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Issue Date: Nov 2013 MRWA Specification No 04-03.2 Page 24 of 34

MRWA Melbourne Retail Water Agencies

5.5 Drives and Tunnels

Drives and tunnels must be refilled above the embedment zone using the following materialsand methods:

  20 mm Class 4 crushed rock, or embedment concrete sand or 5 mm minus (blown in,not compacted),

  Grouting, either by gravity, or under pressure. (Gravity grouting shall only be used fortunnels where there is sufficient head.)

1.5m

CLASS 4 BACKFILLORDINARY BACKFILL

 

Figure 3: Backfill Around Shafts and Vertical Structures in Non-Trafficable Areas

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Issue Date: Nov 2013 MRWA Specification No 04-03.2 Page 25 of 34

MRWA Melbourne Retail Water Agencies

1.5m

ORDINARY BACKFILL

 

Figure 4: Backfill Type 2 Property Service Jump Ups in Non-Trafficable Areas 

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Issue Date: Nov 2013 MRWA Specification No 04-03.2 Page 26 of 34

MRWA Melbourne Retail Water Agencies

     1 .     5    m

 

Figure 5: Backfill Type 4 Property Service Jump Ups in Non-Trafficable Areas