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

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Table 4.7 Toxicants in sediment - indicators, trigger levels (where applicable; see Section 4.3) and areas of application (cross-reference with Figure 3.1). Indicator Ecosystem Health Trigger Levels Detection Limit Water, Mussel, and Sediment Quality Sites Metals mg/kg dry weight mg/kg dry weight Ecosystem Health Arsenic 20 0.5 Cadmium 1.5 0.1 Chromium 80 0.2 Copper 65 0.2 Lead 50 0.2 Mercury 0.15 0.01 Nickel 21 0.2 Silver 1 0.2 Zinc 200 0.2 Organotins µg Sn / kg dry wt µg Sn / kg dry wt Tributyltin 5 0.05 Dibutyltin ¥ N/A 0.05 Monobutyltin ¥ N/A 0.05 Organochlorine Pesticides µg/kg dry weight µg/kg dry weight Dieldrin 0.02 1* Endrin 0.02 1* gamma-BHC (Lindane) 0.32 1* trans-Chlordane 0.5 1* cis-Chlordane 0.5 1* Oxychlordane 0.5 1* Heptachlor N/A 1 p,p-DDE 2.2 1 p,p-DDD 2 1 p,p-DDT 1.6 1 Total DDT+DDD+DDE N/A 1 Total Organochlorine Pesticides N/A 1 Polycyclic Aromatic Hydrocarbons µg/kg dry weight µg/kg dry weight Naphthalene 160 10 Acenaphthylene 44 10 Acenaphthene 16 10 Fluorene 19 10 Phenanthrene 240 10 Anthracene 85 10 Total Low Weight PAHs 552 10 Fluoranthene 600 10 Pyrene 665 10 Benz(a)anthracene 261 10 Chrysene 384 10 Benzo(a)pyrene 430 10 Dibenz(ah)anthracene 63 10 Total High Weight PAHs 1700 10 Total PAHs 4000 10 Polychlorinated Biphenyls µg/kg dry weight Total PCBs 23 10 ¥ - Reported for information, but no management actions are directly triggered, since there are no guideline values. * - Detection limit higher than trigger level. 18 Oceanica: Fremantle Ports: Inner Harbour and Channel Deepening - Water Quality Monitoring Program
5. Monitoring Process, Schedule and Contingency Management Measures 5.1. Water Quality Water quality monitoring and management response triggers provide a mechanism to manage impacts to environmental, recreational and aesthetic values associated with water quality and provide an early warning of potential impacts. 5.1.1. Ecosystem Health Values LAC monitoring for Seagrass and Coral Health Frequency • Continuous logging (every 15 minutes) of light starting one week prior to dredging (baseline) and then until completion of dredging and disposal. Recorded light data will be downloaded from loggers each fortnight. Location • Twenty-six locations overlying seagrass and two locations overlying coral (plus one site in Rocky Bay for contextual purposes) as detailed in Sections 3.1, 3.6 and Figure 3.1. • Monitoring will be targeted and focussed on data collection at those sites within proximity of the visible plume/s (as based on field observation and aerial imagery), which technically defines the potential zone of influence, plus associated reference sites. That is, not all sites will be sampled for the full duration of the dredge program and when dredging, only those sites within the proximity of the visible dredge, disposal and/or return water plumes will be sampled, plus associated reference sites. Method • Calculate LAC from underwater light intensity measured by two light loggers deployed at each location with at least 2 m of vertical separation. • LAC will be processed for each location (within 72 hours from collection of all light loggers) and presented as a 14-day rolling median. • For contextual purposes TSS concentration will also be determined at each location by collection of a single integrated-depth water sample, sent to a NATA-accredited laboratory for analysis of the concentration and determination of the organic component via loss on ignition (LOI). • For contextual purposes a profile of turbidity (NTU) will also be measured at each location. • For contextual purposes, temperature loggers will be deployed at both coral monitoring sites, for fortnightly download. • Median LAC will be compared to LAC triggers described in Section 4.1.1 – Light requirements for Seagrass and Coral Health, to determine the appropriate management response as listed below. Contingency Management Measures No exceedance • Where LAC is determined to be below “No exceedance” trigger levels at seagrass and coral health monitoring sites, the lack of exceedance will be noted in fortnightly reporting (by the Environmental Monitoring Contractor) to Fremantle Ports and the Office of the EPA. Regional exceedance • Where LAC is determined to be above the “No exceedance” trigger levels at seagrass and coral health monitoring sites, exceedances in the first instance will be investigated to determine whether the dredging and spoil disposal activities were responsible (wholly or in part) for observed elevations of turbidity. Investigations of possible causes will examine: o o Whether any similar trends were observed at reference sites; The location of the dredging and spoil disposal activities in relation to the affected site(s); Oceanica: Fremantle Ports: Inner Harbour and Channel Deepening - Water Quality Monitoring Program 19
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Page 11 and 12: 1. Introduction 1.1. Scope of this
Page 13 and 14: 2. Environmental Values and Objecti
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Page 38 and 39: at the same distances of separation
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Page 44 and 45: • Date of analysis and name of te
Page 46 and 47: 8. References ANZECC / ARMCANZ 2000

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