Document ID: chunk:federal_register_of_legislation:F2013C00288:reg:5:p2
Version: federal_register_of_legislation:F2013C00288
Segment Type: reg
Provision Reference: reg 5 (pt 2/10)
Character Range: 150296–153288

residential use

Site Scenario
A former industrial site is proposed for redevelopment for high density residential land use.  The site was historically filled in some areas with material containing bonded ACM to approximately 3 m depth (possibly as a result of poor demolition practices).  More recently, the contaminated fill was covered by approximately 0.5 m of clean soil as an interim management measure. The proposed development will require that there is major site excavation to >3 m as well as alteration of the land form. Although broken, the bonded ACM fragments appear in reasonable condition and are not easily crumbled i.e. not fibrous asbestos. There is no evidence from the site history or direct observation during the initial site walkover that other fibrous asbestos materials (such as insulation or woven materials) are present on the site. Other non-asbestos soil contaminants may be present.

Response
In this redevelopment scenario, there are two potential options:
    * Option A - excavate all the affected fill (and validate the work undertaken including that no visible asbestos is present on the site surface) and either manage by containment on-site or off-site disposal at an appropriate waste facility
    * Option B - carry out a DSI to delineate the volume of contaminated soil requiring on-site containment or off-site disposal
The size of the site, the potential volume of affected fill and the practicality (including regulatory requirements) of containing asbestos-contaminated soil on-site, are likely to influence the decision taken.

The following steps outline Option B - the DSI approach:
   1           Preliminary site investigation – desktop study and detailed site inspection
       * collect information on the location, condition and amount of bonded ACM present on the site surface to inform the SAQP for the DSI.
   2           Preparation of the Sampling and Analysis Quality Plan (SAQP) - A conceptual site model (CSM) and data quality objectives (DQOs) should be developed which identify all the site-specific contaminants of concern including relevant forms of asbestos and the potential human health risks (refer Schedule B2).
       * the sampling program should account for the potentially non-homogenous distribution and condition of bonded ACM in soil, for example using judgemental sampling involving a detailed test pit and trenching program to identify the lateral and vertical distribution
       * photographic logging of test pits and trenches will assist documentation for site assessment
       * qualitative laboratory analysis may be required to confirm that representative pieces of suspect bonded ACM and other suspect material (if found during the site walkover or during test pitting and trenching) contain asbestos.
       * soil sampling for the detection of asbestos fibres released from fragments of bonded ACM is not required where the bonded ACM is in good/reasonable condition.
       * if fibrous asbestos (such