Receiving Water Quality of Sydney¢â‚¬â„¢s Inland and Coastal...
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Performance Assessment Monitoring Program Data Report 2006-07 Receiving Water Quality of Sydney’s Inland and Coastal Waterways © Sydney Water Corporation 2007
This work is copyright. It may be reproduced for study, research or training purposes subject to the inclusion of an acknowledgment of the source and no commercial usage or sale. Reproduction for purposes other than those listed requires permission from Sydney Water Corporation.
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TABLE OF CONTENTS
1 FORWARD 3
2 APPROACH AND METHODOLOGY 4
2.1 Sampling Sites and Method 4
2.2 Data Analysis 4
3 RESULTS 16
3.1 Yearly Variation in Hawkesbury-Nepean River Water Quality (2006-07) 16
3.2 Hawkesbury-Nepean River Water Quality Trend plots (1997-07) 41
3.3 Yearly Variation in Coastal Water Quality (2006-07) 90
3.4 Coastal Water Quality Trend plots (1997-07) 109
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1 Forward This is a data report to summarise the receiving water quality of Sydney’s Inland and Coastal Waterways. The data upstream and downstream of Sydney Water’s Inland Sewage Treatment Plants (STPs) are presented to satisfy Condition M10 of Sydney Water's Environmental Protection Licences. Sydney’s coastal waterways data are also presented to describe general ambient conditions. The report presents the summary of last year’s data (July 2006 to June 2007) in dry weather and wet weather categories. It also included last ten years trend plots for key water quality indices.
The data set used in this report is collected by the Performance Assessment Monitoring Program (PAM). This program is comprised of a number of discrete components, one of which involves sampling upstream and downstream of Sydney Water STPs to assess STP impact on receiving waters. The water quality component of the program involves monthly routine sampling of sites throughout Sydney’s waterways (Hawkesbury- Nepean and tributaries, Port Jackson, Georges River, Cooks River, Port Hacking and Coastal Lagoons) and 3 wet-weather sampling events where rainfall across the catchment exceeds 25mm in a 24 hours period. This report separates dry and wet weather samples based on rainfall data, and provides information on receiving water quality.
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2 Approach and Methodology
2.1 Sampling Sites and Method All water quality sampling sites for various waterways are listed in Table 1 and Table 2. The location of all sampling sites are shown in Figure 1 to Figure 6. All sampling (regular monthly and wet weather response sampling) comprised collecting replicates from each site. Water samples were collected from 0.5m depth where depth of the waterway was sufficient. Field measurements were taken and samples were analysed for the selected water quality variables listed in Table 4.
2.2 Data Analysis The data for the period between July 2006 and June 2007 was used for analysis. Receiving water quality data were separated into dry and wet weather category using catchment weighted rainfalls. Water quality at all these locations is affected by wet weather, either due to runoff from the catchment or input of pollutants from sewer overflows. Wet weather was defined as a day when greater than 15mm of rain had fallen in the previous 72 hours. All other days were dry weather. Relevant rainfall stations used for each site and different section of the river and catchment are shown in Table 3. List of abbreviations used in summary statistics tables are shown in Table 4 and Table 5.
In summary statistics tables, means are geometric means for faecal coliform and enterococci data. In yearly trend plots, the range of data for a year was plotted and the mean of each year connected with a line to show year-to-year changes in the mean. For temperature, the data was plotted as a time series to show seasonal patterns. This data was not separated into wet and dry weather.
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Table 1 Water quality sampling locations upstream and downstream of Inland STPs
Water Ways Site Code Description
E099 Upstream Mt Victoria STP
E0101 Downstream Mt Victoria STP
GS4359 Upstream Blackheath STP
Blue Mountains GS4358 Downstream Blackheath STP
N462 Downstream Winmalee STP
N526 Upstream Glenbrook STP
N525 Downstream Glenbrook STP
N92 Maldon Weir Hawkesbury Nepean River N91 Maldon Bridge (Upper) N78 Upstream Camden STP N75 Downstream Camden STP N57 Upstream Penrith STP N53 Downstream Penrith STP Hawkesbury Nepean River N48 Smith St (Middle) N464 Winmalee Lagoon N42 Upstream Nth Richmond WTP N39 Downstream Nth Richmond WTP N38 Upstream South Creek N35 Downstream South Creek N26 Sackville N18 Leetsvale Hawkesbury Nepean River N14 Wisemans Ferry (Lower) N04 Mooney Bridge N06 Marlowe Creek NB13 Berowra Creek @ Cunio Pt NB11 Berowra Creek Berowra Creek NB43 Upstream Hornsby Heights STP NB42 Downstream Hornsby Heights STP NB83 Upstream West Hornsby STP NB825 Downstream West Hornsby STP NC8 Upstream Castle Hill STP NC75 Downstream Castle Hill STP Cattai Creek NC53 Upstream Rouse Hill STP NC51 Downstream Rouse Hill STP NC5 Annangrove Road NC2 Inflow to Hawkesbury River
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Table 1 (contd) Water quality sampling locations upstream and downstream of Inland STPs
Water Ways Site Code Description
NS090 Upstream Quakers Hill STP NS087 Downstream Quakers Hill STP NS082 Upstream Riverstone STP South Creek NS081 Downstream Riverstone STP NS24 ADI Upstream St Marys STP NS26 Dunheved Golf Course Upstream St Marys STP NS23 Downstream St Marys STP
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Table 2 Water quality sampling locations of other waterways
Water Ways Site Code Description
Manly Lagoon upstream Queenscliff Beach Bridge Manly Lagoon at footbridge in Nolan Reserve
CC01 Curl Curl Lagoon entrance at North Curl Curl Coastal Lagoons DW01 Dee Why Lagoon entrance at Long Reef NL01 Narrabeen Lagoon - Canal entrance u/s of Ocean Bridge NL06 Narrabeen Lagoon - 150m Nth of confluence of South Creek WL83 Wattamolla Lagoon GR01 d/s SWOOS Cooks River CR02 Brighton Avenue Bridge
CR04 Alexandra Canal at Canal Road Bridge
CR06 Wolli Creek
GR09 Woolooware Bay GR18 Salt Pan Creek d/s road bridge
GR20 Lower Prospect Creek at jetty
Georges River GRe12 Lake Chipping Norton
GR22 Liverpool Weir
GR23 Cambridge Ave Bridge
GR24 Ingleburn Reserve
PJ00 Homebush Bay
PJ01 Wilson Park
PJ06 Fig Tree Bridge
PJ07 Sugar Loaf Hill
PJ081 Iron Cove
PJ11 Blackwattle Bay
Port Jackson PJ13 Little Sirius Cove
PJ28 Quakers Hat Bay
PJ32 Davidson Park
PJ33 Rushcutters Bay
PJ34 Duck River
PJ35 Tunks Park
PJLC Lane Cove River Weir
PJPR Parramatta Weir
Port Hacking PH04 Gunnamatta Bay Baths PH05 Maianbar
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Rivers / Creeks Water Sampling Site Settlement Panels Site Intertidal Communities Site SIGNAL Index Site
Hill St Marys
Figure 1 Sampling locations in the Hawkesbury-Nepean River, South, Cattai and Berowra Creek catchments.
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