DEMOLITION OF RCC OVER HEAD TANK OF 68000 LITRES CAPACITY NEAR GTX PUMP HOUSE AND CONSTRUCTION OF RCC OVER HEAD TANK OF 68000 LITRES CAPACITY AND SPECIAL REPAIRS TO EXISTING SERVICE TANKS AT GTRE, BANGALORE

Amount

Consultancy services for condition survey and structural audit of RCC Over Head Tank of 02 Lakh Capacity of approximate height 21m at GTRE. The following shall be included in the scope. (a) Visual Inspection and Photography (b) Site testing (c) Chipping (d) Core testing (e) Reinforcement Mapping (f) Chemical tests as required (g) Determination of water soluble sulphates (h) Determination of water soluble chloride (j) Chloride profile test (k) Half Cell Potential (l) Carbonation (m) Slab/Beam deflection test (n) Moisture test (o) Identification of any settlement/ distress in foundation (o) Any other relavant tests which are required for assessing the structural stability (p) Submission of detailed scope of work including BOQ in respect of Rehabilitation/ Retrofitting if found required.

(q) Vetting of audit report by IIT/NIT/IISC/ Govt Engineering College (r) Submission of vetted structural audit report in 04 (four) sets. NOTE :- Necessary staging and other resources required for the tests shall be included in the scope.

a) Carrying out soil investigation at work site of project by drilling of bore holes of 150 mm dia upto 25 m depth and trial pits of size 1.2mx1.2mx3.0m at the location as per IS 1892-1979 (Reaffirmed 2002) , collecting samples of disturbed and undisturbed soil sample. Drilling for 20.0m depth inside the rock is essential to ensure that boulders or layers of cemented soil are not mistaken for rock and conducting test as per relevant and latest IS code as mentioned below:- b) Number of test Holes : i) Trial pit size 1.2x1.2x3.0m -1 No Details and Tests required : (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, dry density and degree of saturation of soil. (iii) Differential free swell index ("fa) & swelling pressure if expansive soil is encountered. (iv) Shear Parameters (C-Phi Analysis) and Consolidation test (for cohesive soil only)

(v) Chemical analysis of soil and ground water (Water to be obtained from bottom of the bore hole) Depth of water table below (vi) Presence of loose soil if any. 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 action to be adopted shall be soecified. (vii) Crushing strength, degree of weathering (CR Value) and RQD of rock samples

(viii) For calculation of Net SBC at 1.5m, 2.0m, 2.5m,3.0m upto 25.00m from shear as well as settlement criteria. SBC value shall be calculated based on C-Phi analysis as well as SPT value. For calculations, formulae given in IS 6402 shall be used or recommended depth of pile of different diameter etc shall be specified along with supporting calculations. Pile capacity in compression, uplift & lateral loads shall be oiven. (x) Recommendations regarding type of foundation to be adopted & net SBC/Pile capacities to be adopted Also recommendations shall be given reoardino stabilitv of soil and soil stabilization reauired. if anv. (xi) Bore log details duly marked on plan and their distance from adjacent prominent ref as per Appx D of IS 1892. N values depth wise shall also be shown in bore loo details (xii) SPT shall be done till N value of 50 or refusal whichever is earlier.Note : Following will be in scope of order and must be the part of final report :

a) Report shall be signed by a qualified engineer with degree in M tech having experience of minimum 02 Years. Then name and qualification of the signatorv shall be clearlv shown. b) Soil investigation consultant should have minimum 01 No ME/M Tech (Geo Tech) with 2 Year experience & 01 no BE/B Tech (Civ) with 5 Year Exoerience and must have all adeauate tech staff diDlOlTla/ITI Qualified. c) Labs must be NABL accredited or nay other accreditation body which operates in accordance with ISO/IEC-170011 and accredits the lab as per ISO/IEC:17025 with state of the art eauioment aooaratus. d) RL of the Ground level/Founding level with ref to a BM should invariably be mentioned in the test report. e) Recommendation of SBC should be given for :- The bore hole, Depths viz 1.5m, 2.0m and 2.5m upto 25 m (f) Photographic records of exploration as well as the testing shall be form the part of thr report. Also Soil or rock samples left out after tests shall be handed over to AGE B/R or Engr-in-Charge.

(g) Recommendation as regards possibility of liquidation of soil in case of saturated or partially saturated loose/uncompacted sandv soils. (h) Swelling index and swelling pressure in respect of black cotton soil and its depth/layer. (i) Depth of ground water table (GWT) in peak monsoon and peak summer (highest) after correlation of result with seasonal variation of water table in the station. (j) Recommendation for filler under floors and improvements of existing subsoil using proper soil stabilization methods or stabilization of soil underneath foundation systems.

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