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e e e ?ltU'B~ 7flA7S'ie e 7flS~'l'BSS ';'1'ie?le e (~ ~ o/ tk ~ B'f/UW4) e ""~ °' ~ 'P~ ~ e 'il!!ekua#t to. th- '?~ Z>~ ol th Seu e e e e e e e e e e e e e 711. e 4099 ~ 199S 452 WER e v.2 e _Management of Project: The overall management of this study was overseen by a Project Steering Group which comprised the following people: • Graham Addison (Chairperson), Manager, Werribee Farm, • Melbourne Water • Hanle Moritz, Operations Engineer, Werribee Farm, Melbourne Water • Andy Puskas, Director Planning and Development, City of Werribee • Tony Murphy, Strategic Planning Group, Maribyrnong Region, Melbourne Water • Gary Pendlebury, Consultant Development Manager, Property Division, Melbourne Water Principal support consultants responsible for advising the Project Steering Group and for the coordination of the project included: • Roz Hansen, Director, Henshall Hansen Associates • David Hunter, Director, Coomes Consulting Group Pty Ltd • Two volumes of the report: The findings of this project are documented in two reports: (1) The Main Report which addresses the strategic planning considerations relevant to the future development of the site and which includes (in Chapter 5) a summary of more detailed information provided in a number of background reports prepared for the project. The Main Report includes an executive summary and recommendations. (2) A second volume titled "Accompanying Reports", which contains the reports prepared by specialist consultants concerning particular matters which are relevant to the future planning and development of the Melbourne Water site. Report Preparation: The following consultants were responsible for preparing the reports comprising this project: Main Report: Henshall Hansen Associates Planners and Economists Infrastructure Library 332 Rae Street, North Fitzroy, 3068 Accompanying Reports: Report 1: Site Contamination and Odour Assessment - Sinclair Knight, Consulting Engineers Report 2: Perceptions of Residents and Intending Purchasers - Motive Market Research Pty Ltd Report 3: Residential Land Market Study - Chris Runting and Associates Pty Ltd Report. 4: Social Planning Considerations - McVicar Reynolds Pty Ltd Report 5: Services Investigation and Development Report - Coomes Consulting Group Pty Ltd , • Report 6: . Traffic Engineering Assessment - Turnbull Morgan Pty Ltd e e e •e •e • This document includes the following accompanying reports: e Report 1: Site Contamination and Odour Assessment - Sinclair Knight, e Consulting Engineers Report 2: Perceptions of Residents and Intending Purchasers - Motive - Market Research Pty Ltd Report 3: Residential Land Market Study - Chris Runting and Associates e Pty Ltd e Report 4: Social Planning Considerations - Mc Vicar Reynolds Pty Ltd e Report 5: Services Investigation and Development Report - Coomes e Consulting Group Pty Ltd e Report 6: Traffic Engineering Assessment - Turnbull Morgan Pty Ltd e e e e e e e e e e e e e- e e e e e e e e '-"311/.SS3SS~ af,1U}(Z() au,~ ~~uwrJ 31-US 9 - I 1-Wd3?t e e e e e e e e e e e ..------------·- · ···~·' " . • .... •• ... .... , ·- - ·- ---· M- - • • ·- OO • •H•- MelboumeWater e February 1993 e -e Site Contamination and Odour Assessment e Werribee Treatment e Complex, e Werribee e e e e e - SINCLAIR KNIGHT -e CONSUL TING ENGINEERS e e e e e e e Contents 1. Introduction 1 e 1.1 Background 1 1.2 Site Description 1 e 1.3 History and Land Use 1 2. Contamination Assessment Description 3 e 2.1 Sampling Locations and Procedure 3 2.2 Sampling Schedule 4 2.3 Quality Assurance/Quality Control 5 -e 2.4 Groundwater 5 3. Contamination Assessment Results and Discussions 6 3.1 Geology and Subsurface Profile 6 e 3.2 Soil Quality Guidelines 6 3.3 Discussion of Results 6 e 3.3.1 Organics 7 3.3.2 Metals 8 3.3.3 Other Indicators 9 e 3.4 QA/QC Results 1O 4. Contamination Assessment Conclusions and Recommendations 12 -e 4.1 Soil Contamination Assessment 12 5. Odour Impact Assessment Description 14 e 5.1 Background Information 14 5.2 The Werribee Treatment Complex 14 - 5.3 Odour Modelling 15 6. Odour Impact Assessment Results and Discussions 18 e 6.1 After Completion of Currently Approved Capital Works 18 e 6.2 After Completion of All Planned Capital Works 19 7. · Odour Impact Assessment Conclusions and Recommendations 20 e 7.1 Conclusions and Recommendations 20 e Appendix A - Profile Description e e Appendix B - Laboratory Analysis Reports e e e e e 1. Introduction 1.1 Background e Sinclair Knight was engaged by Melbourne Water to conduct a preliminary contamination and odour assessment of the parcel of land forming the part of the Werribee Treatment Complex (WTC) north of the e Maltby Bypass and surrounding the WTC Administration Building. The purpose of the investigation was to assess potential soil e contamination on the site and odour emissions from nearby sewage treatment facilities, to determine the feasibility of rezoning the area from e PP-18 (Melbourne Water) to residential. e The objectives of the preliminary investigation were to:- o assess soil conditions on the site in respect to any contaminants e potentially associated with past land use; and o assess the impact of odour emissions from the WTC on the site now e and in the foreseeable future. e 12 · Site Description The site forms part of the Werribee Treatment Complex, bound to the north-east by the Werribee River, to the west by the Geelong Road and to the south-east by the Maltby Bypass. The site is irregular in shape and - occupies an area of approximately 200 hectares (Figure 1: Site Location e Plan). Vegetation on the site is dominated by pasture grasses, including rye grass and clover. Rows of mature eucalypts are located along a number e of boundary fences. The site is divided into paddocks and is intersected through its centre by New Farm Road, and Old Farm Road in its northern e section. The site is approximately level. Existing surface features include the e former aircraft hangers, workshop and a number of residences located in the northern section of the site. e 1.3 History and Land Use The following site land use history was compiled from information obtained from aerial photographs, Melbourne Water records and -e representatives of Melbourne Water based at the WTC. The section of the site west of Farm Road has been in Melbourne Water ownership since the 1920s. Land east of Farm Road was acquired in e 1927 (southern portion) and in the 1940s (northern portion). From 1938 e to 1945 the northern-most section of the site was used as a temporary e -~:• .~ . r rri Cl e rri z 0 CllZ~ -<o °' *~~~ n VI :r ,-, -~)> VI .... o,.... .., )> 9§ ~a .,, ,....~........ CD,-, r ...( -~ e Royal Australian Air Force (RAAF) base. e While utilised as an RAAF base a number of buildings were constructed on the site, comprising five aircraft hangars on the western and eastern boundaries of the northern section of the site, a fuel compound, fuel storage tanks, battery, armament and accommodation huts and ablutions - with associated septic tanks. e With the exception of the five hangars and a former workshop now called the 'sheep hangar', all buildings have been demolished and removed. e However, slab foundations to the former administration building, accommodation huts and a workshop immediately east of Hangar 1 e remain. All hangars located on the site are still in use, as detailed below:- o Hangar 1 - storage of pumping equipment, temporary storage of e SECV transformers, storage of deep sewer gear o Hangar 2 - storage of tunnelling and other construction equipment o Hangar 3 - storage of agricultural equipment e o Hangar 4 - timber storage/prefabricated concrete construction and storage e o Hangar 5 - carpentry shop/timber treatment For a period from 1945 to the early 1950s, the former airforce - accommodation huts were used as a hostel for European immigrants. Since Melbourne Water assumed ownership, the site, with the exception e of activities conducted in the storage hangars, has been mainly used for grazing purposes. e Until the Maltby Bypass was constructed in 1958, the southern-most section of the site was periodically irrigated with effluent from the vVTC. Since the mid 1970s, seven residences providing accommodation for Melbourne Water employees were constructed or relocated from the Upper Yarra Reservoir and are situated in the northern-most portion of the site. · e Timber preservation treatment with copper chrome arsenate (CCA) was conducted between the late 1960s to the mid 1980s in Hangar 5. Treated e timber was stored in the yard east of this hangar. Remnants of a stockpile of treated hardwood logs is still stored in this area. e For a period during the mid 1980s a number of disused electrical transformers containing polychlorinated biphenyl-based cooling oil were stored on a concrete apron located at the northern end of Hangar 1. e These were disposed of by high temperature incineration overseas. e 'I e e e 2. Contamination Assessment Description 2.1 Sampling Locations and Procedure e On 8 December, 1992 a soil sampling program was carried out on the e site. A total of twenty-six boreholes were completed on a loose herringbone e grid and targeted basis. Targeted locations included the former fuel tanks, fuel store, battery store and Hangars 1 and 5 where potential soil contamination may have resulted from past uses. Borehole locations are e shown in Figure 2: Borehole Location Plan. e For each borehole location samples were taken at the following depths:- o A sample 0-0.2m depth e o B sample - 0.2-0.Sm depth e From the twenty-six boreholes completed, a total of fifty-two samples were taken. Four samples were individually analysed and twenty-one samples were used to form seven three-way composites.