Environmental Monitoring and Industrial Control Results

Overview

OF THE RESULTS OF ENVIRONMENTAL AND INDUSTRIAL MONITORING IN 2018

Chayvo Onshore Processing Facility Sakhalin-1 Project

Moscow 2019

TABLE OF CONTENT ABBREVIATIONS ...... 3 1 INTRODUCTION ...... 4 2 RF LEGISLATIVE FRAMEWORK IN THE ENVIRONMENTAL MONITORING AREA ...... 6 2.1 PROTECTION OF ENVIRONMENT ...... 6 2.2 MONITORING OF ATMOSPHERIC AIR ...... 6 2.3 SANITARY-HYGIENIC CONTROL (MONITORING) ...... 7 2.4 GOAL AND OBJECTIVES OF ENVIRONMENTAL MONITORING ...... 7 3 WORK TYPES AND SCOPE ...... 9 4 FIELD AND LABORATORY WORK METHODOLOGY ...... 10 4.1 FIELD WORK METHODOLOGY ...... 10 4.1.1 Groundwater Level Monitoring ...... 10 4.1.2 Groundwater Quality Monitoring ...... 10 4.1.3 Injected wastewater Quality Monitoring ...... 10 4.1.4 Grey Water Monitoring ...... 10 4.1.5 Pollutant Emissions ...... 11 4.1.6 Soil ...... 11 4.1.7 Atmospheric Air and Work Area Air Quality ...... 11 4.1.8 Physical Impact Factors ...... 11 4.1.9 Bezymyanny Creek Monitoring ...... 13 4.2 LABORATORY WORK PROCEDURES ...... 13 5 ENVIRONMENTAL AND INDUSTRIAL MONITORING RESULTS...... 16 5.1 GROUNDWATER LEVEL AND QUALITY IN OBSERVATION WELLS ...... 16 5.1.1 Groundwater Levels ...... 16 5.1.2. Groundwater Quality Monitoring ...... 17 5.2 MONITORING THE QUALITY AND LEVEL OF POTABLE SOURCE GROUNDWATER ...... 18 5.2.1 Monitoring groundwater level at the Chayvo OPF water intake facility ...... 19 5.2.2 Groundwater Quality in the Chayvo OPF Potable Intake Facility...... 22 5.3 POTABLE WATER QUALITY CONTROL ...... 24 5.4 INJECTED WASTEWATER (ASSOCIATED FORMATION WATER AND COMBINED WASTEWATER) ...... 28 5.5 DOMESTIC WASTEWATER ...... 30 5.5.1 Process parameters of wastewater treatment facilities ...... 31 5.6 MONITORING OF HAZARDOUS EMISSIONS FROM STATIONARY SOURCES, MONITORING OF AIR QUALITY IN WORK AND LIVING AREAS ...... 34 5.6.1 Pollutant emissions from stationary sources ...... 35 5.6.2 Air quality monitoring in the work area; ...... 39 5.6.3 Air quality monitoring in the living area ...... 40 5.7 MONITORING AT SANITARY PROTECTION ZONE BOUNDARY ...... 41 5.8 MONITORING AT THE TEMPORARY WASTE STORAGE SITE ...... 42 5.8.1 Monitoring of groundwater level and quality at the temporary waste storage site ...... 43 5.8.2 Monitoring of storm runoff from TWSS ...... 45 5.8.3 Air quality monitoring ...... 46 5.8.4 Topsoil quality monitoring at TWSS ...... 47 5.9 MONITORING OF BEZYMYANNY CREEK ...... 48 5.10 MONITORING OF PHYSICAL FACTORS ...... 49 5.10.1 Monitoring of lighting factors ...... 49 5.10.2 Monitoring of microclimate parameters ...... 50 5.10.3 Vibration level monitoring ...... 59 5.10.4 Monitoring of EMI from PCs in offices ...... 60 5.10.5 Monitoring of parameters of industrial-frequency electromagnetic fields ...... 62 5.10.6 Energy flux density monitoring ...... 63 5.10.7 Thermal radiation intensity monitoring ...... 64 5.10.8 Ionizing radiation monitoring...... 65 List of references……………………………………………………………………………………………………………66 Attachment: List of instruments used for workplace environmental monitoring……………………………………..67 Abbreviations

a.a. – atmospheric air ANO – Autonomous Non-Profit Organization AS – anionic surfactants BOD5 – biological oxygen demand, 5-day BODfull – biological oxygen demand, 20-day TPL – tentative permissible levels GN – Hygienic Standards GOST (R) – State Standard (governance) H – hardness unit PL – pollutant CFU – colony-forming unit LPB – lactose-positive Bacillus coli MM – measurement methodology MU – Guidelines MUK – Guidelines for Control TC – total coliforms TMC – total microbial count MPE – maximum permissible emission MPC – maximum permissible concentration MPCo.t. – maximum permissible concentration, one-time MPL – maximum permissible level PND F – environment protection regulatory documents, federal RD – directive document DN – distribution network CWT – clean water tank SanPiN – Sanitary Codes and Standards SPZ – sanitary-protection zone SP – Sanitary Regulations TTCB – thermotolerant coliform bacteria FSFHI TsGiE – Federal State-Funded Healthcare Institution Sanitary and Epidemiological Center ENL – Exxon Neftegas Limited

3 1 Introduction

This report describes the results of field and laboratory studies conducted in 2018 in accordance with the existing industrial environmental and sanitary-hygienic monitoring program at the Chayvo Onshore Processing Facility (hereinafter, OPF) in 2018. The Chayvo OPF land plot with the total acreage of 382.8 ha is located at the following address: Russia, Sakhalin Oblast, Nogliki Municipal District inter-settlement area, Chayvo Forestry District, sections 123, 124. Cadastral number of the land plot is 65:22:00 00 001:0051. The Chayvo OPF layout diagram is shown in Figure 2.1-1. The Chayvo OPF production area is located in a forest (Chayvo Forest District). The nearest community is the Val settlement, which is located about 20 km to the south of OPF. The Chayvo well site (WS) is about 6 km east of OPF, on the coast of the Sea of Okhotsk. The facility grounds contain technical facilities and access roads.

Figure 2.1-1. Chayvo OPF Location Map

4 The Chayvo OPF is currently used for processing the wellstream from fields to obtain stock oil for export via the De-Kastri Terminal. Dry casing head gas is sent to injection wells at the Chayvo wellsites. Part of the gas is sold to consumers and used as fuel for own purposes. Produced water is sent to disposal wells at the Chayvo OPF site. The Chayvo OPF currently includes a processing facility for treatment of crude oil, natural gas and produced water, auxiliary and storage facilities, and living quarters and offices. Environmental and industrial monitoring is one of the mandatory components of the Sakhalin-1 project implementation. The main objectives of the Environmental and Industrial Monitoring Program are as follows:

 Monitoring and subsequent evaluation of the state of environment components within the potential impact area of the facility during the period of operation as compared to the background conditions or existing regulatory requirements;  Assessment of the effectiveness of environmental protection and sanitary oversight activities;  Obtaining information that allows taking timely measures to ensure safety and health of the company’s employees. The following types of work were performed at Chayvo OPF:

 Monitoring groundwater levels;  Monitoring groundwater quality;  Monitoring of injected effluents quality;  Monitoring of wastewater quality;  Monitoring of atmospheric air quality;  Monitoring of industrial emissions;  Monitoring of temporary waste storage sites;  Industrial monitoring of atmospheric air quality and physical impact factors at the SPZ border;  Monitoring of the Bezymyanny Creek condition;  Monitoring of physical factors;  Monitoring of soil cover.

5 2 RF Legislative Framework in the Environmental Monitoring Area

2.1 Protection of Environment Environmental monitoring requirements are included in the RF laws and regulations, as well as in technical codes/standards issued by federal architecture and urban development authorities, federal agencies in charge of environmental protection, sanitary supervision, civil defense, emergency prevention and response, land resources and land management, protection of subsurface resources, water, atmospheric air, and soil, as well as in the technical codes of other government supervision and oversight authorities, and in the regulations of constituent entities of the Russian Federation. The key regulations related to environmental monitoring in the Russian Federation are set forth in the RF Law #7-FZ “On Environmental Protection” of 10 January 2002 in accordance to the Article 34:

“Siting, design, construction, reconstruction, commissioning, operation, mothballing, and abandonment of buildings, structures, installations, and other facilities that have a direct or indirect negative impact on the environment shall be conducted in compliance with environmental protection requirements. These activities shall include measures for protection of environment, restoration of natural environment, sustainable use and renewal of natural resources, and environmental safety”. The principal objectives of environmental monitoring are as follows:  Assessment of condition of various components of the environment that may be exposed to the man-made impacts from facility operation;  Forecasting potential impacts on ecosystems, and prompt development of measures to monitor environmental conditions and to minimize potential impact.

2.2 Monitoring of Atmospheric Air Federal Law No. 96-FZ “On Atmospheric Air Protection" of May 4, 1999, governs air protection and pollution monitoring. According to Article 25 of this law, “The industrial monitoring of atmospheric air protection shall be the responsibility of legal entities or individual entrepreneurs, which have sources of harmful chemical, biological, and physical impact on the atmospheric air, and which shall appoint persons responsible for industrial monitoring of atmospheric air protection and/or organize environmental protection services”.

6 During the course of monitoring, legal entities shall protect atmospheric air in accordance with the laws of the Russian Federation.

2.3 Sanitary-Hygienic Control (Monitoring) Sanitary-hygienic monitoring is governed by RF Law No. 52-FZ On Sanitary- Epidemiological Welfare of Population in accordance with the Article 11 of which the entities and organization are obliged to:

 Comply with the requirements of the sanitary legislation, the resolutions and directives of the officials in charge of federal government sanitary and epidemiological supervision;  Develop and implement sanitary and epidemic control measures;  Conduct industrial monitoring, including by means of laboratory analyses and tests, over the compliance with sanitary and epidemiological requirements and implementation of disease control (preventive) measures during the performance of work and provision of services, as well as during the production, transportation, storage, and sales of products.

2.4 Goal and Objectives of Environmental Monitoring The goal of environmental monitoring is the oversight over the sources which could potentially have an impact on the environment, the state of geosystems and their components. The following objectives are addressed during monitoring:

 Timely identification of sources which could potentially have an impact on the natural environment during operation;  Assessment of the identified changes in the environment, and forecasting of potential consequences;  Obtaining data on the release of various types of waste into the environment during construction and operation;  Control over emissions and discharges, identification of situations that may cause an impact on the environment in order to take the appropriate environmental protection measures;  Verifying the effectiveness of environmentally sound design solutions and environmental protection measures on the basis of the monitoring results obtained;  Providing information support to the government authorities in charge of monitoring the state of the natural environment; verifying compliance with the regulations,

7 codes/standards and other similar documents requirements applicable to the state on natural sites.

8 3 Work Types and Scope

The types and scope of the work performed in 2018 are described in Table 3-2.4-1. Table 3-2.4-1: Work Types and Scope

Number of Frequency per Work type Monitoring point monitoring PO points Groundwater level measurements Observation wells 005В,006,009,010,007,008 6 Once a month Once in 3 Groundwater quality monitoring Observation wells 005В,006,007,008,009,010 6 months Treatment facilities: Bioresource-200 2 pre- treatment, Grey water studies Yorsh-200 Twice a month 4 post- Bioresource-50 (camp 1140) treatment Bioresource-50 (PLF and AF) Location in module 11 between the holding Formation water quality control tank and the well, or location in integrated 1 Once a month module 29/30 Location in module 11 between the holding 1 Once a month Injected wastewater quality control tank and the well, or location in integrated Once in 3 1 module 29/30 months Instrument-based measurement of Stationary air pollution sources in the Chayvo Once in 3 pollutant emissions into 11 OPF area months atmospheric air Monitoring of air quality in work Incinerator room, PLF office premises, TEG Once in 3 5 spaces regenerators months Monitoring of air quality in living 1 living room Once in 3 Rooms in PLF and camp 1140 spaces per each wing months Monitoring of atmospheric air Once in 3 Temporary waste storage site 2 quality months Monitoring of atmospheric air Once in 3 1000 m from the production site border 1 quality control at the SPZ border months Physical impact factors at the SPZ Once in 3 1000 m from the production site border 1 border months Retention pond at the temporary waste Monitoring of stormwater quality 1 Once a month storage site Lighting, electromagnetic disturbance, noise, Monitoring of physical factors Work places Once a year vibration, non-ionizing radiation Twice a year Microclimate parameters, temperature Monitoring of physical factors Work places (warm and cold radiation periods) Soil cover monitoring Temporary waste storage site 2 Once a year Once a month Bezymyanny Creek monitoring depth, current velocity 1 in ice-free period

9 4 Field and Laboratory Work Methodology

4.1 Field Work Methodology The list of equipment used for industrial environmental monitoring is included in the Attachment hereto.

4.1.1 Groundwater Level Monitoring Groundwater level was measured using EU-100 downhole level gage and measuring tape. The measured groundwater level relative to ground level was adjusted to account for the head elevation. Downhole level measurements were performed in accordance with the Procedural Guidelines of the RF Ministry of Natural Resources for Organizing and Conducting Groundwater Monitoring at Small Group Water Source Facilities and in Individual Development Wells of July 25, 2000. All measurements were taken from the casing or piezometric pipe end with its height above ground surface carefully measured and registered in a level measurement log. Level measurement logs were issued on a monthly basis.

4.1.2 Groundwater Quality Monitoring In addition to groundwater level measurement, groundwater quality studies were performed during the reporting period. Samples were taken with a fluoroplastic sampler PE-1105. Samples were taken, stored, and preserved in compliance with GOST 31861-2012 Water. General Sampling Requirements.

4.1.3 Injected wastewater Quality Monitoring Samples of produced formation water and mixed effluents were taken in compliance with GOST 31861-2012 Water. General Sampling Requirements.

4.1.4 Grey Water Monitoring Samples of grey water were taken before and after the treatment. Water sampling was conducted in accordance with the general sample collection and storage requirements of GOST 31861-2012 Water. General Sampling Requirements, and GOST 31942-2012 Water. Sampling for Microbial Analysis.

10 4.1.5 Pollutant Emissions Measurements were taken in compliance with М-MVI-172-06 Methods of Mass Pollutant Concentration Measurements and Detection of Mass Pollutant Emissions in Effluent Gas of Fuel-Firing Units using MONOLIT Gas Analyzer, М-MVI-171-06 Guidelines for Analytical Control of Pollutant Emissions into the Atmosphere, instructions to gas monitoring stations and posts, Issue 3, part 1, PND F 13.1.16-98.

4.1.6 Soil Soil samples were taken in accordance with GOST 17.4.4.02-84. Soil. Methods of Sample Collection and Preparation for Chemical, Bacteriological, and Helminthological Analysis. Point samples were taken by envelope method, using diagonal pattern, so that each sample represented the portion of soil typical for the genetic horizons. The integrated sample was prepared of five samples taken in layers, weighing up to 0.2 kg.

4.1.7 Atmospheric Air and Work Area Air Quality Measurements were taken in compliance with RD 52.04.186-89 Atmosphere Pollution Control Guidelines, MVI 4215-002-565914009-2009 Methods of Mass Pollutant Concentration Measurement in Atmospheric Air Using GANK-4 Gas Analyzer.

4.1.8 Physical Impact Factors Noise measurements were performed in accordance with SN 2.2.4/2.1.8.562-96 Noise in Workplaces, Residential and Public Buildings, and Residential Development Areas, and with MUK 4.3.2194-07 Guidelines: Noise Level Control in Urban Development Areas, Residential and Public Buildings and Premises. Vibration level were measured in accordance with MU 3911-85 Guidelines for Measurement and Hygienic Assessment of Vibrations, SN 2.2.4/2.1.8.566-96 Industrial Vibration, Vibration in Residential Buildings and Public Premises, GOST 31319-2006 Vibration. Measuring General Vibration and Related Human Exposure. Requirements for Workplace Measurements, GOST 12.1.012-2004 SSBT Vibration Safety. General Requirements, GOST 12.1.049-86 SSBT Vibration. Workplace Measurements at Mechanical Wheeled Road-Building Machines, GOST 31191-2004 Vibration and Blow. General Vibration Measurement and Human Exposure Assessment. Part 2. In-Building Vibration, Instruction R. 2.2.2006-05, approved by Chief State Sanitary Physician of the Russian Federation on July 29, 2005.

11 Regulatory and technical documents governing microclimate measurements performed: SanPiN 2.2.4.548-96 Hygienic Requirements to Microclimate in Production Facilities, GOST 30494-2011 Residential and Public Buildings. Microclimate Parameters in Premises, SanPiN 2.1.2.2645-10 Sanitary-Epidemiological Requirements for Housing Conditions in Residential Buildings and Premises, MUK 4.3.2756-10.4.3. Control Methods. Physical Factors. Guidelines for Measurement and Assessment of Microclimate in Production Premises. Guidelines. Ionizing radiation was measured in compliance with SanPiN 2.6.1.2523-09 Radiation Safety Standards (NRB-99/2009), MU 2.6.1.715-98 Radiation-Hygienic Inspection of Residential and Public Buildings, MDK 13.6(001)-12 In-Building Gamma-Radiation Control Methods, SanPiN 2.1.2.2645-10 Public Health Requirements for Living Conditions in Residential and Public Buildings, MKS-01SА1М dosimeter-radiometer operation manual. Non-ionizing radiation was measured in compliance with SanPiN 2.2.4.3359-16 Public Health Requirements for Physical Factors in the Workplace, SanPiN 2.1.8/2.2.4.1190-03 Hygienic Requirements for Deployment and Operation of Onshore Mobile Radio Communication Aids, SanPiN 2.2.4.1329-03 Requirements for Personnel Protection against Pulse Electromagnetic Noise Exposure, SanPiN 2.1.8/2.2.4.1383-03 Hygienic Requirements for Deployment and Operation of Transmitting Radiotechnical Facilities; GOST 12.1.006-84 SSBT Electromagnetic Fields of Radio Frequencies. Permissible Workplace Levels and Control Requirements, MUK 4.3.1676 Hygienic Assessment of Electromagnetic Noise Generated by Onshore Mobile Radio Stations, MUK 4.3.677-97 Defining Workplace Electromagnetic Field Levels at Radio Enterprises Operating in LF, MF, and HF Ranges, MUK 4.3.678-97 Defining the Level of Intensity Induced by Electromagnetic Fields on Building and Premises Elements within Powerful Radio Emission Source Exposure Areas, MUK 4.3.679-97 Defining the Magnetic Field Level at Location Sites of Radio Broadcasting Transfer and Communication Stations Operating in Kilo-, Hecto- and Decametric Wave Ranges, GN 2.1.8/2.2.4.2262-07 Maximum Permissible Levels of 50 Hz Magnetic Fields in Indoor Premises of Residential and Public Buildings and in Residential Areas, GOST 12.1.002-84 SSBT Industrial-Frequency Electrical Fields. Permissible Levels of Field Strength and Workplace Monitoring Requirements, MUK 4.3.2491-09 Occupational Health Assessment of Industrial- Frequency (50 Hz) Electrical Fields in Production Operation Environments, Instruction R. 2.2.2006-05, approved by approved by Chief State Sanitary Physician of the Russian Federation on July 29, 2005.

12 Lighting was measured in compliance with the following regulatory and technical documents: GOST R 54944-2012 National Standard of the Russian Federation – Buildings and Structures. Lighting Measurement Methods (approved and put in force by Rosstandard Decree # 205-st of July 30, 2012), Guidelines MU OT RM 01-98 / MU 2.2.4.706-98 Work Place Lighting, SP 52.13330.2016 Regulations. Natural and Artificial Lighting. Updated Version of SNiP 23- 05-95, SanPiN 2.2.1/2.1.1.1278-03 Hygienic Requirements to Natural, Artificial and Combined Lighting of Residential and Public Buildings, Instruction R. 2.2.2006-05, approved by Chief State Sanitary Physician of the Russian Federation on July 29, 2005.

4.1.9 Bezymyanny Creek Monitoring Bezymyanny Creek monitoring activities comprised as follows:  general hydrographic description of the creek section within the crossing site;  depth measurements at the South and North ends of the water culvert at the Chayvo OPF – Chayvo WS road stream-crossing site;  defining the current velocity in the water culvert at the Chayvo OPF – Chayvo WS road stream-crossing site;  water flow estimate at the stream-crossing site; Surveys and flow velocity measurement activities were performed by ford. Depth was measured using GR-56 hydrologic ruler; flow velocity was measured with ISP-1M flow rate meter. The work was performed in compliance with the requirements: Directions for Hydrometeorological Stations and Posts. Issue 6, part I; Directions for Hydrometeorological Stations and Posts. Issue.2, part II.

4.2 Laboratory Work Procedures All laboratory work was conducted in compliance with the current regulations and based on certified methodologies. Measurement devices used for laboratory research activities have timely passed state calibration and received calibration certificates. Glassware was prepared for the analyses directly in laboratories in compliance with the guidelines for each component studied. The list of the involved contractor laboratories and information on their Certificates of Accreditation is presented in the Table (Table 4.2-1).

13 Table 4.2-1: List of Involved Contractor Laboratories

Target of Types of Environmental Contractor laboratory Certificate of Accreditation Analysis Monitoring #RA.RU 516065 of 2-11-2015. Groundwater Chemical Sakhalin Hydrometeorological Agency No expiration date

Sakhalin Oblast Sanitary and #RA.RU. 21НВ97 of 4-27-2018. Chemical Epidemiological Center, Yuzhno- Sakhalinsk No expiration date

Sakhalin Oblast Sanitary and #RA.RU.510806 of 12-27-2017. Organoleptic Epidemiological Center in Aleksandrovsk- Sakhalinsky, Tym and Nogliki Districts No expiration date Potable water Sakhalin Oblast Sanitary and #RA.RU.510806 of 12-27-2017. Microbiological Epidemiological Center in Aleksandrovsk- Sakhalinsky, Tym and Nogliki Districts No expiration date

Sakhalin Oblast Sanitary and #RA.RU. 21НВ97 of 4-27-2018. Virology Epidemiological Center, Yuzhno- Sakhalinsk Testing Laboratory Centrer No expiration date

Sakhalin Oblast Sanitary and #RA.RU.510806 of 12-27-2017. Microbiological Epidemiological Center in Aleksandrovsk- Sakhalinsky, Tym and Nogliki Districts No expiration date

Sakhalin Oblast Sanitary and #RA.RU.510806 of 12-27-2017. Parasitological Epidemiological Center in Aleksandrovsk- No expiration date Domestic wastewater Sakhalinsky, Tym and Nogliki Districts Far East Center of Laboratory Analysis #RA.RU.21НВ05 of 2-20-2018. and Technical Metrology, Sakhalin Branch No expiration date Chemical #RA.RU 516065 of 2-11-2015. Sakhalin Hydrometeorological Agency No expiration date #RA.RU 516065 of 2-11-2015. Chemical Sakhalin Hydrometeorological Agency No expiration date

Sakhalin Oblast Sanitary and #RA.RU.510806 of 12-27-2017. Wastewater (runoff, Microbiological Epidemiological Center in Aleksandrovsk- process) Sakhalinsky, Tym and Nogliki Districts No expiration date

Sakhalin Oblast Sanitary and #RA.RU.510806 of 12-27-2017. Parasitological Epidemiological Center in Aleksandrovsk- Sakhalinsky, Tym and Nogliki Districts No expiration date

Associated formation #RA.RU 516065 of 2-11-2015. Chemical Sakhalin Hydrometeorological Agency water and mixed No expiration date wastewater (produced water, process and rainfall runoff, utility Microbiological Analytica Research Center #ИЛ 023-15 wastewater) #RA.RU 516065 of 2-11-2015. Atmospheric air Chemical Sakhalin Hydrometeorological Agency No expiration date #RA.RU 516065 of 2-11-2015. Work zone air Chemical Sakhalin Hydrometeorological Agency No expiration date Industrial pollutant #RA.RU 516065 of 2-11-2015. Chemical Sakhalin Hydrometeorological Agency emissions No expiration date Measurements of electromagnetic field of #RA.RU 516065 of 2-11-2015. industrial frequency, Physical Sakhalin Hydrometeorological Agency No expiration date and of non-continuous noise at SPZ

14 Target of Types of Environmental Contractor laboratory Certificate of Accreditation Analysis Monitoring Microclimate parameters #RA.RU 518238 of 5-8-2015. Lighting, Physical Sakhalin Expert Center electromagnetic field, No expiration date ionizing radiation, noise, vibration measurements #RA.RU 516065 of 2-11-2015. Chemical Sakhalin Hydrometeorological Agency No expiration date Topsoil Microbiological Sakhalin Oblast Sanitary and #RA.RU. 21НВ97 of 4-27-2018. , Epidemiological Center, Yuzhno- Parasitological Sakhalinsk No expiration date

15 5 Environmental and Industrial Monitoring Results

5.1 Groundwater level and quality in observation wells The main groundwater monitoring objectives are as follows:  Monitoring of groundwater levels and quality;  Timely identification of groundwater quality changes to take the measures required to prevent any potential impact on water quality.

5.1.1 Groundwater Levels The groundwater level was determined based on its depth below ground level. Observations were held at Chayvo OPF monthly in 4 wells (005В, 006, 009, and 010) using EU-100 electric level gage. Each measurement in observation wells was registered in level measurement logs. Coordinates and observation well locations are presented in Table 5.1-1. Results of groundwater level measurements in wells are shown in graphic (Figure 5.1- 2).

Table 5.1-1: Coordinates and location of observation wells

Well location and number Coordinates 005В N 52°30’21.0” Near the leach fields of Bioresurs-50/2 treatment station E 143°10’10.0” 006 N 52°30’36.6” Near the leach fields of Bioresurs-200, Yorsh-200 treatment stations E 143°10’38.9” 009 N 52°30’39.6” Easten boundary of the Chayvo OPF E 143°11’25.5” 010 N 52°30’39.5” Western boundary of the Chayvo OPF E 143°10’04.9”

Depth Depth from the groundlevel, cm cm l,

Figure 5.1-1: Groundwater Occurrence Depth Variation Chart The depth of groundwater below the ground level measured in Chayvo OPF observation wells varied over the entire observation period. Variations of groundwater depth at the Chayvo OPF site did not exceed the range of natural seasonal variations during the entire observation period.

5.1.2. Groundwater Quality Monitoring Chemical parameters of groundwater quality were monitored quarterly in the same wells where groundwater levels were measured. Sampling was performed after well flushing and water level recovery. In compliance with GOST 17.1.5.04-81, water samples were poured into storage containers immediately after extraction. The containers were pre-washed with distilled water, followed by willing with target groundwater. Laboratories involved and measurement/test procedures used are listed in Table .

Table 5.1-2: Groundwater quality monitored parameters and measuring methods in observation wells

Measurement Item List of measured parameters Measurement unit Contractor laboratory methodology 1 Ammoniacal load mg/dm³ RD 52.24.383-2005 2 Synthetic surfactants mg/dm³ ANO Sakhalin RD 52.24.368-2006 Meteoagency PNDF 14.1:2:3:4.123-97 3 BOD5 mg/dm³ (2004)

17 Measurement Item List of measured parameters Measurement unit Contractor laboratory methodology PNDF 14.1:2:4. 254-09 4 Suspended solids mg/dm³ (2012) 5 pH рН unit RD 52.24.495-2005 6 Xylene mg/dm³ RD 52.24.479-2008 7 Petroleum products mg/dm³ PNDF 14.1:2:4.168-2000 8 Nitrates РД 52.24.380-2006 9 Nitrites mg/dm³ РД 52.24.381-2006 10 Toluene mg/dm³ РД 52.24.473-2012 11 Specific electric conductivity μS/cm RD 52.24.495-2005 12 Phenols mg/dm³ PNDF 14.1:2:4.182-02 PNDF 14.1:2:4.84-96 13 Formaldehyde mg/dm³ (2013) 14 Phosphates mg/dm³ RD 52.24.382-2006 15 COD mgO/l PNDF 14.1:2.100-97(2004)

Measured рН values (5.5 to 8.3) are generally common for natural waters. Groundwater conductivity readings were in the range of 34.0 – 828.0 μS/cm.

5.2 Monitoring the quality and level of potable source groundwater Water is supplied to Chayvo OPF from water wells №048 and №049 (Fig. 5.2-1), equipped in accordance with the existing sanitary and technical regulations and fitted with water level and rate measurement devices. The main groundwater monitoring objectives are as follows:  Monitoring of the levels and water quality;  Timely identification of groundwater quality changes to take the measures required to prevent any potential impact on water quality.

18 Water intake site

Figure 5.2-1: The situation plan of the Chayvo OPF water intake facility 5.2.1 Monitoring groundwater level at the Chayvo OPF water intake facility Each groundwater level measurement in water wells was recorded in the level measurement log. Resulting measurements are shown in figures 5.2-2 and 5.2-3.

Depthof occurrence, m

Static Dynamic Linear (Static) Linear (Dynamic)

Figure 5.2-2: Trend graph for static and dynamic levels in Well №048 of the Chayvo OPF water intake facility

Depthof occurrence, m

Static Dynamic Linear (Static) Linear (Dynamic)

Figure 5.2-3: Static and dynamic levels in Well №049 of the water sourcing facility at Chayvo OPF

The graphical data show that the water intake facility operates normally. The groundwater level variation in Well 48 did not exceed, on average, 1.63 m, while in Well 49 – 2.74 m.

5.2.2 Groundwater Quality in the Chayvo OPF Potable Intake Facility The potable water supply system at the Chayvo OPF includes:  Two feed pumps supplying water to treatment plant;  Water treatment plant;  Potable water disinfection plant;  Potable water tank;  Heater;  Two pumps. Prior to entry into distribution network, all potable water feeds through the water treatment system. After treatment plant, the water is directed to the potable water tank. The water treatment system throughput capacity is 10 m³/hr (there are two systems, the main and the back-up, each of 10 m³/hr capacity). Water treatment line includes activated carbon filters. Upstream of the activated carbon filters are the filters for extraction of minerals and solids. The water disinfection unit (for neutralization of bacteria) is installed in the pump line of minimal re-circulation. When passing this unit, potable water is brought up to standards per SanPiN 2.1.4.1074–01. Potable water samples were taken from wells №048 and №049 for the following tests:

 chemical, microbiologic, organoleptic indicators – once a month;  organic matter – once a quarter; Laboratories and measurement/test procedures used are listed in Table 5.2-1.

Table 5.2-1: Monitored parameters and procedures for measuring the quality of the groundwater used for water intake

Item List of monitored parameters Unit of measure Contract laboratory Measurement procedure No. 1 Hydrogen index mg/dm³ Sakhalin Oblast Hygiene PND F 14.1:2:3:4.121-97 2 Ammonia (by nitrogen) mg/dm³ and Epidemiology GOST 4192-82 Center - Test Laboratory 3 Total hardness °H Center, Yuzhno- GOST 52407-2005 4 Solids mg/dm³ Sakhalinsk GOST 18164-72

Item List of monitored parameters Unit of measure Contract laboratory Measurement procedure No. 5 Total iron mg/dm³ GOST 4011-72 6 Aluminum mg/dm³ GOST 18165-89 7 Polyphosphates mg/dm³ GOST 18309-72

8 Nitrites (NO2) mg/dm³

9 Nitrates (NO3) mg/dm³ 10 Chlorides mg/dm³ PND F 14.1:2:4.157-99 11 Sulfates µS/cm 12 Fluoride mg/dm³ 13 Calcium mg/dm³ 14 Magnesium mg/dm³ 15 Sodium mgО/L 16 Lithium mg/dm³ PND F 14.1:2:4.167-2000 17 Potassium mg/dm³ 18 Strontium mg/dm³ 19 Barium mg/dm³ 20 Phenols mg/dm³ PND F 14.1:2:4.182-02 21 Total petroleum products mg/dm³ PND F 14.1:2:4.128-98 22 Anionic surfactants mg/dm³ PND F 14.1:2:4.158-00 23 Boron mg/dm³ PND F 14.1:2:4.36-95

24 Permanganate oxidizability mgО2/L PND F 14.1:2:4.154-99 25 Alkalinity mg/dm³ GOST R 52963-2008 26 Chromium hexavalent mg/dm³ ISO 11083 27 Lead mg/dm³ PND F 14.1.2:4.149-99 28 Cadmium mg/dm³ 29 Copper mg/dm³ 30 Zink mg/dm³ PND F 14.1.2:4.139-98 31 Manganese mg/dm³ 32 Hydrocarbonates mg/dm³ RD 52.24.493-2006 33 Selenium mg/dm³ PND F 14.1.2:4.235-06 34 2.4 D mg/dm³ PND F 14.1:2:4.212-05 35 DDT mg/dm³ PND F 14.1:2:4.204-04 36 HCCH mg/dm³ PND F 14.1:2:4.204-04 37 Benzene mg/dm³ PND F 14.1:2:4.57-96 38 Toluene mg/dm³ 39 Chlorobenzene mg/dm³ RD 52.24.482-2012 40 Ethylbenzene mg/dm³ 41 Xylene mg/dm³ PND F 14.1:2:4.57-96 42 Styrene mg/dm³ 43 Nickel mg/dm³ PND F 14.1.2:4.139-98 44 Mercury mg/dm³ M 01-42-2006 45 Arsenic mg/dm³ PND F 14.1.2:4.223-06 46 Molybdenum mg/dm³ GOST 18308-72 47 Chloroform mg/dm³ RD 52.24.482-2012

Item List of monitored parameters Unit of measure Contract laboratory Measurement procedure No. Sakhalin Oblast Hygiene and Epidemiology microbial cells 48 Legionella Center - Test Laboratory MUK 4.2.2217-07 per 1 L Center, Yuzhno- Sakhalinsk

49 Total microbial count CFU/ml Federally Funded Healthcare Agency 50 Total coliforms CFU/100 ml (FBUZ) Sakhalin Oblast MUK 4.2.1018-01 Hygiene and 51 Thermotolerant coliforms CFU/100 ml Epidemiology Center 52 Odor 20/60 point offices in the Aleksandrovsk- 53 Taste point Sakhalinskiy, GOST 3351-74 54 Turbidity mg/L Tymovskiy, and Nogliki districts. 55 Color degree GOST R 52679-07 All microbiological parameters in all of the 2018 water samples from water source wells 048 and 049 meet sanitary and hygiene requirements. Excessive total iron content was observed in most of the samples from wells 048 and 049. The maximum levels of excessive iron content were observed in the January samples from well 48 and February samples from well 49. Excessive content of manganese was observed in the May, June, July, August, and September samples, as well as in the November samples from well 48. In terms of chemical parameters, potable water samples generally conform to the code requirements of SanPiN 2.1.4.1074-01 and GN 2.1.5.1315-03. Prior to delivery to consumers, potable water is treated to the required standards.

5.3 Potable water quality control Potable water quality control was performed at the following points:

 Before entry into the distribution network  Distribution network of Accommodation/Security Complex (ASC)  Distribution network of the food service unit of Permanent Living Facility (PLF)  Distribution network of administrative building  Distribution network of Camp 1140

Before entry into the distribution network

Prior to entering the distribution network downstream of the water treatment system, potable water samples were collected for microbiological and organoleptic analysis every ten days, and for chemical analysis - every quarter. Data on the results of the laboratory chemical analyses of potable water samples are provided in Table 5.31. Data on the results of the laboratory microbiological and chemical analyses of potable water samples are provided in Table 5.32.

Distribution network of Accommodation/Security Complex (ASC)

Potable water samples for microbiological and organoleptic analyses were collected from the water faucets in the dormitory and food service unit twice a month.

Distribution network of administrative building

Potable water samples for microbiological and organoleptic analyses were collected from the water faucets in the administrative building twice a month.

Distribution network of Camp 1140

Potable water samples for microbiological and organoleptic analyses were collected from the water faucets of the distribution network of in the food service unit and Camp 1140 dormitory twice a month.

Table 5.3-1: Results of potable water chemical analyses upstream of the distribution network

Module 16 Monitored parameters MPC* 01/18/18 04/02/18 07/04/18 10/01/18 Hydrogen index (pH) 6-9 6.8 6.9 6.7 6.7 Ammonia (by nitrogen) (mg/dm³) 2.0 - - <0.078 - Total hardness (°H) 7 0.5 0.8 0.5 0.65 Solids (mg/dm³) 1000 46 50 81 47 Phenols (mg/dm³) 0.001 ˂0.0005 ˂0.0005 <0.0005 <0.0005 Total petroleum products (mg/dm³) 0.1 ˂0.005 ˂0.005 <0.005 <0.005 Anionic surfactants (mg/dm³) 0.5 ˂0.025 ˂0.025 <0.025 <0.025 Boron (mg/dm³) 0.5 - - <0.05 -

Permanganate oxidizability (mgО2/liter) 5 0.51 0.43 0.76 0.36 * SanPiN 2.1.4.1074-01 Potable Water. Hygiene Requirements for Water Quality in Centralized Potable Water Supply Systems. Quality Control. Hygiene Requirements for Hot Water Supply System Safety, SanPiN 2.6.1.2523-09 Radiation Safety Standards

Table 5.3-2: Results of potable water sample analyses upstream of the distribution network for microbiological and organoleptic indicators (first six months)

Sampling dates and analysis results Hygiene standar Monitored January February March ds and parameters 09 15 22 29 05 12 19 26 05 12 16 19 26 require ments* Microbiological analyses Total microbial ˂1 ˂1 0 ˂1 ˂1 ˂1 ˂1 ˂1 ˂1 ˂1 ˂1 ˂1 ˂1 <50 count (CFU/ml) Total Not N/ N/ coliforms N/D N/D N/D N/D N/D N/D N/D N/D N/D N/D N/D accepta D D (CFU/100 ml) ble Thermotolera Not N/ N/ nt coliforms N/D N/D N/D N/D N/D N/D N/D N/D N/D N/D N/D accepta D D (CFU/100 ml) ble Organoleptic analyses Odor 20/60 1/1 1/1 2/2 0/0 1/1 1/1 1/1 0/0 0/0 1/1 1/1 2/2 0/0 2 (point score) Taste (point 1 1 2 0 1 1 1 0 0 1 1 2 0 2 score) Turbidity ˂1. ˂1. ˂1. ˂1. ˂1.0 ˂1.0 ˂1.0 ˂1.0 ˂1.0 ˂1.0 ˂1.0 ˂1.0 ˂1.0 2.6 (mg/L) 0 0 0 0 Color ˂5. ˂5. ˂5. ˂5. 14.5 ˂5.0 ˂5.0 ˂5.0 ˂5.0 ˂5.0 ˂5.0 ˂5.0 ˂5.0 20 (degrees) 0 0 0 0 N/D = not detected * SanPiN 2.1.4.1074-01 Potable Water. Hygiene Requirements for Water Quality in Centralized Potable Water Supply Systems. Quality Control. Hygiene Requirements for Hot Water Supply System Safety.

Table 5.3-2: (continued): Results of potable water sample analyses upstream of the distribution network for microbiological and organoleptic indicators (first six months)

Sampling dates and analysis results Hygiene standard Monitored April May June s and parameters requirem 02 09 16 23 07 14 21 28 04 13 18 25 ents*

Microbiological analyses Total microbial ˂1 ˂1 ˂1 ˂1 ˂1 ˂1 ˂1 ˂1 ˂1 ˂1 ˂1 ˂1 <50 count (CFU/ml) Total Not coliforms N/D N/D N/D N/D N/D N/D N/D N/D N/D N/D N/D N/D acceptab (CFU/100 ml) le Thermotolera Not nt coliforms N/D N/D N/D N/D N/D N/D N/D N/D N/D N/D N/D N/D acceptab (CFU/100 ml) le Organoleptic analyses Odor 20/60 1/1 1/1 2/2 2/2 1/1 1/1 1/1 0/0 1/1 1/1 1/1 2/2 2 (point score)

Taste (point 1 1 2 2 1 1 1 0 1 1 1 2 2 score) Turbidity ˂1.0 ˂1.0 ˂1.0 ˂1.0 ˂1.0 ˂1.0 ˂1.0 ˂1.0 ˂1.0 ˂1.0 ˂1.0 ˂1.0 2.6 (mg/L) Color ˂5.0 ˂5.0 5.3 5.3 5.3 5.0 ˂5.0 ˂5.0 5.3 ˂5.0 5.0 5.5 20 (degrees) N/D = not detected * SanPiN 2.1.4.1074-01 Potable Water. Hygiene Requirements for Water Quality in Centralized Potable Water Supply Systems. Quality Control. Hygiene Requirements for Hot Water Supply System Safety.

Table 5.3-2 (continued): Results of potable water sample analyses upstream of the distribution network for microbiological and organoleptic indicators (second six months)

Sampling dates and analysis results Hygiene standards Monitored July August September and parameters 23 30 02 09 16 06 13 20 27 03 10 17 24 requirements * Microbiological analyses Total microbial ˂1 ˂1 ˂1 ˂1 ˂1 ˂1 ˂1 ˂1 ˂1 ˂1 0 ˂1 0 <50 count (CFU/ml) Total coliforms Not N/D N/D N/D N/D N/D N/D N/D N/D N/D N/D N/D N/D N/D (CFU/100 ml) acceptable Thermotolerant Not coliforms N/D N/D N/D N/D N/D N/D N/D N/D N/D N/D N/D N/D N/D acceptable (CFU/100 ml) Organoleptic analyses Odor 20/60 1/1 1/1 0/0 1/1 0/0 0/0 2/2 2/2 1/1 1/1 2/2 0/0 0/0 2 (point score) Taste (point 1 1 0 1 0 0 2 2 1 1 2 0 0 2 score) Turbidity <1.0 <1.0 <1.0 <1.0 <1.0 ˂1.0 ˂1.0 ˂1.0 ˂1.0 ˂1.0 ˂1.0 ˂1.0 ˂1.0 2.6 (mg/L) Color ˂5.0 ˂5.0 5.9 6.5 5.8 5.1 5.0 5.2 6.2 ˂5.0 6.2 5.4 6.5 20 (degrees) N/D = not detected * SanPiN 2.1.4.1074-01 Potable Water. Hygiene Requirements for Water Quality in Centralized Potable Water Supply Systems. Quality Control. Hygiene Requirements for Hot Water Supply System Safety.

Table 5.3-2 (continued): Results of potable water sample analyses upstream of the distribution network for microbiological and organoleptic indicators (second six months)

Sampling dates and analysis results Hygiene Monitored standards and October November December parameters requirements* 01 08 15 22 29 06 12 19 26 03 10 17 24 Microbiological analyses Total microbial 0 0 0 <1 0 0 0 0 0 0 0 0 0 <50 count (CFU/ml) Total coliforms Not N/D N/D N/D N/D N/D N/D N/D N/D N/D N/D N/D N/D N/D (CFU/100 ml) acceptable Thermotolerant Not coliforms N/D N/D N/D N/D N/D N/D N/D N/D N/D N/D N/D N/D N/D acceptable (CFU/100 ml)

Organoleptic analyses Odor 20/60 0/0 0/0 1/1 0/0 2/2 1/1 0/0 0/0 0/0 0/0 1/1 0/0 0/0 2 (point score) Taste (point 0 0 1 0 2 1 0 0 0 0 1 0 0 2 score) Turbidity <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 2.6 (mg/L) Color (degrees) 7.3 7.1 7.3 8.8 8.0 8.6 7.0 7.6 8.1 7.7 8.3 8.6 7.3 20 N/D = not detected * SanPiN 2.1.4.1074-01 Potable Water. Hygiene Requirements for Water Quality in Centralized Potable Water Supply Systems. Quality Control. Hygiene Requirements for Hot Water Supply System Safety.

All potable water samples collected for organoleptic, microbiological, and general analyses downstream of the water treatment system and upstream of the distribution network inlet were in conformance with the code requirements of SanPiN 2.1.4.1074-01 and GN 2.1.5.1315-03. At all points of sample collection from the distribution networks of Camp 1140, Accommodation/Security Complex, and administrative building, the microbiological and organoleptic parameters of potable water samples were in conformance with the code requirements of SanPiN 2.1.4.1074-01.

5.4 Injected wastewater (associated formation water and combined wastewater) The existing industrial wastewater and storm drain (open drain) system comprises above-ground and underground gravity-flow pipes designed to collect storm runoff, washdown water, wastewater from equipment, wastewater from washing floors, and firewater from diked process areas. The wastewater goes to a retention pit, where it is treated by settling, then transferred into the existing produced water tank and from there pumped by disposal water pumps and water injection pumps into disposal wells. The laboratories involved and measurement procedures used during the studies are listed in Table 5.41.

Table 5.4-1: Monitored parameters and procedures used to measure the chemical composition of injected wastewater

Item List of monitored parameters Unit of measure Contract laboratory Measurement procedure No. 1 Density g/cm³ GOST 18995.1-73, Item 2 Autonomous Non- 2 Hydrogen index pH PNDF 14.1:2:3:4.121-97 Profit Organization 3 Free chlorine mg/dm³ PNDF 14.1:2.113-97 (ANO) Sakhalin 4 Hydrogen sulfide mg/dm³ RD 52.24.450-2010

Item List of monitored parameters Unit of measure Contract laboratory Measurement procedure No. 5 Suspended solids mg/dm³ Hydrometeorology PNDF 14.1:2:4.254-09 6 БПК5 mgO2/L Agency PNDF 14.1:2:3:4.123-97 7 Petroleum products mg/dm³ PNDF 14.1:2:4.128-98 8 COD mgО/L PNDF 14.1:2:4.100-97 PNDF 14.1:2:4.50-96 9 Total iron (gross) mg/dm³ RD 52.24.358-2006 PNDF 14.1:2:4.50-96 10 Dissolved iron mg/dm³ RD 52.24.358-2006 11 Alpha particle activity Bq/L GP VNIIFTRI 12 Beta particle activity Bq/L GP VNIIFTRI 13 Ammonium ion mg/dm³ PNDF 14.1:2:3.1-95 14 Salinity mg/dm³ PNDF 14.1:2:4.261-10 15 Solids mg/dm³ PNDF 14.1:2:4.261-10 16 Manganese mg/dm³ RD 52.24.377-2008 17 Nitrites mg/dm³ PNDF 14.1:2:4.3-95 18 Nitrates mg/dm³ PNDF 14.1:2:4.4-95 19 Dissolved oxygen mg/dm³ PNDF 14.:2:3.101-97 RD 03-00147275-067- Sulfate-reducing bacteria Analitika Research 20 cells/ml 2001 (SRB) Center LLC RD 153-39.2-409-2005

Content of monitored components in the samples collected in 2018 fluctuated significantly:

 Hydrogen sulfide – from detection threshold (0.002 mg/dm³) in November to 990.0 mg/dm³ in March;  Suspended solids – from 3.2 mg/dm³ in June to 128.0 mg/dm³ в in September;

 BOD5 – 153.0 mgО2/dm³ in February to 643.0 mgО2/dm³ in April;  Petroleum products – from 23 mg/dm³ in February to 941.0 mg/dm³ in October;

 COD – from 1062.0 mgО2/dm³ in January to 4186.0 mgО2/dm³ in May;  Total iron – from 0.09 mg/dm³ in March to 2.9 mg/dm³ in September;  Alpha particle activity – from below the detection threshold (under 0.01 Bq/dm³) in February to 3.2 Bq/dm³ in September;  Beta activity – from 0.26 Bq/dm³ in May to 3.2 Bq/dm³ in February. Free chlorine content in the samples was below the detection threshold (<0.05 mg/dm³). According to the process flow diagram, the produced water separated from the wellstream at the Chayvo OPF is disposed of in special wells together with treated industrial wastewater without any adverse impact on surface ecosystems (soils, surface water, and groundwater).

5.5 Domestic wastewater In 2018, wastewater samples were collected on a monthly basis at the Chayvo OPF treatment facilities for microbiological, chemical, and parasite analyses. Sampling points at all treatment facilities:

 incoming wastewater – after passing through coarse particle filters;  treated wastewater – at the disinfection unit (UV sterilizer) outlet. The objectives of domestic wastewater monitoring include quality control of treatment facility operations and verification of conformity of treatment efficiency with datasheet ratings. The laboratories involved and measurement procedures used during the studies are listed in Table 5.51.

Table 5.5-1: Monitored parameters and measurement procedures

Item List of monitored Unit of Contract laboratory Measurement procedure No. parameters measure 1 Suspended solids mg/dm³ PND F 14.1:2:4.254-09 2 Ammonia nitrogen mg/dm³ PND F 14.1:2:3.1-95 3 Nitrate nitrogen mg/dm³ PND F 14.1:2:4.4-95 4 Nitrite nitrogen mg/dm³ PND F 14.1:2:4.3-95 5 Phosphates mg/dm³ Sakhalin Oblast branch PND F 14.1:2:4.112-97 office of Federally Funded 6 BODtotal mgO/dm³ PND F 14.1:2:3:4.123-97 Institution - Center for 7 Synthetic surfactant mg/dm³ Laboratory Analysis and PND F 14.1:2.15-95 8 Phenols mg/dm³ Technical Measurements PND F 14.1:2:4.182-02 for the Far Eastern 9 Petroleum products mg/dm³ PND F 14.1:2:4.128-98 Federal District 10 Chlorides mg/dm³ PND F 14.1:2:4.111-97 11 Total iron mg/dm³ Autonomous Non-Profit PND F 14.1:2:4.50-96 12 COD mg/dm³ Organization (ANO) PND F 14.1:2:3.100-97 Sakhalin 13 Zink mg/dm³ Hydrometeorology RD 52.24.377-2008 14 Copper mg/dm³ Agency PND F 14.1:2:4.140-98 15 Lead mg/dm³ PND F 14.1:2:4.140-98 16 Cadmium mg/dm³ PND F 14.1:2:4.140-98 17 Chromium mg/dm³ PND F 14.1:2:4.140-98 18 Arsenic mg/dm³ PND F 14.1:2:4.140-98 19 Total coliforms CFU/100 ml Federally Funded MU 2.1.5.800-99 20 Thermotolerant coliforms CFU/100 ml Healthcare Agency MU 2.1.5.800-99 (FBUZ) Sakhalin Oblast Hygiene and 21 Total microbial count CFU/ml Epidemiology Center MUK 4.2.1018-01 offices in the Aleksandrovsk-

Item List of monitored Unit of Contract laboratory Measurement procedure No. parameters measure Sakhalinskiy, Tymovskiy, and Nogliki districts; Content in 10 Okha District branch office 22 Protozoan cysts MUK 4.2.2661-10 L of Federally Funded Healthcare Agency - Content in 10 23 Helminth egg Sakhalin Oblast Hygiene MUK 4.2.2661-10 L and Epidemiology Center Treatment facilities used at Chayvo OPF

 Biological treatment plants Bioresource-200, and Bioressource-50/1 are designed to treat domestic wastewater coming from Camp 1140. The facilities have a common wastewater receiving tank. Treated wastewater is discharged to leach fields.  Biological treatment plant Bioresource-50/2 is designed to treat domestic wastewater coming from the Accommodation/Security Complex and administrative building. Treated wastewater is discharged to leach fields.

5.5.1 Process parameters of wastewater treatment facilities Table 5.52 lists process parameters (including the design efficiency) of treatment facilities.

Table 5.5-2: Process parameters of treatment facilities used at Chayvo OPF

Process parameters Units of measure Ersh-200 Bioresource-200* Bioresource-50 Capacity m³/day 200-250 200 50 Nominal wastewater flow rate m³/hour 2 8.3 2.1 Characteristics of incoming wastewater Recommended allowable values:

БПК5 mg О2/dm³ 200-450 200-450 375

In terms of BODtotal mg О2/dm³ 286-643.5 286-643.5 536.25 Suspended solids mg/dm³ 400-700 400-700 325 + Ammonium nitrogen (NH4 ) mg/dm³ 50-150 50-150 40 Phosphates mg/dm³ 10 10 16.5 Treatment efficiency:

БПК5 % ≥80-90 ≥90 ≥90 Suspended solids % ≥80-90 ≥90 ≥90 + Ammonium nitrogen (NH4 ) % ≥50 ≥90 ≥90 Synthetic surfactant % ≥50 no data no data Phosphates % ≥50 no data no data * The values shown were based on a similar facility – Bioresource-200 at Odoptu-2 (North) Wellsite

Bioresource-200 treatment facilities

The content of suspended solids in the water at the treatment facility inlet averages 591.3 mg/dm³, which is consistent with the untreated wastewater quality requirements. The content of suspended solids in the treated water averages 16.3 mg/dm³. The average solids removal efficiency is over 97%, which is even better than the treatment unit datasheet efficiency values. The content of suspended solids in the water at the treatment facility inlet averages 65.0 mg/dm³, which is fully consistent with the untreated wastewater quality requirements. Concentrations of ammonium ion in the treated water average 3.0 mg/dm³. Average ammonium ion treatment efficiency is over 95%, which conforms to datasheet values.

The value of BODtotal in the water at the treatment facility inlet averages

313.8 mgO2/dm³, which in general is consistent with the untreated wastewater quality requirements. BODtotal of treated water averaged 2.7 mg О2/dm³.

Average treatment efficiency of Bioresource-200 for BODtotal is over 99%, better than the treatment unit datasheet efficiency values. The phosphate content in the water at the treatment facility inlet averaged 19.3 mg/dm³ over the entire observation period, which exceeds the requirements for untreated water quality (by a factor of ~2). The phosphate content in the treated water averaged 2.5 mg/dm³. Average phosphate treatment efficiency – over 87%. Phenol concentration in treated water varied from the detection threshold (0.0005 mg/dm³) to 0.0092 mg/dm³. Total content of heavy metals in samples after treatment did not exceed 1 mg/dm³. The content of petroleum products in the treated wastewater varied from below the detection threshold (˂0.005 mg/dm³) to 0.077 mg/dm³. Chemical oxygen demand after treatment varied from 37.8 to 310.0 mg/dm³. In general, treatment facilities operate under normal conditions in accordance with the stated datasheet parameters.

Bioresource-50/1 treatment facilities

The content of suspended solids in the water at the Bioresource-50/1 treatment facility inlet averages 591.3 mg/dm³, which is consistent with the untreated wastewater quality requirements. The content of suspended solids in the treated water averages 17.4 mg/dm³.

The average solids removal efficiency is over 97%, which is even better than the treatment unit datasheet efficiency values. The content of ammonium-ion in the water at the treatment facility inlet averages 65.0 mg/dm³, which is fully consistent with the untreated wastewater quality requirements. Concentrations of ammonium ion in the treated water average 7.1 mg/dm³. Average ammonium ion treatment efficiency is over 88%, which virtually conforms to datasheet values.

The value of BODtotal in in the water at the treatment facility inlet averages

313.8 mg O2/dm³, which generally is consistent with the untreated wastewater quality requirements. The value of BODtotal of treated water averaged 2.8 mg О2/dm³.

Average treatment efficiency of Bioresource-50/1 for BODtotal is over 99%, better than the treatment unit datasheet efficiency values. The phosphate content in the water at the treatment facility inlet averaged 19.3 mg/dm³ over the entire observation period. The phosphate content in the treated water averaged 1.2 mg/dm³. Average phosphate treatment efficiency - over 93%. The phenol content in the treated wastewater varied from 0.0006 mg/dm³ to 0.014 mg/dm³. The content of petroleum products in the treated wastewater varied from below the detection threshold (˂0.005 mg/dm³) to 0.013 mg/dm³. During the reporting period, zinc concentrations in the treated wastewater varied from 0.0029 mg/dm³ to 0.13 mg/dm³, and copper - from 0.0006 to 0.022 mg/dm³. Total content of heavy metals in samples after treatment did not exceed 1 mg/dm³. Chemical oxygen demand after treatment varied from 28,1 to 70,7 mg/dm³. The average COD efficiency of the treatment facilities exceeded 90%. Treatment facilities operate under normal conditions in accordance with the stated datasheet parameters.

Bioresource-50/2 treatment facilities of the Accommodation/Security Complex and administration and office building

The content of suspended solids in the water at the inlet of the Bioresource-50/1 treatment facility, PLF, and AOB averages 363.0 mg/dm³, which is consistent with the

untreated wastewater quality requirements. The content of suspended solids in the treated water averages 11.1 mg/dm³. The average solids removal efficiency is over 96%, which is even better than the treatment unit datasheet efficiency values. The content of ammonium-ion in the water at the treatment facility inlet averages 40.4 mg/dm³, which is virtually consistent with the untreated wastewater quality requirements. Concentrations of ammonium ion in the treated water average 3.0 mg/dm³. The average ammonium ion treatment efficiency did not exceed 92%, which was fully consistent with the datasheet of the treatment facilities (≥90%).

The value of BODtotal in the water at the treatment facility inlet averages

238.0 mg O2/dm³, which is fully consistent with the untreated wastewater quality requirements.

BODtotal of treated water averaged 2.8 mg О2/dm³.

Average treatment efficiency of Bioresource-50/2 for BODtotal is over 98%, which is even better than that specified in the treatment unit datasheet efficiency values. The content of phenols in the treated wastewater varied from below the detection threshold (˂0.0005 mg/dm³) to 0,0063 mg/dm³. The content of petroleum products in the treated wastewater varied from below the detection threshold (˂0,005 mg/dm³) to 0,009 mg/dm³. During the reporting period, zinc concentrations in the treated wastewater varied from 0,003 mg/dm³ to 0.26 mg/dm³, and copper - from 0,0016 to 0,025 mg/dm³. Total content of heavy metals in samples after treatment did not exceed 1 mg/dm³. Chemical oxygen demand after treatment varied from 16.6 to 83,0 mg/dm³. The average COD efficiency of the treatment facilities exceeded 88%. Treatment facilities operate under normal conditions in accordance with the stated datasheet parameters.

5.6 Monitoring of hazardous emissions from stationary sources, monitoring of air quality in work and living areas The following measurements were performed in 2018 in accordance with the Program of Environmental Monitoring and Industrial Environmental Oversight at Chayvo OPF:  air quality monitoring in the work area;  air quality monitoring in the living area;

The laboratories involved and measurement procedures (MVI) used during the studies are listed in Table 5.61.

Table 5.6-1: Monitored parameters and measurement procedures for industrial emissions, air in work and living areas

Item List of monitored Unit of Measurement Contract laboratory No. parameters measure procedure Pollutant emissions from stationary sources 1 Nitrogen oxide mg/m³ M-MVI-171-06 2 Nitrogen dioxide mg/m³ 3 Methane mg/m³ KPGU 41 3322002 4 Carbon oxide mg/m³ M-MVI-171-06 Measurement 5 Benz(a)pyrene mg/m³ Procedure No. SPEK- 03-26 Instructions for Autonomous Non-Profit hydrometeorological 6 Atmospheric pressure hPa Organization (ANO) Sakhalin stations and posts. Hydrometeorology Agency Rev. 3, p. 1 7 Gas humidity g/m³ GOST 17.2.4.08-90 Flow pressure 8 hPa (negative) 9 Volumetric flow rate m³/s M-MVI-171-06 10 Gas velocity m/s 11 Ambient air temperature °С 12 Gas temperature °С Living quarters air Autonomous Non-Profit KPGU 41 3322002 PS 1 Formaldehyde mg/m³ Organization (ANO) Sakhalin KPGU 41 3322002 RE Hydrometeorology Agency Workplace air 1 Ethylene glycol mg/m³ М-06-08 2 Triethylene glycol mg/m³ Autonomous Non-Profit 3 Hydrogen sulfide mg/m³ RD 52.04.795-2014 Organization (ANO) Sakhalin 4 Sulfur dioxide mg/m³ RD 52.04.822-2015 Hydrometeorology Agency 5 Hydrocarbons C1–C5 mg/m³ KPGU 41 3322002 PS 6 Hydrocarbons C12–C19 mg/m³ KPGU 41 3322002 RE

5.6.1 Pollutant emissions from stationary sources Environmental oversight over compliance with the established maximum permission emissions (MPE) standards at the ENL facilities was in accordance with RD 52.04.186-89, Air Pollution Monitoring Guidelines. Based on the MPE standards developed for the project and the approved work schedule, standards conformity oversight is conducted in accordance with the contribution of each specific source to air pollution.

At controlled emission sources, sampling is planned to be performed annually or once every 5 years, depending on the “source-pollutant” combination. Within the framework of industrial (internal) oversight, ENL monitors compliance with the established MPE standards on a quarterly basis in order to minimize the potential impact on the environment, to monitor equipment operation and to ensure timely response. In 2018, measurements of pollutant concentrations in the emissions from the following stationary sources were performed at Chayvo OPF:

 Gas injection compressor station (Train A, Module 3);  Gas injection compressor station (Train B, Module 4);  Gas turbine generator (Module 14);  Hot oil heater (A);  Hot oil heater (B);  TEG regenerator А1;  TEG regenerator А2;  TEG regenerator В1;  TEG regenerator В2; The locations of pollutant concentration measuring points are shown in Figure 5.6-1. Measurements were performed in pipe access holes. Mass concentrations of pollutants and physical parameters of gas flow were measured in the exhaust gas stacks. The results of harmful substance emission measurements are described in Table 5.6-2.

Figure 5.6-1: Locations of pollutant emission measuring points

Table 5.6-2: Results of harmful substance mass emissions

No. of Mass emission (g/s) air Date Sampling point pollution of Nitrogen Nitrogen oxide Carbon oxide Benz(a)pyrene Methane source sampling dioxide (APS) 20.10.18 0.6278144 0.1020198 0.1716680 - - Gas injection compressor, Train A (Module 3) 0003 MPE 19.8262137 3.2217597 7.0807906 - - Gas Injection Compressor, Train B 20.10.18 0.8702200 0.1414108 0.0836750 - - 0004 (Module 4) MPE 19.8262137 3.2217597 7.0807906 - - 19.10.18 2.2923264 0.3725030 0 - - Gas turbine unit (turbine generator) 2 (Module 14) 0002 MPE 22.8841258 3.7186705 16.1681324 - - 20.10.18 1.1125096 0.1807828 0 - 0.0100337 Crude Oil Preheater Train A 0007 MPE 1.5358383 0.2495737 0.9219585 - 0.0921958 20.10.18 1.1852880 0.1926093 0 - 0.0051287 Crude Oil Preheater Train B 0008 MPE 1.5358383 0.2495737 0.9219585 - 0.0921958 19.10.18 0.0655032 0.0106443 0.0685110 7.19E-09 - Triethylene glycol regenerator pipe 1. Train A 0005 MPE 0.2056174 0.0334128 0.3607042 3.1270E-08 - 19.10.18 0.0688800 0.0111930 0.0051660 1.46E-09 - Triethylene glycol regenerator pipe 2. Train A 0273 MPE 0.2056174 0.0334128 0.3607042 3.1270E-08 - 19.10.18 0.0459608 0.0074686 0.0141660 2.28E-09 - Triethylene glycol regenerator pipe 1. Train B 0006 MPE 0.2056174 0.0334128 0.3607042 3.1270E-08 - 19.10.18 0.0688864 0.0111940 0.0050160 1.04E-08 - Triethylene glycol regenerator pipe 2. Train B 0274 MPE 0.2056174 0.0334128 0.3607042 3.1270E-08 - 19.10.18 5.1188480 0.8318128 1.6453440 - - Booster compressor gas turbine 0167 MPE 9.1615741 1.4887558 8.3129846 - - 19.10.18 0.3175392 0.0516001 0.0240560 - - Taurus 60 turbine generator 1 0165 MPE 4.3462352 0.7062632 4.1408491 - -

The reporting period measurement results show no MPE exceedance for pollutant emissions. All units were operating in accordance with their datasheet parameters.

5.6.2 Air quality monitoring in the work area; The work area air quality analyses were performed on a quarterly basis in TEG rooms and offices (ASC). The data on the results of work area air quality analyses are provided in Tables 5.6-3– 5.6-4.

Table 5.6-3: Results of work area air quality analyses

single Sampling date Monitored parameters MPC* 02/16/2018 04/16/2018 07/14/2018 10/17/2018 Office 135 Sulfur dioxide (mg/m3) 10 0.008 0.009 0.006 ˂0.0025

С1-С5 7000 ˂25 ˂25 ˂25 ˂25 Hydrocarbons (mg/m³) C12-C19 300 ˂0.1 ˂0.1 ˂0.1 ˂0,1 Hydrogen sulfide (mg/m³) 10 ˂0.006 ˂0.006 ˂0.006 ˂0.006 Office 112 Sulfur dioxide 10 0.003 0.008 0.006 ˂0.0025

С1-С5 7000 ˂25 ˂25 ˂25 ˂25 Hydrocarbons (mg/m³) C12-C19 300 ˂0.1 ˂0.1 ˂0.1 ˂0,1 Hydrogen sulfide (mg/m³) 10 ˂0.006 ˂0.006 ˂0.006 ˂0.006 Office 103 Sulfur dioxide (mg/m3) 10 0.003 0.011 0.006 ˂0.0025

С1-С5 7000 ˂25 ˂25 ˂25 ˂25 Hydrocarbons (mg/m³) C12-C19 300 ˂0.1 ˂0.1 ˂0.1 ˂0,1 Hydrogen sulfide (mg/m³) 10 ˂0.006 ˂0.006 ˂0.006 ˂0.006 Security office 111 Sulfur dioxide (mg/m3) 10 0.003 0.010 0.006 ˂0.0025

С1-С5 7000 ˂25 ˂25 <25 ˂25 Hydrocarbons (mg/m³) C12-C19 300 ˂0.1 ˂0.1 <0.1 ˂0,1 Hydrogen sulfide (mg/m³) 10 ˂0.006 ˂0.006 <0.006 ˂0.006 * - GN 2.2.5.3532-18, Maximum Permissible Concentrations (MPC) of Harmful Substances in Workplace Air.

Table 5.6-4: Results of air quality analyses in the work area of TEG regenerators single Sampling date Monitored parameters MPC* 02/19/2018 04/16/2018 07/16/2018 10/20/2018 TEG regenerator A Ethylene glycol (mg/m³) 10.0 ˂2.5 ˂2.5 ˂2.5 ˂2.5 Triethylene glycol (mg/m³) 10.0 ˂2.5 ˂2.5 ˂2.5 ˂2.5 Nitrogen dioxide (mg/m³) 2.0 0.031 0.045 0.028 0.051 Nitrogen oxide (mg/m³) 5.0 ˂0.028 0.037 ˂0.028 0.030

single Sampling date Monitored parameters MPC* 02/19/2018 04/16/2018 07/16/2018 10/20/2018 Carbon oxide, mg/m³ 20.0 2.6 ˂1.5 ˂1.5 ˂1.5 TEG regenerator В Ethylene glycol (mg/m³) 10.0 ˂2.5 ˂2.5 ˂2.5 ˂2.5 Triethylene glycol (mg/m³) 10.0 ˂2.5 ˂2.5 ˂2.5 ˂2.5 Nitrogen dioxide (mg/m³) 2.0 0.037 0.041 0.022 0.062 Nitrogen oxide (mg/m³) 5.0 ˂0.028 ˂0.028 ˂0.028 0.052 Carbon oxide, mg/m³ 20.0 2.6 ˂1.5 ˂1.5 ˂1.5 * - GN 2.2.5.3532-18, Maximum Permissible Concentrations (MPC) of Harmful Substances in Workplace Air. Air quality in offices and work areas in TEG regenerator rooms conforms to the code requirements for workplace air quality set forth in GN 2.2.5.3532-18, Maximum Permissible Concentrations (MPC) of Harmful Substances in Workplace Air.

5.6.3 Air quality monitoring in the living area The air in the Chayvo OPF living quarters was tested for formaldehyde concentrations. The data on the results of instrument-based analyses are provided in Table 5.6-5.

Table 5.6-5: Results of instrument-based measurements of formaldehyde in the Chayvo OPF living quarters air Measurement results (mg/m³) Sample collection point 10/17, 02/16/2018 04/16/2018 07/14/2018 21.10/2018 ASC living quarters, building wing С-2, room 202 ˂0.005 ˂0,005 ˂0,005 ˂0,005 ASC living quarters, building wing С-1, room 120 ˂0.005 ˂0,005 ˂0,005 ˂0,005 ASC living quarters, building wing D-2, room 202 ˂0.005 ˂0,005 ˂0,005 ˂0,005 ASC living quarters, building wing D-1, room 101 ˂0.005 ˂0,005 ˂0,005 ˂0,005 ASC living quarters, building wing Е-1, room 108 ˂0.005 ˂0,005 ˂0,005 ˂0,005 ASC living quarters, building wing Е-2, room 206 ˂0.005 ˂0,005 ˂0,005 ˂0,005 ASC living quarters, building wing F-1, room 110 ˂0.005 ˂0,005 ˂0,005 ˂0,005 ASC living quarters, building wing F-2, room 206 ˂0.005 ˂0,005 ˂0,005 ˂0,005 Camp 1140 living quarters, building wing А, room А-20 ˂0.005 ˂0,005 ˂0,005 ˂0,005 Camp 1140 living quarters, wing B, room А-28 ˂0.005 ˂0,005 ˂0,005 ˂0,005 Camp 1140 living quarters, wing C, room А-23 ˂0.005 ˂0,005 ˂0,005 ˂0,005 Camp 1140 living quarters, wing D, room А-28 ˂0.005 ˂0,005 ˂0,005 ˂0,005 Camp 1140 living quarters, wing E, room А-9 ˂0.005 ˂0,005 ˂0,005 ˂0,005 MPC* 0.05 * - GN 2.1.6.3492-17, Maximum Permissible Concentrations (MPC) of Pollutants in the Air of Urban and Rural Communities. All of the analyzed living area air samples conform to the code requirements of GN 2.1.6.3492-17, Maximum Permissible Concentrations (MPC) of Pollutants in the Air of Urban and Rural Communities.

5.7 Monitoring at sanitary protection zone boundary Monitoring of atmospheric air pollution was performed on a quarterly basis for the following parameters:

 Nitrogen dioxide;  Nitrogen oxide,  Carbon monoxide,  Hydrogen sulfide

 Hydrocarbons C12–C19 The laboratories and measurement procedures used for the analyses are listed in Table 5.7-1.

Table 5.7-1: Monitored parameters and measurement procedures for atmospheric air at sanitary protection zone boundary

Item List of monitored Unit of Contract laboratory Measurement procedure No. parameters measure Atmospheric air at sanitary protection zone boundary 1 Nitrogen oxide mg/m³ Autonomous Non-Profit 2 Nitrogen dioxide mg/m³ Organization (ANO) RD 52.04.792-2014 3 Hydrogen sulfide mg/m³ Sakhalin 4 Hydrocarbons C12–C19 mg/m³ Hydrometeorology KPGU 41 3322002 PS 5 Carbon oxide mg/m³ Agency KPGU 41 3322002 RE The data on the results of atmospheric air quality analyses are provided in Table 5.7-2.

Table 5.7-2: Results of atmospheric air quality analyses at sanitary protection zone (SPZ) boundary Point 1 on the southwest side, 1000 m away from the industrial Monitored MPC area (federal road towards Nogliki) parameters atm.air**. 02/17/2018 04/18/2018 07/16/2018 10/18/2018 Analyses results Hydrogen sulfide 0.008 ˂0.006 ˂0.006 ˂0.006 -* (mg/m³) Nitrogen dioxide 0.2 0.024 0.024 0.027 0.046 (mg/m³) Nitrogen oxide 0.4 ˂0.028 ˂0.028 ˂0.028 -* (mg/m3) Carbon oxide, 5.0 2.3 ˂1.5 ˂1.5 2.1 mg/m³ Hydrocarbons C12- 1 ˂0.1 ˂0.1 0.3 -* C19 (mg/m³) Air temperature (°C) - -14 5.3 16.7 8.1 Pressure (mmHg) - 752 750.9 758.0 750.0 * – these indicators are not analyzed due to the change in the analysis program. ** - GN 2.1.6.3492-17, Maximum Permissible Concentrations (MPC) of Pollutants in the Air of Urban and Rural Communities.

Setting the standards for actual noise levels and determination of equivalent noise levels was performed based on the maximum permissible level (MPL) for nighttime and daytime (in accordance with a purchase order). The results of actual noise level measurements and determination of equivalent noise levels are described in Table 5.7-3.

Table 5.7-3: Results of noise impact measurements at SPZ boundary Sound level L and equivalent Maximum sound levels L Measurement date A A max sound level LAeq (dBA) (dBa) 02/17/2018 48.4 71.6 04/18/2018 50.0 67.0 07/16/2018 37.3 59.4 10/18/2018 43.2 59.7 MPL* (07:00 a.m. to 11:00 p.m.) 60 75 MPL* (11:00 p.m. to 07:00 a.m.) 50 65 *MPL based on SN 2.2.4/2.1.8.562-96, Noise at Workplaces, in Indoor Areas of Residential and Public Buildings, and in Residential Development Areas The data on the results of non-ionizing electromagnetic radiation measurements are provided in Table 5.7-4.

Table 5.7-4: Results of non-ionizing electromagnetic radiation measurements Measurement results Monitored parameters MPL* 02/17/2018 04/18/2018 07/16/2018 10/18/2018 Electric field strength (EMI) (kV/m) 1 ˂0.01 ˂0.01 ˂0.01 ˂0.01 Magnetic field strength (A/m) 8 ˂0.1 ˂0.1 ˂0.1 ˂0.1 SanPiN 2.1.2.2645-10, Sanitary and Epidemiological Requirements for Living Conditions in Residential Buildings and Indoor Premises All of the air quality parameters monitored at the SPZ monitoring point were fully consistent with the code requirements of GN 2.1.6.3492-17, Maximum Permissible Concentrations of Pollutants in the Air of Urban and Rural Communities, SN 2.2.4/2.1.8.562- 96, Noise at Workplaces, in Indoor Areas of Residential and Public Buildings, and in Residential Development Areas, and SanPiN 2.1.2.2645-10, Sanitary and Epidemiological Requirements for Living Conditions in Residential Buildings and Indoor Premises.

5.8 Monitoring at the temporary waste storage site Measurements were performed to determine the level and quality of groundwater in wells 007 and 008 and storm water in the retention pond, as well as the concentrations of harmful substances in ambient air.

5.8.1 Monitoring of groundwater level and quality at the temporary waste storage site The information on the coordinates and locations of groundwater observation wells near the temporary waste storage site is provided in Table 5.8-1.

Table 5.8-1. Coordinates and locations of groundwater observation wells near the temporary waste storage site

Well number Coordinates Location N 52º30’15.7” 007 East boundary of temporary waste storage site E 143º11’41.2” N 52º30’03.6” 008 South boundary of temporary waste storage site E 143º11’39.2” In 2018, water table levels in Chayvo OPF wells 007 and 008 were measured on a monthly basis. Water table measurement results are shown in Figure 5.8-1.

January February March April May June July August September October November December

Level above gradeLevel (cm) above

Jan 17 Feb 06 Mar 11 Apr 08 May 21 Jun 11 Jul 28 Aug 27 Sep 27 Oct 12 Nov 09 Dec 16

Figure 5.8-1: Chart showing water table variations

Water samples were collected in wells for chemical analysis on a quarterly basis. The data on the results of groundwater analysis are provided in Table 5.8-2. Electrical conductivity of water did not increase by more than 50%.

Table 5.8-2. Results of analysis of the groundwater from observation wells near the temporary waste storage site (TWSS)

Analyses results Well 007 Well 008 Monitored Before After Before After Before After Before After No Before After Before After parameters pumping pumping pumping pumping No pumping pumping pumping pumping pumping pumping pumping pumping on on on on pumping pumping on on on on 03/11/2018 03/11/2018 06/28/2018 07/06/2018 August August October October 06/28/2018 07/06/2018 August August October October 26, 2018 26, 2018 12, 2018 12, 2018 25, 2018 25, 2018 12, 2018 12, 2018 Hydrogen 5.9 6.0 6.1 5.7 5.9 6.6 6.6 6.3 6.4 5.8 6.1 6.5 6.1 6.9 index (pH) Electrical conductivity 17 27.3 25.2 23.0 33 23.9 24.9 25 36 58 38 41 35 39 (µS/cm) Petroleum products ˂0.020 ˂0.020 ˂0.020 ˂0.020 ˂0.020 ˂0.020 ˂0.020 ˂0.020 ˂0.020 0.032 0.041 0.055 ˂0.020 ˂0.020 (mg/dm³) Lead 0.0006 0.0044 0.0015 0.0045 0.0012 ˂0.0002 ˂0.0002 0.0007 0.0104 0.0013 0.00042 0.00022 0.00042 0.00029 (mg/dm³)

5.8.2 Monitoring of storm runoff from TWSS In 2018, the storm runoff water samples were collected from the retention pond at the temporary waste storage site. The samples were collected for microbiological, parasite, and chemical analyses. The laboratories and measurement procedures used for the analyses are listed in Table 5.8-3.

Table 5.8-3: Monitored parameters and procedures used to measure the chemical composition of storm water at TWSS

Item List of monitored Unit of Contract laboratory Measurement procedure No. parameters measure 1 Suspended solids mg/dm³ PNDF 14.1:2:4.254-09

2 BODfull mg/dm³ PNDF 14.1:2:3:4.123-97 3 Ammonia nitrogen mg/dm³ PNDF 14.1:2.1-95 4 Nitrate nitrogen mg/dm³ PNDF 14.1:2.4-95 5 Nitrite nitrogen mg/dm³ PNDF 14.1:2.3-95 Autonomous Non-Profit 6 Total iron mg/dm³ Organization (ANO) Sakhalin RD 52.24.358-2006 Hydrometeorology Agency 7 Chlorides mg/dm³ PND F 14.1:2:4.111-97 8 Anionic surfactants mg/dm³ PNDF 14.1:2.15-95 9 Petroleum products mg/dm³ PNDF 14.1:2:4.128-98 10 Phenols mg/dm³ PNDF 14.1:2:4.182-02 11 Phosphates mg/dm³ PNDF 14.1:2:4.112-97 Okha District branch office of 12 Protozoan cysts in 10 L Federally Funded Healthcare Agency - Sakhalin Oblast MUK 4.2.2661-10 Hygiene and Epidemiology 13 Helminth egg in 10 L Center 14 Total microbial count CFU in100 ml Federally Funded Healthcare MU 2260-80 Agency (FBUZ) Sakhalin Oblast Hygiene and Epidemiology Center offices 15 Total coliforms CFU in100 ml in the Aleksandrovsk- MU 2.1.5.800-99 Sakhalinskiy, Tymovskiy, and Nogliki districts. The results of storm runoff water analyses are presented in Table 5.8-4.

Table 5.8-4: Results of the analyses of storm runoff water from temporary waste storage site Analyses results Monitored parameters 05/23- 07/05- 08/08- 06/11/2018 09/10/2018 10/14/2018 24/2018 06/018 09/2018 Chemical parameters Suspended solids (mg/dm³) 4.4 9.0 0.93 0.61 7.1 1.23 BODtotal (mg/dm³) 1.5 0.96 <0.7 <0.7 <1.43 <0.7 Ammonium nitrogen (mg/dm³) 0.12 0.05 <0.04 <0.04 <0.04 <0.04 Nitrate nitrogen (mg/dm³) ˂0.02 ˂0.02 0.070 0.049 <0.02 0.034 Nitrite nitrogen (mg/dm³) ˂0.006 ˂0.006 <0.006 <0.006 <0.006 <0.006 Total iron (mg/dm³) ˂0.05 ˂0.05 <0.05 0.11 0.13 <0.05 Chlorides (mg/dm³) ˂10 11.4 7.2 16 10.1 <10

Analyses results Monitored parameters 05/23- 07/05- 08/08- 06/11/2018 09/10/2018 10/14/2018 24/2018 06/018 09/2018 Anionic surfactants (mg/dm³) 0.10 0.015 <0.010 <0.010 <0.010 0.018 Petroleum products (mg/dm³) ˂0.005 ˂0.005 <0.005 0.010 0.015 0.008 Phenols (mg/dm³) 0.0011 0.0018 <0.0005 <0.0005 <0.0005 0.0011 Phosphates (mg/dm³) ˂0.05 ˂0.05 <0.05 <0.05 <0.05 <0.05 Parasite data not not Protozoan cysts per 10 L not detected not detected not detected not detected detected detected not not Helminth eggs per 10 L not detected not detected not detected not detected detected detected Microbiological data Total microbial count, 37ºC 8 11 9 5 10 0 (CFU in 100 ml) Total coliforms (CFU in 100 ˂50 ˂50 ˂50 ˂50 ˂50 ˂50 ml) Thermotolerant coliforms ˂50 ˂50 ˂50 ˂50 ˂50 ˂50 (CFU/100 ml) N/D = not detected 5.8.3 Air quality monitoring In 2018, atmospheric air samples were taken on a quarterly basis at the temporary waste storage site at two monitoring points:

 In the central part of the site  At the site boundary The results of the quarterly analysis of the atmospheric air quality at the temporary waste storage site are presented in Table 5.8-5.

Table 5.8-5: Results of atmospheric air quality analyses at the temporary waste storage site Analyses results Monitored MPCat Site center At the site boundary parameters m.air* 02/20 04/17 07/17 10/17 02/20 04/17 07/17 10/17 Nitrogen dioxide 0.2 0.044 0.024 0.024 0.038 0.030 0.027 0.023 0.039 (mg/m³) Nitrogen oxide 0.4 ˂0.028 ˂0.028 <0.028 ˂0.028 ˂0.028 ˂0.028 <0.028 0.28 (mg/m3) Benz(a)pyrene 1.0×10- ˂0.2*10-6 ˂0.2*10-6 <0.2*16-6 ˂0.2х10-6 ˂0.2*10-6 ˂0.2*10-6 <0.2*10-6 <0.2*10-6 (mg/m³) 6 Soot (mg/m³) 0.15 0.035 0.050 <0.030 ˂0.030 ˂0.03 0.067 <0.030 ˂0.030 Hydrogen sulfide 0.008 ˂0.006 ˂0.006 <0.006 ˂0.006 ˂0.006 ˂0.006 <0.006 ˂0.006 (mg/m³) Sulfur dioxide (mg/m3) 0.5 0.003 0.003 0.005 ˂0.0025 0.004 0.003 0.007 ˂0.0025 Inorganic dust (suspended solids) 0.3 0.13 0.35 <0.05 0.15 ˂0.05 0.28 0.27 0.05 (mg/m³) Hydrocarbons 1 ˂0.1 ˂0.1 <0.1 ˂0.1 ˂0.1 ˂0.1 <0.1 ˂0.1 С12-С19 (mg/m³) Carbon oxide, mg/m³ 5 2.5 ˂1.5 <1.5 2.3 1.6 ˂1.5 <1.5 2.0 Formaldehyde 0.050 ˂0.005 ˂0.005 <0.005 ˂0.005 ˂0.005 ˂0.005 <0.005 ˂0.005 (mg/m³) Air temperature (°C) - -18.0 5.6 14.2 7.6 -18.5 5.8 14.7 7.4 Pressure (mm Hg) - 754.2 749.6 757.9 748.8 754.9 749.5 757.8 748.7

* - MPC per regulatory requirements of GN 2.1.6.3492-17, Maximum Permissible Concentrations (MPC) of Pollutants in the Air of Urban and Rural Communities. 5.8.4 Topsoil quality monitoring at TWSS In 2018, topsoil samples were collected at the temporary waste storage site from three depth levels: 0-5 cm, 5-10 cm, and 5-20 cm. The results of the topsoil quality analyses at the temporary waste storage site are presented in Tables 5.8-6 and 5.8-7.

Table 5.8-6: Results of TWSS topsoil chemical analysis Parameter description Depth level 0-5 cm Depth level 5-20 cm MPC/TAC *** Sampling date 08/26/2018 Barium* (mg/kg) 119 84 - Cadmium* (mg/kg) 0.026 0.044 2.0** Copper* (mg/kg) 4.4 4.8 132** Arsenic (mg/kg) 0.32 0.46 10 Mercury (mg/kg) <0.02 0.039 2.1 Lead* (mg/kg) 0.24 0.28 32 Zinc* (mg/kg) 23 21 220** Petroleum products (mg/kg) 0.0071 0.0051 - *- gross content **- GN 2.1.7.2041-06, Maximum Permissible Concentrations (MPCs) of Chemicals in Soil *** - GN 2.1.7.2511-09 Tentatively Allowable Concentrations (TACs) of Chemicals in Soil (with pH KCl<5.5)

Table 5.8-7: Results of microbiological, parasite, and entomological analysis of topsoil at TWSS Depth level Depth level 5- Depth level 5- Parameter description MPC* 0-5 cm 20 cm 10 cm Entomological analyses Fly larvae and pupae (sp. in soil, 20 x - - not detected Not permitted 20 cm area) Microbiological analyses not more than Coliform bacteria index (cells/g) <10 <10 - 10 not more than Enterococcal index (cells/gram) <10 <10 - 10 Parasite analyses Helminth eggs and larvae (sp./kg) not detected - not detected Not permitted N/D = not detected * - SanPiN 2.1.7.1287-03, Sanitary and Epidemiological Requirements for Soil Quality

The water table variations over the entire monitoring period did not exceed the natural seasonal variations on the Chayvo OPF grounds.

Based on the observations over the entire monitoring period, the groundwater in wells 007 and 008 at the temporary waste storage site was found to be slightly acidic (рН 5.5-6.5).

The content of petroleum products in the samples collected did not exceed concentrations in natural water and varied from below the detection threshold (˂0.02 mg/dm³) to 0.055 mg/dm³. Groundwater in the observation wells is not contaminated by petroleum products. As of today, no standards for groundwater quality are available. No parasitological and microbiological contamination was recorded in storm runoff water samples during the reporting period. Based on the content of pollutants, the storm runoff does not produce any additional impact on local environmental components (water and soil). The storm water from the temporary waste storage site is collected in a separate drainage system and pumped into deep isolated horizons of the properly provided subsoil area through specially equipped wells. Air quality in the waste storage site area was in full compliance with the requirements of GN 2.1.6.3492-17, Maximum Permissible Concentrations (MPC) of Pollutants in the Air of Urban and Rural Communities. Topsoil at TWSS conformed to GN 2.1.7.2041-06, Maximum Permissible Concentrations (MPC) of Chemicals in Soil, GN 2.1.7.2511-09, Tentatively Allowable Concentrations (TACs) of Chemicals in Soil, and SanPiN 2.1.7.1287-03, Sanitary and Epidemiological Requirements for Soil Quality.

5.9 Monitoring of Bezymyanny Creek Bezymyanny Creek monitoring was performed in 2018. Monitoring surveys of creek depth and current velocity were conducted to identify culvert washout (silting) sections and to take measures aimed at eliminating sediment accumulation in a culvert under a road. Culvert is a sectional structure made of corrugated metal with water surface width 5.5 m and over 2.0 m high. Bezymyanny Creek has its origin on the south shore of Lake Sredneye, runs through a number of smaller lakes, and flows into Chayvo Bay. The creek flows in sub-meridian direction through the marshy area of the Chayvo Spit.

The results of the 2018 field surveys show a minor washout of bottom sediments in the creek channel, and accumulation of these sediments in the road crossing area. Minor sediment deposition in the culvert was observed in June near the culvert’s west rim.

5.10 Monitoring of physical factors 5.10.1 Monitoring of lighting factors Lighting measurements were conducted in 2018. Incandescent and luminescent lamps served as the sources of artificial lighting physical factors during the code compliance assessment of light environment parameters. The study results are in Table 5.10-1.

Table 5.10-1 Results of measuring lighting parameters

Measurement Artificial lighting Flicker Natural lighting Description of offices date (lux) factor (%) (lux) Administration and office building (AOB), office rooms, 1-st floor Office 133, workspace for supervisor 06/25/2018 1100 ≤1 ≥0.5 Office 134, workspace for supervisor 06/25/2018 1400 ≤1 ≥0.5 Office 130, workspace for mechanic (in 06/25/2018 910 ≤1 ≥0.5 the middle) Office 127, workspace for instrument 06/25/2018 1300 ≤1 ≥0.5 technician Office 146А, workspace for engineer 06/25/2018 - ≤1 ≥0.5 Office 136В, workspace for materials 06/25/2018 1100 ≤1 ≥0.5 coordinator Office 137A, workspace for supervisor 06/25/2018 1100 ≤1 ≥0.5 Office 108, workspace for operator (in 06/25/2018 900 ≤1 ≥0.5 the middle by the window) Office 108, workspace for operator (in 06/25/2018 800 ≤1 ≥0.5 the corner by the window) Office 116, Central Control Room, 06/25/2018 400 ≤1 ≥0.5 workspace for operator (on the right) Office 116, Central Control Room, 06/25/2018 400 ≤1 ≥0.5 workspace for operator (on the left) Office 127, workspace for electrical 06/25/2018 1600 ≤1 ≥0.5 technician (by the window, 4th from right) Administration and office building (AOB), office rooms, 2-st floor Ecology Department, workspace for 06/25/2018 400 ≤1 ≥0.5 engineer Ecology Department, workspace for 06/25/2018 400 ≤1 ≥0.5 senior engineer Office 220 (IT specialists), workspace for IT support specialist (to the right from 06/25/2018 800 ≤1 ≥0.5 entrance) Office 220 (IT specialists), workspace for IT support specialist (opposite to 06/25/2018 550 ≤1 ≥0.5 entrance) ENL Logistics, workspace for logistics 06/25/2018 800 ≤1 ≥0.5 coordinator ENL Logistics, workspace for transport 06/25/2018 900 ≤1 ≥0.5 coordinator Logistics office, workspace for logistics 06/25/2018 900 ≤1 ≥0.5 supervisor Document Control, workspace for 06/25/2018 600 ≤1 ≥0.5 document controller

Measurement Artificial lighting Flicker Natural lighting Description of offices date (lux) factor (%) (lux) Champion Technologies Office, workspace for engineer (to the left from 06/25/2018 750 ≤1 ≥0.5 entrance) Champion Technologies Office, 06/25/2018 600 ≤1 ≥0.5 workspace for operator (in the middle) Champion Technologies Office, 06/25/2018 900 ≤1 ≥0.5 workspace for lead engineer HSSE, workspace for administrator 06/25/2018 1100 ≤1 ≥0.5 HSSE, workspace for analyst 06/25/2018 800 ≤1 ≥0.5 HSSE, workspace for technician (by the 06/25/2018 1000 ≤1 ≥0.5 window) HSSE, workspace for hygienist 06/25/2018 1000 ≤1 ≥0.5 HSSE, workspace for technician (to the 06/25/2018 1200 ≤1 ≥0.5 right of the window) Emergency Response, workspace for 06/25/2018 900 ≤1 ≥0.5 analyst Permanent living facility (PLF). Office rooms Office 112. Workspace for analyst 06/25/2018 1200 ≤1 ≥0.5 Office 112. Workspace for supervisor 06/25/2018 1300 ≤1 ≥0.5 Office 111. Workspace for security 06/25/2018 840 ≤1 ≥0.5 manager Office 103. Workspace for badge maker 06/25/2018 560 ≤1 ≥0.5 Office 135. Workspace for camp 06/25/2018 800 ≤1 ≥0.5 manager Standard value ≥400* ≤3* ≥0,5* * Standard values are shown per SanPiN 2.2.4.3359-16, Sanitary and Epidemiological Requirements for Physical Factors at Workplaces, Table P. 9.1 and 9.2

The levels of natural and artificial lighting in all Chayvo OPF premises were in compliance with SanPiN 2.2.2/2.4.1340-03, Health Requirements for Personal Computers and Work Management, SP 52.13330.2016 Natural and Artificial Lighting. Updated version of SNiP 23-05-95*, and SanPiN 2.2.4.3359-16, Sanitary and Epidemiological Requirements for Physical Factors at Workplaces.

5.10.2 Monitoring of microclimate parameters Microclimate parameter measurements in the Chayvo OPF office and accommodation areas were performed during the 2018 warm and cold seasons. The following indices were measured: air temperature, air humidity and air flow velocity. The results of microclimate parameter measurements are presented in Tables 5.10-3 and 5.10-4. Allowable conditions as per GOST 30494-2011, Residential and Public Buildings. Indoor Microclimate Parameters, and SanPiN 2.2.4.548-96, Hygiene Requirements for Microclimate of Indoor Industrial Premises are presented in Table 5.10-2.

Table 5.10-2: Allowable conditions

Rel. Flow Thermal Air temperature Surf. temp. Description of rooms and work places humidity. velocity radiation (Т)°С*** Ts°С*** (f)% (V) m/s (W/m³) Administrative and office premises* Warm season 21.0 <Т< 28.0 15 < f < 75 <0.1 - - Cold season 20.0 <Т< 25.0 15 < f < 75 V<0.1 < 100 19.0 <Т< 26.0 Living quarters Warm season 20.0 < Т < 28.0 <65 <0.3 - - Cold season 18.0 <Т< 24.0 <60 <0.2 - - *- SanPiN 2.2.4.3359-16, Sanitary and Epidemiological Requirements for Physical Factors at Workplaces * – GOST 30494-2011

Table 5.10-3: Results of microclimate parameter analyses in permanent living facility

Description of Rel. Flow Heat Surface Measurement Air temperature rooms and work humidity. velocity radiation, temperature date (Т)°С* places (f)% (V) m/s W/m3* (Ts°С*) Permanent living facility (PLF). Office rooms 20 - 0.5 25 19 01/18/2018 21 25 0.5 25 19 - - - 36 - Office 112. 25 - 0.1 - - Workspace for 25 40 0.1 - - analyst 06/24/2018 25 - 0.1 - - 25 38 0.1 - - 24 - 0.1 - - 24 40 0.1 - - 20 - 0.3 27 19 01/18/2018 20 30 0.3 27 19 - - - 27 - 24 - 0.1 - - Office 112. 24 35 0.1 - - Workspace for 24 - 0.1 - - supervisor 06/24/2018 24 40 0.1 - - 25 - 0.1 - -

25 40 0.1 - - 24 - 0.05 25 20 01/18/2018 24 16 0.05 25 20 - - - 25 - 24 - 0.1 - - Office 111. 24 38 0.1 - - Workspace for security manager 25 - 0.1 - - 06/24/2018 25 40 0.1 - - 25 - 0.1 - - 25 35 0.1 - - 22 - 0.07 25 20 01/18/2018 22 18 0.09 25 20 Office 103. - - - 25 - Workspace for 27 - 0.1 - - badge maker 27 40 0.1 - - 06/24/2018 26 - 0.1 - - 27 40 0.1 - -

Description of Rel. Flow Heat Surface Measurement Air temperature rooms and work humidity. velocity radiation, temperature date (Т)°С* places (f)% (V) m/s W/m3* (Ts°С*) 26 - 0.1 - - 27 38 0.1 - - Office 135 (ISS). Workspace for 01/18/2018 23 - 0.1 25 20 camp manager 22 40 0.1 - - 22 - 0.1 - - 22 35 0.1 - - 22 - 0.1 - - 22 40 0.1 - - Permanent living facility Living quarters 23 18 0.1 - 20 01/18/2018 23 18 0.1 25 - 23 18 0.1 - - 21 40 0.1 - - 21 40 0.1 - - 22 40 0.1 - - Living room C103 22 40 0.1 - - 06/24/2018 22 40 0.1 - - 22 40 0.1 - - 21 40 0.1 - - 21 40 0.1 - - 22 40 0.1 - - 24 18 0.1 - 19 01/18/2018 24 18 0.1 25 - 24 18 0.1 - - 19 50 0.1 - - 19 50 0.1 - - 19 50 0.1 - - Living room C104 19 50 0.1 - - 06/24/2018 19 50 0.1 - - 19 50 0.1 - - 19 50 0.1 - - 19 50 0.1 - - 19 50 0.1 - - 23 22 0.1 - 20 01/18/2018 23 22 0.1 24 - 23 22 0.1 - - 23 35 0.1 - - 23 35 0.1 - - 23 35 0.1 - - Living room E110 23 35 0.1 - - 06/24/2018 23 35 0.1 - - 24 35 0.1 - - 23 35 0.1 - - 23 35 0.1 - - 23 35 0.1 - - 22 18 0.1 - 19 01/18/2018 22 18 0.1 23 - 22 18 0.1 - - 24 35 0.1 - - 24 35 0.1 - - Living room E111 24 35 0.1 - - 24 35 0.1 - - 06/24/2018 24 35 0.1 - - 25 35 0.1 - - 24 35 0.1 - - 24 35 0.1 - -

Description of Rel. Flow Heat Surface Measurement Air temperature rooms and work humidity. velocity radiation, temperature date (Т)°С* places (f)% (V) m/s W/m3* (Ts°С*) 24 35 0.1 - - Living room E201 01/18/2018 24 18 0.1 - 20 24 35 0.1 - - 23 35 0.1 - - 23 35 0.1 - - 24 35 0.1 - - 23 17 0.1 - 19 01/18/2018 23 17 0.1 23 - 23 17 0.1 - - 23 35 0.1 - - 23 35 0.1 - - 23 35 0.1 - - Living room E202 23 35 0.1 - - 06/24/2018 24 35 0.1 - - 24 35 0.1 - - 23 35 0.1 - - 23 35 0.1 - - 24 35 0.1 - - 24 18 0.1 - 19 01/18/2018 24 18 0.1 24 - 24 18 0.1 - - 24 35 0.1 - - 24 35 0.1 - - 24 35 0.1 - - Living room C201 24 35 0.1 - - 06/24/2018 24 35 0.1 - - 25 35 0.1 - - 24 35 0.1 - - 24 35 0.1 - - 25 35 0.1 - - 24 18 0.1 - 18 01/18/2018 24 18 0.1 25 - 24 18 0.1 - - 24 40 0.1 - - 24 40 0.1 - - 24 40 0.1 - - Living room C202 24 40 0.1 - - 06/24/2018 24 40 0.1 - - 25 40 0.1 - - 24 40 0.1 - - 24 40 0.1 - - 25 40 0.1 - - 24 18 0.1 - 18 01/18/2018 24 18 0.1 25 - 24 18 0.1 - - 23 35 0.1 - - 23 35 0.1 - - 23 35 0.1 - - Living room D117 23 35 0.1 - - 06/24/2018 24 35 0.1 - - 24 35 0.1 - - 23 35 0.1 - - 23 35 0.1 - - 23 35 0.1 - - 24 18 0.1 - 19 01/18/2018 24 18 0.1 24 - Living room D120 24 18 0.1 - - 06/24/2018 24 40 0.1 - -

Description of Rel. Flow Heat Surface Measurement Air temperature rooms and work humidity. velocity radiation, temperature date (Т)°С* places (f)% (V) m/s W/m3* (Ts°С*) 24 40 0.1 - - 24 40 0.1 - - 24 40 0.1 - - 25 40 0.1 - - 25 40 0.1 - - 24 40 0.1 - - 24 40 0.1 - - 25 40 0.1 - - 23 18 0.1 - 21 01/18/2018 23 18 0.1 24 - 23 18 0.1 - - 24 35 0.1 - - 25 35 0.1 - - 25 35 0.1 - - Living room F103 25 35 0.1 - - 06/24/2018 25 35 0.1 - - 26 35 0.1 - - 25 35 0.1 - - 25 35 0.1 - - 25 35 0.1 - - 23 17 0.1 - 21 01/18/2018 23 17 0.1 25 - 23 17 0.1 - - 24 35 0.1 - - 24 35 0.1 - - 25 35 0.1 - - Living room F106 24 35 0.1 - - 06/24/2018 25 35 0.1 - - 25 35 0.1 - - 24 35 0.1 - - 24 35 0.1 - - 24 35 0.1 - - 24 20 0.1 - 21 01/18/2018 24 20 0.1 23 - 24 20 0.1 - - 24 35 0.1 - - 24 35 0.1 - - 25 35 0.1 - - Living room F209 25 35 0.1 - - 06/24/2018 25 35 0.1 - - 26 35 0.1 - - 25 35 0.1 - - 25 35 0.1 - - 25 35 0.1 - - 24 20 0.1 - 19 01/18/2018 24 20 0.1 24 - 24 20 0.1 - - 24 35 0.1 - - 24 35 0.1 - - 24 35 0.1 - - Living room F210 25 35 0.1 - - 06/24/2018 25 35 0.1 - - 25 35 0.1 - - 25 35 0.1 - - 25 35 0.1 - - 25 35 0.1 - - 23 19 0.1 - 19 Living room D219 01/18/2018 24 19 0.1 24 - 24 19 0.1 - -

Description of Rel. Flow Heat Surface Measurement Air temperature rooms and work humidity. velocity radiation, temperature date (Т)°С* places (f)% (V) m/s W/m3* (Ts°С*) 24 35 0.1 - - 24 35 0.1 - - 24 5 0.1 - - 24 35 0.1 - - 06/24/2018 25 35 0.1 - - 25 5 0.1 - - 24 35 0.1 - - 24 35 0.1 - - 24 5 0.1 - - 24 18 0.1 - 19 Living room D220 01/18/2018 24 18 0.1 24 - 24 18 0.1 - - 23 35 0.1 - - 23 35 0.1 - - 24 35 0.1 - - 23 35 0.1 - - 06/24/2018 24 35 0.1 - - 24 35 0.1 - - 23 35 0.1 - - 23 35 0.1 - - 24 35 0.1 - -

Table 5.10-4: Results of Camp 1140 microclimate parameter analyses Description of Air Thermal Surface Measurement Rel. humidity. Velocity (V), rooms and work temperature radiation*, temperature*, date *(f)% m/s places (Т)°С* kcal/m3 hr. Ts°С Camp 1140. Living rooms Wing A 23 14 0.1 - 19.0 01/18/2018 23 - 0.1 24 - 24 - 0.1 - - 21 45 0.1 - - 21 45 0.1 - - 22 45 0.1 - - Living room A19 22 45 0.1 - - 06/24/2018 22 45 0.1 - - 23 45 0.1 - - 22 45 0.1 - - 22 45 0.1 - - 22 45 0.1 - - 24 - 0.09 - 20 01/18/2018 24 22 0.1 25 - 24 - 0.1 - - 21 45 0.1 - - 21 45 0.1 - - 22 45 0.1 - - Living room A06 22 45 0.1 - - 06/24/2018 22 45 0.1 - - 23 45 0.1 - - 22 45 0.1 - - 22 45 0.1 - - 22 45 0.1 - - 23 19 0.1 - 19.0 01/18/2018 23 - 0.1 24 - Living room A25 23 - 0.1 - - 22 45 0.1 - - 06/24/2018 22 45 0.1 - -

Description of Air Thermal Surface Measurement Rel. humidity. Velocity (V), rooms and work temperature radiation*, temperature*, date *(f)% m/s places (Т)°С* kcal/m3 hr. Ts°С 22 45 0.1 - - 22 45 0.1 - - 23 45 0.1 - - 23 45 0.1 - - 22 45 0.1 - - 22 45 0.1 - - 22 45 0.1 - - 23 21 0.8 - 20.0 01/18/2018 23 - 0.5 25 - 23 - 0.6 - - 22 45 0.1 - - Living room A28 22 45 0.1 - - 23 45 0.1 - - 06/24/2018 23 45 0.1 - - 23 45 0.1 - - 23 45 0.1 - - 23 45 0.1 - - 23 45 0.1 - - 23 45 0.1 - - Wing B 24 19 0.08 - 21.0 01/18/2018 24 - 0.1 26 - 24 - 0.1 - - 21 38 0.1 - - 21 38 0.1 - - 22 38 0.1 - - Living room B17 21 38 0.1 - - 06/24/2018 21 38 0.1 - - 21 38 0.1 - - 21 38 0.1 - - 21 38 0.1 - - 21 38 0.1 - - 24 15 0.07 - 20.0 01/18/2018 24 - 0.07 24 - 24 - 0.1 - - 21 38 0.1 - - 22 38 0.1 - - 22 38 0.1 - - Living room B16 22 38 0.1 - - 06/24/2018 22 38 0.1 - - 22 38 0.1 - - 22 38 0.1 - - 22 38 0.1 - - 22 38 0.1 - - 24 20 0.1 - 21.0 01/18/2018 24 - 0.1 24 - 24 - 0.1 - - 21 42 0.1 - - 21 42 0.1 - - 22 42 0.1 - - Living room B25 22 42 0.1 - - 06/24/2018 22 42 0.1 - - 23 42 0.1 - - 22 42 0.1 - - 22 42 0.1 - - 22 42 0.1 - - 23 17 0.08 - 20.0 Living room B36 01/18/2018 23 - 0.1 26 - 23 - 0.1 - -

Description of Air Thermal Surface Measurement Rel. humidity. Velocity (V), rooms and work temperature radiation*, temperature*, date *(f)% m/s places (Т)°С* kcal/m3 hr. Ts°С 22 40 0.1 - - 22 40 0.1 - - 23 40 0.1 - - 23 40 0.1 - - 06/24/2018 23 40 0.1 - - 23 40 0.1 - - 23 40 0.1 - - 23 40 0.1 - - 23 40 0.1 - - Wing C 22 31 0.07 - 20.0 01/18/2018 22 - 0.1 24 - 23 - 0.1 - - 21 40 0.1 - - 21 40 0.1 - - Living room C21 21 40 0.1 - - 21 40 0.1 - - 06/24/2018 21 40 0.1 - - 22 40 0.1 - - 21 40 0.1 - - 21 40 0.1 - - 21 40 0.1 - - 23 21 0.1 - 20.0 01/18/2018 23 - 0.1 26 - 23 - 0.1 - - 21 45 0.1 - - 21 45 0.1 - - 22 45 0.1 - - Living room C20 22 45 0.1 - - 06/24/2018 22 45 0.1 - - 22 45 0.1 - - 22 45 0.1 - - 22 45 0.1 - - 22 45 0.1 - - 22 22 0.1 - 20.0 01/18/2018 22 - 0.08 25 - 22 - 0.1 - - 22 38 0.1 - - 22 38 0.1 - - 22 38 0.1 - - Living room C28 22 38 0.1 - - 06/24/2018 22 38 0.1 - - 22 38 0.1 - - 22 38 0.1 - - 22 38 0.1 - - 22 38 0.1 - - 24 22 0.1 - 20.0 01/18/2018 24 - 0.1 24 - 24 - 0.1 - - 22 37 0.1 - - 22 37 0.1 - - 23 37 0.1 - - Living room C33 23 37 0.1 - - 06/24/2018 23 37 0.1 - - 23 37 0.1 - - 23 37 0.1 - - 23 37 0.1 - - 23 37 0.1 - - Wing D

Description of Air Thermal Surface Measurement Rel. humidity. Velocity (V), rooms and work temperature radiation*, temperature*, date *(f)% m/s places (Т)°С* kcal/m3 hr. Ts°С 23 32 0.1 - 20.0 01/18/2018 23 - 0.06 24 - 23 - 0.1 - - 22 37 0.1 - - 22 37 0.1 - - 22 37 0.1 - - Living room D21 23 37 0.1 - - 06/24/2018 23 37 0.1 - - 23 37 0.1 - - 23 37 0.1 - - 23 37 0.1 - - 23 37 0.1 - - 24 16 0.05 - 21.0 01/18/2018 24 - 0.03 24 - 24 - 0.03 - - 24 37 0.1 - - 24 37 0.1 - - 24 37 0.1 - - Living room D21 24 37 0.1 - - 06/24/2018 24 37 0.1 - - 25 37 0.1 - - 24 37 0.1 - - 24 37 0.1 - - 24 37 0.1 - - 22 12 0.1 - 20.0 Living room D28 01/18/2018 23 - 0.1 24 - 23 - 0.1 - - 23 40 0.1 - - 23 40 0.1 - - 23 40 0.1 - - 24 40 0.1 - - 06/24/2018 24 40 0.1 - - 24 40 0.1 - - 23 40 0.1 - - 23 40 0.1 - - 23 40 0.1 - - 24 26 0.1 - 21.0 01/18/2018 24 - 0.1 26 - 24 - 0.1 - - 23 44 0.1 - - 23 44 0.1 - - 24 44 0.1 - - Living room D33 24 44 0.1 - - 06/24/2018 24 44 0.1 - - 24 44 0.1 - - 24 44 0.1 - - 24 44 0.1 - - 24 44 0.1 - - Wing Е 23 22 0.1 - 20.0 01/18/2018 23 - 0.1 25 - 23 - 0.1 - - 23 40 0.1 - - 23 40 0.1 - - Living room E13 23 40 0.1 - - 06/24/2018 23 40 0.1 - - 24 40 0.1 - - 24 40 0.1 - - 23 40 0.1 - -

Description of Air Thermal Surface Measurement Rel. humidity. Velocity (V), rooms and work temperature radiation*, temperature*, date *(f)% m/s places (Т)°С* kcal/m3 hr. Ts°С 23 40 0.1 - - 23 40 0.1 - - 23 17 0.08 - 20.0 01/18/2018 23 - 0.05 25 - 23 - 0.05 - - 22 40 0.1 - - 22 40 0.1 - - 22 40 0.1 - - Living room E10 23 40 0.1 - - 06/24/2018 23 40 0.1 - - 23 40 0.1 - - 23 40 0.1 - - 23 40 0.1 - - 23 40 0.1 - - 22 16 0.1 - 20.0 01/18/2018 23 - 0.1 25 - 23 - 0.1 - - 22 41 0.1 - - 22 41 0.1 - - 23 41 0.1 - - Living room E31 23 41 0.1 - - 06/24/2018 23 41 0.1 - - 23 41 0.1 - - 23 41 0.1 - - 23 41 0.1 - - 23 41 0.1 - - 22 15 0.1 - 20.0 01/18/2018 22 - 0.05 24 - Living room E42 23 - 0.1 - - 23 37 0.1 - - 06/24/2018 23 37 0.1 - - 23 37 0.1 - - 23 37 0.1 - - 23 37 0.1 - - 23 37 0.1 - - 23 37 0.1 - - 23 37 0.1 - - 23 37 0.1 - - * measurement results are provided as follows: 0.1 m from the floor/1.0 m from the floor/1.5 m from the floor During the 2018 measurements, the microclimate parameters in practically all of the indoor areas did not exceed the permissible values set in GOST 30494-2011, Residential and Public Buildings. Indoor Microclimate Parameters, and SanPiN 2.2.4.548-96, Hygiene Requirements for Indoor Microlimate of Production Premises. Air humidifiers are installed in all indoor premises. The heating, ventilation, and air conditioning system is of the standalone type (electric batteries, air conditioner, ventilation). Residents are able to independently set microclimate parameters in rooms.

5.10.3 Vibration level monitoring In 2018, vibration level measurements were performed at the Chayvo OPF facilities. Results of vibration level measurements are presented in Table 5.10-2.

Table 5.10-5: Vibration level measurement results

Vibration vector Vibration acceleration levels (dB) along the axes of In octave frequency bands with center Permissible orthogonal frequencies (Hz) equivalent vibration coordinate acceleration level system. Vibration Actual weighted 1 2 4 8 16 31,5 63 (dB) category: 3 - vibration process acceleration level at the workstation (dB) Standard Z0 (dB) 1121 1118 1115 1116 1121 1127 133 100 Standard X0, Y0 1112 1113 1118 1124 1130 1136 142 97 (dB) Pump Р1-РЕМ64102А Z ------81 100 X ------80 97 Y ------77 97 Pump Р1-РЕМ64102В Z ------86 100 X ------89 97 Y ------84 97 Pump Р1-РЕМ64102С Z ------93 100 X ------89 97 Y ------89 97 Pump P1-PEM64102D Z ------91 100 X ------84 97 Y ------85 97 * - SN 2.2.4/2.1.8.566-96 Laboratory analysis results show that no maximum permissible values (MPV) for overall vibration at workstations in accordance with SN 2.2.4/2.1.8.566-96, Industrial Vibrations and Vibrations in Indoor Premises of Residential and Public Buildings were exceeded at the monitoring points.

5.10.4 Monitoring of EMI from PCs in offices In 2018, electromagnetic interference (EMI) from personal computers (PCs) was measured at the Chayvo OPF. The information on the results of PC EMI measurements conducted in offices is provided in Table 5.10-6.

Table 5.10-6: Results of EMI and electrostatic field strength measurement results Electric field strength (V/m) Magnetic flux density (nT) frequency range Electrostatic Workstation 2 kHz - field strength 5 Hz - 2 kHz - 400 5 Hz - 2 50 Hz 400 50 Hz (kV/m) 2 kHz kHz kHz kHz Permanent living facility (PLF). Office 112. Workspace for 1/1/1 ≤0.8/≤0.8/≤0.8 24/36/16 10/10/10 1/1/1 10/20/28 ≤0.1/≤0.1/≤0.1 analyst Office 112. Workspace for 1/1/1 ≤0.8/≤0.8/≤0.8 34/41/20 10/10/10 1/1/1 8/30/34 ≤0.1/≤0.1/≤0.1 supervisor Office 111. Workspace for 1/2/1 ≤0.8/≤0.8/≤0.8 24/36/16 10/10/10 1/1/1 10/20/28 ≤0.1/≤0.1/≤0.1 security manager Office 103. Workspace for 2/5/1 ≤0.8/≤0.8/≤0.8 34/41/20 10/10/10 1/1/1 22/33/12 ≤0.1/≤0.1/≤0.1 badge maker Office 135 (ISS). Workspace 1/2/1 ≤0.8/≤0.8/≤0.8 24/36/16 10/15/10 1/1/1 33/39/20 ≤0.1/≤0.1/≤0.1 for camp manager Administrative building, 1st floor Office 133. Workspace for 1/1/1 ≤0.8/≤0.8/≤0.8 24/36/16 10/10/10 1/1/1 10/20/28 ≤0.1/≤0.1/≤0.1 supervisor Office 134. Workspace for 1/1/1 ≤0.8/≤0.8/≤0.8 24/36/16 10/10/10 1/1/1 10/20/28 ≤0.1/≤0.1/≤0.1 supervisor Office 130. Workspace for 1/1/1 ≤0.8/≤0.8/≤0.8 38/41/24 10/10/10 1/1/1 31/36/20 ≤0.1/≤0.1/≤0.1 mechanic (in the central area) Office 127. Workspace for 1/1/1 ≤0.8/≤0.8/≤0.8 24/32/20 10/10/10 1/1/1 29/34/22 ≤0.1/≤0.1/≤0.1 plant shutdown coordinator Office 127. Workspace for 1/1/1 ≤0.8/≤0.8/≤0.8 30/40/22 10/10/10 1/1/1 27/32/18 ≤0.1/≤0.1/≤0.1 planning lead Office 146A. Workspace for 2/3/1 ≤0.8/≤0.8/≤0.8 30/40/22 10/10/10 1/1/1 27/32/18 ≤0.1/≤0.1/≤0.1 engineer Office 136B. Workspace for 2/2/2 ≤0.8/≤0.8/≤0.8 24/32/14 10/10/10 1/1/1 16/18/26 ≤0.1/≤0.1/≤0.1 material coordinator Office 137A. Workspace for 1/1/1 ≤0.8/≤0.8/≤0.8 24/32/20 10/10/10 1/1/1 29/34/22 ≤0.1/≤0.1/≤0.1 supervisor Office 108. Workspace for operator (in the middle by the 2/3/2 ≤0.8/≤0.8/≤0.8 24/36/16 10/10/10 1/1/1 10/20/28 ≤0.1/≤0.1/≤0.1 window) Office 108. Workspace for operator (in the corner, by the 1/2/1 ≤0.8/≤0.8/≤0.8 49/61/40 10/10/10 1/1/1 43/51/28 ≤0.1/≤0.1/≤0.1 window) Office 116. Central Control Room Workspace for operator 1/1/1 ≤0.8/≤0.8/≤0.8 34/41/20 10/10/10 1/1/1 8/30/34 ≤0.1/≤0.1/≤0.1 (right side) Office 116. Central Control Room Workspace for operator 1/2/1 ≤0.8/≤0.8/≤0.8 24/32/14 10/10/10 1/1/1 16/18/26 ≤0.1/≤0.1/≤0.1 (left side) Administrative building, 2st floor Environmental Group. 4/1/1 ≤0.8/≤0.8/≤0.8 38/41/24 10/10/10 1/1/1 31/36/20 ≤0.1/≤0.1/≤0.1 Workspace for engineer Environmental Group. 7/5/1 ≤0.8/≤0.8/≤0.8 24/36/16 10/10/10 1/1/1 10/20/28 ≤0.1/≤0.1/≤0.1 Workspace for senior engineer Office 220 (IT specialists). workspace for IT-support 5/2/1 ≤0.8/≤0.8/≤0.8 34/41/20 10/10/10 1/1/1 8/30/34 ≤0.1/≤0.1/≤0.1 specialist (to the right of the entrance) Office 220 (IT specialists). workspace for IT-support 5/2/1 ≤0.8/≤0.8/≤0.8 34/41/20 10/10/10 1/1/1 8/30/34 ≤0.1/≤0.1/≤0.1 specialist (to the right of the entrance) Office 220 (IT specialists). workspace for IT-support 7/5/1 ≤0.8/≤0.8/≤0.8 38/41/24 10/10/10 1/1/1 31/36/20 ≤0.1/≤0.1/≤0.1 specialist (opposite to entrance)

Electric field strength (V/m) Magnetic flux density (nT) frequency range Electrostatic Workstation 2 kHz - field strength 5 Hz - 2 kHz - 400 5 Hz - 2 50 Hz 400 50 Hz (kV/m) 2 kHz kHz kHz kHz ENL Logistics. Workspace for 3/1/1 ≤0.8/≤0.8/≤0.8 24/36/16 10/10/10 1/1/1 10/20/28 ≤0.1/≤0.1/≤0.1 logistics coordinator Logistics office. workspace for 8/5/1 ≤0.8/≤0.8/≤0.8 34/41/20 10/10/10 1/1/1 8/30/34 ≤0.1/≤0.1/≤0.1 logistics supervisor Document Controls. Workspace for document 1/1/1 ≤0.8/≤0.8/≤0.8 38/41/24 10/10/10 1/1/1 31/36/20 ≤0.1/≤0.1/≤0.1 controller Champion Technologies Office. Workspace for 1/1/1 ≤0.8/≤0.8/≤0.8 24/36/16 10/10/10 1/1/1 10/20/28 ≤0.1/≤0.1/≤0.1 engineer (to the left of the entrance) Champion Technologies Office. Workspace for 1/1/1 ≤0.8/≤0.8/≤0.8 34/41/20 10/10/10 1/1/1 8/30/34 ≤0.1/≤0.1/≤0.1 engineer (central area) Champion Technologies Office. Workspace for lead 2/3/1 ≤0.8/≤0.8/≤0.8 38/41/24 10/10/10 1/1/1 31/36/20 ≤0.1/≤0.1/≤0.1 engineer MPL* 25 2.5 - 250 25 - 15

The electric field strength values measured in the Chayvo OPF indoor premises fully conform to the standard values (SanPiN 2.2.2/2.4.1340-03, Health Requirements for Personal Computers and Organization of Work, Attachment 2, Table 1).

5.10.5 Monitoring of parameters of industrial-frequency electromagnetic fields The following parameters were measured in 2018: electric field strength, magnetic flux density, and electrostatic field strength in the following indoor areas:  Module 12. Oil export pumps;  Module 13. Power generators room;  Module 3. Gas injection compressors;  Module 4. Gas injection compressors. The information on electric field strength, magnetic flux density, and electrostatic field strength measurement results is provided in Table 5.10-7.

Table 5.10-7: Results of EMI and electrostatic field strength measurements in indoor industrial areas Electric field strength (V/m) Magnetic flux density (nT) frequency range Electrostatic Workstation 2 kHz - field strength 5 Hz - 2 2 kHz - 400 5 Hz - 2 50 Hz 400 50 Hz (kV/m) kHz kHz kHz kHz Module 12, oil export pumps Oil export pump Р1- - - 72/102/57 - - 31/50/21 0.62/0.62/0.62 РЕ64102А

Electric field strength (V/m) Magnetic flux density (nT) frequency range Electrostatic Workstation 2 kHz - field strength 5 Hz - 2 2 kHz - 400 5 Hz - 2 50 Hz 400 50 Hz (kV/m) kHz kHz kHz kHz Oil export pump Р1- - - 88/75/51 - - 60/2921 0.73/0.73/0.73 РЕ64102В Oil export pump Р1- - - 51/84/41 - - 62/33/22 0.68/0.68/0.68 РЕ64102С Oil export pump P1- - - 45/53/38 - - 83/72/24 0.61/0.61/0.61 PE64102D Module 13, power generators room Turbine room – lower level 1/1/1 0.01/0.01/0.01 62/55/40 10/10/10 1/1/1 68/59/25 0.42/0.42/0.42 Turbine room – second level 1/1/1 0.01/0.01/0.01 79/63/34 40/40/10 1/1/1 89/75/43 0.53/0.53/0.53 Turbine room – upper level 1/1/1 0.01/0.01/0.01 68/5162 10/10/10 1/1/1 70/53/34 0.69/0.69/0.69 Turbine air filters inlet 1/1/1 0.01/0.01/0.01 19/17/14 10/10/10 1/1/1 26/19/15 0.35/0.35/0.35 Module 14, power generators room Turbine room – lower level 1/1/1 0.01/0.01/0.01 94/82/31 80/40/40 1/1/1 84/73/26 0.82/0.82/0.82 Turbine room – second level 2/2/2 0.01/0.01/0.01 52/42/22 10/10/10 1/1/1 60/51/41 0.51/0.51/0.51 Turbine room – upper level 1/1/1 0.01/0.01/0.01 46/42/31 10/10/10 1/1/1 72/51/44 0.63/0.63/0.63 Turbine air filters inlet 1/1/1 0.01/0.01/0.01 35/31/26 10/10/10 1/1/1 55/36/41 0.48/0.48/0.48 Module 3. Gas injection compressors Lower level – turbine engine 1/1/1 0.01/0.01/0.01 84/82/50 10/10/10 1/1/1 38/29/24 0.78/0.78/0.78 compartment Lower level - gas injection 3/3/4 0.01/0.01/0.01 75/55/43 40/40/40 4/4/4 40/36/22 0.95/0.95/0.95 compressors Module 4. Gas injection compressors Lower level – turbine engine 1/1/1 0.01/0.01/0.01 67/60/25 10/10/10 1/1/1 37/35/23 0.64/0.64/0.64 compartment Lower level - gas injection 1/1/1 0.01/0.01/0.01 79/91/42 10/10/10 1/1/1 69/47/23 0.57/0.57/0.57 compressors 80 A/m or MPL* 25 2.5 - 250 25 100 μT** or <15 100,000 nT * -* SanPiN 2.2.4.3359-16, Sanitary and Epidemiological Requirements for Physical Factors at Workplaces ** – Conversion: 1 A/m ~ 1.25 μT ***- measurement results are provided as follows: 0.1 m from the floor/1.0 m from the floor/1.5 m from the floor Electric field strength, magnetic flux density, and electrostatic field strength in the indoor areas did not exceed the maximum permissible levels specified in SanPiN 2.2.4.3359-16, Sanitary and Epidemiological Requirements for Workplace Physical Factors.

5.10.6 Energy flux density monitoring In 2018, energy flux density measurements were performed for the frequency range from 300 MHz to 300 GHz. The measurements were performed at 4 locations.  20 m north of the edge of the transceiver platform;  20 m east of the edge of the transceiver platform;  20 m south of the edge of the transceiver platform;  20 m west of the edge of the transceiver platform.

The data on the EMI energy flux density measurement results (frequency range 300 MHz - 300 GHz) are provided in Table 5.10-8.

Table 5.10-8. EMI energy flux density measurement results (frequency range 300 MHz - 300 GHz) Distance from the edge of the transceiver EMI energy flux density (μW/cm2) (frequency range 300 platform MHz - 300 GHz) 20 m to the north ≤0.1 20 m to the east ≤0.1 20 m to the south ≤0.1 20 m to the west ≤0.1 MPL* 1000 MPL** 10 * - SanPiN 2.1.8/2.2.4.1383-03, Hygienic Requirements for the Positioning and Operation of Radio-Technical Transmission Facilities (Attachment 1, Table 1, Maximum permissible EMI levels in the frequency range of 30 kHz - 300 GHz at personnel workstations) * - SanPiN 2.1.8/2.2.4.1383-03, Hygienic Requirements for the Positioning and Operation of Radio-Technical Transmission Facilities (Attachment 1, Table 1, Maximum permissible EMI levels in the frequency range of 30 kHz - 300 GHz for communities)

Based on the results of the measurements performed in 2018 at the monitoring points, EMI in the frequency range 30 kHz - 300 GHz did not exceed the maximum permissible level per SanPiN 2.1.8/2.2.4.1383-03, Hygienic Requirements for the Positioning and Operation of Radio-Technical Transmission Facilities.

5.10.7 Thermal radiation intensity monitoring In 2018, thermal radiation intensity parameters were measured in four directions 200 m away from the high-pressure (HP) and low-pressure (LP) flare stacks. The measurements were performed at elevations of 0.1, 1.0, and 1.5 m. The thermal radiation intensity measurement results are provided in Table 5.10-9.

Table 5.10-9. Thermal radiation intensity monitoring results

Thermal radiation intensity (irradiance) Measurement locations from source: HP and Measurement Measurement date LP flare stacks Unit of measur. date 01/17/2018* 06/24/2018* north of the source 23; 23; 23 ≤10 east of the source 28; 28; 28 ≤10 W/m3 west of the source 27; 27; 27 ≤10 south of the source 29; 29; 29 ≤10 * measurements were conducted at the following elevations: 0.1; 1.0; 1.5 m. Thermal radiation intensity is consistent with the standard requirements of SanPiN 2.2.4.548-96, Hygiene Requirements for Microlimate of Production Premises.

In terms of personnel exposure, the maximum permissible intensity of thermal radiation from sources heated to a white or red glow (hot or molten metal, glass, flame, etc.) shall not exceed 140 W/m2. In this case, no more than 25% of the body surface area may be exposed to radiation, and the use of personal protective equipment, including protection for the face and eyes, is mandatory.

5.10.8 Ionizing radiation monitoring In 2018, ionising radiation intensity parameters were measured in four directions 200 m away from the high-pressure (HP) and low-pressure (LP) flare stacks at Chayvo OPF. The ionising radiation intensity measurement results are provided in Table 5.10-10.

Table 5.10-10. Ionizing radiation monitoring results

Measurement point Measurement results (μSv/hr.) Permissible value

Point 1 0.150 ≤2.5 Point 2 0.215 ≤2.5 Point 3 0.180 ≤2.5 Point 4 0.170 ≤2.5 * – The standard values are given per SanPiN 2.6.1.2523-09, Radiation Safety Standards (NRB-99/2009) In 2018, the ionizing radiation in the vicinity of the flare stack was fully compliant with SanPiN 2.6.1.2523-09. Radiation Safety Standards (NRB-99/2009) and SP 2.6.1.1291-2003, Occupational Health Rules for Radiation Safety at Russia’s Oil and Gas Industry Facilities.

List of references

1. GN 2.1.5.1315-03 Maximum Permissible Concentrations (MPC) of Chemicals in Water from Domestic and Public Supply Sources. 2. GN 2.1.5.2280-07 Maximum Permissible Concentrations (MPC) of Chemicals in Water from Domestic and Public Supply Sources. 3. * - GN 2.1.6.3492-17, Maximum Permissible Concentrations (MPC) of Pollutants in the Air of Urban and Rural Communities. 4. GN 2.1.8/2.2.2.4.4.2262-07 Maximum Permissible Levels of 50 Hz Magnetic Fields in Indoor Premises of Residential and Public Buildings and in Residential Areas. 5. GN 2.2.5.1313-03 Maximum Permissible Concentrations (MPC) of Toxic Substances in Workplace Air. 6. GN 2.2.5.1827-03 Maximum Permissible Concentrations (MPC) of Toxic Substances in Workplace Air. Addendum 1 to GN 2.2.5.1313-03. 7. GOST 17.2.3.01-86 Environmental Protection. Atmosphere. Air Quality Monitoring Rules for Populated Areas. 8. GOST 31296.1-2-2005 (2006). Description, Measurement, and Field Assessment of Noise. 9. Procedural Guidelines for Equipping Sampling Sites during Environmental/ Analytical Monitoring of Industrial Air Emissions. 10. MU 2.1.5.800-99 Water Disposal in Residential Areas and Health Protection of Water Bodies, Organizing Public Health Inspection of Waste Water Decontamination. 11. MU 4109-86 Procedural Guidelines for Measuring the Electromagnetic Field of High- Voltage Overhead Power Lines and Health Requirements for Their Placement. 12. MUK 4.2.1018-01 Microbiological Sanitary Analysis of Potable Water. 13. MUK 4.2.2661-10 Sanitary and parasitological study methods 14. MUK 4.3.2194-07 Procedural Guidelines. Noise Level Monitoring in Residential Development Areas, Residential and Public Buildings and Indoor Areas. 15. SanPiN 2.1.4.1074-01 Potable Water. Health Requirements for Water Quality of Centralized Potable Water Supply Systems. Quality Control. 16. SanPiN 2.1.5.980-00 Hygienic Requirements for Surface Water Protection. 17. SanPiN 2.2.4.3359-16, Sanitary and Epidemiological Requirements for Physical Factors at Workplaces 18. SN 2.2.4/2.1.8.562-96, Noise at Workplaces, in Indoor Areas of Residential and Public Buildings, and in Residential Development Areas. 19. Volume on maximum permissible emissions/discharges for Chayvo OPF.

Attachment: List of instruments used for workplace environmental monitoring INSTRUMENT CALIBRATION TECHNICAL PARAMETERS VERIFICATION А-01 aspirator

№243 Setting gas flow rates of up to 45 dm3/min through April 1, 2019 Measurement error: 5 %

GANK-4 gas analyzer

№17005110229 Measurement range: from 0.5 average daily MPC through April 3, to 20 single MPC 2019 Measurement error no greater than 20%

Single-channel aspirator АВА-1-120-02А Sample volume (dm3/min) is not limited.

No. 64-17 through Sample volume measurement accuracy – 5% April 9, 2018

Automatic air aspirator АВА-3-180-01А

Capacity: at least 180 dm3/min No. 63-18 through Flow rates by line: each of the three lines: from 60 to May 17, 2019 130 dm3/min, total: 250 dm3/min Measurement error: 5 %

OP-824 TTs aspirator Setting gas flow rate from 0.2 to 20.0 L/min Range of flow rate settings: lines 1, 2 - 0.2-1.0 L/min lines 3, 4 - 5.0-20.0 L/min No. 68-17 through April 9, 2018 Gas flow rate setting increments by range: 0.2-1.0 L/min: 0.2 L/min 5,0-20,0 L/min: 5,0 L/min Pitot tube Used to measure volumetric flow of liquid and gas at one point of the cross-section of cylindrical pipe No. 0114-2018 having a diameter of at least 300 mm. through January 30, 2019 Pitot tubes are used along with DTTs-01-type differential pressure gauges for measuring velocities in gas ducts and ventilation systems.

INSTRUMENT CALIBRATION TECHNICAL PARAMETERS VERIFICATION M-67 barometer No. 1187

Atmospheric pressure measurement range, kPa No. 649 through (mmHg) from 80 to 120 (from 610 to 790) September 15,

2018 Allowable error after correction (mm Hg): ± 0.8

Expert gas analyzer The gas analyzer is designed for automatic continuous monitoring of harmful substance № 878516 concentrations in the atmospheric air and in through September industrial emissions. 3 8, 2017 Units of measure: mg/m , ppm, mg O2 (in terms of basic O2 content). Operating temperature: from -30 to +50°С.

Polar T Ex gas analyzer

The gas analyzer is designed for automatic continuous monitoring of harmful substance № 373104 concentrations in the atmospheric air and in through March 8, industrial emissions. 3 2019 Units of measure: mg/m , ppm, mg O2 (in terms of basic O2 content). Operating temperature: from -40 to +45°С.

БКП-3

Designed to measure air-gas mixture temperature at aspirator’s variable area flow meter, to monitor negative pressure effects in gas ducts during dust test sample collection, and to collect water vapor condensate from the sampled gas-air mixture.

DKS-AT1123 radiation detector No. 50651 Instrument for measuring X-ray and gamma radiation: ▪continuous long-term action ▪continuous short-term action ▪pulse action

No. 4/410-3012 Measured concentration range: through December ▪continuous long-term and short-term 18, 2017 radiation,15 keV-3 MeV ▪pulse action, 15 keV-10 MeV

Measurement error no greater than 20% ▪continuous long-term and short-term radiation, ±15% ▪pulse action ±30% DRBP-03 radiation dosimeter/radiometer Device for measuring the equivalent dose and No. 17/10247 equivalent dose rate of ionizing photon radiation and through June 12, flux density of α- and β-emissions. 2018

INSTRUMENT CALIBRATION TECHNICAL PARAMETERS VERIFICATION Energy range of metered ionizing photon radiation: 0.05–3.0 MeV. Metered energy range of α-emission Pu-239 and β-emission 0.15–3.5 MeV. Equivalent dose rate measurement range 0.10– 3×106 μSv/hr. Equivalent dose measurement range 0.01–104 mSv. Main relative measurement error: 15%.

OKTAVA-110A noise meter/spectral analyzer No. А081384

The instrument is designed for professional field and laboratory measurements of sound, infrasound, ultrasound, overall and local vibration, building and № 17/6126 machinery vibration, and for frequency analyses of through April 25, signals produced by various primary transducers 2018 (microphones, vibration sensors, pressure fluctuation sensors, measuring antennas, etc.), and so on.

Assistant noise and vibration analyzer

The noise meter is designed for measuring noise №18/11314 levels and sound pressure levels and performing through April 11, frequency analysis over sound, infrasound, and 2019 ultrasound frequency ranges.

Zaschita-K acoustic calibrator

No. 3/340-2607-17 The acoustic calibrator is designed for calibration of through December noise meters. 20, 2018

INSTRUMENT CALIBRATION TECHNICAL PARAMETERS VERIFICATION TKA-PKM integrated pulse/lux meter (Kit 08) No. 08 1843 The instrument is designed for measuring flicker index of various randomly located light sources and light levels over the visible spectrum (380-760 nm).http://www.tkaspb.ru/main/index.ph № 05.015171.16 p?aux_pages=16 - Direct_method through December Lighting measurement range: 10 ÷ 200,000 lx 12, 2017 Main relative lighting measurement error (max.) ± 8,0 % Flicker index measurement range 1 ÷ 100 % Main relative flicker index measurement error ± 10,0 %

P3-50 electromagnetic radiation meter No. 2131 P3-50 electromagnetic radiation meter is designed for: measuring electromagnetic field energy flux density № 2/204-14052-17 over a frequency range of 0.3-40 GHz; through May 23, 2018 measuring electromagnetic field strength over a frequency range of 0.01-300 MHz; measuring magnetic field strength over a frequency range of 0,01-50 MHz;

P3-41 electromagnetic radiation meter

P3-41 meter is designed to detect and monitor № 2/204-14027-17 biologically hazardous levels of electromagnetic through March 28, radiation, strength and energy flux density and 2018 exposure.

VE-Metr AT-002 electric and magnetic field meter

The instrument is designed for measuring RMS № 6025/17-Э values of EMI over a range of radiation frequencies through November typical of personal computer screens. 1, 2019 Permissible relative measurement error limit: 20%.

INSTRUMENT CALIBRATION TECHNICAL PARAMETERS VERIFICATION Meteoskop microclimate measuring instrument Temperature measurement range: from -40 to +85ºС Relative humidity measurement range: from 3 No. 207/17-17960п to 97% through October 31, Air velocity measurement range: from 0.1 to 20 2019 m/s Air pressure measurement range: from 80 to 110 kPa (from 600 to 825 mmHg)

EU-100 level gauge, serial No. 506.13

Not listed in the Maximum measurement level for EU-100: 100 m Register of Water level alarm: instruments requiring calibration - visual verification - audible

HI 98312 conductivity meter

Range of measurements: No. 18/00199 EC 0.00 - 20.00 mS/cm (±0.01 mS/cm) through February 5, 2019 TDS 0.00 - 10.00 ppt (±0.01 ppt) Temperature: 0.0 - 60.0°C (±0.1°C)

PE-1110 sampler

Sample volume: 0.5-1.0 L

Does not require Sampling depth: 0.3–2.0 m calibration Type of sampling container – polyethylene or glass verification bottle

System material: fluoroplast