132006.268.03 - Amended Court Approval - Attachment 2

(Foey future-plus
ENVIRONMENTAL

4377-131119-1.0

 

3.0 EFFLUENT QUALITY AND QUANTITY

3.1 ASSESSMENT OF SOIL AND GROUNDWATER CONDITIONS

The soil and percolation test results indicate that the soils at the site are relatively
impermeable but is however still suitable for on-site sewage treatment and effluent disposal.
Groundwater or seepage was not observed within the boreholes carried out during the recent

site investigation.

Given the relatively poor permeability of the site soils and the presence of medium to heavy
clay soils which are more representative of Category 6 soils, the on-site wastewater
assessment for this site is based on Category 6 soils although the Borehole logs indicate the

presence of Category 5 top soils.

3.2 SYSTEM SELECTION
In order to minimise potential impacts on local water quality and to maximise the potential

reuse of treated effluent, it is recommended that all wastewater generated from the
development be treated to a minimum secondary standard. It is understood that all wastewater
generated from the dwelling and factory office facilities will be diverted to the existing septic
tank located geographically downslope of the waste generating facilities. It is proposed that
the existing septic tank will be converted to a pump station, with all collected wastewater to

be pumped to a STP capable of treating the wastewater to a minimum secondary standard.

Typical quality criteria for secondary and advanced secondary treated effluent nominated in
the Department of Infrastructure and Planning, Queensland Plumbing and Wastewater Code

are summarised in the following table:

Table 1: Quality Criteria for Secondary and Advanced Secondary Treated Effluent
Advanced Secondary

  

Teter a aCe OU

 

 

 

 

 

 

 

 

 

BEE Le re WCE
pocebiable Ent Acceptable Limit
Suspended Solids mg/L
BODS5 mg/L 20 10
Faecal Coliforms cfu/100mL 200 10
February 2014 Site & Soil Evaluation Report 6

Wastewater Treatment and Effluent Disposal
314 Cooroy Mountain Road, Cooroy Mountain