Calculate the double integral.Round your answer to two decimal places. 
Definitions:
Contamination
The presence of unwanted substances or pollutants in the environment or in a material, often causing harm or decreasing quality.
Stratification
The layering or division of society into classes, or the layering of sediments or particles in geological formations.
Surface Freshwater
Bodies of water found on the Earth's surface, such as rivers and lakes, that contain low concentrations of salt.
Great Lakes
A group of five large freshwater lakes located on the border between the United States and Canada, known for being the largest group of freshwater lakes by surface area in the world.
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