Capital dredging and disposal
6.—(1) The undertaker is permitted to carry out capital dredging at the following locations—
(a)the current approach channel to a depth of 14.1 metres below Chart Datum (16.95 metres below Ordnance Datum); and
(b)the berth pocket to a depth of 16 metres below Chart Datum (18.85 metres below Ordnance Datum).
(2) The materials must be dredged in the approximate quantities according to the following table—
| Dredged material type | Open quay (cubic metres) | Solid quay (cubic metres) |
|---|---|---|
| Silts | 181,000 | 66,000 |
| Sands and Gravels | 326,000 | 196,000 |
| Clays | 230,000 | 194,000 |
| Mercia Mudstone | 385,000 | 358,000 |
| TOTAL (MAXIMUM) | 1,122,000 | 814,000 |
(3) For phases 1 and 2, the dredging of the contaminated silts is to be undertaken using enclosed grabs.
(4) For phase 1 the dredging of the sands and gravels is to be undertaken using a Trailing Suction Hopper Dredger (“TSHD”).
(5) For phases 1 and 2 the dredging of the clay and Mercia mudstone (marl) must be undertaken using a backhoe dredger, TSHD or Cutter Suction Dredger (“CSD”). For phase 2, dredging of sands and gravel is to be by a backhoe dredger, TSHD or CSD.
(6) The following maximum quantities of dredged material are to be disposed at Tees Bay C (TY 150) offshore dredged material disposal sites—
(a)615,000 cubic metres of clay and mudstone; and
(b)326,000 cubic metres of sand and gravel,
unless otherwise agreed with the MMO.