Water Quality in Slovenia - Agencija RS za okolje

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62 3.3 W A T E R Q U A L I T Y I N S L O V E N I A Table 18: Monitoring sites with the most polluted groundwater Groundwater body Savinjska kotlina Krška kotlina Dravska kotlina Murska kotlina Monitoring site Parameter Concentration (AM) AM/QS LEVEC VC-1772 nitrates 58.8 mg NO 3 /L 1.2 metolachlor 0.32 µg/L 3.2 terbuthylazine 0.10 µg/L 1.0 desethyl-terbuthylazine 0.15 µg/L 1.5 total pesticides 0.68 µg/L 1.4 tetrachloroethene 3.08 µg/L 1.5 CERKLJE C-01 nitrates 50.2 mg NO 3 /L 1.0 bentazone 1.05 µg/L 10.5 total pesticides 1.17 µg/L 2.3 BRUNŠVIK 1750 nitrates 109.5 mg NO 3 /L 2.2 atrazine 0.25 µg/L 2.5 desethyl-atrazine 0.17 µg/L 1.7 prometryn 0.39 µg/L 3.9 total pesticides 1.02 µg/L 2.0 ŠIKOLE 1581 nitrates 85.3 mg NO 3 /L 1.7 atrazine 0.24 µg/L 2.4 desethyl-atrazine 0.15 µg/L 1.5 bentazone 0.13 µg/L 1.3 total pesticides 0.51 µg/L 1.0 KIDRIČEVO 2571 nitrates 55.5 mg NO 3 /L 1.1 atrazine 0.88 µg/L 8.8 desethyl-atrazine 0.34 µg/L 3.4 total pesticides 1.23 µg/L 2.5 RAKIČAN 2500 nitrates 60.9 mg NO 3 /L 1.2 potassium 12.0 mg/L 1.2 atrazine 0.13 µg/L 1.3 1.2-dichloroethene 146.5 µg/L 73.3 tetrachloroethene 155.0 µg/L 77.5 trichloroethene 68.8 µg/L 34.4 LHCH 370.5 µg/L 37.1 LIPOVCI 2271 nitrates 110.3 mg NO 3 /L 2.2 LHCH: The sum of volatile halogenated aliphatic hydrocarbons AM: Yearly arithmetic mean of parameter in the monitoring site QS: Quality standard Trend Evaluation desethyl-atrazine 0.19 µg/L 1.9 The behaviour of an individual parameter over a longer period of time is represented by upward/ downward concentration trends. Long-term trends of pollutants’ concentration in a groundwater body are determined with a linear regression analysis of at least six-year sets of representative average values for a water body (AM ). On most occasions, pollution does not affect the entire water body, SK so more complete information on endangered groundwater is obtained if trends are determined with a linear regression of the annual arithmetic mean values at individual monitoring sites (AM). Remediation measures have to be carried out when the parameter’s upward trend reaches 75% of the quality standard. Due to a ban on the use of atrazine, a downward trend of this pesticide and its metabolite desethylatrazine has been established in the majority of groundwater bodies. Chart 12 shows a downward trend of the desethyl-atrazine concentration in the period from 1998 to 2006 in the Murska kotlina where, in 2005, representative average values (AM ) for the water body decreased below the quality SK standard of 0,1 μg/L. During the same period, the concentrations of desethyl-atrazine in the Krška kotlina water body have been increasing and almost reached the quality standard in 2006 (Chart 13)
G R O U N D W A T E R Chart 12: Trend of decreasing desethyl-atrazine concentration in the Murska kotlina in the years 1998 to 2006 �� Chart 13: Trend of increasing desethyl-atrazine concentration in the Krška kotlina in the years 1998 to 2006 �� With regards to nitrates, no explicit trend could be observed in the period from 1998 to 2006. In Chart 14, the average annual nitrate concentrations for all water bodies in alluvial aquifers are shown. During this period, the nitrate concentrations have been increasing in the Dravska and Krška kotlina, slowly decreasing in the Murska kotlina, while they remained at the same level in the Savinja and Savska kotlina. Chart 14: Changing of nitrate concentrations in alluvial groundwater bodies in the years 1998 to 2006 �� 63
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Water Quality in Slovenia
Page 4 and 5:
ENVIRONMENTAL AGENCY OF THE REPUBLI
Page 7 and 8:
Preface In recent years, people oft
Page 9:
Contents PREFACE ..................
Page 12 and 13:
10 W A T E R Q U A L I T Y I N S L
Page 15 and 16: 2 Surface Waters 2.1 2.1.1 Quality
Page 17 and 18: Ledava, Čentiba Mura, Mota S U R F
Page 19 and 20: S U R F A C E W A T E R S Exceeded
Page 21 and 22: S U R F A C E W A T E R S In Table
Page 23 and 24: S U R F A C E W A T E R S RIVER Mon
Page 25 and 26: Map 2: Saprobic quality evaluation
Page 27 and 28: S U R F A C E W A T E R S Chart 6:
Page 29 and 30: Lake Bohinj Table 5: List of water
Page 31 and 32: S U R F A C E W A T E R S In the ye
Page 33 and 34: Lake Bled S U R F A C E W A T E R S
Page 35 and 36: S U R F A C E W A T E R S Table 8:
Page 37 and 38: S U R F A C E W A T E R S species a
Page 39 and 40: ��
Page 41 and 42: S U R F A C E W A T E R S Map 5: Cl
Page 43 and 44: Soča, Čezsoča Nadiža, Robič Ba
Page 45 and 46: Map 7: Quality of bathing waters in
Page 47 and 48: S U R F A C E W A T E R S Compliant
Page 49 and 50: S U R F A C E W A T E R S Table 12:
Page 51 and 52: 2.4.4 Quality of Shellfish Waters S
Page 53: Strunjan S U R F A C E W A T E R S
Page 56 and 57: 54 W A T E R Q U A L I T Y I N S L
Page 58 and 59: 56 3.2 W A T E R Q U A L I T Y I N
Page 67 and 68: 4 Guidelines for Future Work - Wate
Page 69 and 70: 5 References 1. Directive 2000/60/E
Page 71 and 72: R E F E R E N C E S 55. Pravilnik o
Page 73 and 74: G L O S S A R Y O F T E R M S Hydro
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