[Federal Register Volume 65, Number 157 (Monday, August 14, 2000)]
[Corrections]
[Pages 49638-49639]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: C0-8155]



  Federal Register / Vol. 65, No. 157 / Monday, August 14, 2000 / 
Corrections  

[[Page 49638]]



ENVIRONMENTAL PROTECTION AGENCY

40 CFR Parts 141 and 142

[WH-FRL-6570-5]
RIN 2040-AD18


National Primary Drinking Water Regulations: Long Term 1 Enhanced 
Surface Water Treatment and Filter Backwash Rule

Correction

    In proposed rule document 00-8155 beginning on page 19046 in the 
issue of Monday, April 10, 2000, make the following correction:
    On pages 19057 and 19058, Table II.7 is corrected to read as 
follows:

                                  Table II.7.--Cryptosporidium Occurrence in Filter Backwash and Other Recycle Streams
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                                                                                                               Number of treatment
      Name/location of study        Number of samples (n)      Type of sample      Cyst/oocyst concentration     plants sampled           Reference
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Drinking water treatment            2....................  backflush waters from  sample 1: 26,000 oocysts/   2...................  Rose et al. 1986.
 facilities.                                                rapid sand filters.    gal (calc. as 686,900
                                                                                   oocysts/100L).
                                                                                  sample 2: 92,000 oocysts/
                                                                                   gal (calc as 2,430,600
                                                                                   oocysts/100L)
Thames, U.K.,.....................  not reported.........  backwash water from    Over 1,000,000 oocysts/     1...................  Colbourne 1989.
                                                            rapid sand filter.     100L in backwash water on
                                                                                   2/19/89.
                                                                                  100,000 oocysts/100L in
                                                                                   supernatant from
                                                                                   settlement tanks during
                                                                                   the next few days
Potable water supplies in 17        not reported.........  filter backwash from   217 oocysts/ 100 L          not reported........  Rose et al. 1991.
 States.                                                    rapid sand filters     (geometric mean).
                                                            (10 to 40 L sample
                                                            vol.).
Name/location not reported........  not reported.........  raw water............  7 to 108 oocysts/100L.....  not reported........  LeChevallier et al.
                                                           initial backwash       detected at levels 57 to    not reported........   1991c.
                                                            water.                 61 times higher than in
                                                                                   the raw water.
Bangor Water Treatment Plant (PA).  Round 1: 1 (8-hour     raw water............  6 oocysts/100L              1...................  Cornwell and Lee
                                     composite).           filter backwash......  902 oocysts/100L..........                         1993.
                                                           supernatant recycle..  141 oocysts/100L..........
                                    Round 2: 1 (8-hour     raw water............  140 oocysts/100L..........  1...................  Cornwell and Lee
                                     composite).           filter backwash......  850 oocysts/100L..........                         1993.
                                                           supernatant recycle..  750 oocysts/100L..........
Moshannon Valley Water Treatment    Round 1: 1 (8-hour     raw water............  13 oocysts/100L...........  1...................  Cornwell and Lee
 Plant.                              composite).           spent backwash.......  16,613 oocysts/100L.......                         1993.
                                                           supernatant recycle..  82 oocysts/100L...........
                                                           sludge...............  2,642 oocysts/100L........

[[Page 49639]]

 
                                    Round 2: 1 (8-hour     raw water............  20 oocysts/100L...........  1...................  Cornwell and Lee
                                     composite).           supernatant recycle..  420 oocysts/100L..........                         1993.
Plant ``C''.......................  11 samples using       backwash water from    continuous flow: range 1    1...................  Karanis et al. 1996.
                                     continuous flow        rapid sand filters;    to 69 oocysts/100 L; 8 of
                                     centrifugation;.       samples collected      11 samples positive.
                                    39 samples using        from sedimentation    cartridge filters: ranges
                                     cartridge filters.     basins during          0.8 to 252/100 L; 33 of
                                                            sedimentation phase    39 samples positive.
                                                            of backwash water at
                                                            depths of 1, 2, 3,
                                                            and 3.3 m.
Pittsburgh Drinking Water           24 (two years of       filter backwash......  328 oocysts/ 100 L          1...................  States et al. 1997.
 Treatment Plant.                    monthly samples).                             (geometric mean); (38
                                                                                   percent occurrence rate).
                                                                                  non-detect-13,158.........
                                                                                  oocysts/100L..............
``Plant Number 3''................  not reported.........  raw water............  140 oocysts/100L..........  not reported........  Cornwell 1997.
                                                           spent backwash.......  850 oocysts/100L..........
``Plant C'' (see Karanis, et al.,   12...................  raw water............  avg. 23.2 oocysts/100L      1...................  Karanis et al 1998
 1996).                             50...................  backwash water from     (max. 109 oocysts/100L)                           (Table 8, p. 14).
                                                            rapid sand filters.    in 8 of 12 samples.
                                                                                  avg. 22.1 oocysts/100L
                                                                                   (max. 257 oocysts/100L)
                                                                                   in 41 of 50 samples.
``Plant A''.......................  1....................  rapid sand filter      150 oocysts/100L..........
                                                            (sample taken 10
                                                            min. after start of
                                                            backwashing).
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[FR Doc. C0-8155 Filed 8-11-00; 8:45 am]
BILLING CODE 1505-01-D