Persons who have operational control over construction plans and daily supervision of activities taking place on a construction site are required to meet with storm water discharge demands. More precisely, projects are typically responsible for disturbing acres of soil and those that are part of a larger common plan of development are typically required to get coverage under the General Permit for Discharges of Storm Water Associated with Construction Activity. This is a permit that regulates the activity of the construction site and makes reference to clearing, disturbing the ground and other activities. The main function of the permit is to make sure that industrial facilities both monitor and control precipitation discharges, but more importantly that this is done in such a way so as not to impact the environment.

The reason why storm water runoff is so important is that it tends to flow over the land and it does not penetrate the soil. Although overflow occurs quite naturally in small amounts during storm events, impervious surfaces such as buildings or roads alter the hydrology of the land. The result is that the volume of the suface water increases as well as the velocity, which means that the infiltration capacity of the runoff is significantly decreased. In the absence of storm water drainage, stream banks erode, flooding can occur, not to mention that the biological habitat of the streams is severely affected. In addition to this, the surplus picks up on its way all sorts of debris like trash and sediments, or even toxins.

Basically, the Construction General Permit requires projects to develop and implement a SWPPP plan. To be more specific, the SWPPP stands for Storm Water Pollution Prevention Plan. This is a written document that is meant to identify potential sources of snowmelt pollution at the premises of the construction site. A SWPPP has to describe the main characteristics of the pollutants that impact precipitation quality as well as listing them.In addition to this, the document describes the main practices used to reduce pollutants in precipitation discharges, such as allowing the rain to actually infiltrate the soil. These procedures highlight the use of Best Management Practices and they are flexible in terms of addressing sources of pollutants at industrial facilities.

The documentation comprises a map that describes the work and storage areas, a topographic map, an estimate of the runoff coefficient and last but not least a narrative account of significant materials, management practices, structural controls and storm water treatment processes. The conclusion is that any project has to have an annual inspection performed by personnel identified in SWPP, such as that working for Xpress SW3P. This personnel sees if the description of the potential pollutant sources is accurate and they can also update drainage maps so as to reflect the current conditions.

The operator is obliged to comply with all the terms and conditions of the construction permit, meaning that the suggested procedures will be implemented as soon as possible. While it is not necessary to submit the plan to the Regional Board, you must make it available for inspectors.