Constituent Council(s):Lane Cove Council

Constituent stream(s):Lane Cove River

Rainfall Station(s):R10

Sewerage Overflows: unknown

Stormwater outlets: 11

Water Quality sampling points: WQ033

Pollution Control Device Numbers: none

Overview:

Landuse:

Period of sampling records: 11th December. 1996 % wet days: 0

Number of sampling occasions (N):1

Compliance of key indicators to guidelines - % of time guidelines met under all conditions.

Summary: Water quality in this sub-catchment is uncertain. Only one sample has been taken. It shows excellent water quality but was taken in dry conditions and is in an estuarine area prone to tidal flushing. It is therefore not an accurate reflection of water quality at this site.

Issues: It would be expected that industrial areas could produce discharges which would pollute waterways. Only one sampling point has been placed in the sub-catchment and measured as part of catchment day 1996. There are a number of stormwater outlets which discharge directly from the industrial area to Stringybark Creek and Lane Cove River which have never been monitored. Lane Cove Council has anecdotal evidence of the starch factory discharging to the Stringybark creek sewer main. Blackman Park is a former council tip site.

Knowledge Gaps: No sewerage information has been collected on this sub-catchment. Apart from the one sample shown above, no water quality sampling has been done in the sub-catchment. The EPA did not identify any licensed polluters from the industrial estate and this information was not available from council.

Recommendations: Water quality monitoring needs to be conducted on the stormwater drains and conducted in wet conditions. In other areas of Sydney, deliberate discharges of pollutants into water courses have occurred in wet weather when the discharge can be disguised and there is a large dilution effect. Further information on sewerage needs to be collected.