Indiana Administrative Code › Title 329 - SOLID WASTE MANAGEMENT DIVISION › Article 10 - SOLID WASTE LAND DISPOSAL FACILITIES › Rule 21 - Municipal Solid Waste Landfills; Ground Water Monitoring Programs and Corrective Action Program Requirements › Section 21-7 - Detection ground water monitoring program

Current through July 10, 2024
Authority: IC 13-14-8-7; IC 13-15; IC 13-19-3
Affected: IC 13-20; IC 36-9-30
Sec. 7.
(a) A
				detection ground water monitoring program that satisfies the following
				requirements is required for all MSWLFs:
(1)
				Within the six (6) months following the scheduled date of compliance that is
				specified in section 1(a) of this rule, a minimum of four (4) independent
				background samples from each approved ground water monitoring well must be
				collected and analyzed for the constituents listed in section 15(a) of this
				rule (Table 1A). If a background data base, comprising data from every
				monitoring well approved by the commissioner and every constituent listed in
				section 15(a) of this rule (Table 1A), has been previously established, then
				additional independent samples are not required for the purpose of establishing
				background.
(2) Any ground water
				monitoring well installed after the scheduled date of compliance specified in
				section 1(a) of this rule and designated for detection monitoring must have
				minimum number of independent samples collected and analyzed for the
				constituents listed in section 15(a) of this rule (Table 1A). The minimum
				number of independent samples must satisfy the chosen statistical procedures
				and performance standards under section 6 of this rule.
(3) Subsequent sampling events during the
				active life, closure, and post-closure periods of the MSWLF must include the
				collection and analysis of at least one (1) independent sample from each
				approved ground water monitoring well. These samples must be analyzed for all
				constituents in section 15 of this rule (Table 1A and Table 1B). The detection
				monitoring frequency must be at least semiannual during the active life,
				closure, and post-closure periods.
(4) The commissioner may specify an
				alternative frequency for detection monitoring that must comply with the
				following:
(A) The alternative frequency must
				be no less than annual.
(B) The
				alternative frequency must be based on consideration of the following factors:
(i) Sedimentology of the aquifer and
				unsaturated zone.
(ii) Hydraulic
				conductivity of the aquifer and unsaturated zone.
(iii) Ground water flow rates.
(iv) Minimum distance between the upgradient
				permitted solid waste boundary and the downgradient ground water monitoring
				well screen.
(v) Resource value of
				the aquifer.
(vi) The fate and mode
				of transport of any constituents detected in response to detection
				monitoring.
(vii) Constituent
				concentrations recorded at the date of alternative frequency
				selection.
(5) The owner, operator, or permittee must
				determine, based on the results of sample collection and analysis performed in
				accordance with this subsection, whether any statistically significant increase
				in concentration has occurred for any constituent listed in section 15(a) of
				this rule (Table 1A). In order to make this determination, the owner, operator,
				or permittee must compare the samples to:
(A)
				background ground water quality;
(B) a ground water protection standard that
				has been established from a previous assessment ground water monitoring program
				conducted under section 10 of this rule; or
(C) a ground water protection standard that
				was established under 329 IAC 2-16-10, which was repealed in 1996.