2010 California Green Building Standards Code. Residential and Non-Residential Development

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1 2010 California Green Building Standards Code Residential and Non-Residential Development Stormwater Management (Site Development) Requirements Engineering, Surveying & Permit Services Department 2700 M Street, Suite 570, Bakersfield, CA Phone: Website: January 03, /3/11

2 2010 California Green Building Standards Code Residential Development Stormwater Management Requirements Per the 2010 CalGreen Building Standards Code , a residential development project that disturbs less than one acre of soil and is not part of a larger common plan of development that in total would disturb one acre or more shall manage their stormwater drainage during construction. One or more of the following measures shall be implemented to prevent flooding of adjacent property, prevent erosion and retain soil runoff on site: 1. Retention basins of sufficient size shall be utilized to retain stormwater on the site. 2. Where stormwater is conveyed to a public drainage system, collection point, gutter or similar disposal method, storm water shall be filtered by use of a barrier system, wattle or other method approved by the enforcing agency. 3. Compliance with a lawfully enacted storm water management ordinance. The Kern County Code of Ordinances, Title 14 Utilities, Chapter Stormwater Ordinance states in that prior to any discharge of stormwater into a County maintained stormwater system or conveyance the Discharger must obtain permission from the Director of the Engineering, Surveying & Permit Services Department. Furthermore, per non-stormwater discharges to a County maintained stormwater system or conveyance is prohibited. This includes sanitary wastewater, rubbish, refuse, litter, accidental spill discharges, garbage of any kind whatsoever, or any unsanitary or deleterious matter including, but not limited to, petroleum products, pesticides, herbicides, controlled substances, and hazardous materials. Attached is some information of Best Management Practices (BMPs) which may be used to help reduce or eliminate sediments and other pollutants in stormwater discharges. Stormwater contaminated with sediment and other pollutants that enter a private or county maintained drainage basin may adversely affect the underlying groundwater which is considered a water of the State and is protected by state and federal statues. 1/3/11

3 2010 CalGreen Building Standards Code Non-Residential Development Stormwater Soil Loss Prevention Plan Requirements Per 2010 CalGreen Building Standards Code errata dated 11/3/2010, non-residential projects less than one acre required a Stormwater Pollution Prevention Plan (SWPPP) conforming to the State stormwater NPDES General Construction Permit (CGP). The SWPPP requirement was removed and replaced with a requirement to develop a stormwater soil loss prevention plan. The soil loss prevention plan needs to be designed, specific to its site, and conform to the State stormwater NPDES General Construction Permit (CGP) DWQ or local ordinance, whichever is stricter, as required for projects one acre or more. For Kern County the CGP will apply. A nonresidential development includes newly constructed privately owned nonresidential structures, newly constructed state owned buildings, state universities, and all other occupancies where no state agency has authority; and where applicable, occupancies regulated by the Division of the State Architect including public schools and community colleges. The 2010 CBC Chapter 3 Use and Occupancy Classification has complete lists of uses for ten nonresidential occupancy groups that apply to the CalGreen code. The intent of the stormwater soil loss prevention plan is to ensure that newly constructed projects of less than one acre when soil is disturbed meet the same or similar State CGP DWQ or local ordinance requirements currently required for projects one acre or more. The intent of NPDES is to prevent the discharge of surface water pollutants, dust and sediment from the project site into receiving waters using BMPs. The stormwater soil loss prevention plan can be prepared by any individual acceptable to the design professional in charge. The stormwater soil loss prevention plan should cover prevention of soil loss by storm water run-off and/or wind erosion, of sedimentation, and/or of dust/particulate matter air pollution. No State permit is required, but construction best management practices (BMPs) as approved by the local enforcing agency shall be followed. BMPs include but are not limited to the following: Erosion and sediment control BMPs Scheduling construction activity Preservation of natural features, vegetation and soil Drainage swales or lined ditches to control stormwater flow Mulching or hydroseeding to stabilize soils Erosion control covers to protect slopes Protection of storm drain inlets (gravel bags or catch basin inserts) Perimeter sediment control (perimeter silt fence, fiber rolls) Sediment trap or sediment basin to retain sediment on site Stabilized construction exits 1/3/11

4 Wind erosion control Housekeeping BMPs: Material handling and waste management Building materials stockpile management Management of washout areas (concrete, paints, stucco, etc.) Control of vehicle/equipment fueling to contractor s staging area Vehicle and equipment cleaning performed off site Spill prevention and control No grading shall be done until the stormwater soil loss prevention plan has been approved by the enforcement agency (County of Kern). The contractor should employ the site-specific BMPs in the plan as needed and as conditions arise. The contractor should conduct site inspections before, during extended storm events, and after each storm event to identify areas that may contribute to erosion and sediment problems or any other pollutant discharges. Additional control measures need to be implemented immediately. 1/3/11

5 G:\EXCHANGE\1PC\dan\NPDES BMPS\SWPPP1.dwg, BMP INSTRUCTION, 6/26/2003 5:13:10 PM

6 G:\EXCHANGE\1PC\dan\NPDES BMPS\SWPPP1.dwg, BMP 1, 7/10/2003 8:55:30 AM

7 G:\EXCHANGE\1PC\dan\NPDES BMPS\SWPPP1.dwg, BMP A, 6/25/ :34:26 AM

8 G:\EXCHANGE\1PC\dan\NPDES BMPS\SWPPP1.dwg, BMP B, 6/25/ :35:11 AM

9 G:\EXCHANGE\1PC\dan\NPDES BMPS\SWPPP1.dwg, BMP C, 6/25/ :36:03 AM

10 G:\EXCHANGE\1PC\dan\NPDES BMPS\SWPPP1.dwg, BMP D, 6/25/ :36:31 AM

11 G:\EXCHANGE\1PC\dan\NPDES BMPS\SWPPP1.dwg, BMP E, 6/25/ :37:04 AM

12 G:\EXCHANGE\1PC\dan\NPDES BMPS\SWPPP1.dwg, BMP F, 6/25/ :37:38 AM

13 FUEL G:\EXCHANGE\1PC\dan\NPDES BMPS\SWPPP1.dwg, BMP G, 6/25/ :49:53 AM

14 G:\EXCHANGE\1PC\dan\NPDES BMPS\SWPPP1.dwg, BMP H, 6/25/ :38:36 AM