Altona Treatment Plant Monitoring Results

Parameter	Median		90th percentile		Maximum		Number of tests
	Limit	Result	Limit	Result	Limit	Result
Acute toxicity	ns	-	ns	-	0	0	3
Ammonia (mg/l)	6.5	11.0	10	13.4	15	16	52
BOD5 (mg/l)	10	9	20	31	ns	-	52
Cadmium (mg/l)	-	<0.0002	-	<0.0002	-	0.0002	4
Calcium (mg/l)	-	67.5	-	73.9	-	78	12
Chromium (mg/l)	-	0.001	-	0.0018	-	0.002	4
Clarity (cm depth)	-	70	-	100	-	100	51
Colour (Pt/Co) units	-	35	-	44.5	-	50	12
Conductivity (us/cm)	-	7250	-	-	-	7800	52
Copper (mg/l)	-	0.007	-	0.009	-	0.013	4
Dissolved Oxygen (mg/l)	-	4.6	-	12.6	-	14.6	42
e.coli (orgs/100ml)	200	267	1000	689	ns	-	52
Flow (megalitres/day)	16	16	ns	-	30	19	365
Halogenated aliphatic hydrocarbons (micro g/l)	-	0.0005	-	0.2	-	0.006	2
Lead (mg/l)	-	0.002	-	0.0027	-	0.003	4
Magnesium (mg/l)	-	220	-	257	-	270	12
MBAS (mg/l)	-	0.3	-	1.11	-	1.2	12
Mercury (mg/l)	-	0.0002	-	0.0002	-	0.0003	4
Nickel (mg/l)	-	0.0065	-	0.0077	-	0.008	4
Nitrate as N (mg/l)	-	6.1	-	9.6	-	10	52
Nitrite as N (mg/l)	-	0.99	-	1.3	-	1.6	52
Organic nitrogen (mg/l)	-	4	-	6	-	18	52
pH units	6	6.12	ns	-	9	8.59	365
Phosphorus (mg/l)	10	7.3	ns	-	ns	-	12
Sodium (mg/l)	-	1,100	-	1,200	-	1,300	12
Sodium absorption ratio	-	15	-	16	-	16	12
Suspended solids (mg/l)	15	15	30	28	ns	-	52
Total Keldahl nitrogen (mg/l)	-	15	-	17.9	-	49	52
Total nitrogen (mg/l)	20	22	-	ns	-	-	52
Total residual chlorine	ns	-	ns	-	1	0.42	52
Zinc (mg/l)	-	0.024	-	0.0264	-	0.027	4

Note: EPA licence data is in bold. 

"ns" and "-" mean not specified