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Baseline water samples were collected from services immediately downstream of the lining operation also connected to AC mains. Both samples were collected from backflow preventers located above ground in 1-liter HDPE bottles. The samples were analyzed using TEM following USEPA method 100.2 (USEPA 1994) and the results are presented in Table 4. Both samples were found to be non-detected (i.e. asbestos concentration was below analytical sensitivity of 0.03 million structures per liter). The USEPA maximum contaminate level for asbestos in drinking water is 7 million structures per liter.

Table 4

Pre-renewal water sample asbestos results summary

Sample no.Total no. of asbestos structure detectedAnalytical sensitivity (million structures/liter)Total asbestos concentration (million structure/liter)
ND 0.03 BAS 
ND 0.03 BAS 
Sample no.Total no. of asbestos structure detectedAnalytical sensitivity (million structures/liter)Total asbestos concentration (million structure/liter)
ND 0.03 BAS 
ND 0.03 BAS 

ND, none detected; BAS, below analytical sensitivity.

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