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Nine air samples were collected on three separate days, including three field blanks, by placing air pumps on workers inside and around the access pit locations for 4-hour periods during CIPP lining preparation and lining activities. This is the only area where the AC pipe was exposed and therefore the only reasonable place where asbestos may be measured in the air. Due to an inadequate volume of air sampled on the first day, only six samples, including two field blanks, were analyzed. Air samples were collected using a personal air sampling pump with an approximate flow rate of 2 liters per minute (LPM). The pumps were calibrated in the field prior to sample collection using a flow calibrator. Table 1 summarizes the readings of air samples collected.

Table 1

Summary of collected air samples

Sample no.Lining run no.Average flow rate (LPM)Run time (min)Volume collected (L)
#5 1.9847 259 514 
#6 1.9822 244 484 
#6 2.0352 280 570 
#6 2.0427 252 515 
Field Blank-2 #5 NA NA NA 
Field Blank-3 #6 NA NA NA 
Sample no.Lining run no.Average flow rate (LPM)Run time (min)Volume collected (L)
#5 1.9847 259 514 
#6 1.9822 244 484 
#6 2.0352 280 570 
#6 2.0427 252 515 
Field Blank-2 #5 NA NA NA 
Field Blank-3 #6 NA NA NA 

NA, not available.

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