Report Tracking System (SMARTS) by the Legally Responsible Person (LRP) or Approved Signatory under the direction of the LRP. The project-specific PRDs include:

1. Notice of Intent (NOI);

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

3. Site Map;

4. Annual Fee;

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

6. SWPPP.

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

SWPPP AVAILABILITY AND IMPLEMENTATION

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

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

SWPPP AMENDMENTS

The SWPPP should be revised when:

· There is a General Permit violation.

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

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

Additionally, the SWPPP shall be amended when:

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

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

· When deemed necessary by the Qualified Stormwater Developer (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.

Amendment shall be logged at the front of the SWPPP and certification kept in APPENDIX D. The SWPPP text shall be revised replaced and/or hand annotated as necessary to properly convey the amendment. SWPPP amendments must be made by a QSD.

RETENTION OF RECORDS

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

· Storm water inspection/monitoring reports and;

· Annual Report.

These records shall be available at the Site until construction is complete. Records assisting in the determination of compliance with the General Permit shall be made available within a reasonable time the Regional Water Board, State Water Board, or U.S. Environmental Protection Agency (EPA) upon request. Requests by the Regional Water Board for retention of records for a period longer than three years shall be adhered to.

REQUIRED NON-COMPLIANCE REPORTING

If a General Permit discharge violation occurs, the QSP shall immediately notify the LRP. The LRP shall include information on the violation with the Annual Report. Corrective measures will be implemented immediately following identification of the discharge or written notice of non-compliance from the Regional Water Board. Discharges and corrective actions must be documented and include the following items:

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

· The cause or nature of the notice or order.

· The BMPs deployed before the discharge event, or prior to receiving notice or order.

· The date of deployment and type of 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.

Spills of hazardous materials above the reportable quantity must also be reported in accordance with applicable laws and the project safety and/or environmental plan.

ANNUAL REPORT

The General Permit requires that permittees prepare, certify, and electronically submit an Annual Report no later than September 1 of each year. Reporting requirements are identified in Section XVI of the General Permit. Annual reports will be filed in SMARTS and in accordance with information required by the online forms.

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 (see Section 1.9); 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 logged at the front of the SWPPP and certification of SWPPP amendments are to be kept in APPENDIX D. Updated PRDs submitted electronically via SMARTS can be found in APPENDIX E.

NOTICE OF TERMINATION

A Notice of Termination (NOT) must be submitted electronically by the LRP via SMARTS to terminate coverage under the General Permit. According to the requirements of Section II.D.1 of the General Permit, the following method will be used to satisfy final cover requirements:

· Gravel from existing conditions will be reused onsite; landscaping and landscape diversion area and; flatwork.

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 construction completion. The Regional Water Board will consider a construction site complete when the conditions of the General Permit, Section II.D, have been met. Some of these items include:

· Construction materials and wastes have been disposed of properly;

· The site will not pose any additional sediment discharge risk than it did prior to construction activity;

· All construction related equipment, materials and any temporary BMPs no longer needed are removed from the site, and;

· Post-construction stormwater management measures are installed and a long-term maintenance plan that is designed for a minimum of five years has been developed. Post construction water balance calculations are included in APPENDIX C.

The NOT must demonstrate through photos, Revised Universal Soil Loss Equation (RUSLE) results, or results of testing and analysis that the project meets all of the requirements of Section II.D.1 of the General Permit by one of the following methods:

· 70% final cover method (no computational proof required);

· RUSLE/RUSLE2 method (computational proof required), or;

· Custom method (discharger demonstrates that site complies with final stabilization).

PROJECT INFORMATION

PROJECT AND SITE DESCRIPTION

SITE DESCRIPTION

The 3-acre Susanville/Doyle Fire Station project comprises approximately 1.7 acres of improvements and is located at the Southwest Corner of US-395 and Doyle Grade Road in Doyle, California. Doyle Grade Road borders the project site to the north and Lassen County 361 borders the east. There is undeveloped land to the west of the site and commercial buildings to the south. The project site is accessible via Doyle Drive (Lassen County 361) from the east. The project site is located approximately half a mile west of Long Valley Creek.

The site is generally located at Latitude: 40.026811°, Longitude: -120.104932°, with a mean elevation of 4,275 feet (NAD 83). The project’s overall location map, as well as site maps showing the beginning and ending of the project (at least 3 Site Maps) are included in APPENDIX A.

EXISTING CONDITIONS

As of the initial date of this SWPPP, the project site consists of mostly undeveloped areas on the western portion of the property and mostly developed areas on the eastern portion of the property. The developed areas consist of two buildings (crew quarters and engine bay), a paved parking lot surrounding the buildings, concrete sidewalks, and landscaping that borders the buildings along the west side with trees and vegetation. The western side of the site is roughly graded with gravel and used for heavy equipment parking. There are also a few storage sheds and an office module.

The previous development(s) of the project site are unknown. There are no known historic sources of contamination at the site.

EXISTING DRAINAGE

The project site gently slopes to the east-northeast (gently being defined as 4 to 9%). The elevation of the project site has a mean elevation of 4,275 feet (NAD 83). Surface drainage at the site currently flows to the east-northeast, towards Doyle Drive (Lassen County Road 361) and through some north-south traversing dirt gullies just before Doyle Drive. Stormwater is conveyed through surface runoff. A stormwater conveyance system is not present onsite. Stormwater discharges, from the site, are not considered direct discharges, as defined by the State Water Board into Long Valley Creek. Existing site topography, drainage patterns, and stormwater conveyance systems are shown on the design drawings prepared by S&B Christ Consulting, LLC dated March 17, 2023.

The project discharges to Long Valley Creek that is listed for water quality impairment on the most recent 303(d)-list for:

· Pathogens This receiving water has an “impaired” condition status for drinking water and a “good” condition status for swimming and boating.

GEOLOGY AND GROUNDWATER

Three borings were obtained as part of a geotechnical analysis for the site as shown in Figure 1. The layers to at least two feet below ground surface of each boring are summarized below. Two feet was chosen since cut is not expected to go past two feet.

· Boring 1: Poorly graded clayey silty sand with gravel (SC-SM) to 2.5 feet.

· Boring 2: Well graded gravel (3/4”) to 0.2 feet and poorly graded clayey silty sand with gravel (SC-SM) to 3.8 feet.

· Boring 3: Asphalt concrete (A/C) to 0.4 feet, poorly graded clayey silty sand (SC-SM) to 1.0 feet, sandy silt (ML) to 1.5 feet, and poorly graded clayey silty sand (SC-SM) to 3.5 feet.

The K value in the RUSLE equation was derived based on “poorly graded clayey silty sand with gravel (SC-SM)” from borings 1 and 2, since these are within the area of disturbance. The RUSLE equation is discussed in SECTION 2.4 for sediment risk.

Figure 1 – Geotechnical Boring Locations Reference the Geotechnical Report for Doyle Fire Station prepared by Universal Engineering Services dated March 11, 2022. Groundwater can occur beneath the site at approximately 35 feet below ground surface. The groundwater gradient is expected to flow east-northeast.

PROJECT DESCRIPTION

The project will involve:

· Removal of existing sheds and trailers;

· Construction of a new, 7,860 square feet fire station

· Installation of new equipment and hazmat storage containers

· Relocation of propane tank

· Appurtenant construction includes

· Rigid Portland cement concrete (PCC) pavements;

· A new powered sliding gate with indicator light;

· Designed landscaping and civil flatwork (e.g., sidewalks, curbs and gutters, gravel drive) throughout the site.

Project grading will occur on approximately 1.67 acres (60,000 square feet) of the project out of the 2.94 total acres, which comprises approximately 57% percent of the total area. The limits of grading are shown on C-102 in the design plans, which is included as part of the Site Maps in APPENDIX A. Grading will include both cut and fill activities, with a cut of 66 cubic yards and fill of 2,390 cubic yards, which results in a net fill amount of 2,324 cubic yards needed to be imported during grading activities. Graded materials are expected to be balanced onsite to the greatest extent possible. Soil will be stockpiled within the designated staging area as shown in the Site Maps in APPENDIX A. Construction activities will be phased, as depicted in the Site Maps in APPENDIX A.

DEVELOPED CONDITION

Post construction surface drainage will continue to be directed to the east-northeast as sheet flow and will continue to discharge to the east adjacent Doyle Drive (Lassen County 361) and the north-south traversing dirt gullies prior to this road. A stormwater conveyance system will not be added to the site. However, a landscape diversion area to capture downspout discharge from the new roof of the building will be installed at the southwest corner of the project site.

Post construction drainage patterns and conveyance systems are presented in the Site Maps in APPENDIX A.

PERMITS AND GOVERNING DOCUMENTS

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

· Regional Water Board requirements

· Contract Documents

STORMWATER RUN-ON FROM OFFSITE AREAS

Any run-on to the site is generated by upgradient land uses. The project site is bordered to the north by Doyle Grade Road and bordered to the east by Doyle Drive (Lassen County 361). The Doyle Senior Center is the south adjoining property with 120 feet or more of undeveloped desert buffer between any buildings on the Senior Center to the project site property fence line. A recent brush fire has eliminated vegetation in this undeveloped buffer area. This may potentially result in an increase of run-on to the site from previous fire damage.

The project site is then bordered to the west by an approximate 120-foot undeveloped desert buffer before US-395.

The stormwater runoff drainage area contributing to offsite run-on is estimated to be approximately 6.3 acres. The anticipated runoff coefficients range from 55 and 77 with a weighted value of 68. The anticipated off-site run-on to the project site is estimated to be 1.67 cubic feet per second; calculations are included in APPENDIX B.

The General Permit requires that temporary BMPs be implemented to direct offsite run-on away from disturbed areas through the use of runoff controls. The following BMPs will be implemented: Manufactured Linear Controls. These BMPs will be located along certain perimeter areas of the site and around stockpiles. Reference SECTION 3 for the full discussion on selected BMPs and APPENDIX A for the Site Maps.

FINDINGS OF THE CONSTRUCTION SITE SEDIMENT AND RECEIVING WATER RISK DETERMINATION A construction site risk assessment has been performed for the project and the resultant risk level is Risk Level 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.

Table 1 and Table 2 summarize the sediment and receiving water risk factors and document the sources of information used to derive the factors.

Table 1 – Summary of Sediment Risk

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

Runoff from the project site discharges into north-south traversing dirt gullies prior to the eastern adjacent Doyle Road that discharge into Long Valley Creek and eventually into the Honey Lake. GIS information downloaded from the California Water Boards file transfer page did not note the area being within a high receiving water risk watershed.

Table 2 – Summary of Receiving Water Risk

Overall Receiving Water Risk

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

Risk Level 1 sites are subject to the narrative effluent limitations specified in the General Permit. The narrative effluent limitations require stormwater discharges associated with construction activity to minimize or prevent pollutants in stormwater and authorized non-stormwater through the use of controls, structures, and BMPs. This SWPPP has been prepared to address Risk Level 1 requirements (General Permit Attachment C, provided in VOLUME 3 of this SWPPP).

CONSTRUCTION SCHEDULE

The site sediment risk was determined based on construction taking place between May 1, 2023 and February 1, 2024. Modification or extension of the schedule (start and end dates) may affect risk determination and permit requirements. The LRP shall contact the QSD if the schedule changes during construction to address potential impact to the SWPPP. The estimated schedule for planned work can be found in APPENDIX F.

1. Demolition and Grading;

2. Utilities

3. Vertical Construction and Flatwork

4. Final Stabilization These are the phases used to demonstrate BMP placement in the Site Maps in APPENDIX A.

POTENTIAL CONSTRUCTION ACTIVITY AND POLLUTANT SOURCES

The following 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.

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

· Vehicle and equipment batteries;

· Demolition/removal activities (including clearing and grubbing);

· Building construction (paint, mortar and grout, treated wood, adhesives, etc.);

· Lime;

· Utility work;

· Installation of equipment and components;

· Disinfectant (line flushing);

· Subgrade preparation;

· Raw landscaping materials and wastes (plant materials, seed, fertilizer, etc.);

· General site litter;

· Cement materials associated with PCC concrete operations (including removal, grinding, sawcutting, etc.);

· Erosion control materials and wastes (straw, binding agents, etc.);

· Concrete curing compounds (if used), and

· Wastes associated with portable toilets (if used).

The anticipated activities and associated pollutants were used in SECTION 3 to select the BMPs for the project. Location of anticipated pollutants and associated BMPs are shown on the Site Map in APPENDIX A.

For sampling requirements for non-visible pollutants associated with construction activity please refer to SECTION 7.7.1. For a full and complete list of onsite pollutants, refer to the Safety Data Sheets (SDS), which are retained onsite at the construction trailer.

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.

Authorized non-stormwater discharges that may occur during the course of the project include:

· De-chlorinated potable water sources such as: fire hydrant flushing, irrigation of vegetative erosion control measures, pipe flushing and testing, water to control dust, uncontaminated ground water dewatering.

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:

· Vehicle and equipment cleaning, fueling, and maintenance operations;

· Paving and grinding discharges;

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

· Dust control discharges;

· Concrete discharges;

· Concrete curing discharges;

· Sanitary and septic wastes;

· Chemical leaks and spills of any kind, including but not limited to petroleum, oil, etc., and;

· General litter/trash.

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.

REQUIRED SITE MAP INFORMATION

The construction project’s Site Map(s) showing the project location, surface water boundaries, geographic features, construction site perimeter and general topography and other requirements identified in Attachment B of the General Permit is located in VOLUME 3. The following table identifies Map or Sheet Nos. where required elements are illustrated.

Table 3 – Required Map Information

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

BEST MANAGEMENT PRACTICES

SCHEDULE FOR BMP IMPLEMENTATION

The BMP Implementation Schedule is provided below:

Table 4 – BMP Implementation Schedule

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.

EROSION CONTROL

Erosion control, also referred to as soil stabilization, consists of source control measures that are designed to prevent soil particles from detaching and becoming transported in stormwater runoff. Erosion control BMPs protect the soil surface by covering and/or binding soil particles.

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

1. Preserve existing vegetation where required and when feasible.

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

3. Stabilize non-active areas within 14 days of cessation of construction activities or sooner if stipulated by local requirements.

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

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

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

These temporary erosion control BMPs shall be implemented in conformance with the following guidelines and as outlined in the BMP Factsheets provided in VOLUME 2. If there is a conflict between documents, the Site Map will prevail over narrative in the body of the SWPPP or guidance in the BMP Fact Sheets. Site specific details in the Site Map prevail over standard details included in the Site Map. The narrative in the body of the SWPPP prevails over guidance in the BMP Fact Sheets.

The following indicates the BMPs that shall be implemented to control erosion on the construction site. Selected BMPs are in blue font. Fact Sheets for temporary erosion control BMPs are provided in VOLUME 2.

EC-1 Scheduling The project schedule will show how BMP implementation relates to soil disturbing and re-stabilization practices. The weather forecast will be monitored for rainfall. When rainfall is predicted, the schedule shall be adjusted to allow for the implementation of soil stabilization and sediment controls on any disturbed areas prior to the onset of rain.

EC-2 Preservation of Existing Vegetation Existing vegetation (if any) will be preserved as much as possible.

EC-3 Hydraulic Mulch This BMP is not currently being implemented.

EC-4 Hydroseed This BMP is not currently being implemented.

EC-5 Soil Binders Soil binders will be applied to all inactive disturbed areas and soil stockpiles. An inactive disturbed area is defined as an area that has been disturbed, is not yet stabilized, and work is not scheduled to resume at the area within 14 days. BMPs will be re-applied as needed to maintain effectiveness.

EC-6 Straw Mulch This BMP is not currently being implemented.

EC-7 Geotextiles and Mats Geotextiles will be used in conjunction with soil binders for all inactive disturbed areas and soil stockpiles. An inactive disturbed area is defined as an area that has been disturbed, is not yet stabilized, and work is not scheduled to resume at the area within 14 days. BMPs will be re-applied as needed to maintain effectiveness. Specifically, anchored landscape geotextile is recommended for cover. It is durable and reusable. Plastic materials should be avoided.

EC-8 Wood Mulching This BMP is not currently being implemented.

EC-9 Earth Dike and Drainage Swales This BMP is not currently being implemented.

EC-10 Velocity Dissipation Devices This BMP is not currently being implemented.

EC-11 Slope Drains This BMP is not currently being implemented.

EC-12 Stream bank Stabilization This BMP is not currently being implemented.

EC-14 Compost Blankets This BMP is not currently being implemented.

EC-15 Soil Preparation-Roughening This BMP is not currently being implemented.

EC-16 Non-Vegetated Stabilization Non-vegetated stabilization will be used, which include EC-7 Geotextile and Mats, EC-5 Soil Binders, and gravel mulch. Gravel is a good candidate for stabilization during the project, since it is currently used on the site for pathways/driveways and will be reused onsite for the new improvements. The gravel should be replaced as soon as practicable after grading.

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.

These temporary sediment control BMPs shall be implemented in conformance with the following guidelines and in accordance with the BMP Fact Sheets provided in VOLUME 2. If there is a conflict between documents, the Site Map will prevail over narrative in the body of the SWPPP or guidance in the BMP Fact Sheets. Site specific details in the Site Map prevail over standard details included in the Site Map. The narrative in the body of the SWPPP prevails over guidance in the BMP Fact Sheets.

The following indicates the BMPs that shall be implemented to control sediment on the construction site. Selected BMPs are in blue font. Fact Sheets for temporary sediment control BMPs are provided in VOLUME 2.

SE-1 Silt Fence Silt fences will be permitted for perimeter control and to be placed around temporary spoil areas and stockpiles. It is not necessary to deploy perimeter controls at locations where sediment is unable to leave the project site (such as areas that slope inward).

SE-2 Sediment Basin This BMP is not currently being implemented.

SE-3 Sediment Trap A sediment trap will be used after the new building is erected and prior to final stabilization. This will be intended to act as a temporary collection any flows from the roofing of the new building prior to installation of the permanent landscape diversion area.

SE-4 Check Dams This BMP is not currently being implemented.

SE-5 Fiber Rolls Staked fiber rolls can be used along the perimeter of the project, particularly as temporary control in the areas designated to receive site salvaged boulder edging. It is not necessary to deploy perimeter controls at locations where sediment is unable to leave the project site (such as areas that slope inward).

SE-6 Gravel Bag Berm Gravel bags can be placed as linear control BMPs where fiber rolls cannot provide adequate protection, like uneven terrain. It is not necessary to deploy perimeter controls at locations where sediment is unable to leave the project site (such as areas that slope inward). This BMP is useful due to the existing and projected reuse of gravel onsite. Gravel bags used onsite can be opened and used for final stabilization of proposed gravel pathways if they meet engineer specifications.

SE-7 Street Sweeping The Contractor shall inspect all immediate access roads daily. The Contractor shall remove any sediment or other construction activity related materials that are deposited on the roads by vacuuming or sweeping daily and prior to any rain event.

SE-8 Sandbag Barrier This BMP is not currently being implemented.

SE-9 Straw Bale Barrier This BMP is not currently being implemented.

SE-10 Storm Drain Inlet Protection This BMP is not currently being implemented. There are no known storm drain inlets in the area.

SE-11 ATS

This BMP is not currently being implemented.

SE-12 Manufactured Linear Sediment Controls These are pre-manufactured devices specified and installed for drainage and sediment control on the perimeter of disturbed sites or stockpiles. SE-1 Silt Fencing, SE-5 Fiber Rolls, SE-6 Gravel Bag Berms, and SE-13 Compost Sock and Berms are such controls specified in this Section.

SE-13 Compost Sock and Berm Compost socks and berms are biodegradable filtering structures. It is recommended that these used in lieu of SE-5 Fiber Rolls when possible. These can be cut open and reused during final stabilization as soil amendment for vegetative landscaping, if in accordance with the landscape architect design and specifications. Compost socks allow filtered runoff to pass through, making this an especially good choice for staging areas with vehicles. Compost socks contaminated with chemicals such as petroleum cannot be reused onsite and must be disposed of in accordance with state law. These are recommended over fiber rolls; however, either can be selected for use.

SE-14 Biofilter Bags This BMP is not currently being implemented.

WE-1 Wind Erosion Control This BMP is not currently being implemented.

TC-1 Stabilized Construction Entrance and Exit A stabilized construction entrance is required. Additional stabilized entrances/exits will be constructed as needed. Construction activity traffic to and from the project will be limited to these stabilized construction entrances/exits. This calls for 3 to 6 inch diameter stones using a minimum depth of 12 inches, or as recommended by soils engineer. The current gravel pavement detail in the design plans dated September XX, 2022 call for 4” minimum gravel wear course and 6” aggregate base course compacted to 95% on top of 6” of scarified native soil. Therefore, the stabilized construction entrance can be the final proposed entrance to be installed at the start of construction.

TC-2 Stabilized Construction Roadway This BMP is not currently being implemented.

TC-3 Entrance Outlet Tire Wash This BMP is not currently being implemented.

NON-STORMWATER CONTROLS AND WASTE AND MATERIALS MANAGEMENT

NON-STORMWATER CONTROLS

Non-stormwater discharges into storm drainage systems or waterways, which are not authorized under the General Permit, are prohibited. Non-stormwater discharges for which a separate NPDES permit is required by the local Regional Water Board are prohibited unless coverage under the separate NPDES permit has been obtained for the discharge. 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.

Non-stormwater BMPs shall be implemented in conformance with the following guidelines and in accordance with the BMP Fact Sheets provided in VOLUME 2. If there is a conflict between documents, the Site Map will prevail over narrative in the body of the SWPPP or guidance in the BMP Fact Sheets. Site specific details in the Site Map prevail over standard details included in the Site Map. The narrative in the body of the SWPPP prevails over guidance in the BMP Fact Sheets.

The following indicates the BMPs that shall be implemented to control sediment on the construction site. Selected BMPs are in blue font. Fact Sheets for temporary non-stormwater control BMPs are provided in VOLUME 2.

NS-1 Water Conservation Practices Water equipment will be kept in good working condition. Leaks will be repaired immediately. Vehicles and equipment will not be washed on site. Water will not be used to clean construction areas. Streets will be cleaned in such a manner as to prevent un-authorized non-stormwater discharges from reaching surface waters or drainage systems.

NS-2 Dewatering Operation This BMP is not currently being implemented.

NS-3 Paving and Grinding Operation Plastic material will be placed under paving equipment when not in use to catch drips or leaks. Paving equipment will be parked overnight at the staging area with secondary containment placed underneath. Residue from grinding or removal operations will be picked up by mechanical or manual means and disposed of properly. Following paving operations, the area will be swept and inspected for paving materials.

NS-4 Temporary Stream Crossing This BMP is not currently being implemented.

NS-5 Clear Water Diversion This BMP is not currently being implemented.

NS-6 Illicit Connection/Discharge The site will be inspected before the project commences and regularly during the project for illicit connections or illegal dumping or discharge. If any are found, they will be reported to the QSP, LRP, and contractor’s officer’s representative at the time of discovery.

NS-7 Potable Water/Irrigation When possible, discharges from water line flushing shall be reused for landscaping purposes. Irrigated areas within the construction limits will be inspected for excess watering.

NS-8 Vehicle and Equipment Cleaning Vehicles and equipment will be cleaned off-site. Rinse water, wash waters or wash materials will not be disposed of on any impervious or pervious site surfaces, nor will they be disposed of into the storm drain system or into surface waters.

NS-9 Vehicle and Equipment Fueling Onsite vehicle and equipment fueling should only be used where it is impractical to send vehicles and equipment offsite for fueling. Fueling will only take place at a dedicated level-grade fueling area that will be designated at the project site. The dedicated fueling area will be protected with berms and/or dikes to prevent run-on and runoff and to contain spills. Absorbent spill clean-up materials and spill kits will be available at the dedicated fueling area. Tanks will not be “topped off”. Oil, grease, and fuel will be prevented from leaking to the ground. Fluid and oil leaks will be repaired immediately. All leak wastes will be properly disposed of.

NS-10 Vehicle and Equipment Maintenance Onsite vehicle and equipment maintenance should only be used where it is impractical to send vehicles and equipment offsite for maintenance. Maintenance activities will only take place at a dedicated level-grade maintenance area at the project site. The dedicated maintenance area will be protected with berms and/or dikes to prevent run-on and runoff and to contain spills.

Only minor maintenance, such as adding oil, fluids or lubricants will occur at the project site. Drip pans or secondary containment will be used when maintenance work is performed. Absorbent spill clean-up materials and spill kits will be available at the dedicated maintenance area. Oil, grease, and fuel will be prevented from leaking to the ground. Fluid and oil leaks will be repaired immediately. All leak wastes will be properly disposed of.

NS-11 Pile Driving Operation This BMP is not currently being implemented.

NS-12 Concrete Curing If curing compounds are used, overspray will be avoided. The drift of the curing compound will be minimized by applying the compound close to the concrete surface. An amount of compound that covers the surface but does not allow any runoff of the compound will be applied. Cure water will be directed away from inlets and watercourses to collection areas for proper removal.

NS-13 Concrete Finishing This BMP is not currently being implemented.

NS-14 Material and Equipment Use Over Water This BMP is not currently being implemented.

NS-15 Demolition Removal Adjacent to Water This BMP is not currently being implemented.

NS-16 Temporary Batch Plants This BMP is not currently…