Source area is located behind gasoline station, far
right, and oak trees (Quercus virginiana).
|
Local ground-water discharge area is this concrete-lined drainage
ditch, located about 800 ft from the source area. |
Direct-push investigation of discharge of MTBE-contaminated ground
water into a surface-water body.
|
Two rows of variably screened ("nested") monitoring points, screened
from shallowest to deepest, left to right. Blue marks on well casing
indicate level of ground water in well, with higher water-levels in
deeper wells, indicating a location of ground-water discharge. |
Increment borer used to obtain core material from trees growing
above gasoline-contaminated ground water.
|
Tree core material inside a gas-tight vial. Needle and syringe can
be used to remove headspace sample for analysis. Methanol can also
be added before the core is collected, and the methanol extractant
is analyzed. |
A diving plume is caused by localized recharge deflection of ground-water
flowlines and hence dissolved-phase transport. |
Size of oak tree cored. |
