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Client Name : BASF India Limited

Project Name : Project GIR

Project Number : G3IR

cument No.: G3IR-0000-10-SP-9004-R1

Date 06 Mar 2012

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SITE PREPARATION, EXCAVATION AND BACKFILLING SPECIFICATION

G3IR-0000-10-SP-9004_R1

Project Document No:G3IR-000010-SP9004

Unit: General

Discipline: Civil Structural Architectural

Document Type: Specification

DOCUMENT TITLE:SITE PREPARATION, EXCAVATION AND BACKFILL SPECIFICATION

1 06 Mar 2012 ISSUED FOR DESIGN NB AK VP

0 17 Feb 2012 ISSUED FOR REVIEW NB AK VP

Fluor BASFRevision Date Purpose Prepared By Checked By

Approved By

VPBy NISHANT BHATIA on Mar 06, 2012 By Ajit Kadam on Mar 06, 2012

ISSUED FOR DESIGN

06 Mar 2012

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Record of Revisions

This specification has been revised as indicated below and described in the revision record on the following page.Please destroy all previous revisions.

Revision

No.

Date Description

0 17 Feb 2011 ISSUED FOR REVIEW

1 06 Mar 2011 ISSUED FOR DESIGN

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1 INTRODUCTION

1.1 Purpose

This Specification provides the requirements for site preparation, excavation, and backfill.

1.2 Scope

This Specification describes the requirements for excavation, placement, inspection, and

management of earthen and organic materials during the site preparation, excavation, and backfillphase of a construction project.

Any conflicts or inconsistencies between this specification, construction drawings, or othercontract documents, most onerous shall apply and it shall be brought to the attention of the buyerfor resolution.

2 REFERENCES

Applicable parts of the following industry codes and standards, and references shall be considered anintegral part of this Specification. The edition in effect on the date of contract award shall be used, exceptas otherwise noted. Short titles are used herein where appropriate.

2.1 Industry Codes and Standards

IS 1200 Methods of measurement of building and civilengineering works (All Applicable Parts)

IS 2720Methods of Test of Soil : (All Applicable Parts)

IS 10379 Code of Practice for Field Control of moisture andcompaction of Soils for embankment and subgrade

IS 3764 Excavation Work - Code of Safety

IS 4081 Safety code for blasting and related drilling.

IS 4082 Recommendations on stacking and storage ofconstruction materials and components at site

2.2 Government Regulations

Codes and Regulation by state or local agencies that have jurisdiction, where the

work is to be performed, shall apply.

2.3 Project Specifications:

G2IR000010SP9001 : Civil Design Criteria G2IR000015SP9001 : Structural Design Criteria G3IR-0000-10-SP-9004 : Site Preparation, Excavation And Backfill Specification

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3 DEFINITIONS

Contractor:The party responsible for supplying the materials, equipment, tools, supervision andlabor for the construction of roads in accordance with the contract documents. Unless otherwisenoted, the term contractor shall apply also to the contractors subcontractor(s) and vendor(s).

Contract documents: Any and all documents, including codes, studies, design drawings,

specifications, sketches, practices, and data sheets, that the purchaser or engineer of Record hastransmitted or otherwise communicated, either by incorporation or reference and made part of thelegal contract agreement or purchase order between the purchaser and the contractor.

Engineer of record:Purchasers authorized representative with overall authority and responsibilityfor the engineering design, quality, and performance of the civil works, structure, foundations,materials, and appurtenances described in the contract documents. The engineer of record shall beregistered as defined by the laws of the locality in which the work is to be constructed, and bequalified to specification in the specialty discipline required for the work described in the contract

documents.

Contract documents: Any and all documents, including design drawings, that purchaser orengineer of record has transmitted or otherwise communicated, either by incorporation or byreference, and made part of the legal contract agreement or purchase order between the purchaserand the contractor

Owner:The party who has authority through ownership, lease, or other legal agreement over the

project site

Purchaser:The party who awards the contract to the contractor. The purchaser may be the owner

or the owners authorized agent.

contractor:The party responsible for supplying the materials, equipment, tools, supervision, andlabor for performing site preparation, excavation, fill, and backfill in accordance with the contractdocuments. Unless otherwise noted, the term contractor shall apply also to the contractorssubcontractor(s) and vendor(s).

4 REQUIREMENTS

4.1 General

4.1.1 Quality Control

4.1.1.1 General

1. Unless otherwise specified in the contract documents, a quality control(QC) program shall be instituted that will verify or ensure that the workperformed under the contract meets the requirements of this

Specification and the contract documents.

2. Unless otherwise specified in the contract documents, as part of the QCprogram, a qualified independent inspection/testing shall be retained to

perform the work identified in Sections 4.1.1.3 and 4.1.1.4 of thisSpecification. The name and qualifications of the proposed

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inspection/testing firm(s) shall be submitted along with the contractorsproposal for purchasers approval.

3. During construction, the purchaser shall have access to all thecontractors facilities and records for the purpose of conducting

performance inspection/audits.

4. During an audit by the purchaser, any inspection and test reports, and/orengineering analyses and calculations associated with the scope of workshall be provided upon request.

4.1.1.2 Surveying

1. After starting from horizontal and vertical control furnished by thepurchaser, all lines and grades shall be provided by the contractor forcontractors operations.

2. The contractor shall be solely responsible for the accuracy of surveywork performed.

4.1.1.3 Inspection

1. The inspection/testing firm required in Section 4.1.1.1(2) shall beresponsible for QC inspection and testing to ensure that the work meetsthe requirements of this Specification and the contract documents.

2. The inspection/testing firm shall perform tests as outlined in Section4.1.1.4 or as otherwise specified in the contract documents.

3. If the purchaser furnishes the testing and inspection, the contractor shallnot be relieved of the responsibility to meet all requirements of thisSpecification and the contract documents.

4. If completed work is not in accordance with this Specification, thecontractor shall be responsible for repairing or reconstructing thedeficiencies to meet this Specification and the other contract

documents.

4.1.1.4 Testing

1. Tests of gradation, plasticity, density, and moisture content shall beperformed for each type of fill material. These tests shall include the

following:

a. One standard sieve analysis in accordance with IS 2720, Part-4.

b. One liquid and plastic limit determination in accordance with IS

2720, Part-5.

c. The dry density against moisture content plot and values ofmaximum dry density and optimum moisture content obtained inaccordance with IS 2720-Part 7 or Part 8.

2. For granular soils that do not exhibit a well-defined moisture-densityrelationship, index density, unit weight, and relative density shall bedetermined in accordance with IS 2720-Part 14.

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3. If the type or the sources of fill material changes, the control tests shallbe performed again with the new material.

4. Unless otherwise specified in the contract documents, the following in-place dry density and moisture content testing (i.e., field density testing)

on compacted fill shall be performed using one of the followingmethods:

a. Sand-replacement method in accordance with IS 2720, Part 28

b. Rubber balloon method in accordance with IS 2720, Part 34

c. Core-cutter method in accordance with IS 2720, Part 295. Unless otherwise specified in the contract documents, the field density

testing shall be performed at the following frequencies:

a. Structural fills under foundations and building slabs one testevery 90 square m of each lift

b. Structural fill under roadways, railroads, area pavement and

parking areas one test every 180 square m of each lift

c. Road base and sub-base one test every 180 square m of each lift

d. Backfill of trenches (for utility lines or foundations) one test forevery 15m of each lift

e. General fills one test every 460 square m of each lift

6. As a minimum, one in-place moisture content and one dry density testshall be performed on every lift of fill.

7. Until the required dry density has been achieved, further placement offill shall not be permitted.

8. The number of field density tests shall be increased if a visualinspection determines that the moisture content is not uniform or if thecompacting effort is variable and not considered sufficient to attain thespecified dry density.

9. The engineer of record may approve a decrease in the number of tests

once a compaction procedure has met project requirements.

4.1.1.5 Protection

1. Temporary fences, guardrails, barricades, lights, and other protectivemeasures required for the safety of personnel and the premises shall beinstalled and maintained in good condition.

2. All reference points (e.g., property markers, benchmarks, etc.) shall becarefully maintained during excavation, backfilling, compaction, and

earthwork.

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3. If a reference point is damaged during performance of the work, thereference point shall be repaired or replaced at the contractors expense

in accordance with the requirements of the owner.

4. Unless otherwise specified, before earthwork begins, the purchaser shalllocate and mark all known utilities within the project limits or notethem in the contract documents.

5. If other utility locations become evident as earthwork progresses, workstoppages may be required until utilities are identified and until theowner provides specific direction.

6. During earthwork, all necessary precautions shall be taken to protect

and preserve utilities scheduled to remain. If preservation andprotection are impractical, temporary service lines shall be installedwith owners approval.

7. Bracing and shoring shall be used to protect excavations adjacent toexisting underground installations (e.g., foundations, piping manholes,electrical, and duct banks) and personnel engaged in excavationactivities during construction.

8. Unless otherwise shown in the contract documents, excavation underfoundations shall not be permitted.

9. The contractor shall be responsible for avoiding damage to andpreserving trees, shrubs, and all other vegetation in the areas beyond the

designated excavation area.

10. Any damage to existing structure, utility lines, or graded areas causedby erosion shall be repaired to the original condition at no cost to thepurchaser. This includes areas that are seeded until such time that the

vegetation prevents erosion.

11. During the performance of the work, the contractor shall take properand efficient measures to reduce dust and to prevent dust from harming

individuals and damaging adjacent properties and equipment.

12. Any damage caused to adjacent property during the constructionactivity shall be repaired or replaced or compensated appropriately atthe contractors expense to the owners satisfaction.

4.1.2 Submittals

4.1.2.1 The testing/inspection firm shall provide the following submittals to the purchaserand contractor:

a. A statement attesting that the contractors work is in accordance withthe requirements of this Specification and the contract documents

b. Informal daily pass or fail reports

c. Formal weekly reports including all test logs and comments. Theseformal reports shall include density and moisture content test logs,indicating location of tests by coordinates and elevation and anyappropriate comments.

d. At earthwork completion, all density and moisture content test logs andcomments compiled and submitted for permanent project records

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e. Sources and test results of all borrow materials used for fill

4.1.2.2 The contractor shall provide the following submittals to the purchaser. Data shallinclude horizontal dimensions, elevations, size, and slope gradients, as appropriatefor the utility and as required by the purchaser:

a. Accurately recorded as-built locations of project-installed undergroundutilities

b. Tie-in points/interferences encountered during project construction

4.1.2.3 If excavation bracing (i.e., shoring and sheeting) is required, the contractor shallprovide the following submittals to the purchaser:

a. Plans, sketches, and/or details

b. Supporting calculations prepared by a qualified engineer

c. Description of the materials and shoring system to be used

d. Indication of whether any components will remain after filling orbackfilling

e. Indication of the sequence and method of installation

4.1.2.4 If dewatering of an excavation is required, the contractor shall submit proposedmethods and details to the purchaser for review before beginning excavation.

4.1.2.5 If required by an authority having jurisdiction, the contractor shall provide a soilerosion control plan and/or a storm water runoff pollution prevention plan. The plansshall be provided to the purchaser and the appropriate authority.

4.1.3 Environmental

4.1.3.1 Contaminated Soils

1. Known contaminated soils within the construction limits shall bemanaged in accordance with a contaminated soil management plan

provided by the owner before the start of excavation.

2. If unexpected soil contamination is encountered during the work, the

work shall be stopped and the owner shall be notified immediately.

4.1.3.2 Erosion/Sediment Control

1. All procedures and work shall be in accordance with local and stateGovernment regulations.

2. All areas shall be maintained using temporary erosion and sedimentcontrol measures during construction until the contractor is relieved bythe purchaser or until permanent measures are completed andfunctioning in a satisfactory manner.

4.1.4 Safety

4.1.4.1 General

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1. All work shall be in accordance with IS 3764 for excavation and anyother applicable state and local codes and with any safety requirements

of the owner.

2. Unless otherwise specified in the contract documents, a work permitshall be obtained from the owner before performing any earthwork.

.

4.1.5 Clean Up

4.1.5.1 Soil that is spilled or washed onto paved areas or streets shall be removed daily fromthe surface.

4.1.5.2 Soil that is spilled or washed into drains pipes, gutters, or ditches or onto adjacentproperty shall be removed daily. Contractor shall provide measures to preventrecurrence.

4.2 Materials Fill and Backfill

4.2.1 Basic Requirements

4.2.1.1 Unless otherwise specified in the contract documents, fill and backfill materials shallbe from either on-site excavation, designated borrow areas, or off-site sources inaccordance with the requirements of Sections 4.2.1.3, 4.2.2, and 4.2.3.

4.2.1.2 In No-case top 300mm depth excavated soil shall be dumped within the plot or usedfor backfilling. All the excavated material to be used as backfilling material shall be

approved by owner.

4.2.1.3 All borrow material and all supply sources shall be approved by the owner.4.2.1.4 Fill and backfill shall contain no rocks or stones larger than 75 mm in any dimension

and shall be free of but not limited to organic matter, trash, chunks of highly plasticclay, contamination, or other unsatisfactory material.

4.2.1.5 Liquid limit and plastic limit shall be determined in accordance with IS2720, Part-5.4.2.2 General Fill and Backfill Material

4.2.2.1 General Fill Type 1 Fill material from borrow pits / source approved by owner,away from site.

4.2.2.2 General Fill Type 2 Fill material excavated within the plot boundary.Fill and backfill to be used as general fill shall be material capable of beingcompacted to the requirements of 4.3.7.7 (2).

4.2.3 Structural Fill Material

4.2.3.1 Fill and backfill to be used as structural fill shall be gravel, sand, clay, or silt, or amixture of these constituents.

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4.2.3.2 Except for sands or gravels that exhibit no plasticity characteristics, the structural fillmaterial shall be in accordance with the following requirements:

a. Liquid limit 35maximum

b. Plasticity index 6 to 15

4.3 Construction

4.3.1 Site Preparation

4.3.1.1 Clearing and Grubbing

1. Clearing and grubbing shall consist of the removal and satisfactorydisposal of trees, stumps, roots, vegetation, logs, rubbish, and otherunsuitable material.

2. Except for trees and shrubs in areas designated in the contractdocuments for preservation, areas designated for clearing and grubbing

shall be cleared.

3. During construction operations, trees, shrubs, and other landscapefeatures specifically designated in the contract documents for

preservation shall be carefully protected from abuse, marring, ordamage.

4. Trees and other vegetation outside the construction area shall not bedamaged in any manner.

5. Unless otherwise specified in the contract documents, trees, stumps, andother vegetation in the areas designated for clearing and grubbing shallbe removed to the bottom of their root zone.

6. Depressions made by clearing and grubbing operations shall be filledwith suitable material and compacted to conform to the adjacent surfaceof the original ground.

4.3.1.2 Stripping

1. Stripping shall consist of the excavation, removal, and satisfactorydisposal of all topsoil and soil containing organic material. Such

stripped materials shall not be used as structural fill material under anycircumstances.

2. Before any soil is removed, the area shall be cleared of all debris.

3. Unless otherwise directed by the engineer of record, 150mm depth

topsoil shall be removed to full-depth or as specified in the contract

documents.

4. Reusable materials shall be stockpiled as necessary for the contractorsoperations in areas approved by the purchaser.

4.3.1.3 Rough Grading

1. General area grading shall be completed to within a tolerance of+60

mm of the elevations shown in the contract documents, but shall not beuniformly high or low.

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2. Roads, parking areas, and building areas shall be excavated or filled tosubgrade elevations shown in the contract documents.

3. Rock encountered through cut sections shall be excavated to 0.3 mbelow subgrade elevation and shall be backfilled to the properelevation.

4. If unsatisfactory field conditions caused by rain, inclement weather, orother circumstances prevent satisfactory performance of the work,earthwork operations shall be suspended after consultation with theengineer of record and the purchaser.

5. After completing grading operations and before grassing operations, the

graded areas that are not to be further improved shall be overlaid withtopsoil of a compacted thickness of 100 mm minimum.

4.3.2 Excavation

4.3.2.1 Structural Excavation

1. Structural excavation shall include excavations for footings, grade

beams, pits, basements, retaining walls, manholes, catch basins, etc.

2. Structural excavation shall be performed in accordance with thecontract documents to the dimensions, grades, and elevations as noted

and as required for formwork.

3. All the side slopes unless otherwise mentioned in contract doc shall beminimum 2 (Horizontal): 1 (vertical).

3. If soft, compressible soil is encountered at footing grades as shown inthe contract documents, the soft soil shall be removed and replaced withstructural fill.

4. Over-excavation at footings shall bebackfilled with lean concrete. Leanconcrete shall have a mix design proportioned to achieve a minimum28-day compressive strength 5.0 MPa

4.3.2.2 Earthen Structures

1. Earthen structures include permanent work items such as ponds, canals,

ditches, etc.2. Excavation for earthen structures shall be made to the lines, grades, and

cross sections in accordance with the contract documents.

3. Side slopes of excavations shall be cut true and straight and shall begraded to the proper cross section.

4. Unstable soil in the slopes shall be removed, and the slopes properlyprepared.

5. The bottoms of excavations shall be graded to the elevations andconfigurations in accordance with the contract documents.

6. Over-excavation shall be backfilled with suitable material and

compacted in accordance with Section 4.3.7.7.

4.3.2.3 Excavation Safety

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Excavation safety shall meet all requirements of IS 3764 Excavation work-Code of safety and IS 4081 Safety Code for Blasting and Related

Drilling.

The contractor is solely responsible for designing and constructing stable,temporary excavations and should shore, slope, or bench the sides of theexcavations as required to maintain stability of both the excavation sides andbottom. The contractors competent representative should evaluate the soil

exposed in the excavations as part of the contractors safety procedures. Inno case should slope height, slope inclination, or excavation depth,including utility trench excavation depth, exceed those specified in local,state, and federal safety regulations.

4.3.3 Stockpiling

4.3.3.1 Material shall be stockpiled as required and specified by the owner.4.3.3.2 Stockpiles shall be placed, graded, and shaped for proper drainage.4.3.3.3 Storage or stockpiling of material shall not be permitted on a completed subgrade.4.3.3.4 Stockpiling of contaminated soils shall be in accordance with an owner approved

contaminated soils management plan or as specified by the owner.

4.3.4 Drainage

4.3.4.1 Drainage of cuts, excavations, fills, stockpiles, spoil areas, surcharge embankments,and borrow areas shall be maintained at all times to prevent ponding of surface waterfollowing rainfall by providing temporary ditches, swales, culverts, and/or pumpingsystems as required in each respective site area.

4.3.4.2 Temporary drainage facilities shall be removedat the completion of the project or asspecified by the owner.

4.3.4.3 A surface seal (e.g., sealing with a smooth drum roller) shall be performed asrequired to prevent saturation during wet weather or temporary shutdown ofoperations.

4.3.4.4 Soil that becomes saturated shall be removed completely or as specified by theengineer of record.

4.3.4.5 Saturated soil shall be disposed of as specified by owner or shall be reconditioned tobe in accordance with this specification.

4.3.5 Disposal of Excess and Waste Materials

4.3.5.1 If practicable, all suitable materials removed by excavation shall be used as fill.4.3.5.2 Excavated material in excess of that required for normal embankment construction

shall be stockpiled within the construction limits or shall be placed in a designated

spoil area beyond the construction limits as specified by the owner.

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a. Beneath or immediately surrounding foundations

b. Beneath slabs, roadways, railroads, area pavement, and parking areas

c. Where otherwise indicated on design drawings

4.3.7.2 All other areas not designated above may be filled or backfilled using general fills.4.3.7.3 Before placement of fill or backfill, the area to receive the fill shall be prepared in

accordance with Section 4.3.6.

Comment: On sloping sites, the engineer of record may also require, inthe contract documents, the excavation of natural soils to

key the new fill into the underlying soil.

4.3.7.4 Compacting shall begin only after the fill or backfill has been properly placed andafter the material to be compacted is at the proper moisture content.

4.3.7.5 Unless otherwise noted in the contract documents, material shall be placed in looselifts not exceeding the following criteria, provided that the specified compaction is

achieved for the full depth:

1. Structural fill shall be placed in lifts of 200 mm maximum in loose

depth.

2. General fill shall be placed in lifts of 300 mm maximum in loose depth.

3. Unless otherwise approved by the purchaser, for hand-operatedcompaction equipment, general and structural fill materials shall beplaced in lifts of 100 mm maximum in loose depth.

4.3.7.6 Compaction shall be performed with equipment compatible with soil type.4.3.7.7 Unless otherwise noted in the contract documents, fill and backfill layers shall be

uniformly compacted in accordance with the following density and moisture contentrequirements:

1. Structural Fill Compaction Densities

a. Structural fill shall be compacted to at least 90% of the maximumdry density (Modified Proctor Density) in accordance with IS 2720,Part 8, or 95% of the maximum dry density (Standard ProctorDensity) in accordance with IS 2720, Part 7.

b. Granular soil used as structural fill that does not exhibit well-defined moisture-density relationship shall be compacted to at least80% relative density in accordance with IS 2720, Part 14.

c. The structural fill material shall have a unit weight not less than

1900 kg/m3.

2. General Fill Compaction Densities

a. General fill shall be compacted to at least 85% of the maximum drydensity (Modified Proctor density) in accordance with IS 2720,

Part 8, or 90% of the maximum dry density (Standard Proctordensity) in accordance with IS 2720, Part 7.

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b. Granular soil used as general fill that does not exhibit well-definedmoisture-density relationship shall be compacted to 70% to 75%

relative density in accordance with IS 2720, Part 14.

3. The moisture content of the material being compacted shall be within+3% of the optimum moisture content in accordance with the applicableIS 2720, Part 7 or 8. Fill materials shall be conditioned as necessary toachieve the required moisture content, without additional cost to the

purchaser.

4. If approved by the engineer of record in writing, chemical stabilizationmay be used if modification of liquid limit and plasticity index are

necessary to obtain satisfactory compaction.4.3.7.8 Compaction by water jetting or flooding shall not be permitted.4.3.7.9 Fill and backfill adjacent to structures such as retaining walls, pits, and basements

shall not be compacted with heavy equipment, but with hand-operated equipment to adistance of 2.0 m or greater beyond the sides of the structures.

4.3.7.10To prevent unnecessary eccentric loading on a structure or foundation, every effortshall be made to place backfill materials symmetrically and in uniform layers.

4.3.7.11Unless otherwise permitted in writing by the purchaser, backfill around or over cast-in-place concrete shall not be permitted until the concrete has attained 75% of itsspecified strength.

4.3.7.12Compacted surfaces of fill and backfill shall be finish-graded to the cross sections,lines, grades, and elevations as specified in the contract documents.

4.3.8 Dewatering

4.3.8.1 All dewatering methods and disposal of water shall be approved by the engineer ofrecord.

4.3.8.2 If required for construction, before excavation, an approved dewatering system shallbe installed and operated when necessary to lower the groundwater.

4.3.8.3 Unless otherwise specified in the contract documents, the design of the dewateringsystem shall be the responsibility of the contractor.4.3.8.4 Contractor shall be responsible for any effects of dewatering on adjacent facilities.4.3.8.5 Surface water shall be prevented from flowing into excavations by installing ditches,

trenches, protective swales, pumps, or other purchaser approved measures.

4.3.8.6 All diverted and pumped water shall flow to existing drainage.4.3.8.7 Excavations for foundations and other underground installations shall not be used as

temporary drainage ditches.

4.3.8.8 At all times during construction, ample means with which to remove and properlydispose of all water from every natural source entering the excavation shall beprovided and maintained.

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4.3.8.9 Any water to be discharged that is potentially suspect of quality shall be tested forwater quality to determine whether the water can be disposed of through the natural

waterways or whether it shall be contained for treatment.

END

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