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Table 3

Fecal coliform concentrations in pump chambers following UVD units (in CFU/100 mL)

Nn > LODaMeanSDGMGSDMin25th %Mdn75th %Max
Working 37 23 2,875 10,322 68 13 <10 <10 <10 225 56,000 
Not workingb 10 15,878 47,177 75 40 <10 <10 <10 1,295 150,000 
NAc 36,106 80,504 1,073 13 <10 194 745 11,532 >200,000 
All 53 30 9,091 34,680 95 20 <10 <10 20 541 >200,000 
Nn > LODaMeanSDGMGSDMin25th %Mdn75th %Max
Working 37 23 2,875 10,322 68 13 <10 <10 <10 225 56,000 
Not workingb 10 15,878 47,177 75 40 <10 <10 <10 1,295 150,000 
NAc 36,106 80,504 1,073 13 <10 194 745 11,532 >200,000 
All 53 30 9,091 34,680 95 20 <10 <10 20 541 >200,000 

aNumber of samples with fecal coliform concentrations greater than the LOD (10 CFU/100 mL for most samples).

bUV bulbs classified as not working if UV bulb was off or had high biofilm deposit. Of the observed UVD units, six UV bulbs were off, three UV bulbs were both off and covered with a high biofilm deposit, and one was on with a high biofilm deposit.

cUV bulb status could not be determined.

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