Document ID: chunk:federal_register_of_legislation:F2013C00288:reg:1850:p72
Version: federal_register_of_legislation:F2013C00288
Segment Type: reg
Provision Reference: reg 1850 (pt 72/117)
Character Range: 550528–553319

should be excluded from calculations to avoid dilution effects.
For localised methods (test pits, trenches and boreholes) samples should be taken from each relevant stratum in one wall of test pits and trenches or each relevant stratum for boreholes at each sampling location, and additional samples from suspect spots.
Bonded ACM and FA samples from test pits, trenches and boreholes
    * sampling should be conducted to 30 cm below the likely limit of potential contamination or to the likely maximum depth of disturbance (large sites may be split into sub-areas for sampling purposes, the rationale should be included in the assessment report)
    * at least one minimum 10 L sample from each relevant stratum (or per 1 m depth for thick units) for test pits, trenches and core from boreholes and additional samples from any suspect spots
    * individual samples (minimum of 10 L) should be manually screened on-site through a 7 mm sieve and the material retained on the sieve examined for any bonded ACM and/or suspect material
    * for heavy soils (e.g. clay soils), the samples may need to be gently disaggregated by washing and spread out on a suitable contrasting colour material to determine the amount of bonded ACM present
    * if visible FA material is present or suspected, the soil should be wetted to minimise the release of fibres and the sample spread out for inspection on a contrasting colour material, to identify suspect material
    * identified bonded ACM and FA (and suspect materials assumed to contain asbestos) should be weighed for each sample and documented to assist with calculating asbestos soil concentration as described in Schedule B1
    * if suspect materials are found (which are suspected of containing asbestos), representative samples (e.g. 1 in 10 of similar materials, the number analysed should take into account the variation in appearance and form) should be forwarded for laboratory analysis in accordance with AS 4964-2004. Alternatively the suspect materials may be assumed to contain asbestos.

AF-related sampling
Quantification of bonded ACM may be used as a surrogate measure for AF in certain circumstances, refer to the discussion at the start of this Section.

If sampling for AF is necessary:
    * sampling should be conducted to 30 cm below the likely limit of potential contamination or to the likely maximum depth of disturbance (large sites may be split into sub-areas for sampling purposes, the rationale should be included in the assessment report)
    * at least one wetted 500 ml sample from each relevant stratum (or per 1 m depth for thick units) for test pits, trenches and core from boreholes and additional samples from suspect spots should be submitted for laboratory analysis. The rationale for this sample size is