Water Pollution Control (CWA) Flashcards

A manufacturing facility has a pipe that discharges treated wastewater directly into a river. Under the Clean Water Act (CWA), what is this type of discharge conveyance called and what is required before this discharge is legally permissible?

Answer: Point source; a National Pollutant Discharge Elimination System (NPDES) permit

The Clean Water Act defines a 'point source' as any discernible, confined, and discrete conveyance, such as a pipe, ditch, or channel, from which pollutants may be discharged. Discharging pollutants from a point source into waters of the United States requires a National Pollutant Discharge Elimination System (NPDES) permit as mandated by Section 402 of the CWA.

A state environmental agency has determined that a specific lake is not meeting water quality standards for phosphorus, even with existing pollution controls. According to the CWA, what must the state develop for this impaired water body?

Answer: A Total Maximum Daily Load (TMDL)

Section 303(d) of the Clean Water Act requires states to identify waters that are not meeting water quality standards and, for those waters, develop a Total Maximum Daily Load (TMDL). A TMDL is a calculation of the maximum amount of a pollutant that a waterbody can receive and still meet water quality standards.

A road construction project will require placing rock and soil (fill material) into a federally protected wetland to create a roadbed. Which section of the Clean Water Act primarily governs this activity and requires a permit?

Answer: Section 404 - Permits for Dredged or Fill Material

Section 404 of the Clean Water Act establishes a program to regulate the discharge of dredged or fill material into waters of the United States, which includes wetlands. This program requires a permit from the U.S. Army Corps of Engineers before such an activity can proceed.

As an Environmental Compliance Officer at a large construction site disturbing more than one acre, you are responsible for developing a Stormwater Pollution Prevention Plan (SWPPP). Which of the following is NOT a required core element of a SWPPP?

Answer: A detailed inventory of all hazardous chemicals stored on site

While chemical management is important, a detailed hazardous chemical inventory is a primary requirement of EPCRA, not a core element of a SWPPP under the CWA. A SWPPP's focus is on identifying potential stormwater pollutants and detailing the controls (BMPs), site characteristics, and maintenance/inspection procedures to prevent those pollutants from leaving the site in stormwater runoff.

Which of the following pollutant sources is explicitly excluded from the CWA's definition of a 'point source' and is therefore NOT regulated through the NPDES permit program?

Answer: Agricultural stormwater discharges

The Clean Water Act's definition of a 'point source' in Section 502(14) specifically excludes 'agricultural stormwater discharges and return flows from irrigated agriculture.' While other forms of stormwater runoff (like from MS4s) are treated as point sources, agricultural runoff is considered nonpoint source pollution.

A facility's NPDES permit is set to expire in 8 months. To ensure the facility can continue its discharge operations without interruption, the CWA requires the permittee to submit a complete application for permit renewal at least how many days prior to the expiration date?

Answer: 180 days

Federal regulations under the Clean Water Act specify that to continue discharging beyond the 5-year maximum term of an NPDES permit, the permittee must submit a complete renewal application at least 180 days before the existing permit expires. This allows the permitting authority adequate time to review the application and issue a new permit.