Sunday, 23 July 2017

PROPOSAL FOR PERIMETER AND TOPOGRAPHICAL SURVEYS

SURCON QUESTION: YOU HAVE BEEN REQUESTED TO UNDERTAKE THE PERIMETER AND TOPOGRAPHICAL SURVEY OF AN AREA OF LAND OF APPROXIMATELY 5,000 HECTARES IN A FAIRLY HILLY AND FORESTED AREA. THE NEAREST CONTROL POINTS ARE 40KM FROM THE SITE. PREPARE A PROPOSAL FOR YOUR CLIENT, WHICH MUST INCLUDE THE OVERALL COST OF THE PROJECT.





The project shall comprise the following survey procedures:
1.      Reconnaissance survey
2.      Control extension
3.      Monumentation
4.      Perimeter
5.      Topographical survey
6.      Office work
Each of these procedures shall be described and cost of carrying them out outlined.

Reconnaissance Survey
Reconnaissance survey is the preliminary survey of the project area. It involves sighting the extent and marking turning points along the perimeter. Reconnaissance also involves locating available government control points. During reconnaissance, suitable and intervisible locations, at which survey points can be established, will be determined and marked in the ground. The reconnaissance survey shall be carried out by a team of one surveyor, three technical officers, one assistant surveyor and six labour crew. They shall be supported by transportation and basic equipment. The survey shall last for five days.

Direct cost for the reconnaissance survey:
1 senior surveyor                    N10,500.00 per day
1 Assistant surveyor                N5,500.00 per day
3 Technical officers                  N16,500.00 per day
6 Labour crew (line clearing)    N18,000.00 per day
Transportation                         N25,000.00 per day
Basic equipment                      N15500.00 per day
Total                                       N80,000.00 per day
Total for five days                    N400,000.00

Control Extension and Densification Survey
Control extension shall be done in two phases:
1.      Establishment of second-order controls. Four second-order controls points shall be established at strategic locations within the border of the project area.
2.      Establishment of third-order controls. Afterwards, using the second-order controls points, third-order controls shall be established all over the project area.

Global Positioning System (GPS) shall be employed to carry out the control extension. The third-order controls shall be established approximately 500m apart. As such about 200 such controls will be needed within the project area.
Equipped with two double-frequency and three single-frequency GPS receivers, the survey team shall spend two weeks on the field.

Direct cost for the control survey shall be as follows:
1 Senior surveyor                    N10,500.00 per day
2 Assistant surveyors               N11,000.00 per day
4 Technical officers                   N22,000.00 per day
4 Labour crew                          N12,000.00 per day
Transportation                          N25,000.00 per day
Basic equipment                       N50,000.00 per day
Total                                        N125,000.00 per day
Total for two weeks                   N1,750,000.00

Monumentation
The turning points marked on the ground during reconnaissance survey shall be beaconed according to SURCON specifications. The beacons shall be allowed to settle for two days before survey shall be carried out on them. From the reconnaissance survey, a total of 148 turning points have been identified. It shall take about ten days to complete casting the beacons.

Direct cost for monumentation
Cost of 118 standard cadastral beacons @ N1,000      N118,000.00
1 Assistant Technical Officer                                      N3, 500.00 per day
4 Labour crew                                                          N12, 000.00 per day
Transportation                                                          N25,000.00 per day
Basic tools                                                               N5,000.00 per day
Total                                                                        N45,500.00 per day
Total for 10 days                                                       N455,000.00

Perimeter Survey (GPS Relative Positioning)
GPS Relative Positioning method shall be used to carry out the perimeter survey. This method is faster and the 118 corners can be established in 6 days, instead of the traditional traversing which can take weeks.

Cost of GPS relative positioning survey
1 Senior surveyor                    N10,500.00 per day
2 Assistant Surveyors               N11,000.00 per day
4 Technical officers                   N22,000.00 per day
4 Labour crew                          N12,000.00 per day
Equipment                               N50,000.00 per day
Transportation                          N25,000.00 per day
Total                                        N130,500.00 per day
Total for 6 days                         N810,000 .00

Topographic Survey
Topographic survey shall be carried out at 10m grid; that is, horizontal and vertical position of points at 10m intervals throughout the project area. This shall be achieved using GPS kinematic method.

Cost of Topographic survey
1 hectare (10m grid)              N250,000.00
50 hectare (10m grid)            N7,500,000.00
5000 hectare (10m grid)        N75,000,000.00

Office Work
The project shall begin with office work and end with more office work. The initial office work shall include acquisition of available government control points and topographic maps. With existing maps we familiarize with the project area before going to the field. After field work, the office work shall include data processing, plotting and technical writing.

Cost of Office work:
Data processing                       N50,500.00
Plotting                                   N105,000.00
Technical report                       N50,500.00
Total                                       N206,000.00
Total cost of project                  N78,621,000.00

Mobilization/demobilization, 5% of total cost = N3,931,050.00
Contingencies, 5% of total cost = N3,931,050.00
Grand total                            N864,831,100.00


DISCLAIMER: This material is only an attempt to answer an examination question, though written from a background of solid knowledge and practical experience in Surveying and Geoinformatics. It has not gone through peer review. Therefore, all views and opinions expressed therein remain the responsibility of the author and do not necessarily represent that of any institution.  Feedback on corrections and constructive criticisms are welcome. Thank you.

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