EXERCISE 12.7 Environmental Issue 2: Someone Is Polluting My Water! (continued)

Question

EXERCISE 12.7 Environmental Issue 2: Someone Is Polluting My Water! (continued) Name: Course: Section: Date: detection instruments to measure the amount of volatile compounds in the soil around the Smiths'home. These chemi- cals are released into the ground when corroded gas tanks leak and are indicators of soil and groundwater contamination. Concentrations greater than 50 parts per billion (ppb) are considered dangerous. The data are shown in red numbers on the map. Hint: Make a contour map of the soil contamination level using a 10-ppm contour interval. This is not a map showing el- evation, but the rules are very much the same. Color-code the map to show levels of potential danger: red for values above the danger threshold (50 ppb); a second color for probable future threat (between 30 and 50 ppb); and a third color for possible future threat (between 10 and 30 ppb). (a) Does either gas station have a leakage problem? Explain your conclusion. (b) In what direction does the local groundwater flow? How do you know? (c) Which homes will be the next to feel the effects of the gasoline leakage? (d) What additional problems has your research discovered?

Explanation / Answer

1: Yes both gas stations have leakage problem but the 'go fast gas' has high leakage compared to another one since area surround this station show more gas in water as compared to another one.

2: groundwater flow is in north-west direction because there is no leakage or low concentration of gas in the south eastern side of go fast gas station.

3: houses in southwestern side of map are in more danger

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