Remediation manual for contaminated sites An underground storage tank leak has r
ID: 236977 • Letter: R
Question
Remediation manual for contaminated sites
An underground storage tank leak has resulted in soil and groundwater contamination by long. trichloroethene TCE. The contamination plume is about 50 meters wide and 200 meters The water table is 7 meters BGS, and the aquifer thickness is 12 meters. The average concentration of TCE in the groundwater is 800 micrograms per liter. The soils are a silty sand an organic content of 0.8%. The groundwater gradient is 0.004. The hydraulic conductivity is 10 meters per second. timate the mass of TCE in the vapor above the plume, dissolved in the groundwater, and l. adsorbed to the saturated soils. 2. A river is located 300 meters d gradient from the edge of the plume. How long (days) will it take for the contaminated plume to reach the river. CThe TCE, not just the groundwater).Explanation / Answer
Mass= volume *concentration
M= 120000 *800
M= 96000000 m microg/litre
Time= conductivity /slope *distance
Time = 0.004/. 001*300
Time = 1200 sec