Storm Water Pollution Prevention Plan (SWPPP) - the City of Lompoc!

Ordercause physical impacts on receiving waters if storage volume isinadequate or due to sudden releases of the ATS batches andimproperly designed outfalls.71. If designed, operated and maintained properly an ATS can achievevery high removal rates of suspended sediment (measured asturbidity), albeit at sometimes significantly higher costs than traditionalerosion/sediment control practices. As a result, this General Permitestablishes NELs consistent with the expected level of typical ATSperformance.72. This General Permit requires discharges of storm water associatedwith construction activity that undergo active treatment to comply withspecial operational and effluent limitations to ensure that thesedischarges do not adversely affect the beneficial uses of the receivingwaters or cause degradation of their water quality.73. For ATS discharges, this General Permit establishes technology-basedNELs for turbidity.74. This General Permit establishes a 10 year, 24 hour (expressed ininches of rainfall) Compliance Storm Event exemption from thetechnology-based numeric effluent limitations for ATS discharges.Exceedances of the ATS turbidity NEL constitutes a violation of thisGeneral Permit.L. Post-Construction Requirements75. This General Permit includes performance standards for postconstructionthat are consistent with State Water Board Resolution No.2005-0006, "Resolution Adopting the Concept of Sustainability as aCore Value for State Water Board Programs and Directing ItsIncorporation," and 2008-0030, “Requiring Sustainable WaterResources Management.“ The requirement for all construction sites tomatch pre-project hydrology will help ensure that the physical andbiological integrity of aquatic ecosystems are sustained. This “runoffreduction” approach is analogous in principle to Low ImpactDevelopment (LID) and will serve to protect related watersheds andwaterbodies from both hydrologic-based and pollution impactsassociated with the post-construction landscape.76. LUP projects are not subject to post-construction requirements due tothe nature of their construction to return project sites to preconstructionconditions.2009-0009-DWQ 12 September 02, 2009