Resource Efficiency:
The project will use gas-fired combined cycle gas turbine (CCGT) technology, which by recovering waste heat from gas turbines for additional power generation is one of the most energy efficient power generation technologies. The ESIA concluded that the overall approximate efficiency rating is expected to be about 55.91% “gross” on Lower Heating Value basis.
Greenhouse Gases:
The project greenhouse gas (“GHG”) emissions in operation are expected to be approximately 371 g CO
2
/kWh gross with a total annual GHG emission of approximately 785,000 tones CO
2
. This value is within the range of the typical CO
2
eq emissions provided in the WBG EHS Guidelines for Thermal Power Plants (CCGT with 51% efficiency gross: 396 g CO
2
/kWh gross). These values are much lower than those of Power Plants fired by coal or oil. Based on the high efficiency of the selected technology, no additional GHG reduction measures are required during the operational phase.
Air Emissions and Ambient Air Quality:
The most significant construction activities with potential air quality impact is fugitive dust emissions from the power plant site including excavation and filling, materials handling, vehicle movement on the haul roads and wind erosion of open stockpile area or open bare ground as well as combustion source emissions from vehicle movement and non-road machineries. Construction activities will temporarily contribute to increased levels of dust. Mitigation measures to control dust emissions during construction phase are included in the ESMP and shall be implemented by the EPC contractor.
The most significant operational phase air quality impact is power plant stack emissions due to combustion of natural gas during the operation of the project. Background air quality was measured for nitrogen dioxide (NO
2
) and Sulphur dioxide (SO
2
) at five selected baseline air sampling locations for seven consecutive days in July 2017 using passive sampling tubes, and for particulate matters (PM) including respirable suspended particulates (PM10) at three selected baseline air sampling locations for five consecutive days in August 2017 using portable testing equipment. Average background concentrations for summer are consistent with those of a non-degraded airshed as the summer average NO
2
levels of about 15 µg/m
3
is below the World Health Organization (WHO) Ambient Air Quality Guidelines (AAQG) of 40µg/m3. Background levels of PM10 were also low at approximately 16 µg/m
3
during summer sampling period.
The project consists of one gas turbine generating unit, one heat recovery steam generator (HRSG) and one steam turbine generating unit with associated auxiliary equipment. The gas turbine is equipped with dry low NOx (DLN) burners as a primary NOx control feature and operational NOx emissions will be limited to 51 mg/Nm3 at 15% excess O
2
(dry) in compliance with the relevant WBG Thermal Power EHS Guidelines and EU standards. At 66 meters, the main heat recovery steam generator (HRSG) stack height is designed according to GIIP to avoid excessive ground level concentrations due to downwash, wakes, and eddy effects, and to ensure reasonable diffusion to minimize impacts.
As previously noted, based on the air dispersion modeling of the suplemental ESIA, performed using AERMOD, it was concluded that
that ground level concentrations (GLCs) of NOx from the overall contribution of YCCPP-1 and YCCPP-2 will remain below ambient air quality reference values for the 1-hr and annual averaging periods but will exceed the Armenian NOx standard for the 24-hr averaging period. ADC results also indicate that the project’s contribution to the ambient air quality headroom will be greater than 25% of the applicable reference values and standards for the 1-hr and 24-hr averaging periods. Assessment of impacts to ambient air quality will be further updated based on the results of additional baseline measurements as described in ESAP Item #1.
Due to concerns about the aforementioned, potentially significant, incremental impacts from the project and as described in ESAP Item #9, the sponsor will design and built the YCCPP-2 project with a transition spool between the gas turbine’s exhaust and the HRSG to allow for the possible, future, installation of a selective catalytic reduction (SCR) unit (and related ancillary installations for the handling and storage of ammonia). The SCR will be installed if, at the end of two years of continuous ambient air quality monitoring during the operational phase, it is determined that: (a) the airshed has become degraded for NOx as measured by the 1-hr and annual averaging periods due to the project’s significant contribution to background and (b) the installation of the SCR is projected to result in a significant improvement to the airshed (to a non-degraded status for NOx). Evaluation of the need to install an SCR will be made by an independent third party acceptable to the Sponsor and IFC.
Over this two year period, NO
2
monitoring will be conducted with
continuous methods (at least at hourly intervals) at two locations, one predicted maximum ground level concentration location and one background site.
Water Consumption:
The ESIA shows that the project will require 300,000 m
3
water per month. The maximum water flow rate during operating period will be 450 m³/h on annual average. Evaporative cooling towers will use the highest share of the raw water of approximately 310 m³/h. Water supply during operation will be received from the Yerevan potable water grid and will be used for both utility and process water.
As described in the ESAP item #1, the sponsor will assess potential impacts on Yerevan water grid of utilizing both utility and process water for the proposed YCCP-2.
Noise:
The ESIA included an assessment of potential impacts due to construction and operational noise. It identified the main sources of noise during construction to include use of powered mechanical equipment; site preparation, pile driving and foundation works; installation of equipment; and construction of the infrastructure such as internal access roads, storm water drains and security fence. The main sources of noise associated with the operation of the power plant are expected to include the heat recovery steam generators (HRSG), gas turbines, and steam turbine. The key assumption for the noise assessment is that construction activities will take place during daytime hours while operation of the power plant will be generally 24 hours per day throughout the year.
The ESIA identified the nearest noise sensitive receivers (NSRs) to the project site such as a residential area, Ayntap and Noragavit with the nearest receptor located approximately 1,700 m to the southwest and 1750 m to the west of the project site, respectively, Kharbard horticultural settlement located approximately 1,100 m to the south of the project site, and temporary housing located about approximately 500 m to the northeast of the project site. Baseline ambient noise monitoring was conducted by a monitoring survey in 2017 at the five monitoring locations including NSRs. Average background noise levels in the residential area of Noragavit were found to be already above the WBG EHS Guidelines values (which are from WHO Guidelines for Community Noise) for daytime noise levels (about 70 dBA, above the 55dB(A) guideline applicable from 7:00 hrs to 22:00 hrs) and above night-time guideline levels (about 60 dBA, above the 45dBA guideline applicable from 22:00 hrs to 7:00 hrs). Night time background noise levels measured at Ayntap residential area was also found to be above night-time guideline levels.
The potential impacts from incremental noise during operation were evaluated in the ESIA using the methodology outlined in ISO9613-2 with SOUND PLAN noise mapping software, which generates noise contours based on assumed noise emissions levels of activities and operating equipment to provide an overall view of the predicted noise levels around the project site. The modeling results indicate that sound levels generated by operation of the YCCPP-2 only will not result in exceedances of WHO noise guidelines both for day-time and nigh-time. A cumulative noise impact assessment (plant operational contribution + measured background noise levels) was also undertaken for the ESIA. The cumulative noise impact modeling results indicate that residential area in Noragavit may be exposed during both day and night to noise levels in excess of WHO guidelines although the incremental contribution from YCCPP-2 is not considered significant as it is expected to be less than 0.1dB(A). Similarly, residential area at Ayntap may be exposed during night to noise levels in excess of WHO guidelines, mainly due to existing high background noise levels and incremental contribution from YCCPP-2 is not considered significant as it is expected to be about 0.15dB(A)
Based on these results, the ESIA recommends the use of active noise mitigation measures during the construction phase but not during the operational phase.
As described in the ESAP item #2, going forward, the sponsor will require the EPC contractor to develop and implement a construction phase noise management plan which incorporates direct noise mitigation such as movable noise barriers.
Liquid Effluents:
All process waste water (approximately 70 m3/h) resulting mainly from pre-treatment and demineralization of process water, boiler make-up, and evaporative cooler will be treated in an onsite wastewater treatment plant and discharged into existing discharge system of YCCPP-1 for final discharge into Hrazdan river. Since there are no Armenian standards for the quality of the liquid effluents, the limits applicable to the effluents of the YCCPP-2 will be defined by the Ministry of Nature Protection based on a nationally recognized calculation method and will also meet applicable effluent discharge guidelines for the WBG EHS Guidelines for Thermal Power (2008). Sanitary wastewater (approximately 14 m3/h) will be collected and discharged into the city municipal sewerage system. According to the updated ESIA, storm water from internal roads and other paved areas will be collected and led to the waste water treatment plant, storm water from roofs and shelters will be collected in an underground tank for reusing the water without any treatments for irrigation inside the YCCPP-2 site.
As noted in the ESAP item #1, the sponsor will complete a baseline assessment for current pollution load at the wastewater discharge point that is Hrazdan river including upstream, downstream and point of discharge locations, and assess impact of wastewater discharge to receiving water body including thermal impact assessment and ensure that wastewater discharge from construction and operational activities meets applicable WBG General EHS Guidelines and EHS Guidelines for Thermal Power Plants (2008) values. t.
?
Hazardous and Non-Hazardous Waste Management:
During project construction phase, the waste will be generated during earthworks, construction of the fence, road access and buildings. The main types of waste are expected to be sand, gravel, concrete, asphalt, scrap steel, glass plastic, wood, packaging waste and municipal waste from construction workers. A site-specific Construction Waste Management Plan (CWMP) will be included as part of the CESMP. The EPC contractor will work closely with the city of Yerevan to identify acceptable landfill for disposal of the construction waste. With regards to operational phase relatively low volumes of waste are anticipated to be generated both solid waste (non-hazardous and hazardous) and general domestic waste arising from offices. Both the EPC Contractor and O&M Contractor will implement hazardous waste management to minimize and control of release of hazardous materials (e.g. used oils, chemicals for water treatment, water quality analysis, and wastewater treatment). Draft final ESIA states that currently there are no hazardous waste handling facilities in Armenia. Therefore, hazardous waste produced during construction and operation is planned to be stored on site until country has proper handling facilities for final disposal. A detailed plan for storage (above and underground) and handling of hazardous waste on site will be included in the waste management plan as per ESAP#2 and #3.
Historical land contamination:
Areas of the project site have historically been used for the temporary storage of the waste and scrap metal. During the site visit a potentially contaminated land was identified in the project site. As per ESAP Item #10, the sponsor will conduct additional soil sampling at potentially contaminated land within the project site to identify potential significant soil contamination. Soil samples should be taken at historically potentially contaminated land according to GIIP sampling and analytical methods and analyzed according at accredited laboratories for the following parameters: TPH, PAH, BTEX, and Heavy Metals. According to results of soil sampling, sponsor will implement mitigation and remediation measures consistent with the contaminated land guidance provided in the WBG General EHS Guidelines.
Groundwater contamination and ground water table:
The supplemental ESIA report states that groundwater samples were collected at the potentially contaminated land within the project site in order to investigate potential groundwater pollution. Additional assessment is needed as stated in ESAP item#10 to establish a robust baseline of the groundwater quality at the proposed project site. The Supplemental draft final ESIA report states that groundwater might be lowered temporarily during construction or permanently. In such a case, as stated in ESAP item #11, a detailed assessment including groundwater hydrological modeling will be conducted by the client