Method_Topo Survey

0 1 Table of Contents Project Understanding ......................................................................................... 2 Purpose of the Topographic Survey....................................................................... 2 Reconnaissance Survey ...................................................................................... 2 Establishment of Survey Control .......................................................................... 3 Total Station Traverse and Orientation .................................................................. 3 Survey Grid and 20 m Level Detailing .................................................................... 3 Additional Ground Level Survey ........................................................................... 4 Survey of Existing Physical Features..................................................................... 4 Survey of Drainage and Terrain Features ............................................................... 4 Breakline Survey ................................................................................................. 5 Field Data Collection Using Total Station .............................................................. 5 Field Quality Control ........................................................................................... 5 Data Processing .................................................................................................. 6 Contour Preparation ............................................................................................ 6 Preparation of Topographic Base Map................................................................... 6 Survey Deliverables ............................................................................................ 7 Survey Workflow ......................................................... Error! Bookmark not defined. Conclusion ......................................................................................................... 7 Annexure ............................................................................................................ 8 Annexure 1: Location Map of the Plot ............................................................................ 9 Annexure 2: Survey Work Flow & Schedule ................................................................. 10 ......................................................................................................................... 10 2 Project Understanding Lide Bangladesh Tex2le Science & Technology Co., Ltd. is proposing to establish a tex2le manufacturing factory at Plot C14 within the Bangladesh Special Economic Zone (BSEZ). The project site covers approximately 50,955 m² (5.0955 ha) and is located along Road 7 of the BSEZ development. The proposed development comprises several industrial and suppor2ng facili2es, including finishing, dyeing and weaving sheds, a sub-sta2on, steam boiler room, hazardous chemical storage facili2es and passage/corridor areas. The proposed development includes reinforced concrete and steel structures with different building configura2ons and storeys, with an indicated total floor area of approximately 39,628 m². Considering the scale of the proposed industrial development, an accurate topographic survey is required to establish the exis2ng ground condi2ons, eleva2ons, drainage characteris2cs and physical features of the project site. The survey informa2on will provide an essen2al base for site planning, building layout, grading, drainage design, road and u2lity planning, earthwork es2ma2on and coordina2on with the proposed factory development. Purpose of the Topographic Survey The purpose of the survey is to establish an accurate horizontal and ver2cal representa2on of the exis2ng project site using Total Sta2on. The survey will par2cularly focus on: • Establishing survey control points and a reliable site reference system. • Surveying the en2re approximately 50,955 m² project area. • Collec2ng ground levels at 20 m intervals. • Iden2fying varia2ons in exis2ng ground eleva2on. • Mapping exis2ng roads, drains, structures, boundaries and other physical features. • Iden2fying exis2ng high points, low points, slopes and drainage paths. • Preparing a detailed topographic base map for the proposed factory development. Reconnaissance Survey Prior to commencing detailed fieldwork, a reconnaissance survey will be conducted over the en2re Plot C14 area. The survey team will review the exis2ng site condi2ons, access arrangements, terrain characteris2cs, surrounding Road 7 condi2ons and exis2ng physical features. During reconnaissance, suitable loca2ons will be iden2fied for Total Sta2on control points and benchmarks. Par2cular a_en2on will be given to exis2ng roads, drainage facili2es, site boundaries, structures, u2lity installa2ons and areas where significant changes in eleva2on occur. 3 The reconnaissance survey will also establish the most suitable sequence for Total Sta2on observa2ons to ensure complete coverage of the site. Establishment of Survey Control A survey control network will be established within and around the project site using Total Sta2on. Stable and accessible loca2ons will be selected for control points. Each control point will be securely marked and assigned a unique iden2fica2on number. Where reliable exis2ng BSEZ control points or benchmarks are available, the survey will be connected to those reference points. If such reference informa2on is not available, a suitable local coordinate and level datum will be established in consulta2on with the client. The control network will provide the reference framework for all subsequent boundary, level and feature surveys. Total Sta>on Traverse and Orienta>on A Total Sta2on traverse will be established between the control points to provide consistent horizontal and ver2cal reference throughout the project area. At each Total Sta2on setup, the instrument will be carefully centred and levelled over the control point. The sta2on coordinates and instrument height will be entered into the instrument, followed by orienta2on to a known backsight point. The traverse will be checked for angular and posi2onal consistency. Where possible, a closed or connected traverse will be adopted to enable closure verifica2on. Any significant discrepancy iden2fied during traverse checking will be inves2gated and corrected before detailed topographic observa2ons are finalized. Survey Grid and 20 m Level Detailing A systema2c 20 m × 20 m grid will be established across the project site. Considering the site area of approximately 5.0955 ha, the grid will provide a consistent framework for collec2ng exis2ng ground levels throughout Plot C14. At each grid intersec2on, the Total Sta2on will be used to observe the ground point and determine its horizontal coordinates and Reduced Level. Each surveyed point will be assigned a unique point number and recorded with the corresponding Eas2ng, Northing and Reduced Level. The 20 m grid will form the primary level-detailing system for the site. However, the grid will not be considered sufficient by itself in areas where the ground surface changes significantly. Addi2onal points will therefore be collected where required. 4 Addi>onal Ground Level Survey Addi2onal ground levels will be collected between the regular 20 m grid points wherever necessary to accurately represent the exis2ng terrain. Par2cular a_en2on will be given to: • Exis2ng high and low points. • Changes in ground slope. • Drainage channels and ditches. • Road edges and shoulders. • Exis2ng plaforms. • Pond or water-body edges, if present. This approach will ensure that the resul2ng digital terrain model accurately represents the exis2ng ground surface. Survey of Exis>ng Physical Features All significant exis2ng physical features within the project site and relevant surrounding areas will be surveyed using Total Sta2on. The survey will include, where applicable: • Plot C14 boundary. • Road 7 and relevant road edges. • Exis2ng access points. • Boundary walls, fences and gates. • Exis2ng buildings and structures. • Drains and drainage channels. • Culverts and crossings. • U2lity poles and visible u2lity infrastructure. • Exis2ng paved and hard-surfaced areas. • Trees and significant vegeta2on. • Water bodies and other natural features. • Exis2ng ground plaforms and embankments. Feature points will be recorded with appropriate descrip2ons or codes to facilitate prepara2on of the final CAD drawing. Survey of Drainage and Terrain Features Considering the proposed industrial development, special a_en2on will be given to exis2ng drainage characteris2cs. 5 The survey team will record the levels and loca2ons of visible drains, channels, culverts, low points and other drainage-related features. Where prac2cal, levels will be taken at the top and bo_om of embankments, drain edges and other significant changes in eleva2on. These observa2ons will assist in understanding the exis2ng surface-water flow direc2on and will provide useful informa2on for future site grading and drainage design. Breakline Survey Breaklines will be surveyed wherever there is a dis2nct change in the direc2on or slope of the ground surface. Typical breaklines may include road edges, drain edges, embankment tops and bo_oms, ditches, ridges, building plaforms and other terrain discon2nui2es. The breakline informa2on will be incorporated into the digital terrain model to prevent unrealis2c interpola2on between the 20 m grid points. Field Data Collec>on Using Total Sta>on The Total Station will measure horizontal angle, vertical angle and slope distance to the prism at each observation point. Based on the instrument setup and backsight orientation, the coordinates and elevation of each observed point will be calculated and stored in the instrument data collector. The survey team will systematically move the Total Station between established control points to ensure complete coverage of the approximately 50,955 m² site. Each instrument setup will be checked before observations continue, particularly where the survey requires multiple station changes. Field Quality Control Quality control will be maintained throughout the field survey. The following checks will be undertaken: • Verifica2on of Total Sta2on centring and levelling. • Verifica2on of instrument and prism heights. • Checking of backsight orienta2on. • Periodic re-observa2on of selected points. • Checking of control-point consistency. 6 • Verifica2on of important ground levels. • Checking of boundary and road-edge observa2ons. • Review of drainage and terrain feature levels. • Iden2fica2on and re-survey of abnormal or doubful observa2ons. Field data will be reviewed during the survey so that any missing or inconsistent informa2on can be corrected before demobiliza2on from the site. Data Processing Aker comple2on of the field survey, the Total Sta2on data will be downloaded and processed using appropriate survey and CAD sokware. The processing will include checking of coordinates, Reduced Levels, point numbers and feature descrip2ons. The processed survey points will then be used to develop the digital terrain model of Plot C14. The model will incorporate the surveyed 20 m grid points, addi2onal spot levels and breaklines to provide an accurate representa2on of the exis2ng ground surface. Contour Prepara>on Contours will be generated from the verified survey points and digital terrain model. The contour interval will be selected considering the rela2vely large industrial site area, exis2ng terrain varia2on and requirements of subsequent engineering design. The generated contours will be checked against the surveyed ground levels, drainage features, high points, low points and breaklines to ensure that they reasonably represent the actual site condi2on. Prepara>on of Topographic Base Map The final topographic base map will be prepared in CAD format and will provide a detailed representa2on of the exis2ng site. The drawing will generally include: • Plot C14 boundary. • Road 7 and relevant surrounding features. • Survey control points. • Benchmark informa2on. • 20 m × 20 m grid points. • Exis2ng ground Reduced Levels. • Addi2onal spot levels. • Contour lines. 7 • Exis2ng roads and access points. • Exis2ng structures and facili2es. • Drains and drainage features. • U2lity features. • Trees and significant vegeta2on. • Embankments and other terrain features. • Coordinate grid and north arrow. • Drawing scale and legend. The topographic base map will be suitable for overlaying the proposed factory buildings, roads, u2li2es, drainage systems and other planned facili2es. Survey Deliverables The completed survey will provide the following: • Detailed topographic survey plan of Plot C14. • 20 m × 20 m ground level plan. • Total Sta2on survey point database. • Digital CAD topographic drawing. • Survey control point and benchmark informa2on. Conclusion The proposed Total Sta2on-based topographic survey methodology will provide accurate informa2on on the exis2ng ground levels, terrain characteris2cs, drainage features and physical features of the approximately 50,955 m² Plot C14 site within BSEZ. The systema2c 20 m × 20 m level detailing, supported by addi2onal spot levels and breakline observa2ons, will provide an adequate basis for preparing the exis2ng ground model. The resul2ng topographic survey will support the planning and engineering design of the proposed tex2le manufacturing factory, including building layout, site grading, drainage, roads, u2li2es and earthwork requirements. 8 Annexure 9 STAGE 1 STAGE 2 STAGE 1 (79.810 ha) STAGE 2 (120.125 ha) G Location of- Lide Bangladesh Textile Science & Technology Co., Ltd. PROJ PROJ SITE SITE TOTA STRU BUILD BUILD NUMB WOR WOR BUILD D 1. BU COVE 2. MIN AREA (GR BARE 3. PA SEM 4. MA HEIG BUILD 1. PH SHED 2. PH SHED 3.PHA SHED 4.SUB 5.STE ROOM 6.HAZ 7.PAS CORR SUBT TOTA TOTA AREA REGU BUILD TOTA PROJECT SIGN-OFF & DRAWING INFORMATION OWNER'S NAME & SIGNATURE: ARCHITECT'S SIGNATURE & DETAILS: Name: RAJUK REGISTRATION NO. IAB MEMBERSHIP NO. Address: MOBILE: , EMAIL: STRUCTURAL DESIGN ENGR. & SIGNATURE: Name: Ahammad Kabir Structural Design Engineer, M/27263 IEB Registration # DMINB/CE- 0354 Cantt. Enlistment # DCB E-147 Mobile No.: +8801614 201 002 Lide Bangladesh Textile Science & Technology Co., Ltd. Annexure 1: Loca2on Map of the Plot 10 Annexure 2: Survey Work Flow & Schedule