| SL# | Item Code | Item Description | Unit |
Rate for ZoneA Dhaka & Mymensingh Division |
Rate for ZoneB Chattogram & Sylhet Division |
Rate for ZoneC Rajshahi & Rangpur Division |
Rate for ZoneD Khulna & Barishal Division |
|---|---|---|---|---|---|---|---|
| DIVISION 27 : DEEP TUBE-WELL | |||||||
| 1791. | Complete development of the tube well by suitable air compressor and pump of suitable capacity by alternate surging and pumping until satisfactory yield, sand free water and the turbidity condition is reached using necessary quantity of calgon and conducting step draw down test before and after the development as per specification and accepted by the Engineer-in-charge. (Development should be started within 24 hours of completion of shrouding). | ||||||
| 1792. | Pumping test of the well by designed turbine/submersible pump with supply of testing equipments for pressure/ velocity/ discharge etc. and all materials for 72 hours including yield drawn and recovery test etc. complete as per specification and accepted by the Engineer-in-charge. | hour | 1361 | 1359 | 1346 | 1346 | |
| 1793. | Disinfections of the well including supply of sufficient quantity of bleaching powder (33% strength) chlorinated water having 150 ppm available free chlorine complete as per standard specification and accepted by the Engineer-in-charge. | each | 3288 | 3288 | 3288 | 3288 | |
| 1794. | Filling of the borehole around the tube well from top of the shrouding up to the bottom of sanitary seal by withdrawn selected soil or local clay free from any substances harmful to pipes and health as per standard specification and accepted by the Engineer-in-charge. | meter | 85 | 83 | 78 | 78 | |
| 1795. | INSTALLATION OF 50 mm x 150 mm DIA SHROUDED | ||||||
| 1796. | PRODUCTION WELL WITH G.I. PIPE | ||||||
| 1797. | Boring: Execution of 325 mm dia boring through all sorts of strata by reverse circulation or any other approved method (Method other than reverse circulation is to be applied only for wells deeper than 152 meter) for boring 325 mm dia vertical hole up to designed depth and collection of soil samples at every 3 meter interval and at every change of formation including sinking and withdrawing necessary casing pipe and all necessary arrangements complete as per specification and accepted by the Engineer-in-charge. (Measurement will be allowed from G.L. to bottom of the blind pipe and the rate is inclusive of the cost of extra depth of boring required for caving and siltation) | ||||||
| 1798. | Supplying the following tube-well fixtures and pipes conforming to standard BS-1387 & BDS-1031, having chemical composition (in%) carbon 0.17-0.25, manganese 0.95-1.20, sulphur 0.060 max, phosphorous 0.060 max, tensile properties: miminum yield strength 188 MPa, minimum tensile strength 313 MPa and marking for a) manufacturer b) material c) wall thickness d) nominal outside dia e) intended use etc. on the body of the pipe at working site as per standard practice and accepted by the Engineer-in-charge. | ||||||
| 1799. | Disinfections of the well including supply of sufficient quantity of bleaching powder (33% strength) chlorinated water having 150 ppm available free chlorine etc. complete as per standard specification and accepted by the Engineer-in-charge. | each | 1644 | 1644 | 1644 | 1644 | |
| 1800. | Filling of the borehole around the tube well from top of the shrouding up to the bottom of sanitary seal by withdrawn selected soil or local clay free from any substances harmful to pipes and health as per standard specification and accepted by the Engineer-in-charge. | meter | 48 | 47 | 44 | 44 | |
