Table 4.8a Action and Limit Levels for E. coli at Monitoring Stations other than WSD Flushing Water Intakes, Gradient Stations and Control Stations (Case 1 and 3)

Parameter (unit)	Monitoring locations	Water Depth	Action Level (cfu/100ml)	Limit Level (cfu/100ml)
E. coli (cfu/100ml)	B10	Geometric mean	610^*	610^*
	B11		610^*	610^*
	B12		610^*	610^*
	B13		610^*	610^*
	B14		610^*	610^*
	B24		61	86
	B25		13	17
	B26		54	61
	B30		6	6
	B31		1	2
	B32		13	25
	B33		3	4
	B34		10	14
	B35		6	9
	B7		414	475
	B8		610^*	610^*
	B9		610^*	610^*
	F1		35	48
	F4		610^*	610^*
	F5		610^*	610^*

Notes:

- For E. coli, non-compliance of water quality limits occurs when monitoring result is higher than the limit levels.

- For conservative assessment, 1 cfu/100ml was adopted as the lowest level in the calculation if the tested result was below reporting limit (<1).

* The Action and Limit Level were set as 95%-tile and 99%-tile of the baseline data if they were lower than the criteria’s level of 610cfu/100ml.