Document ID: chunk:federal_register_of_legislation:F2020L01339:reg:372:p23
Version: federal_register_of_legislation:F2020L01339
Segment Type: reg
Provision Reference: reg 372 (pt 23/62)
Character Range: 211788–214723

and 2011 by the Harbour Trust in accordance with the Remediation Technical Specification and Remediation Action Plan (RAP) prepared by GHD.

In August 2011, the site was signed off by an accredited site auditor as suitable for residential, parks and recreational open space (Site Audit Statement, prepared by Dr Ian Swane and dated 22 August 2011). Overall comments from the site auditor are detailed below:

    1. This site audit statement should be read in conjunction with the site audit report.

  2.       The soils at the Macquarie Lightstation precinct were contaminated by the weathering of lead-based paint from the external surfaces of heritage structures and operations at the site that resulted in fill being impacted by lead, zinc, polycyclic aromatic hydrocarbons (PAHs), petroleum hydrocarbons and dieldrin.

  3.       The unsealed areas of the site were remediated by excavating 2,187m3 of contaminated soil and disposing at suitably licensed waste depots.

  4.       Some localised contamination may remain in the remediated and unremediated areas. However, the available data indicate the levels and extent are not significant.

  5.       Some capped areas remain in unsealed areas of the site. These areas are where large Norfolk Pines remain in the north-western corner of the Assistant Keeper's Quarters and a strip of the soils remaining between the eastern side of the present lighthouse and the footings of the original lighthouse. All contaminated soils that could be were removed from these areas then capped with a geotextile marker fabric, clean topsoil and grassed.

  6.       An old gas supply pipeline is likely to remain in the unremediated south-western portion of the lighthouse area along the alignment shown in the 1883 site plan.

  7.       Sealed areas of the site were not investigated or remediated because of the need to preserve the heritage structures and/or there is no exposure pathway while these areas remain sealed. These areas include buildings, bitumen driveways and hard-surface landscaped areas.

  8.       The contamination that remains capped in these sealed areas is to be managed by means of the Coffey EMP.

  9.       Care should be taken when excavating near property boundaries because contaminated fill is likely to be present on adjacent sites (eg. Christison Park to the south, Lighthouse Reserve to the north, and the nature strip along Old South Head Road).

  10.   Groundwater at the site should not be extracted unless testing is undertaken to confirm its suitability for the proposed beneficial uses.

6.6. Residual Site Contamination

The residual contaminated soil and fill is located in relatively small areas of the site. It remains in situ to protect the site's significant heritage structures, or where full removal of the contamination was not practicable, or where the soils are already adequately capped by existing sealed surfaces such as pavements