12 Va. Admin. Code § 5-590-383 - Organic chemicals compliance
A. When the results of sampling indicate
positive results for contaminants listed in Table 340.2, the owner shall
collect a confirmation sample at the same sampling point within two weeks of
notification of the analytical results of the first sample.
B. The results of the initial and
confirmation samples shall be averaged to determine waterworks compliance in
accordance with subsection C of this section. The department has the discretion
to delete results of obvious sampling errors.
C. Compliance with Table 340.2 shall be
determined based on the analytical results obtained at each sampling point. A
sample result below the detection limit shall be calculated as zero for the
purposes of determining the annual average. If the owner fails to collect the
required number of samples, then compliance (average concentration) shall be
based on the total number of samples collected.
1. For the owner of a waterworks that
conducts monitoring more frequently than annually, compliance is determined by
an RAA of all samples collected at each sampling point. If the annual average
of any sampling point is greater than the PMCL, then the waterworks is out of
compliance. If the initial sample or a subsequent sample would cause the annual
average to be exceeded, then the waterworks is out of compliance immediately. A
sample result below the detection limit shall be calculated as zero for
purposes of determining the annual average.
2. If the owner is conducting monitoring
annually or less frequently, then the owner is not in violation if the average
of the initial and confirmation samples is greater than the PMCL for that
contaminant; however, the owner shall begin quarterly sampling. The owner will
not be considered in violation of the PMCL until one year of quarterly sampling
has been completed and the RAA is exceeded. If any sample will cause the RAA to
exceed the PMCL at any sampling point, then the waterworks is immediately out
of compliance with the PMCL.
Notes
Statutory Authority: §§ 32.1-12 and 32.1-170 of the Code of Virginia.
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