Document ID: chunk:federal_register_of_legislation:F2013C00288:reg:1850:p90
Version: federal_register_of_legislation:F2013C00288
Segment Type: reg
Provision Reference: reg 1850 (pt 90/117)
Character Range: 608918–611972

or concrete, or under cover where available, should be considered. Designation of an area within which all run-off and infiltration is to be controlled in accordance with strict performance objectives (for example, zero uncontrolled run-off) should also be considered. Disposal of any run-off should be carried out in accordance with relevant state or territory legislation.

Following rainfall it may be necessary to retrieve any sediment which has been carried in run-off or drainage water and manage this material appropriately. Respraying contaminated water onto stockpiles of contaminated soil as a means of effectively managing the water is also a possibility depending on jurisdictional guidelines and the nature of the contamination.

Treatment and disposal of collected contaminated run-off water should be appropriate to the contamination expected. If water treatment facilities are not immediately available, following consultation with local waste water authorities, diversion to sewer should be considered. Removal to landfill (not permitted in certain states) or treatment facility by means of road tanker is an expensive final option.

    15.2.4      Contamination carry-over to public roads and highways
Potential carry-over of contamination to public roads and highways is an issue where excavation plant is operating on a site. Care must be taken to ensure that potentially contaminated material is not transported off site. Vehicle washing systems with facilities for handling the wash water and the installation of 'rumble strips' to help dislodge dust and mud, should be considered for installation at exits from sites where potential carry-over is perceived to be a problem. Procedures should be set in place for the handling and disposal of potentially contaminated water arising from wheel-wash operations.

    15.2.5      Collection and disposal of contaminated water
Sample pits should be backfilled soon after sampling and sampling should not take place during rain. Contaminated water may be encountered where sample pits have been left open, and in boreholes. Care should be taken in disposing of contaminated flush water from borehole purging to ensure that contamination is not spread on the site. Gross contamination from borehole purging should be collected in drums or other suitable container for approved off-site disposal.

After excavation test pits may fill with rain or groundwater. Care should be taken to ensure that backfilling of the test pit does not rapidly displace this water, causing it to flow over the site. If necessary, the test pit should be part-backfilled and then bailed out to a suitable storage to enable full backfilling with spoil. Contaminated water should be disposed as appropriate.

All containers remaining temporarily on-site, and containing potentially contaminated materials, should be labelled with appropriate hazard warnings and waste producer contact details.

    15.2.6      Collection and disposal of excavation spoil
It is normal practice to return excavation spoil from test