Tri Pond Excavation Soil Sampling Plan_20180130

MEMORANDUM
TO: Steven Lanter and Eric Smith
Groundwater Protection Unit
Division of Water Resources
THROUGH: David May, Supervisor 1)
Water Quality Regional Operations Section
Washington Regional Office
FROM: Will Hart, Hydrogeologist W T .
Water Quality Regional Operations Section
Washington Regional Office
SUBJECT: Excavation Soil Sampling Plan
Triangle Pond - H. F. Lee Energy Complex
DATE: January 30, 2018
On January 18, 2018 the Washington Regional Office received, via email, the document
referenced above (Plan). The Plan adequately addresses requirements laid out in
Attachment 1: Coal Combustion Residuals Surface Impoundment Closure Guidelines
for Protection of Groundwater. The Triangle Pond generally was not part of the CCR
management practices, so minimal excavation is expected at this stage. The sampling
grid and proposed laboratory analyses are sufficient should CCR be encountered. Data
collected from this phase of work will be incorporated into continuing assessment and
remedial activities at the site.
Personal communication with on -site staff indicate that the Triangle Pond was
historically used as a "metals cleaning pond." It was reported that the use of the pond in
this manner was minimal, but we have no documentation of the extent or duration. The
proposed sampling plan should aid in identifying any adverse impacts resulting from
historical use of the pond. There are no other usages reported for this impoundment.
These comments are limited to the specific scope of this phase of work. Please do not
hesitate to contact me if further clarification is needed.