PROVN OF SOIL INVESTIGATION AND TOPO SURVEY FOR DEFICIENT OMQs AT AFS THANJAVUR.

Amount

Topographical Survey:-

To carry out the Topo survey as per scope of work given below:- Total area to be surveyed appx 150mx70m for at site.

(a) To carry out the survey by Digital Total Station equipment to include following details in layers. (i) Existing Infrastructure-: All Buildings including disused buildings, important land-marks, Roads/footpaths (both pukka and kutcha), all drains with direction of flow (in the case of larger drains, levels), culverts, sewerage (existing sewer network with all level details, location of manholes, sumps and their invert levels including existing soak pits and their invert level), water supply pipelines and electric/HT or LT power lines, overhead telephone lines, water bodies, low lying area for disposal of storm water drainage, compressed air lines, fire hydrants, retaining walls. (ii) Natural and man-made hazards-: Location of trees, potential natural and man-made hazards such as high tension power lines, power transformers, factory, low lying areas, foot hills, rock outcrops steep slopes, nalas, etc (iii) Contours-: Contour at 0.5 meter interval. Spot levels at all Junctions, changes in slope and at 30 meter intervals along all roads and lanes and where as required. For large area (i.e. greater than 01 Sq Km)-Contour at 1.0 meter interval shall be produced (iv) Base Map in case of extensive Sewage work-: All sewer network with location with reference like lateral/collector trunk line and manholes with their invert level, I - section, diameter of pipe etc.

(b) To carry out the survey by Digital Total Station equipment to include following details in layers. SURVEY REPORT (i) Digitization of entire data by presenting in different layers to get detailed Geo- referenced Topographical Maps. (ii) Maps shall be produced in digital form (AutoCAD) at a grid of 3 m x 3m. (iii) The printed copies shall be produced at a scale of 1:50 and 1:250 depending on the area size. (iv) Three Longitudinal and three transverse sections shall be shown. (v) Map shall indicate a Permanent building with its Floor level as Bench Mark

(c) SUBMISSION OF SURVEY REPORT:- Provide One draft printed copies of topographical map at a suitable scale to CE office and GE office each. GE shall forward comments to CE's office within one week of submission. (d) After approval and complying observations if any, 06 Nos. of Final printed copies (03 copies to CE’s office, 01 copy to CWE and 02 copy to GE) duly signed by AGE and GE. Consultant shall also submit 02 Nos of soft copies (01 copy to CE's office and 01 copy to GE) of topographical map shall be submitted. (e) After approval by CE office only, Completion certificate shall be issued by the GE / CWE.

M & L for Making necessary arrangement for mobilization and demobilization and Shifting of entire boring equipments, personnel, tools and arrangement from one bore hole to another bore hole location and setting of boring/drilling rig as required for soil investigation complete all as specified and as directed.

Drilling of boreholes, soil investigation and preparation report as per specification and scope of work in following locations / buildings:-

Md Accn for Sqn leader & above 4 blocks (in G+1 storey) : 08 Nos boreholes of depth 10m each at 20m c/c spacing all as specified and as directed.

Md Accn for Flight lieutenant and below 1 blocks (in G+1 storey) : 02 Nos boreholes of depth 10m each at 20m c/c spacing all as specified and as directed.

Scope of work of soil investigation (i) Mobilisation of equipment to site for soil investigation. (ii) Labour for making bore hole ( Bore hole-150 mm dia) by any standard method to following depth below ground level in all kinds of soil like clay, silt, sand, stiff clay, mixed silt etc, except rock (for the purpose of collecting disturbed and undisturbed soil samples, conducting standard penetration test at suitable intervals etc). (iii) Scope of Soil investigation shall be as follows: (a) Nos of boreholes and depth as decided by CEA. (b) Plate load test as decided by CEA. (c) Open Pit excavation to determine depth and size of fdn of existing nearby bldg as decided by CEA D. Carrying out the tests to ascertain soil/soft rock profile for determination of Safe Bearing Capacity(SBC) at work site by drilling holes as per relevant/latest IS Code, collecting samples of disturbed and un-disturbed soil. Conducting of following Field and Laboratory investigations, compilation of test results as per relevant and latest IS Codes:- i. Grain size analysis, identification & Classification of soil. ii. Unit weight (bulk density), natural moisture content, liquid limit, plastic limit, shrinkage limit, plasticity index, specific gravity. iii. Dry density, degree of saturation of soil. iv. Differential free swell (%) & Swelling Pressure if expensive soil is encountered. v. Shear Parameters (C-Phi Analysis) vi. Consolidation test & Permeability test

vii. Chemical analysis of Soil viii. Chemical analysis of ground water (water to be obtained from bottom of bore hole) ix. Depth of water table below Ground Level x. Loose soil/filled up soil, if any and its depth. xi. If weak soil with lesser N value as specified in table-1 of IS 1893 (Part-1) 2016 is encountered then evaluation of liquefaction potential shall be assessed and remedial actions to be adopted shall be specified. xii. Undisturbed soil samples shall be collected at 1.5 m interval and at change of strata. xiii. SPT Tests shall be done at 1.5 m interval. xiv. Crushing strength, degree of weathering (CR value) and RQD of rock samples. xv. As per IS 1892 clause 3.6.5.3, drilling for 3.0 m depth inside the rock is essential to ensure that boulders or layers of cemented soil are not mistaken for rock. xvi. For open foundations, Calculation of Net SBC at 1.5m, 2.0m, 2.5m, 3.0m, from shear as well as settlement criteria. SBC value shall be calculated based on C-Phi analysis as well as SPT value. For calculations formula given in IS: 6403 shall be used with shape factor of 1.0. xvii. If pile foundations are required than depth of piles shall be mentioned and pile capacity in compression, uplift & lateral loads shall be given for 300, 400, 450, 500 dia for under reamed piles & for 450, 500, 550, 600 mm dia for piles as suggested by consultant.

xviii. Recommendations regarding type of foundation to be adopted & Net SBC/ Pile capacities to be adopted. Also recommendations shall be given regarding stability of soil and soil stabilization required, if any. xix. Borehole positions duly marked on plan and their distance from adjacent prominent reference points. Size of the bldgs shall also be marked in the plan. This plan shall be signed by GE, AGE & Soil consultant. GL of location of Bore holes to be mentioned wrt benchmark and a comparative borelog of all bores shall be made wrt GL of each Borehole. xx. Bore log details shall be as per Appx ‘D’ of IS 1892. N values depth wise shall also be shown in details Bore log details shall be signed by AGE, GE & soil consultant. xxi. Photographs during soil investigation duly signed by AGE, GE and Soil consultant shall be enclosed with soil report. xxii. Recommendation of CWE & GE regarding SBC & type of fdn to be adopted shall be given in Soil Report. The following parameters are also be ensured :- (a) The soil investigation shall be carried out only through a reputed firm having valid NABL certification with minimum five years of experiance in the field and a person having a minimum technical qualification of M Tech / ME in Geo Technical Engineering. (b) The report shall be submitted by vetting only through a recognized insitutions Viz ., IIT / NIT / Any other Govt Engg college as approved by GE. Note:- If the depth of boreholes gets reduced due to site conditions, deduction @ of Rs 2000/m of length of borehole shall be made from the final payment.

Carrying out soaked CBR Test as per IS 2720 Part-16 for bituminous road with depth of excavation 0.6m below subgrade as per specified and as directed.

Plate load test for determination of modulus of subgrade reaction (K Value) as per IS 9214 as per specified and as directed.

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