13.2 182
Embedded Mitigation
The main river crossings of Martlesham Creek and The Deben would be crossed by HDD techniques. HDD used for Kirton Creek and River Gipping crossing. Where possible spoil would be set back 5m from watercourses to minimise potential for silt run off from the working width.
183
To reduce the impact of uncontrolled runoff from the site during construction the following measures to reduce the potential impact of the works in the event of an extreme rainfall event would be implemented:
Where possible, stockpiles of excavated materials would be placed away from the drainage system to minimise the potential for silt that may be mobilised entering the drainage network
Gaps would be provided at intervals in the stockpiles to act as water pathways, to ensure that floodwater movement is not hindered and surface water flooding is not exacerbated
No fuel or other hazardous substances would be stored within close proximity to the drainage network and where possible mobile plant would be parked within designated compounds at night or when not in use.
13.3
Additional mitigation Pre-construction
184
Liaison would take place with the Environment Agency, Lead Local Flood Authority and Internal Drainage Board as required to agree a methodology for each watercourse crossing. As part of this the Environment Agency would assess any issues associated with fish and crossing. If necessary a fish rescue programme would be implemented, the method for which would be agreed with the Environment Agency.
185
Periods of low flow would be chosen wherever practicable. This would result in a quicker deposition from the water column of any sediment released.
During Construction 186
After the ducting is installed the trench would be backfilled.Where possible, open-cut watercourse crossings, including backfill and temporary reinstatement, would be completed in one day.
Outline Landscape and Ecological Management Strategy. Version 2 Page 49
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68 |
Page 69 |
Page 70 |
Page 71 |
Page 72 |
Page 73 |
Page 74 |
Page 75 |
Page 76 |
Page 77 |
Page 78 |
Page 79 |
Page 80 |
Page 81 |
Page 82 |
Page 83 |
Page 84 |
Page 85 |
Page 86 |
Page 87 |
Page 88 |
Page 89 |
Page 90 |
Page 91 |
Page 92 |
Page 93 |
Page 94 |
Page 95 |
Page 96 |
Page 97 |
Page 98 |
Page 99 |
Page 100 |
Page 101 |
Page 102 |
Page 103 |
Page 104 |
Page 105 |
Page 106 |
Page 107 |
Page 108 |
Page 109 |
Page 110 |
Page 111 |
Page 112 |
Page 113 |
Page 114 |
Page 115 |
Page 116 |
Page 117 |
Page 118 |
Page 119 |
Page 120 |
Page 121 |
Page 122 |
Page 123 |
Page 124 |
Page 125 |
Page 126 |
Page 127 |
Page 128 |
Page 129