Post on 09-Nov-2018
Storm Water Basics for Construction Sites
September 22nd, 20153:30PMNevada County Contractor’s Association149 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 SitesWorkshop Agenda
• Your presenters: City of Grass Valley and Nevada County staff
• Storm Water Awareness Week 2015https://www.youtube.com/watch?v=U7B0WOlRIv0&feature=player_embedded
Storm Water Basics for Construction SitesIntroductions
• Introductions• Permit Basics• Erosion and Sedimentation Defined• Best Management Practices (BMP)• Stormwater Toolbox• Questions / Answers
Storm Water Basics for Construction SitesWorkshop Agenda
• California – State Water Resources Control Board
• Local Agencies• Nevada County• City of Grass Valley
• Construction Site
Storm Water Basics for Construction SitesPermit Basics
• California – State Water Resources Control Board• Regulates stormwater discharge from Nevada County, ultimately.
• Regulates stormwater discharge from the City of Grass Valley using theirMunicipal Storm Water Permitting Program. This program regulatesstormwater discharges from municipal separate storm sewer systems(MS4’s). The City of Grass Valley is a Phase II MS4. This means that theCity must comply with specific requirements as defined by the Stateincluding having a detailed stormwater program to reduce and eliminatestormwater pollution.
• Regulates stormwater discharge from construction sites over 1 acre insize or that discharge directly to a creek and requires those sites to obtainindividual permits for coverage under their Stormwater General Permit.This permit requires a Stormwater Pollution Prevention Plan (SWPPP) tobe prepared by a Qualified Stormwater Designer (QSD) and constructionto be overseen by a Qualified Stormwater Practitioner (QSP).
Storm Water Basics for Construction SitesPermit Basics
• Local Agencies Nevada County
• The CA Green Building Standards Code & County Ordinance requireserosion 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 whenapproved by the Building Official shall be replanted within 15 days of thegrading activity.
Storm Water Basics for Construction SitesPermit Basics
• Local Agencies City of Grass Valley
• Improvement Standards and the City’s Municipal Code requireerosion and sediment control on all construction projects.
• Construction sites with Grading Permits are required to have erosionand sediment control plans. Construction sites over 1 acre in size orthat discharge directly to a creek are required to have a SWPPP anda permit from the State.
• For Grading Permits, Engineering Inspectors check for erosion andsediment control before, during and after every qualifying rain event(when 50% chance of rain or ½ inch is predicted by the NationalWeather Service). Also, all erosion and sediment control materialsmust be on-site between October 15th and April 15th (the rainyseason).
• For Building Permits, Building Inspectors check for erosion andsediment control while doing other inspections.
Storm Water Basics for Construction SitesPermit 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
owner) must electronically submit Permit Registration Documents (PRDs) priorto commencement of construction activities in the Stormwater Multi- ApplicationReport Tracking System (SMARTS). PRDs consist of the Notice of Intent, RiskAssessment, Post-Construction Calculations, a Site Map, the SWPPP, a signedcertification statement by the LRP, and the first annual fee. LRP’s generallyhigher a QSP to prepare these documents.
• How long will it take for me to get my WDID number after I submit my PRDsto SMARTS? Is there a staff or public review process before the WDID isissued? Once the PRD’s have been submitted and are deemed complete by theSMARTS system, a Waste Discharge Identification (WDID) number willautomatically be emailed to the LRP.
Storm Water Basics for Construction SitesPermit Basics
• Introductions• Permit Basics• Erosion and Sedimentation Defined• Best Management Practices (BMP)• Stormwater Toolbox• Questions / Answers
Storm Water Basics for Construction SitesWorkshop Agenda
Storm Water Basics for Construction SitesErosion 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 other.
EROSION CONTROL Erosion Control reduces or eliminates
soil movement caused from rain or wind.
REMEMBER: If you have no erosion occurring, 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 BasicsSHEET EROSION
Erosion Control BasicsRILL EROSION
Erosion Control BasicsGULLY 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 without 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 SitesWorkshop 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 SitesBest 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 SitesBest Management Practices (BMP’s)
Storm Water Basics for Construction SitesBest Management Practices (BMP’s)
Example - erosion & sediment control
Storm Water Basics for Construction SitesBest Management Practices (BMP’s)
Example - erosion & sediment control
Storm Water Basics for Construction SitesBest Management Practices (BMP’s)
Example - Sediment control
Storm Water Basics for Construction SitesBest Management Practices (BMP’s)
Construction Entrances
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 be clearly identified, so that the washed out material is contained and can be disposed of properly.
They also must be located well away from storm drains, and drainage ditches.
Materials Handling and Storage
The following materials must be stored under cover and surrounded by containment berms:
Soil, Dirt and Fill MaterialsPaints and Solvents
Pesticides and HerbicidesFertilizersDetergents
Plaster or related productsConcrete compoundsAsphalt compounds
Petroleum products like fuel, oil, and greaseHazardous chemicals like acids, lime, glues, adhesives, and
curing compoundsAny 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 is being properly managed, and will not cause any problems or unnecessary expense, 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 SitesStormwater Toolbox
• Introductions• Permit Basics• Erosion and Sedimentation Defined• Best Management Practices (BMP)• Stormwater Toolbox• Questions / Answers
Storm Water Basics for Construction SitesWorkshop Agenda
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