Civil Engineering PE Environmental Engineering and Stormwater Management 2

Question 1

Biochemical oxygen demand (BOD) measures:

Accepted Answer

Oxygen consumed by microorganisms decomposing organic matter

Answer

Total organic carbon concentration in wastewater

Answer

Chemical oxygen demand of inorganic compounds

Answer

Dissolved oxygen concentration in a receiving stream

Question 2

The Streeter-Phelps DO sag curve downstream of a wastewater outfall shows:

Accepted Answer

A dissolved oxygen deficit that deepens then recovers downstream

Answer

Immediate increase in DO due to reaeration

Answer

Constant DO at saturation throughout

Answer

An irreversible drop in DO with no recovery

Question 3

An NPDES permit under the Clean Water Act regulates:

Accepted Answer

Point source discharges of pollutants to navigable waters of the US

Answer

Nonpoint source pollution from agricultural fields

Answer

Underground injection of industrial wastes

Answer

Atmospheric deposition of nitrogen to water bodies

Question 4

A bioretention cell (rain garden) removes stormwater pollutants primarily through:

Accepted Answer

Filtration through engineered soil media combined with plant uptake

Answer

Sedimentation in a permanent pool

Answer

Chlorination of captured runoff

Answer

UV disinfection of stormwater

Question 5

A Total Maximum Daily Load (TMDL) establishes:

Accepted Answer

The maximum pollutant load a water body can receive and still meet water quality standards

Answer

The maximum stream flow rate allowable below a dam

Answer

The daily BOD limit for a single industrial discharger

Answer

The maximum design storm intensity for a watershed

Question 6

NPDES Construction General Permits require a Stormwater Pollution Prevention Plan (SWPPP) for land disturbance areas of:

Accepted Answer

1 acre or more

Answer

Any size

Answer

0.25 acres or more

Answer

5 acres or more