DURBAN METRO WASTEWATER MANAGEMENT DEPARTMENT

POLLUTION DIVISION

GUIDELINES FOR BUILDING PLANS APPROVAL IN RESPECT OFTRADE EFFLUENT CONTROL AND WATER POLLUTION

PREVENTION IN ORDER TO COMPLY WITH THE DURBANMETRO SEWAGE DISPOSAL BYLAWS OF FEBRUARY 1999

ENQUIRIES:

The guidelines given in this document are intended as a general guideline, formore specific advice please contact:-

3024077 Outer West/Inner West and North Local Council Areas and DurbanNorth of the Umgeni River.

3024685 South Local Council and Queensburgh area and Durban South of theUmgeni River.

January 2002Guideline/Policy

Document No. 11

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I N D E X

PAGE

1. Building Plans approval and Compliance with the provisions of theDurban Metro Sewage Disposal Bylaws

1

2. Floor Drainage requirements for Factories and Warehouses where water-borne sewerage is provided

2

3. Minimum requirements for Floor Drainage and Factories andWarehouses where no water-borne sewerage is provided

3

4. Trade Effluent Sampling Points 3

5. Washbay Design and Drainage 3

6. Storage Areas Design and Drainage 4

7. Bunding 4

8. Service Station Drainage 4

9. Precautionary Stormwater Drainage Pollution Prevention Controls 6

Annexure 1 Sampling Point : Manhole Cover

Annexure 2 Medium Sand Oil and Grease Trap

Annexure 3 Large Sand Oil and Grease Trap

Annexure 4 Modified Open Sand Oil and Grease Trap

Annexure 5 Standard Sand Oil and Grease Trap

Annexure 6 Washbay Design

Annexure 7 Stormwater Pretreatment Trap

Annexure 8 Trade Effluent Sampling Point Design

Annexure 9 Trade Effluent Application Form

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GUIDELINES FOR BUILDING PLANS APPROVAL IN RESPECT OFTRADE EFFLUENT CONTROL AND WATER POLLUTION

PREVENTION IN ORDER TO COMPLY WITH THE DURBANMETRO SEWAGE DISPOSAL BYLAWS OF MAY 1999

1. BUILDING PLANS APPROVAL AND COMPLIANCE WITH THE PROVISIONSOF THE DURBAN METRO SEWAGE DISPOSAL BYLAWS

When submitting a building plan an application for permission to discharge trade effluentinto the Council sewer must be applied for. A Trade Effluent application form can beseen in Annexure 9 or a copy can be obtained by telephoning the Pollution DivisionEnquiries on 3024685 or 3024077.

For information the relevant Section of the Durban Metro Sewage Disposal Bylaws readsas follows:-

“Section 2/3 : Provision of Services to Trade Premises

Any person who wishes to construct or cause to be constructed, a building which shallbe used as a trade premises, shall at the time of lodging a building plan in terms ofSection 4 of the National Building Regulations and Building Standards Act also lodgeapplications for connection to the sewage disposal system and for permission to dischargetrade effluent in terms of section 4/1 of these bylaws.”

Additions to Existing Factory : Review of Existing Drainage and Bunding

Where additions to an existing factory premises are to be made, a written statement fromthe developers Professional Engineer or Responsible Person must be obtained, certifyingthat the bunding and drainage on the premises conforms to National Building regulationsand to the relevant SABS regulations and this must be attached to the plan submission.

Factories that require additional drainage controls

If the factory is to be used for one of the following types of industrial activity or similarthen prior consultation with Pollution Division staff on drainage and pre-treatmentrequirements for inclusion in the drainage plan prior to formal submission is necessary:-

Textile DyeingMetal finishing such as metal plating and anodisingChemical processing and storageFood productionIndustries using large volumes of waterOil processing and handlingPetrol Service Stations

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Failure to comply with the provisions of the Durban Metro Sewage Disposal Bylawrequirements at the time of lodging a building plan could result in unnecessary expenseto retrofit drainage requirements for both protection of the Council Sewage DisposalSystem and protection for preventing pollution of water courses.

2. FLOOR DRAINAGE REQUIREMENTS FOR FACTORIES ANDWAREHOUSES WHERE WATER-BORNE SEWERAGE IS PROVIDED

As a precautionary measure, to prevent pollution of watercourses and public water andin terms of the Durban Metro Sewage Disposal Bylaws : Section 6/4 : Installation ofPretreatment Facility, the Department requires that factory and warehouse floor areas aredrained to the Council foul sewer via a suitably sized pre-treatment trap in order tocontain and separate pollutants prior to discharge. Spillages can be contained in this pre-treatment trap (sand, oil and grease trap) in an emergency.

The installation of such drainage can be done in various ways.

One option is the following:-

The floor is levelled and a channel constructed across the entrance within the buildingin addition thereto, a dished washing area within the building is constructed with aminimum size of 1 x 1 m. Both the channel across the entrance and the dished wash areais connected to an approved sand, oil and grease trap that drains to the Council foulsewer. A water tap must be provided for the dished wash area.

Drainage for Mini Factories

The floor drainage requirements as set out above also apply to Mini factories with theproviso that the internal wash area must be situated away from the reception area.

It is not necessary for each mini factory to have its own sand, oil and grease trap. Asa general rule :-

One standard sand, oil and grease trap per 10 units - Annexure (5)One medium sand, oil and grease trap per 25 units - Annexure (2)One large sand, oil and grease trap per 75 units - Annexure (3)

Washbays for Mini Factories

All mini-factories with ten or more units must have a vehicle washbay conforming withthe washbay requirements as set out in Section 5.

Stormwater Drainage

The recommended stormwater pre-treatment trap for mini factories where the risk ofstormwater pollution is high, is set out in Annexure (7).

3. MINIMUM REQUIREMENTS FOR FLOOR DRAINAGE FOR FACTORIESAND WAREHOUSES WHERE NO WATER-BORNE SEWERAGE ISPROVIDED

No trade effluent is permitted to be discharged into a septic tank. The requirements asset out in (1) and (2) above apply with an additional provision of an effluent conservancytank to accept the discharge of trade effluent from the factory/warehouse wash area.

Please note the developer must obtain written permission to discharge the trade effluent

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from the conservancy tank via a road tanker to a Council facility.

4. TRADE EFFLUENT SAMPLING POINTS

The sample point must be situated in an area which will give a representative sample ofthe industrial final effluent discharged to the foul water sewer. If more than one samplepoint is required written permission must be obtained by telephoning 3024685 or3024077. The sample point must be situated after the pre-treatment system and notcontain domestic sewage and be easily accessible. The design of a sampling point is setout in annexure 8.

For ease of access to the sampling point, a petrol station manhole cover is recommendedfor placement over the sampling point. See annexure 1. The sampling point must beclearly marked as a Metro Trade Effluent and Sampling Point.

5. WASHBAY DESIGN AND DRAINAGE

A drawing of a washbay is shown in annexure 6.

The washing area must be roofed over

The washbay floor must either be surrounded by a kerb not less than 100 mm high orelevated above the immediately surrounding ground level by not less than 200 mm. Should there be rain water ingress due to the height of the roof consideration should begiven to enclosing the sides or alternative acceptable means to exclude stormwater.

The washbay minimum size must be sufficient as to enclose the largest vehicle to beused in the washbay.

The floor of the washbay must be paved with an impervious material and mustconnected to an approved sand, oil and grease trap that drains to the Council foul sewer

6. STORAGE AREAS DESIGN AND DRAINAGE

Refuse Bin Storage

Refuse bin storage areas are to comply with Health Bylaws and National BuildingRegulations Part P Drainage Section P3 (2) and Part U Refuse Disposal.

Waste Skips

The waste skip storage area must be bunded. Where there are a number of skips and oilyresidues are also disposed of in this area then the bunded area must discharge through astormwater pre-treatment trap as set out in Annexure 5 or the skip area must be roofedand the drainage contained.Lubricating Oil Storage

The storage and decanting of oil must be performed in an enclosed roofed and bundedarea with no external drainage. Within this area there should be a sealed pit for collectionand disposal or re-use of spilt oil products.

Waste Sludges Storage

Waste sludges must be stored in a roofed and bunded area with no external drainage.

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Toxic sludges must be stored in a lockable area.

7. BUNDING OF STORAGE TANKS

Tank farms are to comply with SABS standards 089 Part 1.

The bund should be of such dimensions that it contains the volume of the largest tank itserves leaving a freeboard of at least 150 mm. In calculating the bund volume it isnecessary to subtract the volume displaced by the base of the tanks. The calculationshould be shown on the plan.

The bund should be provided with a lockable valve for the release of clean stormwater.This outlet should be flush with the internal ground level.

Provision must be made for the removal of the content of the bund either to sewer or viatanker. This could be done via another lockable valve to the industrial effluent sewer lineor a sump area for collection by tanker.

The bund area should be constructed of a material resistant to/not affected by thechemicals stored in the bund. Alternatively it must be lined with a corrosive resistantmaterial.

8. SERVICE STATION DRAINAGE

Roofed Forecourt Area: New Service Stations

The area under the forecourt roof is a process area and must be drained to the Councilfoul sewer via a sand, oil and grease trap (see Annexure 5). Draining of the forecourtarea to the sand, oil and grease trap must be designed to meet safety requirements.

Area outside Roofed Forecourt Area: New Service Stations

These areas must be shown to be graded to run away from the roofed forecourt area anddrained via a stormwater pre-treatment trap (Annexure 5) before discharging into theCouncil stormwater sewer.

Underground Fuel Tanks

Leak Prevention and Impact Minimisation at Service Stations

� New installations

New underground tanks must comply with:(a) SABS 1535 which requires that the tanks be protected against corrosion

by a 3 mm coating of glass-reinforced polyester (GRP).

(b) SABS 1830 which requires the use of non-corrosive plastic materials inpipework used for conveying petroleum products.

(c) SABS 089 Part 3 requires:

• The installation of observation wells situated around the tanks tofacilitate early warning that a leak has arisen.

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• The provision of a plastic sheet below the tank which slopes towardsthe observation well.

• All pipes (vent, filler and delivery) should slope back to the tank sothat fuel does not remain in pipes. A non-return valve must be fittedclose to suction pump under dispenser to ensure that the deliveryline does not retain product when the pump not in use.

• Tanks are filled from delivery trucks by gravity and not underpressure.

• Shear-off valves are positioned below the dispensers so that nospillage occurs if the dispenser is knocked over.

• Provision of an overfill protection on each tank.

• Installation of containment boxes at filler points.

• Installation of leak detectors on the pressure systems.

• The plan must indicate compliance with the relevant SABSSpecification.

� Recommendations for upgrading of old installations

It should noted that old installations pose a potential threat to the environmentand replacement costs could run into millions of rands. Specific risk preventionmeasures specific to each old tank site, therefore, need to be implemented andshould inter alia include the following:-

• Conduct integrity testing of all old tanks on an annual basis and identifypriority risk prevention measures.

• Instal cathodic protection systems on a programmed schedule.

• Implement an effective inventory accounting system that will ensure fuellosses are timeously identified, reported and resolved.

• Other risk prevention measures identified.

• Identify roles and responsibilities of Petroleum marketing company andService Station operator in risk management of old tanks.

9. PRECAUTIONARY STORMWATER DRAINAGE POLLUTION PREVENTIONCONTROLS

The National Water Act (“NWA”) places a positive obligation on both owners of landand persons who control or occupy land on which any activity or process is, or was,performed or undertaken, which causes, or has caused, or may cause, pollution to a waterresource, to take all reasonable measures to prevent the pollution from occurring,continuing or re-occurring. 1

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1 An update on Environmental Imperatives for DirectorsThe Pollution Liability Steam-Roller by Ian Sampson, Van Onselen O’Connell INC

Therefore:-

Industrial activities that can present a pollution risk must be identified by the applicantbefore submission of plans and ensure that drainage controls are designed andconstructed that will assist in managing the pollution risk. Consultation with thePollution Division prior to formal lodging of building plans is recommended.

Standard stormwater pre-treatment trap

Annexure (7) gives an example of a trap that is suitable for a minimum stormwater pre-treatment system.

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-14-

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ANNEXURE 7

-15-

DEPARTMENT OF

WASTEWATERMANAGEMENT

DURBAN METRO

:D. WILSON

: P. NORTJE

Manager: (Systems)

Checked:

DURBAN METRO WATER SERVICES

Drawn

: N.T.S.

Sheet Rev.

Date

Date

: 14/7/98

:

SketchNo.

Director Waste Water Management

Scales

Designed

Project Title

Area Eng.

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ANNEXURE 8

-16-

POLLUTION DIVISION

APPLICATIONTRADE EFFLUENT SITE DISCHARGE

PERMISSION IN TERMS OF CHAPTER 4/1 OF THE DURBAN METROPOLITAN SEWAGEDISPOSAL BYLAWS TO DISCHARGE TRADE EFFLUENT INTO THE COUNCIL’S SEWER.

I (full name) the undersigned, duly authorised to act onbehalf of and hereinafter referred to as the applicant,hereby apply in terms of Chapter 3/1(1) for permission to discharge trade effluent into the Council’s sewer on thebasis of the facts stated herein, and I submit the following information as required by the Executive Director : MetroWater Services.

PART 1 - Business Details

Nature of the business or industry concerned

Name under which the business or industry is carried out

Name of land owner/landlord

If the business or industry is carried out by a company, the company registration number and the full names of the

directors and secretary must be stated

Address of the business or industry (physical address)

P O Box & Code

Telephone No.

ANNEXURE 9

-17-

Electricity Account Numbers

Water Account Numbers

Date of initial effluent discharge to sewer (anticipated if not available)

Give a brief description of industrial or trade process by which the effluent will be produced. (attach a process

diagram where necessary)

The applicant hereby declares and warrants that:-

The information submitted by him/her in Part 1 are in all respects factually correct.

The discharge of trade effluent will comply at all times with the requirements of the Sewage Disposal Bylaws.

1. I am in possession of a copy of the Sewage Disposal Bylaws and am familiar with the contents.

2. Please include a copy of the Sewage Disposal Bylaws. A nominal charge will be raised.

Signed in by the applicant

This day of

SIGNATURE AND CAPACITY OF APPLICANT

Pollution Officer/Inspector :

Telephone Number :

-18-

Provisional Advice to Accounts Section

Pollution Officer/Inspector

Date: Name of Company

Charge to be raised as percentage of Water Consumption Charges to be raised as Metered Volume

Charge to be raised on Trade Effluent Tankers Charge to be raised on Conservancy Tankers

Charge to be raised by Special Calculation Water consumption <100kΡΡ/month

Average monthly water consumption for previous 12 months as obtained from Accounts Section kΡ/month

Effluent to Sewer Effluent to Outfall

Sewage Works Discharged to

Already on Charge

Sample Point Number Sample Point Description

1

2

3

COMMENTS & ACTION

Attach Inspection Report:

Attach Draft Provisional Permit

Signature: Date:

-19-

CPO

Yes No

Business details complete

Water consumption checked by CPO

Electricity account number completed

Water account number completed

Are all water meters noted

Site specific details checked

Process description completed

Inspection report checked and signed

Draft provisional permit checked

Provisional Regulatory Monitoring Charge Group <100kΡΡ/mth 100-1000kΡΡ/month 1000-10 000kΡΡ/month >10 000kΡΡ/month

Inspection Area P r o v i s i o n a l

Officer/Inspector

Comments to Engineer:

Signature: Date:

Engineer

Comments to CPO/Technician

If percentage water consumption, provisional percentage to be applied

Provisional charge rate to be used

Date from which charge to be raised

Comments to Accounts: Attach Final Signed Provisional Permit

Signature: Date:

-20-

Accounts

Accounts Section Use Only:

Site No. Permit No.

Customer No. Permit Start Date

Monitoring Code Permit Expiry Date

Initial charge Rate Permit Inspection Week

Sample Point No Reg. Mon. Inspection Weeks

Date Signature

Include all information on TES Clerk

Checked Supervisor

Checked Chief Administrator

Sent for Scanning

Filed at Prior Road

Copy to Area Engineer

Application for Site Trade Effluent Discharge.wpd

C:\WINDOWS\TEMP\WaterServices_16204_1.WPD

-21-

POLLUTION DIVISION

TRADE EFFLUENT SITE DISCHARGE

Enquiries: Pollution Officer/Inspector

Tel :

PERMISSION IN TERMS OF CHAPTER 4/1 OF THE SEWAGE DISPOSAL BYLAWS TODISCHARGE TRADE EFFLUENT INTO THE COUNCIL’S SEWER.

PART 2

A. COMPOSITION OF THE EFFLUENT TO BE DISCHARGED

PLEASE CROSS RELEVANT BLOCKS

Cyanide Chromium Nickel Cadmium Copper Zinc

Iron Ammonium Sulphide Sulphates Nitrates Acids

Starch or Sugars Tar or Tar Oil Grease/Oil/Fats

Synthetic Detergents Volatile Solvents Suspended Matter

Alkalis Pesticides/Herbicides Colour

Estimated monthly discharge (kΡ/month)

Maximum rate of discharge (Ρ/sec)

Maximum temperature of effluent (°C)

pH range of effluent

Any other relevant information relating to Quality/Quantity of effluent to be discharged.

-22-

B. PRETREATMENT OF EFFLUENT

PLEASE CROSS RELEVANT BLOCKS

Trade Effluent discharged through connection to foul sewer Effluent discharges to Sand/Oil/Grease

Trap

Neutralising of pH Screening Cyanide Treatment

Precipitation/Flocculation Dissolved Air Flotation Aeration

Mineral Oils Separation Settling Other Treatment

Sampling point available: Yes No

Further details

A. DISPOSAL OF LIQUID WASTES/SLUDGES NOT DISCHARGED TO COUNCIL SEWER

1. Details of processes that generate liquid wastes/sludges not discharged to sewer

____________________________________________________________________________

____________________________________________________________________________

____________________________________________________________________________

____________________________________________________________________________

____________________________________________________________________________

______________________________________________________________________________

2. Chemical content and volume of such wastes/sludges

Type Volume/annum Content

-23-

3. Final disposal of such wastes/sludges

Type Disposal To

D. SITE DRAINAGE

The standard of controls required depends on the type of process and potential impact on watercourses.

YES/NO

1. Complete separation of Stormwater and Trade Effluent drainage exists

2. Dirty Process areas are bunded and separated from clean stormwater areas

3. Stormwater containment tank exists to catch accidental spills and contaminated stormwater runoff from dirty process areas.

4. Washwater from vehicle washing, parts washing etc. drains to foul sewer

5. Boiler and Cooling Tower blowdown drains to foul sewer

6. Chemical/Oil/Used Oil Storage tanks properly bunded.

7. Fuel bowsers/Road tanker loading/drum filling areas are roofed & bunded and drained to foul sewer via sand, oil and grease trap of approved design.

8. All potable water taps drain to foul sewer and not stormwater

Further Details

-24-

PART 3 - Water Balance

FACTS RELATING TO THE CONSUMPTION AND USAGE OF WATER

The following information is required in terms of Section 5(8) and 5(9) of the Sewage Disposal Bylaws forthe purpose of estimating the quantity of trade effluent discharged into the Council’s sewer.

A. Potable Water Meters (installed & read by municipality)

Water Account Number Meter IDNumber

Annual Average Consumption (kΡ/month)

1

2

3

4

5

6

7

8

9

10

Average municipal supply during the annual period from to .

kΡ/month

B. Boreholes

Borehole Meter conversion Factor

Annual AverageConsumption (kΡ/month)

1

2

3

4

5

6

Average supply during the annual period from to

kΡ/month

-25-

C. INTERNAL METERS (private potable water meter read by company)

Meter I.D.Number

Internal MeterConversion Factor

Annual AverageConsumption (kΡ/month)

1

2

3

4

5

6

Average supply during the annual period from to

kΡ/month

D. WATER IN RAW MATERIALS kΡ/month

Total Water In kΡ/month

E. WATER USED BY STAFF FOR DOMESTIC PURPOSES

Allowance(kΡΡ)

kΡΡ/month

1. Day Workers number days per month 0,09/person/day

2. Shift Workers shifts permonth

0,14/person/shift

3. Meals served permonth

number 0,005/meal

4. Watered Garden Area (m²) 0,05/m²

Total Domestic Losses kΡ/month

-26-

F. MANUFACTURING PROCESS LOSSES

Data submitted as representative of the annual period from to

F1. WATER CONTENT OF PRODUCTS MANUFACTURED

Product Volume Produced % Water Content Water Allowance

Allowance kΡ/month

F2. BOILERS

BOILER1

BOILER1

BOILER3

BOILER4

Make of Boiler

Model of Boiler

Steam raised (kg/hour)

Hours steamed per month

Fresh water make-up (kΡ/month)

Water used for coal wetting and ash quenching:(kΡ/month)

Fuel type

Fuel Usage (kg or Ρ/month)

Allowance kΡ/month

F3. COOLING TOWERS

1 2 3 TOTAL

1) Type of Tower

2) Serial No.

3) Model No.

Make-up Water fed to tower kΡ/month

Temperature drop.(° C)

Estimated loss by evaporation kΡ/month

Water re-circulated in kΡ/month

-27-

Please Note: Regarding Cooling Towers

It is imperative that the calculation of the re-circulation rate is done accurately since evaporation fromcooling towers is a significant loss of water in the water balance. If you are uncertain what the correct re-circulation rate is, then please approach the supplier of the cooling tower for the relevant details for thisparticular model of tower. (Attach details). If no correct data can be obtained, then no allowance will begiven.

Allowance kΡ/month

F. OTHER PROCESSES LOSSES

PROCESS DESCRIPTION CALCULATION LOSS CLAIMEDkΡ/Month

1.

2.

3.

Allowance kΡ/month

G. EFFLUENTS NOT DISCHARGED TO SEWER

DESCRIPTION CALCULATION LOSS CLAIMEDkΡ/Month

1

2

3

Please note that allowances for liquid waste removal will only be given for quantities where safe disposalcertificates, as supplied by waste disposal contractors acceptable to Council, are supplied. Copies of suchcertificates must be attached to this application.

Allowance kΡ/month

The applicant hereby declares and warrants that the information and calculations submitted by the applicantare in all respects factually correct.

Signed in ___________________________________________ by the applicant this _____________day

of _________________________________

SIGNATURE & CAPACITY OF APPLICANT

COMPANY : _____________________________

ADDRESS : _____________________________________________________________________

-28-

OFFICE USE ONLY - To be completed by Technician

A. Total Water In kΡ/month

B. Total Domestic Losses kΡ/month

C. Total Manufacturing Process Losses kΡ/month

D. Losses not discharged to Sewer kΡ/month

E. Trade Effluent = A - B - C - D

= kΡ/month

F. Trade Effluent % = E ÷ A = %

-29-

Final Advice to Accounts Section

Pollution Officer/Inspector

Attach Copy of Completed Part 1 & Provisional Advice to Accounts Section

Date: Name of Company

Sample PointNumber

Sample Point Description

1

2

3

Sampler showed sampling points Yes/No Name of Sampler

Minimum of 6 samples taken Yes/No Dates

Obtain charge rate and other informationfor 1 year from Accounts and attach

Comments

Attach Draft Final Permit

Comments:

Signature: Date:

-30-

CPO

Yes No

Draft permit checked

Composition of effluent checked

Pretreatment of effluent checked

Stormwater prevention checked

Safe disposal certificates checked

Sample analysis checked

Final Regulatory Monitoring Charge Group <100kΡΡ/mth 100-1000kΡΡ/month 1000-10 000kΡΡ/month >10000kΡΡ/month

Inspection Area Officer/Inspector

Technician

Yes No

Composition of effluent checked

Pretreatment of effluent checked

Sample analysis checked

Comments on WaterBalance

If metered trade effluent, type and calibration required

___________________________________________________________________________________________

___________________________________________________________________________________________

Comments to Engineer:

Signature: Date:

-31-

Engineer

Comments to Technician/CPO

Comments to Accounts: Attach Final Signed Permit

Signature: Date:

-32-

Accounts

Accounts Section Use Only:

Site No. Permit No.

Customer No. Permit Start Date

Monitoring Code Permit Expiry Date

Initial charge Rate Permit Inspection Week

Sample Point No Reg. Mon. Inspection Weeks

Date Signature

Include all information on TES Clerk

Checked Supervisor

Checked Chief Administrator

Sent for Scanning

Filed at Prior Road

Copy to Area Engineer

Final Part 2 3 4 + Advice to Accounts.nw.wpd

C:\WINDOWS\TEMP\WaterServices_16204_1.WPD