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Alliance Geotechnical


Academic year: 2023

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Alliance Geotechnical Pty Ltd (AG) was engaged by Northrop Consulting Engineers P/L to carry out a Phase 1 Preliminary Site Investigation (PSI) for 172 Showground Road, Castle Hill NSW (see Figure 1 with the 'site' boundaries outlined in Figure 2) . The site is proposed to be redeveloped, including a new storage facility for the Museum of Applied Arts and Science; and. A site contamination assessment is required to assess the suitability of the site for the proposed land use scenario.

Assess the potential for contamination that may be present at the site as a result of past and current land use activities; Provide advice on whether the site would be suitable (in the context of land contamination) for the proposed land use designation; and. Further assessment of the identified AEC, and subsequent management/remediation of the identified unacceptable soil contamination risks (if warranted), will be required to confirm the suitability of the land use (in the context of soil contamination) for the proposed redevelopment works.

A Level 2 Detailed Site Investigation (DSI) should be carried out for identified areas of environmental concern; In the event that identified areas of environmental concern are not accessible during Phase 2 of the DSI, consideration should be given to preparing a Remedial Action Plan (RAP) that identifies what additional assessment work would be required;




Scope of Work




Acid Sulphate Soils




  • Land Titles
  • Aerial Imagery
  • Anecdotal Information
  • Incident Reports
  • Complaints History
  • Previous Contamination Assessments

SITE HISTORY AND LAND USE 4.1. Phase 1 Preliminary Site Investigation 8325-ER-1-1. Alliance Geotechnical Pty Ltd - Manage the Earth, Eliminate the Risk. 2004 More buildings appeared in the north of the site, along with associated parking lots, and some buildings in the southwest corner appeared. The aerial survey indicated that soil polluting activities may have been undertaken, specifically uncontrolled demolition of the structures between 2004 and 2019.

Further evaluation of localized demolition activities related to former dwellings throughout the site, in the context of other historical information identified during this investigation and field walk observations, is considered warranted.


NSW EPA CLM Act Record of Notices

NSW EPA POEO Act Register of Licences, Applications and Notices

NSW EPA CLM Act Register of Notified Sites

Section 10.7 Planning Certificate

SafeWork NSW Stored Chemical Information Database (SCID)


  • Current Land Use Activity
  • Buildings and General Infrastructure
  • Boundary Fencing
  • Adjacent Land Use Activities
  • Odours and Staining
  • Chemical Storage
  • Underground and Aboveground Storage Tanks
  • Filling Material
  • Wastes
  • Asbestos Containing Materials
  • Phytotoxicity
  • Site Drainage

There were no olfactory signs of odors or visual signs of staining observed on the surface of the site, during the site walkover. No visual evidence of significant or widespread chemical storage at the site was observed during the site review. There was no visual evidence of the presence of underground or above-ground storage tanks at the site.

No visual evidence of significant or widespread waste material stored at the site was observed. No visual evidence was observed indicating significant or widespread phytotoxic effects (in the form of dieback or plant stress) in the vegetation at the site.



  • Areas of Environmental Concern
  • Land Use Setting
  • Direct Contact – Human Health
  • Inhalation / Vapour Intrusion – Human Health
  • Aesthetics – Human Health
  • Ecological Health - Terrestrial Ecosystems
  • Management Limits for Petroleum Hydrocarbon Compounds

The AG notes that the proposed development includes building footprints and hard surface pavement areas across most of the site, which would act as a direct contact barrier between potential soil contamination and on-site receptors during the operation of the site. In these areas, it is assessed that there may be a direct contact exposure pathway between potential contamination and receptors on site. The historical evidence reviewed indicated a low probability that a potential primary source was present at the site.

No potential sources of groundwater pollution were observed in the immediate vicinity of the site. Due to the visual observations made during the site visit and the nature of the proposed development concept, the AG believes that further aesthetic assessment and management is warranted for the site. Due to the lack of open space areas, further ecological assessment is not considered justified.

Application of the management limits requires consideration of site-specific factors, such as the depth of basements and building services and depth to groundwater, to determine the maximum. NEPC (2013) also notes that management limits may be less relevant at industrial sites that have no or limited sensitive receptors in terms of potential impact, and when management limits are exceeded further site-specific assessment and management may allow any identified risk to be addressed.



4 DP1045464 EASEMENT TO DRAIN WATER 5 METER(S) WIDE AND VARIABLE BELONGING TO THE ABOVE DESCRIBED LAND. SEPP (Housing For Seniors Or People With A Disability) 2004. 2) The name of each proposed environmental planning instrument that will apply to the implementation of the development on the land and which is or has been the subject of public consultation or public exhibition under the Act ( unless the Secretary has notified the Council that the preparation of the proposed instrument has been postponed indefinitely or has not been approved). Any amendments to the proposed State Environmental Planning Policy (Growth Centers in the Sydney Region) 2006 (Schedule 11 The Hills Growth Center Precincts Plan). F) Whether the land includes or includes critical habitat.

State Environmental Planning Policy (Growth Centers in the Sydney Region) 2006 (Appendix 11 Hills Growth Center Area Plan). G) Whether the land is in a conservation area (however described). State Environmental Planning Policy (Growth Centers in the Sydney Region) 2006 (Appendix 11 Hills Growth Center Area Plan). H) Whether the object of environmental heritage (regardless of the description) is located on the land. Conforming development may be carried out on the land in accordance with the Residential Alterations Code and the General Building Code.

Sufficient development under the Commercial and Industrial Code (new buildings and additions) may not be carried out on the land unless the. Adequate development in terms of the commercial and industrial alterations, container recycling facilities, subdivision, demolition and fire safety codes can be carried out on the land. Whether the land is proclaimed as a mine subsidence district within the meaning of section 15 of the Coal Mine Sinkage Compensation Act 2017.

Whether or not the land is affected by a road widening or realignment of roads below. The Hills Local Environmental Plan 2012 indicates that the land is earmarked for widening the "Classified Road". Policy of the Council and other government agencies on risk reduction Whether or not the country is affected by a policy:.

If the land is a biodiversity management site under a biodiversity management agreement under Part 5 of the Biodiversity Conservation Act 2016 (but only if the council has been notified of the existence of the agreement by the Chief Executive of the Office of Environment and Heritage). Whether the land contains a set-aside under section 60ZC of the Local Land Services Act 2013 (but only if the council has been notified of the existence of the set-aside by Local Land Services or it is recorded in the public register under this section ). Whether there is a valid Certificate of Facility Compatibility (Infrastructure) or Certificate of Facility Compatibility (Schools or TAFE establishments) that the Council is aware of in respect of proposed development on the land.

Whether there is a valid location verification certificate known to the council in relation to the land. Check the NSW Fair Trading website at www.fairtrading.nsw.gov.au to confirm that the land is not listed on this register. Affected building notices and building product rectification orders (1) Whether there is any affected building notice of which the council is aware and which applies to the land.

Whether there is a building product rectification order that the municipality is aware of that applies to the plot and has not been fully complied with.


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