The York Potash Harbour Facilities Order 2016

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.