NPDES Compliance

NPDES Compliance

The National Pollutant Discharge Elimination System (NPDES) is a Federal program intended to control water pollution by regulating point sources that discharge pollutants into waters of the United States. Point sources are discrete conveyances such as pipes or man-made ditches.

In California, the NPDES program is administered by the California Environmental Protection Agency through its State Water Resources Control Board and nine Regional Water Quality Control Boards.

The San Francisco Bay Regional Water Quality Control Board oversees the program in the Bay Area. It does so by regulating discharge through a variety of permits. These include the Construction General Permit, the Municipal Regional Permit. and the Industrial General Permit.

Alaco can assist government agencies, businesses, and private property owners with their need to comply with NPDES requirements by developing and overseeing the implementation of appropriate Stormwater Pollution Prevention Plans (SWPPPs) and Best Management Practices (BMPs).

Construction General Permit

SWPPP Development and Oversight

Pursuant to California's Construction General Permit, planned construction activity that will result in a land disturbance of one acre or more may only proceed, with few exceptions, upon the approval and implementation of a site-specific Storm Water Pollution Prevention Plan (SWPPP).

The level of effort and cost associated with developing and implementing a custom SWPPP is dependent upon the scope of the project and its General Permit category. A construction project is categorized by the General Permit as either a traditional project or a linear underground/overhead (utility) project (LUP). Both categories are further subdivided by three. The subcategories for traditional projects are identified as risk level. For LUPs, they are identified by type. Risk Level 1/Type 1 projects have the least amount of General Permit requirements, where as Risk Level 3/Type 3 projects have the most.

Alaco can assist clients with the risk assessment of site's potential to generate sediment and the threat posed to receiving waters and to plan for the control of all pollutants and their sources. However, Alaco does not currently offer oversight services (inspections, water testing, reporting).

Water Pollution Control Plans (WPCC) Preparation

When a project is not subject to the General Permit, some entities or project owners may still require at least a minimal plan to guard against water pollution. Such is the case with Caltrans, which requires a Water Pollution Control Plan (WPCP) for projects under one acre.

Municipal Regional Stormwater Permit | C.3

Section C.3 of the Bay Area's Municipal Regional Stormwater Permit requires projects that create and/or replace 10,000-square-feet or more of impervious surface area (with limited exceptions) to incorporate the following stormwater controls:

• site design measures,

• source control measures, and

• stormwater treatment measures.

Section C.3 also requires projects that create and/or replace one acre or more of impervious surface area and increase impervious area over the pre-project condition need to incorporate hydromodification management measures, if the project is located in an area susceptible to hydromodification.