App 5 - Wastewater Design

1.0 Introduction:

Biowater Designs Pty Ltd, in accordance with AS/NZS1547-2000 ( Domestic Wastewater Management ) and the
Queensland Plumbing & Wastewater code (QPW), was commissioned to undertake a Site & Soil Evaluation in the
Noosa Council at 328 Upper Pinbarren Creek Road, Pinbarren.

The results form the basis of our recommendations for on site wastewater disposal.

Our Site investigation and field work was performed on Friday 15th February 2019 after a period of wet weather.

The investigation was undertaken to determine the soil profile and Long Term Acceptance Rate (LTAR) of the site in
order to accommodate proposed amenities (shower, toilet and 2 handbasins) in a shed/workshop and future stables with
a washing machine and handbasin. No kitchen facilities or bedrooms to be installed.

NOTE: This evaluation was undertaken at the owner’s request after considerable discussion regarding environmental
issues of this site and preferred design of the Land Application Area.


2.0 Site Description:
2.1 Existing Buildings: Dwellings & Sheds. The existing dwellings do not form part of this assessment.


2.2 Site Factors:

The site is a large acreage allotment the area is 256269.38m2.

The proposed Land Application Area is slightly sloping (3%) to the South-East.

The proposed Land Application Area has very good exposure to sun and wind.

Erosion, mass movement or land slip was not observed on this site. Rock outcrops are not evident on this site.

Vegetation on this site consists of small to large trees and shrubs of various species and has 100% grass cover.

There are no bores on this site or adjoining properties within the required setbacks of the proposed Advanced Enviro-
Septic Bed.

There is a small creek at the front of the property, several dams and intermittent waterways across the site. Setback
requirements under ASNZS 1547:2000 for Advanced Secondary Effluent are obtainable.

Ground water was not encountered on this site during our investigation to a depth of 1500mm.

There is no evidence of fill in the proposed Land Application Area.

Rain water will transverse this site from adjoining properties during heavy rains.

Concentrated run-off from this property will transverse adjoining properties during heavy rains.

Soils were moist and there is no evidence of soil surface cracking. No evidence of compaction or seepage areas.
Salinity is not evident.


3.0 Soil Investigation:

3.1 Drainage Pattern: Linear Planar
3.2 Method:
Soil Testing for the site was conducted by Global Testing on 29th January 2019 to a depth of 1500mm. See borelogs attached.

The soils were visual one textually classified in accordance with AS/NZS 1547:2000. The soils were
predominately red/brown in colour. Strongly structured Sandy Clay.

Forms a plastic ball in which sand grains can be seen; felt or heard; forms a ribbon
50-75 mm long. Category 5 adopted.


                                                                                     C Copyright Lance Picton 2019 design & content.   2/10