The contamination level raised from 2 to TNTC in 100 ml of water as the water becomes access to inhabitants and in the mid inhabitants use water with the contamination of 10 to TNTC fecal coliform.
The microbiological quality of the drinking water becomes much worse at the end of the village having 110 - TNTC fecal coliform in 100 ml water.
In all the villages except Bakirabad the fecal coliform contamination level increased from 30 - 600 cfu as the water becomes in the access of the communities and in the mid it was from 42 - 780 cfu and at the end of the village the contamination level was from 38 cfu to TNTC.
The inhabitants of Chundapa, Skamthang and Hashipee consume water from nallahs and the level of fecal coliform contamination was from 28 - 500 cfu in 100 ml water as it enters into delivery system the contamination increased from 30 -1350 cfu and in the end of the village contamination become very worst having TNTC colonies of fecal coliform in 100 ml drinking water.
Sinakir has zero colonies of fecal coliform in the eye of spring in 100 ml water as this water enters into the delivery system the contamination level abruptly become too much high to TNTC and it was same in the mid and end of the village.
Inside Outside Measures spray zone spray zone (n = 33) (n = 27) Minimum to maximum (CFU/[m.sup.3]) < LOD-> TNTC
< LOD-> TNTC
Percent samples < LOD 15 7 Percent samples > TNTC
18 25 Arithmetic mean (CFU/[m.sup.3]) 739 484 Geometric mean (CFU/[m.sup.3]) 157(a) 175(a) Geometric SD 10 5.8 Abbreviations: LOD, concentration limit of detection (< 10 CFU/[m.sup.3]); TNTC
, too numerous to count (> 1,600 CFU/[m.sup.3]).
Again, sporadic very high levels (TNTC) were found four times for the sponge, and once each for the main light switch, bathroom sink, and mop.
TABLE 5 Number of Samples Passed Based on Proposed Critical Limits for Coliform Bacteria Type of Surface # Samples Pass/Total # Samples 1 CFU/ 2 CFU/ 10 CFU/ [cm.sup.2] [cm.sup.2] [cm.sup.2] Room door handle 9/9 9/9 9/9 Main light switch 8/9 8/9 8/9 Entry carpet 7/9 9/9 9/9 Headboard 8/9 9/9 9/9 Bedside lamp switch 9/9 9/9 9/9 Telephone keypad 8/9 8/9 8/9 TV Remote keypad 8/9 9/9 9/9 Bathroom door handle 9/9 9/9 9/9 Bathroom floor 8/9 9/9 9/9 Bathroom faucet 9/9 9/9 9/9 Bathroom sink 8/9 8/9 8/9 Shower floor 8/9 9/9 9/9 Toilet paper holder 8/8 8/8 8/8 Toilet basin 9/9 9/9 9/9 Mug 2/3 3/3 3/3 Glove FMC * 7/9 7/9 9/9 Mop FMC * 7/8 7/8 7/8 Sponge FMC * 4/8 4/8 4/8 Curtain rod 6/6 6/6 6/6 Note: For the purpose of these calculations, counts of TNTC were replaced with 1,000 CFU/[cm.sup.2].
** = Same sampling point at which TNTC
bacteria were found in samples collected August 2, 1990
The equipment APCs were so high for the first three sample dates that the laboratory increased the dilution to minimize the reporting of "too numerous to count" (TNTC
At this dilution, all before cleaning plates were Too Numerous to Count (TNTC