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Six pre-lining soil samples were collected from three different excavation pits over 2 days. Each soil sample was collected from the pit walls at two locations around the host pipe (i.e. one near the pipe crown and one near to the pavement surface). Post-renewal soil samples could not be collected due to the paving of access pits after lining, but a change in the soil asbestos content would not be expected since the host pipe is not disturbed during lining. Samples were analyzed using polarized light microscopy in accordance with USEPA Method 600/R-93/116 (USEPA 1993). Samples 1, 2, and 3 also underwent a 400-point count (soil sample analyses in Table 3).

Table 3

Soil sample asbestos results summary

Sample no.Sample locationAsbestos content
Non-asbestos fibrous component (%)Non-fibrous components (%)
MineralVisual estimate (%)
Pipe crown Chrysotile point count: TR < 0.25 TR 100 
Above pipe crown Chrysotile point count: TR < 0.25 TR 100 
Pipe crown Chrysotile point count: TR < 0.25 TR 100 
3 o'clock position NA ND TR 100 
Pipe crown NA ND TR 100 
3 o'clock position NA ND TR 100 
Sample no.Sample locationAsbestos content
Non-asbestos fibrous component (%)Non-fibrous components (%)
MineralVisual estimate (%)
Pipe crown Chrysotile point count: TR < 0.25 TR 100 
Above pipe crown Chrysotile point count: TR < 0.25 TR 100 
Pipe crown Chrysotile point count: TR < 0.25 TR 100 
3 o'clock position NA ND TR 100 
Pipe crown NA ND TR 100 
3 o'clock position NA ND TR 100 

ND, none detected; TR, trace, <1% visual estimate.

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