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Review and Analysis of Chlorinated Solvent Dense Nonaqueous Phase Liquid Distributions in Five Sandy Aquifers

Department of Earth Sciences, University of Waterloo, 200 University Avenue West, Waterloo, ON, Canada N2L 3G1

View larger version (38K): [in a new window]   Fig. 1. Schematic representations of four scenarios for dense nonaqueous phase liquid (DNAPL) source zones in sandy aquifers: (a) DNAPL penetrates to bottom of homogeneous sand aquifer to form a bottom pool, (b) DNAPL penetrates through homogeneous sand and accumulates in a layered transition zone, (c) DNAPL forms layers of residual and free-product DNAPL suspended in the sand aquifer, (d) DNAPL forms multiple layers distributed throughout the aquifer thickness. Note that all scenarios have residual trails because the source zones are represented at early time.

View larger version (49K): [in a new window]   Fig. 2. Columns representing the geology at each of the five study sites. The depth zone of DNAPL source zone investigations at each site are indicated by the dashed lines.

View larger version (21K): [in a new window]   Fig. 3a. Profile from the Connecticut A Site WCP-9, next to a conventional well with DNAPL.

View larger version (21K): [in a new window]   Fig. 3b. Profile from the Connecticut A Site WCP-7, next to a conventional well with DNAPL.

View larger version (19K): [in a new window]   Fig. 3c. Profile from the Connecticut A Site WCP-11, within an area of a localized depression in the aquitard interface showing the thickest DNAPL accumulation zone.

View larger version (22K): [in a new window]   Fig. 4a. Profile from Connecticut B Site AT-1, where conventional wells contain DNAPL, at the location of a former plating shop degreaser.

View larger version (23K): [in a new window]   Fig. 4b. Profile from Connecticut B site at two locations where conventional wells contain DNAPL, BT-1 and BT-2, at the location of a former PCE bulk storage tank.

View larger version (24K): [in a new window]   Fig. 5. Profile from the Ontario Site AC-6 at the edge of a roadway adjacent to the site and next to a conventional well containing free-product DNAPL. Note that TCE concentrations for three points that fall above the concentration scale are posted.

View larger version (22K): [in a new window]   Fig. 6. Profile from Florida Site PM-18 at the only location where DNAPL was found. Groundwater concentrations are also shown for an adjacent profiler location (B207).

View larger version (19K): [in a new window]   Fig. 7a. Profile from New Hampshire Site SM-5 where DNAPL was found.

View larger version (20K): [in a new window]   Fig. 7b. Profile from New Hampshire Site SM-2 where DNAPL was found.

View larger version (38K): [in a new window]   Fig. 8. Illustration of the evolution of a layered DNAPL source zone showing complete dissolution of residual trails, shrinkage of some layers, and complete removal of others due to decades of groundwater flushing.