06/1354 - MCU - Dwelling House & Lot Recon [As Published] · 132006.1354

Ref: 3436 D

however the disposal area size has been calculated using primary
effluent parameters (worst case scenario) given that there are seven
proposed disposal areas in a smail area.

3. DAILY FLOW ALLOWANCES

Population equivalent for 4 bedroom homes is 6 EP (ASNZ1547:
2000). Water use for households with standard fixtures, using water
supplied by onsite rainwater tanks is 140 L/person/day (AS/NZ 1547:
2000).

Daily Design Flow (Q) => 6 EP x 140 Li/p/d so Q = 840 litres/day

4. INVESTIGATION WORKS

All permeability tests were carried out by Bowler Geotechnical, using a
test hole 100mm in diameter and 450mm deep, according to the
method set out in appendix 4.1F of AS1547-2000 ‘On site domestic-
wastewater management’ (Constant Head Method).

The subsurface profile of the site was established by hand augering |
three bore holes spaced evenly throughout the subdivision. Location of
the permeability test pits (TP) and subsurface profile investigations
(PBH) can be seen in Appendix 2 — Site Plan. Please note that lot
numbers and locations are now as per Appendix 2 — Site Plan Job #
3436 C. The locations of all test results herein, have been renamed to
match the current lot numbers

4.1 Sub-Surface Profile

Appendix 3 - Bore Hole Log Sheets, shows the full results of the
sub-surface investigation.

PBHA was drilled in proposed Lot 8

PBHB was drilled in proposed Lot 3

PBHC was drilled in proposed Lot 1

All three boreholes indicated that the entire site could be
classified as Category 1 (Gravels and Sands) or Category 2
(Sandy Loams) as per AS/1547:2000.

4.1. Permeability Test Resuits

As per appendix 4.1E, clause 4.1F6 of AS1547-2000, the
saturated hydraulic conductivity (K.+) of a soil may be
determined by the equation:

Ksa = 4.4Q (0.5sinh"(H/2r)) — V(((r/H?) + 0.25) + r/H)
2nH*
Where:

Effluent Disposal - Pywell