Fremantle Port Inner Harbour and Channel ... - Fremantle Ports

will be dynamic. One site will incorporate taking sample water from the weir box itself - this
will only occur if there is safe access to the site. Three samples will occur along the plume
trajectory at distances of 10 m, 200 m and 500 m beyond the silt curtain. The fifth and sixth
sites will be reference sites and located at the Cottesloe Reef Fish Habitat Protection Area
(Figure 3.1).
3.3. Inner Harbour Dredge Plume
Samples will be taken at four monitoring sites along a plume transect at increasing distance
from the dredge head while it is operational within the Inner Harbour, with an example
shown in Figure 3.1 and Figure 3.2. The transect will follow the approximate trajectory of the
plume and therefore will be dynamic. Four samples will occur along the plume trajectory at
distances of 10 m, 50 m, 100 m and 500 m from the dredge head. An additional (fifth) ‘at
source’ water sample will be taken from the dredge ‘tailings’ slurry, prior to deposition within
the reclamation area.
3.4. Offshore Dredge and Disposal Plume
Water samples will be taken at four monitoring sites along a plume transect at increasing
distance from either (i) the dredge head while it is operational within Deep Water Channel or
(ii) the local site of offshore disposal, with an example shown in Figure 3.1. The transect will
follow the approximate trajectory of the plume and therefore will be dynamic. Four samples
will occur along the plume trajectory at distances of 10 m, 50 m, 100 m and 500 m from
either the dredge head or local site of offshore disposal.
3.5. Recreation and Aesthetic Water Quality
As depicted in Figure 3.1, six monitoring locations have been located in the vicinity of
proximal public beaches, for contingency water quality sampling to determine potential
impacts on recreational and aesthetic values:
• Port Beach (‘Sandtracks’ surf break);
• Fremantle Surf Life Saving Club;
• Cottesloe Beach;
• Bather’s Beach;
• South Beach; and,
• Preston Point Beach (in the Lower Swan River).
3.6. Inner Harbour and Rous Head Water, Sentinel Mussel and
Sediment Quality
A total of six locations surrounding the Inner Harbour and Rous Head will be utilised for water
quality monitoring (3 locations), sentinel mussel quality monitoring (all 6 locations) and
sediment quality monitoring (5 locations), as depicted in Figure 3.1, Figure 3.2 and Table 3.2.
Table 3.2
Matrix of Inner Harbour and Rous Head monitoring locations vs. type of monitoring
conducted at each location
Type of
Monitoring
Rocky Bay
(RB)
Fremantle
Port Site 1
(FP1)**
Monitoring Location
Fremantle
Port Site 7
(FP7)**
Rous Head
Harbour
Site 2
(RH2)**
Rous Head
Site 3
(RH3)**
Mussel
Reference
(MR)
Water
Quality
* * *
Sentinel Mussel
Quality
Sediment
Quality
* To be monitored by the Department of Water, with information made available to Fremantle Ports.
** Sites established for Fremantle Ports existing operational Marine Quality Management Program (MQMP).
6 Oceanica: Fremantle Ports: Inner Harbour and Channel Deepening - Water Quality Monitoring Program