N uiphaovica Package 2: Flyover and Bridge NUIPHAO PROJECT STATEMENT ON CONSTRUCTION ORGANIZATION PACKAGE 2: RAILWAY Flyover and ROAD FLYOVER Wolfram exploitation project - đa kim núi pháo, dai tu district, thai nguyen province foundation: - Based on Decree no 16/2005/N§-CP dated 07/02/2005 of Government on Construction Investment Project Management - Based on Decision no 06/2002/TTg dated 07/01/2001 of Government Minister approving Master Development Plan of Vietnam Transport and Railway to 2020 - Decision no 162/2000/TTg dated 15/12/2001 of Government Minister approving Master Development Plan of Vietnamese Transport Industry to 2020 - Document no 5621/BGTVT-KH§T dated 12/9/2005 of Ministry of Transport with regard to suggestion in Railway Relocation project and NH 37, section cross Mineral exploitation Area in Nui Phao, Dao Tu, Thai Nguyen - Document no 67941/BGTVT-KH§T dated 28/10/2005 of Ministry of Transport with regard to agreement about alignment direction of Railway and Road relocated across mineral exploitation Area in Nui Phao - Based on Decision no 917/2003/Q§-BGTVT dated 08/4/2004 of Ministry of Transport with regard to clearance over the railway - Based on Bid Document in July 2007 of Nui Phao Mineral Exploitation and Processing Joint Venture Company Upon carefully reading bid invitation document, technical design, visit and survey the site Based on our capability of equipment, material, manpower, finance, price conditions, the Contractor Joint Stock Company no 118 make construction method statement for project Package 2: Railway Flyover and Road Flyover, Wolfram Exploitation Project - §a kim Núi Pháo Đại Từ district, Thái Nguyên province Contractor: Joint Stock Company 118 N uiphaovica Package 2: Flyover and Bridge NUIPHAO PROJECT PART GENERAL INTRODUCTION I GENERAL CONDITION: - Relocation section of NH 37, start at Km147+745.97, end at Km151+230.00 The Railway Flyover locates on NH37, Km148+280.508 (based on current station of NH 37), under Wolfram Exploitation Project - Đa kim Núi Pháo, Ha Thuong commune, Đại Từ district, - Relocation section of Railway section Qu¸n TriỊu- Nói Hång, starts at Km14+307.28 and ends at Km18+243.00 Suèi C¸t bridge locates within station area Nói Ph¸o is on the way of relocation section Km14+874.50, under Vonfram Exploitation Project - Đa kim Núi Pháo, Ha Thuong commune, Đại Từ district II characteristics of bridge construction area: Terrain characters: - Thai Nguyen terrain includes low hill and mountains in direction of North-South Tam Dao, Ngan Son and Bac Son are the mountain chains surrounding Southwest At the Southwest, Tam Dao mountain chain with highest peak of 1590m, all mountainous walls are vertical and extended from Northwest-Southeast Ngan Son mountain chain starts at Bac Can, runs toward Northeast-Southwest to Vo Nhai Bac Son mountain chain runs in direction Northwest-Southeast - Terrain along the relocation section runs through mountainous area, medium elevation from 50-100m, in which there are two relativelysmall streams (01 stream having valley area of 3.7km2 and the other is 1.04km2) Characters of Climate and Hydrography a Climate: - Thai Nguyen climate has two separated season climate: rainy season from May to October, dry season is from November April next year Temperature difference between hottest month (June: 28.5oC) to coldest month (January: 28.90C) is 13.70C - Average rainy fall is 2000 to 2500mm, highest in August and lowest in January Rainfall is greater in Thai Nguyen city, Dai Tu district, while the rainfall in Vo Nhai district, Phu Luong is smaller About 87% of rainfall occurs in flood season (From May to October) of which the rainfall in Contractor: Joint Stock Company 118 N uiphaovica Package 2: Flyover and Bridge NUIPHAO PROJECT August accounts for 30% of total rainfall in a year, consequently, the flood is regularly happened b Hydrography: Originate from Ba La mountainous area, Dinh Hoa district, along Tam Dam mountain The river is stopped at Dai Tu, creates Nui Coc Lake with surface area of 25KM2 Cau river belongs to Thai Binh river system, with valley area of 3480km2, originates from Cho Don to North-Southeast, into Thai Binh river at Pha Lai town - The alignment runs throughout mountainous area, therefore the hydrography at the designed section is dependent on rainy mechanism of stream system crossing the section Geological Condition of Bridge Structure: + Based on survey result of geotechnical condition for Railway Flyover, the stratum design topdown is as follow: - KQ layer: embankment soil, made of mix clay, mix sand with gravel, root, rated loading R’=2KG/cm2 - Layer 1: Sand, grey-yellow gravel, wet, medium density Rated loading R’=2KG/cm2 - Layer 2: Grey-yellow mix clay, green-grey, in state of soft and tender Rated loading R’=1KG/cm2 - Layer 3: Grey-yellow mix clay, green-grey, in state of tender and hard, sometime mixed with pebble, and gravel Rated loading R’=1.38KG/cm2 - Layer 4: Grey-yellow mix clay, haft hard, mixed with crushes stone, macadam Rated loading R’=2.38KG/cm2 - Layer 5A: grey-white granite, weathered and chaps Rated loading R’=100KG/cm2 - Layer 5B: Grey-white granite, hard and strong, little chaps, longitudinal compressive-resistance strength: dry σkh=876.5KG/cm2, saturated σbh=859.5KG/cm2 + Based on survey result of geotechnical condition for Suoi Cat bridge, the stratum design topdown is as follow: Contractor: Joint Stock Company 118 N uiphaovica Package 2: Flyover and Bridge NUIPHAO PROJECT - Layer KQ: embankment soil layer, sandy clay, grey-brown macadam, tender and hard Rated loading R’=1.5KG/cm2 - Layer 1: grey-yellow gravel, Rated loading R’=4KG/cm2 - Layer 2: brown, grey-brown clay, hard and tender state Rated loading R’=1.8KG/cm2 - Layer 3: Brown clay, from hard-tender to hard-half, mixed with macadam, stone, un-weathered granite or weathered ones (Products of weathered granite) Rated loading R’=2.50KG/cm2 III scale, technical specification and applied procedure Scale and Technical specifications: + For Road Flyover (Flyover): - Applied Standard: 22TCN 272-01 - The Flyover is designed by permanent reinforcement concrete and Pre-stressed reinforce concrete - Design load: Active load HL93, passengers 0.3Mpa - Earthquake area : Zone - Width of bridge is correspondent to one of road pavement B=(0.5+8+0.5)=9.0m + For railway flyover and structures along the railway: - Design standards for bridge and culvert following limitation of 22TCN 18-79 - Bridge design standard: 22TCN 272-05 - Bridge is designed permanently by reinforced concrete - Designed load: Girder T22, abutment and piers T26, passenger road 300kg/m2 - Earthquake level: - Design frequency: P=1% - width of bridge is correspondence to one of pavement Applied Standards and Regulations: - Standards and procedures conform to norms applied in project Wolfram Exploitation - §a kim Nói Ph¸o: Standard name Design standards - Road Design Procedure Contractor: Joint Stock Company 118 Code TCVN 4054-85 N uiphaovica Package 2: Flyover and Bridge NUIPHAO PROJECT - Design Flexible Pavement Structure Criterion Standard - Design Rigid Pavement Structure Criterion Standard - Estimation of flood flow - Design Standards for Retaining wall - Design and Survey Standard for road pavement on soft-soil area - Road traffic signal Regulation - Crossroad Regulation issued 22TCN-211-93 22TCN-223-95 22TCN-220-95 QP23-65 22TCN-262-2000 22TCN237-01 in Decision no 727/2001 Q§-BGTVT dated 19/03/2001 - Bridge Design Standard - Design Standard for Railway width 1000mm no 433/Q§-KT4 dated 09/02/1976 of MOT - Applied standard: Design Standard for Railway width 1435mm - Vietnam Railway Operation Technique Standard - Railway Maintenance Standard no 396/§S-PC dated 22TCN 237-01 TCVN 4117-85 22 TCN 240-99 12/3/1981 - Railway Signal Standard: no 981/Q§/§SVN dated 24/4/1999 Standards and procedures for Reference - Design standards of AASHTO - Other current regulations and standard in Viet Nam III structure proposal and design result Ground for selecting structure proposal: + The selection of aperture and structure of flyover is laid on following foundations - Estimation results of hydrography, clearance requirements under bridge - high-art structure span, with low height to reduce the thickness of embankment at two approach road - Delicate substructure, the form is harmonized with span structure, assure the overall architecture of project - Selection of structure is based on available construction technology, in order to assure project quality and cost saving - As in accordance to terrain and geological conditions as well as facilitate the construction works Characteristics of Project Structure: Contractor: Joint Stock Company 118 N uiphaovica Package 2: Flyover and Bridge NUIPHAO PROJECT 2.1 Road Flyover 2.1.1.Flyover: The flyover is made by reinforcement concrete and pre-stress reinforcing concrete, with main points in superstructure, substructure and auxiliary structures + Superstructure: - 08 continuous Super-T-girder spans with two T continuous spans (39.15+3x40)+(3x40+39.15), Total length of bridge is L=330.588 - Structure of Super T girder span is made by pre-stressed reinforce concrete, rated length of L=40m (from centerline), cross section includes 04 girders with distances between girder centerline a=2.18m at super-elevation non-extended spans at a=2.38m at super-elevation extended spans, girder height 1.75m reinforced concrete deck with thickness 180mm, cast-in-place Bridge surface is a 70mm-AC course, above a 4mm-waterproofing layer + Substructure: - Abutment A1: Reinforced concrete wall, on foundation of 29 driven reinforcement concrete piles 40x40cm - Abutment A2: Reinforced concrete wall, on foundation of 09 bored piles with D=800mm - Piers P1, P2, P3 vµ P4: Round and solid pier column, reinforced concrete, on foundation of 20 driven reinforced concrete piles 40x40cm - Piers P5, P6 vµ P7: Round and solid pier column, on foundation of 06 bored piles with D=800mm + Guard rail structure for bridge: - Because of locating at intersection between specialized road and railway, the road section under the bridge shall be designed with guardrail to protect piers 2.1.2 Approach roads: - Approach road is designed at grade IV, designed speed V=60km/h - Total length of approach road is 20m, in which approach road at Quan Trieu side and Nui Hong side is both 10m Contractor: Joint Stock Company 118 N uiphaovica Package 2: Flyover and Bridge NUIPHAO PROJECT - 10m embankment behind abutment, width B = 10m, then gradually narrowed to B = 9m in next 15m long 2.2 Railway Flyover 2.2.1.Railway Flyover: The Flyover locates within Nui Phao station, it is arranged 02 separate railways on the Flyover, made by reinforced concrete, with following characteristics in superstructure, substructure and auxiliary structures + Superstructure: Span outline includes 02 reinforced concrete spans, L = 12.5m, each railway on Flyover include 02 girders, with distance of 4.5m between railways Span section for each railway include 02 T girders, height H = 1.2m, distance between girder centerlines a = 1.8m, camber f = 1.46cm Section below ballast layer is 40mm iron mesh concrete layer, make sloping layer on the girder is from 60-123mm, supported with specialized waterproof layer (Radcom 7) Superstructure: rail P43, reinforced concrete tie, ballast is laid by macadam + Substructure: - Abutment A1 vµ A2: U abutment, by reinforced concrete or concrete Foundation locates on reinforced concrete driven pile 40x40cm - Piers: Solid pier column, two round heads, reinforced concrete, Foundation locates on reinforced concrete driven pile 40x40cm 2.2.2.Approach roads: - Railway width 1435mm, dual ways within the station area Total length of approach roads is 20m in design document of Suoi Cat bridge, in which length of approach road in Quan Trieu side is 10m, in Nui Hong side is 10m 10m embankment behind abutment, width B = 10m, then gradually narrowed to B = 9m in next 15m long IV GENERAL COMMENTS ON PROJECT: Advantages: Contractor: Joint Stock Company 118 N uiphaovica Package 2: Flyover and Bridge NUIPHAO PROJECT The Contractor is capable and deep-experience builders, executing many nature-similarly projects Having close supports from inhabitants and local authorities in Thai Nguyen province The exploitation and supply of construction material around the construction area are rather convenience Social, economical conditions in the region is good and facilitate the construction as well as living of the Contractor staffs Disadvantages: - The section runs through out the area with annual rainfall 2048.1mm/per year, rainy season starts from May to October, in which the rain mainly falls in August, that makes difficulties in construction organization and project progress Contractor: Joint Stock Company 118 N uiphaovica Package 2: Flyover and Bridge NUIPHAO PROJECT Part General construction organization method I Proposed solutions in construction method The Contractor shall apply advanced construction methods, mobilize new equipments with suitable capacity as assuring a reasonable price, good quality and progress The construction method must meet the technical and requirements, conforming to Vietnamese and project standards Assure the environmental, sanitary conditions, labor safety, traffic safety and flow on the alignment as well as security When facing the difficulties during the construction, the Contractor shall work with Engineer, Employer, Designer and local authorities to timely settle the problems Ii Construction method: Upon reading design document, site survey and refer to material supply source, the Contractor propose a mix solution, in combination of mechanical and manual operation iii construction procedure: When completing the preparation works, the Contractor shall organize works in following steps Site preparation Construction of substructure Construction of superstructure Construction of approach roads Finishing work IV organization methods Project schedule : - Pursuant to progress requirements, available capability and competence, the Contractor plans to undertake the project for 365 days since the commencement day Contractor: Joint Stock Company 118 N uiphaovica Package 2: Flyover and Bridge NUIPHAO PROJECT _The Contractor shall make and submit the Engineer a detailed construction schedule for all work items, assure that the progress shall meet required date, Organize construction teams - Pursuant to work volume and construction schedule - Pursuant to equipment capability, well-skilled labor, the Contractor plans to organize the workers in to two construction teams as follows: +) Team 1: Construct Road Flyover +) Team 2: Construct Railway flyover ( Suèi C¸t bridge ) For which each construction team shall be divided into sub-team +) Sub-team to undertake the substructure +) Sub-team to undertake superstructure +) Sub-team to undertake approach roads - The construction work of the Contractor is based on approved plan by the Consultant Prior to commence any work item, the Contractor shall submit to Consultant working drawing and construction method statement and start work only when getting approval from the Consultant - During the construction, the Contractor shall rotate the labor, equipment, machinery, work in collaboration in executing the bridges, bridge items so that to fully bring equipment capacity, labor into play as well as assuring the best performance of the work II QUALITY ASSURANCE METHOD The Contractor shall organize the work as conforming to technical design document, applied standards and regulation in the project, assure technical specification, art, smooth traffic the Contractor shall absolutely abide by regulations, standards, design standard frame as applied in Wolfram exploitation Project – Da Kim NUi Phao, especially the Contractor shall bear in mind that; Contractor: Joint Stock Company 118 10 N uiphaovica Package 2: Flyover and Bridge NUIPHAO PROJECT - Safety staffs must be available uninterrupted at high-risk area, hazardous areas Safety staffs shall wear red ban, use loudspeaker to remind the workers - Equipped workers adequately with safety clothes, glove, shoes, comforter, belts - At clear area, place instruction boards to remind the safety work (in Vietnamese and English) Arrange guardrails for high construction area * Safety for Equipment - The Contractor should regularly check, maintain all safety tool and devices, scaffolding, rail guard, working slabs, crane, ladder and other access instrument, lighting system, sign board, signal, protection equipment… Lighting must be adequate seeing, and sign board must be clear and readable Should the safety equipment is out of order or in incorrect position, take remedial works or replacement immediately - Check carefully the components of equipment prior to operation - Inspection and maintenance works must be carried out in schedule - Operation of the machine must follow the instruction of manufacturer - Equip sufficiently the safety tools for equipment * Safety for project: - The change of construction step of each work item should be in the manner that the structure have enough loading capacity or is not influenced by ongoing items or future items - Make warehouse, storage yard, tool available to keep structure safety in case of natural calamity - During the construction work, notice to assure safety for completed structures, avoid collapsing or smash c Proposal to prevent forest fire: - Watch the high-risk area of forest fire - Arrange logically dwelling house compound of staff, workers, petrol store to minimize the fire causes - Make the fire fighting tools available in necessary case Contractor: Joint Stock Company 118 85 N uiphaovica Package 2: Flyover and Bridge NUIPHAO PROJECT SAFETY REGULATIONS - All staffs, workers, supervisors, managers must take part in preliminary safety training course when starting work If fail the examination on Vietnamese safety regulation and Nuiphaovica’s rules, those shall not permitted to work - Wear safety belt, abide by all regulations on traffic safety when operating vehicles on road Public safety must get special attention - Family members and friends of workers are not permitted to go into the working areas - Wear personal safety clothes and tools suitable to work nature Labor must wear safety clothes Do not allow to wear short-sleeved shirt, wear slipper, bare foot on site Wearing suitable shoes is a compulsory - All accidents, injury, hazards, insecurity conditions shall be reported to the Supervisors, then to Safety and Environmental Department of Nuiphaovica - Regular check and update the matter of sanitary, fire prevention and fighting work - Allow only authorized and educated people to operate equipment and machinery - Operation of the machine must follow the instruction of manufacturer - Workers must conform to instructions on sign board, hazard board at working site - Tie tightly the hanging ladder to avoid falling - Take notice to the danger of electrical lines - Do not allow to work under the high-placed equipment without any protection - Use personal safety tools suitable to work nature (dust mask, ears protection tool, helmet, shoes…) - Store explosive material in approved warehouse - Place hazard boards at all dangerous areas such as fuel storehouse - Disclose any dangers and report to local safety staff Contractor: Joint Stock Company 118 86 N uiphaovica Package 2: Flyover and Bridge NUIPHAO PROJECT - The Contractor shall submit monthly working-hours report to Environmental, Safety and Health Department of Nuiphaovica on th of each months  Detailed information on safety requirements by Nuiphaovica can be referred to Environmental, Health and Safety Book, include the following details: Personnel Protection tool Welding and cutting (PPE) - Safety tool for eyes Working in closed air Safety tool for head Scaffolding Safety tool for foot Ladder Safety tool for hand Safety at construction area Safety tool for ear Excavation, ditch, culvert and Breath equipment check foundation Safety in using explosive Anti-fall equipment Super-weight exploitation Industrial sanitation equipment Equipment, machinery Procedure of loading and Light trucks unloading Material control Conveyor belt Personal sanitation Laboratory Traffic regulations Safety regulations on camp Maintenance procedure Visitor regulations Manual equipment Contractor: Joint Stock Company 118 87 N uiphaovica Package 2: Flyover and Bridge NUIPHAO PROJECT Contractor: Joint Stock Company 118 88 N uiphaovica Package 2: Flyover and Bridge NUIPHAO PROJECT Environmental and sanitation assurance methods I contractor organization Organization chart: Project manager Director of environment department Vice director Staff of envi and material production Staff of construction environment Inspectors Inspector of units Note : Staff of electricity and water Inspectors Direct Report Assigned responsibility: - Director of Environment Department: - Understand the law, as well as procedure, document relate to Vietnamese environment - Make environment control plan, then submit to Consultant for approval - Direct the environment management board Contractor: Joint Stock Company 118 89 N uiphaovica Package 2: Flyover and Bridge NUIPHAO PROJECT - Take responsibility in environmental protection activities - Collect information from environment staff and inspectors in sub-units - - Report environment actions to the Consultant - Make daily construction records Vice director of environment Dept: - Understand the law, as well as procedure, document relate to Vietnamese environment - - Implement daily directions of the Director - Act on behalf of the Director in case of his absence - Report the assigned works to the Director Environment staffs: + Get orders from Director, then guide the construction units + Daily supervision for work relates to environment + Daily reports - Inspectors at construction units: - Abide by all instructions conveyed by the environment staff, then instruct for implementation - Inspect all environmental matter before work commencing - Check equipment, machinery in good environment condition - Remind contractor staffs to construct as conforming to approved procedure - Check the working conditions - Daily report to the environment staffs II environment approach and management: General regulations: - the Contractor shall conform to environmental protection law in 2006 as minimum requirement for project work scope - All workers are responsible to assure the tidiness of the site All waste such as paper, food, waste oil, chemical, material … shall be collected and treated as regulated - Direct management unit and leaders on site take responsibility to report all incident of fall, overflow chemical to Environmental Dept of Nuiphaovica and assure that all incidents are settled fairly Contractor: Joint Stock Company 118 90 N uiphaovica Package 2: Flyover and Bridge NUIPHAO PROJECT - In all case, oil or chemical shall not absorb into soil or underground water - All mechanic waste shall be stored in garbage dustbin - All harmless waste such as wood, steel, box shall be stored in industrial dustbin - All harmful waste shall be stored in separated dustbins - Daily waste shall be dumped into fixed location - Dust shall be minimized by watering - Noise level also be minimized to avoid impact to residents Equip workers with labor safety - Waste water treatment system, mud sediment control system must be maintained to prevent erosion and deposit going in the public culvert system Grading and Excavation: - Border for grading and excavation shall be set out clearly prior to work commencement - Construction area must be cleared from obstructions - Equipment and machinery should not operate outside the project border - In all cases of tree relocation, local authority shall be informed and take use of those The local authority or the Contractor to carry out this work Soil management with high-Arsenic content - Due to geological characters, soil in Nui Phao project has relativelyhigh arsenic content The high content of arsenic does not relate to the former operation of ore: workers at site, especially soil excavation workers could contact with soil of high arsenic content However, the researches show that a proper application of labor safety tool shall reduce the contact and infection - Regulation and actions for work that can contact to high-arsenic content  It is compulsory to use personal safety equipment for all staffs, contractor workers and visitors Contractor: Joint Stock Company 118 91 N uiphaovica Package 2: Flyover and Bridge NUIPHAO PROJECT  Required safety clothes and tool: comformter, mash, long-sleeve safety clothes, shoes and glove Eyes safety tool such as safety glass shall be used for proper work  Personal sanitation: Do not eat or smoke during the working time  Wash hand, face before stopping work, at the end day or when the work finishes  Change safety clothes when the work stops in order to reduce the arsenic contact  All trucks hauling arsenic soil shall be tightly covered with canvas before traveling to reduce dust  Watering at the areas to reduce dust  It is required to control dust and mud efficiently in the excavation area, or backfill work to prevent the soil goes into water and streams  The trespassing unauthorized people into site must be minimized  The utilization of personal safety equipment is compulsory to all contractor’ staffs the Contractor takes responsibility to supervise the hauling of closed-covered stone and soil Watering to reduce dust Noise control and air quality: a General - During the construction stage, the air pollutions might occur The following matters can appear: + Dust, waste air come from mixing of cement concrete + Dust comes from car travel + Waste air from transport means, Diesel generator… + Dust comes from excavation, backfill, embankment + Smell comes from rubbish, garbage, from burning waste or cut trees - All dust, waste air shall harm the environment, especially it impacts directly to the life, health of workers, residents in neighboring areas, tree and water in the region, to the landscape and consequently, to the local living Contractor: Joint Stock Company 118 92 N uiphaovica Package 2: Flyover and Bridge NUIPHAO PROJECT b Dust Control - the Contractor shall implement dust control program to limit dust pollution caused by hauling activities in the construction area or travel road This program includes an effective management plan for equipment, limit transport trucks, use proper shield, watering on the road and speed limit This should pays special attention to the removal of high-arsenic soil c Speed control: - Notify and conform to speed limits on the road within project area - Control travel on the service road - Provided that all equipment operators have been trained with proper certificate - Assure that all equipment operators are aware of the regulation and requirements on public safety and health d - Method to limit, correct or prevent: During the concrete mixing time, following methods shall be applied to limit impacts to environment  Regular clean and watering the concrete mixing plant, grinding machine and neighbor areas to reduce dust  Dry mixing plant shall be undertaken in closed area, air is ventilated to the suitable air filter  Install and operate a suitable air pollution control system at any time the mixing plant in operation  Regularly clean and water the concrete mixer  All stores of sand and aggregate in the mixing plant area, that are greater than 50m3 in volume, must be surrounded tightly by wall higher than material stockpiling - All internal-combustion engines can stop immediately - All waste-generated sources and accessories must be inspected and maintained regularly Contractor: Joint Stock Company 118 93 N uiphaovica Package 2: Flyover and Bridge NUIPHAO PROJECT - When operate equipment that use environmental-polluted fuel, get prior approval from the Ministry of Science, Technology and Environment - During the process of demolition, grinding or destroying, watering to control dust Water sprout equipment shall be used when load and unload excavated material, or at excavation and backfill areas - For work relates to sand, notice to speed and direction of wind to prevent sand blowing to construction area and residential area - All trucks with open body used for transporting material shall be mantled with shields around and behind The material piling shall be lower than the shields and covered with a canvas in good state Water: a General: - Water pollution is an important matter during the construction Water pollution can be generated from following actions: + Leakage of chemical agent, oil, petrol from equipment + Waste water from daily life and construction works + Rainy water flows over the construction area b Prevention and Treatment methods: - Build septic tank, chemical hole and small drainage system It is forbidden to allow water from septic tank going into surface water - Sewage water shall be treated by treatment plant This plant shall be designed and arranged in suitable position Then sewage water after treatment shall tap with natural water flow - Arrange temporary facilities far from catch pit at least 50m - Regularly check equipment, machinery to prevent oil and petrol leakage The replacement of oil shall be carried out within maintenance area - Water comes from engine maintenance area and repairing yard shall run through oil-catching tool before going out of the site - Store, yards, internal road shall be watered to reduce dust - Camp, stores, dining room shall be arranged tidily and cleaned regularly Contractor: Joint Stock Company 118 94 N uiphaovica Package 2: Flyover and Bridge NUIPHAO PROJECT - Arrange drainage system for camp area and construction area - Transport unsuitable soil to dump at required place, avoid dropping on the way - Tidy up and put equipment and tool in order after each working day All waste material and fuel shall not be dumped on site Noise: a - General: Noise on site is generated from high-strength sources with different natures It mainly comes from heavy operation on site such as air compressor, excavator, loading machine… travel trucks, excavating and unloading material, throne Besides, the poor maintenance of equipment also creates noise - Prior to work commencement, the Contractor must submit all necessary licenses on noise in construction In general, noise rate measured in camp on site is not over accepted rate - the Contractor shall abide by Law and legal regulation as TCVN 5965-1995, TCVN 5949-1998 b - Prevention and Treatment Measures: All noise-generated sources must be arranged far from camp and dwelling house - Stop all engine machines when they are out of work - Use modern noise-reducer to limit noise of mechanic electrical equipment - Super-weight equipment and machinery must be in good state to reduce noise - Lighting signal such as flickering signal can be in replacement for horn or bell to inform the shift change, concreting work, crane or other operations at site Sound alarming should be used in case of emergency - The Contractor shall use 3m-high noise-shield, movable along the construction site - Maintain equipment regularly and operate only equipment in good state Contractor: Joint Stock Company 118 95 N uiphaovica Package 2: Flyover and Bridge NUIPHAO PROJECT - The Contractor shall submit to the Consultant Noise report, giving details and general information of electrical equipment, mechanical equipment operated at site - The Contractor shall spare tentative plan in case of being claimed on noise during the construction phase Waste: a General: Nuiphaovica direct the waste dumping area for each specific Contractor - Construction work creates a quantity of waste The specialized company can decontaminate part of these wastes However, an amount of waste is usually dumped at site, such as unsuitable soil, small bricks, mortar, concrete material, burning remains + Waste comes from exploitation and processing, include Arsenic soil + Hazard waste includes oil, solvent, fuel and oil sediment + Industrial waste includes aluminum, glass, plastic, paper, wire, bulbs, carton box + Garbage includes meat, bone, vegetables, food …must be contained in plastic bag before dumping - The dumping or decontamination of waste, garbage can impact the quality of underground water, surface water, soil and air b Prevention and Treatment methods: - For garbage, it is necessary to collect waste into dustbin, then clean The dustbins can be made of iron, plastic with cover, or by specialized elastic agents - To collect daily waste, garbage, soil or aggregate use special trucks to transport - Construction waste shall be collected and stored in fixed and closed area The dumping area must locate far from residential area, water source and approved by the Consultant - The Contractor shall separate construction waste on the site for recycle Contractor: Joint Stock Company 118 96 N uiphaovica Package 2: Flyover and Bridge NUIPHAO PROJECT - Oil, paint, chemicals … must be collected and stored in closed area for selling or recycle - The Contractor shall sign contract with local environment company to collect and dump the daily waste, garbage Dangerous goods and Chemicals: a General : Dangerous goods and chemical can pollute the environment when coming to the environment Therefore, the management and utilization must take special care b Storing, loading, management and inspecting chemicals: - Oil products, lubricants, other polluted products shall be stored in a safety warehouse, far from water flow The store is 200m far from water streams and wet area The store is also not in the flood area Besides, the key direction of wind as well as specific hydrography conditions should also be considered - Container for oil products shall be surrounded by channel so as when occurring overflow, the product shall be kept in this channel - The store must be marked clearly to prevent trucks, transport mean and construction equipment to strike against container - All container and reservoir tanks shall be closed when out of order All stored products shall be taken away when the project finishes - In case of overflowing and pollution, urgently stop the overflowing, control the damaged area, then withdraw product, decontaminate waste, as well as restore the area to original condition For onland incident, separate the area by embank the dyke around the damaged area or dug the channel For off-shore incident, float retaining straw or absorbing material can be used - When the polluted agents are collected, take back them by available equipment such as absorbing agents, box, pump, shower … - Damaged soil should be moved away should it can pollute underground water This soil must be stored at proposed place If a safety dumping place is not available, the polluted soil shall be mantled with canvas or stored Contractor: Joint Stock Company 118 97 N uiphaovica Package 2: Flyover and Bridge NUIPHAO PROJECT Ecological Sources, Historical and Archeological Sources - The construction work sometimes disclose historical monument, with archeological, historical or paleontology value In such cases, the Contractor must report to the Supervisor about this discovery These monument could have great values that can be protected as followings: + Report to local authorities + Protect the site by make signal on the site + Continue the normal works Besides, the Contractor should put forward solutions to protect landscape during the construction phase These measures must be detailed in the drawings and cost estimate It can localize to protect by proper means, open freely for trespassing Following methods to be applied to reduce the impacts on ecology: i Do not destroy any kind of trees, grass at the neighboring areas ii Fences shall be built at all construction area iii The Contractor must protect all trees within the project area * Procedure in case of emergency in environment: The Contractor must prepare an emergency plan for environmental problem, that plan shall be submitted to the authorized body prior to work commencement The Contractor should also post clearly controlling method, prevention methods at working site 10 Site arrangement: - A normal working compound includes site office, yard, store, repair warehouse, parking area… Should the project locates far from urban area, the worker camps should be arranged And matters of water supply, sewage management, garbage, construction waste should also be considered These matters also influence the environment - The site arrangement must assure smallest confusion for environment - Arrange waste water treatment, garbage treatment and other waste treatment systems on site Regularly check, clean the site, control insect 11 Environmental Documents: The following documents should be kept: Licenses Contractor: Joint Stock Company 118 98 N uiphaovica Package 2: Flyover and Bridge NUIPHAO PROJECT Waste treatment Staff training records Correspondences with functional bodies Environmental claims Date 2007 Month Year CONTRACTOR REPRESENTATIVE Contractor: Joint Stock Company 118 99 ... are vertical and extended from Northwest-Southeast Ngan Son mountain chain starts at Bac Can, runs toward Northeast-Southwest to Vo Nhai Bac Son mountain chain runs in direction Northwest-Southeast... required strength - Continue strength concrete maintenance * Pier finishing work - Setting out and construct bearing pad Contractor: Joint Stock Company 118 22 when concrete get required N uiphaovica... PROJECT Management of bench mark system, control point system and construction survey works When the Employer handover design document, bench mark and control point system on alignment, the Contractor