21556 Response to Information Request OPW220104

7. Information Required

Update the ESC plan and the sizing of the sediment basin so that the basin size is based
on a catchment area which includes the 2 existing properties which will also drain to the
internal road.

Response


The type B HES sediment basin has been increased in size to include the catchment from
the 2 existing properties fronting Pavilion St. Details are shown on drawing 21556-C100
Rev C. It is intended that the sediment basin be retained at the end of the works, and
modified as required, to form a farm dam on lot 10 (balance parcel). This has been noted
on the drawings.


Use of alternative to Reinforced Concrete Pipes

Our drawings specify the use of class 2 reinforced concrete pipes (RCP’s) as per Council
design standards, however given the current lead time for supply of RCP’s is currently in
the order of 32 weeks we seek Council’s approval to substitute the RCP’s with either
StromPRO (by Vinidex) or Enviropipes. These pipes are made from corrugated
polypropylene and HDPE respectively and have been used on many subdivisions in both
Gympie and Sunshine Coast regions over the past 12-18 months due to supply issues with
RCP’s. Links to the suppliers’ websites are provide below for your information. Your
support for the use of either of these two products would be appreciated. We understand
that similar pipes are being installed on Council’s Noosa Parade upgrade project currently
under construction.

https://www.vinidex.com.au/technical-resources/pro-and-flo-systems/

https://www.enviropipes.com.au/~enviropipes/index.php/storm-water-pipes/overview


We trust the above is satisfactory. Should you have any queries regarding this matter,
please contact the undersigned.

Yours faithfully,




Doug Reynolds, Director
07 5449 9600 | [email protected]
TOD consulting engineers