(1) To receive
certification to conduct analyses for antimony, arsenic, asbestos, barium,
beryllium, cadmium, chromium, cyanide, fluoride, mercury, nickel, nitrate,
nitrite, selenium, and thallium the laboratory must:
(a) Analyze Proficiency Test samples provided
by EPA, the Department, or by a Department-approved third party; and
(b) Achieve quantitative results on the
analyses that are within the following acceptance limits:
|
Contaminant
|
Acceptance Limit
|
|
Antimony
|
± 30% at >= 0.006 mg/L
|
|
Arsenic
|
+ 30% at >= 0.003 mg/L
|
|
Asbestos
|
2 standard deviations based on study
statistics
|
|
Barium
|
± 15% at >= 0.15 mg/L
|
|
Beryllium
|
±15% at >= 0.001 mg/L
|
|
Cadmium
|
± 20% at >= 0.002 mg/L
|
|
Chromium
|
± 15% at >= 0.01 mg/L
|
|
Cyanide
|
± 25% at >= 0.1 mg/L
|
|
Fluoride
|
± 10% at 1 to 10 mg/L
|
|
Mercury
|
± 30% at >= 0.0005 mg/L
|
|
Nickel
|
± 15% at >= 0.01 mg/L
|
|
Nitrate
|
± 10% at >= 0.4 mg/L
|
|
Nitrite
|
± 15% at >= 0.4 mg/L
|
|
Selenium
|
± 20% at >= 0.01 mg/L
|
|
Thallium
|
± 30% at >=0.002 mg/L
|
(2) To receive certification to conduct
analyses for the contaminants in 310 CMR
42.20(2)(b), the laboratory must:
(a) Analyze Proficiency Test samples provided
by EPA, the Department, or by a third party with the approval of the
Department; and
(b) Achieve
quantitative results on the analyses that are within the following acceptance
limits:
|
Contaminant
|
Acceptance Limit (percent)
|
|
1,2-Dibromo-3-chloropropane (DBCP)
|
± 40
|
|
1,2-Dibromoethane (EDB)
|
± 40
|
|
Alachlor
|
± 45
|
|
Atrazine
|
± 45
|
|
Benzo[a]pyrene
|
2 standard deviations
|
|
Carbofuran
|
± 45
|
|
Chlordane
|
± 45
|
|
Dalapon
|
2 standard deviations
|
|
Di(2-ethylhexyl)adipate
|
2 standard deviations
|
|
Di(2-ethylhexyl)phthalate
|
2 standard deviations
|
|
Dinoseb
|
2 standard deviations
|
|
Diquat
|
2 standard deviations
|
|
Endothall
|
2 standard deviations
|
|
Endrin
|
± 30
|
|
Glyphosate
|
2 standard deviations
|
|
Heptachlor
|
± 45
|
|
Heptachlor epoxide
|
± 45
|
|
Hexachlorobenzene
|
2 standard deviations
|
|
Hexachlorocyclopentadiene
|
2 standard deviations
|
|
Lindane
|
± 45
|
|
Methoxychlor
|
± 45
|
|
Oxamyl(Vydate)
|
2 standard deviations
|
|
Polychlorinated biphenyls (as
decachlorobiphenyl)
|
0-200
|
|
Picloram
|
2 standard deviations
|
|
Simazine
|
2 standard deviations
|
|
Toxaphene
|
+ 45
|
|
Aldicarb
|
2 standard deviations
|
|
Aldicarb sulfoxide
|
2 standard deviations
|
|
Aldicarb sulfone
|
2 standard deviations
|
|
Pentachlorophenol
|
± 50
|
|
2,4-Dichlorophenoxyacetic acid (2,4-D)
|
± 50
|
|
2-(2,4,5-Trichlorophenoxy)propionic acid (2,4,5-TP)
(Silvex)
|
± 50
|
(3) To receive certification to conduct
analyses for benzene, carbon tetrachloride, 1,2-dichloroethane,
1,1-dichloroethylene, p-dichlorobenzene, 1,1,1-trichloroethane,
trichloroethylene, o-dichlorobenzene, cis-1,2-dichloroethylene,
trans-1,2-dichloroethylene, 1,2-dichloropropane, ethylbenzene,
monochlorobenzene, styrene, tetrachloroethylene, toluene, xylenes (total),
dichloromethane, 1,2,4-trichlorobenzene, and 1,1,2-trichloroethane, the
laboratory must:
(a) Analyze Proficiency Test
(PT) samples provided by EPA, the Department, or by a Department-approved third
party;
(b) Achieve the quantitative
acceptance limits on the analyses performed under 310 CMR
42.20(3)(a) for at
least 80% of the regulated organic chemicals listed at 310 CMR
42.20(3);
(c) Achieve quantitative
results on the analyses performed under 310 CMR
42.20(3)(a) that are within
± 20% of the actual amount of the substances in the PT sample when the
actual amount is greater than or equal to 0.010 mg/L;
(d) Achieve quantitative results on the
analyses performed under 310 CMR
42.20(3)(a) that are within ± 40% of
the actual amount of the substances in the PT sample when the actual amount is
less than 0.010 mg/L; and
(e)
Achieve a method detection limit of 0.0005 mg/L according to the procedures in
Appendix B of 40 CFR Part
136.
(4) To receive certification for vinyl
chloride, the laboratory must:
(a) Analyze
Proficiency Test (PT) samples provided by EPA, the Department, or by a
Department-approved third party;
(b) Achieve quantitative results on the
analyses performed under 310 CMR
42.20(4)(a) that are within ± 40% of
the actual amount of vinyl chloride in the PT sample;
(c) Achieve a method detection limit of
0.0005 mg/L according to procedures in 40 CFR Part
136:
Appendix
B; and
(d) Obtain
certification for the contaminants listed in 310 CMR
42.20(3).
(5) To receive certification for
total trihalomethanes (chloroform, bromodichloromethane, dibromochloromethane,
and bromoform), haloacetic acids (monochloroacetic acid, dichloroacetic acid,
trichloroacetic acid, monobromoacetic acid, and dibromoacetic acid, known
collectively as HAA5), bromate, and chlorite, the laboratory must:
(a) Analyze Proficiency Test (PT) samples
approved by the Department at least once each calendar year by each method for
which the laboratory desires certification;
(b) Achieve quantitative results within the
acceptable limit for each analyte included in each PT sample and, for
haloacetic acids, on a minimum of 80% of the analytes included in each PT
sample. The acceptance limit is defined as ± 20% of the true value for
each of the trihalomethanes; ± 40% of the true value for each of the
haloacetic acids; ± 30% of the true value for chlorite; and ± 30%
of the true value for bromate;
(c)
Report quantitative data for concentrations at least as low as the regulatory
minimum reporting level of 0.0010 mg/L for each of the trihalomethanes, 0.0020
mg/L for monochloroacetic acid, 0.0010 mg/L for dichloroacetic acid,
trichloroacetic acid, monobromoacetic acid, and dibromoacetic acid, 0.020 mg/L
for chlorite, and 0.0050 mg/L for bromate (0.0010 mg/L for laboratories using
EPA Methods 317 Revision 2.0, 326.0 or 321.8);
(d) Use calibration curves for the analysis
of trihalomethanes, haloacetic acids, bromate, and chlorite that encompass the
regulatory minimum reporting level (MRL) concentration. Data may be reported
for concentrations lower than the regulatory MRL as long as the precision and
accuracy criteria are met by analyzing an MRL check standard at the lowest
reporting limit chosen by the laboratory. The laboratory must verify the
accuracy of the calibration curve at the MRL concentration by analyzing an MRL
check standard with a concentration less than or equal to 110% of the MRL with
each batch of samples. The measured concentration for the MRL check standard
must be ± 50% of the expected value if any field sample in the batch has
a concentration less than five times the regulatory MRL. Method requirements to
analyze higher concentration check standards and meet tighter acceptance
criteria for them must be met in addition to the MRL check standard
requirement; and
(e) When adding
the individual trihalomethane or haloacetic acid concentrations in order to
calculate the total trihalomethane or HAA5 concentrations, respectively, use a
zero for any analytical result that is less than the MRL concentration for that
particular analyte.
(6)
To receive certification to conduct analyses for perchlorate, the laboratory
must:
(a) Analyze PT samples approved by the
Department;
(b) Achieve
quantitative results within the acceptable limit for this analyte in each PT
sample. The acceptance limit is defined as the 95% confidence interval
calculated around the mean of the PT study data;
(c) Use analytical methods acceptable to the
Department; and
(d) Comply with
specific Department policies regarding quality assurance/quality control and
data reporting procedures for this analyte.
(7) To receive certification to conduct
analyses for 1,4-dioxane, the laboratory must:
(a) Analyze PT samples approved by the
Department;
(b) Achieve
quantitative results within the acceptable limit for this analyte in each PT
sample. The acceptance limit is defined as the 95% confidence interval
calculated around the mean of the PT study data; and
(c) Use analytical methods, quality
assurance/quality control protocols, and data reporting procedures acceptable
to the Department.
