Appendix 1 Restoration Condition Survey Data
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Information Classification: PUBLIC Appendix 1 Restoration Condition Survey Data Rocks ................................................................................................................................................... 3 Carloggas Downs ................................................................................................................................. 6 Baal...................................................................................................................................................... 8 Dubbers ............................................................................................................................................. 11 Carrancarrow .................................................................................................................................... 20 Cancarrow ......................................................................................................................................... 21 Goonbarrow ...................................................................................................................................... 23 Blackpool ........................................................................................................................................... 29 Hensbarrow ....................................................................................................................................... 30 Hendra .............................................................................................................................................. 33 Dorothy ............................................................................................................................................. 35 Scarcewater ...................................................................................................................................... 36 Gaverigan .......................................................................................................................................... 47 Park Pit, St Breward .......................................................................................................................... 48 Stannon China Clay Works ................................................................................................................ 50 United Mines Landfill ........................................................................................................................ 52 St Austell China Clay Restoration & Tipping Strategy Supplementary Planning Document DRAFT – Appendix 1 1 March 2021 Information Classification: PUBLIC This appendix looks at a number of sites identified on Figure 2 (Appendix 3). These sites were selected in agreement with Cornwall Council and Imerys Minerals Limited (IML) and following discussions with Natural England to cover the range of restored habitats within the China Clay Area. The surveys were undertaken during May 2018. The survey findings considered the establishment of vegetation through the use a standard scoring matrix, developed by Wardell Armstrong. Restoration that has passed the 5-year management plan are not necessarily monitored on a regular basis and therefore this study has assessed the long-term effectiveness of the restoration / habitat improvement works undertaken as part of those projects. The survey recording template includes the following data: • Date the survey was undertaken • The location and grid reference • The type of material present – sand, stent, mica or other • The aspect, slope (<20o, 20-30o, >30o), exposure (high, moderate, low) and altitude (<200m, 200m-300m or >300m). • Date of the restoration scheme • Main surface substrate • Planting method • Year of aftercare management plan, if any • Aftercare maintenance type • The presence of invasive species, the percentage of cover and any management techniques applied • Photos and comments • Assessment of the success (or otherwise) of any restoration measures 1. Successful – subject to ongoing management and maintenance 2. Successful – but not maintained or managed 3. Poor – subject to management but restoration is poor 4. Poor – unmanaged and restoration is poor 5. Unsuccessful – restoration has not succeeded The surveys are presented by Site Name rather than numerical order. St Austell China Clay Restoration & Tipping Strategy Supplementary Planning Document DRAFT – Appendix 1 2 March 2021 Information Classification: PUBLIC Rocks Site: 1 Date: 01/05/2018 Location: Rocks Easting: 202015 Northing: 058503 Details: Mine waste: Sand Aspect: SW Slope: 20-30° Exposure: Moderate Altitude: <200m Restoration: Date of restoration scheme: 2011, Surface substrate: Planting plugs Planting method: Plug/tree/hedgerow plantation Aftercare Aftercare Management Plan Period: None Maintenance: Woodland Invasive species Presence – Y % cover - <25% Effect: minimal managed Other comments: South west facing slope of Rocks – the slope can be partially viewed from the permissive path, although it is well screened by mature woodland at the base of the tip. Tree survival on the lower slopes is poor and has largely become overgrown with bramble and other understorey species. On higher slopes, tree survival is also poor with improved establishment from self-seeded birch and willow. Understorey of grass & moss is most common, with gorse prevalent in a proportion of the lower and middle slopes. Photos: Restoration success: 4. Poor – unmanaged. (for target habitat of woodland; tip slopes are largely revegetated there is potential for further natural recolonisation) Site: 2 Date: 01/05/2018 Location: Rocks Easting: 202494 Northing: 058139 Details: Mine waste: Sand Aspect: S Slope: 20-30° Exposure: Moderate Altitude: <200m Restoration: Date of restoration scheme: 2011 Surface substrate: Planting plugs Planting method: Plug/tree/hedgerow plantation St Austell China Clay Restoration & Tipping Strategy Supplementary Planning Document DRAFT – Appendix 1 3 March 2021 Information Classification: PUBLIC Aftercare Aftercare Management Plan: None Maintenance: Woodland Invasive species Presence – n Other comments: More sheltered aspect – oak, ash, and alder evident establishing slowly. Less evidence of invasive species. Good ground cover with grass and moss. Anticipated that woodland canopy will develop slowly. Photos: Restoration success: 2. Successful – not maintained/managed. Site: 3 Date: 01/05/2018 Location: Rocks Easting: 202615 Northing: 058141 Details: Mine waste: Sand Aspect: SW Slope: 20-30 Exposure: Moderate Altitude: <200m Restoration: Date of restoration scheme: 2011 Surface substrate: Planting plugs Planting method: Plug/tree/hedgerow plantation Aftercare Aftercare Management Plan: none Maintenance: Woodland Invasive species Presence – y % cover - 25-50% Effect: minimal managed Other comments: More sheltered and woodland successfully established on the slopes of the tip. Gorse is evident throughout, but trees are established. St Austell China Clay Restoration & Tipping Strategy Supplementary Planning Document DRAFT – Appendix 1 4 March 2021 Information Classification: PUBLIC Photos: Restoration success: 2. Successful – not maintained/managed. Site: 4 Date: 01/05/2018 Location: Rocks Easting: 202256 Northing: 058704 Details: Mine waste: Sand Aspect: NE Slope: 20-30° Exposure: Moderate Altitude: <200m Restoration: Date of restoration scheme: 2011 Surface substrate: Planting plugs Planting method: Plug/tree/hedgerow plantation Aftercare Aftercare Management Plan: none Maintenance: Woodland Invasive species Presence – n Other comments: The slope was not accessible, however this north facing slope demonstrates a successful planting scheme that is now well established, with willow in foreground – no access on this side of the tip. Photos: Restoration success: 2. Successful – not maintained/managed. St Austell China Clay Restoration & Tipping Strategy Supplementary Planning Document DRAFT – Appendix 1 5 March 2021 Information Classification: PUBLIC Carloggas Downs Site: 5 Date: 01/05/2018 Location: Carloggas Downs Easting: 202253 Northing: 058712 Details: Mine waste: Sand Aspect: NE Slope: <20° Exposure: Moderate Altitude: <200m Restoration: Date of restoration scheme: 2011 Surface substrate: Sand Planting method: Hydroseeding Aftercare Aftercare Management Plan: none Maintenance: Agricultural, Woodland, Scrub clearance, grazing Invasive species Presence – n Other comments: Adjacent to main permissive path, habitat illustrates evidence of good heather cover with fescue / moss ground cover, little or no encroachment of invasive species. Photos: Restoration success: 2. Successful – not maintained/managed. Site: 6 Date: 01/05/2018 Location: Carloggas Downs Easting: 20187 Northing: 056549 Details: Mine waste: Sand Aspect: NE Slope: <20° Exposure: Moderate Altitude: 200-300m Restoration: Date of restoration scheme: 2011, 2012, 2013, 2014, 2015, 2016, 2017 Surface substrate: Sand Planting method: Hydroseeding Aftercare Aftercare Management Plan: none St Austell China Clay Restoration & Tipping Strategy Supplementary Planning Document DRAFT – Appendix 1 6 March 2021 Information Classification: PUBLIC Maintenance: Agricultural, Woodland, Scrub clearance, grazing Invasive species Presence – y % cover - 50-75% Effect: unmanaged Other comments: Typical view of habitat from main permissive path, bramble and gorse have encroached in habitat, heather is largely smothered in places. Photos: Restoration success: 4. Poor – unmanaged. St Austell China Clay Restoration & Tipping Strategy Supplementary