1. (1 pt each) True or False:

a. T F  The CERCLA legislation provides regulatory guidance for hazardous and MSW landfills.

b. T F  The double layer thickness of a clay increases with increasing cation concentration.

c. T F  To ensure stability of the cover soil on a side-slope, the slope angle should be less than the soil-membrane friction angle.

d. T F  The largest component of the waste stream to MSW landfills is plastics.

e. T F  SVE is not an effective way to remove large quantities of free product.

f. T F  Mud rotary drilling works fine for direct sampling of contaminated sites, but should not be used to drill monitoring wells.

g. T F  Soil gas surveys work best with fine-grained soils.

h. T F  Floating DNAPL can be concentrated for easier removal in the cone of depression using a double pump system.

i. T F  For BTEX sites, most of the mass of the plume is degraded via aerobic respiration

j. T F  The leachate produced by waste decomposition generally has a high pH.

k. T F  In situ fluorometry can be used in either a downhole or cross-hole approach.

l. T F  Genetic engineering of bacteria is a hot research topic for bioremediation because at most sites, the bacteria in the groundwater are incapable of degrading the contaminant.

m. T F  Natural attenuation is protective at about 80% of BTEX-contaminated sites.

n. T F  The EPA minimum technology guidance calls for three monitoring wells upgradient and one monitoring well downgradient from a landfill.

o. T F  Soil vapor extraction via "passive extraction" resulting from fluctuations in barometric pressure requires a low K zone or cap at the surface.