pre construction surveys &clearences

8/8/2019 Pre Construction Surveys &Clearences

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Route & Site selection Surveys

And

Clearances from Statutory Bodies

in Pipeline Projects

U K Palon

26-07-2010


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Contents

Concept of Route Survey & Types thereof

Reconnaissance Survey or REKI

Detailed Route Survey. Cadastral Survey

ROW & its acquisition

Other Miscellaneous Surveys

Site selection for Terminals, Pump-stations,

Tank Farms, RCPs etc.

Clearances and permits from Statutory Bodies


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What is Surveying?

Surveying is a pro-active action for

collecting information/data for either

enabling a decision making process or forexecuting an activity in a Project


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Data/Information

(For Pipeline Projects)

The Information/data collected in Pipeline Route Survey

helps in deciding following parameters for Project

execution:

Length & Profile

Hydraulics

Investment Cost

Long-term Operating & Maintenance Cost

Project Completion Time


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Types of Survey in Pipeline

Projects Reconnaissance Survey or REKI

Detailed Engineering Survey

Detailed Route Survey

Soil Stratification Survey

Soil Resistivity Survey

Acquisition of ROW

Cadastral Survey

Other Miscellaneous Survey

Sub-soil Investigation

Topography Survey


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LIFESPAN OF PROJECT

Conception Approval Execution Operation

Approval ofProjectPre-Project Activities

FirstStageApproval

Pre-Constn.activities


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Surveying Activity vs Project Phase

Reconnaissance Survey

or REKI

Detailed Route Survey.

Also called as Detailed

Engineering Survey

Cadastral Survey

Acquisition of ROW

Other Miscellaneous

Survey

Project Conceptual

StageFor FR Details

After First stage

clearance for Detailed

Feasibility Report (DFR)

Project Approval Stage-

Prior to Start of Field

work for Mainline

Laying

As and when necessary


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Carried out during Project Conceptual Stage

The details are required for Feasibility

Report

A technically feasible shortest & cost-effective

route is identified

Various important features and information

en-route that may affect the Project anyway

are listed


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Desk-Top study to identify various alternatives

Verification of ground truth

Establishing Ground Control Points Listing of Crossings, details, rough profiles

Land-use pattern en-route

Development/expansion plan, contact Nos., addressesof various Authorities

Unit rates of Materials and Manpower


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No major surveying tool is used

Usually require 1 wk to 6 wks depending on length,

terrain & manpower used

Verification of Ground Truth is important People of local origin/ language is very helpful

Information/ data/ sketch/ documentation are most

important


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Desk-Top Study

Extensive use of SOI Topo-sheets

Few alternatives are chalked outs

Comparative merits/demerits are listed GIS Packages are extremely helpful

Extensive Use of Satellite Imagery & Google

Earth Software now-a-days


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Route Finalisation

To connect originating, terminating & obligatory points.

To avoid densely populated area & city limits.

To avoid reserved forest, wild life sanctuary, maritime

zone.

Passage through forest area should be minimum, if not

avoidable.

Approachability to ROW for maintenance.

To avoid hilly and highly undulated zone/ broken lands.

To avoid permanently marshy/ waterlogged/ flood pronearea.

To avoid mining areas.

Minimum crossings.


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Verification of Ground-Truths

This is carried out on the finally selected route,unless otherwise required

This is necessary, since, Topo-sheets are updatedafter 2-3 decades

Expansion plans, urbanisation scenario,Developmental activities, river-course &aforestation programme keeps on changing

Any strech of restricted ROW

Prospect for aquiring additional ROW in case offuture lines


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Establishing Ground-Control Points

These should be at prominent places and easilyidentifiable at a later date

Locations are serially documented w.r.t. nearbystructures, KM post, Electric/ Telephone

pole/tower etc. Should be well discussed with local villagers

Photographs are taken for easy identification infuture


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Collection of Data

River course profile with approximate dimensions

Sketches of Road crossings with future widening

plan, if any

Addresses, Telephone Nos. & contact persons of

Various authorities en-route

Unit cost of various construction materials andmanpower for estimation purpose


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Detail Engineering Survey

This activity is taken up during approval stage,

when approval is considered almost certain

Prior to this, route was on maps and paper. This

is the first field activity taken up for PipelineProjects

Detailed Engineering Survey primarily consists

of:

Detailed Route Survey &

Soil stratification Survey &



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By this time, the obligatory points of the routesare already identified and the configuration ofPipeline is also known

In this activity, route is progressively staked on

ground preferably from one obligatory pointand demarcated with TPs and IPs andrelated reference points.

Exact distances between TPs & IPs, included

angles, elevations etc. are accurately measuredand recorded by theodelite /total stations

The levels are taken at every 50 M distance ofthe staked route


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Crossing locations are identified and detaileddimensions are taken A basis for detailedwork estimate and tendering

Salient features on both side of the stakedroutes are recoded and indicated on the routemap prepared in a scale of 1: 10,000

TPs, IPs & crossings are serially numbered and

marked on route maps Profile Maps are prepared to a scale H 1:5000

& V 1:100

Ri h f W (ROW) & I


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Right of Way (ROW) & Its

acquisition Right of Way is acquired through PMP Act 1962

Through this Act, Corporation acquires right of use of this

land for laying a Pipeline, operating and maintaining the

same by paying a specified compensation

This is a very lengthy and complicated legal process, often

dictating the total completion period of the Project

Whenever ROW is acquired on a land, land use pattern

can not be changed by the owner

ROW acquisition is accomplished by dedicated team

deputed for this purpose from state Land revenue deptt.

Unless planned in advance and monitored properly, this

activity is mainly responsible for time over-run


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Cadastral Survey

This is carried out for the purpose of ROW acquisitionand calculation of compensation

On village revenue maps, the ROW of 18 M width is

plotted and affected survey nos. are identified.

The area calculations are made and amount of compensation are calculated based on the prevalent land-

rates

Ownership records, e.g. 7/12 are sorted and

compensation amount is disbursed before taking up pipe

laying works

During this survey, few diversions of route may take

place to accommodate unavoidable circumstances


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ROW Acquisition

The land schedule including ownership details are preparedand notification under section 3(i) and individual notices are

issued

Objection are heard by Competent Authority (CA) and these

are either dismissed or held resulting in diversion

After attending to objections, notification under section 6(i)

and individual notices are issued

The compensation is disbursed after hearing of objection, if

any

The acquisition process starts with collection of village

revenue map and cadastral survey

After payment of compensation, ROW can be opened by the

owner for construction purpose


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Other Miscellaneous Survey

Soil Investigation


Soil stratification

Survey

Topography &

Contour

Soil Investigation and

River Profile

For taking up foundation

Design

Carried out at 500 M interval

along the route at 1M, 1.5M, 2

M and 2.5M depth for CP

design

For ascertaining terrain

details and taking proper care

in Mainline tender for coating

as well as earthwork Station Construction

For design of HDD crossings


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Site Selection

Sites are selected for:

Tank Farms Area as per requirement (> 60 70

acres ) Pump Stations 1012 acres

Delivery Stations 6 -10 acres

RCPs 0.5 acre

Valve Locations 5M x 5M

Permanent Land Acquisition Act 1894


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Criteria for Site Selection

Shall fall on selected route

Fairly level high-land requiring less earthwork

Easy Approachability through Major Road

(No Levelcrossing or Road blocks in Approach) Availability of Water & Power

Away from Urban Development and Residential

Area

Maintenance Facility nearby

Sub-soil Properties suitable for Required

Foundation Systems

Drainage outlet


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CLEARANCES & PERMITS

Clearance from State Pollution Control Boards (NOCthrough Public Hearing) Water preservation & Pollution

Control Act 1974 amended in 1978 & 1988

Forest clearance under Forest Act, 1980 amended in 1988

Consent to establish under water and Air Act from State

PCBs

Clearance from Mining Authorities (wherever required)

MOE&F clearance and clearance from Maritime Board &

CRZ Authorities (wherever applicable)

NOC from DMs of encountered districts CCE and OISD clearance

Permits from Railway/ Irrigation/ Highway Authorities

Clearance from State fire Brigade

Factory license/ Clearance from Electrical Inspector.


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Thank You

pre construction surveys &clearences

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