27 February 2007 - Ordinary Meeting of Council (pdf. 14MB)

Ordinary Meeting of Council - 27 February 2007 2 / 56
20 to 22 Tryon Road, Lindfield
Item 2
DA0826/06
22 January 2007
The following certification sheets must be accurately completed and attached to the
certification:
• Rainwater retention certification sheet contained at appendix 13 of Water Management
DCP 47
• On-site detention certification sheet contained at appendix 4 of Water Management
DCP 47.
120. Prior to issue of the Occupation Certificate a registered surveyor must provide a Works-as-
Executed (WAE) survey of the completed stormwater drainage and management systems. The
WAE plan(s) must be submitted to the Principal Certifying Authority for approval prior to
issue of the Occupation Certificate. The WAE survey must indicate:
• As built (reduced) surface and invert levels for all drainage pits.
• Gradients of drainage lines, materials and dimensions.
• As built (reduced) level(s) at the approved point of discharge to the public drainage
system.
• As built location and internal dimensions of all detention and retention structures on the
property (in plan view) and horizontal distances to nearest adjacent boundaries and
structures on site.
• The achieved storage volumes of the installed retention and detention storages and
derivative calculations.
• As built locations of all access pits and grates in the detention and retention system(s),
including dimensions.
• The size of the orifice or control fitted to any on-site detention system.
• Dimensions of the discharge control pit and access grates.
• The maximum depth of storage possible over the outlet control.
• Top water levels of storage areas and indicative RL’s through the overland flow path in
the event of blockage of the on-site detention system.
The WAE plan(s) must show the as-built details above in comparison to those shown on the
drainage plans approved with the Construction Certificate prior to commencement orf works.
All relevant levels and details indicated must be marked in red on a copy of the Principal
Certifying Authority stamped construction certificate stormwater plans.
121. Prior to issue of the Occupation Certificate a maintenance regime shall be prepared for the
basement stormwater pump-out system and submitted to Principal Certifying Authority. The
regime shall specify that the system is to be regularly inspected and checked by qualified
practitioners.
122. Prior to issue of the Occupation Certificate a suitably qualified consulting geotechnical
engineer is to provide certification to the Principal Certifying Authority that excavation and
construction of the basement level, including temporary and permanent shoring and retention
measures, have been carried out :
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