Part A - EIA 400 kV OHTL Stp - мепсо а.д.

Environmental Impact Assessment Study for 400 kV OHL SS Stip – Macedonian-Serbian BorderRiver BregalnicaOrganoleptic indicators at both measuring locations show values for I – IV class. Here thewater is more frequently muddy.From acidity indicators, pH has values for I class at both measuring locations.Alkalinity has the value for I – II class at the measuring location Dolen Balvan, while at themeasuring location Ubogo, it has the values for I class.Indicators of oxygen regime show that the oxygen more often reaches the values for the Iclass water. The saturation with oxygen has the following values: 83.8 – 132.3% O 2 at thelocation Dolen Balvan, and it is estimated as IV-II class, while at the location Ubogo, it variesbetween 83.1 - 121.1 % O 2 Biological consumption of oxygen varies from 1.25 - 11.5 mg/l O 2at the location Dolen Balvan, to 2.0 – 22.5 mg/l O 2 at Ubogo. Thus, in the upper flow of theriver, this paramtere has value for III - IV class, while in the lower flow, at Ubogo, there isdeterioration of the quality, with value for IV – V class.The total quantity of dissolved substances more often have value for the I class, while thetotal suspended substances has the values for IV – V class at the measuring location DolenBalvan. In the lower flow of River Bregalnica, at the measuring location Ubogo, the totaldissolved substances have values for II class, while the total quantity of suspendedsubstances - for III – IV class.Indicators of eutrofication at both measuring locations have values for the II class.Chemical indicators of fecal pollution have values for I – II class, except for the nitrite ion,which at both measuring locations has values for III - IV class. The examined chemical andtoxic substances have values for the I - II class. At the measuring location Dolen Balvan, themangane more often has values for III - IV class, while the cadmium temporarily occurs withvalues for III - IV class.River PchinjaIndicators for the oxygen regime show that the dissolved oxygen at both measuring locationsmore frequently has values for the I class, with maximum average annual concentrationabove 10 mg/l. Biological five-day consumption of oxygen is adequate to III—IV class.At both measuring locations, the chemical consumption of oxygen varies between 2.6 mg/l to5.0 mg/l, which corresponds to II class.Indicators of eutrofication at the masuring location Katlanovo Spa corresponds to water withmoderately to increasingly eutrophic character, compared to the measuring location Pelince,where the water is of I - II class.Concerning the dangerous and harmful substances, the quality of water in River Pchinjacorresponds to I – II class.75