Storm Water Basics for Construction Sites Presented by - - PowerPoint PPT Presentation

Storm Water Basics for Construction Sites

September 22nd, 2015 3:30PM

Nevada County Contractor’s Association 149 Crown Point Ct. Grass Valley, CA 95945

Presented by Representatives from the City of Grass Valley and Nevada County

Sign up at: www.stormwaterawareness.org Workshop is free!

• Introductions
• Permit Basics
• Erosion and Sedimentation Defined
• Best Management Practices (BMP)
• Stormwater Toolbox
• Questions / Answers

Storm Water Basics for Construction Sites

Workshop Agenda

• Your presenters: City of Grass Valley and

Nevada County staff

• Storm Water Awareness Week 2015

https://www.youtube.com/watch?v=U7B0WOlRIv0&feature=player_em bedded

Storm Water Basics for Construction Sites

Introductions

• Introductions
• Permit Basics
• Erosion and Sedimentation Defined
• Best Management Practices (BMP)
• Stormwater Toolbox
• Questions / Answers

Storm Water Basics for Construction Sites

Workshop Agenda

• California – State Water Resources

Control Board

• Local Agencies
• Nevada County
• City of Grass Valley
• Construction Site

Storm Water Basics for Construction Sites

Permit Basics

• California – State Water Resources Control Board
• Regulates stormwater discharge from Nevada County, ultimately.
• Regulates stormwater discharge from the City of Grass Valley using their

Municipal Storm Water Permitting Program. This program regulates stormwater discharges from municipal separate storm sewer systems (MS4’s). The City of Grass Valley is a Phase II MS4. This means that the City must comply with specific requirements as defined by the State including having a detailed stormwater program to reduce and eliminate stormwater pollution.

• Regulates stormwater discharge from construction sites over 1 acre in

size or that discharge directly to a creek and requires those sites to obtain individual permits for coverage under their Stormwater General Permit. This permit requires a Stormwater Pollution Prevention Plan (SWPPP) to be prepared by a Qualified Stormwater Designer (QSD) and construction to be overseen by a Qualified Stormwater Practitioner (QSP).

Storm Water Basics for Construction Sites

Permit Basics

• Local Agencies
• Nevada County
• The CA Green Building Standards Code & County Ordinance requires

erosion and sediment control on all construction/grading sites.

• Requires erosion control plans to be submitted with Building Permits.
• Construction sites over 1 acre in size are required to have a SWPPP and a

permit from the State.

• Building

Inspectors check for erosion and sediment control while completing inspections.

• All erosion and sediment control materials must be on-site between

October 15th and April 15th (the rainy season).

• All grading between April 15th-October 15th shall have planting completed

no later than November 1st. All other grading at other times when approved by the Building Official shall be replanted within 15 days of the grading activity.

Storm Water Basics for Construction Sites

Permit Basics

• Local Agencies
• City of Grass Valley
• Improvement Standards and the City’s Municipal Code require

erosion and sediment control on all construction projects.

• Construction sites with Grading Permits are required to have erosion

and sediment control plans. Construction sites over 1 acre in size or that discharge directly to a creek are required to have a SWPPP and a permit from the State.

• For Grading Permits, Engineering Inspectors check for erosion and

sediment control before, during and after every qualifying rain event (when 50% chance of rain or ½ inch is predicted by the National Weather Service). Also, all erosion and sediment control materials must be on-site between October 15th and April 15th (the rainy season).

• For Building Permits, Building Inspectors check for erosion and

sediment control while doing other inspections.

Storm Water Basics for Construction Sites

Permit Basics

• Construction Sites
• Required to obtain individual permits for coverage under the State’s Stormwater

General Permit when:

• construction disturbs  1 acre
• construction is part of “common plan of development or sale” with a planned

disturbance of  1 acre

• there is a potential for a significant water quality impact and construction

disturbs < 1 acre

• How do I apply for coverage? The Legally Responsible Person (LRP/property
• wner) must electronically submit Permit Registration Documents (PRDs) prior

to commencement of construction activities in the Stormwater Multi- Application Report Tracking System (SMARTS). PRDs consist of the Notice of Intent, Risk Assessment, Post-Construction Calculations, a Site Map, the SWPPP, a signed certification statement by the LRP, and the first annual fee. LRP’s generally higher a QSP to prepare these documents.

• How long will it take for me to get my WDID number after I submit my PRDs

to SMARTS? Is there a staff or public review process before the WDID is issued? Once the PRD’s have been submitted and are deemed complete by the SMARTS system, a Waste Discharge Identification (WDID) number will automatically be emailed to the LRP.

Storm Water Basics for Construction Sites

Permit Basics

• Introductions
• Permit Basics
• Erosion and Sedimentation Defined
• Best Management Practices (BMP)
• Stormwater Toolbox
• Questions / Answers

Storm Water Basics for Construction Sites

Workshop Agenda

Storm Water Basics for Construction Sites

Erosion and Sedimentation Defined

Erosion control measures and sediment control measures must be implemented simultaneously, prior to the defined wet season, to be effective in preventing pollution of storm water runoff! Neither method is sufficient without the

• ther.

EROSION CONTROL

 Erosion Control reduces or eliminates

soil movement caused from rain or wind.

 REMEMBER: If you have no erosion

• ccurring, you will generate NO

sediment.

Erosion Control Basics

 There are 4 basic types of

erosion

 Sheet Erosion  Rill Erosion  Gully Erosion  Wind Erosion

Rain is the major cause of soil erosion in and around Nevada County

Erosion Control Basics

SHEET EROSION

Erosion Control Basics RILL EROSION

Erosion Control Basics GULLY EROSION

 The USDA’s Natural Resources

Conservation Service defines a gully as:

 A rill that has become so large that a vehicle

cannot navigate over it or through it.

SEDIMENT CONTROL

 Sediment is the result of erosion.  Sediment Control Best Management

Practices attempt to control the sediment that was a result of Erosion.

Sediment Control treats soil as a waste product.

The most important thing to remember about sediment control:

It doesn’t work w ithout erosion control.

It is easy to see that the silt fence at the bottom of this hill has been completely overwhelmed.

• Introductions
• Permit Basics
• Erosion and Sedimentation Defined
• Best Management Practices (BMP)
• Stormwater Toolbox
• Questions / Answers

Storm Water Basics for Construction Sites

Workshop Agenda

Erosion Control



Vegetation (Retention and Establishment)



Ground Covers:



Mulch

 Clean Grain Straw Mulch  Wood Chip(s)  Erosion Control Blankets 

“Cat” walking/tracking slopes (roughness coefficient)



Cross Slope Diversion(s)



Wattles /Fiber Rolls



Earthen Berms



Dust Control



water trucks



Chemical Applications

Storm Water Basics for Construction Sites

Best Management Practices (BMP’s)

Sediment Control

 silt fences  straw wattles  straw bale dikes  sediment basins/traps  drop inlet protection  check dams  rock  sand bag  bale dikes

Storm Water Basics for Construction Sites

Best Management Practices (BMP’s)

Storm Water Basics for Construction Sites

Best Management Practices (BMP’s)

Example - erosion & sediment control

Storm Water Basics for Construction Sites

Best Management Practices (BMP’s)

Example - erosion & sediment control

Storm Water Basics for Construction Sites

Best Management Practices (BMP’s)

Example - Sediment control

Storm Water Basics for Construction Sites

Best Management Practices (BMP’s) Construction Entrances

Non-Storm Water Control Non-Storm Water Control

Messy sites demonstrate apathy for pollution prevention.

DO NOT wash tracked mud/pollutants directly into storm drain. First, sweep loose material, then collect and dispose of.

Concrete washout locations need to Concrete washout locations need to be be clearly identified, so clearly identified, so that that the the washed washed

• ut
• ut material is

material is contained and contained and can be can be disposed of disposed of properl properly. y.

They also must be located well They also must be located well away away from storm drains, from storm drains, and drainage and drainage ditches. ditches.

Materials Handling and Storage

The following materials must be stored under cover and surrounded by containment berms:

Soil, Dirt and Fill Materials Paints and Solvents Pesticides and Herbicides Fertilizers Detergents Plaster or related products Concrete compounds Asphalt compounds Petroleum products like fuel, oil, and grease Hazardous chemicals like acids, lime, glues, adhesives, and curing compounds Any other commonly used construction materials or byproducts.

If it rained on this site, this entire stockpile of backfill material would be washed into the storm drain.

An example of poor stockpile management.

This stockpile This stockpile is being properly is being properly managed, and managed, and will will not not cause any cause any problems or unnecessary expense, problems or unnecessary expense, should a storm event occur. should a storm event occur.

Erosion control blankets are easier to maintain and more effective than plastic.

An even better example of good stockpile management.

Storm Water Toolbox (see handout) Storm Water Basics for Construction Sites

Stormwater Toolbox

• Introductions
• Permit Basics
• Erosion and Sedimentation Defined
• Best Management Practices (BMP)
• Stormwater Toolbox
• Questions / Answers

Storm Water Basics for Construction Sites

Workshop Agenda

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