RCRA ground water assessment plans and annual ground water quality assessment reports at interim status facilities Page: 3 of 6
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The facility owner or operator must develop
this outline within one year of becoming subject to
the groundwater monitoring requirements (see
- Reference #1).
What is the initial step that must be
performed to determine if the facility will
be required to implement a groundwater
quality assessment program?
The first step is for the owner or operator of
the facility to perform a statistical analysis of the
indicator parameters specified in 40 CFR
265.92(b)(3) (i.e., pH, specific conductance, total
organic carbon, and total organic halogens) for
each well in the monitoring system. For this
analysis, the owner or operator must calculate the
arithmetic mean and variance, based on at least
four replicate measurements on each sample, for
each well monitored in accordance with 40 CFR
265.92(d)(2). The samples used in this analysis
must be collected and analyzed for the indicator
parameters semiannually. The results of the
statistical analysis conducted for each well must
be compared with its initial background arith-
metic mean. The Student's t-test at the 0.01 level
of significance must be used to determine statisti-
cally significant increases (or decreases, in the
case of pH) over initial background. (See 40 CFR
265 Appendix IV for a discussion of statistical
methods.) [40 CFR 265.93(3)(b)
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What steps must be performed if the
statistical analyses of the indicator
parameters show a significant change?
If a significant change in the groundwater
quality is revealed by the statistical analyses (i.e., a
significant increase in the contamination of any
parameters, or a decrease in pH), the owner or
operator must perform the following activities:
" For upgradient wells, the facility owner or
operator must annually submit the results of
the statistical analyses in accordance with
40 CFR 265.94(a)(2)(ii) I i.e., the owner or
operator must identify separately any
significant differences from initial back-
ground levels found in the upgradient wells,
in accordance with 40 CFR 265.93(c)(1)].
During the active life of the facility, the
information must be submitted to EPA or
the authorized State no later than March 1
of the following year. 140 CFR
* For down-gradient wells, the owner or
operator must immediately obtain addi-
tional groundwater samples for those wells
in which a significant difference was de-
tected. Samples must be split and then
analyzed to determine if the significant
difference was due to laboratory error. 140
CFR 265.93(c)(2) If the significant
change is determined not to be due to
laboratory error, then within 7 days of
receiving results confirming the significant
change, the facility owner or operator must
States provide written notice to EPA or the
:sponsi- authorized State that the facility's opera-
uct, or tions may be affecting groundwater quality.
[emark, [40 CFR 265.93(d)(1)]
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RCRA ground water assessment plans and annual ground water quality assessment reports at interim status facilities, report, March 1, 1996; United States. (https://digital.library.unt.edu/ark:/67531/metadc664041/m1/3/: accessed June 16, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.