Understanding Construction Stormwater Pollution Prevention Plans and Regulations, Slides of Water and Wastewater Engineering

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Stormwater Pollution

Prevention Plans

1

Objectives

• Know the brief legislative background of stormwater discharges
• Know what a SWPPP is and what is included in a SWPPP

2

Definitions

• SWPPP-Stormwater Pollution Prevention Plan
• NPDES-National Pollutant Discharge Elimination System
• SPDES-State Pollutant Discharge Elimination System
• MS4-Municipal Separate Storm Sewer System
• NOI-Notice of Intent
• Blue Book-”New York Standards and Specification for Erosion and Sediment Control”

3

4

History

• Water Quality Act-
  • First regulations dealing with discharge of stormwater
• Phase I Stormwater Regulations-
  • NYSDEC is local permitting authority
  • NYSDEC issued 2 general permits-
    • Industrial Site Runoff
    • Construction Projects > 5 acres (Phase I)
• Phase II Stormwater Regulations-
  • Apply to Construction Projects > 1 acre

5

On-Line References

• New York State Stormwater Management Design Manual
• New York Standards and Specifications for Erosion and Sediment Control

6

General Permit

• Operator must submit NOI
• Operator must prepare SWPPP (water quality and quantity control)
• Operator is responsible for implementing all measures outlined in the SWPPP - Inspections every 7 days and after a storm event of 0.5 inches or more - Inspection summaries prepared by a “qualified professional” must be posted for view by the public. - NYSDEC can fine up to $25,000 per day of violation

7

Maintaining Water Quality

• No increase in turbidity that will cause a substantial visible contrast to natural conditions
• No increase in suspended, colloidal and settleable solids that will cause deposition or impair the waters for their best usages
• No residue from oils and floating substances, nor visible oil film, nor globules of grease 8

Erosion Factors

• Soil Type
  • Higher potential – silt and fine sand
  • Lower potential –clays and organics
• Vegetative Cover
• Topography
• Climate
• Season

9

SWPPP-Contents

• Standards for Construction Activities
• Background project info
• Site Map
• Soil Description
• Construction Phasing Plan
• Pollution Prevention Measures
• Description of Construction and Waste Materials
• Temporary and Permanent Structural and Vegetative Measures

10

SWPPP-Contents (contents)

• Map showing control measures
• Details of control measures
• Identify temporary measures to be converted to permanent control measures
• Maintenance Schedule
• Name of receiving water
• Description of structural practices used to divert flows
• Description of existing data that describes the stormwater runoff characteristics at the site

11

Commonly Used SWPPP Measures

• Construction Entrance
• Mulching/Seeding
• Silt Fences
• Straw Bale Dikes
• Drop Inlet Protection
• Stone Check Dams
• Prefabricated Check Dams

12

Construction Entrance

http://www.harfordcountymd.gov/dpw/eng&const/WaterResources/Images/Sedimentcont2.jpg^13

http://pasture.ecn.purdue.edu/~sedspec/sedspec/images/construction.jpg

Erosion Control (Mulching/Seeding)

14

http://www.terra-mulch.com/photos/11-11.JPG http://www.ssseeds.com/ecb/photos/WS05/images/WS05%202-1%20Over%20Mulch.jpg

Silt fences

15

www.acfenvironmental.com/ bmp_siltfence.htm www.forestry.state.ar.us/ bmp/appn_soil.html

Straw Bale Dikes

16

http://www.salmonhabitat.org/images/v3f52b.gif

http://www.forester.net/images/ec_0103_p78_top.jpg

Drop Inlet Protection

17

http://unix.eng.ua.edu/~rpitt/Class/Erosioncontrol/Module8/Module8_files/image050.gif

http://www.greatamericantec.com/images/inlet.jpg

18

Blue Book—Storm Drain Inlet Protection

• Type I Excavated Drop Inlet Protection
• Type II Fabric Drop Inlet Protection
• Type III Stone & Block Drop Inlet Protection
• Type IV Curb Drop Inlet Protection

19

Blue Book—Type I Excavated Drop Inlet Protection

20

21

Blue Book— Type II Fabric Drop

Inlet Protection

22

Blue Book— Type III Stone & Block

Drop Inlet Protection

23

Blue Book— Type III Stone & Block

Drop Inlet Protection

24

Blue Book— Type III Stone & Block

Drop Inlet Protection

Stone Check Dams

25

http://www.ncc-swnpdes.com/images/stone_creek_dam.jpg (^) http://www.dfr.state.nc.us/images/wq/glossary/rockcheckdam.jpg