Appendix C - Site & Soil Evaluation and Effluent Disposal Report

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[OCR of page images]
Design Irrigation Rate (DIR)

The loading rate that applies to the irrigation of a land application area with effluent of a secondary quality. It is
expressed in L/m?/day or mm/week. If a spray irrigation system is used, the secondary effluent is subject to
continuous disinfection.

Durable Aggregate

An aggregate with the grading requirements specified in AS 2758.1 for single-size course aggregate for nominal
sizes from 20mm - 40mm.

Dry Vault

Commonly known as “composting toilets”, a chamber that receives and treats human and domestic organic
waste using a biological degradation or dehydrating process. The only water used is for cleaning or assisting
the biological degradation process.

Geotextile

Any permeable durable synthetic textile material used with foundations, soil, rock, earth or other geotechnical
engineering related material.

Land Application Area

The designated area of land and reticulation system used for the disposal of the treated effluent.

LTAR

The long term average rate an effluent can be adsorbed into the soil of a disposal system, expressed in litres
per square meter per day. LTAR is dependant on effluent quality, permeability and organic loading.
Permeability

The rate clean water is transmitted through a soil, expressed in meters per day.

Terrace

Where the trenches are in an area where the slope exceeds 15% (approximately 1 in 7) they must be terraced.
Water Reduction Fixtures

Fixtures include 11/5.5 litre water closets, shower flow restrictors, aerator taps and water conserving washing
machines.

Report Limitations:

The log sections in this report should be representative of the soil conditions over this site, however, soil
conditions can change dramatically over short distances. The person responsible for installing the system must
observe the soil profile and ensure it matches the soil profiles recorded in this report. If soil conditions differ
from those recorded by us, we must be immediately notified so that further investigation can be carried out and
the system design modified if necessary. This work may involve additional fees and costs. This company will
not accept any responsibility for additional costs to any party as a result of soil variations.

In writing this report, we have also considered all the information supplied to us by our client. Should the client
or his agent have omitted to supply us with relevant information, our report may be irrelevant and/or
inappropriate. We do not take responsibility for the consequences in such cases and we will make an additional
charge if as a result, more testing or rewriting of this report is necessary.

The operation of the disposal system is dependant upon the hydraulic load, the type of the material entering
the system and the maintenance of the system. As these factors are beyond the control of this company we do
not take any responsibility for the long term adequacy of any disposal system constructed on this site or the
consequences of its malfunction.

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W. Holmes — QBCC - 1120066
For and on behalf of:
AUSTRALIAN SOIL INVESTIGATIONS — QBCC - 15072110

AUSTRALIAN SOIL INVESTIGATIONS Page 6 of 6 ASI Ref: 210480(A)