Attachment 5 - Site Assessment and Soil Test for effluent disposal

LOT 21 (No.16) PINES ROAD, COOROY                        EBIS REFERENCE NO: 210417-ED


3.6      Water Table

No water table was encountered in the soil profile.


4.0      CONCLUSIONS
4.1      Soil Classification

The soils were visually and texturally classified. The soils are predominately weakly
structured to massive structured clay loams, overlying moderately structured medium
to heavy clays.

4.2      Soil Properties

Based on the above information and Table M1 from AS/NZS 1547:2012
(Recommended design irrigation rate for irrigation systems), we consider the soil to
have the following properties:
Average Ksat                        0.06-0.12m/day
Design Irrigation Rate              3mm/day

4.3      Effluent Quantity

Based on a four (4) bedroom residence the total effluent flow would be
approximately 720L/day calculated from the following:
Number of persons                           6
Water supply                                Tank
Water fixtures                              Standard
Typical Wastewater Flow                     120L/person/day
(From Appendix H Table H1 of AS/NZS 1547:2012 using standard water fixtures)

5.0      RECOMMENDATIONS
5.1      Treatment Method

A household treatment plant providing advanced secondary treated effluent is
proposed for this site. This proposed system is designed for a fifteen year life. The
treatment plant should be registered as an approved system with the Department of
Natural Resources.

5.2      Disposal System

A covered surface pressure drip irrigation system on an area of 240m2 should be
installed as shown on the attached drawing A3-210417-ED1. Adequate area exists
onsite for duplication or extension of the irrigation system. Warning signs are to be
placed in the vicinity of the irrigated areas.

5.3      Disposal Area Modifications

We recommend that the disposal area be modified as follows:
      1. Removal of vegetation from the site
      2. Prepare bed for mulched garden bed.

6.0      MAINTENANCE NOTES

The treatment plant is to be maintained in accordance with manufacturer’s specification.
Some components of the system may need replacement or re-establishment within a fifteen
year period including:


PROPOSED NEW RESIDENCE                   PAGE 2 OF 4                    7 February 2022