Filter Media Replacement along with replacement of Nozzles at Srimohangarh, District-Jaisalmer of Barmer Lift Water Supply Project, PHED, Project, Division-Srimohangarh, Jaisalmer under Circle- Barmer

PHED BSR-2023Revised ,PWD & RUDIP

Labour charges for screening of old sand (received from filter beds) through the standard sieves, washing the sand with HCL acid of required concentration as directed by the Engineer- In- Charge, so as to remove all the mud and other deposits from sand grains and then clean with water till the sand is as neat and clean that it impart no colour to clean while washing. It also includes placing this washed filter media (sand) in filter beds in layer as instructed by the Engineer- In- Charge. (RGF, SSF), Note- Nos of Filter Bed=16, Size of Each Bed= 12m.X8m. Depth of Sand in Filter Bed=60cm, Loss of Filter Sand during the past 15 yrs=33% of 60cm=20cm, Left out Sand depth in Filter Bed=60cm-20cm=40cm, Quantity=(12x8X.4)X16=614.4Cum

Labour charges for screening of old gravel (received from filter beds) through the standard different sizes sieves for required sizes of gravel, washing the gravel with HCL acid of required concentration as directed by the Engineer- In- Charge, so as to remove all the mud and other deposits from gravel grains and then clean with water till the gravel is as neat and clean that it impart no colour to clean while washing. It also includes placing this washed gravel in filter beds in layer as instructed by the Engineer- In- Charge. (RGF, SSF) Note-Nos of Filter Bed=16, Size of Each Bed= 12m.X8m. Depth of Gravel in Filter Bed=50cm, Loss of Filter gravel=10% of 50cm=5 cm, Left out Gravel depth in Filter Bed=45cm, Quantity=(12x8X.45)X16=691.20Cum

Providing and Placing of new filter media as (i) Sand shall be hard and resistant quartz or quartzite and free of clay, fine particles, soft grains and dirt of any description. (ii) Effective size shall be 0.45 to 0.70 mm. (iii) Uniformity Coefficient not be more than 1.70 nor less than 1.30. (iv) Ignition loss should not exceed 0.70% by weight. (v) Soluble fraction in HCL acid shall not exceed 5.0% by weight, (vi) Silica content should not be less than 95% (vii) Specific Gravity shall be in the range between 2.55 to 2.65 (viii) Wearing loss shall not exceed 3.0%. and as per specifications given in IS: 8419 (Part-I). Filter media (fine sand and coarse sand) should be processed through disintegrator and dust separator in automatic plant including screening of sand to desired specification and washing and cleaning of sand with water by aqua wash technology at quarry site. (For RGF), Note:- Nos of Filter Bed=16, Size of Each Bed= 12m.X8m. Depth of Sand in Filter Bed=60cm, Loss of Filter Sand=33% of 60cm=20cm, Left out Sand depth in Filter Bed=40cm, After Washing lost of Sand Depth= 20% of 40cm=8cm, After Washing leftout SandDepth=40cm-8cm= 32cm, Required new graded gravel depth =60cm-32cm=28cm, Quantity= (12mX8mX.0.28m)X16= 430.08 Cum

Providing and placing of new graded gravel as (i) Size of Gravel vary from 50 mm at the bottom to 2 mm at the top as detailed: (a) Passing 80 mm screen but held on 10 mm- 150 mm layer (b) Passing 25 mm screen but held on 10 mm- 50 mm layer (c) Passing 10 mm screen but held on 5 mm- 50 mm layer Passing (d) 5 mm screen but held on 2 mm- 50 mm layer (ii) The filter gravel shall be as spherical as possible, hard, clean and uniform in quality and also shall not contain such impurities as dirt and clay as per IS: 8419 (Part-I) for filter gravel specifications. The work also includes washing the gravel with required concentration of HCL acid and finally with water and placing the same in filter beds as per direction of Engineer- In- Charge and technical specification complete in all respect. The gravel shall not contain more than 5% acid soluble matter as determined by solubility test in Appendix B of IS: 8419 (Part-I) amended up to date. (For RGF), Note-Nos of Filter Bed=16, Size of Each Bed= 12m.X8m. Depth of Gravel in Filter Bed=50cm, Loss of Filter Gravel=10% of 50cm=5cm, Left out Gravel depth in Filter Bed=45cm, After Washing lost of Gravel Depth= 5% of 45cm=2.25cm, After Washing leftout Gravel Depth=45cm-2.25cm= 42.75 cm, Required new graded gravel depth =50cm-42.75cm=7.25cm, Quantity= (12mX8mX.725m)X16= 111.36Cum

Providing and laying in position specified grade of cement concrete for RCC structural elements upto floor five level including curing, compaction, finishing with rendering in cement sand mortar 1:3 (1 cement : 3 coarse sand) and making good the joints and cost of plastizers (if required) excluding the cost of centering, shuttering and reinforcement for Arches, arch ribs, domes, vaults, shells, folded plate, chimneys, shafts, roofs having slope more than 15degree, vertical and horizontal fins individually or forming box louvers, facias and eaves boards M20 Grade Nominal Mix/Design Mix. Note:- Nos of Filter Bed=16, Size of Each Bed= 12m.X8m. Depth of RCC base of nozzels Bed=20cm, 20% Damage of RCC Slabe due to 15 years of continuous operation. Quantity=16X(12x8X0.2)X0.20=61.44 Cum

pH Analyser: Transmitter : Range: 0-14 pH, Power Supply 230 VAC, Input: One Digital Sensor, Output: 4-20mA HART, IP66 Protection / Tx protection cover required / Sensor Range 0-14 pH , able to transmit digital signal to transmitter, calibration data can be transferred to Transmitter , process temp: 65 deg cen/ flow through tee MOC SS.

Providing, installation, testing and commissioning of Turbidity Analyser : Range - Selective 0 to 4000 NTU, Accuracy:+/-2% of reading or +/-0.02NTU; Compliance to US EPA180.1, With inbuilt transmitter with 4-20 mA output , Relay contacts & Modbus communication.

Add extra for providing richer mixes respectively at all floor levels Providing M-25 grade concrete by using as per codel provision instead of M-20 grade

Removing, providing & fixing of TYPE D Nozzles for under drainage system including cleaning of slots with all Material etc.(Excl.cost of pipes) This job, also, includes Cleaning of holes if required in LS Contract basis.