ENVIRONMENTAL ENGINEERING Practice Question (a) List the three categories of use that account for most of the wells constructed,and identify the characteristics that are common to all wells.a) Production wells that yield fluid deposits (water, oil, gases etc).b) Injection wells that serve as disposal conduits for hazardous or industrialliquid waste. They may also serves as points for Aquifer Recharge.c) Monitoring wells that are used to measure groundwater levels and quality. (b) Consider a contaminant plume that is 100m wide x 30m thick x 1000m long. Ifd’Arcy’s velocity is 2.0 x 10 -6 m/s and the aquifer porosity is 0.3, whatminimum pumping rate would assure full plume capture, and how far apartshould two wells be placed for optimal location / alignment along the leadingedge of the plume? (C). How long would it take to pump an amount of water equal to the volume of the water contained in the plume? State any assumptions made.

identify drinking water standards, Overview of typical processes used for contaminant removal, preliminary treatment processes

Although gas station owners lock their tanks at night, a gas station owner was the victim of theft because his employee had a key to the tank. The owner of the gas station wants to bury the gasoline so deep that no vacuum pump will be able to extract it. He has hired a general contractor to dig the holes for the tanks. What is the minimum gasoline surface depth ℎ2 needed to prevent siphoning by any pump? Assume the specific gravity of gasoline is 0.733 and that the tank is not sealed. (You can ignore the drop rate of the gasoline level inside of the tank.) ℎ2=   The gas station owner balks at the contractor's estimate. He neither has the funds nor approval from the city to dig that deeply. However, the contractor tels him that the best a thief could hope to have at his disposal is a 212‑mbar vacuum pump. Anything better would be enormously expensive. Given this information, how deep ℎ2 would the gasoline have to sit below the surface to keep it safe from thieves? ℎ2=

When groundwater is pumped out of a well, what effect does it have on the water table?