The purpose of this method is to describe the methodology involved in construction work for the CW Intake Pump station item and to detail out the steps to be taken in order to meet the technical requirements of VP1 BOT Thermal Power Plant
Comment Response Sheet (CRS) Project Title Van Phong BOT Thermal Power Plant Project Document Title METHOD STATEMENT FOR CONSTRUCTION OF CW INTAKE PUMP STATION Document Type For Approval Document No VP1-0-L4-C-UPC-10048 Returned Status NA Prepared by CRS No VP1-0-L4-C-UPC-10048-B-CRS CRS Issued Date 16/06/2020 Engineer Construction Review Date Status O/C * Remarks 25/05/2020 O 16/06/2020 C No Section/ Page 3 Owner’s Comment Response to Comment The following MS is very rough and poor contents from considering the huge size of structure and Deepest excavation DHI should review & check sufficiently before submission of MS Noted DHI updated on Rev.B Include the attachments in the main file rather than attached files DHI listed separately to provide more detail and specific information 25/05/2020 O 16/06/2020 C 25/05/2020 (1) temperature control: numbering the thermocouples and monitor the temperature in principle that first casting first monitoring (2) Regarding concrete volume of pump house foundation greater than 1000m3, calculation of pump trucks before casting should be attached (3) Construction time schedule to be attached for information (4) Access path in emergency case should be considered due to deep foundation posing high risk on safety 25/06/2020 25/05/2020 O (1) There are thermocouples which are arranged with numbering monitor the temperature easier (section 6.5.7) 16/06/2020 O Lot (2) Calculation of concrete supply is attached as Attachment #4 (3) Construction schedule is attached as Attachment #7 (4) Noted, access ways will be prepared at sides of foundation Page of 11 Comment Response Sheet (CRS) 10 11 12 4 5 8 Outline of Structure and Works > Size of structure > Depth of Excavation and Volume > Total Concrete Volume and so on DHI updated on Rev.B 25/05/2020 O 16/06/2020 C Why there is no HSE procedures such as lifting procedure, scaffolding management procedure, mobile plant operation, etc? DHI updated on Rev.B 25/05/2020 O 16/06/2020 C Plan & Sections which show size of structure and thickness of all members These drawings should be shown DHI updated on Rev.B 25/05/2020 O 16/06/2020 C Are there any design for the foundation of the tower crane? Tower Crane Foundation design is attached as Attachment #6 25/05/2020 O 16/06/2020 C Capacity of pump and calculation of dewatering system should be provided The calculation sheet for dewatering system is attached as Attachment #3 25/05/2020 O 16/06/2020 C The bottom of base slab is 11m under ground water Dewatering system is big issue and should be stated and calculation needed The calculation sheet for dewatering system is attached as Attachment #3 25/05/2020 O 16/06/2020 C There is no berm on this slope Slope stability check needed It is part of CW Intake Canal And slope stability of this area will be checked on “CW Intake Canal Drawing” 25/05/2020 O 16/06/2020 C How much degree of this access way ? There are access ways as “6.1 Excavation” 25/05/2020 O 16/06/2020 C 25/05/2020 O 16/06/2020 C The slopes and the fence along the access way are different from other drawings in this document Use only one (correct) plan DHI updated on Rev.B Page of 11 Comment Response Sheet (CRS) 13 14 15 9 Actual GWL may be EL +0.6~1m, and then dewatering method and detail should be stated for completely drying up at the bottom of excavation before lean concrete Especially calculation of de-watering shall be needed Excavation should be considered of heavy rain At another project, all construction equipments were under water by night time rain DHI will carry out dewatering after meet underground water during Pre-Excavation up to EL+0.0m Volume of excavation at each step should be shown including access way DHI updated on Rev.B 25/05/2020 Please describe disposal area for this excavation quantity? Excavated soil will be transported based on site condition, used for landfill work 25/05/2020 O 16/06/2020 C 25/05/2020 O 16/06/2020 C 25/05/2020 O 16/06/2020 C The calculation sheet for dewatering system is attached as Attachment #3 16/06/2020 Closed Excavated soil shall be handle by EPC within site, disposal outside is not acceptable so far 16 25/05/2020 This width maybe too narrow for dewatering method of GWL and disposal of heavy rain during pouring concrete of base slab 16/06/2020 Closed Mean concreting work will not be allowed in bad weather Closed DHI updated on Rev.B following “VP1-0-L4-CUPC-10501 CW INTAKE PUMP STATION, EXCAVATION DRAWING” Before casting concrete, DHI will check weather forecast to prevent heavy rain during concrete work The concreting work should avoid the rainy day 25/05/2020 O 16/06/2020 C Closed Page of 11 Comment Response Sheet (CRS) 17 18 9 Please provide where is section A, section C on the plan drawing? DHI updated on Rev.B 25/05/2020 O 16/06/2020 C 25/05/2020 Address dewatering of the excavation pit Consider water inflow from ground water and rain surface water The calculation sheet for dewatering system is attached as Attachment #3 DHI also updated the Attachment #3 25/05/2020 O 16/06/2020 C Thickness of Lean Con’c shall be followed Construction Drawing 25/05/2020 O 16/06/2020 O 16/06/2020 Closed This item is closed, but additional comments on the topic are made in the report 19 10 25/05/2020 For wide area (32m x 44m) thickness of lean concrete 50mm is too thin, because tolerance of excavation should be less than ± 20mm and the thickness of base slab may be 2m.Ðean concrete should have enough strength for reinforcement and form work 16/06/2020 OPEN If lean concrete thickness follow construction drawing, please delete 50mm on page Further more, lean concrete shall be strong enough to bear the load of rebar case and weight enough to avoid the push up of GWL after dewatering Minimum 10cm is recommended 20 10 The direction of this slope does not match the 3D view and does not seem correct 25/06/2020 DHI has updated on MS rev C and DHI will comply with construction drawing and project specification DHI updated on Rev.B Closed 25/05/2020 O 16/06/2020 C Page of 11 Comment Response Sheet (CRS) 21 22 23 24 25 26 27 28 29 11 13 13 13 13 13 14 14 15 Please describe interface with Lot-3 where has CW pipe? DHI updated on Rev.B 25/05/2020 O The detail and describe interface with Lot-3 is added following Drawing 16/06/2020 C - How much volume of concrete ? How long for pouring concrete by concrete pump trucks ? - The detail method of pouring concrete should be stated in considering with rainy season The volume of base slab is 1839m3, and it will take around 16 hours to cast concrete 25/05/2020 O 16/06/2020 C The construction equipment and storage area are very close to the edge of the slope Confirm that this has been considered in the stability calculations The equipment and storage area will be arranged at least 2m, away from the edge of slope to prevent slope collapsing 25/05/2020 O 16/06/2020 C Formwork frame is different with the description in next page (14) Attached calculation is not provided for this frame DHI updated on Rev.B and Attachment #1 25/05/2020 O 16/06/2020 C The lengths of the support members not match the excavation dimenesions DHI updated on Rev.B 25/05/2020 O 16/06/2020 C This slope does not match the excavation slopes DHI updated on Rev.B 25/05/2020 O 16/06/2020 C DHI updated on Rev.B and it is calculated with considering safety factor 25/05/2020 O 16/06/2020 C Concrete volume for each stage of wall should be shown The concrete volume of each stage is attached as Appendix #7 25/05/2020 O 16/06/2020 C Is it correct with attached calculation? It is calculated with considering safety factor 25/05/2020 O 16/06/2020 C Is it correct with attached calculation? The calculation of casting massive concrete is attached as Attachment #4 Page of 11 Comment Response Sheet (CRS) 30 15 No calculation for this DHI updated on Rev.B and it is calculated with considering safety factor 25/05/2020 O 16/06/2020 C 25/05/2020 O Before casting concrete, DHI will check weather forecast to prevent heavy rain during concrete work The concreting work should avoid the rainy day 16/06/2020 C The calculation sheet for support system is attached as Attachment #1 25/05/2020 O 16/06/2020 C The volume of concrete is 788m3 31 16 25/05/2020 How much volume of concrete for top slab ? How prevent pouring concrete of slab from rain ? 16/06/2020 Closed Mean concreting work will not be allowed in bad weather 32 16 25/05/2020 - Design/calculation for support is necessary, please provide properly - Load test for testing bearing capacity and deflection of scaffolding is recommended Closed 16/06/2020 Noted, Calculation of support is attached as appendix However, the reply in CRS is not correct 33 17 What construction method is applied for this slab ? Closed DHI updated on Rev.B 25/05/2020 O DHI will backfill up to EL -0.7m and carry out bottom concrete 16/06/2020 C Page of 11 Comment Response Sheet (CRS) 34 35 18 20 For base slab (32m x 43m), plastic sheet is not enough for sudden rain Temporary tent is recommended and can be continue pouring concrete at rain If temporary tent used for base slab, heavy rain on Tent should be gathered and dewatered by enough pumps If heavy rain flow into fresh concrete, all poured concrete shall be removed DHI updated on Rev.B 25/05/2020 O 16/06/2020 C General comment: (i) Mass concrete center temperature shell not exceed 70 oC as required in Technical specification (ii) Mock-up for massive concrete is required (iii) Temperature calculation for massive concrete is required to submit (i) The monitoring of temperature will be carried out by the thermocouple 25/05/2020 O 16/06/2020 C The method of repair concrete surface and applied Bituminous Waterproofing is submitted separately, “VP1-0-L4-C-GEN-10027 METHOD STATEMENT FOR WATER PROOFING OF UNDERGROUND CONCRETE STRUCTURES” 25/05/2020 O 16/06/2020 C K=95% is required for compaction density following “VP1-0-L4-C-UPC-10501 CW INTAKE PUMP STATION, EXCAVATION DRAWING” 25/05/2020 O 16/06/2020 C (ii) The Mock-up of massive concrete has been conducted with Pre-Cast Concrete for Temporary Unloading Ramp and result was submitted “VP10-L4-Q-GEN-10047 Proposal of Concrete Mix Proportion for Mass Concrete” (iii) DHI updated on Rev.C This information will be submitted via ‘VP1-0-L4-Q-GEN-10047 Proposal of concrete mix for mass concrete (Rev.B) 36 37 20 21 Bituminous painting also stated in this section Compaction density should be stated Page of 11 Comment Response Sheet (CRS) 38 39 21 21 Backfilling for another section should be shown During backfilling, buoyancy check by GWL should be stated DHI updated backfilling section on Rev.B 25/05/2020 O Buoyancy during construction period is considered “VP1-0-L4-C-UPC-10001 CW Intake Pump Station Calculation” 16/06/2020 C 25/05/2020 Please prepare the risk assessment "RA" and job safety analysis "JSA" in response to EPC risk assessment procedure and Vietnamese regulation RA and JSA should be submitted pertaining to Method statement The RA and JSA should be prepared based on the procedure and sequence section in this document cum tower crane installation it is submitted pertaining to 25/06/2020 25/05/2020 O DHI has updated on MS rev C (see attachment 6) 16/06/2020 O OPEN There is only risk assessment for tower crane Doosan risk assessment procedure said that a risk assessment which cover all the task mentioned in this method statement shall be prepared based on sequence of construction work and the JSA is only prepared for the residual risk higher than It seem no Doosan HSSE team's review on this document 16/06/2020 OPEN There is only JSA for tower crane installation, what about risk assessment to cover all the task, JSA for high residual risk based on Doosan risk assessment procedure? 40 41 16/06/2020 QC engineers included ? 25/06/2020 16/06/2020 Periodical monitoring of stability of slope and seepage of GW should be executed 25/06/2020 16/06/2020 Closed O 16/06/2020 Closed O DHI has revised and updated on MS rev C (section 3) DHI has revised and updated on MS rev C (section 6.1) Page of 11 Comment Response Sheet (CRS) 42 43 44 45 46 10 10 21 26 #Attachment Page 1/3 47 #Attachment Page 1/3 48 #Attachment Page 1/3 16/06/2020 Is this access way for only 1st excavation? 25/06/2020 16/06/2020 This slope and stability check will be stated at work of Intake canal 25/06/2020 16/06/2020 From the construction schedule, pouring concrete of base slab will be just in rainy season Is this plastic cover over the full size of base slab ( 45m x 30m) ? 25/06/2020 16/06/2020 This is also Rev B ? 25/06/2020 16/06/2020 Show the location with actual size on the excavation plan 25/06/2020 16/06/2020 This is not possible at the bottom of the pit with the current layout 25/06/2020 16/06/2020 Where is this taken from? 25/06/2020 16/06/2020 Closed O 16/06/2020 Closed O 16/06/2020 Closed O 16/06/2020 Closed O 16/06/2020 O No, 1st excavation mean level of this access way is same with level of 1st excavation layer Yes, this slope and stability check will be stated at work of Intake canal Yes, material will be prepared full size of structure Yes, it was rev B also DHI has revised and updated on Rev.C(section 6) Closed 16/06/2020 Closed DHI has deleted this information and updated on Rev.C (attachment 4) Refer to soil investigation report, take from borehole BH42, calculate the amount of water that penetrates to the foundation pit with high water level: +0.07m O 16/06/2020 O Closed Page of 11 Comment Response Sheet (CRS) 49 #Attachment Page 2/3 50 #Attachment Page 3/3 51 #Attachment Page 3/3 52 #Attachment 16/06/2020 Heavy rainfall and inflow from ramp and surrounding areas (within the protection dike) need to be considered 25/06/2020 16/06/2020 This drawing does not match what is described poages earlier 25/06/2020 16/06/2020 Predicted GWL after dewatering at pump sump.Út center, GWL should be lowered to 0.5m under excavated bottom 25/06/2020 How is this base of tower crane disposed 25/06/2020 completion of CW Pump Station ? 53 #Attachment Page 16/06/2020 Indicate which code is used and show clear reference for the formulaes 16/06/2020 O Closed Noted, the calculation is included the rainfall from surrounding areas 16/06/2020 O Closed DHI has revised and updated on Rev.C(attachment 4) 16/06/2020 Closed O 16/06/2020 Closed O 16/06/2020 O Noted, the pump will be operated regularly to ensure GWL should be lowered to 0.5m under excavated bottom We design it become part of intake canal structure, intake canal yard is designed by rubble stone concrete 25/06/2020 DHI has deleted this attachment Relation work will be combined with section 6.5.6 and document “VP1-0-L4-Q-GEN-10047 Prop of Concrete Mix Proportion Mass Concrete “ which will be submitted in separately Closed Page 10 of 11 CHECK BOLTS (NONE-WORKING CASE) Based on standard: - TCVN 5575-2012: Steel structures – Design standard Input parameters of bolts Diamerter of bolts F= 40 mm Calculated cross-sectional area of the bolt body A= 1257 (mm2) Abn = 956 (mm2) Actual cross-sectional area of the bolt body Grade of bolts 8.8 Tensile strength of bolts ftb = 400 (N/mm2) Resistance of bolts [N]tb= 382.4 kN Check bolts Moment: M= 1770 kNm Longitudinal force: N= 390 kN Check on resistance of bolts Row Li Li2 Ni (mm) (mm) (mm2) (kN) 0 -97.5 2000 2000 4000000 345.00 S Li2 = 4000000 Nmax = Quantity of bolts Tensile force on bolst Conclusion piece 43.1 kN OK Page 345.0 CHECK SETTLEMENT OF TOWER CRANE IN WORKING CASE NO hi (m) Depth (m) бgl(tb) (T/m2) Si (cm) 0 0.98 4.27 0.024 Continue 3.88 0.90 4.05 0.023 Continue 1.00 3.38 0.78 3.63 0.020 Continue 7120 1.33 2.89 0.67 3.14 0.018 Continue 5.00 7120 1.67 2.62 0.61 2.75 0.015 Continue 2.00 6.00 7120 2.00 2.26 0.52 2.44 0.014 Continue 3.5 2.00 7.00 7120 2.33 1.92 0.45 2.09 0.012 Continue 5.0 4.0 2.00 8.00 7120 2.67 1.73 0.40 1.82 0.010 Continue 0.5 5.5 4.5 2.00 9.00 7120 3.00 1.57 0.36 1.65 0.009 Continue 10 0.5 6.0 5.0 2.00 10.00 7120 3.33 1.42 0.33 1.50 0.008 Continue 11 0.5 6.5 5.5 2.00 11.00 7120 3.67 1.31 0.30 1.37 0.008 Continue 12 0.5 7.0 6.0 2.00 12.00 7120 4.00 1.23 0.29 1.27 0.007 Continue 13 0.5 7.5 6.5 2.00 13.00 7120 4.33 1.18 0.27 1.20 0.007 Finish 14 0.5 8.0 7.0 2.00 14.00 7120 4.67 0.22 0.05 0.70 0.004 Finish 15 0.5 8.5 7.5 2.00 15.00 7120 5.00 0.19 0.04 0.20 0.001 Finish Z Eo gi (T/m2) S(gixhi) (m) (T/m2) z/b бgl=pgl*ko (T/m2) ko 1.0 0.0 2.00 0.00 7120 0.00 4.32 1.00 0.5 1.5 0.5 2.00 1.00 7120 0.33 4.22 0.5 2.0 1.0 2.00 2.00 7120 0.67 0.5 2.5 1.5 2.00 3.00 7120 0.5 3.0 2.0 2.00 4.00 0.5 3.5 2.5 2.00 0.5 4.0 3.0 0.5 4.5 0.5 0.18 Total of Settlement S < [S] = 8cm Settlement of Soil under Foudation Calculation follow: TCVN 9362-2012 S = (0.8/E0).S(dgltb.hi) Which: E0 – Modul Settlement of Soil (According to Tassios, Anagnostopoulos) E0 = [a + c*(N + 6)]/10 MPa Where: a - Coefficient, a=40 if N>15 and a=0 if N6 for this activity therefore a Job Safety and Environmental Analysis (JSEA) will be conducted as attachment of PTW required Project : Van Phong Thermal Power Plant PROJECT RISK ASSESSMENT Job / Task People at Risk Cause of Adverse Effect Adverse Effect L1 S1 RFN ** Control Measures [ Environment, Social & Health ] - Unauthorized access of public to electrical network due to lack of awareness and lack of control [ ES&H ] - Fatality or serious personal injury - Damage to property/system [ Environment, Social & Health ] - Lock Out Tag Out system implemented - All temporary electrical netwroks shall be inaccessable for pubulic - Only authorized personnel with valid Permit to Work allowed to access the electrical networks - All distribution panel boards are locked and only authorized person can open the panel boards - Hard barricade installed on the panel boards with warning signs [ Safety ] - Falls (people & materials) - Collapse - Struck by plant - Fumes, lack of oxygen - Entrapment - Proximity of stored materials, waste materials or plant falling into excavation - Contact with underground services - Unsuitable access & egress [ Safety ] - Fatality - Serious personal injury - Injuries to third parties - Damaged temnporary / permanent cables [ Safety ] - Prepare Permit to Work for every excavation activity of 1,2m of deeper Classificating of underground structure and make plan to handling properly - Supervision of work by competent person - Adequate shoring (sloping with proper angle / benching) and battering of excavation to prevent collapse - Edge protection installed around excavation if needed - Safe access and egress to the bottom pit - All materials stored at least 2m away from excavation edge - Air monitoring inside excavation to ensure no hazardous fumes present for confined space holes - Influx of sea water or underground water controlled by the use of pumps - For vehicles tipping materials into excavation, stop blocks should be used at all times, banksman should be available - All vehicle movements controlled by a banksman - Adequate lighting installed - PPE must be worn at all times - Proper access to be provided with steps and railings - Heavy equipment must stay at a safe distance as per site instruct and ehs requirement from the edge of excavation - Hard barricade with signages installed around the excavation - Good quality of as-built drawing with detailed underground facilities attached to the PTW - Copy of approved PTW with drawing MUST be with the excavating crew at all time L2 S2 RRN * Assessment Part III - Construct of Tower carane Foundation Work in Excavations Site personnel, Subcontractors & Others [ Environment, Social & Health ] - Dust emission into air - Genearation of noise - Open excavations without barricades - Fire and Explosion -Oil leak [ ES&H ] - Effect on people health due to dust emission into air - Effect of people health due to excessibe noise of equipment - Public encountered with open excavations could cause serious injuries 12 [ Environment, Social & Health ] - Control of dust emissions through regular water spray - Restricting high noise equipments entering to site - Inspection of all equipments before entering to site - Provision of hard barricades and clear warning signs - Provide spill kit/ oil leak kit and store at each equipment to reduce and handling oileak case Page JSEA should be prepared and submit pertaining to this document based EPC procedure 3 Control measures will be regularly reviewed and monitored to assess their suitability and improvements made if required If any change is made to the working condition or operation i.e change in sequencing, new plant/equipment or new workers involved, a new risk assessment will be conducted and further control measures implemented to suit the operation Project : Van Phong Thermal Power Plant PROJECT RISK ASSESSMENT Job / Task People at Risk Cause of Adverse Effect [ Safety ] - Collision with moving vehicles - Slips, trips and falls - Struck by moving, falling or flying objects - Falls from working at height Access / Egress / Work Platform Adverse Effect S1 RFN ** [ Safety ] - Fatality - Serious personnel injury Site personnel /Public /Subcontractors Site personnel, Fabricating and Installation of rebar, Subcontractors & form frame formwork Others L1 12 Control Measures [ Safety ] - Installation of designated pedestrian walkways to segregate from vehicles and work operations - Good housekeeping, keeping access/egress routes clear of obstructions and trips/slips/falls hazards - Regular housekeeping inspections shall be undertaken - Stairways shall be of adequate width and depth with handrails installed either side for access/ egress to workarea - Segregation of vehicle routes, unloading/loading areas material storage areas shall be installed on site - All vehicle reversing shall be controlled by a banksman and audible devices - Adequate lighting shall be installed on all walkways - Signage shall be used on acess / egress route - PPE to be worn at all times - Scaffolding structure shall erect as work platform if in need with its fullfill requeiment and scaf tag - Any work on scaffolding platform with iron material below or near the edge / out of hard barricade fence must use the body hardness - Free from obstales on the movement path and work plaform [ Environment, Social & Health ] - Over speeding of vehicles in public areas [ ES&H ] - Social conflicts [ Environment, Social & Health ] - Awareness to the drivers - Control of speed limits - Information to community regarding heavy traffic movement - Random checking by security of vehicle speed using speed gun - Installation of additional speed limit and stop signage on roads [ Safety ] - Falls - Electric shock - Cut - Fire - Fragments flying - Caught in between, - Slip, strip , fall - Poor manual lifting - Dropping of a load - Lifting sharp edged or hot loads [ Safety ] - Fatality - Serious personnel injury - Injuries to third parties - Burns [ Safety ] - Electrical equipment register containing all electrical equipment on site as well as relevant documentation - Temporary power supply, portable electrical tools, cables will be tested and inspected every three months by competent persons, and tagged to certifying it is safe for use - All defective items reported immediately, if defect renders equipment unsafe to use it will be removed from site until repaired - Double insulated cables to be used on hand held tools - All cable routes shall be designated so that to not obstructed access/egress walkways - PPE must be worn at all times - Use of industrial plug 44 for all power tools at site - Safeguard devices, protection devices/ parts off the power tools not allow to remove Hand-made power tool is prohibited - Cuting , welding area be covered and isolated to to prevent sparks, fragment flying - fabricating machine must have earth connection to prevent electricshock - Any work relate to hot work must have Permit and fullfill its requirement of PPE and fire extinguisher - House keeping properly - Rotation parts of machine must have cover / guar protection part and not allow to release - machinery Lifting must fullfill its Green Card and Lifting work requirement - Manual lifting with right postuge Limited of bent down act when lifting - Do not let hand/ finger/ foot at pin point position - Dp not stand under suspend load Page 16 L2 S2 RRN * Assessment Control measures will be regularly reviewed and monitored to assess their suitability and improvements made if required If any change is made to the working condition or operation i.e change in sequencing, new plant/equipment or new workers involved, a new risk assessment will be conducted and further control measures implemented to suit the operation JSEA should be prepared and submit pertaining to this document based EPC procedure 3 Control measures will be regularly reviewed and monitored to assess their suitability and improvements made if required If any change is made to the working condition or operation i.e change in sequencing, new plant/equipment or new workers involved, a new risk assessment will be conducted and further control measures implemented to suit the operation RRN >6 for this activity therefore a Job Safety and Environmental Analysis (JSEA) will be attached as per PTW required Project : Van Phong Thermal Power Plant PROJECT RISK ASSESSMENT Job / Task Concrete activity People at Risk Cause of Adverse Effect Adverse Effect L1 S1 RFN ** Control Measures [ Environment, Social & Health ] - Generation of noise and vibration - Generation of hazardous dust from wood saw and concrete grinding [ ES&H ] - Effect on health due to noise and vibration - Effect on health due to hazardous dust emission into air [ Environment, Social & Health ] - Control of noise and vibration through inspection of tools and equipment before entering to site - Segregation of wood cutting area from other activities - Control of concrete dust by using dust suckers - Use of appropriate PPE (ear plug respiratory protection) [ Safety ] - Contact with concrrete materials entering the body, eyes through o exposed skin o Absorption o Inhalation - Slip, strip Falling during executing - Long time working with big volume concrete pouring [ Safety ] - health - Cancel - Lung ache - fatigue [ Safety ] - Movement of concrete mixer , concrete pump vehicle must have planed Place area condition for the pump vehicle must be checked thoughtout before setting up Isolated vehicle stand / movement area Signaman / watcher be place to guide the reversing vehicle , mixer - Pump piipe hollder must wear coverall clother with faceshield to avoid splash concrete to the body or eyes Other partner must wear proper PPE with a lessen skin exposing purpose - Safety boots for concrete activty - Role type working Set proper working shift ( rountine ) for each team to prevend fatigue due to long time working - Wash hand, clean face and mouth before drink or eating during breaktime - Light providing proper for night work - Surveyor must check frequently of installed footage's anchor bolt before and after pouring concrete to make sure the foot point not be lean or fail during concrete activity - Cure Concrete Tower crane foundaton untill its reach the time required No other activity of the next installation phase to the foundation is allowed during this period Site personnel, Subcontractors & Others [ Environment, Social & Health ] - Concrete waste disposal unproperly - [ ES&H ] -Environmental incident - Natural affect / absorb 15 [ Environment, Social & Health ] - concrete waste must be disposal at designated area Page L2 S2 RRN * Assessment Control measures will be regularly reviewed and monitored to assess their suitability and improvements made if required If any change is made to the working condition or operation i.e change in sequencing, new plant/equipment or new workers involved, a new risk assessment will be conducted and further control measures implemented to suit the operation Project : Van Phong Thermal Power Plant PROJECT RISK ASSESSMENT Job / Task People at Risk Cause of Adverse Effect Adverse Effect L1 S1 RFN ** Control Measures L2 S2 RRN * Assessment Control measures will be regularly reviewed and monitored to assess their suitability and improvements made if required If any change is made to the working condition or operation i.e change in sequencing, new plant/equipment or new workers involved, a new risk assessment will be conducted and further control measures implemented to suit the operation Part IV- Mobilization and Erection Tower Crane [ Safety ] - Falls (people & materials) - Collision with vehicles and pedestrians due to lack of knowledge and awareness of traffic routes - Uncontrolled lifting operations - No banks man - Not wearing the appropriate PPE when on site - Bad vehicle technical quality status - Fail to follow Lifting procedures All delivery vehicles (& drivers) travelling to, from or around Mobilization of TowerCrane Parts site/ Site personnel/ Subcontractors Assemblying crane parts on the Site personnel, ground and Erection ( Leg / Body Subcontractors & / Cabinet and boom / Counter Others weights …) Operations [ Safety ] - Serious personnel injury - Struck by materials - Overturning of vehicle when unloading - Collision - working accident - Traffic accident [ Environment, Social & Health ] - Use of public roads- Dust emissions into the air - Generation of noise - Soil contamination from vehicle/plant and equipment [ ES & H ] - Effect on public health due to noise and dust - Ground contamination due to oil spillage or leakage from plant /equipment & vehicles - Traffic congestion on public roadsEffect on adjacent buildings and residents - Effect on local road conditions - Effect on public health due to dust and noise - Ground contamination due to oil spillage or leakage from plant /equipment & vehicles [ Safety ] - Falling objects and materials - Crushing - Collisions between people and plant - Lifting support not get full safe condition of area / ground postion, equipment and lifting gear, - Lifting not free from its operation or co-work - Jib, Boom, Leg break down or loosed [ Safety ] - Fatality - Serious personal injury - Injuries to third parties Page 16 [ Safety ] - Any material enter to site must be declared and inform to the Consortium/ DHI to be approved before enter the site Specific materials such as scaffolding material, electrical material… will be inspect at the entrance before enter the site - Supervisor must planing of transport route and prepare proper stcck area for tower crane parts ,; not be obstaled and easy to assembly - Material be stockpiled tidily and segerated with kind of material Secure, Isolate, label and signboard be set at stock area / storage container - Lifting must follow lift procedure with it proper lifting gear in good condition and execute by comprehent crews Regulation 3-3-3 - Heavy load over 10 ton must have permit ot work - Lifting / assemblying area must be secure and isolated - No other work allow under lifting range - No person allow under suspend load [ Environment, Social & Health ] - Managing traffic of the project considering the rush hours on public roads - Control of dust through regular water spray on roads - Inspection of plant and vehicles before entering to the site - Sheet all vehicles carrying bulk materials into and out of the site to prevent dust dispersal during transit Including transport of bulk materials inside the site - Control of dust through regular water spray on roads - Noise monitoring for plant & equipment, restricting the high noise equipment entering to site - Inspection of all plant/equipment and vehicles before entering to site to check for any possible oil spill or leakage - Sheet all vehicles carrying bulk materials into and out of the site to prevent dust dispersal during transit Including transport of bulk materials inside the site - Regularly spray water on stripped topsoil to minimize dispersion on dust - Secondary containment system will have a capacity of not less than 110% of the container’s storage capacity [ Safety ] - Permit to Work - Segregation of working area while lifting in progress - Only competent authorized persons with the relevant certificates and license, to operate machinery and conduct lifting operations - All lifting operations to have a banksman at all times - Warning signage displayed notifying of lifting operations - Regular inspections and maintenance of equipment undertaken by competent persons - Lifting plan to be developed and distributed to relevant parties - PPE shall be worn at all times - Full implementation 333 for Safety for lifting operation: - No person shall be on the load during lifting operation - When assemblying erecting tower cranes, it is advisable to restrict the construction of other works in the area of crane operating radius or erection at the time of construction interruption - Check carefully each joint / connect bolts to make sure it fully conecting and tighness properly from the leg to body to jib booms and other parts - No bdy under supensed load when operation - Bodyhardness is require for any work higher than 1.8m - Surveyor must check frequently to make sure the leg / body installing vertical is under the technical requirement - In case of co-op lift , loud speaker and one lead guider be required 2 JSEA should be prepared and submit pertaining to this document based EPC procedure 3 Control measures will be regularly reviewed and monitored to assess their suitability and improvements made if required If any change is made to the working condition or operation i.e change in sequencing, new plant/equipment or new workers involved, a new risk assessment will be conducted and further control measures implemented to suit the operation RRN >6 for this activity therefore a Job Safety and Environmental Analysis (JSEA) shall be conducted Project : Van Phong Thermal Power Plant PROJECT RISK ASSESSMENT Job / Task People at Risk Cause of Adverse Effect Adverse Effect L1 S1 RFN ** Control Measures [ Environment, Social & Health ] - Uncontrolled access - Unauthorized operator - Oil spill/leakage [ ES&H ] - Exposure of unauthorized person to site - Equipment operation by unauthorized operators - Soil contamination [ Environment, Social & Health ] - Restrict the entry of unauthorized person to site - Operators identity shall be displayed on the equipment - Inspection of all equipment before entering to site - Provision of secondary containment for all stationery equipment [ Safety ] - Incomprehent operator / operation crew - Crushing - Collisions between people and plant - Lifting support not get full safe condition of area / ground postion, equipment and lifting gear, - Lifting not free from its operation or co-work - Jib, Boom, Leg break down or loosed - Falling of operator [ Safety ] - Fatality - Serious personal injury - Injuries to third parties [ Safety ] - Only competent authorized persons with the relevant certificates and license, to operate machinery and conduct lifting operations - All lifting operations to have a banksman at all times Communicating with walky-talky - Free people / vehicle working from lifting area - Full implementation 333 for Safety for lifting operation: - No person shall be on the load during lifting operation - Checking for signs of mechanical damage to slings, straps, chains, hooks, etc before using Recording diary - All lifting equipment being used has the capacity to carry the load being lifted if no reliable information is available as to the weight of the load Check and ensure overload warning device is attached to the tower crane according catolog - Any load pass though powerline system must be consider and planing to its safety - Any lift pass though the transport route must have traffic controller to stop the transport untill lifting operate done - Loads must not be stuck Pulling lift is not allows - Provide walkie talkie for lifting operation of tower crane - Not Leave the hook to low while traveling - Make sure cuise control of carane operate normally - Use tagline to direction the load - Load must lift to a required height before traveling - Pulling lift is not allow - Full time supervison for tower crane operation is reuired Stop if - Operating cabinet must be close alltime during using - Fall arester must be installed on the lader to the operating cabinet L2 S2 RRN * Assessment Part IV- Operation Tower Crane Operation Site personnel, Subcontractors & Others [ Environment, Social & Health ] - Uncontrolled access - Unauthorized operator - Oil spill/leakage [ ES&H ] - Exposure of unauthorized person to site - Equipment operation by unauthorized operators - Soil contamination 16 [ Environment, Social & Health ] - Restrict the entry of unauthorized person to site - Operators identity shall be displayed on the equipment - Inspection of all equipment before entering to site - Provision of secondary containment for all stationery equipment Part V- Health and Emmergency Page JSEA should be prepared and submit pertaining to this document based EPC procedure 3 Control measures will be regularly reviewed and monitored to assess their suitability and improvements made if required If any change is made to the working condition or operation i.e change in sequencing, new plant/equipment or new workers involved, a new risk assessment will be conducted and further control measures implemented to suit the operation RRN >6 for this activity therefore a Job Safety and Environmental Analysis (JSEA) shall be conducted Project : Van Phong Thermal Power Plant PROJECT RISK ASSESSMENT Job / Task People at Risk Cause of Adverse Effect [ Safety ] - Overexposure or overexertion in excessive working environmental conditions - Work performed at elevated temperatures and high relative humidity - Wearing of clothing that inhibits the body’s ability to cool itself Heat Stress Housekeeping Disarter Emmergency Plan Prepared By: Site personnel, Subcontractors & Others Site personnel, Subcontractors & Others Site personnel, Subcontractors & Others Adverse Effect L1 S1 Control Measures RFN ** [ Safety ] - Heat Stroke; Confusion, irrational behavior, convulsions, coma and death - Heat Exhaustion; Headache, vomiting, dizziness, weak pulse - Heat Rash; Build up of rash covering parts of the body - Heat Cramps; Muscle spasms i.e abdomen and extremities 12 [ ES&H ] - Unrest in workers - Social conflicts [ Environment, Social & Health ] - Suitable and sufficient welfare facilities on site, include shelter from sun, drinking facilities (clean and suitable drinking water, monitored and refilled throughout the day), hand wash and toilet - Ambulance shall remain on standby - Regular health surveillance and medical surveillance undertaken on workforce - Increase in awareness of workers [ Safety ] - Slips, trips and falls - Falling of materials and objects - Fire [ Safety ] - Fatality - Personal injury - First aid injuries [ Safety ] - Clear unobstructed walkways - Clear and safe access and egress - Effective material storage in segregated areas - Regular monitoring of work areas - Unwanted materials remove from site immediately [ Environment, Social & Health ] - Generation of diseases - Contamination of land [ ES&H ] - Effect on people health - Land contamination - Water pollution - Social conflicts in shape of community complaints [ Safety ] - Broken / Falling [ Safety ] - Fatality - Personal injury - First aid injuries Doosan Heavy Industries & Constructions / EHS Dept EHS General Manager Position: [ ES&H ] - 12 [ Environment, Social & Health ] - Effective waste management (waste bins provided around site and skips segregated, with waste disposed of by an approved licensed contractor) - Monitoring of waste collection contractor and ensuring the dumping in licensed area Signature: Date: 12 Jul 2019 12 [ Environment, Social & Health ] Approved By : Doosan Heavy Industries & Constructions / Site Management Position : Site Manager Severity Risk Factor Number (RFN) Residual Risk Number (RRN) 1: 2: 3: 4: 5: 1: 2: 3: 4: 5: - Trivial/Acceptable - Tolerable - Moderate/Acceptable with review 10 -15 Substantial 16 - 25 Intolerable/Unacceptable 1-2: Trivial/Acceptable 3-5: Tolerable 6-9: Moderate/Acceptable with Review 10-15: Substantial 16-25: Intolerable/Unacceptable Negligible Slight Moderate Critical/High Catastrophic/Very High RRN * Assessment Control measures will be regularly reviewed and monitored to assess their suitability and improvements made if required If any change is made to the working condition or operation i.e change in sequencing, new plant/equipment or new workers involved, a new risk assessment will be conducted and further control measures implemented to suit the operation Control measures will be regularly reviewed and monitored to assess their suitability and improvements made if required If any change is made to the working condition or operation i.e change in sequencing, new plant/equipment or new workers involved, a new risk assessment will be conducted and further control measures implemented to suit the operation Control measures will be regularly reviewed and monitored to assess their suitability and improvements made if required If any change is made to the working condition or operation i.e change in sequencing, new plant/equipment or new workers involved, a new risk assessment will be conducted and further control measures implemented to suit the operation [ Safety ] - Frequency Unlikely/Improbable Remote Quite Possible/Occasional Likely/Probable Very Likely/Frequent S2 [ Safety ] - Local regulations to be followed on site for working hours - First aid facilities will be equipped and prepared for any emergency - Regular drills conducted - Training of all operatives regarding heat stress management shall be given [ Environment, Social & Health ] - Poor welfare facilities - Poor medical facilties - Inadequate knowledge [ Environment, Social & Health ] - Generation of diseases - Contamination of land L2 Page 2 Signature : Date : 12 13 Jul Mar.2019 2019 * Prepare Job Safety Analysis when RRN is > L1 - Likelihood as is L2 - Likelihood with mitigating controls in place S1 - Severity as is S2 - Severity with mitigating controls in place VAN PHONG BOT THERMAL POWER PLANT PROJECT Attachment #7 Schedule of Pump station - 70 - | P a g e Rev:C CW Pump Station Activity ID Baseline Schedule for Lot (DHI) Activity Name Activity Status BL Project Start BL Project Finish BL1 Duration Dec 927 Jan Feb Mar Apr 2020 May Jun Jul 10 11 Aug Sep Oct Nov Dec 12 13 14 15 16 Jan Feb Mar 17 18 19 Apr 20 2021 May Jun Jul 21 22 23 NTP 26-Aug-2019 Aug Sep Oct Nov Dec 24 25 26 27 28 Jan Feb Mar 29 30 31 Apr 32 2022 May Jun Jul 33 34 35 2023 Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul 36 37 38 39 40 41 42 43 44 45 46 47 08-Dec-22, CW Pump Station 26-May-20 08-Dec-22 S1L4C1220 Excavation of CW Pump Station (Below Ground Level) Not Started 26-May-20 08-Aug-20 75 S1L4C1225 Con'c work of CW Pump Station (Below Ground Level) Not Started 09-Aug-20 10-Oct-21 428 S1L4C1230 Backfill of CW Pump Station (Below Ground Level) Not Started 24-Oct-21 23-Dec-21 61 S1L4C1235 Const of CW Pump Station (Above Ground Level) Not Started 11-Jun-21 12-Mar-22 275 S1L4C1240 Const of CW Pump Electrical House Not Started 26-Jul-21 10-Oct-21 77 S1L4C1245 Steel Structure Work of CW Pump Electrical House Not Started 11-Oct-21 12-Mar-22 153 Steel Structure Work of CW Pump Electrical House S1L4C1250 Finishing Work of CW Pump Electrical House Not Started 13-Oct-21 12-Mar-22 151 Finishing Work of CW Pump Electrical House S1L4C1255 Finishing Work (Non Technical Area) of CW Pump Electrical H Not Started 13-Mar-22 08-Dec-22 271 S1L4C1260 Install of Ventilation for CW Pump Station / Electrical House Not Started 22-Dec-21 21-Jan-22 31 S1L4C1265 Inspection of Ventilation for CW Pump Station / Electrical Hou Not Started 22-Jan-22 24-Jan-22 CW Pump Station Project Baseline Bar Remaining Work Baseline Milestone Actual Work Critical Remaining Work Milestone Aug Sep Oct Nov Dec 48 49 50 51 52 Excavation of CW Pump Station (Below Ground Level) Con'c work of CW Pump Station (Below Ground Level) Backfill of CW Pump Station (Below Ground Level) Const of CW Pump Station (Above Ground Level) Const of CW Pump Electrical House Finishing Work (Non Technical Area) of CW Pump Electrical House Install of Ventilation for CW Pump Station / Electrical House Inspection of Ventilation for CW Pump Station / Electrical House Page 13 2024 Jan eb 53 54