Implementing the Water Environment and Water Services (Scotland) Act 2003: Development of environmental standards and conditions limits

Implementing the Water Environment and Water Services (Scotland) Act 2003: Development of environmental standards and conditions limits - phase II: A Consultation

Additions to Table 1 of Part B of Schedule 1 to the 2007 Directions

Table 1: Dissolved oxygen standards for rivers

Column 1	Column 2	Column 3	Column 4	Column 5
	% oxygen saturation as 10-percentile values
River type	High	Good	Moderate	Poor
1, 2, 4 and 6 and salmonid	80	75	64	50
3, 5 and 7	70	60	54	45

Additions to Table 2 of Part B of Schedule 1 to the 2007 Directions

Table 2: Biochemical oxygen demand ( BOD) standards for rivers (i)

Column 1	Column 2	Column 3	Column 4	Column 5
	BOD concentration (mg/l) as 90-percentile values
River type	High	Good	Moderate	Poor
1, 2, 4 and 6 and salmonid	3	4	6	7.5
3, 5 and 7	4	5	6.5	9

Additions to Table 3 of Part B of Schedule 1 to the 2007 Directions

Table 3: Total ammonia standards for rivers

Column 1	Column 2	Column 3	Column 4	Column 5
	Total ammonia (milligrams of ammoniacal nitrogen per litre) as 90-percentile values
River type	High	Good	Moderate	Poor
1, 2, 4 and 6	0.2	0.3	0.75	1.1
3, 5 and 7	0.3	0.6	1.1	2.5

Additions to Table 4 of Part B of Schedule 1 to the 2007 Directions

Table 4: Acid condition standards for all river types

Column 1	Column 2	Column 3	Column 4
High	Good	Moderate	Poor
pH 6 as a 5-percentile value; pH 9 as a 95-percentile value	pH 5.2 as a 10-percentile value	pH 4.7 as a 10-percentile value	pH 4.2 as a 10-percentile value

Column 1

Column 2

Column 3

Column 4

High

Good

Moderate

Poor

pH 6 as a 5-percentile value;

pH 9 as a 95-percentile value

pH 5.2 as a 10-percentile value

pH 4.7 as a 10-percentile value

pH 4.2 as a 10-percentile value

Additions to Table 5 of Part B of Schedule 1 to the 2007 Directions

Table 5: Phosphorus standards for rivers

Column 1	Column 2	Column 3	Column 4	Column 5
	Soluble reactive phosphorus concentrations (µg/l) as annual mean values
River type	High	Good	Moderate	Poor
1n	30	50	150	500
2n	20	40	150	500
3n and 4n	50	120	250	1,000