Virginia Administrative Code › Title 12 - HEALTH › Agency 5 - DEPARTMENT OF HEALTH › Chapter 590 - WATERWORKS REGULATIONS › Section 12VAC5-590-372 - Inorganic chemicals monitoring

Current through Register Vol. 40, No. 24, July 15, 2024
A. The owner of a community waterworks or a
				NTNC shall conduct monitoring to determine compliance with the PMCLs and SMCLs
				listed in Table 340.1 in accordance with this section. The owner of a TNC shall
				conduct monitoring to determine compliance with the nitrate, nitrite, and
				nitrate-nitrite PMCLs listed in Table 340.1 in accordance with this
				section.
B. If a waterworks draws
				water from more than one source and the sources are combined before
				distribution, then the owner shall sample at an entry point to the distribution
				system during periods of normal operating conditions (i.e., when water is
				representative of all sources being used).
C. When the results of sampling for antimony,
				arsenic, asbestos, barium, beryllium, cadmium, cyanide (as free cyanide),
				chromium, fluoride, mercury, nickel, selenium, or thallium exceed the
				applicable PMCL, the owner shall collect a confirmation sample, at the same
				sampling site, within two weeks of notification of the analytical results of
				the first sample.
D. Monitoring
				frequency.
1. Asbestos. The department has
				granted a statewide waiver for asbestos. If the statewide waiver is removed or
				if site-specific waterworks conditions warrant monitoring for asbestos, then
				monitoring to determine compliance with the PMCL for asbestos specified in
				Table 340.1 shall be conducted as follows:
a.
				The owner of a community waterworks or a NTNC shall monitor for asbestos during
				the first three-year compliance period of each nine-year compliance
				cycle.
b. If the statewide waiver
				is removed, and the owner believes the waterworks is not vulnerable to asbestos
				contamination from either its source water or due to corrosion of its
				asbestos-cement pipe, then the owner may apply to the department for a
				monitoring waiver for asbestos. If the department grants the monitoring waiver,
				then the owner is not required to monitor.
c. The department may grant a waiver based on
				a consideration of the following factors:
(1)
				Potential asbestos contamination of the source water; and
(2) The use of asbestos-cement pipe for
				finished water distribution and the corrosive nature of the
				water.
d. A waiver
				remains in effect until the completion of the compliance period (i.e., three
				years).
e. The owner of a
				waterworks vulnerable to asbestos contamination due solely to corrosion of its
				asbestos-cement pipe shall collect one sample at a tap served by the
				asbestos-cement pipe and under conditions where asbestos contamination is most
				likely to occur.
f. The owner of a
				waterworks vulnerable to asbestos contamination due to its source water shall
				monitor at the entry points.
g. The
				owner of a waterworks vulnerable to asbestos contamination due both to its
				source water and corrosion of its asbestos-cement pipe shall collect one sample
				at a tap served by the asbestos-cement pipe and under conditions where asbestos
				contamination is most likely to occur.
h. The owner of a waterworks that exceeds the
				PMCL as determined in 12VAC5-590-382 A shall monitor quarterly beginning in the
				next quarter after the exceedance occurred.
i. The department may decrease the quarterly
				monitoring requirement to the frequency specified in subdivision D 1 a of this
				section provided the department has determined that the waterworks is reliably
				and consistently below the PMCL. In no case shall the department make this
				determination unless the owner of a groundwater system collects a minimum of
				two quarterly samples or the owner of a waterworks that uses a surface water
				source, in whole or in part, collects a minimum of four quarterly
				samples.