At the McClellan Air Force Base site, which three of the following statement was

Question

At the McClellan Air Force Base site, which three of the following statement was/is true: a. The treatment system involved the use of GAC filtration. b. The main removal of VOC mass was achieved with air sparging and SVE. c. A rotating biological contactor (RBC) was used to treat off-gases. d. Capital costs were about $1.1 million. e. An incinerator was an important part of the treatment stream. Which two of the following are well known characteristics of air sparging as a groundwater cleanup method? a. Work very well in low permeability soils. b. Is usually used in conjunction with SVE. c. Is rarely used for chlorinated solvents like TCE. d. Excellent choice for removing hexavalent chromium. e. May stimulate biological degradation of pollutants. Which two of the following are well known characteristics soil vapor extraction as a groundwater cleanup method? a. Good choice for volatiles in the vadose zone. b. Good choice for removing hexavalent chromium. c. Work very well in low permeability soils. d. Can be effective at removing residual contamination in the saturated zone. e. Good choice for controlling soil vapors when also using air sparging. According to the reading and the lecture slides which three of the following contaminants concern at the Schnitzer/Moody Avenue site? a. DDT b. TPH c. Dioxins and furans d. Cadmium e. PCBs True or false? At the McCormick & Baxter CERCLA site: __________ DDT was a major COPC. ________ Impermeable capping was part of the groundwater remediation _________ Cleanup was paid for by a joint agreement between DEQ and McCormick & B _________ There was possible human exposure via air transport __________ A substantial amount of NAPL was extracted from the subsurface.

Explanation / Answer

10. The McCleann air force base site cost is about 1.1 million dollars. Gas filteration techniques were used and the removal of VoC mass done by air sparging.

Hence a,b,d are the correct options.

11. Air sparging is very useful for low permeability regions and it is conjucted with SVE.

Hence, options a, b are correct.

12 a, d are correct options.

13 TPH, diaxions and cadmium are the three contaminants.

Hence options b,c, and d were correct.

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