Construction of Recharge pit at 05 Nos ring well sites of various village at Teressa Island under Construction Division APWD Kamorta 3rd Call

Amount

Construction of Cement Concrete Chamber of size 1.50m (L) x 1.50m (B) x 0.70m (Internal Dimensions) with open top for each recharge pit consisting of following component of works:- i) 20cm thick hollow block Walls of Cement concrete 1:3:6 (1 cement : 3 coarse sand : 6 graded stone aggregate 12.5 mm nominal size) fixed with 1:6 cement mortar forming internal dimensions of 1.50m (L) x 1.50m (B) & Walls finished with 12 mm cement plaster of 1:3 (1 cement : 3 Fine sand) along with Foundation base of Cement concrete 1:4:8 (1 cement : 4 coarse sand : 8 graded stone aggregate 40 mm nominal size) size 30cm wide & 15cm deep provided below the wall .ii) Providing & Fixing 04nos of RCC Manhole cover slab (with perforations 25Ø) of size 75cmx75cm & 10cm thick for each recharge pit using reinforcement cement concrete of 1:1.5:3 mix ( (1 cement : 1.5 coarse sand : 3 graded stone aggregate 20 mm nominal size) including earthwork in excavation for upto required depth below GL & disposal of surplus earth complete within a lead of 50mtr and reinforcement works etc all complete as per the enclosed drawing and directions of EIC. (Note :- Single mesh- 10mm dia steel bars @ the spacing of 150c/c both ways shall be provided as reinforcements in the rcc cover slab)

Construction of 01nos of square shaped recharge pit with sedimentation pit of size 1.20m (L) x 1.20m (B) x 1.20m (H) with Filter media consisting of bottom most layer (1st Layer) 60cm deep with 22.5cm sized stone boulders,2nd Layer of 60cm deep filled with 63mm to 45mm, 53m to 22.4mm,22.4mm to 11.2mm sized stone aggregates each of 20cm deep respectively and top most layer of size 1.50m (L) X 1.50m (B) 30cm deep filled with coarse sand of size 1.50 to 2.00mm , full complete in graded form i/c laying of a impervious sheet) below the layer of Coarse Sand and earthwork in excavation for upto 1.75m depth below GL & disposal of surplus earth complete within a lead of 50mtr all complete as per the enclosed drawing and directions of EIC.