General Provisions

Scope and Applications

These Specifications shall apply to the construction of three Ventilated improved (VIP) school latrines in Umdeface primary school for girls, Almaiaaya primary school and Ayak Um Rakooba primary school in Abu zabed locality – West Kordofan State. The Works under this Contract for three latrines comprises for each latrine: Excavation of the pits, construction of 4 rooms with 4 pits using red bricks and cement mortar, furnished with single 6 Doors and 4 small ventilation windows, construction of beam foundation, construction of reinforced concrete slabs fixed on the foundation and made lining with 2 barriers at the middle of the pit to the details as specified below.

The Latrines should be completed with the below basic specifications:

The Latrines:

1. The offer should be supported by technical data printout
2. Latrine should be located at the west or east direction of the school with 4 pits.
3. Latrine should be located 30m maximum from the nearest water source.
4. Latrine should be located 30m maximum from the nearest Kitchen.
5. The latrine should satisfy the user privacy (Front Protection wall 10m length*1.5m width* 1.7m to 2m height dimension as appropriate)
6. The latrine should be constructed based on WES and UNICEF standards and technical specifications
7. The excavated soil should be compacted around the latrine for more protection

The Pit:

8. Made small holes during the lining of pits to allow leaching of fluids resulting from decomposition of human excrement
9. The Pit must be lined completely from the inside so that the hole and the room do not collapse
10. Pit dimensions was 6 length*3width*4Depth

The Foundation:

11. Concrete slabs grounded on it. The Foundation use to prevent rodents and surface water from entering the pit, and it must be 15 cm above the surface adjacent to it

The Concrete Slabs/Floor:

12. Used to carry the user and to cover the hole, construct tightly with the foundation so that the edges of the slabs are identical to the outer edge of the foundation, construct of the concrete and use to provide with two openings:
13. Slot seat is the key shape length is 35 — 40 cm and 18 cm in diameter, must be provided with foot positions and be 20 degrees slope
    b. Circular or squire ventilation opening according to the shape of the ventilation pipe

Pit elevation from adjacent land surface:
13. The height of the constructed pit should be 50 cm from all sides above to the height of the land surface (NGL) adjacent to it

The Latrine’s room:

14. The size of the room should be proportional to the dimensions of the floor so as not to be large enough to encourage the user to defecate at any part of the floor
15. The entrance length of the room shall be at least 180 cm
16. Ventilation of the room through a hole in the upper walls of the room
17. Room design should provide sufficient natural lighting
18. The Zinc roof shall provide full protection for the room and shall have a large umbrella to protect the top
19. Make opening for the vents and holes for discharging the craps

Ventilation pipe: –
20. It should be long enough that the latrine’s roof does not affect the flow of wind at the top of it and that it should be above the ceiling by about 50 cm
21. The ventilation pipe must be placed outside the Latrine room facing the sun
22. A fly trap should be installed on the top of the pipe (a mesh to prevent the passage of flies and mosquitoes) and that the size of the mesh openings should not be more than 1.5 —- 1.2 mm
23. In order to avoid bad ventilation, the mesh should be made of corrosion resistant material and can withstand heat, rain, sunlight and gases.

Construction Specifications:
24. The Beam should be done down the latrine’s hole
25. Construction of latrine’s pit using brick and cement mortar and making of 2 barriers in the center of the hole and leave an area of 50 * 50 cm between them

26. Concrete mixtures should be 4:2:1
    27. Thickness of the tile should be 15 cm to be fixed on the reinforced concrete slab (Floor) and half of the room walls
27. The area of the latrine’s room should be 150 length * 110 cm width and 2.5 meters height
    29. Door dimensions should be 60 width* 180 cm height
    30. Dimensions of the window should be 40 width* 40 cm height
    31. Openings for the Vents and openings for waste/crap discharging should be made on the reinforced concrete slabs.
28. The roof should be made of heavy Zinc sheet 0.35mm.

CONSTRUCTION OF 3 VIP SCHOOL LATRINES IN ABU ZABED LOCALITY

1. Bill of Quantities for Construction of The three VIP school latrine

1. Mobilization

Bill of Quantity 1-1 for moblization

2. Civil works

Bill of Quantity for Earth work (Excavation and compaction)

Bill No.2-1 Excavation & Compaction

Bill No. 2-2 Concrete Masonry and plumping works

Summary of Bills of Quantities for Civil Woks

3. 3. Metal Works

Bill No. 3-1 Doors and Windows construction

COST SUMMARY FOR THREE SCHOOL LATRINES CONSTRUCTION PROJECT (Summary of Tender Price)