100__NCOA_SWPPP_rev01-31-2017_(No_Appendix).pdf

Stormwater Pollution Prevention Plan (SWPPP)

NCOA, Fort Drum, NY 01/31/2017

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TABLE OF CONTENTS

1.1 INTRODUCTION

A. Location

B. Project Description

C. Scope of Work

D. Phasing of Construction Disturbance

2.1 EROSION AND SEDIMENT CONTROLS

A. Sequence of Construction

B. Pollution Prevention Measures

C. Construction Erosion and Sediment Controls

D. Best Management Practices

E. Spill Prevention Practices

F. Inspection and Maintenance

3.1 EXISTING TOPOGRAPHY AND SOIL DATA

A. Site Topography

B. Soil Classification

C. Receiving Waters

D. Flood Plains

E. State Wetlands

F. Federal Wetlands

4.1 STORMWATER CONDITIONS AND ANALYSIS

A. Rainfall Data and Sizing Criteria

B. Hydrologic and Hydraulic Analysis

C. Runoff Reduction/Green Infrastructure

D. Pre and Post Development Stormwater Comparison

E. Cold Climate Considerations

F. Stormwater Management Summary / Conclusion

5.1 INSPECTION AND MAINTENANCE REQUIREMENTS

A. General Construction Site Inspection and Maintenance Requirements

B. Owner or Operator Inspection Requirements

C. Qualified Inspector Inspection Requirements

6.1 TERMINATION OF PERMIT COVERAGE

A. Termination of Coverage

7.1 POST CONSTRUCTION MAINTENANCE

A. Maintenance

APPENDICES

APPENDIX A: SWPPP CERTIFICATIONS

APPENDIX B: CONSTRUCTION SITE LOG BOOK

APPENDIX C: SITE PLANS

APPENDIX D: PRE- AND POST-DEVELOPMENT DRAINAGE AREA MAPS

APPENDIX E: STORMWATER CALCULATIONS & LID BMP, EISA COMPLIANCE

(ANNEX C, D, AND E OPORD 16-012) FORMS

APPENDIX F: PRE-DEVELOPMENT HYDROGRAPHS (HYDRAFLOW)

APPENDIX G: POST-DEVELOPMENT HYDROGRAPHS (HYDRAFLOW)

APPENDIX H: STORM SEWER DESIGN (HYDRAFLOW)

APPENDIX I: SPDES GENERAL PERMIT (GP-0-15-002)

APPENDIX J: NOTICE OF INTENT

APPENDIX K: NOTICE OF TERMINATION

APPENDIX L: INFILTRATION TEST RESULTS

APPENDIX M: GEOTECHNICAL INVESTIGATION REPORT

1.1 INTRODUCTION

A. Stormwater Pollution Prevention Plan Background

This Stormwater Pollution Prevention Plan (SWPPP) has been prepared to comply with the State Pollution Discharge Elimination System (SPDES) General Permit No.

GP-0-15-002, the New York State Standards and Specifications for Erosion and

Sediment Control and the New York State Stormwater Management Design Manual.

A Notice of Intent (NOI) is required to be submitted to the New York State Department of Conservation (NYS DEC) to obtain coverage under the SPDES permit.

Construction activities that include soil disturbance of one or more acres of land are required by the New York State Pollution Discharge Elimination System (SPDES) General Permit No. GP-0-15-002 to prepare a Stormwater Pollution Prevention Plan (SWPPP). The purpose of the SWPPP is to identify potential sources of pollution, which may reasonably be expected to affect the quality of stormwater discharges from the construction site. The SWPPP will describe the erosion and sediment control measures used to reduce pollutants in stormwater discharges from the construction site and prevent potential stormwater impacts to any downstream areas.

In addition, the SWPPP includes a detailed explanation of all Stormwater Management Practices (SMPs), activities or structural improvements that help maintain existing drainage patterns to the extent practical, reduce the quantity and improve the quality of stormwater runoff at the project site.

The prime contractor and subcontractors performing any construction activities that include soil disturbance will be responsible to implement measures outlined in this

SWPPP. The contractor(s) must provide and sign a certification that they understand and agree to comply with the terms and conditions of the SWPPP (see Appendix A for

SWPPP Certifications).

B. Project Location

The Non-Commissioned Officers Academy (NCOA) Complex project is located on the

Fort Drum Military Installation (South Post), in Jefferson County, NY on George Street, NYS Plane 1475868.10 North, 1039574.21 East (Longitude W 75.749, Latitude N 44.047). The project site is bounded by George Street to the north and east; moderate to dense woodlands to the south and west.

The project scope will also include the demolition of 20 buildings that are located approximately 4,000 feet southwest of the proposed NCOA Complex. The existing buildings are located on 5th Street M and Lewis Avenue, NYS Plane 1471987.22

North, 1038219.41 East (Longitude W 44.037, Latitude N 75.754). The demolition site is bounded by Oswego Avenue to the north; 5th Street E to the east; Nash Boulevard to the south; and an unnamed access driveway to the west.

See Figures 1A and 1B for the site vicinity and location maps. See Figures 1C and

Figure 1D for enlarged views of the NCOA Project Site (Area A) and the Building Demolition Site (Area B).

FIGURE 1A. VICINITY MAP

FIGURE 1B. SITE LOCATION MAP

FIGURE 1C. NCOA PROJECT SITE (AREA A)

FIGURE 1D. BUILDING DEMOLITION SITE (AREA B)

C. Project Description

The Non-Commissioned Officers Academy (NCOA) Complex project includes construction of a new two-story, 25,820 SF building that will include barracks, a training room, an auditorium, classrooms, and administration offices. Site construction elements associated with the NCOA Complex include:

• Clearing and grubbing of an existing wooded area.

• Demolition of an existing asphalt paved parking lot and gravel pavements.

• A lawn/snow equipment storage building located northwest of the NCOA

Building

• A fire pump house located southeast of the NCOA Building.

• A 58,028 SF POV parking lot located on the east side of George Street. In total, 158 parking spaces are being constructed, six (6) of which are ADA accessible, and eight (8) carpool spaces.

• An 8 lane, ¼ mile asphalt paved running track

• Concrete sidewalks for pedestrian circulation between NCOA and the POV parking lots.

• A 20-ft wide gravel fire access drive.

• Gravel pads for future bleachers (NIC).

• 6,437 SF asphalt paved support equipment staging area.

• A 6” sanitary sewer service lateral extends from the building and ties into a new sanitary sewer manhole. From this new manhole, a new 8” sanitary sewer gravity main is provided. The new 8” gravity main connects to an existing sanitary sewer manhole located near the existing pump house to the northeast.

Three (3) additional manholes will be constructed along the gravity main.

• An 8” water main is provided for the facility. The 8” main will extend from the existing 8” water main along George Street to the fire pump house. Separate lines for 8” fire service and 4” domestic water service extends from the fire pump house and connects to the building services just outside of the mechanical room.

• Other site improvements include underground electrical service, communication service, and gas service.

• Storm drainage inlets and piping.

• An infiltration trench to the east of the 91 space parking lot.

• An infiltration trench to the south of the 67 space parking lot.

• An infiltration trench and dry swale adjacent to the track.

• Dry wells located in the front and rear lawns of the facility.

• An infiltration basin south of the emergency vehicle access road.

• Demolition of 20 existing off-site buildings.

D. Scope of Work

The NCOA Complex SWPPP includes the following:

• An Erosion and Sediment Control (ESC) Plan for on-site project construction.

The ESC Plan includes applicable erosion and sediment control practices to be installed or implemented to minimize the discharge of pollutants and prevent a violation of the water quality standards.

• A drainage evaluation of the existing and proposed conditions within the project drainage area.

• The project includes the addition of new impervious surfaces that will require water quality treatment and water quality control of the associated runoff and appropriate erosion controls.

• The project includes off-site areas that drain across the site. Off-site area will be routed to bypass stormwater management facilities where possible. Where offsite areas cannot be routed to bypass the stormwater management facilities the areas will be treated in accordance with NYS DEC Stormwater Management requirements.

• Off-site demolition of 20 existing buildings that will require erosion and sediment controls. The existing buildings are located approximately 4,000 feet south of the NCOA Complex site.

• A Stormwater Management Plan that includes stormwater management practices to treat and control stormwater runoff from the project site.

• Hydrologic modeling for the pre and post construction conditions.

• Water quality treatment calculations and design for the required Water Quality Volume (WQV) and Runoff Reduction Volume (RRv).

• Stormwater quantity control calculations and design for channel protection

(Cpv) for the 1-year, 24-hour design storm, overbank flood control (Qp) of the

10-year, 24-hour design storm, and extreme flood control (Qf) of the 100-year design storm.

• Hydraulic modeling for the proposed storm sewer systems for the 10-year design storm using the Rational Method.

E. Land Disturbance Phasing

The project construction area includes approximately 18.3 acres of land disturbance (of which 4.6 acres consists of the building demolition site). Construction activities will be phased in such a manner to limit the total area of land disturbance at any one time to <5 acres. Construction areas are anticipated to overlap at times while work progresses and areas are stabilized. The phases outlined below illustrate a viable sequence of work. The contractor may elect to vary this sequence or combination of phases, but shall limit the area of disturbance to less than 5 acres at a time. Each phase of work shall be stabilized prior to proceeding to the next phase of work. The following construction disturbance phases are divided into three stages of erosion and sediment control planning: (1) initial stage, (2) intermediate stage, and (3) final stage erosion.

Phase 1 construction activities consists of approximately 4.99 acres of land disturbance. Disturbance in this area is associated with the Construction Staging Area, fire access drive, the NCOA Building, POV parking lot to the north, the front lawn and sidewalks. Phase 1 activities include:

Initial Stage

• Establishment of construction trailers, offices, and staging area.

• Installation of two construction entrances for vehicular access to the site.

• Installation of perimeter erosion and sediment controls, such as silt fence.

Refer to Appendix C for the Erosion and Sediment Control Plan – Initial Phase

(Sheet C-710).

• Removal of ground cover and topsoil.

• Clearing and grubbing.

• Demolition of asphalt and gravel pavements and other site improvements designated to be demolished within this phase as depicted on the Existing

Conditions and Demolition Plan (Sheet C-101).

Intermediate Stage

• Site grading and earthwork.

• Start NCOA building construction.

• Installation of storm sewer pipes and structures.

• Installation of intermediate erosion and sediment controls, including but not limited to, earth dikes, catch basin sediment traps, excavated drip inlet protection, stone outlet protection, rolled erosion control products for slope stabilization, stone check dams, temporary seeding, mulching, and dust control. Refer to Appendix C for the Erosion and Sediment Control Plan –

Intermediate Phase (Sheet C-711).

• Installation of site utilities including water line service, sanitary sewer service, gas, electric, and communication services.

• Construction of base course for asphalt and concrete pavements.

• Construct Equipment Building.

Final Stage

• Installation of asphalt and concrete pavements.

• Construction of sidewalks.

• Installation of final erosion and sediment control measures including permanent seeding and riprap outlet protection. Refer to Appendix C for the Erosion and Sediment Control Plan – Final Phase (Sheet C-712)

• After all upstream areas have been stabilized construct stormwater management practices (i.e. Infiltration Trench 1, Dry Well 1, and the Infiltration

Basin).

• Removal of temporary erosion and sediment control measures upon final stabilization of upstream areas.

Phase 2 construction activities consists of approximately 4.02 acres of land disturbance.

Disturbance in this area is associated with the entrance drive and POV parking lot to the northeast and the bypass swale to that runs along the perimeter of the site from the northeast to the southwest. Phase 2 activities include:

• Installation of the third construction entrance for vehicular access to the site.

• Installation of perimeter erosion and sediment controls, such as silt fence and tree protection fence. Refer to Appendix C for the Erosion and Sediment

Control Plan – Initial Phase (Sheet C-710).

• Removal of ground cover and topsoil.

• Clearing and grubbing of the wooded area up to the limits of disturbance.

• Demolition of gravel trails.

• Construction of drainage swales.

• Installation of intermediate erosion and sediment controls, including but not limited to, earth dikes, stone outlet sediment traps, rolled erosion control products for slope stabilization, stone check dams, temporary seeding, mulching, surface roughing, level spreader and dust control. Refer to Appendix

C for the Erosion and Sediment Control Plan – Intermediate Phase (Sheet C-

711).

• Preparation of pavement subgrades, and construction of base course for asphalt and concrete pavements.

• Preparation of fire access drive subgrade and construction of gravel drive.

• Installation of asphalt and concrete pavements.

• Construction of Sidewalks.

• Installation of final erosion and sediment control measures including permanent seeding and riprap outlet protection. Refer to Appendix C for the Erosion and

Sediment Control Plan – Final Phase (Sheet C-712).

• After all upstream areas have been stabilized construct stormwater management practices (i.e. Infiltration Trench 1 and 2.)

Phase 3 construction activities consists of approximately 4.62 acres of land disturbance.

Disturbance in this area is associated with the rear lawn and running track area. Phase 3 activities include:

• Installation of perimeter erosion and sediment controls, such as silt fence and tree protection fence. Refer to Appendix C for the Erosion and Sediment

Control Plan – Initial Phase (Sheet C-710)

• Removal of ground cover and topsoil.

• Clearing and grubbing of the wooded area up to the limits of disturbance.

Intermediate Phase

• Installation of storm sewer pipes and structures.

• Installation of intermediate erosion and sediment controls, including but not limited to, earth dikes, stone outlet sediment traps, rolled erosion control products for slope stabilization, stone check dams, temporary seeding, mulching, surface roughing, level spreader and dust control. Refer to Appendix

C for Erosion and Sediment Control Plan – Intermediate Phase (Sheet C-711).

• Construction of the fire pump house.

• Installation of site utilities including water line service, sanitary sewer service, gas, electric, and communication services.

• Preparation of asphalt track subgrade, and construction of asphalt track base course.

• Preparation of synthetic turf subgrade.

• Construction of asphalt track.

• Installation of synthetic turf.

• Installation of final erosion and sediment control measures including permanent seeding and riprap outlet protection. Refer to Appendix C for the Erosion and

Sediment Control Plan – Final Phase (Sheet C-712).

• After all upstream areas have been stabilized construct stormwater management practices (i.e. Infiltration Trench 1 and 2.)

• After all upstream areas have been stabilized construct stormwater management practices (i.e. Infiltration Trench 3.)

Phase 4 construction activities consist of approximately 4.7 acres of off-site land disturbance. Disturbance in this area is associated with the demolition of 20 buildings located near the intersections of Lewis Avenue and Fifth Street East and West. Phase 4 activities include:

• Installation of construction entrances.

• Installation of perimeter erosion and sediment controls, such as silt fence and tree protection fence where required. Refer to Appendix C for Erosion and

Sediment Control Plan – Initial Phase (Building Demolition Site), Sheet C-720.

• Disconnection of all utilities connected to the 20 buildings to be demolished.

Utilities shall be cut and capped at the main and the remaining lines shall be abandoned in place.

• Demolition of 20 existing buildings and associated sidewalks.

• Backfilling depressed areas resulting from demolition operations.

• Installation of final erosion and sediment control measures including topsoiling, permanent seeding, and topsoiling. Refer to Appendix C for the Erosion and

Sediment Control Plan – Final Phase (Building Demolition Site), Sheet C-721.

2.1 EROSION AND SEDIMENT CONTROLS

A. General

A copy of the approved Erosion and Sediment Control (ESC) Plans and SWPPP will be maintained on the site at all times.

Prior to commencing land disturbing activities in areas other than indicated on the ESC plans, the Contractor shall submit a supplementary ESC plan to Fort Drum for review and approval by the plan approving authority.

The Contractor will be responsible for the installation and maintenance of any additional control measures necessary to protect water quality and to prevent erosion and sedimentation as determined necessary by the plan approving authority at no additional cost to the owner.

B. Structural Practices

Temporary Practices

Perimeter Swale (PD): Perimeter swales are temporary ridges of soil excavated from an adjoin swale located along the perimeter of the site or disturbed area. Perimeter swales will be used to prevent off-site runoff from entering a disturbed area and to prevent sediment-laden stormwater from leaving the construction site or disturbed area.

Earth Dike: Earth dikes are temporary berms of compacted soil, located in such a manner as to channel water to a desired location. Earth dikes will be used to direct runoff to sediment trapping devices and to divert offsite runoff away from disturbed areas.

Silt Fence (SF): Silt fence will serve as a perimeter control to protect disturbed areas from off-site runoff and to prevent sedimentation damage to areas outside the project site. Silt fence shall be located along on the downstream side of the project site.

Stone Check Dam: Stone check dams will be used to reduce erosion in a drainage channel by restricting the velocity of flow in the channel.

Excavated Drop Inlet Protection: Storm drain inlet protection is a temporary, somewhat permeable barrier, installed around inlets and used to prevent heavily sediment laden water from entering the storm drainage system through inlets.

Sediment Traps: Sediment traps area temporary sediment control devices formed by excavation and/or embankment to intercept sediment laden runoff and retain sediment. Catch basin sediment traps and/or stone outlet sediment traps will be at storm drain inlets during construction.

Dust Control (DC): Dust control will be used to prevent surface and air movement of dust from exposed soil surfaces.

Surface Roughing: Surface roughing consists of creating horizontal grooves across a slope, stair stepping, or tracking with construction equipment to aid the establishment of vegetative cover from seed, to reduce runoff velocity and increase infiltration, and to reduce erosion and provide for trapping of sediment.

Stabilized Construction Access: Stabilized construction access will be used to reduce or eliminate the tracking of sediment onto roads or streets.

Permanent Practices

Level Spreader: The level spreader will be used to convert concentrated flow to sheet flow and release it uniformly over a stabilized area.

Riprap Outlet Protection: Riprap outlet protection will be placed at the outlet end of pipes and channels to reduce the depth, velocity, and energy of water, such that the flow will not erode the receiving downstream reach.

C. Vegetative Practices

Temporary Practices

Temporary Seeding (TS): Temporary seeding will be used to provide temporary protective cover to denuded areas where final grade is complete, when preparing for winter work shutdown, or to provide cover when permanent seedings are likely to fail due to mid-summer heat or drought.

Rolled Erosion Control Products (RECP): Rolled erosion control products will be used to protect slopes by resisting flow and aiding vegetative growth.

Tree Protection Fence (TPF): Tree protection fence will be used to preserve existing vegetation. Protective fence will be installed adjacent to wooded areas.

Mulch (M): Mulch will be used to provide initial erosion control while seeding is established. Mulch will conserve the moisture and modify the surface soil temperature and reduce fluctuation of both. Mulch is also used alone for temporary stabilization in non-growing months.

Permanent Practices

Topsoiling (TP): Topsoiling will be used to provide acceptable plant cover growing conditions thereby reducing erosion; to reduce irrigation water needs; and to reduce the need for nitrogen fertilizer application.

Permanent Seeding (PS): Permanent seeding is used to reduce erosion and sediment transport. Permanent seeding will be applied to all denuded areas within 14 days after completion of land disturbing activities.

D. Sequence of Construction

Work areas will be limited to a maximum of five acres of land disturbance at any one time. Additionally, temporary stabilization must be placed over areas in which construction activities have ceased, or where activities are anticipated to cease for more than 14 days.

NCOA Complex Project Site

1. Construction will begin with the proper installation and placement of erosion and sediment control measures. At a minimum, this includes the installation of a stabilized construction entrance, silt fence, tree protection fence, check dams, construction fence, etc.

2. Following the proper placement of erosion and sediment control measures, clearing of remaining vegetation, grubbing, topsoil removal, and grading activities will commence.

3. Construction staging and stockpile areas will be established. Staging and contractor parking should be sited as indicated on the plans. Stockpiles shall be protected by silt fence and appropriate erosion control practices. Maintain adequate separation from drainage channels.

4. Initial grading and earthwork activities will include the establishment of temporary and permanent drainage channels intended to direct runoff away from work areas, and maintain positive drainage. To minimize the potential for erosion, runoff diversion shall include the channeling of runoff to temporary basins, slope protection, check dam installation, etc. Stormwater swales will need to be rough graded to establish a drainage route.

5. Earthwork for site grading and building foundation excavation shall begin following the removal and stockpiling of topsoil. Cut and fill earthwork activities will progress in stages beginning with:

a) parking lot and construction staging and access,

b) building area construction and utility installation,

c) construct infiltration practices (i.e. dry well, infiltration basin and infiltration trenches)

6. The stormwater management areas to include the dry well areas, infiltration basins, and infiltration trenches shall be protected from heavy construction equipment and disturbance activities during building and site construction.

Infiltration practices shall be constructed only after the site has been permanently stabilized and vegetation has been established.

7. Construction of the building area will take place following earthwork fill activities.

8. On-site utility installation will progress in conjunction with earthwork fill operations.

9. As on-site utility construction proceeds, areas completed will be rough graded and temporarily stabilized.

10. The entire disturbed areas, which are not paved, concrete, stone or contain buildings will have soils restored, seeded and stabilized as lawn areas.

11. Upon completion of earthwork, installation of hard surface areas, and the establishment of lawn areas, the stormwater infiltration basin area will be excavated, rough graded, inspection risers installed, topsoil placed, and area seeded and permanently restored.

Building Demolition Site

12. Upon completion of construction of the NCOA Building, begin installation and placement of erosion and sediment control measures at the building demolition site. At a minimum, this includes the installation of a stabilized construction entrance, silt fence, tree protection fence (where needed), construction fence, etc.

13. Following the proper placement of erosion and sediment control measures, demolition activities will commence.

14. Construction staging and stockpile areas will be established. Staging and contractor parking shall be sited to utilize the existing paved surfaces to remain.

15. Utilities to the existing buildings shall be disconnected, cut and capped at the mains, and abandoned in place.

16. Hazardous materials shall be identified and removed from the buildings prior to demolition.

17. Building demolition shall follow hazardous waste removal and asbestos abatement. Mulching and temporary seeding shall be provided in areas that will be left exposed for more than 14 days.

18. Backfill depressions resulting from removal of subsurface structures such as footings, foundations, underground utilities, etc. Ensure positive drainage is provided to existing drainage features.

19. Disturbed areas will have soils restored, seeded and stabilized as lawn areas.

Final Stabilization

20. Upon final stabilization of both sites and establishment of a minimum of 80% grass growth, any sediment buildup within areas to be used for infiltration practices and storm drainage system shall be removed to design elevations.

21. When final stabilization has been achieved in all areas of disturbance; all temporary, structural erosion and sediment control measures have been removed; and all post-construction stormwater management practices have been constructed in conformance with this SWPPP and are operational, a Notice of Intent (NOT) shall be prepared and submitted to Fort Drum for review and approval before final submission to the NYS DEC.

E. Pollution Prevention Measures

Stormwater runoff on the project site may be exposed to pollutants that result from demolition, excavation, and construction materials. Potential areas of concern include all disturbed areas. The following common construction materials and substances are potential pollutant sources and may be present onsite during construction:

� Concrete/Additives/Wastes

� Detergents

� Paints/Solvents

� Acids

� Sanitary Wastes

� Cleaning Solvents

� Petroleum Based Products

� Pesticides

� Solid and Construction Wastes

� Soil Stabilization Additives

The following are the material management practices used to reduce the risk of spills or other accidental exposure of materials and substances to stormwater runoff. The job site superintendent will be responsible for ensuring that these procedures are followed.

1. Materials Storage and Disposal

a. Designate areas of the construction site for material delivery and storage. Place near construction entrances, away from waterways, and avoid transport near drainage paths or waterways.

b. Use materials only where and when needed to complete construction activity.

c. All materials stored onsite will be stored in a neat, orderly manner and, if possible, under a roof or in a containment area. At a minimum, all containers will be stored with lids on when not in use. Drip pans shall be provided for all dispensers.

d. Products will be kept in their original containers with the original manufacturer’s label in legible condition.

e. Follow manufacturer’s or local/state/federal recommended methods for proper use, protective equipment, ventilation, flammability and mixing of chemicals.

f. Material Safety Data Sheets (MSDS’s) for each substance with hazardous properties that is used on the job site will be obtained and used for the proper management of potential wastes that may result from these products. MSDS’s will be posted in the immediate area where such products are stored and/or used.

g. All hazardous waste materials will be disposed of by the contractor in the manner specified by local, state, and/or federal regulations and by the manufacturer of such products.

h. Machinery left on site unattended and/or at night will be parked away from drainage channels.

2. Solid and Construction Wastes

All waste materials will be collected and stored in a secure, covered, metal dumpster rented from a local waste management company, which must be a solid waste management company licensed to do business in New York State.

The dumpster will comply with all local and state solid waste regulations.

All trash and construction debris from the site will be deposited in the dumpster.

The dumpster will be emptied once per week or more often if necessary, and the trash will be hauled to a landfill approved by New York State. No construction waste materials will be buried on site.

All waste dumpsters and roll-off containers will be located in an area where the likelihood of the containers contributing to stormwater discharges is negligible.

If required, additional BMPs must be implemented, such as sandbags around the base, to prevent wastes from contributing to stormwater discharges.

3. Sanitary Waste

All sanitary waste will be collected from the portable units a minimum of once per week by a licensed portable facility provider, in compliance with local and state regulation.

All sanitary waste units will be located in areas where the likelihood of the containers contributing to stormwater discharges is negligible. If required, additional BMPs must be implemented, such as sandbags around the base, to prevent wastes from contributing to stormwater discharges.

4. Concrete Washout and Cement Waste

Wastewater from washout of concrete shall not be allowed to discharge from the site. Direct concrete wash water into a leak-proof container or leak-proof settling basin that is designed so that no overflows can occur due to inadequate sizing or precipitation. Hardened concrete wastes shall be removed and disposed of in a manner consistent with the handling of other construction wastes.

5. Excavated Materials Storage

Excavated areas will be backfilled and compacted the day of excavation. The majority of material excavated for utility work will be backfilled in the trench immediately after the pipe is installed and all required inspections and tests have been performed.

Any earthwork material to be removed from the site will be separated to satisfactory and unsatisfactory soil materials and satisfactory material shall be used as backfill material. All unsatisfactory material shall be loaded into a dump truck and hauled to a NYSDEC acceptable fill disposal location. Excess excavated material is not anticipated.

6. Landscaping Operations

Maintain as much existing vegetation as practicable. Apply permanent or temporary stabilization or mulching to denuded areas in accordance with the erosion and sediment control specifications and the SPDES general permit for stormwater discharges from construction activities. Apply nutrients in accordance with manufacture’s recommendations and not during rainfall events.

C. Construction of Erosion and Sediment Controls

1. Erosion and Sediment Control Practices

Erosion and sediment control installation will begin prior to the start of any earthwork activities. Silt fence shall be installed to prevent sedimentation damage to areas outside the project site. Silt fence shall also be installed along the down slope of planned earthwork activities and shall be at least 10 feet from the toe of slope to allow for maintenance. Primary silt fence locations are where there is the potential for runoff to leave the site or impact downstream waterways.

Three stabilized construction access points will be provided. Two stabilized construction entrances will be located to the north/northeast that connects to George Street and one to the west that connects to an existing gravel drive.

During trench excavation, a temporary low point will be created and any runoff will be contained within these areas. Extreme care should be taken to protect the down slope ends of these excavations in the event of a rainstorm. Protection should include silt fence along the lower portions of the excavation to prevent overflowing sediment from reaching the natural drainage channels. However, these protection measures are expected to be only short term as the excavation will be initially backfilled the same day. Backfilling will not only prevent erosion of the underlying soils should a storm occur after working hours, but also provide for a safer project site.

Stone check dams shall be placed along and/or within the drainage channels to filter and contain any sediment that may runoff. Stone check dams shall be placed at the entrance to all headwalls and inlet protection shall be placed around drop inlets for additional protection from siltation and further movement of sediment downstream. Rock outlet protection shall be placed at the discharge ends of all outlet pipes. Perimeter swales will be provided adjacent to George Street and along perimeter of the project site from the east/northeast to southwest. Earth dikes shall be provided adjacent to the perimeter swales to the north (adjacent to George Avenue) and to the northeast/east to route runoff to sediment traps or stabilized areas. A level spreader will be provided at the outlet of the perimeter channel that runs along the east and south sides of the project site.

Sediment traps shall be installed at all inlets to reduce the potential of sediment from entering the storm sewer. Sediment shall be removed and the trap restored to original dimensions when the sediment has accumulated half the design depth of the trap. Sediment removed from the trap shall be deposited in a protected area and in such a manner that it will not erode.

Dust control shall be provided to minimize health hazards, off-site damage, and traffic safety problems by implementing vegetative cover in disturbed areas not subject to traffic, mulch, rolled erosion control blankets, or spraying traffic areas with water.

All silt fence, stone check dams, inlet protection, and sediment traps shall remain in place and be maintained until construction activity in the area is complete and vegetation is established.

The total project disturbance area is 18.2 acres (of which 4.6 acres consists of the building demolition site). Work areas will be limited to a maximum of 5 acres of disturbance at any one time. Temporary or permanent stabilization will be placed prior to progressing work into the next area. Additionally, temporary stabilization will be placed over areas in which construction activities have ceased, or plan to be ceased for more than 14 days. Permanent stabilization will be provided following the placement of the asphalt and concrete and establishment of vegetation along the project area which may have been disturbed by construction operations.

An ESC Plan has been prepared in accordance with the NYS DEC, New York

State Standards and Specifications for Erosion and Sediment Control, dated

August 2005. (See Appendix C). ESC measures aim to minimize erosion from land disturbing activities and deter sediment from leaving the site and entering water bodies.

2. Erosion and Sediment Control Construction Planning

Step 1: Pre-Construction Actions

Stabilized Construction Entrance

• Establish a temporary construction entrance to capture mud and debris from construction vehicles before they enter the public highway.

• Stabilize bare areas (entrances, construction routes, equipment-parking areas) immediately as work takes place. Top these areas with gravel or maintain vegetative cover.

• Sediment tracked onto streets should be removed or cleaned on a daily basis. Sediment shall be removed from the road by shoveling or sweeping and transported to a sediment control disposal area. Street washing shall be allowed only after sediment is removed in this manner.

Perimeter Sediment Controls

• Install silt fences based on appropriate spacing intervals. Decrease this interval as the slope increases. Silt fence should be placed on or parallel to contours where there is no concentration of water flowing to the silt fence and where erosion occurs in the form of sheet erosion.

The area below the silt fence should be undisturbed ground.

• Install additional silt fences and barriers as needed during grading.

• Install silt fences, at the toe of slope, surrounding all soil stockpiles.

• Install tree protection fence adjacent to wooded areas.

Step 2: Runoff and Drainage Control

Runoff Control

• Install temporary swales to prevent runoff from entering disturbed areas and to divert sediment laden water along the base of slopes to a trapping device.

• Install inlet sediment traps to capture sediment before it enters the storm sewer system.

Runoff Conveyance System

• Swales must be seeded at the outlet points.

• Install check dams to slow down the velocity of concentrated flow.

Outlet Stabilization

• Install rock outlet protection to prevent erosion at discharge points.

• Install level spreaders at the outlet of channels that discharge onto stabilized areas.

Step 3: Grading

• Limit the initial clearing and earth disturbance to that necessary to install sediment control measures. Excavation for utilities, footings, clearing, or other earth disturbance may only take place after the sediment and erosion controls are installed.

• Stockpile the topsoil removed from the site. The topsoil should be protected, stabilized and sited in a location away from the storm drains and water bodies.

• As grading continues, soil restoration shall be performed in all areas impacted by construction that will not be impervious surfaces. Soil restoration includes the loosening and decompaction of over compacted subgrade and topsoil to promote infiltration and plant root growth, and reduce runoff.

Step 4: Erosion Control (Stabilization)

Temporary Stabilization

• Temporary seeding or mulching or other appropriate measure shall be used on areas that will be exposed for more than 14 days.

• Stabilization should be completed immediately for the surface of all perimeter controls and perimeter slopes.

• Following initial soil disturbance or re-disturbance, permanent or temporary, stabilization should be completed within 14 days or as soon as possible.

• In areas where soil disturbance activity has temporarily ceased, the application of soil stabilization measures must be initiated by the end of the next business day and completed within 14 days from the date the current soil disturbance activity ceased.

• Excavated areas will be initially backfilled and compacted the same day as excavation.

Permanent Stabilization

• Permanent stabilization should be performed as soon as possible after completion of grading and prior to the installation of infiltration practices.

• All other erosion and sediment control measures remain in place until the pavements are placed, topsoil, seeding and mulching is complete and grass is fully established in all areas disturbed by construction activities.

Step 5: Sediment Control

• At any location where surface runoff from disturbed or graded areas may flow off the construction area, sediment control measures must be installed to prevent sediment from being transported off site.

No grading, filling or other disturbance is allowed within existing drainage swales.

• The site is to drain to sediment-trapping controls at all times during land disturbing activities and site development until final stabilization is achieved.

• Swales or other areas that transport concentrated flow should be appropriately stabilized.

• The contractor shall monitor and take precautions to control dust, including (but not limited to) use of water or polymer additives;

vegetative cover; mulch; limiting the number of vehicles allowed on-site, minimizing the operating speed of all vehicles; etc.

• Conduct ongoing inspections and maintenance of erosion and sediment controls.

Step 6: Finalize Grading & Landscaping

• All open areas, including borrow and spoil areas must be stabilized.

• Permanent top soil, seed, sod, mulch, riprap or other stabilization practices must be placed in the remaining disturbed areas as appropriate.

• Stabilization must be undertaken no later than 14 days after construction activity has ceased except as noted in the GP-0-15-002.

• Remove the temporary control measures.

Step 7: Post Construction Controls

• Any disturbed areas will be stabilized and vegetation established.

• The infiltration trenches and basin will be dredged of all sediment above design elevations and stabilized according to the plans and specifications.

D. Best Management Practices

1. Equipment cleaning, maintenance, and repair will be conducted in designated areas protected by berms.

2. Sediment and erosion controls will be checked weekly by a qualified professional for sediment build-up and failure. The controls will be cleaned at the discretion of the qualified professional responsible for the stormwater inspections. See Section

F for additional inspection and maintenance requirements.

3. Cleared brush, debris, gravel, stone, and soils will be stockpiled up slope from and protected by erosion and sedimentation controls.

4. Materials brought on-site shall be in the minimum quantities required.

5. All materials brought on-site will be stored in a neat, orderly manner in their appropriate containers, and if possible, under a roof or other enclosure.

6. Products will be kept in their original containers with the original manufacturer’s labels and material safety data sheets retained.

7. Substances will not be mixed with one another unless recommended by the manufacturer.

8. Whenever possible, the entire product will be used up before the container disposal. Recycle empty containers as applicable.

9. Manufacturer’s recommendations for proper use and disposal shall be followed.

10. The contractor shall prohibit washing of tools, equipment and machinery in or 100 feet of any watercourse or wetland.

11. All above grade storage tanks are to be protected from vehicle damage by temporary barriers.

E. Spill Prevention Practices

The following practices will be followed for spill prevention and cleanup. The site contractor responsible for the day-to-day site operations will be the spill prevention and cleanup coordinator. The Coordinator will designate at least one other site personnel who will receive spill prevention and cleanup training. These individuals will each become responsible for a particular phase of prevention and cleanup. The names of responsible spill personnel will be posted in the material storage area and in the on-site construction office or trailer.

1. Manufacturers’ recommended methods for spill cleanup will be clearly posted and site personnel will be made aware of the procedures and the location of the information and cleanup supplies. All spills are reportable to the Fort

Drum Fire Department and Project Contracting Officer’s Representative

(COR). Fort Drum Public Works Environmental Staff will provide notification to the NYS Department of Environmental Conservation (NYS DEC) as necessary. Notification must be completed within two hours of the discovery of the spill as required by law.

2. Materials and equipment necessary for spill cleanup will be kept in the material storage area on-site. Equipment and materials will include but not limited to absorbent pads, brooms, dust pans, mops, rags, gloves, goggles, activated clay, sand, sawdust, and plastic and metal trash containers specifically for this purpose.

3. All spills will be cleaned up immediately after discovery.

4. The spill area will be kept well ventilated and personnel will wear appropriate protective clothing to prevent injury from contact with a spilled substance.

5. Spills of toxic or hazardous material will be reported to the appropriate

State or local government agency, regardless of size.

6. Concrete trucks will not be allowed to wash out or discharge surplus concrete or drum wash water on-site, except in approved areas.

7. Asphalt trucks shall not discharge surplus asphalt on-site, except in areas specified by the COR.

F. Inspection and Maintenance

Inspections by qualified personnel must be conducted in all the areas of the site disturbed by construction activity and areas used for storage of materials that are exposed to stormwater. Inspections shall be conducted as follows:

• Trained contractor shall inspect the erosion and sediment control practices and pollution prevention measures being implemented within the active work area daily to ensure that they are being maintained in effective operation condition at all times. If deficiencies are identified, the contractor shall being implementing corrective actions within one (1) business day and shall complete the corrective actions in a reasonable time frame. The trained contractor cannot conduct the qualified inspector site inspections unless they meet the qualified inspector qualifications.

• The qualified site inspector, as defined by SPDES Permit GP-0-15-002, shall conduct a site inspection at least once every seven (7) calendar days. The qualified inspector shall inspect all erosion and sediment control practices and pollution prevention measures to ensure integrity and effectiveness, all post-construction stormwater management practices under construction to ensure that they are constructed in conformance with this SWPPP and Erosion and Sediment Control Plans, all areas of disturbance that have not achieved final stabilization, all points of discharge to natural surface water bodies located within or immediately adjacent to, the property boundaries of the construction site, and all points of discharge from the construction site. The qualified inspector shall prepare an inspection report subsequent to each and every inspection. See Appendix A for the Construction Duration

Inspection form.

At a minimum the following installations shall be inspected in accordance with the Erosion and Sediment Control Plans to identify maintenance needs, and to evaluate the effectiveness of the practice in minimizing sediment discharge, including whether the control has been inappropriately or incorrectly used:

• Trenches should be backfilled the same day as excavation.

• Silt fence, stone check dams, eroded channels, etc. should be inspected and repaired a minimum of every 7 calendar days and within 24 hours after periods of rainfalls greater than 0.5 inch.

• Sediment buildup at silt fences, check dams and inlet protection should be removed when buildup reaches 2-inches or more.

• Sediment buildup at any sediment traps should be removed whenever their capacity has been reduced by fifty percent of the design capacity.

• Buildup of sand and debris in ditches and low areas should be checked and removed annually to provide maximum available flow capacity and minimize transport of sediments.

• Grass areas surrounding maneuvering areas should be maintained to slow runoff and the transport of sediments.

• Buildup of sand and debris within the pretreatment and treatment areas of the sand filters and basin should be checked annually each spring.

• Sediment should be cleaned when buildup reaches one inch or when water ponds on the surface for more than 48 hours.

Major observations to note during inspections include the following:

• Practices are adequately operational and maintained properly;

• Sediment build up at all control structures;

• Evidence of the soil erosion on the site;

• Potential of pollutants entering drainage systems;

• Problems at discharge points (such as turbidity in receiving water);

• Signs of soil and mud transport from the site to the public road at the entrance;

• Corrective actions, including any changes to the SWPPP, that are necessary with implementation dates;

• Identify any pollutant generating activity not identified in the pollution prevention plan.

3.1 EXISTING TOPOGRAPHY AND SOIL DATA

A. Site Topography

The proposed NCOA Complex and building demolition sites are located within the controlled perimeter of the “South Post” area of Fort Drum. Following are descriptions of site boundaries, land cover, and elevation ranges for each site.

NCOA Complex Project Site

The proposed NCOA Complex project site is located along the south/southwest side of George Avenue, opposite its intersection with Jones Street. The project site is bounded by George Avenue to the north/northeast and a newly constructed lift station to the north. The remaining sides of the site abut moderate to dense woodlands. The project site consists mostly of an open area with ground cover consisting of scrub grass and a sparse stand of trees to the north and of moderate to dense woodlands to the south. The site also contains an existing lift station, an asphalt parking lot, gravel trails, and a number of utilities that crosses the site. Slopes in this area range from moderate to steep, with surface elevations ranging from 647’ at George Avenue to the northeast/east to 630’ at the west near gravel road. The primary site drainage path is from the northeast/east to the west of the site by overland flow and shallow concentrated flow. There are no existing drainage structures located within the vicinity of the site. Stormwater runoff generally drains to the low point near the gravel road to the west.

Building Demolition Site

The building demolition site is located adjacent to Lewis Avenue between the intersections of 5th Street East and 5th Street West. The site is bounded by open grass areas and pavements to the north; 5th Street to the east; Nash Boulevard to the south; and an asphalt access drive, parking lots and open grass areas to the east.

The site consists of 20 existing buildings, asphalt and gravel driveways, asphalt and gravel parking lots, open grass areas, and underground utilities that connect to each building. According to Base GIS data, slopes in this area are very flat, with surface elevations ranging from 654’ to 652’. The site appears to drain from Oswego

Avenue, to the north, to Lewis Avenue, to the south, and into an existing storm sewer system located…