1) Using the information
developed during the Phase I and Phase II Investigations, the
operator shall
conduct a Phase III Investigation. This investigation shall be conducted to
collect or augment the site-specific information needed to carry out the
following:
A) Verification and reconciliation
of the information collected in the Phase I and II investigations;
B) Characterization of potential pathways for
contaminant migration;
C)
Correlation of stratigraphic units between borings;
D) Continuity of petrographic features
including, but not limited to, sorting, grain size distribution, cementation
and hydraulic conductivity;
E)
Identification of zones of potentially high hydraulic conductivity;
F) Identification of the confining layer, if
present;
G) Concentrations of
chemical constituents present in the groundwater below the unit, down to the
bottom of the uppermost
aquifer, using a broad range of chemical analysis and
detection procedures such as, gas chromatographic and mass spectrometric
scanning. However, additional measurements and procedures shall be carried out
to establish background concentrations, in accordance with Section
811.320(d),
for:
i) Any constituent for which there is a
standard at 35 Ill. Adm. Code
620 established by the Board and which is
expected to appear in the leachate; and
ii) Any other constituent for which there is
no Board-established standard, but which is expected to appear in the leachate
at concentrations above PQL, as defined in Section
811.319(a)(4)(A)
for that constituent;
H) Characterization of the seasonal and
temporal, naturally and artificially induced, variations in groundwater quality
and groundwater flow; and
I)
Identification of unusual or unpredicted geologic features, including: fault
zones, fracture traces, facies changes, solution channels, buried stream
deposits, cross cutting structures and other geologic features that may affect
the ability of the operator to monitor the groundwater or predict the impact of
the disposal facility on groundwater.