JGO.N00. Lee eee eee
410,000, 0.-Lll
450,000.00. 2000-S00,N00 ...0 0 Leelee
S40.000._. wee ele
ino
149
200
210
220
§50,001
600,001
toa GO) 000.2 LLL eee 230
to GUO,000,...0--.--- 0-2 ee 240
660,001 to TO0.000_ 2 eae 250
720,001 to TRO,OU0 LULL ee
780,000 to 840,000___. ~~
$40.00: to 910,000..-..--.--- ee
910,001 to O70.000_..0..-.-.-.--2.--~
260
270
280
290
970.001 to 1,050,000 ...0....2- 22 ee 100
1.050.001
to
Lida n00.. Lee J10
1,920,001
to
140,000.20... .0. 0. ewe eee 340
1,630,00f
1,790,001
1,850,001
to 1,730,000.....-- 00-22 Le 370
to 1,850,000_.....-..2... duewee 380
to 1,970,000. -_......----.---- 390
2,060,001
to 2.270,000_....-.02 22 eee eee 410
2,510,001
to 2,750,000.......-- -.- -4--n 430
3,620,001
to 3,960,000_._.--...__ 2 oe 470
1,140,001 to £250,000... 20.222 320
1,230,001 to 1,920,900....00.-0- 22k 390
1,420,00t to 1,520,000_....-.02 0-2. wee 350
1.820,001 to 1.630,000_..0....-002-22 68k 360
1.976.001 to 2.060.000..-...-...---..--. 400
2,270,001 to 2,510.000__.--..-- 420
2.750.001 to 3.020.000_-.---_--___ Lk 440
3,020.001 to 3,320,000_._.---- 450
3,320,001 to 93,620,000_..---2.- 2 460
3,960,001 to 4,310,000..-_--._--_-_.- Lee 480
4,910,001 to 4.690,000___.--.-. LLL. 490
24,690,000
Joie elle 500
(c} (1) When the coliform colonies in a
single standard sample exceed four per
100
milliliters
(¢§ 141.15(a)(1)),
dally
samples shall be collected and examined
from the same sampling point until the
results obtained from aot least two consecutive saniples show less than one coliform per 100 milliliters.
;
(2) When organisms of the coliform
froup occur in three or more 10 ml portions of ao single standard sample
(§ 141.15(a) (2) (1) ), daily samples shall
be coliected and examined from the same
sampling point until the results obtained
from at least two consecutive sampics
show no positive tubes.
(3) When organisms of the coliform
group occur in all five of the 100 ml portions of a single standard sample
(§ 141.15¢(a) (2) iid), daily samples shall
be collected and cxamined from the same
7 sampling point until the results obtained
from at least two consecutive samples
show no positive tubes.
(4) The location at which the check
sample was taken pursuant to paragraphs (c) (1), (2) or (3) of this section
must not be eliminated from future sampling because of a history of questionable
water quality, Check samples shall not be
Included in calculating the total number
of samples taken each month to determine compliance with § 141.15.
(d} When a particular sampling point
has been confirmed, by the first check
Sample examined as directed in para-.
graphs (c) (1), (2), or (3)' of this scction, to be in non-compliance with the
maximum contaminant levels set forth
in & 141.15, the supplier of water shall
notify the State as prescribed in § 141.31.
(e) When the maximum contaminant
- levels set forth in paragraphs (a) (1) or
(2) of § 141.15 are exceeded as confirmed
by check samples taken pursuant to paragraphs (c) (1), (2), or (3) of this sec-
sninples shnil be annlyzed in accordance
inant
level,
he
shall
analyze
for
the
other than community water systems
lated oh & one-month moving average
basis and reported pursuant to § 141.31.
presence and quantity of that contaminant at feast once per month foliowine
“Standard Mcthods for tho Examination
the initial analysis or information. If,
of Water and Wastewater,” American
Public Health Association, 13th Edition, after conducting monthly testing for a
period of at least one year, the supplier
pp 660-G62. Samples taken for the purpose of plate count annlysis shall be col-. of water demonstrates to the satisfaction
lected at points which are representative: of the State that the level of such conof conditions wilhin the distribution sys-. taminant is stable and duc to a natural
tem ot a frequency at least equal to 10 condition of the water source, he may repercent of the {requency for coliform an-. duce the frequency of analysis for that
alysis as direcled in paragraph (b) of contaminant consistent with the requirethis section with the exception that at ments of paragraph fa) of this section.
(c) If the supplier of water determines
least one sample shall be collected and
or has been informed by the State that
analyzed monthly,
.
te the level of any contaminant listed in
'g 141.22 “Turhidity sainpling and ana- § 141.11 excceds the maximum contamlytical requuircnients.
inant level for the substance, ne shalj
confirm such determination or informa(a) Samples shall be taken at @ representative entry point(s) to the water tion by repeating the analysis within 24
distribution system at feast once per hours following the initial analysis or information, and then at least at weekly
day (at least once per month for supintervals during the period of time the
plies using water obtained from undermaximum contaminant level for tnat
ground sources) for the purpose of making turbidity measurements to determine substance has been exceeded, or until a
monitoring schedule as a condition to a
compliance with § 141.14. The measurevariance, exemption or enforcement acment shall be made in accordance
with the recommendations set forth in tion shall become effective. The results of
“Standard Methods for the Examination _such repetitive testing shall be averaged
of Water and .Wastewater.” American and reported as prescribed in paragraph
(d) of this section.
Public Health Association, 13th Edition,
(d) To judge the compliance of a pub‘pp. 350-353 (Nephelometric Methad).
lic water system with the maximum con(b) In the event that such measuretaminant levels listed in § 141.11, averment indicates that the maximum allowable limit has been excecded, the sam- ages of data shall be used and shall be
pling and measurement shail be repeated rounded to the same numberof signifiwithin one hour. The results of the two cant figures as the maximum contammeasurements shall be averaged, and if inant level for the substance in question.
the average confirms that the maximum Each average shall be calculated on a
allowable limit has been exceeded, this past 12-month moving average basis if
average shail be reported as directed in less than twelve samples per year are
§ 141.31. If the monthly average of all analyzed, and on a past three month
samples exceeds the maximum allowable moving average basis if twelve or nore
limit. this fact shall be reported as di- samples per year are analyzed. In cases
where the maximum contaminant level
rectedin § 141.32(a).
has been exceeded in any one sample, the
{ec} The requirements of this § 141.22
shall not appiy to public water systems average concentration shall be calcuwith, the recommendation set forth in
which use water obtained from underground sources.
§ 141.23 Inorganic chemical sampling
* and analytical requirements.
(a) (1) To establish an initial record
of water quality, an analysis of substances for the purpose of determining
comptianee with § 141.111 shall be com-
picted for ali community water systems
utilizing surface water sources within
one year following the effective date of
this subpart. This analysis shall be repeated at ycariv intervals,
(2) An analysis for communtiy water
systems utilizing ground water sources
If the mean of the samples comprising
the one month moving average exceeds
the maximum contaminant level, the
supplier of water shall give public notice .
pursuaritto § 141.32(a).
(e) The provisions of pararraphs {c)
and (cd) of this scction notwithstanding,
compliance with the maximum contaminant level for nitrate shall be determined on the basis of individual analyses
rather than by averages. Wien a level
exceeding the maximum contaninant
level for nitrate is found, the analyses
shall be repeated within 24 hours. and if
the mean of the two analyses exceeds the
bk
FEOERAL REGISTER, “YOL.
—“30104 no
40, NO.
S1.--FRIDAY, MARCH 14, 1975
ee
to
to
to
to
to
mee He
320.001
960,001
410,001
450,001
500,001
tion, the supplicr of water shall report * shall be completed within two years fol- lowing: the effective date of this subpart,
ns directed in § 14L.42¢q),
(2) When a particular sampling point . This analysis shall be repeated at threehas been shown to be in non-compliance year intervals.
(3) Analyses for public water systems
with the requirements of § 141.16, water
from that location shall be retested olher than community water systems,
within one hour. If the non-compliance Whelher supplied by surfare or pround
is confirmed. the Slate shall be notified water sources, shall be compicted within
ns prescribed im $141.31. Also, if the six years following the cffective date of
non-compliance is confirmed, a sample. this subpart. These analyses shail be repeated at five-year intervals.
for coliform analysis must be immeci(b) If the supplier of water determines
ately collected from that sampling point
and the results of such analysis reported or nas been informed by the State thar
the level of any cantaminant is 75 perto the Stata,
(gf) Standard bacteria plate count cent or more of the maximum conlam-
ee ee ee ee mee
saniptes per montit
ee ie ee
Minimum number of
tm ee
Population sertcd:
aed
PROPOSED RULES
11996