State of the Bay Report 2011-Final.pdf - Anchor Environmental

State of Saldanha Bay & Langebaan Lagoon 2011
List of Tables
LIST OF TABLES
Table 3.1.
Ranking categories and classification thereof as applied to Saldanha Bay and
Langebaan Lagoon for the purposes of this report. ...................................................... 8
Table 4.1. Summary of major development in Saldanha Bay ...................................................... 13
Table 4.2.
Table 4.3.
Table 4.4.
Table 4.5.
Table 4.6.
Table 4.7.
Table 4.8.
Table 4.9.
Table 5.1.
Table 5.2.
Table 5.3.
Total human population and population growth rates for the towns of Saldanha and
Langebaan from 1996 to 2004 (Saldanha Bay Municipality, 2005). ........................... 15
Projected total human population and population growth rates for the towns of
Saldanha and Langebaan (Saldanha Bay Municipality, 2005). .................................... 15
Mean trace metal concentrations in ballast water (mg/l) and ballast tank sediments
from ships deballasting in Saldanha Bay (Source: Carter 1996) and SA Water Quality
Guideline limits (DWAF 1995a). Those measurements in red denote non-compliance
with the guidelines. ..................................................................................................... 28
General standards as specified under the Water Act 54 (1956) and revised general
limits specified under the National Water Act 36 of 1998. ......................................... 38
Monthly rainfall data (mm) for Saldanha Bay over the period 1895-1999 (source
Visser et al. 2007). MAP = mean annual precipitation. ............................................... 48
Typical concentrations of water quality constituents in storm water runoff
(residential and Industrial) (from CSIR 2002) and South Africa 1998 Water Quality
Guidelines for the Natural Environment (*) and Recreational Use (**). Values that
exceed guideline limits are indicated in red. .............................................................. 49
Characterisation of effluent from Sea Harvest (data for 2001 and 2011) and Southern
Seas Fishing factories (data for 1996/7) (Data from Entech 1996 In CSIR 2002 and
Paul Cloete, Environmental Office for Sea Harvest 2012). SA WQ guidelines are based
on those published in 1998, as the 2009 revised guidelines do not offer
recommended physio-chemical targets except for temperature and pH. ................. 52
Details of marine aquaculture rights issued in Saldanha Bay (source: DAFF pers.
comm. 2011)................................................................................................................ 55
Maximum acceptable count of faecal coliforms (per 100 ml sample) for mariculture
and recreational use .................................................................................................... 60
Sampling site compliance (based on faecal coliform counts) for 10 sites in Small Bay,
5 sites in Big Bay and 3 sites in Langebaan Lagoon. Average faecal coliform
concentration of samples calculated within the 80th percentile limit specified in
South African Water Quality Guidelines for recreational use (100 organisms/100 ml)
for 18 sites. Numbers in black indicate compliance with regulations, while red
numbers indicate non-compliance. “-” indicates that no samples were collected in
that year. (Source: Saldanha Bay Water Quality Forum Trust). .................................. 62
Sampling site compliance (based on faecal coliform counts) for 10 sites in Small Bay,
5 sites in Big Bay and 3 sites in Langebaan Lagoon. Average faecal coliform
concentration of samples calculated within the 95th percentile limit specified in
South African Water Quality Guidelines for recreational use (2000 organisms/100 ml)
for 18 sites. Numbers in black indicate compliance with regulations, while red
numbers indicate non-compliance. “-” indicates that no samples were collected in
that year. (Source: Saldanha Bay Water Quality Forum Trust). .................................. 63
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