Response to oustanding issues Animal Husbandry MCU12/0184

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                                                                                 Callaghan & Toth

3.       WATER QUALITY MANAGEMENT PLAN

3.1      Proposed On-Site Stormwater Treatment Process

The developed site was divided into MUSIC model sub-catchments as shown on Plans 02 to
04. The proposed treatment train for the development site is illustrated on Plans 02 to 04
and 09 to 11 and listed below:


1. Bioretention    Swales will treat the stormwater runoff from the access roads, car parks,
     from Catchment F. The Swale is 0.6m wide at the base and will be vegetated with
     effective nutrient removal plants. The treated runoff will then be directed to vegetated
     areas within the       property which eventually drain to dams which use the collected water
     for irrigation of the Avocado trees. The bio-retention component of the swales will
     remove the nutrients,       heavy metals, and retard flow.

2. Grass     Swales will treat the stormwater runoff from grassed areas adjacent sheds,
     Catchments C, G, GA, H, T, U and W. The Swales will be 0.6m wide at the base and will
     not be vegetated with effective nutrient removal plants.


3. Bioretention     Basins will treat the stormwater runoff from bunded composting areas,
     access roads,      carparks and Catchment K and N. The Bioretention Basin’s sizes for the
     site are as follows:


     .   Catchment K and N Bioretention Basin will be 55m2 in area.
     .   The 70m long bunded composting area Bioretention Basin will be 20m2.
     .   The 120m+87m long bunded composting area Bioretention Basin will be 50m2.
     The treated runoff will then be directed to vegetated areas within the property. The bio-
     retention component of the basins will remove the nutrients, heavy metals, and retard
     flow.


4.   Grass Vegetated Buffers will treat the stormwater runoff from access roads and carparks
     from Catchments A, B, D, E, I, L, M, 0, P, Q, R, S, V, W1 and X. The vegetated Buffers
     will be 5m wide for the length of each catchment and flow from the catchments will be via
     sheet flow.


5. Rainwater      Tanks will be required to collect water from the new shed roofs. The tanks are
     to be above ground with an overflow pipe discharging to the adjacent swales which drain
     to on site dams used for irrigation. The tank capacity is to be adequate for the part
     supply of poultry water needs and to control humidity in the sheds.

6. Sediment      Basins wet coarse Sediment Basins will be required to pre-treat runoff from the
     bunded poultry litter composting areas:


     .   The sediment basin area required for the 70m long bunded composting area is 19m2
     .   The sediment basin area required for the 120+87m long bunded composting area is
         51.1 m2


     Calculations for sediment basins sizing are in Appendix 8.




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1209 Animal Husbandry   -

                         Top Forestry Rd. Ridgewood                            SWQMP_REV_3
September 2013