ACWA 1,500 MW Syrdarya CCGT Project – Ground Investigation Program
ACWA is developing a 1,500 MW CCGT project through bilateral agreement with the GoU and signed a 25-year PPA in March 2020 on a BOOT basis. GoU is also developing another similar CCGT project in the adjacent area with the support of IFC. The proposed site area for the projects are located near the existing Syrdarya TPP, which with the capacity of 3,050 MW is the largest power plant in Uzbekistan. Recently 4 units or a total of 950 MW of the Syrdarya TPP have been rehabilitated and they are expected to be used for regulated capacities even though other old units are to be decommissioned in line with the implementation of new CCGT power plants. All of these factors make the Project technically the most complex in Uzbekistan power system.
The Client has requested the Consultant to provide services for a number of packages including ground investigation studies covering geotechnical, topographic, hydrological, meteorological and water supply for ACWA CCGT project.
Geotechnical investigation as per ASTM standards
- 14 boreholes with depth up to 30 meter and 1 up to 50 meter, SPT test at each borehole, PLT at 4 points, field CBR at 4 points; 1 downhole test; CPT at 6 points; ERT, TRT tests at 6 points.
- Laboratory tests of soil properties
- 85 Ha area with 1:500 scale topographic survey.
- Established planimetric control points using Differential Global Positioning System (DGPS) and collection of all topographical details
- Accuracy of measurements ±100 mm in both vertical and horizontal directions
- 9 pillars RCC construction of size 200mm X 200mm X 750mm high with MS plate embedded on top
- Rainfall Hyetograph design based on rainfall data (observed storm event) or IDF relationship which provide 2, 5, 20, 50-year return periods. Based on the recorded rainfall data, estimating return period for 2,5,10,20,50 & 100 years.
- Establishing planimetric control points using Differential Global Positioning System (DGPS) and collection of all topographical details.
- The study covers adjoining areas also to understand the flow patterns / flood effects from the nearby catchment areas.
- Rainfall-runoff data modelled for hydrologic analysis.
Meteorological Study under ASHRAE standards
- a) Meteorological study findings include:
- Ambient temperature (min, avg, max)
- Ambient relative humidity (avg. min)
- Ambient pressure, water vapour partial pressure
- Saturation point (avg, max) for the last 38 years
- Duration of sunshine (hr.) for the last 19 years
- The monthly Wind rose diagram, average and max wind speed for last 38 years;
- Amount of days of each atmospheric phenomena for the last 19 years; total annual amount of precipitation (mm)
- Annual max height of snow cover for the last 38 years
- b) Design points will be including following parameters and the relative humidity based on 25 and 50 years of return period according ASHRAE 2017 guideline:
- Design summer dry bulb temperature (DBT), °C
- Design summer mean coincident wet bulb temperature (WBT), °C
- Design winter dry bulb temperature (DBT), °C
- Design winter mean coincident wet bulb temperature (WBT), °C Design shoulder dry bulb temperature (DBT), °C
- Design shoulder mean coincident wet bulb temperature (WBT), °C Absolute max, dry bulb temperature (DBT), °C
- Absolute min, dry bulb temperature (DBT), °C
- Average monthly max. dry bulb
- Average monthly min. dry bulb
- HVAC summer design condition, dry bulb temperature (DBT), °C HVAC summer design condition, mean coincident wet bulb temperature (MCWBT) °C
- HVAC winter design condition, dry bulb temperature (DBT), °C.
Water Supply Study
- Water resources data collection
- Assessment different water sources and analysing water availability in the survey site;
- Upstream and downstream status quo in the survey site;
- Physical and chemical parameters of the water sources and preliminary water quality assessment
- High level hydraulic and hydrological assessment