Document ID: chunk:federal_register_of_legislation:F2013C00288:reg:1850:p70
Version: federal_register_of_legislation:F2013C00288
Segment Type: reg
Provision Reference: reg 1850 (pt 70/117)
Character Range: 543626–548037

pre-wet soils to control dust                                                                                                                               * contamination to about 30 cm depth depending on rotor blade size                                                 * limited application for deeper contamination (> 30 cm) or areas obscured by surface vegetation or debris
     * at least two passes with 90º direction change                                                                                                               * characterising the extent and level of contamination while reducing bonded ACM impact                            * evaluated areas cannot usually be considered representative of other locations
     * material should not be further damaged or buried by the process
     * rotor blade speed should be controlled to allow spotters to hand-pick revealed fragments
     * conducted across the entire area of suspected impact
     * % contamination calculated using an estimate of the average tilled depth per grid square
     * final visual inspection should not detect visible asbestos
   Mechanical screening                                                                                                                                            * minor bonded ACM                                                                                                 * not for fibre-generating materials or high levels of contamination
     * conducted across the entire area of suspected impact, large areas should be sub-divided for assessment                                                      * larger volumes of reasonably accessible and delineated soil contamination                                        * may not be suitable for compacted soils or soils with high clay content
     * large pieces may be removed by larger mesh sizes prior to final 7 mm effective mesh size                                                                    * characterising the extent and level of contamination while reducing bonded ACM  impact                           * evaluated areas cannot usually be considered representative of other locations
     * % contamination calculated using weight of bonded ACM found per given volume of soil screened from each strata/location                                                                                                                                                        * requires extensive management procedures to monitor and control dust and fibres
     * if percentage of small fragments is high, sampling of resulting screened stockpiles may be appropriate to ensure effectiveness of screening procedure
     * location of screened material should be carefully documented to permit follow-up sampling or segregation if required
     * final visual inspection of soil surface and segregated stockpiles should not detect visible asbestos
   Test pits and trenches                                                                                                                                          * all types of asbestos contamination but particularly bonded ACM, and FA if fibre disturbance is manageable       * shoring of exposed faces may be required to protect workers and the public from wall collapse or open excavation hazards and potential fibre release during excavation/sampling
     * sampling to 30 cm below likely limit of contamination or to likely maximum depth of soil disturbance                                                        * asbestos contamination extends below surface soils (about 30 cm)
     * suspect asbestos materials and construction debris should be targeted                                                                                       * if contamination is buried and of unknown location and depth

   Boreholes                                                                                                                                                       * all types of asbestos contamination                                                                              * smaller area/volume available for visual examination compared with test pits and trenches
     * sampling to 30 cm below likely limit of contamination or to likely maximum depth of soil disturbance                                                        * if contamination is buried and