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DIVISION 2 - SITEWORK

SECTION 02210 - EARTHWORK

PART 1 - GENERAL

1.01 DESCRIPTION

This Section covers providing all operations in connection with excavation of soil androck, removal and disposal of all unsuitable soil and rock material from the WORK Site,placing and compacting of fill materials from WORK Site excavations and/or importedfrom a borrow pit and grading the site to the required elevations shown on theConstruction Drawings complete and acceptable to Company Representative.

PART 2 - PRODUCTS

2.01 FILL MATERIALS

A. General: Select Fill Material shall be used for all fills under all buildings, and

within 0.6 M of bottom of footings for all other structures including pre-engineeredsteel frame play structure, fences, retaining walls, enclosure walls, etc.. FillMaterial may be used on remainder of Site, subject to provisions below andspecific notes on the Construction Drawings.

B. On-Site Fill Material: Company Representative approved satisfactory materialremoved from excavation shall be used as far as practical for fill. Soil rockmixture which is free from organic matter containing no vegetation, masses ofroots, rocks or lumps over 100 mm in diameter and having not more than 15% ofthe rocks and lumps larger than 60 mm, shall be considered as suitable materialfor fill.

1. On-Site fill material may not be used for Select Fill unless it has beentested by a laboratory and shown to meet the requirements in Paragraph2.01, D, in this Section for Select Fill Materials.

2. Any On-Site fill material containing expansive clays, such as Hofuf Clay,shall not be used for any purpose on the site. It must be disposed to Off-Site.

C. Fill Materials: Imported or borrowed fill materials shall be excavated fromapproved borrow pits. The material shall be sand or calcareous clay of marineorigin, classified as marl, or combination of both sand and marl, or mixed withvarying percentages of silt as approved by Company Representative. Themaximum particle size shall be 100 mm or one-half the thickness of the layer,

whichever is smaller. Imported fill material may not be used for Select Fill unlessit has been tested by a laboratory and shown to meet the requirements inParagraph 2.01, D, in this Section for Select Fill Material.

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CONSTRUCTION SPECIFICATIONS

SABG GIRLS ELEMENTARY SCHOOL AND

BOYS INTERMEDIATE SCHOOL

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D. Select Fill Material: Select fill material shall be composed only of inorganicmaterial and shall have 5-20% passing the No. 200 sieve, and 100% passing the50mm sieve. Select fill shall be a Marl or Sand/Marl mix having the followingcharacteristics. That portion of the material passing the No. 40 sieve shall have amaximum liquid limit of 35 and maximum plasticity index of 12. Atterberg's limitsare not required for select fill material with less than 15% fines passing the No.

200 sieve. Sand/Marl mix may be site mixed by method approved by theCompany Representative.

E. Soccer Field Surface: Soccer field surface shall consist of thirty (30) cm. of amixture of 50% clean sweet sand and 50% Hofuf Red Marl placed in three (3) liftsof ten (10) cm. each. Spread to profile indicated on Site Grading Plan andcompact to satisfaction of Company Representative.

F. Site Finish Surface: (Areas not paved or planted) Surface shall consist of a 200mm thick select fill marl (33%) and sand (67%) cap evenly mixed and compactedfirmly to finish elevations shown on drawings. Finish surface materials shall have100% passing the 50mm sieve and 5-20% fines passing the No. 200 sieve.

PART 3 - EXECUTION

3.01 EXCAVATION

A. Unclassified Excavations: Excavation WORK shall consist of dewatering andremoving all material which includes solids and rock necessary for grading andconstruction in accordance with the lines and grades as shown on theConstruction Drawings.

B. Excavated Material: Excavated material shall be designated as suitable orunsuitable for use as fill by Company Representative. Suitable excavatedmaterial may be used to construct fill areas. Unsuitable material such as silts orclays containing organic material, soils containing large amount of rock, roots,grasses and other vegetation, soils containing expansive clays shall be disposedof Off-Site in conformance with Section-02110, Clearing And Grubbing, at theCONTRACTOR'S expense.

C. Encountered Unsuitable Material Below Grade: Unsuitable material encounteredat or below plan elevations shall be completely removed to its full depth or to adepth of one (1) meter whichever comes first and replaced with suitable fillmaterial. Bottoms of excavations shall be smooth and free of loose earth or sand.

Any soft or loose areas of insufficient bearing, as determined by CompanyRepresentative, shall be compacted to the density requirements.

D. Underground Service Utility: If any underground utility (electrical, drainage, wateretc.) is encountered unexpectedly, excavation shall cease and CompanyRepresentative shall be notified immediately. Emergency rectification WORK asnecessary shall be executed without delay in accordance with the Contract.

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E. Excavation for Structures: Excavation shall be made accurately to the lines,grades and elevations shown on the Construction Drawings. CONTRACTORshall provide sufficient dewatering equipment such that there will be no standingor flowing water in excavated areas during construction operations such asplacing concrete or compacting fill. Trenches and foundation pits shall be ofsufficient size to permit the placement and removal of forms for the full length and

width of structure footings and foundation shown on the Construction Drawings.Rock or other hard material shall be cleaned of loose debris and cut to a firmsurface, either level, stepped, or serrated, as shown or as directed. Loosedisintegrated rock and thin strata shall be removed. When concrete or masonryis to be placed in an excavated area, the top of the existing subgrade shall befirmly compacted.

F. Hand Excavation: Hand excavation will be required for WORK adjacent to theexisting utilities as specified by Company Representative or the utility agency'srequirements.

G. Proof Rolling: The bottom layer of existing material in any excavation shall beproof rolled with a roller compactor having a gross weight of 8 tons minimum, or

otherwise compacted to the satisfaction of Company Representative prior tobackfilling. Testing of this layer of compaction will not be required, if one or morelayers of fill will be added which will be tested.

3.02 FILL

A. Select Fill shall be used for all fill under buildings and for a distance of 3 metersoutside the outer line of the buildings. For other structures it shall be used within600 mm of the bottom elevation of foundations or spread footings and shall beSelect Fill Materials materials as described in Paragraph 2.01, D, of this Section.

B. Preparation of Ground Surface for Fill: Ground surface on which fill is to beplaced shall be plowed, disked, or otherwise broken up; pulverized; moistened or

aerated as necessary; thoroughly mixed; and proof rolled.

C. Placing Fill: Fill materials shall be placed in successive horizontal lifts or layersnot to exceed 200 mm in depth. Each layer, before starting the next, shall beleveled and smoothed by means of power driven graders, bulldozers or othersuitable equipment. Hauling and spreading equipment shall be operated over thefull width of each layer

D. Compaction: All fills shall be compacted to 70 percent relative density as definedby ASTM D4253 and D4254 (for cohesionless materials) or 95 percent of themaximum density determined by ASTM D698 (for cohesive materials).

1. When the backfill materials cannot clearly be classified as cohesive orcohesionless both relative and proctor density tests must be performed perabove paragraph. The backfill shall then be compacted to the greaterdensity.

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2. Prior to compaction of backfill a field test section using the intendedcompaction equipment shall be performed to determine the proper liftthickness to achieve the necessary density requirement.

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E. Backfilling adjacent to Structures: Backfill shall be placed and compacteduniformly in such a manner as to prevent wedging action or eccentric loadingupon or adjacent the structures. Large compaction equipment (over 1 toncapacity) shall not be used within 3 Meters of any existing structures withoutspecific written approval of Company Representative.

F. Borrow Pit: Prior to importing borrow materials and/or transporting fill material toWORK Site areas requiring fill, the CONTRACTOR shall submit his laboratorytests supporting the materials qualifications. Company Representative reservesthe right to inspect and make tests of the fill material for conformity with theSpecifications. Fill material which does not meet the requirements ofSpecifications shall not be used and, if on the WORK Site, shall be removed fromthe WORK Site at CONTRACTOR'S expense.

G. Select Fill shall be used within 600mm of the bottom elevation of foundations,spread footings or slab on grade, and shall be "Select Fill Materials as describedin Paragraph 2.01,D. of this Section.

3.03 GRADING

A. General: The surfaces of all excavation, backfilling, compaction, embankments,and subgrades shall be finished reasonably smoothly and compacted inaccordance with the lines, grades and elevations shown on the ConstructionDrawings. The workmanship expected shall be that ordinarily obtained fromcareful blade grader operations. Areas not accessible by power equipment shallbe graded by hand methods to eliminate all surface humps, ridges, anddepressions.

B. Ditches and Swales: Ditches and swales shall be graded to the acceptance of soas to permit adequate drainage away from buildings, roadway surfaces or flatspots and prevent ponding.

C. Roadway and Shoulders: Roadway and shoulders shall be given a neat finishgrade and slope away from the roadway centerline as shown on the ConstructionDrawings or as directed by Company Representative.

D. Sideslopes and Backslopes: All open or exposed roadway or embankmentslopes, shall be dressed to fit into abutting areas by smooth curves and toeliminate all abrupt slope changes, but shall not be steeper than two horizontal toone vertical.

3.04 COMPACTION TEST

A. Methods: To verify that the specified degree of compaction has been achieved,CONTRACTOR shall perform in-place density tests ASTM D-1556 or D-2922after compaction of each lift of fill and performed at the top layer and at least onelift thickness below the compacted surface.

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B. Number of Tests: At general fill areas, at least one test for each 100 cubicmeters. In trenches, one test per lift per 30 meters of length. During the progressof the WORK, Company Representative may require additional tests in order toverify the degree of compaction. There shall be no additional cost to SAUDI

ARAMCO for such tests.

C. Tolerance:

Fill shall be placed and compacted to the grades shown on the ConstructionDrawings to, within a tolerance of zero below and 50 mm above grade.Embankment slopes shall be constructed to within 150 mm of the plan location.

END OF SECTION

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