Our ref: 16TOO-0064/1701198 16 May 2017 Attn: Rebecca Curtis Department of Infrastructure, Local Government and Planning Fitzroy/Central Regional Office Level 2, 209 Bolsover Street PO Box 113 ROCKHAMPTON QLD 4700 Dear Rebecca,

RE: Information request (SDA-1216-036585) (403.2016.19) – Development Permit for a Material Change of Use: Intensive Animal Husbandry (10,000 SCU) feedlot and associated infrastructure

In response to the Department of Infrastructure Local Government and Planning (DILGP) information request dated 17 January 2017, and in accordance with Section 272 of the Sustainable Planning Act 2009, I would like to advise that all the information requested by DILGP has been prepared. The responses have been provided in red text below.

1. The Department has assessed the risk to surface waters to be moderate due to the site being located in the vicinity of a Matter of State Environmental Significance (MSES), specifically a wetland mapped as being of high ecological significance. Using the standard tabulated method for determining holding pond volumes as described in the National Guidelines for Beef Cattle in Australia 3rd Edition 2012 the proposed effluent holding pond is insufficiently sized for the Controlled Drainage Area (CDA) as the method described above requires a minimum holding pond volume of 138ML.

Please provide the Department with the following information:

• Provide a copy of the Medli output file text and any other assumptions used to size the effluent holding pond; and When sizing the sedimentation system and holding pond for the proposed feedlot the DAF Feedlot Assessment Spreadsheet was used. Climate and stock numbers are the most crucial factors determining the size of the sedimentation system and holding ponds. For the proposed development, 10,000 SCU was used for cattle number and the Duaringa climatic locality was chosen from the list of included climate data. Duaringa was used as it is close to the proposed feedlot and in the same climatic zone as the proposed feedlot as it is on the western side of the Great Dividing Range. Using the aforementioned parameters, a sedimentation system volume of 9 ML and a holding pond volume of 60 ML was calculated, see Attachment 1.

• Provide an amended typical sedimentation basin and effluent holding pond design (Fig.17) indicating a minimum freeboard of 0.9m as required in the National

Guidelines for Beef Cattle in Australia 3rd Edition 2012; and Free board on both the sedimentation system and holding pond has been amended to 0.9 m, see Attachment 2.

• Provide an amended proposed feedlot design plan (Fig.13) at an appropriate scale indicating the volumes and dimensions of the sedimentation basin and effluent holding pond; and Amended plan including volumes and dimensions of the sedimentation basin and effluent holding bond have been included in Attachment 3.

• Provide specific contingency measures that address the management of the feedlot CDA during prolonged wet weather to minimise the risk of contaminated stormwaters impacting on surface waters and associated wetlands. Management of effluent that is released via the effluent holding pond spillway during a 1 in 10 year storm event should also be addressed in relation to the potential for feedlot contaminants to be released to mapped wetlands. A series of diversion banks will be constructed downslope of the effluent holding pond by-wash. Figure 19 (Attachment 4) shows the approximate location of the diversion banks. As a survey has not been undertaken, the final location of the diversion banks will be confirmed pre-construction. It is anticipated that the diversion banks will be constructed at a 5-degree angle to the natural contours of the land with each bank being approximately 300m long. This will ensure they are free draining, whilst reducing the velocity of potentially contaminated surface water. This will allow further nutrient and sediment to settle out prior to entering the drainage line and subsequently the McKenzie River. The diversion banks will also ensure that effluent from a spill event will not impact on the HES wetland. Reducing the velocity of the surface water will also reduce the risk of erosion.

Regards

Riki Lewis Agricultural Scientist

Willunga Grazing Company

16TOO-0064/1701198 16 May 2017 3

Attachment 1 – Feedlot Assessment Spreadsheet Sections

Draft - for consultation purposes only 1 - General

Landholders' name(s) Willunga Grazing

Company

Effluent management system 1

Cattle feedlot name Lake Mary

Spreadsheet user name

PIC (Property Identification Code)

Assessment identification

Feedlot locality

Assessment date

Feedlot Shire Duaringa

Possible climatic locality Duaringa Staged developmentMost representative climatic locality Duaringa

Is it intended to develop the proposed feedlot in stages? No

Average annual rainfall (mm) 715

Stage 1 Stage 2 Stage 3

Maximum feedlot cattle capacity (SCU) 10,000 Cattle capacity per stage 10,000

Feedlot class 1 Pen numbers (as per plan) 50

Anticipated completion date

General

Sedimentation system, holding pond & effluent

irrigation

15 April 2015

FSA Consulting

Department of Primary Industries and Fisheries Page 1 of 18446 DPI&F Spreadsheet

12/05/2017

Draft - for consultation purposes only 2 - Pens

No of controlled drainage areas Current setting: 1 CDA's

Controlled drainage area 1 2 3 Total Units

Stocking density m2/SCU

Comment OK

Number of production pens 50 50 pens

Proposed cattle capacity 10,000 10,000 SCU

Comment OK

Pen area 15.00 15.00 ha

Comment OK

Hard catchment area 10.43 10.43 ha

Comment OK

Soft catchment area 5.01 5.01 ha

Pen down-slope 4.0% %

Comment OK

Pen cross-slope 2.5% %

Comment OK

Drain slope 1.0% %

15.0

Pens

Department of Primary Industries and Fisheries Page 1 of 18446 DPI&F Spreadsheet

12/05/2017

Draft - for consultation purposes only 4 - Sed system

Controlled drainage area 1 2 3 Total Units

Proposed sedimentation system type Basin

Length to width ratio (L/W ) 2.5 0 0

Scaling factor (l ) 2.5 0.0 0.0

Design flow velocity (v ) 0.005 0.005 0.005 m/s

Pen overland flow length 50

Pen overland flow time 7.4 0.0 0.0 minutes

Drain length 700 m

Drain flow time 16.7 0.0 0.0 minutes

Time of concentration (tc) 24.04 0.00 0.00 minutes

Average rainfall intensity for 20 year ARI

design storm (20yr

I tc)

115.97 0.00 0.00 mm/hr

Peak inflow rate for 20 year ARI design storm

(Q p )

7.20 0.00 0.00 m3/s

Required sedimentation system volume (V ) 8,999 0 0 8,999 m3

Proposed sedimentation system volume 9,000 9,000 m3

Comment OK OK OK OK

Minimum surface area 0.90 0.00 0.00 0.90 ha

Sedimentation system

Department of Primary Industries and Fisheries Page 1 of 18446 DPI&F Spreadsheet

12/05/2017

Draft - for consultation purposes only 5 - Holding pond

Controlled drainage area 1 2 3 Total Units

Standard tabulated method for determining holding pond volume (Skerman, 2000)

Effluent holding pond storage capacity (V) 59.44 0.00 0.00 59.44 ML

Major storm event holding pond volume calculation (National Guidelines, ARMCANZ, 1997)

1 in 20 yr, 24 hr storm intensity (20 yr

I 24 hr ) 7.39 7.39 7.39 mm/hr

Effluent holding pond storage capacity (V) 39.64 0.00 0.00 39.64 ML

Required effluent holding pond storage capacity (V) 59.44 0.00 0.00 59.44 ML

Proposed effluent holding pond storage capacity (V) 60.00 60.00 ML

Comment OK OK OK OK

Required Pond Dimensions (based on fully excavated, rectangular based storage, constructed on flat, horizontal site)

Depth - base to bywash level, (D) 4.00 m

Batter - lengthwise, Zl (1 vertical : z horizontal) 3.00

Batter - breadthwise, Zb (1 vertical : z horizontal) 3.00

Freeboard - bywash to crest, (F) 0.90 m

Length - at embankment crest, (Lc) 150.00 m

Breadth - at embankment crest, (Bc) 129.10 0.00 0.00 m

Length - At bywash level, (Lfsl) 144.60 0.00 0.00 m

Breadth - at bywash level, (Bfsl) 123.70 0.00 0.00 m

Length - at base, (Lb) 120.60 0.00 0.00 m

Breadth - at base, (Bb) 99.70 0.00 0.00 m

Surface Area at Embankment Crest 1.937 0.000 0.000 1.937 ha

Lc x Bc

Lfsl x Bfsl

F Bywash level (full supply level - fsl )

D

Zl

Zb

Lb x Bb

Effluent holding pond(s)

1

Holding pond storage capacity, V

Department of Primary Industries and Fisheries Page 1 of 18446 DPI&F Spreadsheet

12/05/2017

Willunga Grazing Company

16TOO-0064/1701198 16 May 2017 4

Attachment 2 – Typical Sedimentation Basin Design

FSA ConsultingTOOWOOMBA OFFICEPO BOX 2175TOOWOOMBA QLD 4350TELEPHONE (07) 4632 8230FACSIMILE (07) 4632 8057

www.fsaconsulting.net

Willunga Grazing Company

16TOO-0064/1701198 16 May 2017 5

Attachment 3 – Feedlot Design Plan

FSA ConsultingTOOWOOMBA OFFICEPO BOX 2175TOOWOOMBA QLD 4350TELEPHONE (07) 4632 8230FACSIMILE (07) 4632 8057

www.fsaconsulting.net

©

Willunga Grazing Company

16TOO-0064/1701198 16 May 2017 6

Attachment 4 – Diversion Banks

FSA ConsultingTOOWOOMBA OFFICEPO BOX 2175TOOWOOMBA QLD 4350TELEPHONE (07) 4632 8230FACSIMILE (07) 4632 8057

www.fsaconsulting.net

Map disclaimer:

Comprehensive mapping for wetlands of high ecological

significance (HES) and general ecological significance

(GES) across Queensland. The Areas of Ecological

Significance method has been applied to identify HES

and GES wetlands outside Great Barrier Reef

catchments.

The wetlands are selected from Version 2 of Queensland

Wetland Data - Wetland System, State Marine Parks,

Queensland Wetland Data - Springs, Queensland

Wetland Data - Riverine Drainage Lines.

Data Quality: Polygons visually checked and by

topological consistency checks. Formal assessments

show the attributes to be correct.

State of Queensland (Department of Environment and

Heritage Protection) 2015.

©