invitation to apply for eligibility and to bid - Clark Freeport Zone

103(1) Structure excavationThis item shall consist of the necessary excavation for foundation of culverts,underdrain, and other structures not otherwise provided for in the Specifications. Except asotherwise provided for pipe culverts, the backfilling of completed structures and thedisposal of all excavated surplus materials, shall be in accordance with these Specificationsand in reasonably close conformity with the Plans or as established by the Engineer.This item shall also include necessary diverting of live streams, bailing, pumping,draining, sheeting, bracing, and the placing of all necessary backfill.Prior to starting excavation operations in any area, all necessary clearing and grubbingin that area shall have been performed in accordance with item 100, Clearing andGrubbing.Trenches or foundation pits for structures or structure footings shall be excavated tothe lines and grades or elevations shown on the approved plan or as staked by theEngineer. They shall be of sufficient size to permit the placing of structures or structurefootings of the full width and length shown. Any excavation carried beyond the limitsshown or described on the drawings or specifications or beyond the dimension resultingfrom adjustments made by the Engineer shall be backfilled with materials acceptable andas directed by the Engineer.The volume of excavation to be paid for will be the number of cubic meters measured inoriginal position of material acceptably excavated in conformity with the plans or asdirected by the Engineer.104(1) - Embankment from Roadway ExcavationThis item shall consist of the construction of embankment in accordance with thisspecification and in conformity with the lines, grades and dimensions shown on the plansor established by the Engineer. Embankment shall be constructed of suitable materialwhich is acceptable in the manner specified in this item. It can be common material or rockor non-treated lahar material. Embankment and backfill materials shall be pre approved bythe Engineer prior to actual laying.Prior to construction of embankment, all necessary clearing and grubbing in that areashall have been performed in accordance with item 100, Clearing and Grubbing.Embankment construction shall consist of constructing roadway embankment, includingpreparation of the areas upon which they are to be place.Roadway embankment material shall be placed in horizontal layers not exceeding 200mm (8 inches), loose measurement, and shall be compacted as specified before the nextlayer is placed. The quantity of embankment to be paid for shall be the volume (cubicmeter) of material compacted in place and accepted by the Engineer.

105(1) – Sub Grade PreparationThis item shall consist of the preparation of the sub grade for the support of overlyingstructural layers. It shall extend to full width of the roadway. Unless authorized by theEngineer, sub grade preparation shall not be done unless the Contractor is able to startimmediately the construction of the pavement structure.Prior to commencing preparation of the subgrade, all culverts, cross drains, ducts andlike (including their fully compacted backfill), ditches, drains and drainage outlets shall becompleted. Any work on the preparation of the subgrade shall not be started unless priorwork herein described shall have been approved by the Engineer.The quantity to be paid for shall be the area, in square meter, of the work specified tobe carried out and accepted by the Engineer.PART – D -SUBBASE AND BASE COURSEItem 200 Aggregate Sub Base CourseThis item shall consist of furnishing , placing and compacting an aggregate subbasecourse on a prepared subgrade in accordance with this Specification and the lines, gradesand cross-sections shown on the Plans, or as directed by the Engineer.It shall consist of hard, durable particles or fragments of crushed stone, crushed slag,or crushed or natural gravel and filler or natural or crushed sand or other finely dividedmineral matter. The composite material shall be free from vegetable matter and lumps orballs of clay, and shall be of such nature that it can be compacted readily to form a firm,stable subbase. The subbase material shall conform to the grading requirements of Table200.1 – Grading Requirements of DPWH Standard Specification 2004.The aggregate subbase material shall be placed at a uniform mixture on preparedsubgrade in a quantity which will provide the required compacted thickness. The maximumcompacted thickness shall not exceed 150mm. all subsequent layers shall be spread andcompacted in a similar manner. The moisture content of the material shall, if necessary beadjusted prior to compaction by watering with approved sprinklers mounted on trucks or bydrying out as required in order to obtain the required compaction.The Aggregate Subbase Course will be measured by the cubic meter. The quantity tobe paid for shall be the design volume compacted in-place as shown on the Plans, andaccepted in the completed course.Item 202 Crushed Aggregate Base CourseThis item shall consist of furnishing, placing and compacting crushed gravel, crushedstone or crushed rock on a prepared subgrade/subbase in one or more layers inaccordance with this Specification and lines, grades, thickness and typical cross-sectionsshown on the Plans or as established by the Engineer.

When stoppages of concreting operations eventually occur for any reason, constructionjoints shall be placed horizontally or as directed by the Engineer and be provided withshear keys and dowels to develop bond. Construction joints shall be approved by theEngineerPoured Joint fillers shall be mixed asphalt and mineral or rubber filler conforming to theapplicable requirements of Item 705, Joint Materials. Poured filler for joints shall conformto the requirements of AASHTO M 173. Preformed fillers for joints shall conform to therequirements of AASHTO M 33 (ASTM D 994), AASHTO M 153, AAHHTO M 220, asspecified, and shall be punched to admit the dowels where called for the plans.The area to be paid for under this item shall be the number of square meters ofconcrete pavement placed and accepted in the completed pavement. All reinforcing steelbars incorporated in the concrete pavement shall not be measured separately for payment,cost of which has been considered paid under this particular item.Part – G -DRAINAGE AND SLOPE PROTECTION STRUCTUREItem 502(2)a, 502(2)b Curb inlet with handhole, Curb inlet with lined canalThis item shall consist of the construction of curb inlets with handhole, and lined canalin accordance with this Specification and in reasonably close conformity with the lines andgrades shown on the Plans or as established by the Engineer.Concrete for these structures shall meet the requirements of Item 405, StructuralConcrete of DPWH Standard Specification 2004 edition. Reinforcement shall be deformedbars cold-bent to the shapes and accurately placed in position and firmly held there duringplacing and setting of the concrete. They shall be free from rust, injurious defects such ascracks and laminations. Reinforcement shall be placed and then inspected and approvedbefore placing of concrete begins. Steel reinforcement shall conform to the requirements ofitem 404 (Reinforcing Steel).The quantity of curb inlet with handhole to be paid for shall be the number of unit (ea)completed and accepted, while the quantity of curb inlet with lined canal to be paid forshall be the total length in meters completed and accepted.Part – H – MISCELLANEOUS STRUCTURESItem 413 Pre-formed Expansion Joint FillerPre-formed joint fillers shall conform to the requirements of AASTHO M 33 (ASTM D994), AASTHO M 153, AASTHO M 213, AASTHO M 220, as specified, and shall be punchedto admit the dowels where called for on the Plans, The Joint filler shall be furnished in asingle piece for the depth and width required for the joint unless otherwise specified by theEngineer. When use of more than one piece is authorized for a joint, the abutting ends

shall be fastened securely and held accurately to shape, by using stapling or otherpositive fastening satisfactory to the Engineer.The quantity of the pre-formed joint filler to be paid for shall be the number of squaremeters completed in-place and accepted by the Engineer.Item 600(1) Concrete Curb and GutterThis Item shall consist of the construction of cast in place concrete curb, andcombination of curb and gutter in accordance with this Specification at the location, and inconformity with lines, grades, dimensions and design, shown on the Plans or as requiredby the Engineer.Concrete shall be class “A” and shall conform to the requirements of Item 405,Structural Concrete.The length of curb and combination of curb and gutter to be paid for shall be thenumber of linear meters cast in place in accordance with the required dimensions shownon the Plans.Item 601 Concrete SidewalkSidewalk shall conform to the dimension and thickness of the approved Plan. Cementconcrete shall be Class “A” as specified in Item 405, Structural Concrete. The bed coursematerial shall be placed in accordance with Item 200, Aggregate Subbase Course.The area to be paid for shall be the number of square meters of the sidewalkmeasured, completed in-place and accepted.Part – J – WAITING SHEDSTECHNICAL SPECIFICATIONS AND SCOPE OF WORKSA lump sum item shall be provided for the construction of waiting shed which shall befull compensation for all labor, materials, fixtures, tools, equipment, and all incidentalsnecessary for the completion of the waiting shed.For the purpose of progress billings, a breakdown of this lump sum item shall beincluded as annex to the Bill of Quantities. The aggregate of the breakdown price should beequal to the lump sum bid price for this item.D2SITE WORKS2AClearing and StakingThe Contractor shall stake out locations of footings including vertical andhorizontal references of the comfort room in the presence of the Engineer in

and dimension shown on the plans or as directed by the Engineer.Excavation shall be in conformity with lines, grades and dimension shown on the plansor as directed by the Engineer and shall be in accordance to the requirement of Item103, Structure Excavation.Backfilling shall be in accordance to provisions prescribed in Item 103, StructureExcavation.Excavated material shall be disposed of immediately to designated place, except whenexcavated materials are suitable and shall be used for backfill.D3CONCRETES3A Cast-In-Place ConcreteConcrete shall conform to Item 405, Structural Concrete. Concrete for footing, beams,and slab on fill shall be of Class A (3000psi). All cement shall be Portland type –1, ASTMC-150.Fine aggregates used in the composition of concrete shall consist of washed river sand.Coarse Aggregate shall consist of stone, gravel or other approved inert materials withsimilar characteristics. Size shall be ¾” crushed gravel.The water to be used for the concrete works shall be potable. Reinforcing steel barsshall be deformed reinforcing steel bar Grade # 230.D4MASONRYS4AConcrete Masonry Unit WorkConcrete Hollow Blocks shall be machine made and have a minimum face thickness of1” (0.025). Nominal size shall be 100mm (4”) thick x 200mm (8”) x 400mm (16”).Sand shall be washed river sand, well screened, clean, and free from loam, silt andother impurities. Mixture of cement mortar shall be made of one part Portland Cementand two parts fine aggregate by volume.D6WOOD AND PLASTICS6ACarpentry and JoineryThe work under this item shall consist of furnishing all required materials, fabricatedwoodwork, tools, equipment and labor and performing all operations necessary for thesatisfactory completion of all carpentry and joinery work in strict accord with applicabledrawingsLumber of different species herein specified for the various parts of the structure shallbe well seasoned, sawn straight, sun dried or kiln dried and free from defects such as

loose unsound knots, pitch pockets, sapwood, cracks and other imperfections impairingstrength, durability and appearance.Trusses and other roof framings shall be assembled, fitted and set to exact location andslope indicated in the approved Plans.Nails, screw, bolts and straps shall be provided and used where suitable for fixingcarpentry and joinery works. All fasteners shall be brand new and adequate size toensure rigidity of connections.Trusses and Rafters1. Use 2”x8” Sun Dry Tanguile2. Use 2”x5” Sun Dry Tanguile3. Use 2”x2” Sun Dry Tanguile (Purlins)Ceiling1. Use 2”x2” KD for joist and 4.50 mm thk Fiber Cement Board for ceiling board with1”x1” wooden Quarter “C”.D7THERMAL AND MOISTURE CONTROLS7K.Metal RoofingThe work under this item shall consist of furnishing all required materials, tools,equipment and labor and performing all operations necessary for the satisfactorycompletion of metal roofing work in strict accord with applicable drawings, details andthese specifications.Main Roof1. Install 0.40mm thk. Pre-painted Rib-Type Long Span roofing2. Provide Gutter (Verify Actual Design)3. Provide Ridge rollD9S9AS9BFINISHESPlasteringPlaster all CHB Wall / Masonry Surfaces of Class “A” Cement Plaster Mixture consistingof Portland Cement and River Washed Sand.Field PaintingThe work under this item shall consist of furnishing all required materials, tools,equipment and labor necessary for the satisfactory completion of painting work in strictaccord with applicable drawings, details and these specifications.

S9B.1Wall Surfaces( Masonry/Concrete)Surface Preparation:(new painting)1. Surface to be painted must be allowed to dry for 14 to 28 days beforeneutralization.2. Surface should be clean and dry, free from oil, grease, dust, dirt,contaminants and all loose girt or mortar.Painting System Recommendation:1. Cover all cracks by using Patching Compound before painting the surfaces.2. Apply one (1) coat of Flat Latex by brush, roller or spray. Let dryovernight.3. Apply two (2) coats of Semi-Gloss Latex by brush, rolleror spray. Let dry overnight.S9B.3 Safety PrecautionsThe use and application of paints is not considered a dangerousoccupation, but health and safety hazards do exist whenever flammablematerials are handled.The following rules summarize the precautions to be observed when handlingand applying paints.1. Good housekeeping must be part of any efficient operation. All paintingmaterials and equipment should be stored in a room assigned for thepurpose that is consistent with manufacturer’s recommendations. Thestorage room must not be near any heat sources such as furnaces, steampipes or radiators. Rags and waste soiled with paint should be removedfrom the premises at the end of each day’s work or be stored in metalcoveredcontainers half-filled with water. Spills must be cleaned upimmediately to prevent falls.2. Sufficient ventilation is the key to safe application. Although many solventsare not extremely toxic, the use of adequate protective masks, clothing andequipment is recommended.3. Open flames and sparks from cigarettes and matches must be prohibitedfrom the painting area, as these are fire and explosion hazards.S9CCeramic Tiles and Stone WorkThe work under this item shall consist of furnishing all required materials, tools,equipment and labor necessary for the satisfactory completion of tile work in strictaccord with applicable drawings, details and these specifications.All coursed of actions pertaining to the construction procedures and discrepancies shallbe fully coordinated to the Project Engineer prior to the completion of the project.