Attachment 1 - Op Works Negotiated Decision Notice · OPW11/0335

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[OCR of page images]
OPW 11/0335

 

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survey markers in each such basin to indicate the level that water within the basin
must be lowered to, in order to meet the storage capacity specified in the above
requirement.
Ensure sediment basins are dewatered as soon as practicable after each rainfall
event and within 2 days of rainfall ceasing.
Ensure that during dewatering, the concentration of total suspended solids (“TSS”)
discharged does not exceed 50mg/L and that pH is within the range of 6.5-8.5. The
concentration of TSS released by dewatering may only exceed 50mg/L where it
can be demonstrated and supported through appropriate documentation that:
|. further significant rainfall is forecast to occur before the TSS
concentration is likely to be reduced to 50mg/L ; and
Il. releasing a higher concentration of total suspended solids will result
in a better environmental outcome by providing storage for the
capture and treatment of runoff from the imminent rainfall and
runoff; and
Ill. flocculent has been applied and the concentration of TSS in the
captured water has already significantly decreased.
Ensure sediment basins and associated structures such as inlets, outlets and
spillways are structurally sound for the 1 in 10 year ARI rainfall event, under normal
circumstances and for the 1 in 100 year ARI rainfall event, if failure of the basin
poses a threat to downstream dwellings or public safety.
Ensure accumulated sediment from basins and other controls is removed and
disposed of appropriately without causing water contamination.
Ensure sediment does not leave the site on the tyres of vehicles.

Limit soil exposure on the site to a distance of no more than 2m beyond the extent of
earthworks shown on the approved Earthworks Plans except where the exposed soil is
effectively stabilised without delay and prior to rainfall occurring.

LANDSCAPING

42. Prior to requesting a prestart meeting:

a.

tree protection fencing must be installed under the supervision of the Project
Arborist in accordance with the approved Arborist Report. (Refer to Retention of
Existing Trees Conditions)

43.A joint prestart meeting must be organised with Council’s delegate* (giving at least 5
business days notice). The prestart meeting must be attended by the:

(a)

Applicant,

Engineering Consultant,
Project Arborist,

Landscape Consultant,
Rehabilitation Contractor,
and all other relevant parties

*(Refer to Advisory Note)
44. A qualified (person) Project Arborist* must be engaged for the duration of the works to:

a.

b.

c.

ensure works are carried out in accordance with the approved Arborist Report,
prepared by Leaf and Limb, for Matrix Projects Pty Ltd dated 11 June 2010
oversee installation of all tree protection fencing prior to commencement of any
works onsite (including any clearing).

supervise tree protection within the development site and frontages, prior to, during
and following construction in accordance with AS4970 Protection of trees on
development sites.

oversee approved tree removal in proximity to retained trees.

undertake a risk assessment of all trees within ‘striking distance’ of the
development works and site and carry out hazard removal and amenity pruning in
accordance with AS4373: Pruning of amenity trees.

FM1509s/2-13/04/2011 Page 9 of 24