Appendix C - Ecological Assesment

                                                                                       PROJECT: J000988




Friday, 26 November 2021

Tony Rossiter
Via Email: [email protected]

Dear Tony,
RE: Proposed Dam impact to Native Vegetation – 8 Robin Place Lake MacDonald QLD

North Coast Environmental Services undertook a site investigation on Monday 22nd November 2021
to assess the ecological values present within and adjoining the proposed dam footprint at 8 Robin
Place Lake MacDonald (Lot 13 SP315578). Lot 13 was recently created as part of a rural residential
subdivision (Council Ref: OPW20/0051) and vegetation at the rear of the lot was subsequently
registered under conservation covenant. It is understood you are the new owner of Lot 13 and you
wish to construct a dam in the north of the lot within approximately 20m of the covenant edge. The
plan of the dam presented to us for assessment purposes is presented as Attachment 1.

No material impact is expected to the covenant vegetation given its separation of 20m from the
nominated position of the dam. It is noted that you informed us that the dam linework in Attachment
1 represents the centre of the top of bank of the dam. Further, the geotechnical assessment by
Tectonic has recommended the batters of the dam be constructed at 1:3 grade on the downslope
side of the dam and 1:2 on the high side. We have therefore assessed that the required downslope
batter of the dam would extend approximately 6m from the delineated top of bank in Attachment 1
on the assumption that the top of bank RL would be approximately 2m above ground RL 9as per
your advice on site). Consequently, approximately 14m separation is anticipated post dam
construction between the toe of the dam batter and the adjacent covenant boundary.

Whilst the covenant vegetation will not be impacted, a small copse of native trees are present
between the nominated dam location and the covenant boundary and are captured under the Noosa
Plan as being within a native vegetation area. These trees were not captured in the covenant under
the subdivision due to their non-remnant status and given they were scattered amongst a slash pine
infestation which has since been cleared to satisfy the DA conditions. Plate 1 identifies the conditions
within and abutting the proposed dam and the extent of trees anticipated to be directly impacted.
The trees comprise regrowth trees over a grassy understorey dominated by Imperata cylindrica
along with some regrowth saplings of mixed native species.




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