Waihi North Project Preliminary Site Investigation (Ground Contamination) Williamson Water & Land Advisory Limited 42 3.7 Willows Road property Site description summary The site is an operating dairy/dry stock farm. As well as a dwelling there are a range of sheds including a dairy shed, woolshed, implement shed, hay barn and yards. The dairy shed and dwelling have potential ACM. Buildings are clustered in the east of the site. Proposed developments The site will undergo significant modification. Most of this will be confined to the southern half of the site, although largely to the north of the HAIL features discussed in Table 9 below. Willows Road Farm will eventually host the portal to the new Wharekirauponga mine, a rock stockpile and a topsoil stockpile, stormwater holding ponds, explosives storage, and surface infrastructure including amenity buildings, workshops, etc. The remainder of the farm will be unmodified. Site history summary The site has been used for dairying/ livestock grazing for most of its history, with progressive bush clearance occurring over the past 70 years. We have considered all potential contaminating (HAIL) activities for the Willows Road property in Table 9 and these are as shown on Figure 17. Table 9. Potential for contamination: Willows Road Farm Land use Potential contaminants Possible extent of contamination HAIL Assessment Areas potentially impacted Drench use in yards and storage in sheds HAIL Activity A8: Livestock dip or sprayrace operations Arsenic, organochlorines Livestock dips are not evident but use of sprays on animals is likely. Any contamination is likely confined to surface soils in the immediate vicinity of the yards. HAIL Activity A8 applies to site. Cattle yards/ sheds Asbestos use in buildings HAIL Activity E1: Asbestos in a degraded condition Asbestos There is potential for ACM to be present in the facia boards on the dairy shed. If contamination is confirmed, it is likely confined to surface soils immediately surrounding the buildings. HAIL Activity E1 applies to the site. Immediately surrounding the buildings. Effluent application to land HAIL Activity G5: Waste disposal to land Biological contaminants Dairy effluent is collected in a pond and irrigated over approximately 10ha. While biological contaminants are likely present in the effluent, in our experience they are short lived and unlikely to present a risk to human health or the environment, so long as good irrigation practices are followed. HAIL Activity G5 applies to the site. Paddocks where irrigation occurs, the irrigation pond itself.
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