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Stormwater ManagementWhen is it Needed and Why?

Required if not naturally internallydrained

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Submission Requirements

1. Site plan

2. Drainage Plans

a. Pre-excavation

b. Site operation

c. Post-reclamation

3. Details & soils information4. Stormwater report with calculations

5. Erosion & sedimentation control plan

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Stormwater Standards

Basic standard for erosion control

General standard for stormwaterquality

Phosphorus standard for lakewatersheds

Urban impaired stream standard Flooding standard for quantity

Match flow type

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General Standard

Treat 95% of impervious area

Rule of thumb: if not planned to be re-vegetated, count it as impervious.

Treat 80% of developed area

Includes impervious area

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Flooding Standard

No increases in peak flows for 2, 10,25 year storm events

Typically controlled by wet or drydetention basins

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Quantity Standards

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The Kinds of BMPs

1. Vegetated Buffers

2. Wet Ponds

3. Vegetated Soil Filters4. Bio-filtration

5. Manufactured systems

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Vegetated Buffers

Two kinds

Wooded

Meadow

Sheet flow into buffer required

Maximum slope

Required widths vary by slope andsoil type.

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Wet Ponds

Water quality volume (WQV)

Storage on top of WQV Stream protection

Gravel outlet

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Vegetated Soil Filters

18 inches of storage on surface

Soil filter media

Perforated drains Liner if within groundwater or close to

ledge

Mowed once annually No flows until stabilized Can be

tricky.

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Bio-filtration

More expensive per square foot

Treats less area

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Most Bang for your Buck?

Depends on operation.

Typically Buffers are most cheapest.

Wet Ponds Vegetated Soil Filters

Biofiltration and manufactured

systems are usually the mostexpensive.

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Stormwater PollutionPrevention Plan (SWPPP)

Amendments to the Clean Water Actin 1987 mandated that EPA addressstormwater discharges

National Pollution DischargeElimination System (NPDES)

State has a Multi-Sector GeneralPermit that industrial sites can join

Most sites must have SWPPPs.

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Components of a SWPPP

1. Overview narrative

2. Planning & Organization

3. Assessment4. Implementation

5. Evaluation

6. Certification

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Planning and Organization...

SWPPP Coordinator and Team

Leader

Typical responsibilities

Authorization of all BMPs

Ensures all team members are trained and

aware of current regulations

Supervise quarterly inspections & sampling

Maintain documentation, reports and

certifications

Make SWPPP available to regulatory agencies &

public

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Members

Typical responsibilities:

Implementation of all BMPs.

Perform inspections and water sampling.

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Assessment

1. Site description

2. Site map

3. Significant material inventory

4. Vehicle washing and wastewater

5. Summary of past spills & leaks

6. Non-stormwater discharges

7. Allowable non-stormwater discharges

8. Site summary: sources of possiblestormwater pollution

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Implementation

1. Good Housekeeping

2. Preventive Maintenance

3. Erosion & Sediment Control

4. Inspection and Maintenance ofStormwater System

5. Stormwater Management

6. Spill Prevention and Response7. Employee Training

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Good Housekeeping

Equipment maintenance in doors

Any leaks/spills immediately cleanedup with absorbent

Washing of equipment & vehiclesdone in designated areas

Material handling areas contained

Sweeping of paved areas

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Preventive Maintenance

Staff education

Hydraulic equipment in good repair Stormwater system maintenance

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Erosion & Sedimentation

Control

Grading crowns on gravel roadways

Maintaining vegetation on slopes Maintain sheet flows

Maintain stormwater system

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Inspection & Maintenance of

Stormwater System

Pipe systems clear ofdebris/sediment

Culvert inlet & outlet rip rapmaintained

Ditched cleaned to maintain capacity

Ponds dredged

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Spill Prevention & Response

Spill kits located near fueling areas

Ensure employees understand spillcontrol/response procedures

Spill prevention, control andcountermeasure plan (SPCC) ifapplicable

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Employee Training

Components and goals of theSWPPP

Spill control & response

Erosion control

Stormwater system

Truck & equipment washing Loading & unloading procedures

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Evaluation

Quarterly visual monitoring &inspection

Copies of forms kept with SWPPP

Plan revisions

Plan reviewed annually for effectiveness

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Visual Monitoring

The usual suspects:

Foam, Color, Odor, Clarity

Floating solids

Settled solids

Suspended Solids

Oil sheen

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xxx

xxx

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For More Information

Helpful links at www.BlaisCE.com

Stormwater BMP Manual

Chapter 500 Rules

DEP SWPPP regulations and examples

Other permit related information

If you dont find what youre looking

for, ask:

Fill out form on www.BlaisCE.com

http://www.blaisce.com/http://www.blaisce.com/http://www.blaisce.com/http://www.blaisce.com/