According to the researches, the water level in the Goryn River (above the Baltic Sea level) fluctuated within a month from 192.58 m to 192.59 m in December, 2019 (the minimum value is 192.57 m; the maximum value is 192.61 m; the average is 192.59 m):

In December 2019, the temperature of water in the Goryn River varied from 3.1°С to 2.7°С during the month (minimum value is 2.3; maximum value is 4.8; average is 3.0):

In December 2019, the water flow in the Goryn River changed from 5.64 to 6.00 m³/s during the month  (the minimum value was 5.64; the maximum value was 6.40; the average was 5.92):

Note: The calculation  of the flow rate in the Goryn River includes the coefficient taking into account the presence of algae (the calculation is performed according to the appropriate method).

The total flow of the Goryn River amounted to 15.9 million m³ in December 2019 (December 2018 - 19.9 million m³) .

The water level of the reservoir-cooler (at the design level of 203.0 m above the Baltic Sea level)  varied from 201.58 to 201.64 meters during the month in December 2019 (the minimum value is 201.56, the maximum value is 201.64, the average - 201.59):

The mirror area of the cooling pond was 17.624 km², the volume of water was 93.460 million m³ at the end of the month.

In December 2019, the temperature of the water in the cooling pond varied from 7.6°C to 4.8°C during the month (minimum value is 4.3, maximum value is 9.4, average - 7.0):The chemical analysis data of water quality in the reservoir-cooler (the pump station of auxiliary water) and in the Goryn River (near the Old Mill, Netishyn) were as follows in December:

Indicator	Cooling pond	Goryn River	MAC*
Solidity general, mg-equv/dm3	5.05	6.40	-
Calcium (Са2+), mg/dm3	65.1	96.2	180
Magnesium (Mg2+), mg/dm3	21.9	19.4	40
Sodium (Na+), mg/dm3	96.0	12.7	120
Potassium (K+), mg/dm3	10.9	4.7	50
Bicarbonates (HCO3-), mg/dm3	298.9	341.6	-
Carbonates (CO32-), mg/dm3	3.0	0	-
Dry residues, mg/dm3	542	340	1000
Sulfates (SO42-), mg/dm3	138.3	36.0	100
Ammonium, (NH4+), mg/dm3	0.41	0.28	0,5
Nitrates (NO3-), mg/dm3	0.69	6.62	40
Nitrites (NO2-), mg/dm3	< 0.020	0.059	0,08
Phosphates (PO43-), mg/dm3	0.80	0.20	0,25
Oil products, mg/dm3	0.024	0.029	0,05
Synthetic surfactants, mg/dm3	0.050	0.025	0,1
Iron, mg/dm3	< 0.10	< 0.10	0,1
Permanganate oxidability, mgО/dm3	9.12	3.52	-
Dissolved oxide (O2), mg/dm3	10.72	11.72	>4

Notes: Standard MAC (maximum allowable concentration) is applied for water objects of industrial fishing (the Goryn River pertains to them) - «Rules of superficial water protection».

According to the data of chemical analysis results mentioned above, the water quality of the reservoir-cooler in December was better than the water quality in the Goryn River regarding some coefficients.

The main water balance components of Khmelnitsky NPP cooling pond are listed in the table below:

Component	December 2019	December 2018
WATER INPUT
- Outflows from the Hnylyi Rih River, mln. m3	0.394	1.088
- Horyn River water pumped to KhhNPP cooling pond by the makeup water pumping station, mln. m3	1.160	N/A
- Return water from the drainage line to KhhNPP cooling pond pumped by the leakage water pumping station, mln. m3	1.397	1.610
- Treated effluent water, mln. m3	0.315	0.306
WATER OUTPUT
- Return water to the Viliia River (Horyn River basin), mln.m3	N/A	N/A

Over December, emission of pollutants into the atmosphere was in compliance with the limits established for stationary pollution sources. Thus, the pollutant emission standards were not exceeded. The generalized information on pollutants emission is given below in the table.

Emission	December 2019	December 2018
Pollutants (without СО2), t	2.825	3.116
СО2, t	11.329	7.234

According to the data of ambient air composition research, the month maximum one-time concentration of oxide sulfur at the border of the protected sanitary area of KhNPP (in Neteshin) was <0.05 mg/m³ (<10.0 % from MAC), the maximum one-time concentration of oxide nitrogen was <0.020 mg/m³ (<10.0 % from MAC) in December.

Total precipitation was 23.0 mm during December. Based on the research of precipitation composition, pH value was 7.0 units.

The average month air temperature was «+2.5°С» (the maximum daily temperature was «+8.7°С», the minimum daily temperature was «-2.7°С»).