Document ID: chunk:federal_register_of_legislation:F2013C00288:reg:1850:p1
Version: federal_register_of_legislation:F2013C00288
Segment Type: reg
Provision Reference: reg 1850 (pt 1/117)
Character Range: 341336–350638

1850                                                                                                                                                                                                                               1900                                                                        10                                                                                            20                     30   40                1950                   60  70  80  90

                                                                                                                                                                                                                                                                                                                Tram batteries                                                                                                     '57  '67 - '72
                                                                                                                                                                                                                                                                                                                Paint shop
                                                                                                                                                                                                                                                                                                                Armature shop
                                                                                                                                                                                                                                                                                                                Machine shop
                                                                                                                                                                                                                                                                                                                Smithy
                                      Air photo                                      Photos

                                        1:500 site plans

                                                                                                                                                                                                                                                                                                                                                                                                                                                           Fuel storage:
                                                                                                                                                                                                                                                                                                                                                                                                                                                           Petrol   Diesel?
                                                                                                                                                                                                                                                                                                                                                                                                                                                           6 surface tanks 1970s
                                                                                                                                                                                                                                   ?                            As & herbicide ?             

                                                                                                                                                                                                                    ?
                                                                                                                                                                                                                    North part of
                                                                                                                                                                                                                    site sealed
                                                                                                                                                                                                                                                                                                                                                                                                             Tram barns demolished      wastes dumped in
                                                                                                                                                                                                                                                                                                                                                                                                                                         service pits?

                                                                                                                                                                                                                                                                                                              
                                                                                                                                                                                                                                                                   Southern                                                                                                                                ? …… 
                                                                                                                                                                                                                                   part of site unsealed
                                                                                                                                                                                                                                                                                                               Stated adequate liquid waste and lubricant disposal from sludge pits, sumps and service pits

Adapted from van Alphen (1993)

3.4               Environmental setting
An understanding of the environmental setting of the site is necessary for developing the CSM (refer section 4).

In general, the search radius should take into account the distance that contaminants could migrate to or from the site. A search radius of 500 m from the boundary of the site is suggested as a general guide for identification of potential ecological receptors such as surface water bodies, wetlands and areas of ecological significance.

If the site is located in low-lying land, consideration should also be given to whether the site is likely to be located in/affected by acid sulfate soils. Where there is the potential for acid sulfate soils to be present, this should be taken into account when preparing the sampling and analysis quality plan as appropriate procedures are required. WA DEC (2009) provides detailed information on the identification and sampling of acid sulfate soils.

3.5              Local geology and hydrogeology
The local and site-specific geological and hydrogeological settings influence the fate and transport of potential contaminants in the vicinity of and at the subject site.

The distribution of contaminants across a site is influenced by the local geology and natural or man-made/altered drainage features in the area or at the site. Their distribution within the sub-surface is influenced by geological structures, variations in the permeability of soil and rock (which may result in perched water tables), geochemical, biological and mineralogical variations and the presence of preferential pathways such as loose fill around services.

Certain sites may be located in areas that are naturally enriched with mineral resources and can appear to contain elevated levels of metals and metalloids in soil, surface water or groundwater. Consequently, it is essential to have an understanding of the background quality of these media and to evaluate potential contamination of this type of site in terms of the beneficial uses of the site and its water resources.

The geological/hydrogeological component of the desktop investigation may include review of the following types of published data:
    * surface elevation
    * regional and site-specific soil and geological records
    * geophysical data
    * drilling logs which clearly identify imported and locally derived