Current through Register Vol. 48, No. 38, September 20, 2024
The supplier must conduct analyses for lead, copper, pH,
alkalinity, orthophosphate, and silica, using the methods in Section
611.611(a).
a) Only a certified laboratory in one of the
categories in Section
611.490(a) may
conduct analyses for lead and copper to demonstrate that a supplier complies
with this Subpart G. To obtain certification for conducting analyses for lead
and copper, a laboratory must fulfill specific conditions:
1) The laboratory must analyze lead- and
copper-containing performance evaluation samples provided by USEPA or the
Agency at least once a year by each method for which the laboratory seeks
certification;
2) The laboratory
must achieve certain quantitative acceptance limits:
A) For lead: ±30 percent of the actual
amount in the performance evaluation sample when the actual amount is greater
than or equal to 0.005 mg/L (the PQL for lead is
0.005 mg/L);
B) For copper: ±10 percent of the
actual amount in the performance evaluation sample when the actual amount is
greater than or equal to
0.050 mg/L (the PQL for copper
is 0.050 mg/L);
3) The laboratory must achieve
method detection limit (MDL) for lead of
0.001 mg/L using the procedures
in 35 Ill. Adm. Code 186 and appendix B to
40 CFR
136: "Definition and Procedure for the
Determination of the Method Detection Limit - Revision
1.11", incorporated by reference
in Section 611.102(c);
and
4) The laboratory must have
current certification to perform analyses under the specifications this
subsection (a) describes.
BOARD NOTE: This subsection (a) derives from
40 CFR
141.89(a) and (a)(1).
b) The Agency must
issue a SEP allowing a supplier to use previously collected monitoring data
under this Subpart G if the supplier collected and analyzed the data complying
with this Subpart G.
BOARD NOTE: This subsection (b) derives from
40 CFR
141.89(a)(2).
c) Reporting Lead and Copper
Levels
1) The supplier must report all lead
and copper levels greater than or equal to the lead and copper PQL (Pb [GREATER
THAN OR EQUAL TO] 0.005 mg/L and Cu [GREATER THAN
OR EQUAL TO] 0.050 mg/L) as
measured.
2) The supplier must
report all lead and copper levels less than the PQL but greater than the MDL
(0.005 mg/L > Pb > MDL and
0.050 mg/L > Cu > MDL)
either as measured or as one-half the PQL in subsection (a) (i.e.,
0.0025 mg/L for lead or
0.025 mg/L for
copper).
3) The supplier must
report all lead and copper levels below the lead and copper MDL (MDL > Pb)
as zero.
BOARD NOTE: This subsection (c) derives from
40 CFR
141.89(a)(3) and
(a)(4).
