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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:
|Name/location of study||Number of samples (n)||Type of sample||Cyst/oocyst concentration||Number of treatment plants sampled||Reference|
|Drinking water treatment facilities||2||backflush waters from rapid sand filters||sample 1: 26,000 oocysts/gal (calc. as 686,900 oocysts/100L)||2||Rose et al. 1986.|
|sample 2: 92,000 oocysts/gal (calc as 2,430,600 oocysts/100L)|
|Thames, U.K.,||not reported||backwash water from rapid sand filter||Over 1,000,000 oocysts/100L in backwash water on 2/19/89||1||Colbourne 1989.|
|100,000 oocysts/100L in supernatant from settlement tanks during the next few days|
|Potable water supplies in 17 States||not reported||filter backwash from rapid sand filters (10 to 40 L sample vol.)||217 oocysts/ 100 L (geometric mean)||not reported||Rose et al. 1991.|
|Name/location not reported||not reported||raw water initial backwash water||7 to 108 oocysts/100L detected at levels 57 to 61 times higher than in the raw water||not reported not reported||LeChevallier et al. 1991c.|
|Bangor Water Treatment Plant (PA)||Round 1: 1 (8-hour composite)||raw water filter backwash supernatant recycle||6 oocysts/100L 902 oocysts/100L. 141 oocysts/100L.||1||Cornwell and Lee 1993.|
|Round 2: 1 (8-hour composite)||raw water filter backwash supernatant recycle||140 oocysts/100L 850 oocysts/100L. 750 oocysts/100L.||1||Cornwell and Lee 1993.|
|Moshannon Valley Water Treatment Plant||Round 1: 1 (8-hour composite)||raw water spent backwash supernatant recycle sludge||13 oocysts/100L 16,613 oocysts/100L. 82 oocysts/100L. 2,642 oocysts/100L.||1||Cornwell and Lee 1993.|
|Start Printed Page 49639|
|Round 2: 1 (8-hour composite)||raw water supernatant recycle||20 oocysts/100L 420 oocysts/100L.||1||Cornwell and Lee 1993.|
|Plant “C”||11 samples using continuous flow centrifugation; 39 samples using cartridge filters||backwash water from rapid sand filters; samples collected from sedimentation basins during sedimentation phase of backwash water at depths of 1, 2, 3, and 3.3 m||continuous flow: range 1 to 69 oocysts/100 L; 8 of 11 samples positive cartridge filters: ranges 0.8 to 252/100 L; 33 of 39 samples positive||1||Karanis et al. 1996.|
|Pittsburgh Drinking Water Treatment Plant||24 (two years of monthly samples)||filter backwash||328 oocysts/ 100 L (geometric mean); (38 percent occurrence rate) non-detect-13,158 oocysts/100L.||1||States et al. 1997.|
|“Plant Number 3”||not reported||raw water spent backwash||140 oocysts/100L 850 oocysts/100L.||not reported||Cornwell 1997.|
|“Plant C” (see Karanis, et al., 1996)||12 50||raw water backwash water from rapid sand filters||avg. 23.2 oocysts/100L (max. 109 oocysts/100L) in 8 of 12 samples avg. 22.1 oocysts/100L (max. 257 oocysts/100L) in 41 of 50 samples||1||Karanis et al 1998 (Table 8, p. 14).|
|“Plant A”||1||rapid sand filter (sample taken 10 min. after start of backwashing)||150 oocysts/100L|
[FR Doc. C0-8155 Filed 8-11-00; 8:45 am]
BILLING CODE 1505-01-D