Therefore, U.S. EPA regulated storm water using general NPDES permits without specific numeric limits. Instead, the general permit would require the development of a storm water pollution prevention plan (SWPPP) which required companies to institute "best management practices" (BMPs) to reduce pollution from run-off. The effectiveness of BMPs were evaluated by monitoring pollutant levels in run-off. but permits did not contain specific numeric effluent limits that had to be met.
EPA recognized the difficulties in trying to establish a numeric effluent limit for storm water discharges due to the variables involved. For instance, due to the variability of the size and nature of storm events, the amount of pollutant leaving a site in run-off was difficult to evaluate.
In 2002, EPA issued guidance that stated numeric limits would only be used "rarely" in storm water NPDES permits. However, EPA believe technology has improved and has signaled a shift toward numeric limits for storm water control. In 2010, EPA issued a controversial revision to that guidance indicated numeric values may be appropriate. (See, "Guidance on Establishing TMDL Waste Load Allocations for Storm Water Discharges in NPDES Permits" EPA November 2010)
Benchmarks Versus Numeric Limits
The first step toward numeric limits is EPA's use of "benchmarks" in storm water permits. EPA makes clear that benchmarks are not effluent limits. This means an exceedence of the numeric value is not a violation. However, the exceedence is evidence that BMPs need to be improved to reduce pollutant loading.
First, the permit contains industry specific requirements (which is why the permit is 141 pages long). Second, it uses benchmarks tied to specific industrial activity that will be used to determine the effectiveness of BMPs.
Ohio EPA's new General Permit became effective starting January 1, 2012. However, facilities will still be covered by their old general permits, as long as they are still effective. Existing facilities will begin the transition to the new permit upon notification from Ohio EPA.
Ohio EPA will send written instructions to existing covered facilities on how to continue their general permit coverage with the submittal of a “re-notification” of intent to be covered. The existing facility will have 90 days to submit the re-notification.
The new permit is effective for five years. During the first four years of the permit, facilities to which the industry specific benchmarks apply, will monitor their compliance with the benchmarks.
You might also like
Curious George Coloring and Activity Book Set (2 Coloring Books)
Toy (PBS Kids)
Growing veggies safely in your backyard: avoiding the 'legacy of our .. — ABC Online
Growing veggies safely in your backyard: avoiding the 'legacy of our industrial activities'. 702 ABC Sydney. By Georgia Wilson. Updated August 29, 2014 16:44:22.
Accuform Signs SBMASE809VA Aluminum Spanish Bilingual Sign, Legend "NOTICE ALL ACTIVITIES MONITORED BY VIDEO CAMERA/AVISO TODAS LAS ACTIVIDADES SE MONITOREAN CON UNA CAMARA DE VIDEO" with Graphic, 14" Length x 10" Width x 0.040" Thickness, Red/Black on White
BISS (ACCUFORM SIGNS)
Iphone 5/5s Camouflage Heavy Duty Industrial Strength Rugged Camo Case for Hiking, Camping, Boating and outdoor Activity with Metal Clip and Belt loop
Facility Planning Design for Health Physical Activity, Recreation, and Sport
Book (Sagamore Publishing LLC)
Sqwincher 016401-CH 47.66 oz Powder Concentrate Electrolyte Replacement Beverage Mix, 5 Gallon Yield, Cherry Flavor (Case of 16)