TENDER 0518 – HIGH LEVEL OVERFLOW ACROSS POW SPORTS GROUND
Question
1. Is the disposal of the excess contaminated material to be
excavated from the high flow stormwater site allowed to be
dumped at the Jackson Street Tip and if so would we expect
this to be free otherwise how much would we expected to
be charged?
2. To what standard is the reinstatement of the sports ground
required to be completed to and the extent because
generally the whole area will be excavated or damaged.
Reinstatement is mostly in regard to the ground levels,
topsoil depths and can we assume that we can reuse the
original topsoil there now?
3. Also is it required that the high level stormwater duct be
staged in such a way that it would allow access to at least
one of the two sports grounds for sporting activities during
the construction period or can we assume full access to the
whole area at all times?
4. Now more importantly we feel that the time schedule to
these projects needs adhering to. Firstly the tender period
doesn’t allow a sufficient time, with effectively only about 2
weeks for the tenders to be compiled together. With some
project areas requiring high detail, information and
collaboration between organisations the tenders can only be
expected to of a reasonable level.
Page 1
Clarification
Council advise excess materials excavated from the high level
overflow will be accepted at the Jackson Street tip at no cost to
the success for tenderer.
Council’s expectation with regards to reinstatement shall be
reinstated to the same condition as a minimum prior to
construction.
Only if there is no additional cost to Council for this tender.
Assume full access and provide extra over for staged
construction if required.
Extension of time granted. Please see notice to tenderers no. 2
issued on 11/1/12.
Question
5. With many design elements needing time and cooperation,
an extension to the due tender date would enable us to
produce better detail and quality, thus the projects pricing
estimations overall will be of a higher accuracy. We are
requesting an extension to the due tender date of one week
which will also subsequently push back the projects time line
by the same amount. If the tender date isn’t extended then
most likely various parts will not be fully designed by the due
date leaving unknown aspects to the project and attributed
vague pricings. The construction period is also worrying
with 14 weeks specified leaving a tight schedule, we see that
6 weeks of this period would easily be taken up by
investigations, design (there will be some, tender date
extension or not), documentation and compiling and waiting
for approvals. Leaving 8 weeks to construct and finish the
job; an insufficient amount of time for these projects.
Allowance for the previously mentioned items into the
construction period should be considered, we see this
needing an extension of 8-10 weeks to accommodate
appropriately for both projects on offer at this present time.
6. What is the invert level of the existing 1800dia pipes?
7. From the long section it seems the invert level of the
proposed overflow culvert is 1.50m, is this correct?
8. If the new overflow culvert is set higher than the existing
1800dia pipes, wont Gepp Road still be inundated in the
event the 1800’s capacity is exceeded?
Page 2
Clarification
Council notify tenderers that an extension of time for
construction has been granted from 14 weeks to 20 weeks.
Approx. 1L 0.5m AHD. Please see pickup drawing within the
tender documents Gepp Parade 29/4/96 sheet 1.
This is correct
The invert of the new culvert is set slightly above the centreline
of the existing DN1800 to accommodate excess flow prior to the
DN1800 pipes capacity being exceeded.
9. A request for an extension to the current closing date of the
tender. Our preferred tender closing date being Wednesday
15th February 2012. We request this extension due to the
timing of the tender period coinciding with the
Christmas/New Year period in which a number of key
potential suppliers and subcontractors are unavailable to
provide pricing or design alternatives. An extension of time
would also facilitate the opportunity to explore design
options and optimisations to ensure that we can be in a
position to offer a quality design combined with a
competitive price structure.
10. Could you please confirm that GCC will accept at no charge
to the Contractor all surplus and/or contaminated fill
material at the Glenorchy Waste Centre. The Contractor
being essentially responsible for including in our tender price
the site handling, loading and cartage of such material to the
GCC Waste Centre for disposal.
11. I have been having a look at the provided documentation
and there is very little detail on what happens at SF001/04
which is the large pit on the Brooker Highway. There are
some indicative line drawings from Council’s GIS showing
the alignment of the stormwater pipes but these do not
show pipe sizes or invert levels and the only other detail
plan is a copy of the DPW plan of the twin 1800 pipes under
the highway which is in imperial units to presumably an
imperial datum. Can you provide me with some details of
the pipe configuration at the Brooker Highway to the same
datum please?
Page 3
Notified of extension of time.
Been answered previously.
Invert level of existing DN1800 diameter pipes is approx 0.5m
AHD. Other dimensions/levels should be determined from the
provided drawings
Question
12. What I have done here is prepare a DRAIN model of the line
to see what variations in overflow culvert are possible whilst
still meeting the maximum water level limits for the 1 year
and 20 year flows.
13. Table 3, section 2.3.2 of part D – Specification, specifies the
design flow rate through the culvert as 8,880 l/s (1 year ARI)
and 22,500 l/s (20 year ARI). Can you please confirm if these
flow rates are for the new culvert only, or for the combined
new culvert/existing dual pipe system?
14. Are details of the existing dual DN1800 pipe system and
outlet structure available please? Design/construction
drawings including RL’s would be of assistance.
Page 4
Clarification
No answer required.
New culvert only
Sorry no other additional information or drawings available,
other than what is in tender documents and explained above.