State of the Bay Report 2010-Final - Anchor Environmental

Anchor Environmental
the beach towards Leentjiesklip 1, Bottom: looking north towards Leentjieklip from
the position where the sea still reaches right up to the rock revetment. .................... 59
Figure 4.14. Coastal erosion at Paradise Beach near Clun Mykonos. ............................................. 60
Figure 4.15. Number and types of vessels entering Saldanha Port from 1994-2010. (Sources:
Marangoni 1998; Awad et al. 2003, Transnet-NPA). .................................................. 63
Figure 4.16. Volumes of ballast water discharge in million tonnes by the different types of vessels
entering Saldanha Port between 1994 and 2010. The data for 1999-2002 is an average
of the total volume of discharge for those years (). (Sources: Marangoni 1998; Awad et
al. 2003, Transnet-NPA)............................................................................................. 63
Figure 4.17. Location of waste water treatment works, sewage pump stations and conservancy
tanks in Saldanha and Langebaan area ...................................................................... 69
Figure 4.18. Monthly trends in the volume of (a) effluent released from the Saldanha WWTW, Apr
2003-February 2011, and authorised total volume per year expressed as a daily limit
(red line) (b) in the numbers of Faecal Coliforms, (c) and Total Suspended Solids, and
(d) Chemical Oxygen Demand in effluent released from the Saldanha WWTW, April
2003-February 2011. Allowable limits as specified in terms of a General Authorisation
under the National Water Act 1998 for graphs b-d are represented by the dotted red
line. 72
Figure 4.19. Monthly trends in water quality parameters (a) Chemical Oxygen Demand, (b)
Ammonia Nitrogen, (c) Nitrate Ammonia, (d) Orthophosphate and (e) Free Active
Chlorine for effluent released from the Saldanha WWTW Apr 2003-February 2011, and
general limits specific under the National Water Act 36 of 1998 (red line on each
graph). 73
Figure 4.20. Monthly trends in the volume of effluent discharged from the Langebaan WWTW in
the period June 2009-February 2011, and allowable limits as specified in terms of a
General Authorisation under the National Water Act 1998 (red line). ........................ 74
Figure 4.21. Monthly trends in (a) the numbers of Faecal Coliforms, (b) Total Suspended Solids, and
(c) Chemical Oxygen Demand in effluent released To from the Langebaan WWTW,
June 2009-February 2011. Allowable limits as specified in terms of a General
Authorisation under the National Water Act 1998 are represented by the red line. ... 75
Figure 4.22. Monthly trends in the volume of Ammonia Nitrate, Ortho Phosphorus and Nitrate
Nitrogen present in effluent from Langebaan WWTW, June 2009-February 2011.
Allowable limits as specified in terms of a General Authorisation under the National
Water Act 1998 (red line). ......................................................................................... 76
Figure 4.23. Spatial extent of residential and industrial areas surrounding Saldanha Bay and
Langebaan Lagoon from which storm water runoff is likely to enter the sea (areas
outlined in white). Note that Note that runoff from the Port of Saldanha and ore
terminal have been excluded as runoff from this site is now reportedly all diverted to
storm water evaporation ponds. Material settling in these ponds is trucked to a
landfill site. ............................................................................................................... 78
Figure 4.24. Location of seawater intakes and discharges for seafood processing in Saldanha Bay
together with location of current and proposed mariculture operations ................... 80
Figure 4.25. Total monthly discharge of fresh fish processing effluent (FFP) disposed to sea by Sea
Harvest 81
Figure 4.26. Allocated mariculture concession areas in Saldanha Bay 2010 ................................... 82
State of the Bay 2010: Saldanha Bay and Langebaan Lagoon 10