REMEDIAL ACTION WORK PLAN OPERABLE UNIT 2, LANDFILL ...

training exercise and, as the fire department, they are also responsible for permits and fire control
within the training area.
Action:
None.
8. Comment:
The site plan, Figure 2.1, does fiot appear to show any stockpile areas for overburden from Area A.
Please check,
Response:
Concur.
Action:
Figure 2-1 will be revised to include stockpile areas.
9. Comment:
How much interim cover is included in the RAWP? Where is this material to come from and where
is it shown in the soil balance diagrams? It is not clear what best construction practice can be used
to deal with odors or vermin without covering the refuse. Please explain.
Response:
The original intention of the HLA design was intended to provide an “interim cover” of one foot
over the refuse from Area A. IT’s schedule does not provide for a delay period to shut down
operations, therefore an interim cover is not required. One foot of clean soil will be placed over
the consolidated refuse from Area A. The cleans soil will come from the existing cover soil on
the landfill areas or from the clean, borrow areas on hea A. The clean soil will be in addition to.
one foot of graded refuse with no large materials. Because it provides the foundation for the
geosynthetic liner, this soil layer is termed the foundation layer. The foundation layer also covers
the contaminated refuse and separates the contamination from the liner installers. In this
application, the terms “interim cover” and “foundation layer” are synominous.
Results of test trenching indicate little odors or food for vermin. The excavated waste consisted
predominately of native sandy soils, construction debris, wood, concrete, steel, and small amounts
of inert plastics and metals. “Best construction practice” means that if there is odor or vectors, then
daily cover or synthetic liners will be placed over the excavated waste. Daily cover, if necessary,
will be accomplished with clean materials from the step-back excavations at the Area A trenches and
clean trench cover materials. Daily cover is a minimum thickness of six inches. Compaction will be
accomplished by landfill compactors running over the waste.
Action:
Delete the words “interim cover” and replace with the correct term, “cover soils”.
SJ/4-23-96/SACTERClFTORDOU2/USEPA
B-5