reply of points rose during 254 meeting of seac,...

Reply of points rose during 254th Meeting of SEAC, U.P. held on 09.01.2016 for the

Expansion of Group Housing Project “Ammatra Homes”

at Plot No-GH-2C, Sector-10, Greater Noida, U.P

Submitted By

CONSULTANT

M/s. Nandi Infratech Pvt. Ltd.

Ascenso Enviro Pvt. Ltd. (Formerly known as Ascenso Management and Consulting Services

Pvt.Ltd.) A QCI Accredited Environmental Consulting Organization

Expansion of Group Housing project “Amaatra Homes” at Plot No-GH-2C, Sector-10, G.Noida, U.P

Consultant-Ascenso Enviro Pvt. Ltd. Page 1 of 9

Reply of points raised during 254th Meeting of Uttar Pradesh State Environmental Appraisal Committee, Held on 09.01.2016 for the

Expansion of Group Housing Project “Ammatra Homes” at Plot No. GH – 2C, Sector - 10, Greater Noida, Uttar Pradesh.

Point no.1: Make sure that there is no addition of floors to towers B, C, D, F & G. Reply: As per Environment Clearance letter 1936/Parya/SEAC/1683/2013/AA(S) dated 12th October 2013, the construction work is only done on towers B, C, D, F and G. There is no additional floor being added to these towers. As per EC letter the number of floors permitted for these towers is S+21 and construction till date for these towers is as follows:

Table-1: Status of construction till date

Name of Tower Number of floors Current status of construction

Tower B S+21 1st floor constructed

Tower C S+21 1st to 3rd floor constructed

Tower D S+21 1st to 7th floor constructed

Tower F S+21 1st to 15th floor constructed

Tower G S+21 1st to 13th floor constructed Point no.2: Submit the date of construction started to each tower on which the construction was started with proof as per competent authority intimation with photograph. Reply: The project received Environmental Clearance on 12th October 2013 vide reference number 1936/Parya/SEAC/1683/2013/AA(S) for existing phase. Copy of previous Environment Clearance letter is attached as Annexure-I.

The construction activity started on the project site from 12/12/2014. The Site Layout was approved in Year’2013 by Greater Noida Industrial Development Authority and sanctioned letter is attached as Annexure-II.

The Site Layout was again revised in Year’2014 by Greater Noida Industrial Development Authority Vide Letter No. PLG/ (BP)-3184/44/AS-7614 dated: 19/9/2014.Copy of approved layout along with the sanctioned letter is attached as Annexure-III.

The construction activity started after 12/12/2014 at site of Expansion of Group Housing Project “Ammatra Homes” located at Plot No. GH-2C, Sector 10, Greater Noida, District-



Gautam Budh Nagar, UP, M/s Nandi Infratech Pvt. Ltd., after getting the Structural Safety Certificate from Jamia Millia Islamia by Ziauddin Ahmad (Professor-Deptt.of Civil Engineering) dated: 25/06/2013 is attached as Annexure-IV. Structural certificate for newly proposed towers A, E, H, I and J along with earlier proposed towers B, C, D, F and G from Jamia Millia Islamia (Faculty of Engineering and Technology) by Dr. Khalid Moin (Professor-Deptt.of Civil Engineering) dated: 01/09/2014 is attached as Annexure-V and structural drawing of all towers is attached as Annexure- VI. The Affidavit stating the date of construction on each tower/block is attached as Annexure-VII.

Table-2: Date of construction of towers

Name of Tower Date of construction

Tower B 12/12/2014

Tower C 12/12/2014

Tower D 02/01/2015

Tower F 19/02/2015

Tower G 19/02/2015 Point no.3: Details regarding how much construction work have been done on the project proposal as per the Environment Clearance issued earlier for title project by the SEIAA vide its letter no. 1936 dated 12 Oct, 2013 as per its approved plan. Reply: For details of construction work as per the earlier Environment Clearance refer Point.no.1, Table no.1. Point no.4: The structure design certificate by qualified structure engineer should be submitted. IITs/CBRI should preferably vet the structural design certificate; date of certification should be visible. Provisions of alarm system, to timely notify the employees/residents, in case of occurrence of earthquake/other natural disasters/fire also of the date before construction was started should be provided and to that of revised plan. Reply: The construction activity started after 12/12/2014 at site of Expansion of Group Housing Project “Ammatar Homes” located at Plot No. GH-2C, Sector 10, Greater Noida, District-Gautam Budh Nagar, UP, M/s Nandi Infratech Pvt. Ltd., after getting the Structural Safety Certificate from Jamia Millia Islamia by Ziauddin Ahmad (Professor-Deptt.of Civil Engineering) dated: 25/06/2013 is attached as Annexure-IV. Structural certificate for newly proposed towers A, E, H, I and J along with earlier proposed towers B, C, D, F and G from Jamia Millia Islamia (Faculty of Engineering and Technology) by Dr. Khalid Moin (Professor-Deptt.of Civil Engineering) dated: 01/09/2014 is attached as Annexure-V.



Point no.5: Status of the construction till date. Reply: Refer Point no.1, Table no.1 for status of construction till date on the site. Point no.6: Submit layout plan along with the previous one. Reply: Layout plan approved by authority earlier is attached as Annexure-III whereas after the possession of extra 965 sq.m and increase in FAR (purchasable) layout plan was again approved by Greater Noida Authority. Revised layout plan is attached as Annexure-III. Point no.7: Submit the area statement chart along with the previous one and its comparative chart. Reply: A comparative area statement chart, clearly showing the differences in existing and expansion is as follows:

Table -3: Comparative details of existing and expansion S. No. Particulars Area in Sq. m.

Existing Expansion Total Comparison details 1 Total Plot Area 19,335.000 965 20,300.000 4.9% increase

2(a) Permissible Ground Coverage 6767.25 337.75 7105 4.9 % increase (b) Achieved Ground Coverage 3461.205 1175.941 4637.14 33.97% increase 3(a) Permissible FAR 53,171.250 2653.750 55,825.00 --- (b) Purchasable [email protected] ….. 15225 15,225.00 --- (c) Total permissible FAR (@3.5) 71,050.00 ---

4(a) Proposed FAR 51,153.300 19,894.106 71,047.40 38.89% increase 5 Total NON FAR Area 41,053.69 -13,376.983 27,676.70 32.58% decrease 6 Basement Floor Area-1 and 2 31,831.42 -15,029.214 16802.20 47.25% decrease 7 Stilt Area 2,462.016 102.034 2564.05 4.14% increase 8 Podium Area 6,760.253 1,550.197 8310.45 22.93% increase 9 Built up Area (FAR +Non- FAR) 97755.56 11,626.7 109382.25 11.89% increase

10 Total Open Area (Plot Area-Ground Coverage) 15873.795 -210.94 15662.85 1.3% decrease

11 Required Green Area (38.57% of plot area) 7936.898 -105.471 7831.42 1.3% decrease

12 Proposed Green Area (38.66% of plot area) 8034.999 -186.9990 7848.00 2.3% decrease

Point no.8: Submit on date photographs of all ten towers. Reply: A total of five towers (B, C, D, F and G) were proposed for which Environment Clearance has been obtained on 12th October 2013 vide reference number 1936/Parya/SEAC/1683/2013/AA(S). Construction has been done only on these towers



namely B, C, D, F and G. No construction work has begun on newly proposed towers namely, A, E, H, I and J. Photographs of these five towers (B, C, D, F and G) as on date is attached as Annexure-VIII Point no.9: No additional unit in any towers as construction started is to be permitted in old approved map and EC issued. Reply: There is no addition to the existing towers as per approved earlier maps and EC issued. Point no.10: Structural design must specify the date of approval by the competent Authority and construction all started only after the approval of Competent Authority with photographs as proof. Reply: For details of structural stability certificates and structural drawings please refer Point.no.4. Point no.11: What is the type of extra FAR – Compounded / purchasable? Please clarify. Where is this extra FAR being used? Reply: The FAR used is purchasable FAR which is being used on towers that are newly proposed as well as new three floors proposed in existing towers at the site. Point no.12: Please provide structural safety certificate submitted with previously granted EC and present proposal (with proposed expansion) Reply: For details of structural stability certificates and structural drawings please refer Point.no.4. Point no.13: Please provide a comparison of “maximum load bearing capacity” of building plans submitted with previously granted EC and present proposal (with proposed expansion). Reply: Geo technical investigation was done in the year’2012.The load bearing capacity got calculated before sanction of plans in year’2013. The load bearing capacity is taken for the soil for complete project and will remain same during the execution of work for all towers. Geo- technical Report is attached as Annexure-IX. Point no.14: Please provide the present status of construction, and tower-wise construction starting date, supported by documents signed by competent authority. Reply: For present construction status and tower wise construction at the site refer Point no.1, Table-1



Point no.15: The applicant shall submit a clarification on the following: the construction carried out till date is as per details and design of previously granted EC or proposed EC (with modified design and building plan). Reply: The project received Environmental Clearance on 12th October 2013 vide reference number 1936/Parya/SEAC/1683/2013/AA(S) for existing phase and construction work is being done on earlier received EC letter. Copy of previous Environment Clearance letter is attached as Annexure-I. Point no.16: If it is as per previously granted EC then point-wise definite compliance of its specific conditions should be submitted by applicant. Reply: Compliance of Environmental Clearance conditions (Specific) as mentioned in the Environmental clearance letter issued vide letter number 1936/Parya/SEAC/1683/2013/AA(S) dated 12-10-2013 is as follows:

S. No. SPECIFIC CONDITIONS COMPLIANCE

1.

Digging of basement shall be undertaken in view of structural safety of adjacent buildings under information/consultation with District Administration/Mining Department.

Basement digging was done before December 2014 before the start of construction at the site. Relevant pages giving details of basement digging at the site keeping in view the structural stability is attached as Annexure-X.

2. During the construction phase wheel wash arrangement shall be provided at all exit points of the site.

The condition shall be followed.

3. LIG and EWS housing to be provided as per Ghaziabad Development Authority Norms.

There is no provision of LIG and EWS as per Greater Noida Development Authority building bye-laws.

4.

Green belt design along the periphery of the plot shall achieve attenuation factor conforming to the day and night noise standards prescribed for residential area. The open spaces inside the plot should be landscaped and covered with grass and shrubs.

Green belt designing will be done as per the approved landscape plan. The construction is still in progress at the site. After the construction work is completed open spaces shall be suitably landscaped and covered with grass and shrubs.

5.

Green belt should be developed as per CPCB norms. 50% evergreen tree (that remains green for most part of the year and sheds leave slowly throughout the year having height more than 2m, with well distinguished trunk) should be part of the green belt.

Green belt will be designed as per CPCB norms and approved landscape plan.

6. The minimum height of plantation of sapling should be 3.6 m at the time of occupancy.

The project is in still in construction phase. Plantation of sapling will be done as per norms during the occupancy.

7. Pavements shall be so constructed as Permeable pavements will be constructed to



to allow infiltration of surface run off of rain water. Construction of pavements around trees should be able to facilitate suitable watering, aeration and nutrition to the tree.

facilitate infiltration of surface runoff of water. The pavement will be constructed around trees to provide suitable watering, aeration and nutrition to trees.

8. Ready mix concrete and sprinkler to be used for curing and quenching during construction phase.

The concrete used for construction purpose is being purchased from outside and is ready mix type.

9.

Environmental Corporate Responsibility (ECR) plan along with budgetary provision amounting to 2% of total project cost shall be submitted (within a month) on need base assessment study in the study area. Income generating measures which can help in up liftment of weaker section of society consistent with traditional skills of the people identified. The program can include activities such as old age homes, rain water harvesting provisions in nearby areas, development of fodder farm, fruit bearing orchards, vocational training etc. In addition, vocational training for individuals shall be imparted so that poor section of society can take up self-employment and jobs. Separate budget for community development activities and income generating programmers shall be specified.

The condition shall be followed as and when construction gains speed at the site.

10.

100% provision of Rain Water Harvesting is to be made as per CGWB designs. Initially RWH shall be done only from the roof top. RWH from green and other open areas shall be done only after permission from CGWB.

The rain water harvesting pits shall be designed as per guidelines of CGWB. It will be taken care that rain water is harvested only from roof-top. In case there is need for harvesting rain water from green and open areas, prior permission from CGWB shall be taken.

11. Dedicated guest parking at surface/stilt should be provided.

Guest parking will be provided as per norms during the operation phase of the project.

12.

Manure generated from STP/organic waste converter shall be used in house and plan for management of surplus be submitted within three months.

The project is still in construction phase and STP construction has not yet started at the site. Once the STP is constructed and becomes operational during the occupancy of the project, the manure generated will be used in-house. The plan for management of surplus manure will be submitted as an when the stage is reached.



13.

Use of LEDs should be ensured in place of CFL. Solar light is to be provided in the common areas with 50% of them may be with dual power.

Use of LEDs and Solar lighting system shall be explored during the operational phase of the project.

14. Motion sensor based lights to be provided in parking areas, corridors, passages, aisles, stairways.

This option will be explored during the operational phase of the project.

15. Photoelectric lighting should be provided on all the open areas/roads.

This option shall be explored during the operational phase of the project.

16.

All internal and peripheral roads should be minimum 9 m wide and all entry and exit should be bell mouth shaped.

The internal and peripheral roads will be 9 meter as per the plans approved by the Greater Noida Authority.

17. ECS as to be provided as per NOIDA bye laws@ 1 ECS/80 m2

Parking provision will be as per bye laws.

18.

STP to be constructed during construction phase.100% waste water is to be treated in STP conforming to prescribe standards of receiving body or designated use. Monitoring of STP to be done weekly till its stabilizations then monthly. The excess treated waste water after in house use may be given to nearby builders for construction or discharge into public drainage system/drains after permission from the competent authority.

At present mobile STP is being used at the site. Construction of STP for treatment of waste water shall be done during the operational phase of the project.

19.

Stack height should be calculated based on combined gensets capacity and shall be higher than the tallest building in the project.

Construction work is going at the site

20.

The top soil generated during basement construction will be properly preserved and used for plantation and green area development.

Top soil generated during the excavation of basement is properly preserved at the site itself and is being used in landscaping.

21.

The total excavated will be completely utilized at project site for leveling and back filling or landscaping. In case of surplus excavated soil its management in eco-friendly manner be drawn and submitted within three months.

The excavated soil at the site will be utilized within the site for landscaping purposes.

22. Creche to be provided during the construction and operation phase.

The condition shall be followed.

23. Provision of separate dedicated room to be made for senior citizen

The condition shall be taken into consideration during the operational phase of the project.



commensurate with proper amenities (TV, music system, indoor games, etc) for end user in and around club house.

24.

E-waste shall be managed as per e-waste Management and Handling Rules 2011. Temporary storage at secure place is made till it is given to recycler approved by CPCB.

E-waste generated will be negligible in amount as it is Group Housing Project. The generated E-waste will be however disposed off as per e- waste Management and Handling Rules 2011.

25.

A temporary separate and isolated MSW storage and transfer room should be provided at least for two days in a manner to avoid generation of foul smell.

The condition shall be taken care during the operational phase of the project.

26.

Ground water should not be extracted for the purpose of construction or otherwise. In case of default The Environmental Clearance will deem to be cancelled.

No ground water is being used/extracted for the purpose of construction activity.

27.

Post project monitoring for air, water (surface + ground), stack (including CO and HC) noise, and STP to be carried out as CPCB guidelines

Monitoring is being carried out at the site at regular intervals of 6 months.

28. Adequate ventilation arrangement for the basement shall be provided along with installation of CO monitors.

When the project will become operational, it will be taken care to install adequate ventilation system.

29. The basement should be constructed in consultation with CGWB to avoid infringement of water table.

There is no infringement to water table during the construction of basement for the project.

30.

Project falling within 10 km area of wildlife sanctuary is to obtain a clearance from National Board Wild Life (NBWL) even if the eco sensitive zone is not earmarked.

No eco sensitive zone lies within 10 km of the project area. Therefore there is no need to obtain clearance from National Board Wild Life (NBWL)

31.

The project proponent to ensure that buffer zone of no activity/development as declared/identified under any law does not fall around project boundary

No buffer zone of no activity/development as declared/identified under law falls within the project site.

32.

No wetland should be infringed during construction and operation phases. Any wetland/ponds within the project area as per revenue records if any should be protected and brought to the notice of forest department/ SEIAA for directions.

No wetland is being infringed during the construction of this project.

33. Project proponent should procure all the regulatory clearances and

All regulatory clearances such as NOC from Airport Authority of India, NOC from Fire



completion certificate from the development authority before handing over the possession of dwellings to residents.

Department, Consent to Establish from Pollution Control Board has been obtained. Consent to Operate shall also be obtained from Pollution Control Board before handing over the possession of dwellings to the residents.

34.

Swimming pool to be maintained as per WHO norms in terms of make-up water, COC for water and disinfection.

Swimming pool has still not been constructed at the site. The construction work is in progress at the site. Whenever the swimming pool is constructed and is in operation, proper care shall be taken as per WHO norms in terms of make water and disinfection.

Point no.17: If it is as per proposed EC (with modified design and building plan) then a justification should be submitted by applicant that why it shall not be considered as VIOLATION case. Reply: The project received Environmental Clearance on 12th October 2013 vide reference number 1936/Parya/SEAC/1683/2013/AA(S) for existing phase and construction work is being done on earlier received EC letter. Copy of previous Environment Clearance letter is attached as Annexure-I.

pc

Typewritten Text

Annexure-I

pc

Typewritten Text

Annexure-II

pc

Typewritten Text

pc

Typewritten Text

pc

Typewritten Text

Annexure-III

pc

Typewritten Text

Annexure-IV

pc

Typewritten Text

Annexure-V

pc

Typewritten Text

Annexure-VI

\

E

ffirbhrr urrAR PRADEsHAFFIDAVIT

I, Bharat Kalra, Authorized Signatory of M/s Nandi Infratech Pvt. Ltd having their registered office

at A-6,Basement Yojna Vihar Delhi, I 1OO92,do solemnly affirm and declare that:

The construction activity started at the site of Expansion of Group Housing project "Amaatra

Homes" at Plot No-GH-2C, Sector-10, G.Noida,U.P, M/s Nandi Infratech Pvt Ltd. after getting

Structural Safety Certificate from Jamia Millia Islamia (Faculty of Engineering and Technology)

dated 01/09/2014 and getting drawings approved from Greater Noida Industrial Development

Authority (GNIDA) and further obtaining Envir,.'nmental Clearance and subsequent Consent to

Establish from competent authorities in line of requirement to start construction activity at the Project

Site which is being developed by M/s Nandi Infratech Prt. Ltd. Start date of construction on each

block given in below table:-

Name of Tower Date of construction

Tower B 12t12t20t4

Tower C t21t212014

Tower D 02/01/201s

Tower F t9/02/201s

Tower G 19t02t2015

DEPONENT

knowledge and

DEPONENT'

BA 985551

pc

Typewritten Text

Annexure-VII

TOWER- B

01.02.2016

pc

Typewritten Text

Annexure-VIII

TOWER-C

01.02.2016

TOWER-D

01.02.2016

TOWER-F and G

01.02.2016

REPORT ON GEOTECHNICAL INVESTIGATION

FOR

AMAATRA HOMES AT PLOT NO.- GH-02C, SECTOR- 10,

GREATER NOIDA (WEST)

Submitted to: M/S NANDI INFRATECH PVT. LTD.

NOIDA

By

B K SOIL CONSULTANTS PVT. LTD. 980 SECTOR-3, VASUNDHARA, GHAZIABAD

PHONE: 0120-4116008, 9312942241 e-mail address: [email protected]

pc

Typewritten Text

Annexure-IX

B K SOIL CONSULTANTS PVT. LTD.

TABLE OF CONTENTS

TITLE SHEET

NO

1.0 INTRODUCTION 1

1.1 Project Description 1

1.2 Purpose of Study 1

2.0 FIELD INVESTIGATION 1

2.1 Soil Boring 2

3.0 LABORATORY TESTING 3

4.0 GENERAL SITE CONDITIONS 3

4.1 Site Stratigraphy 3

4.2 Ground Water 3

5.0 FOUNDATION ANALYSIS AND RECOMMANDATIONS 4

5.1 General 4

5.2 Foundation Type 4

5.3 Square Footing 5

5.4 Raft Foundation 6

6.0 SUMMARY OF PRINCIPAL FINDINGS 7

7.0 CLOSURE 7

Records Of Boring 8-19

Graph of N Values 20-25

Soil Profile

calculation

site plan

26-37

38-41

42

B K SOIL CONSULTANTS PVT LTD SHEET NO 1

1.0

INTRODUCTION

1.1 Project Description

M/S NANDI INFRATECH PVT LTD are constructing a building at

Amaatra Homes at Plot No.- GH-02C, Sector- 10, Greater Noida

(West). For this purpose, the work of soil investigation has been

awarded to B K SOIL CONSULTANTS PVT LTD, 980 Sector-3,

Vasundhara, Ghaziabad by M/S NANDI INFRATECH PVT LTD.

The report Presented hereunder, deals with the test results and

their interpretation, estimation of safe allowable bearing capacity

and recommendation, regarding the type, size and shape of

foundation which may be provided for the proposed structure.

1.2 Purpose of Study

The purposes of this study were to evaluate the subsurface

stratigraphy so as to develop recommendations for foundation

design and construction. To accomplish these purposes, the

study was conducted in the following phase:

i

ii

iii

iv

v

Drilling of six boreholes to 30.00m depth below existing ground

level.

Conducting standard penetration test in the bore holes.

Collecting disturbed and undisturbed soil samples.

Testing of soil samples collected from bore holes in the laboratory.

Preparing this technical report with foundation design and

recommendations.

Test location was marked by us in the field and approved by

client.


2.0

FIELD INVESTIGATION

2.1 Soil Boring

Bore holes in soil were advanced manually using auger. The

diameter of bore holes were approximately 150 mm. The boring

procedure was in accordance with IS 1892. Standard penetration

tests (SPT) were conducted in the bore holes. A split spoon

sampler of 50mm diameter was connected to 'A' rod and driven it

by 45 cm a 65 kg hammer falling freely from a height of 75 cms.

The test procedure was in general accordance with IS : 2131.

The number from each 15cm of sampler penetration was

recorded. The blows required to penetrate the last 30 cm of the 45

cm sampling interval is termed the SPT value of the 'N' value. The

'N' values are presented on the soil profiles for each boring.

Where very dense/hard material was encountered, the

penetration of the sampler after the initial 15 cm seating is

recorded for the total of 75 blows. An SPT value exceeding 75

blows for 30 cm or 25 blows for 2.5 cm penetration of this split

spoon sampler is considered as refusal. Refusal is also said to

have occurred if the bore holes can not be progressed further in

hard soils by manual methods.

Disturbed samples were collected from the split spoon after

conducting SPT. The samples are preserved in transparent

polythene bags. UDS were collected by driving 75 mm diameter

thin walled tubes using a 65 kg hammer in accordance with IS :

2132. The tubes are sealed with wax at both ends to minimize

loss of moisture. All samples were transported to our laboratory

for further examination and testing.


3.0

LABORATORY TESTS

The laboratory testing program was aimed at verify the field

classification and developing perimeters for engineering analysis. All

testing were performed in accordance with relevant IS specification.

The following tests were performed on selected soil samples recovered

from the bore holes.

i

ii

iii

iv

v

Grain size analysis

Natural moisture content

Bulk density

Shear test

Atterberg limits

4.0

GENERAL SITE CONDITIONS

4.1 Site Stratigraphy

Based on our investigation in field and laboratory, it is revealed that

the soils at site are alluvial and comprise silty fine sand and sandy

silt primarily. The top about 4.50m thick layer is sandy silt of low

plasticity and may be classified as ML. The soils from 4.50m to

30.00m depth are silty fine sand and may be classified as SM.

Based on standard penetration test, the soils are medium dense to

dense below ground level to final explored depth 30.00m by nature.

4.2

Ground Water

Based on our measurement in the completed borehole, the ground

water has been encountered at 8.50m from the ground level at the

time of our investigation in the completed boreholes up to 30m

depth. Fluctuation may takes place due to surface evaporation

rates and variation in seasonal rainfall.


5.0

FOUNDATION ANALYSIS AND RECOMMENDATIONS

5.1 General

A suitable foundation for any structure should satisfy two basic

and independent criteria with regard to the performance of the

underlying soils. Firstly, the soils should have adequate shear

strength to support the superimposed loads so that there is an

adequate safety factor against the bearing capacity.

Secondly, the settlement of the soils including immediate elastic

settlement and long term’s consolidation settlements should be

within tolerable limits for the structure. The net allowable bearing

pressure on the foundations should be taken as the lower of the

two values obtained from these two criteria. We believe that

foundation designed in accordance with these recommendations

given in this report will satisfy criteria.

5.2 Foundation Type

In general light to medium loaded structures may bear on isolated

square and strip footing & heavy loaded structure may bear on

raft foundation or pile foundation.

Detailed recommendations each of those foundation schemes are

given in the following sections. In our case the structure is a

medium to heavy loaded and stratum is medium dense so

following type of foundation may be adopted.

1. Isolated square footing bearing at 5.00m to 8.00m depth below

ground level.

2. Raft foundation bearing at 9.00m to 10.00m depth below

ground level.


5.3

Isolated Square Footing

Isolated square footing is a feasible foundation scheme.

Considering the presence of medium dense soils, we recommend

a foundation depth of 5.00m below the ground surface. In order to

limit differential settlement, we suggest that a plinth beam

interconnecting the foundation be provided. Bearing capacity

analysis for the shallow square footing is in accordance with IS:

6403-1981. Shearing stress of soil is used 0.0 kg/cm2 and an

angle of internal friction of 250 has been used in our analysis.

Considering the potential rise in ground water level, which is

presently, encountered at 8.50m depth at the time of our

investigation, a water table correction factor of 0.5 has been

considered. A safety factor of 2.5 has been considered in the

analysis as per IS: 1904.

Settlement analysis has been performed in accordance with IS:

8009 part -I. For computation of foundation settlement an average

lower bound corrected ‘N’ value has been used.

A tolerable total settlement of 50mm has been considered as per

IS: 1904. We recommend that an RCC plinth been be provided to

keep differential settlement within tolerable limits. The following

are our recommended values for square footing at a depth of

5.00m to 10.00m from existing ground surface.

Type of footing

Foundation

depth in m

Recommended value of net SBC

t/m2

Square 5.00 13.2

Square 8.00 15.2


5.4

Raft Foundation

Raft foundations are an alternative foundation scheme. Rafts are

expected to bear at a depth of 5.00m below the existing ground

level ground surface. The raft should be made sufficiently thick

and designed as a rigid foundation. The raft may be designed as

an inverted T-beam and slab system. Bending stress across the

raft should be checked in order to ensure that these are within

tolerable limit. However due to presence of medium dense soils

the allowable bearing pressure on the raft to be limited in order

that the total and differential settlements are within the tolerable

limits. IS: 1904 recommends that raft may be designed for a

tolerable total settlement of 75mm.

Bearing capacity analysis for raft foundation is in accordance with

IS: 6403-1981. Settlement analysis has been performed in

accordance with IS: 8009 part I.

For computation of foundation settlement an average lower bound

corrected ‘N’ value has been used. Water table correction factor

of 0.5 is used. Accordingly factor of safety of 2.5 has been used.

We recommend that raft foundation bearing at 9.00m for a net

allowable bearing pressure of 23.1 t/m2 and at 10.00m for a net

allowable bearing pressure of 26.8 t/m2. Total settlement of raft

foundation designed for the recommended bearing pressure is

expected to be less than 75mm.The raft should be designed for a

differential settlement of 20mm from one edge to another.


6.0

SUMMARY OF PRINCIPAL FINDINGS

B K SOIL CONSULTANTS PVT LTD carried out ten bore holes to

30.00m depth and and laboratory tests for proposed site at Amaatra

Homes at Plot No.- GH-02C, Sector- 10, Greater Noida (West) for M/S

NANDI INFRATECH PVT LTD. Based on our investigation in field and

laboratory, it is revealed that the soils at site are alluvial and comprise silty

fine sand and sandy silt primarily. The top about 4.50m thick layer is

sandy silt of low plasticity and may be classified as ML. The soils from

4.50m to 30.00m depth are silty fine sand and may be classified as SM.

Based on standard penetration test, the soils are medium dense to dense

below ground level to final explored depth 30.00m by nature. The ground

water table has been encountered at 8.50m depth at the time of our

investigation. Following are the foundation recommendations and net safe

bearing capacity of soil.

Foundation type Depth of foundation Recommended net SBC

Isolated square 5.00m 13.2 t/m2

Isolated square 8.00m 15.2 t/m2

Raft foundation 9.00m 23.1 t/m2

Raft foundation 10.00m 26.8 t/m2

MODULUS OF SUBGRADE REACTION: modulus of subgrade

reaction may be used 4.5 kg/cm3 for designe of raft.

LIQUEFACTION: soils are cohesionless below 4.50m depth and dry up

to 8.50m depth and medium dense to dense in conditions so

liquefaction may not take place.

7.0 CLOSURE

We appreciate the opportunity given to us to submit this report. Please

contact us if you need any clarification.

For B K SOIL CONSULTANTS PVT LTD

(Er B K SINGHAL)

pc

Typewritten Text

Annexure-X

reply of points rose during 254 meeting of seac,...

Documents