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EMI-6 DISCHARGE TO SEWER

 

Technical Clarification

Water calculator

Technical Clarification Number
EMI6-T-OB1-0787

Guidance
2014-05-13

The GBCSA acknowledges the issue raised and approves the project teams approach. However, the GBCSA recommends that the attached calculator be used for the submission.

Supplementary Information

PLEASE SEE BELOW FOR ATTACHMENT TO POTABLE WATER CALCULATOR.

Technical Clarification

Rainwater Harvesting System(s)

Technical Clarification Number
EMI6-T-OB1-0746

Guidance
2014-01-01

A Rainwater Harvesting System is not deemed a water reuse system. Water reuse systems are deemed to be systems that make use of water (greywater and/or blackwater) that has been previously used in the building and reuse it in various permitted applications such as landscape irrigation. As such, with specific reference to a Rainwater Harvesting System(s), no credit compliance documentation such as Tender Hydraulic drawings and specifications are required to prove credit compliance if such a system(s) is included in a project.

 

Technical Clarification

Septic tank and anaerobic digester treatment systems

Technical Clarification Number
EMI6-T-OB1-0395

Guidance
2012-02-03

The application of onsite blackwater treatment systems may contribute to reduced flow of sewage to the municipal sewage system, or may be a necessity where no municipal sewage system is provided.

For the purposes of Green Star SA in the scenario where no municipal sewage system is provided to the project site, septic tank systems or anaerobic digestion systems may only be considered as “blackwater treatment systems” where the effluent emanating from such systems undergoes appropriate treatment (in accordance with applicable Provincial or National requirements) such that it may be discharge into the environment without causing adverse environmental impacts. The direct discharge of effluent from septic tank systems or anaerobic digestion systems into French drains or soak-away fields is not considered best practice nor deemed appropriate treatment for the purposes of Green Star SA. Such treatment methods pose a contamination risk to groundwater and/or watercourses (see Emi-5 Watercourse Pollution).

Where septic tank or anaerobic digestion effluent undergoes appropriate treatment, the inflow to such systems may be entered as a blackwater ‘resource’ in the Wat-1 Potable Water Calculator, permitting projects to claim benefit in the Emi-6 Discharge to Sewer credit for both occupant amenity water efficiency initiatives and onsite blackwater treatment.

Where septic tank or anaerobic digestion effluent does not undergo appropriate treatment, the inflow to such systems must not be entered as a blackwater ‘resource’ in the Wat-1 Potable Water Calculator. In this scenario, projects may only claim benefit in the Emi-6 Discharge to Sewer credit for occupant amenity water efficiency initiatives only, and not onsite blackwater treatment.

 

Erratum

Green Star SA - Office v1 Technical Manual: Page 332

Erratum Number
EMI6-E-OB1-0285

Guidance
2011-08-08

Documentation Requirements, documentation table, Design and As Built sections, delete the bullet points which read "Evidence of approval from the local authority".

 

Erratum

Green Star SA - Office v1 Technical Manual: Page 333

Erratum Number
EMI6-E-OB1-0286

Guidance
2011-08-08

Documentation Requirements, description of documents, delete the paragraph headed "Evidence of approval from the relevant authority…"

 

Technical Clarification

Evidence of approval from the relevant authority

Technical Clarification Number
EMI6-T-OB1-0279

Guidance
2011-06-09

Where rainwater collection or water reuse systems are installed, project teams are no longer required to provide 'evidence of approval from the relevant authority' within their documentation submitted for a Green Star SA Design / As Built rating.

Whilst this documentation is no longer required to be included wihin the submission for Green Star SA certification, the GBCSA would expect that project teams adhere to all relevent authority regulations and requirements (including approval of such systems where required).

 

Credit Interpretation Request

Approval of blackwater systems

Credit Interpretation Request Number
EMI6-C-OB1-0046

Ruling
2009-09-14

The Credit Interpretation Request (CIR) seeking approval for exempting the project from approval from the relevant authority for a blackwater treatment system is granted for this specific project at this point in time. The project must demonstrate in the submission for certification that the project team has worked with the local authority to pursue approval of the system, has designed the system to all applicable SABS, SANS and DWAF standards, and must provide assurance that the system will be installed and used once authority approval is granted. Note that any future requests from other projects for exemption from approval from the relevant authority for a blackwater treatment system will be considered on their merits on a project-by-project basis.

 

 

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