Post on 31-Jan-2016
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Eradicating Estuary
PollutionPresentation to Section
80 Committee. November 2012.
Regular monthly testing at culverts and places where river systems
enter the estuary indicate consistently high E. Coli counts.
System is flushed by the tides daily so, while we cannot allow the
current situation to continue, it is not too late for remedial action.
How do we know there is a problem?
• Failure to capture pollutants (human and animal faeces, carcasses
of dead animals and other solid waste) in the upper parts of the
catchment;
• Inadequate infrastructure to manage waste in the sewer system
between upper catchment and sewage works;
• Inadequate and outdated sewage works;
• Massive ingress of storm water into sewers exacerbating
infrastructure problems;
• Ingress of other materials that cause blockages;
• Inadequate systems to manage problems.
Main Sources of Pollution
Control What Goes into Rivers and Storm Water
Interventions
Build communal toilets
in informal areas
Improve solid waste
collection and removal
systems
Clean river banks
Plumbing tests at low
cost housing
developments
Audit of connections
(fine and monitor
transgressors)
Keep what should not be in
the river and storm water
systems out of them
Control What Goes into the Sewers
Interventions
Storm water master
plan
Public campaign to
sensitise public
Audit of connections
(fine and monitor
transgressors)
Facilitate processing of
fat from fat traps
Keep what should not be
in the sewers out of them
Fix the Infrastructure
Interventions
R40 million upgrade to
sewage works
Remedial works to
aging sewers and
storm water pipes
New bigger main line
across town
Upgrade critical pump
stations
Install overflow
chambers
Replace and upgrade the
parts of the infrastructure
that are critical
Improve Control Systems
Interventions
Regularly clear and
inspect servitudes and
sewer lines and check
chambers
Enhance telemetry
systems
Dedicated staff to monitor
telemetry system
Install level sensors and
alarms
Risk assessment on
sewage works upgrade
and operations with
standard procedures
Improve incident reporting
Avoid problems where
possible and find out
about them and deal
with them quickly when
they happen
Mitigate where necessary
Interventions
Clean the sludge away
from area next to
George Rex Drive
Establish floating
wetlands
Establish mushroom
beds
Carefully balanced
chlorination of rivers
and storm water
outfalls
Screening of Storm
water outfalls
Use chemical and
biological systems to
purify the water going
into the estuary
Item Priority Number:
Details: Estimated Cost Time Frames Responsible Department
Sludge removal
Remove remaining sludge in Eastern wetland at George Rex Drive.
R 30 000-00-once off. Process complete by end of November 2012.
Environmental Management
River Health Programme
Monthly River clean-ups R 115 200-00 p.a.
From 15/11/12 onwards. Continuous. Monthly.
Environmental Management
Solid Waste Weekly Collection of waste. Will form part of the weekly operational items of Solid Waste Management.
From 12 November 2012. Continuous on a weekly basis.
Solid Waste
Chlorination Chlorinating storm water and River systems
R50 000-00 p.a Programe started 20 December 2011.
Environmental Management.
Floating Wetlands
Install permanent floating wetlands R50 000-00-once off: Wetlands in place by end of February 2013.
Environmental Management
Funded Projects
Item Priority Number:
Details: Estimated Cost Time Frames Responsible Department
Myco-Filtration (Mushroom system)
Experiment with myco filtration. R50 000-00-once off: Systems in place by end of December 2012.
Environmental Management
Cleaning of fat traps.
All fat traps in the CBD area from restaurants, butcheries etc
Call for Proposals. To be financed by successful bidder.
Call for proposal advertised by mid January 2013
Town Planning
Sewer House Connections
Check all properties for illegal connections (sewer to storm water and storm water to sewer).
Issue a R300 000-00 tender.
Tender advertised by mid January 2013
Town Planning
Toilets Install communal water-borne toilets in northern areas
R8 680 131-00 (project has started already).
Complete by end June 2013
Integrated Human Settlements
Funded Projects
Item Priority Number: Details: Estimated Cost Time Frames Responsible Department
Upgrade Knysna Sewer Works (Phase 1)
Mechanical, Electrical and Sludge Dewatering Equipment
R11 403 000-00 (Mechanical, Electrical) R7 685 000-00 (Sludge Dewatering)
Mechanical and electrical commissioned by December 2012. Sludge dewatering by May 2013
Water and Sewer Department
Concordia Sawmill Bulk Services
Create capacity in Heron’s Way
R900 000-00 Commissioned by June 2013 Water and Sewer Department
Telemetry System Service System R55 000-00 Initial Service Contract complete end November 2012
Water and Sewer Department
Upgrade Under Milkwood Drive Pumpstation
Repair pipework and panel
R150 000-00 Commissioned by end November 2012
Water and Sewer Department
Upgrade Pumpstations in Northern Areas
Pipework and Guiderails R 150 000-00 Commissioned by end 30 November 2012
Water and Sewer Department
Totals R29 618 331-00
Shortfall:R380 000.00
Funded Projects
Still to Be Funded Projects
ESTIMATED COSTS FOR ESTUARY POLLUTION MITIGATION MEASURES General Work River System Sewer System Stormwater System Sewer Works
ITEM DESCRIPTION UNIT QTY RATE AMOUNT O&M Planning Current Yr Capex Yr1 Capex Yr2 Capex Yr3 Capex Yr4 Capex Yr5
1 Water Quality Sampling and Testing mnths 1 34 250.00 34 250
2 Clear Servitudes and Check Chambers mnths 1 33 900.00 33 900
3 Telemetry Systems 161 600.00 161 600
4 Pipeline- and Route Inspections and Reporting mnths 12 28 500.00 342 000
5 Illegal Connection Audits mnths 12 27 000.00 324 000
6 Community Environmental Workshops Sum 1 100000 100 000.00 100 000
7 Portable Level Sensors and Alarms Sum 4 20000 80 000.00 80 000
8 Remedial Work and Upgrading of Sewerage Infrastructure 23 893 942.93
8.1 New Rising Main to Main Sewage PS Sum 1 4 701 124.84 200 000 1 000 000 3 501 125
8.2 New Salt River or Hedge Street PS Sum 1 4 914 193.09 2 000 000 2 914 193 0
8.3 CBD main Western Sewer (trenchless) Sum 1 8 750 000.00 8 750 000
8.4 Remedial Work to Old Place, Hornlee, Khaylethu Outfall Sewers Sum 1 2 028 625.00 900 000 1 128 625
8.5 Main Sewage PS Upgrade Phase 2 Sum 1 3 000 000.00 3 000 000
8.6 Condition Assessment of Sewage Network_CCTV (5x) Sum 1 500 000.00 500 000
9 Remedial work to Problem and Ageing Stormwater Pipelines Sum 1 1 000 000.00 1 000 000
10 Wetland and Reedbed Investigation Sum 1 300000 300 000.00 300 000
11 Overflow Chambers at Sewage PS's 660 000.00 105 600 132 000 132 000 132 000 79 200 79 200
12 Sanitation Facilities in Informal Areas Sum 1 200 000.00 200 000
13 Compile Catchment, Stormwater and River Mngmnt Strategy Sum 1 180 000.00 180 000
14 Compile (update) Stormwater Masterplan Sum 709 350.00 709 350
15 Regular Cleanup Programmes for All Watercourses mnths 12 28 500.00 342 000
16 Upgrade the SBR Unit 9 438 000
17 Investigate to relocate Knysna Sewer Works 500 000
TOTALS (Excl. VAT) 1 237 750 1 789 350 10 035 600 4 260 625 12 684 193 1 632 000 6 580 325 79 200
CATEGORY TOTALS (Excl. VAT) O&M Planning Current Yr Capex Yr1 Capex Yr2 Capex Yr3 Capex Yr4 Capex Yr5
General
Rivers System 324 000 400 000 200 000 0 0 0 0 0
Sewer System (Including the sewer works) 571 750 500 000 9 835 600 3 260 625 12 684 193 1 632 000 6 580 325 79 200
Stormwater System 342 000 889 350 0 1 000 000 0 0 0 0
Estimated Totals 1 237 750 1 789 350 10 035 600 4 260 625 12 684 193 1 632 000 6 580 325 79 200
Total Estimated Cost for Project 38 299 043
A) That Council notes the contents of the report as well the report from
the consultants, Royal Haskoning DHV (SSI);
B) That Council makes an in principle commitment, subject to the
availability of funding, to commit the required resources to the extent of
at least R38 299 043.00 over the next 5 years to the permanent
reduction of pollution in the estuary to within acceptable norms.
C) That Council instructs the Municipal manager to include all the items in
projects in table 2 in the Draft Medium Term Revenue and Expenditure
Framework starting from the 2013-2014 financial year;
Recommendations
D) That Council instructs the Municipal Manager to include the projects in the
draft adjustment budget for 2012-2013 to cover the projects shortfall of
R380 000.00 for the current year; this shortfall to be financed from either
additional operating revenues identified during the Adjustments Budget or,
should additional revenues not be available, then savings be identified
within other operating projects and/or repairs and maintenance; and that
Council commits itself to support this element of the Adjustments Budget;
E) That Council supports the call for proposals for the cleaning of fat traps in
the CBD
Recommendations (Continued)
F) That Council supports the investigations into the relocation of the
Knysna Waste Water Treatment Works;
G) That council mandates the Municipal Manager to apply to the following
institutions for further funding: The Department of Human Settlements;
The Danish International Development Agency, Department of Water
Affairs, Department of Environmental Affairs and any other available
source of funding for the projects.
Recommendations (Continued)