. PROPOSED RULES respoudiuz concentration _ shall not be exceeded: Temperature qin F*) MO ta 7 eee S28 fossa. we. ASA LOGS ee HOO TO Seen TU.7 CoN. ol. TUB COON ee. of (C’) TOM Db PLT V7.7 CLA TOS 11995 CL) When the supplier of water em- {§ 141.21. When the supplier of water ex‘ercises the option provided by this paraplays the membrane filter tecnnique : the coliform (graph ¢b) he shall maintain no less Unan ' pursiaunt to § l4121Ca) densities shall not exceed one per 100 70.3 mg/l free chlorine in the public water } miltililers as the arithmetic mean of all distribution system. Measurements saait i snimples examined per month; and either. be made in accordance with "Standard (i) Four per 100 milliliters in more; Methods," 13th Ed., pp 129-132. e fluoride t { Level Crops) ta OL to Wil. lo PG to 24 TOL fo UB. 4 aa v0 La 1.6 La 4 “than one standard sample when less: § 141.21 The requirements of this paragraph (b) doo hot apply to public water supplies / than 20 are cxamined per month: or i ii} Four per 100 milliliters in more! than five pereent of the standard sam-i ples when 20 or more are examined per. Microhiologien) contaminant anrapolieage and analytical recpuiregre nds, (an) The supplier of water shall musc ; coliform density measurements, for the month. (7270) When the supplier of water cem- | nurpose of determinine complinnes with samples Population served: § 141.15, In accordance with the analytiploys the fermentation tubo method anc. cal recommendations set forth in 10 milliliter standard portions pursuant : § LbL.12 Maxiowint contaminant levels: "Standard Methods for the Examination to § 141,21, coliforms shall not be pres; for organic chemicals. ent In more than 10 percent of the por- t' of Water and Wastewater,” American’ The maximum contaminont level for~ tions in any month; and cither '' Public Health Association, 13th Edition, the tolal concentration of organic chem- (A) Threo or more portions in one:: pp 662-688, exccpt that only a 190 miilileals, as determined by the carbon chlo- sample when less than 20 samples are; liter sample size shall be employcd in : the membrane filter technique. ‘The roform, extract method set forth in: examined per month; or § 141.24(b), ls 0.7 meg/1. ‘ (B) Three or more portions in more! samples shall be taken at points which are representative of the conditions § 141.13 Maximum contaminant levels | than flyg percent of the sampics if 20 ori within the distribution system. moro samples are examined per month. ‘for pesticides. (b) The supplier of water shall take r (ik) When the supplier of water emThe following are the maximum conploys the fermentation tube method and: coliform density samples at regular intaminant levels for pesticides: 100 milliliter standard portions pursu- : tervals throughout the month, anc in (a) Chlorinated Hydrocarbons: ‘ ant to §141.21(a) coliforms shall not be : number proportionate to the population Level mg/t present in more than 60 percent of the}; served by the public water system. In no portions in any month; and either event shall the frequency be less than as Chlordane (cls and trans) (1,2,4,5,; (A) Five or more portions in more | 6.7.8.8 “~- Octachloro - 30.4,5.70: set forth below: than one sample . when less than five!' ° tetrahydro-4,7-methanolidan) . 0.003 Minimum number of = oe serving only educational {nstitutions. Endrin (1,2,3.4,10,10 - Hexachlore-. > 6.7 -~ epoxy - 1,4,40,5,6.7,8.8a- octahydro-l4-endo, e¢ndo-5,8- are examined: or (B) Five or more portions in more 1 than 20 percent of the samples when Cumethano naphtnalene) —- 2-2" 0.00021 five samples or more are examined. Heptachlor —(1,4.5.6.7.8.8-He p ta- —4.7chloro-an4practetrahydro nnoindena) ~,--------.---- Heptochlor Epoxide (1,4,5,6,7,8,8- ‘ tetrahydro-4,7-methanoindan) (4,1,1-Trichloro-2,2- Toxaphene chlorinated (O,,IL,,C1,—Technicat campheno, 67-69% (b) Chlorophenoxys: 24-D (2,4-Dichloréphenoxyacetic acid) ___.-~~.~---~------------ 0.1 - as determined ; § 141.21(f). I, § 141.16 plate by count the standard provided inj Substitution of residual chlo- rine measurement for total coliform measurement, 4 : . (a) The supplier of water may, with ‘the npproval of the State, substitute the Jitnin the distribution system at the The maximum contaminant level of stituted microbiological sample. There pa a eer ieee a lle lc 7 8 & 8,501 to B.400---------------+-=~---== 10 8.401 to 10,300. __--.--~---~----+----- 11 10,301 to 11,100_-_---.---- +--+ ep eeneee 12 io01 to 13700 Te mee me meme 15 not a '500 Pata mere re cw w rsa ene s ee mma ae 13,701 to 14,600____-~----+----------14,601 to 15,500_._..---------..------ 3 16 i7 are representative of the conditions frequency of at least four for each sub- 1550) [0 Didn--n-nnnnoreeconenn 3 19'901 to 19.800.__...--------+-a-.--- 22 10,801 to 20,700._...---.--- beweeneewe 23 20,701 to 21,500_.__.___. ee ee nen nnn ene 24 22,301 to 23,200__-._-_-_--.---------- 26 21.501 to 22,300.__.- Ween eweceneeee ene 25 23-201 to 24,000 _.__----~.---------- 27 turbidity in the drinking water at a rep- shall be at least daily determinations of resentative entry point(s) to the distri- chlorine residual. Measurements shall be F400) 10 Su:008 -----na-recererrnnoe ae —45'591 to 28.000 _......-............ 30 cept that five or fewer turbiclity units the supplier of water exercises the Op- 33,001 to 37,000 ___----------------- 40 37.001 to 41,000 Loe eee enneweren 45. shall maintain no less than 0.2 mg/l! free 46,001 to 50,000 -__.---.-.-.-2------ 2eeni to 93.000weve 38 may be allowed if the supplier of water tton provided in this paragraph (a), he higher turbidity does not: (a) Interfere with disinfection; chlorine in the public water distribution system. 59.001 to 54,000 ._.._-.-.-..-.----..- 60 one to 59,000 ..-------~--+-~----- 65 tive disinfectant agent throughout the 4900 or fewer persons, the supplier may, ~ 79/001 to 76.000 _....-..--..-.-+.--. 80 can demonstrate to the State that the (b) Prevent maintenanceof an effec- distribution system; and (c) Interfere with microbiological determinations. § 141.15 Maximum microbiological con- latinane levela: ee eens : —1g"t91 to 18.900....._.--...--------. 2 bution system is one turbidity unit (TU), made in accordance with “Standard as determined pursuant to § 141.22, ex- Methods,” 13th Ed., pp 129-132. When apm ee es Fn 7.601 to 8500--.-.----------------.-- 5 required to be taken by §141.21(b), pro- Seehaximum contaminant level Y 5,801 to 6,700--.._--.-----.---------- 3 4 15.901 to 16.300.------------------020 18 not. more than 75 percent of the samples vided that the supplier of water takes chiorine residual sampies at points which . 4/101 to 4.900_-...-----------2s------ 2 use of chlorine residual monitoring for 24,5-TP Slilvex (2,4.5-Trichlorophenoxyproplonic acid) -.------- 0. 01 . 3,301 to 4.100.------------aeser-----6.701 to 7,600.-..--.---.~------------ liliter . chlorine) .-.-------------«.--- 0. 005 . 2501 to 3,300....... : 0.0001! bacterial bis {p-methnoxyphenyl] cthane). 0.1 samples per monti. 4/901 to 5800........-0.22 7 1 greater than 500 organisms per one mil-\ cyclohexane, gamma isomer)..._ 0.004 Methoxychlor (b) The supplier of water shall pro-| 25 to 2.500 | vide water in which there shall be no( 0.0001 i Heptachloro - 2,3-cpoxy-3n,4,7,7a~ Lindane (1,2,3,4,5,6-Hexachloro- { ¥ & (b) For public water systems serving with the approval of the State, make a total substitution of chlorine residual 41,001 to 46,000 ___....---...------- 60 55 93'Sor tnegue Te 70 76.001 to 63,000 _......-.-..-------83,001 to 90,000 __.....---------.- a5 90 measurement for the samples required to be taken by § 141.21(b): Provided, That 90,001 to 06,000 1.neenee 95 beops to eeewenn enn e cores ewer eens 109 sidual samples at points which are repre- —y55'591 +6 190000. en 120 the suppiler of water takes chlorine re- 30001 te ap000a tan necenceresnneren MD . {a} The supplicr of water may emPloy onc of two methods to determine sentative of the conditions within the distribution system at the rate of one igo901 te 220,000wo orcenencowcecercccs Lio 929/001 to 250.000._--....------------- 150 contaminant levels. required to be ‘taken.per month-under 290,001 to 320,000_____.___--...------- 170 compliance with the coliform maximum ; of ae per day for cach microblological sample 250,001 to 290,000__.....----_--------- 16n ~ FEDERAL REGISTER, VOL. 40, NO. 51—FRIDAY, MARCH 14, 1975 90fuee 18410 — -