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Table 2

Sample types, locations and volumes at five Ontario WWTPs

Plant	Monthly sampling, n = 12				Matrix spike, n = 1
	Volume filtered, L				Filtered, L	Grab, L
	Pre-disinfection	Location	Post-disinfection	Location	Pre- and post-disinfection	Pre- and post-disinfection
A	100–150	PSF	102–151	Post-UV	110	10
B	50–120	PSC	61–120	Post-UV	80	10
C	105–120	PSF	112–120	Post-Cl₂ CT	110	10
D	31–100	PSC	34–100	Post-Cl₂ CT	45	10
E	50	PSC	36–50	Post-Cl₂ quenching	40, 26*	10

Plant	Monthly sampling, n = 12				Matrix spike, n = 1
	Volume filtered, L				Filtered, L	Grab, L
	Pre-disinfection	Location	Post-disinfection	Location	Pre- and post-disinfection	Pre- and post-disinfection
A	100–150	PSF	102–151	Post-UV	110	10
B	50–120	PSC	61–120	Post-UV	80	10
C	105–120	PSF	112–120	Post-Cl₂ CT	110	10
D	31–100	PSC	34–100	Post-Cl₂ CT	45	10
E	50	PSC	36–50	Post-Cl₂ quenching	40, 26*	10

PSF, post-sand filtration; PSC, post-secondary clarifier; Post-Cl₂ CT, post-Cl₂ contact tank (sodium thiosulfate injected prior to entering filter housing – see the text).

*Pre-disinfection volume = 40 L; post-disinfection volume = 26 L.

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