AECOM New Zealand Limited Level 2, 2 Hazeldean Road Addington, Christchurch 8024 P O Box 710, Christchurch MC Christchurch 8140 New Zealand www.aecom.com +64 3 966 6000 tel +64 3 966 6001 fax \\na.aecomnet.com\lfs\apac\christchurch-nzchc1\legacy\projects\605x\60544823\6. draft docs\6.1 reports\waihi north\app d - kinetic and column testing\appendix d - attachment a.docx 1.0 Introduction and Background The purpose of this memorandum is to outline the specifications, set up and operational procedures for field column tests operated by Oceana Gold at the Martha Mine Site for investigating leachate water quality. Data gathered will aid defining a methodology for backfill placement (including any limestone placement), to mitigate or minimise the groundwater effects that result from inundation of the backfilled Gladstone pit. 2.0 Column Specifications. Seven existing columns on site (dimensions approximately 800 mm high, 300 mm diameter equalling a total volume of approximately 0.057 m3 each) will be utilised for the WNP field columns. The existing columns should be prepared for use by thoroughly emptying and cleaning, replacing all tubing and buckets (with sealed lids) with food grade plastic and setting up the columns as outlined in Figure 1 and specified in this document. Memorandum To Kathy Mason Page 1 CC Linda Graveson Subject Attachment A – Column Testing Operating Procedure From Tim Mulliner File/Ref No. 60544823 Date 09-Jun-2017
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