A National Pollution Discharge Elimination Permit: a. permits the holder to discharge pollutants at its point source. b. permits the discharge of smoke from utility plants equipped with scrubbers. c. permits the holder to discharge pollutants after pretreatment. d. permits the holder to discharge toxic pollutants.

The correct answer is letter A

National Pollutant Discharge Elimination System (NPDES) was developed by the federal government and is being implemented by the local and state government to address environmental problems created by stormwater runoff from developing properties.

The city of Marshall is required by the US Environmental Protection Agency (EPA) and the Minnesota Pollution Control Agency (MPCA) to reduce rainwater pollution for surface and groundwater. The city is required to operate with a Minnesota NPDES MS4 license and therefore the city of Marshall is a designated MS4. The MS4s designated by rules are cities and towns with a population of less than 10,000 and cities and towns with a population of 5,000 and discharging into valuable or polluted waters.

The main objective of the NPDES MS4 license is to restore and maintain the chemical, physical and biological integrity of the state's waters through the management and treatment or disposal of urban rainwater. As part of the NPDES MS4 license, the City of Marshall was required to develop and implement a Storm Water Pollution Prevention Program (SWPPP).

marginal cost is a microeconomic measure that us to evaluate the extent to which the level of production of a good is sustainable in accounting, that is, to how many quantities the company plans to profit from the production of the good.

the concept of marginal cost is simple, it means the cost of producing one more item. for example, in the case of pies, the marginal cost is the cost of producing one more pie than those that have already been produced.

it is important to understand that productive activity influences marginal cost. the marginal cost of some goods can be very high, while others may be insignificant. for example, the marginal cost of producing an extra plane is very high. already the marginal cost of a water company to provide 1l more water is derisory.

in the case of pies, the cost involves the inputs, the labor and the fixed cost, which involves the fixed space of the bakery. the level of production initially has the marginal cost decreasing because there is space and manpower available. however, to produce more you have to hire more workers and buy more inputs. if physical space is limited, workers will conflict with places, inputs and their productivity will decrease, meaning there is an optimum point of production for each level of space and manpower. from this point on, the productivity of the workers will be getting smaller because of lack of space, so that the marginal cost of producing one more pie will be increasing. so, although you have not posted the chart, but if you have the answer, you can see that my explanation goes according to the marginal cost curve that will increase from the 4th pie, answer (c).

because the early people found out about it.