1. The community of Enviro, US (population 26,300) tests its drinking water supply for coliform organisms by the fermentation tube method (five 10 ml portions per sample). The results for January, 2000 are tabulated below: No. of + portions No. of Samples N3TOS 2 4 0 5 25 543210 0 No. of - portions 0 12345

Structural Analysis
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Author:KASSIMALI, Aslam.
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Chapter2: Loads On Structures
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1. The community of Enviro, US (population 26,300) tests its drinking water supply for
coliform organisms by the fermentation tube method (five 10 ml portions per sample).
The results for January, 2000 are tabulated below:
No. of + portions
No. of Samples
2
3
4
0
5
25
543210
No. of - portions
0
1
2
3
4
5
a) Calculate the monthly average MPN.
b) Did the city comply with EPA regulations for sample frequency?
c) Did the samples tested comply with the regulations? What would be considered a non-
compliance?
Transcribed Image Text:1. The community of Enviro, US (population 26,300) tests its drinking water supply for coliform organisms by the fermentation tube method (five 10 ml portions per sample). The results for January, 2000 are tabulated below: No. of + portions No. of Samples 2 3 4 0 5 25 543210 No. of - portions 0 1 2 3 4 5 a) Calculate the monthly average MPN. b) Did the city comply with EPA regulations for sample frequency? c) Did the samples tested comply with the regulations? What would be considered a non- compliance?
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