Storm Water Permitting & SWPPP


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The occurrence of storm water discharges to “Waters of the State” in association with industrial activities or disturbance of at least one acre during construction projects necessitates the acquisition of a general National Pollutant Discharge Elimination System (NPDES) storm water permit. In certain circumstances, it may be necessary to obtain an individual NPDES permit to cover discharges other than storm water (e.g., treated wastewater). Cox-Colvin can provide assistance with preparation of a general or individual NPDES storm water permit application.

One of the requirements of an NPDES permit that covers storm water discharges is the preparation and implementation of a Storm Water Pollution Prevention Plan (SWPPP). A SWPPP identifies potential pollution sources which may reasonably be expected to affect the quality of storm water discharges associated with industrial or construction activity, describes and ensures the implementation of practices which are to be used to reduce the pollutants in storm water discharges associated with industrial or construction activity, and assures compliance with the terms and conditions of the NPDES permit. Cox-Colvin routinely prepares new SWPPPs and updates existing SWPPPs to comply with NPDES permits and reflect current site operations and conditions.

One of the key and required activities associated with preparation or update of a SWPPP is a site visit. The site visit allows Cox-Colvin to understand site operations or planned construction activities, identify areas of interest, provide the client with advice related to best management practices, and develop a protocol for collection of storm water samples (if required by the NPDES permit). For preparation of a construction SWPPP, it is crucial for Cox-Colvin to work closely with the contractor who will be implementing the actual construction activities. This partnership will better assure that necessary information and designs are reflected in the SWPPP and the project runs smoothly without delays.