3018 AppendixC

Whilst every effort has been made to ensure that the borelogs carried out at the subject allotment
are indicative of the soil profile over the site any discrepancy between the profile detailed in the
borelogs and that observed during construction shall be referred to Global Testing for
immediate attention.

INVESTIGATION DETAILS

The investigation carried out at the site included machine augered boreholes up to 2000mm
depth and a series of three permeability test pits located as shown on the attached site report.
All testing carried out was in accordance with Australian Standard 1547 - 2012 “On-site
domestic-wastewater management”.

TEST RESULTS AND CONCLUSIONS (TABLE A1)

 

 

 

 

 

Test No. Soil Slope | Setback Recommended Beavers
Permeability | (m/m) | Distance Design Irrigation | Gardner
(based on test (m) Rate (mm/Day) Setback
results)K** As per AS/NZS Distance

1547-2012

PT1 0.08

PT2 0.07

PT3 0.11

Average 0.08 -20 10* 3 4m

 

 

 

 

 

 

 

 

 

*Minimum setback distance from a watercourse (when an Advanced Secondary ASTP is
recommended) required by Noosa Council Policy.

Determination of Soil Category (Table 5.1 of AS/NZS 1547:2012

 

 

 

Soil Category Soil Texture Structure Indicative Indicative
BH3 Permeability | Drainage class
(k™*)\(m/day)
5 Light Clays Moderately 0.06 to 0.12 Poorly Drained
(00-2000mm) Structured

 

 

 

 

 

 

The Design Irrigation Rate of 3mm/day was adopted from the above results in Table Al.

Noosa Council’s policy suggests that the use of a primary treated effluent disposal system
will be satisfactory provided ;

# Sufficient permeable surface soil overlying rock is present over the disposal area, not

less than 1.2metres depth.

# A suitable soil category material (as per AS1547-2012) is encountered.

# A Minimum set-back distance of 50m is obtained.

# Permeability rates are within the required parameters.
Not all the above requirements have been met, therefore it is concluded that the use of a
primary treated effluent disposal system is not acceptable.

 

Report 21/0611-1 edr page2