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Environmental Report (onsite effluent disposal) · MCU13/0064
8th April 2013
Makepeace Island
Assessment of Existing
Wastewater
Our Ref: Infrastructure –
4225 Proposed Change of
Use
Makepeace Island,
Noosa North Shore
Client: Makepeace Island (Operations)
Pty Ltd
Future-Plus Environmental Sunshine Coast (SQ)
PO Box 1250 Buddina QLD
Future-Plus Environmental Gladstone (CQ)
PO Box 1290 South Gladstone QLD
p: 07 5450 2688 e: [email protected] PO Box 1250, Buddina Q 4575
f: 07 5450 2686 www.future-plus.com.au ABN 23 658 506 336
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Page 2
8th April 2013
Our Ref: 4225-130402-1.0
The Chef Executive Officer CC: General Manager
Sunshine Coast Regional Council Makepeace Island (Operations) Pty Ltd
Sunshine Coast Mail Centre PO Box 672
Locked Bag 72, Tewantin Qld 4565
QLD 4560
Attention: Assessment Manager Attention: Nick Jones
SITE INVESTIGATION AND ASSESEMENT OF EXISTING
WASTEWATER INFRASTRUCTURE
MAKEPEACE ISLAND, NOOSA NORTH SHORE
We refer to the above project and your request for the evaluation of the current
on-site sewerage treatment plant and effluent irrigation area at Makepeace Island,
Noosa North Shore.
An assessment of the existing wastewater infrastructure currently servicing the
accommodation facilities at Makepeace Island was undertaken by Future-Plus
Environmental on the 2nd April 2013. The assessment of the on-site effluent
disposal system was undertaken to determine its suitability to cater for the
proposed change in use from non-publicly available accommodation to ‘letting of
individual rooms of an existing detached house for short term visitor
accommodation’. The number of rooms, guests and facilities remains relatively
unchanged from the original assessment completed by Future-Plus Environmental
(FPE) in 2007.
This report summarises the findings of the site assessment, including an
assessment of the hydraulic loading and effluent irrigation rate associated with the
proposed change in use.
Existing Infrastructure & Sizing
The Makepeace Island accommodation facilities are currently serviced by a
Department of Housing and Public Work (DHPW) approved, Advance Secondary
Novaclear Aerated Waste Treatment System (AWTS) and an associated effluent
disposal area.
In accordance with the original Site and Soil Evaluation Report (ref no. 2771-02)
completed by FPE on the 20th June 2007, the AWTS is to have a peak design
capacity of not less than 2,475L/day (13 equivalent persons (EP)). Based on
information supplied by the existing service agent (H2Gold), the AWTS currently
p: 07 5450 2688 e: [email protected] PO Box 1250, Buddina Q 4575
f: 07 5450 2686 www.future-plus.com.au ABN 23 658 506 336
Page 3
has the peak design capacity of up to 2,700L/day (14 EP). This is considered to
be satisfactory. Refer Photo Plate 1 contained in Attachment 1 of this
correspondence showing the existing STP.
Treated effluent is currently irrigated via a subsurface irrigation system within
two (2) designated effluent disposal areas. The disposal areas were originally
designed for 495m2 however a total area of 540m2 of raised garden beds was
installed for conservative purposes. Refer Photo Plate 2 contained in Attachment
1 of this correspondence showing the existing land application area.
Wastewater Hydraulic Loading
In accordance with the proposed change in use, the accommodation facilities
located at Makepeace Island will have the capacity to cater for a total of twenty
two (22) guests, located in a series of free standing buildings. In addition to the
guest accommodation facilities, a total of two (2) staff members are
accommodated within the caretaker’s residence.
The hydraulic loading associated with the guest and staff accommodation
facilities can be most reliably calculated using Chapter 5 Table A of DEHP
(formerly DNR&M) Planning Guidelines for Water Supply and Sewerage, as
follows:
Table 1: Calculated Hydraulic Wastewater Flows from DEHP (formerly DNR&M)
Daily Sewage
Rooms per Total Daily Sewage Adopted Total
Item Source Quantity Flow per Room
Structure Flow (L/day) Flow (L/day)
(L/day)
1 Bungalow(s) 3 2 300 – 6001 900 – 1 800 1,350
2 Long House 1 4 225 – 4502 900 – 1 800 900
3 Boat Shed 1 1 225 – 4502 225 – 450 225
Caretaker’s
4 1 1 225 – 4502 225 – 450 225
Residence
Total (L/day) 2,700
Total Site equivalent persons (EP) @ 200L/EP 14
Note: 1Flow per person based on two (2) bedroom Apartment/Home Unit with reticulated water supply
2Flow per person based on one (1) bedroom Apartment/Home Unit with reticulated water supply
Based on the above references, a total hydraulic loading of 2,700 litres per day
(14EP) can be estimated for the guest and staff accommodation facilities at the
Makepeace Island facility.
p: 07 5450 2688 e: [email protected] PO Box 1250, Buddina Q 4575
f: 07 5450 2686 www.future-plus.com.au ABN 23 658 506 336
Page 4
On-Site Wastewater Land Application Area
Effluent irrigation currently occurs via subsurface dripper lines within the existing
raised garden beds, totalling 540m2.
Based on the estimated hydraulic loading of 2,700L/day, the required effluent
irrigation area can be determined using Design Irrigation Rate (DIR) calculation
as set out in Table M1 of AS1547:2012.
Table 2: Minimum Required Irrigation Area
Irrigation Area as Determined by Table M1
AS1547:2000 Soil Category
of AS 1547
Soil Category 2 – Sand 540m2
From Table M1 of AS1547:2012 assuming a hydraulic loading of 2,700 litres per
day and a Category 2 soil (DIR of 5mm/day), a minimum application area of
540m2 is required. It is noted that there is sufficient space available to
accommodate a 100% reserve area.
It appears that the estimated hydraulic loading from the proposed change will not
require a change in size of the existing effluent disposal system.
Suitability of Existing Wastewater Treatment System and Land Application Area
Based on the calculated peak hydraulic loading of 2,700L/day (14EP) and the
minimum required land application area of 540m2, no change to the existing
infrastructure in relation to sizing is considered necessary. The existing
Novaclear AWTS and subsurface land application area appear to be in sound
operating condition to accommodate the proposal.
Provided the on-site sewerage facility is maintained in accordance with the
recommendations provided in the Site and Soil Evaluation Report (ref no. 2771-
02) and operation and maintenance manual, there will be minimal risk of impact
to the site and surrounding areas. The system must be operated and maintained in
compliance with the manufacturer’s requirements to ensure this risk is
appropriately managed.
p: 07 5450 2688 e: [email protected] PO Box 1250, Buddina Q 4575
f: 07 5450 2686 www.future-plus.com.au ABN 23 658 506 336
Page 5
We trust that the details set out above are of assistance. Please address all enquires
to Michael Baynes of our office on 07 5450 2688.
Yours faithfully
FUTURE-PLUS ENVIRONMENTAL
Paul Wood
Director
07 54502688
p: 07 5450 2688 e: [email protected] PO Box 1250, Buddina Q 4575
f: 07 5450 2686 www.future-plus.com.au ABN 23 658 506 336
Page 6
Attachment 1
Site Photos from Inspection 2nd April 2013
p: 07 5450 2688 e: [email protected] PO Box 1250, Buddina Q 4575
f: 07 5450 2686 www.future-plus.com.au ABN 23 658 506 336
Page 7
Photo Plate 1: Existing Sewerage Treatment Plant
Photo Plate 2: Existing Land Application Area No.1
p: 07 5450 2688 e: [email protected] PO Box 1250, Buddina Q 4575
f: 07 5450 2686 www.future-plus.com.au ABN 23 658 506 336
Page 8
Photo Plate 3: Existing Land Application Area No.2 p: 07 5450 2688 e: [email protected] PO Box 1250, Buddina Q 4575 f: 07 5450 2686 www.future-plus.com.au ABN 23 658 506 336
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