2 Asset Information - Surf Coast Shire

SECTION
2 Asset Information 2
2.1 Introduction
The SCS database is a register listing information on the Council’s stormwater assets. The
information contained within the database as supplied by SCS is:
‣ Asset ID
‣ Plan No.
‣ Year Built
‣ Datum
‣ Datum Unit
‣ Diameter
‣ Pipe Material
‣ Joint Type
‣ Length
‣ Upstream Invert Level
‣ Downstream Invert Level
‣ Upstream Surface Level
‣ Pit Length
‣ Pit With
‣ Pit Depth
‣ Pit Type
‣ Town Char
‣ Catchment
2.2 Updating Database
SMEC updated the asset database for the Lorne stormwater system based on information supplied
from detailed field survey. The updated database includes all pits and pipes surveyed as part of
this study, as well as four gross pollutant traps (GPTs) located in Lorne. In addition to updating the
database, the existing information has been supplemented with a condition assessment for each
asset, and a replacement cost for each asset. The approximate age of each asset has also been
included, based on surface visual inspection.
The condition assessment resulted in each asset being assigned a rating for the expected
remaining service life of the asset. These ratings were dependent on the material of the asset.
Table 2.1 shows the ratings and the corresponding life expectancies used.
JOB REF 34440.100 Page 1

Table 2.1 Asset Rating Criteria
Rating
Number of Years Remaining
Concrete PVC
1 >100 >50
2

Table 2.2 Costs Used in Asset Valuation
Items Units Cost $/unit
Trench Excavation (exceeding 300mm)
Depth not exceeding 1000mm m 3 45
Depth 1000/2000mm m 3 94
Depth 2000/3000mm m 3 147
Depth 3000/4000mm m 3 198
Backfilling
Backfilling not exceeding 1000mm m 3 37
Depth 1000/2000mm m 3 74
Depth 2000/3000mm m 3 112
Stormwater Pipes - Concrete
225mm m 42
300mm m 76
375mm m 81
450mm m 116
525mm m 154
600mm m 181
675mm m 262
750mm m 268
900mm m 364
1050mm m 476
1200mm m 597
Stormwater Pipes - PVC
90mm m 14
150mm m 29
225mm m 63
300mm m 110
Box Culverts
450x225 m 102
450x300 m 115
600x450 m 187
750x600 m 221
900x300 m 211
900x450 m 242
900x750 m 286
1200x900 m 419
Box Culvert Lids
450mm m 81
600mm m 117
750mm m 137
900mm m 168
1200mm m 229
Pits - Insitu Concrete (900x900)
900x900x900 Units 1,643
900x900x1200 Units 2,464
900x900x1800 Units 3,286
Pit Covers
600x600 Units 32
900x900 Units 83
JOB REF 34440.100 Page 3

The costs shown in Table 2.2 were based on values taken from Rawlinsons Australian
Construction Handbook (2002) and where necessary they also draw on the experience of SMEC
on similar type projects.
The prices shown in Table 2.2 were based on the following assumptions:
• Concrete pipes are FRC Class 2 to AS4139-1993.
• PVC pipes are solvert welded joints to AS1254 – 1991.
• Costs have been escalated based on CPI and are represented as per June 2003. The CPI
index for June 2004 for the period June 2003 to June 2004 is 3.1%.
The updated asset database also includes the four existing gross pollutant traps (GPTs) in the
Lorne stormwater system. The asset value of the four GPTs has been supplied by SCS.
The total value of the assets listed in the database includes all pits, pipes and GPTs. The listed
value of an asset is the cost of replacement of the asset with a new asset of the same
specifications. The total stormwater assets in Lorne have been valued at $5,288,060. The asset
database is shown in Appendix A.
2.3 Asset Condition
A number of pipes along Mountjoy Pde and Bay St have been inspected using Close Circuit
Television (CCTV). SCS has been supplied with the video of these inspections and notes on the
condition of the assets inspected. SMEC has identified a prioritised list of pipes to be surveyed by
CCTV. Priorities range from 1 – indicating that the pipe should be inspected as a high priority – to
3 – indicating that inspection of the pipe is of low priority. Appendix B shows the full pipe network
with pipes colour-coded to indicate the level of priority for CCTV inspection. Pipes that have
already been inspected are coloured green. Pipes with priority 1 have been coloured red, pipes
with priority 2 have been coloured orange and pipes with priority 3 have been coloured yellow. The
remainder of the pipe network is shown in blue. The full listing of pipes inspected and priorities of
remaining pipes is also given in Appendix B.
Barry Bros Specialised Services have provided a quotation to undertake CCTV inspection of
priority 1 pipes. SMEC is awaiting approval from SCS to proceed with this work. Asset condition
assessments provided in this report may be influenced by the CCTV inspection results.
JOB REF 34440.100 Page 4