TOPOGRAPHICAL SURVEY AND SOIL INVESTIGATION FOR PROVISION OF DEFICIENTMARRIED ACCOMMODATION FOR OFFICERS (LT CDR AND ABOVE) AT NORA, VISAKHAPATNAM

Amount

Topographical survey with 3m grid intervals and 0.5m contour intervals to provide with accurate base - line information data with all existing permanent infrasturcture / utilities details of the proposed site at NORA, Visakhapatnam including reconnaissance to get broad view of entire area for planning (using total station), complete all as directed by Engineer-In- Charge. CAD file along with contorous and benchmark duly marked must be submitted in a CD ( 4 copies)

Mobilisation of equipment to site for detailed soil Investigation and shifiting them location to location of bore holes and for in-situ tests.

Boring holes 150mm dia in any types of soil icluding weathered rock, SDR and soft rock but excluding hard rock/fractured rock up to a depth until hard rock/fractured rock strata encountered including following activities: (a) Conduct of SPT at every 1.5 m interva or change of strata whichever occurs earlier. (b) Collection of undisturbed soil sample (UDS) at every 1.5 m interval or change of strata whichever occurs earlier(a minimum gap of 500mm shall be ensured between SPT and collection of UDS. Note : i) Drilling in hard rock/fractured rock shall be measured and paind under item no. 3 ii) In case of meeting boulders, the boring beyond boulder depth shall be measured under this item iii) In case of non-feasibility of collection of undisturebed soil sample, distureb soil sample shall be collected, duly recording the reason.

i) Drilling holes in hard rock/fractured rock using hydraulic drilling machine within the boreholes for cutting cores in rock and collection of cores of requisite size and length as per relevant IS Standards. Drilling shall continue minimum 5m into hard rock strata

ii) Conduct of following laboratory tests on rock samples/ cores collected from bore holes as per relevant Indian standards [see IS 2720 (All parts) and IS 1498, IS 9143, IS 13030, IS 9221. IS 8764, IS 9179, IS 10050, IS 10082, IS 10782, IS 12608, IS 13047, IS 3025 (i) Visual classification. (ii) Density. (iii) Specific gravity. (iv) Hardness. (v) Degree of weathering (vi) Uniaxial compression test (both saturated and unsaturated). (vii) Point load strength index. (viii) RQD(rock quality designation) Note: i) Item to be operated only in case of encountering rock in borehole with the written permission of GE ii) This is compulsory item for the cases where pile foundation is anticipated

Conduct of following laboratory tests as per relevant indian standards IS 2720 all parts IS 1498 and IS 3025 of soil samples collected. (a) Test on disturbed/ undistubed samples :- (i) Visual and engineering classification. (ii) Sieve analysis and hydrometer analysis. (iii) Atterberg limits (liquid limit, plastic limit and shrinkage limit). (iv) Specific gravity. (v) Free swell index. (b) Test as on Undisturbed samples. (j) Bulk density and moisture content. (ii) Unconfined compression test (on remoulded undisturbed sample) (iii) Swelling Pressure (on remoulded undisturbed sample) (iv) Determination of C&O valvues using direct shear drained/undisturbed sample ) or triaxial compression tests (on undisturbed or remoulded samples or vane shear test)

Chemical analysis of ground water sample collected at bottom of one bore hole.

Chemical analysis of soil samples one each from each strata in respect of one borehole. If different stata(s) encountered in any other borehole additional soils samples to be analysed 1. General On completion of the in-site and laboratory tests, subsurface investigation report shall be prepared which should include geological information, procedure adopted for investigation, field observations, laboratory or test data, analysis, interpreataion, recommendations etc. 1.2 Information to be provided: The report shall include but not to be limited to the following: a) Dimensioned Plan showing location and depth of in-situ tests; the coordinates of bore hole locations with reference to prominent permanent features of the site duly signed by GE and Geo consultant; b) Geological information of the area; c) General topography of the site, duly marking RL of the location of bore holes with reference to RL of nearly permanent features available at site duly signed by GE and Geo Consultant; d) Past usage and historical data of the site, if available. Information regarding flooding of the site in the past, High Flood Level etc. e) Bore log and trail pit log duly signed by GE and Geo Consultant. f) In-situ rest results; g) Plot of standard penetration test (N values both uncorrected and corrected) with depth for identified areas; h) Laboratory test results j) Summary of strata profile k) In case of pressure meter tests the following should be furnished: 1) Calibration record including description of membrane and sheath on probes, dimension of thick walled cylinder, length of flexible tubing, calibration curves/chart, temperature, etc. 2) Drilling record including borehole number, method of making borehole, log of soil type and condition, depth of water in borehole, weather and temperature.

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MAHALAKSHMI INFRA PROJECTS