Appendix E - Wastewater Report

                             PROPOSED RESIDENTIAL SUBDIVISION
                             9A JIRRIMA CRESCENT, COOROIBAH


1.0      INTRODUCTION
This report details the results of a geo-environmental investigation undertaken to address the feasibility of
on-site effluent disposal for a proposed residential subdivision at 9A Jirrima Crescent, Cooroibah. The
investigation was performed by Tectonic for Maud Cazot in accordance with proposal P20475-Rev0, dated
7 October 2020. Murray & Associates (Qld) Pty Ltd (Murray) are the town planners for the project.
Site investigation comprised a walk-over by an experienced environmental scientist and drilling of one hand
augured borehole in the vicinity of open space expected to be utilised for on-site land application on
proposed Lot 1. This report summarises the results of the investigation and includes a site-and-soil
evaluation for on-site land application of treated sewage. Recommendations are provided regarding the
construction, sizing and positioning of required sewerage treatment plant and effluent disposal areas,
confirming the feasibility of onsite wastewater treatment for the proposed lot reconfiguration.


2.0      SITE DESCRIPTION
The existing property is legally described as Lot 101 on SP168041 and covers an area of approximately
4.5 ha. The existing allotment is generally trapezoidal in shape, with an approximate 200 m handle access
driveway to Jirrima Crescent extending eastward from the sites north-east corner. The site is otherwise
surrounded by neighbouring rural residential land.
An existing residence is situated in the north-eastern corner of the site, which is expected to be fully retained
within proposed Lot 2.
Most of the site is likely to have been previously cleared, with some remnant native vegetation present near
the site’s western boundary. Site vegetation across the central and eastern side of the site consists of low
grass cover with sporadically distributed eucalypt and melaleuca trees.
Existing ground elevation across the site ranges from RL 6 m to RL 10 m AHD. The site is relatively flat, with
some gentle ground slopes (< 5%) sloping inward toward a central creek line which exits the site at the
northern boundary.
Text Figure 1 below illustrates to subject site location and surroundings. Text Figures 2 and 3 over page
show the site general site conditions at the time of investigation.




                 Subject Site




Text Figure 1: Site location (courtesy Google Earth)



4 November 2020
Report No. 20333-001-Rev0                               1