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					                                 CITY OF ARMADALE
                 SPECIFICATION FOR THE CONSTRUCTION
                         OF ASPHALT CROSSINGS
                     (Only accepted in rural areas or by prior approval by council)


Introduction
This document is designed to assist property owners and contractors to construct an appropriate
crossing to the satisfaction of the City of Armadale; allowing the property owner upon request to
receive the City’s crossover contribution.

In this regard property owners should ensure that their contractor is in possession of these
documents as crossings not constructed to these specifications will not be eligible for the City’s
contribution.


1.    TYPES

      1.1   Residential:        150mm thick compacted road base on a sound, consolidated
                                subgrade.
                                25mm minimum thickness asphalt, spread at a rate of 18m² per
                                tonne.

      1.2   Commercial/         200mm thick compacted road base on a sound, consolidated
            Industrial:         subgrade.
                                40mm minimum thickness asphalt, spread at a rate of 12m² per
                                tonne.

2.    AREA OF CROSSING

      2.1   Area of Crossing

            Area in square metres shall be calculated using the formula:

                   W1(m) + W2(m)
            L(m) x ---------------------     = Area (m²)
                            2

            where:         W1(m) is the width of crossing at property boundary measured in
                           metres;
                           W2(m) is the width of crossing at kerb line;
                           L(m) is the length of crossing from property boundary to kerb line.

            See Drawing No. 09-08-A attached for diagrammatic interpretation of
               measurements.


      2.2   Width of Crossing
            Residential:
            The width of a residential crossing will be:
                   a minimum of 3 metres to a maximum of 6 metres at the property
                       boundary.
                   a minimum of 5 metres to a maximum of 8 metres at the road edge.

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           Commercial/Industrial:
           The width of a commercial crossing will be:
                  a minimum of 6 metres to a maximum of 10 metres at the property
                     boundary.
                  a minimum of 8 metres to a maximum of 12 metres at the road edge


3.   SITE PLAN

     A site plan shall be submitted for Council approval prior to any construction works
     showing the location of crossings noting that the following minimum clearances of 800mm
     is required for:

              Side entry gullies,
              Streetlight poles,
              Verge trees and
              Pram Ramps

     The proposed location of the crossing should not encroach past the property side boundary
     at the road edge. See drawing No 09-08-L Typical Case 1.


     The crossing plan is to clearly indicate “the crossing is to be built to Council’s
     specifications”.

4.   CONSTRUCTION

     4.1   Contractor

           Asphalt crossings shall be constructed by a contractor experienced in such work.

     4.2   Kerbing

           All kerbing is to be cut and removed so that there is no damage to the road
           surface. A 500mm concrete layback (apron) is to be installed in place of the
           kerbing as shown on the Asphalt crossover plan.

           The crossing shall be constructed no sooner than 24 hours after the concrete
           layback (apron) has been installed

     4.3   Paths/Crossings

           Unless otherwise approved all existing paths shall be cut with a concrete saw and
           removed without damage to the remaining footpath and the crossing designed to tie
           in vertically with the cut edge of the path.

           Any material removed shall not be left on site over a weekend or public holiday.
           Following completion of all works the Contractor shall ensure all material is
           removed and the site left in a safe, clean and tidy condition. Material removed is to
           be disposed of at an approved disposal site.




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4.4   Excavation/Earthworks

      Care shall be taken not to damage existing services installed in the verge. Services
      shall be located by hand excavation and protected during the works. The Contractor
      shall be responsible for the repair of any damage to services to the owner’s
      satisfaction.

      The excavation for the crossing shall be in accordance with lines, grades and levels
      as detailed on Drawing No. 09-08-A.

      The excavation shall be carried out cleanly to provide for a consolidated base free of
      depressions, soft or loose areas and foreign materials. Any imported material shall
      be clean sand compacted with a plate compactor. It shall be the Contractor's
      responsibility to ensure all excavated material is removed from the site at the time of
      excavation. Excavated material shall not be stockpiled on-site or deposited or
      buried on the verge.

      No crossing excavation shall be left over a weekend or public holiday and the
      Contractor shall ensure that the excavation of the crossing and placement of road
      base occurs on the same day.

      The excavation shall be inspected and approved by the Executive Director Technical
      Services or his authorised representative prior to the placement of the base course.

4.5   Timber/ Concrete Kerbing

      After excavation, jarrah timber kerbing 100m x 25mm shall be placed on both edges
      of the crossing. This timber shall be set to the finished level of the crossing and held
      in place by 75mm x 50mm timber pegs 300mm long driven into the ground on the
      outside of the timber kerbing and nailed in place. The pegs shall be placed at 2
      metre intervals and are to finish 10mm below the edge timber level.

      Concrete kerbing can be used providing that it is not barrier (mountable or flush kerb
      is preferred) and that it complies with the City of Armadale kerbing standards. The
      verge side of the kerb must be back- filled to the top of the kerb with a slope of no
      more than 2%(1 in 6). See 8 and drawing

4.6   Base Course

      The base course shall comprise an approved quality natural or crushed rock material,
      such as gravel or road base. Limestone is not suitable for this purpose.

      The material shall be free from all root and other foreign material.

      The road base shall be evenly spread within the excavated area and rolled and water
      bound. Any “boney” spots shall be raked, re-rolled and water bound to achieve a
      close knit surface. Compaction not less than 95% of its maximum density as
      determined by the modified AASHO Compaction Test shall be achieved by using a
      pedestrian roller or small ride-on double-drum roller.

      The finished level of the road base shall be 20mm below the timber kerbing ready
      for asphalt for residential; 40mm for commercial.



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           The prepared base course shall be inspected and approved by the Executive Director
           Technical Services or his authorised representative prior to the placement of
           bituminous concrete.

     4.7   Asphalt

           Asphalt shall be a minimum of 25mm thick for residential, 40mm for commercial.
           Asphalt type shall be 7mm granite with a bitumen content of between 5% - 7% by
           mass and supplied from an asphalt production plant.

           Prior to laying of the asphalt a tack coat shall be sprayed on the road base. The tack
           coat shall comprise of an anionic bitumen emulsion which may be diluted by the
           addition of up to 50% of clean water. The application rate shall be 0.5 to 0.75 litres
           per square metre.

           The asphalt shall be evenly spread over the area and immediately rolled with a
           pedestrian roller. No break in this operation shall be permitted until all the
           bituminous concrete is finished. The asphalt shall be laid on a dry foundation.

           Under no circumstances shall the asphalt be spread when the ambient temperature is
           less than 5oC.

           Surplus asphalt shall be removed from the site and disposed of at an approved
           disposal site.

5.   LEVELS

     The crossing levels shall be as detailed in Drawing No. 09-08-A. Where the road channel
     levels and internal driveway levels have to be varied from the standard drawing, prior
     approval from the Executive Director Technical Services or his authorised representative is
     required for the construction levels.

6.   COUNCIL CONTRIBUTION

     Council’s contribution shall be up to 50% of the cost of the construction based on a
     standard concrete crossing based on the accepted tendered price for the construction of
     concrete crossings providing that the crossing:

              Is the first crossing constructed to the property.
              The crossing has been constructed in accordance with these specifications.

      In order to receive Council’s subsidy the following recepts shall be provided

              Contractors receipt for constructing the crossing.
              Proof of purchase of base material.

7.   PROTECTION OF WORKS

     The Contractor is responsible to protect the work at all stages and for the erection of
     barricades along the kerbs or road alignment as well as barricades across any footpath.
     Any surface damage due to inadequate protection or damage by rain shall be rectified by
     the Contractor at his expense.



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8.    VERGE REINSTATEMENTS

      The Contractor shall neatly reinstate the adjoining verge and taper same to mould with the
      new crossing. The maximum slope of tapers shall be 1:6 or 2%. Any sand used in this
      process shall be clean and free from any foreign material.

      The Contract shall clean up the site on completion of construction and leave the area in a
      tidy and safe condition.

9.    PROTECTION OF PUBLIC

      The Contractor's attention is specially drawn to the need to exercise precautions to protect
      the public during the progress of work. Adequate provisions shall be made for the safe
      passage of pedestrians and vehicles in the vicinity of the work.

      The conditions of the Occupational Safety and Health Act and Occupational Safety and
      Health Regulations 1996 shall be observed.

10.   MAINTENANCE

      The Contractor shall repair any defects in the completed crossing that may have become
      evident for a period of six months from the date work is accepted by the Council.




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