Dry Creek Replacement Cleanfill, SH 58, Porirua - Hutt City Council

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Figures Figure 1 Site context .......................................................................................... 5 Figure 2 Vegetation Communities ................................................................ 11 Figure 3 LENZ ..................................................................................................... 15 Dry Creek Replacement Cleanfill, SH 58, Porirua | Assessment of Terrestrial Ecological Effects
1.0 Introduction Boffa Miskell has been engaged by Winstone Aggregates to prepare a terrestrial ecological assessment for a proposed cleanfill. Resource consent is being sought for the deposition of approximately 1.75 million m³ of clean fill at a new cleanfill site approximately 4 kilometres to the northwest of the current Dry Creek site off State Highway 58 (SH58). The cleanfill site is located on a farm property owned by Mr Malcolm Judd. This property is 336 ha in area. The cleanfill footprint will be approximately 13.9 ha in area and will be focussed within the lower sections of a large side gully of the property. The land will be leased to Winstone Aggregates as required. Figure 1 illustrates the extent of the proposed works associated with this application. The cleanfill application will fill a large area of the lower portion of the main gully and most of the smaller side gullies up to a finished contoured level, followed by formation of a new stream channel on the western side of the completed surface as described in the proposed ESCP. Following the completion of infilling, the finished surface will be re-vegetated as described in the application documentation. The proposed work includes removal of existing vegetation, topsoil stripping and bulk earthworks involving engineered filling. Associated with this work is the culverting of the side gullies as they are progressively filled. The following is an ecological assessment of the effects of the proposed cleanfill on the terrestrial ecology. The potential effects of this project on freshwater systems are the subject of a separate ecological assessment. 2.0 Methodology The assessment for this project was carried out in two stages. A preliminary assessment and desktop study was carried out for a proposed cleanfill site. This assessment highlighted areas of relatively high ecological value which was discussed with the applicant. The location of the cleanfill was then revised with a view to avoiding or minimising effects on these areas. A subsequent assessment was carried out of the new site layout which is the focus of this report. 2.1 Preliminary Assessment An initial familiarisation visit of the application site was undertaken with Winstone Aggregates staff, geotechnical engineering, landscape and visual and planning consultants on 24 November 2011. A more detailed site visit for this ecological assessment was undertaken on 24 February 2012. On this second visit the terrestrial ecology within and adjacent to the application site was described, and plant communities mapped. Pat Enright prepared the more detailed botanical species lists during the site visit (Appendix 1). The weather was fine and sunny on this site visit and followed heavy rain and NW winds in the previous 24 hours. Dry Creek Replacement Cleanfill, SH 58, Porirua | Assessment of Terrestrial Ecological Effects 3
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Page 3: CONTENTS 1.0 Introduction 3 2.0 Met
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Page 19 and 20: combined have an area of 0.7 ha. Th
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Dry Creek Replacement Cleanfill, SH 58, Porirua - Hutt City Council

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