Sign up at: September 22 nd , 2015 www.stormwaterawareness.org Workshop is free! 3:30PM Nevada County Contractor’s Association 149 Crown Point Ct. Grass Valley, CA 95945 Storm Water Basics for Construction Sites Presented by Representatives from the City of Grass Valley and Nevada County
Storm Water Basics for Construction Sites Workshop Agenda • Introductions • Permit Basics • Erosion and Sedimentation Defined • Best Management Practices (BMP) • Stormwater Toolbox • Questions / Answers
Storm Water Basics for Construction Sites Introductions • 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 Workshop Agenda • Introductions • Permit Basics • Erosion and Sedimentation Defined • Best Management Practices (BMP) • Stormwater Toolbox • Questions / Answers
Storm Water Basics for Construction Sites Permit Basics • 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 15 th and April 15 th (the rainy season). • All grading between April 15 th -October 15 th shall have planting completed no later than November 1 st . 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 15 th and April 15 th (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 owner) 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 Workshop Agenda • Introductions • Permit Basics • Erosion and Sedimentation Defined • Best Management Practices (BMP) • Stormwater Toolbox • Questions / Answers
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 other.
EROSION CONTROL Erosion Contro l 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 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.
Storm Water Basics for Construction Sites Workshop Agenda • Introductions • Permit Basics • Erosion and Sedimentation Defined • Best Management Practices (BMP) • Stormwater Toolbox • Questions / Answers
Storm Water Basics for Construction Sites Best Management Practices (BMP’s) 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) 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 out out 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.
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