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SCOPE OF WORK (PROJECT SPECIFICATIONS)

MATTERS RELATING TO THE STANDARD SPECIFICATIONS

B1 PROJECT SPECIFICATIONS REFERRING TO THE STANDARD SPECIFICATIONS AND ADDITIONAL SPECIFICATIONS

In certain clauses the Standard Specifications allow a choice to be specified in the Project Specifications between alternative materials or construction methods, and for additional requirements to be specified to suit a particular contract. Details of such alternatives or additional requirements applicable to this Contract are contained in this part of the Project Specifications. It also contains some additional specifications required for this particular Contract.

The number of each clause and each payment item in this part of the Project Specifications consists of the prefix B followed by a number corresponding to the number of the relevant clause or payment item in the Standard Specifications. The number of a new clause or a new payment item that does not form part of a clause or a payment item in the Standard Specifications and is included here, is also prefixed by B followed by a new number. The new numbers follow on the last clause or item number used in the relevant section of the Standard Specifications.

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B2 SECTION 1100 : DEFINITIONS AND TERMS

B 1115 GENERAL CONDITIONS OF CONTRACT

REPLACE "for National and Provincial Road and Bridge Works", IN THE SECOND AND THIRD LINES WITH "The General Conditions of Contract for Construction Works (GCC 2010)".

ADD THE FOLLOWING CLAUSE:

"B 1156 LABOUR-OPTIMISING CONSTRUCTION

The cost effective employment of as great a portion of labour as is practically and technically feasible to produce a standard of construction as required by the Specifications, thus the economic substitution of plant and mechanical equipment in favour of available labour using hand tools, on condition that this method is not more expensive than the conventional construction practices."

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B3 SECTION 1200 : GENERAL REQUIREMENTS AND PROVISIONS

B 1202 SERVICES

ADD THE FOLLOWING:

"Before work commences, the Contractor shall contact all private owners or public authorities controlling services to allow them to protect, move or relocate a service as required, or to confirm that all such work has been completed.

No payment will be made for inconvenience to the Contractor due to services crossing the Site or any authority working on such services, nor will delays caused by such workings be accepted as a basis for claiming an extension of time for completing the Works."

B 1209 PAYMENT

(b)Rates to be inclusive

ADD THE FOLLOWING TO THE FIRST PARAGRAPH:

"VAT shall be excluded from the tendered rates and sums and provided for as a lump sum in the summary of the Bill of Quantities."

ADD THE FOLLOWING SUBCLAUSE:

"(g) Payment certificates

With reference to Clause 49.1 of the General Conditions of Contract, the Engineer's Certificate will only be issued after he has received a draft certificate prepared by the Contractor at his own expense in the form prescribed by the Engineer. The cost of duplicating and delivering copies of the certificate to the Contractor, the Engineer and the Employer shall be borne by the Contractor. The Engineer and the Employer require a total of four sets of A4-sized paper copies."

B 1215 EXTENSION OF TIME RESULTING FROM ABNORMAL RAINFALL

REPLACE THIS CLAUSE WITH:

Clause 5.12.2.2 of the GCC (2010) as amended in the Contract Data.

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ADD THE FOLLOWING:

B 1230 MEASUREMENT AND PAYMENT

Item Unit

B 12.01 Excavation for existing services:

a) Excavation in search of existing services in soft material situated in the following depth ranges

(i)0m to 2m.............................................................................................m³

b) Extra over B12.01(a) for excavation in hard material in close vicinityof services using picks, jackhammers, powertools etc. where no blasting or machine excavation is permitted..........................................m³

The tendered rate shall include full compensation for all construction equipment, labour, loss of production, transportation of equipment and materials as well as other items or losses suffered by the contractor.

B 12.02 Shifting of services:a) Allow a provisional sum for the repair and/or relocation of existing

services which is not allowed for in the schedule of quantities..Prov. Sum

b) Handling cost and profit........................................................Percentage %

The tendered percentage is a percentage of the amount actually spent under sub-item B12.02 (a), which shall include full compensation for the handling cost of the Contractor, and the profit in connection with the relocation and protection of existing services ordered by the Engineer.

B 12.03 Compensation in terms of Clause 5.12.2.4 of the General Conditions of Contract - 2010 and Clause 9.1.4 of the Contract Data, for delays incurred

(a) Plant :...................................................................Unit : Sum per working day

(b) Labour :................................................................Unit : Sum per working day

(c) Supervision : .......................................................Unit : Sum per working day

(d) Other services, facilities etc.not covered by (a), (b) and (c) :.......................Unit : Sum per working day

The sum tendered for each item shall cover the full and final standing cost per day of delaying the specified resource or facility and no additional compensation shall apply, notwithstanding any provisions to the contrary in the contract documents, or in respect of any extension of time granted in relation to the circumstances described in Clauses 5.12.2.4, 9.1.1 and 9.1.2 of the General Conditions of Contract - 2010.

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For the purposes of calculating the total delay, a working week shall be held to consist of five working days and a working day 9 hours.

Payment for partial standing of any of the scheduled resources for a day or part there of, or the standing of a complete resource for a part day, will be made pro-rata in proportion to an appropriate factor assessed by the Engineer.

The amount by which compensation for delays is adjusted shall be subject to the contract price adjustment formula as defined in the General Conditions of Contract - 2010.

This payment item shall only apply to delays which in the opinion of the Engineer are due to the circumstances described in Clauses 9.1.4, 9.1.1 and 9.1.2 of the General Conditions of Contract - 2010.

The cost of delays incurred for all other circumstances shall be treated as provided for in the General Conditions of Contract -2010.

The provision of this clause shall in no way prejudice the rights of either the Employer or the Contractor to terminate the contract in terms of the provisions in clause 9 of the General Conditions of Contract - 2010.

The Contractor shall take note that no payment will be considered for any additional cost incurred in protecting his plant and site establishment, as well as for costs incurred in respect of damage to constructional plant and equipment.

B 12.04 Dayworks:a) Labour...........................................................................................hour (hr)

b) Foreman.......................................................................................hour (hr)

c) Artisans.........................................................................................hour (hr)

d) Air compressor 4m³/min, complete with drills, jack hammers etc.hour (hr)

e) Pump including all necessary hoses.............................................hour (hr)

f) Truck as follows:

g) Truck (3-5t) with operator.............................................................hour (hr)

h) Truck (6-10t) with operato.............................................................hour (hr)

i) Concrete mixer, 0.5m³..................................................................hour (hr)

j) Vibrating roller (BM 60) compactor, 0.6m wide.............................hour (hr)

k) Front end loader with operator, 0.8m³..........................................hour (hr)

l) Back actor with operator, 0.3m³....................................................hour (hr)

m) Watercart, 500L............................................................................hour (hr)

n) Survey assistant...........................................................................hour (hr)

o) (i) Allow a provisional sum for purchase of materials...... Prov. Sum

(ii) Handling cost and profit in respect of subitem B12.04(m). Percentage %

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Expenditure under this item shall be made with the general conditions of contract.

The tendered percentage is a percentage of the amount actually spent under subitem B12.04 (m)(I), which shall include full compensation for the handling costs and the profit of the contractor.

Item Unit

B 12.06 Compliance with OHS Act And Regulations (Including The Construction Regulations 2003)........................................sum

The tendered sum shall include full compensation to the Contractor for compliance with all the requirements of the OHS Act and Regulations (including the Construction Regulations 2003) at all times for the full duration of the Contract. The successful tenderer shall provide the Engineer with a complete breakdown of this tendered sum.

This sum will be paid to the Contractor in equal monthly amounts subject to proper/substantial compliance."

Item Unit

B12.07 The relocation of existing water services:

(a) Erf connections..................................................................................metre

(b) Water mains......................................................................................metre

(c) Valves....................................................................................................No

The rate covers the cost for dissembling, lifting and disposing of, if required, and the additional cost for taking special precautions while excavating in the vicinity of the services as well as reinstating service in new position, including excavation to relocate service in new position.

Material, which is regarded as unsuitable, must be indicated to the Engineer before removal. The Contractor can only claim compensation for material if the Engineer gave prior written approval.

Item Unit

B12.08 Street lighting

a) Supply and installation including excavation, reticulation, earthing, testing and commissioning of street lighting by the Electricity and Energy Business Unit of the NMBMM …………………………………...…Unit : Sum

b) Handling cost and profit on (a) above…………………………………Unit : %

B12.09 Existing Services That Intersect Or Adjoin A Pipe Trench

a) Services that intersect a trench ………………………….………...Unit : No (angles between centre-lines in plan of 45-90º)

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Except where water pipes are to be recovered, existing water pipes, sewer, stormwater pipes, concrete-lined channels and drains, box culverts, electrical cables, ducts, kerbs, channels, erf connections and various sizes of pipes and services that intersect a trench of specified width and require various degrees of care, whether or not their presence is known before they are so grouped that they can be contained within a horizontal dimension of 200mm measured at right angles to the axis of the services will be measured as one unit.

Existing services with a depth of cover exceeding 300 mm, measured from the bottom of excavation to the top of the existing service shall not be measured and paid for. There will be distinguished between existing trunk services and existing erf connection.

The rate shall also allow for the following costs:

i) Sufficient photo's have to be taken of existing services and handed over to the Engineer before they are being crossed, if there is a possibility of a difference in opinion over the condition of those services, especially on private property.

ii) If such a service is damaged, it has to be repaired to its original condition or if possible, to a standard agreed to in writing with the relevant owner. This agreement has to be approved by the Engineer.

iii) If such a service is removed, it has to be replaced as per original.

b) Services that adjoin a trench……………………………………Unit : No or m (parallel to or at an angle between centre-lines in plan of less than 45º)

In case where a trench of specified width

1) runs parallel to or at an angle (in plan) of less than 45º to an existing service, and

2) is such that the nearer side of the bottom of the trench lies at least partly between a vertical plane and a plane that lies at an angle of 45º below the horizontal, both planes passing through the axis of the service,

the length of service within the minimum base width of the trench. The base width comprises of the external diameter, a side allowance on each side of the service not exceeding 300 mm and will be measured for payment under this item and the remaining length, the side of the trench which, in the opinion of the Engineer, is rendered liable to collapse because of the existence of such service, shoring must be used.

The rate for an item scheduled in terms of (a) and (b) above shall cover the additional cost of

i) care in excavation necessitated by the presence of such service in or across the trench;

ii) protecting and maintaining such service in operation by means of temporary support or shoring, as necessary;

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iii) delays and disruptions of the progress of the work due to the existence of the service, and

iv) repairs necessitated by damage caused by the Contractor.

The unit "number" will only be used for services such as poles and trees.

No payment will be made for overhead services that do not rest directly on the ground except where allowance is made for this in the schedule of quantities.

Existing services that rest directly on the ground e.g. poles, trees, walls and structures are handled in the same way as underground services, but the axis of the service will be determined as follows:

The vertical axis is defined as the nearest side or corner of the existing structure to the excavation, measured at the point where the structure and natural ground level intersect.

The horizontal axis will be at the point where the structure and the natural ground level intersects. In this instance, where the excavation falls above the 45° line but within 1,0 meter horizontally from the structure, the service will also be measured as adjoining.

If the structure, according to the above-mentioned, does not qualify as an adjoining service but the foundation of the structure is such that if a 45° line drawn from the nearest bottom corner thereof cuts through the excavation, the structure will be measured as an adjoining service if approved by the Engineer.

There will be distinguished between existing trunk services and existing erf connection.

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B4 SECTION 1300 : CONTRACTOR'S ESTABLISHMENT ON SITE AND GENERAL OBLIGATIONS

B 1303 PAYMENT

Item

B13.01 The Contractor's general obligations

ADD THE FOLLOWING AFTER THE FOURTH PARAGRAPH:

"The combined total tendered for subitems (a), (b) and (c) shall not exceed 15% of the Tender Sum (excluding Section 1200, the contingent sum and VAT)."

ADD THE FOLLOWING ON PAGE 1300-2.

“The Contractor will not be paid time-related obligations for any Special Non-Working Days, which shall be deemed to have been allowed for in his rates.

The time-related obligations shall also cover the cost of providing security personnel the Contractor deems appropriate, taking cognisance of the location of the site and the historical record of incidents of crime in the area”.

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B5 SECTION 1400 : HOUSING, OFFICES AND LABORATORIES FOR THE ENGINEER’S SITE PERSONNEL

B 1402(b) OFFICES

ADD THE FOLLOWING:

“No air conditioning unit and landline is required by the Engineer”.


ADD THE FOLLOWING:

Item Unit

B 14.11 Telephones

(a)Cost of calls in connection with contract administration....................PC Sum

(b)Handling costs and profit in respect of subitem B14.11(a).......Percentage %

B 14.12 Supply of computer, modem and printer:

(a) Provision of a personal computer and modem for duration of contract..................................................................................Number (No)

(b) Provision of printer for duration of contract............................Number (No)

The unit of measurement shall be the number of personal computers and/or printers provided on the Engineer’s instructions for the duration of the contract. The equipment shall at least comply with the following:

Computer: Pentium III 600MHz, 128MB DIMM RAM, 10GB HDD, 15”. 28 SVGA Colour monitor, 1.44MB stiffy drive, 42x CD ROM drive, 56K Modem, keyboard and mouse. It shall also include Windows XP and MS Office 2003 (Word and Excel). The printer shall be Hewlett Packard or Lexmark colour inkjet (or similar) approved by the Engineer.

The tendered rate shall include compensation for the provision and maintenance of any equipment as well as provision of ink cartridges for the printer for the duration of the contract. The equipment shall remain the property of the contractor.

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B6 SECTION 1500 : ACCOMMODATION OF TRAFFIC

B 1501 SCOPE

ADD THE FOLLOWING:

“This section also covers the provision of additional information signs for materials and releasing notices to the media and the public.”

B 1502 GENERAL REQUIREMENTS

i) Traffic Safety Officer

ADD THE FOLLOWING:

“The traffic safety officer shall be approved by the engineer. If found incompetent, the engineer shall instruct the Contractor to remove and replace him with a competent person. The Contractor shall provide the officer with the necessary resources, inter alia a light delivery van (LDV), warning boards and two revolving amber flashing lights. The works CONTRACTOR’S TRAFFIC CONTROL shall be displayed on these warning boards in 250mm high red letters on a white background and the boards shall be mounted on the vehicle at least 1,5m above ground level to be clearly visible. The vehicle shall be equipped with two revolving amber coloured flashing lights with a minimum intensity of 100W. The warning light shall be switched on at all times and the boards shall be displayed when the vehicle is used on the site. The traffic safety officer, his vehicle, equipment and personnel shall be available 24 hours per day and on special non-working days as specified in the Appendix to Tender and shall not be utilised for any other duties.

The traffic safety officer shall, in addition to the duties listed in paragraph 1502(I), also be responsible for removal of broken down vehicles off the roadway and implementing actions requested by the traffic authorities with regard to the work to be carried out, be responsible for the erection and maintenance of all traffic signs necessary for the accommodation of traffic, ensure that the temporary traffic lights are functioning properly, ensure that all obstructions related to the Contractor’s activities are removed before nightfall every day and ensure that the road is safe for night traffic.

He shall also be responsible for contacting the relevant traffic authority and South African Police Service in the event of an accident on the section of road under construction, give assistance to injured persons and animals, irrespective whether they are in the employ of the Contractor or not, remove vehicles that block the road, irrespective of whether it is a result of an accident or normal breakdown.”

B 1503 TEMPORARY TRAFFIC CONTROL FACILITIES

b) Road Signs and Barricades

ADD THE FOLLOWING:

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“All road signs shall be new or approved by the engineer as new in accordance with the specifications. All temporary road signs shall be mounted on portable supports to facilitate moving. The road signs and barricades shall be erected in accordance with the drawings included in Volume 4: Drawings.

The Contractor shall have available on site sufficient extra road signs, barricades, delineators, channelisation devices and traffic cones to replace items that have become defective or missing. These shall be no additional payment for these signs.”

c) Channelisation Devices and Barricades

ADD THE FOLLOWING:

“Traffic cones manufactured in a fluorescent red-orange or red plastic material shall only be used at short term lane deviations during daylight. Cones used on all lane deviations shall be 350mm high. Lane deviations and/or closures which will be in place during the night shall be demarcated by means of delineations only.”

d) Warning Devices

REPLACE THE FIRST SENTENCE OF THE FIRST PARAGRAPH WITH THE FOLLOWING:

“All self propelled construction vehicles and plant used on the works shall be equipped with rotating amber flashing lights with lens heights of at least 200mm and an output of at least 100W.”

REPLACE THE FIRST SENTENCE OF THE SECOND PARAGRAPH WITH THE FOLLOWING:

“All self propelled construction vehicles and plant used on the works shall be equipped with warning boards mounted at least 1,5m above ground level to be clearly visible.”

ADD THE FOLLOWING PARAGRAPH AFTER THE SECOND PARAGRAPH:

“The Contractor shall also provide similar rotating amber flashing lights with magnetic bases and cables with connections to fit standard 12V cigarette lighters as well as warning boards as described above to the engineer’s representative and his staff.”

ADD THE FOLLOWING SUBCLAUSES:

“g) Workers

All workers in a work area shall wear high visibility clothing. Workers shall wear their company overalls with reflective jackets at all times.

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h) Defining the Work Area

The work area shall be defined with traffic control facilities as shown on the drawings. Tapers preceding work areas shall be placed so that public traffic has sufficient warning beforehand.

i) Maintenance of the Accommodation of Traffic System

The Contractor shall patrol the road continuously (evenings, weekends and holidays included) control accommodation of traffic systems and equipment and immediately rectify any shortcomings.

The Contractor shall keep record of all accidents, obtain accident reports from the police, take photographs, compile accident reports and submit all to the Engineer. These records shall be handed over to the Project Engineer at the monthly site meetings.

The Contractor shall, in consultation with the Engineer, inspect all road signs twice a day and report to the engineer in writing after each inspection. The reports shall be undersigned by the Resident Engineer and the traffic control and safety office on a daily basis. The Contractor shall submit a report at the monthly site meeting. Failure to refusal on the part of the Contractor to take the necessary steps to ensure the safety and convenience of the public traffic, accommodation of traffic, plant and personnel in accordance with these specifications or as required by statutory authorities or ordered by the Engineer, shall be sufficient cause for the Engineer to impose penalties as follows:

i) A fixed penalty of R1 000,00 per occurrence shall be deducted for each and very occurrence of non-compliance with any of the requirements of Section 1500 of the project specifications.

ii) In addition a time-related penalty of R200,00 per hour over and above the fixed penalty shall be deducted for non-compliance to rectify any defect in the accommodation of traffic within two hours after an instruction to this effect has been given by the Engineer. The engineer’s instruction shall state the time in hours for reinstatement of the defects. Should the Contractor fail to adhere to this instruction, the time-related penalty shall be applied from the time the instruction was given.”

B 1513 ACCOMMODATION OF TRAFFIC WHERE THE ROAD IS CONSTRUCTED IN HALF WIDTHS

ADD THE FOLLOWING:

“Where the road is rebuilt or repaired in half widths, the traffic shall be accommodated as follows:

a) Temporary traffic signals shall be provided where the road is rebuilt in half widths (day and night).

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b) Stop/Go-Ry facilities shall only be used for pavement repairs (i.e. patches, potholes, edge breaks and rutting) crack sealing and texture slurry as well as at sealing operations. In all these instances the road shall be in a safe trafficable condition for two way traffic over the entire width at the end of each day’s work.

The Contractor shall only work on one side of the carriageway where traffic is accommodated in half widths. Work on both sides of the carriageway shall not be allowed where traffic is accommodated in half widths.

All work on the travelled way and shoulders shall be done in such a way that the remaining portion of the roadway is available for traffic.

Construction shall be separated from traffic by means of barricades, guideposts, road signs, delineators and other arrangements required by the Engineer.”

B 1517 MEASUREMENT AND PAYMENTItem Unit

B 15.03 Temporary Traffic Control Facilities

ADD THE FOLLOWING SUBITEMS:

“n) Road signs, TIN Series Square metre (m2)

ADD THE FOLLOWING TO THE FIRST PARAGRAPH:

“For the purpose of the calculation a day shall be regarded as having nine (9) working hours.”

AMEND THE SECOND PARAGRAPH AS FOLLOWS:

“The tendered amount shall include full compensation for all flagmen who are required to control traffic by way of flags and/or portable STOP/GO-RY signs and/or traffic signals and shall include the provision of flags and safety jackets to the flagmen.”

In the title of the third paragraph delete the work “and” between (f) and (h) and add:

“(n)”

ADD THE FOLLOWING ITEM:

Item Unit

B 15.14 Penalty to be deducted for non-compliance withRequirements for accommodation of traffic:

a) Fixed penalty per occurrence...............................................Number (No)

b) Time-related penalty...................................................................Hour (hr)

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.....In subitem B15.14(a) a fixed penalty of R1 000,00 per occurrence shall be deducted for each an every occurrence of non-compliance with any of the requirements of Section 1500 of the Standard Specifications and Section B1500 of Project Specifications.

. .In addition to subitem B15.14(b), a time-related penalty of R200,00 per hour over and above the fixed penalty in subitem B15.14(a) shall be deducted for non-compliance to rectify any defects in the accommodation of traffic within two hours after an instruction to this effect has been given by the Engineer. The Engineer’s instruction shall state the time in hours for reinstatement of the defects. Should the Contractor fail to adhere to the instruction, the time-related penalty will be applied from the time the instruction was given.”

SW 24


B7 SECTION 1600 : OVERHAUL

CHANGE THE FOLLOWING:

B1602(d) Free-haul distance

Restricted overhaul shall not be applicable. The free-haul distance shall be 1,0 km.


DELETE ITEM 16.01

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B8 SECTION 2100 : DRAINS

ADD THE FOLLOWING:

B 2104(a) Materials

(vii)Composite drainage system

The fin drain system shall consist of a geonet drainage core and geopipe enclosed within a geotextile filter jacket. The fin drain shall be supplied prefabricated with geopipe for assembly on site. The fin drain shall have a minimum flow capacity of 0,19 /s per metre (hydraulic gradient of unity and a pressure of 10 KPa) and shall not decrease in thickness by more than 20% under confining pressure of 10 kPa.

a) Geonet Drainage Core

The core shall be non-coroding, rot-proof and manufactured from low density polyethylene with minimum characteristics as follows:-

Mass : 822 g/m²Thickness : 5mmTensile Strength : 2,4 kN/mDischarge capacity : 3,0 /sec under 100 kPa at a

hydraulic gradient of unity

(b) Drainage Pipe

The geopipe to be used in conjunction with the prefabricated fin drain shall be manufactured from high density polyethylene with not less than 60% of the surface perforated.

B 2104(b) Construction of subsoil drainage systems

(v) Composite drainage system

The geopipe shall be placed at the bottom of the geonet with the channel section of the geopipe as the invert of the drain.

The geotextile filter jacket shall then be wrapped around the geopipe and stapled/joined at 300mm intervals. The complete system shall then be placed in the trench ensuring that during backfilling the fin remains vertical.


CHANGE THE FOLLOWING PAYMENT ITEM:

“Item Unit

B 21.11 Composite Drainage System..........................................................................m

SW 26


The composite drain will be measured linearly on slopes overall as laid. No deductions will be made for specials, but deductions will be made for the internal length of manholes. Separate items will be scheduled for different diameters of pipes, where relevant.

The rate shall cover the cost of providing the composite drain and the cost of excavation, laying, bedding, backfilling, jointing and making connections into manholes.”

SW 27


B9 SECTION 2200 : PREFABRICATED CULVERTS

B 2203 MATERIALS

ADD THE FOLLOWING:

“(j) Materials for Reinstatement of Existing Roads and Paved Areas

Where trenches cross existing surfaced roads the following will apply:

(a) The service (pipe, cable etc.) shall be laid on a bedding cradle, and covered with fill blanket.

(b) The remaining portion of the trench, from the top of the fill blanket to the road surface, shall be filled with cellular trench backfill material.

(c) The specification for this material is as follows:-

(i) Definition : Material shall consist of a cellular light-weight concrete incorporating large volumes of controlled micro-air cement and sand.

(ii) Density Range :150 - 1400 kg/m3 and have a equivalent CBR value greater than 100.

(iii) Consistency : Material shall be of a pickable nature after final setting.

(iv) Admixture : The admixture is a pre-foam organic compound accelerated by the addition of calcium chloride. Chloride free additive must be used where the outer casing of the service being covered is metallic.

(v) Setting Times : The finished product must achieve initial set within 90 minutes. It must then be able to carry light traffic.

(vi) Specifications : British Standards draft S.W.P. 146 of July 1990.

(d) The cellular backfill material (hereinafter called “trenchfill”) is ordered from the supplier, and is delivered to site in a truck-mixer. The material is poured directly into the trench, and no vibrating or additional compaction is necessary.

(e) The trenchfill shall be cast flush with the surrounding road surface, and trowelled to an even surface.

(f) After the trenchfill has set, either the same day or the following day, the top 40mm of the trenchfill must be scabbled off using a pick, or paving breaker and the depression reinstated using hot asphalt.

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After compaction, the asphalt must be finished flush with the surrounding road surface.

(g) The asphalt reinstatement of the trench will be carried out by the Municipality or, in the case where the works are being performed by a contractor, the contractor may carry out the reinstatement.

(h) During the time period between pouring the trenchfill into the trench, and the setting of this material, it is imperative that no person or animal be allowed to gain access to the trench. Suitable barricades shall be provided around the trench and a guard placed on duty at the trench until the material sets.

Should the trenchfill not be set by nightfall, safety lamps shall be placed on the barricades.

(i) The responsibility for public safety lies with the organisation carrying out the excavation and backfill operations.”

CHANGE THE FOLLOWING:

B 2212(c) Bricks

Bricks used in stormwater structures shall be:

Burnt clay engineering bricks, having a nominal compressive strength of 28 MPa, and complying with the requirements of SABS 227.

B 2212(j) Pipes into Manholes/Catchpits

Pipes may protrude up to 300mm into a manhole/catchpit. This relaxation will only be permitted if the pipe does not have to be cut. The “dead space” formed at the end of the manhole is to be suitably benched off to prevent the collection of silt and rubbish.

B 2214(g) Benching

DELETE “granolithic plaster” and replace by “concrete topping consisting of a 1:2:3 cement, sand and 7mm stone mix by weight. The sand proportion may be varied between 1,5 and 2,5 to obtain ideal workability.”


B 22.17 Manholes, Catchpits, Precast Inlet and Outlet Structures Complete

DELETE the words “except for excavation and backfilling, which will be measured separately” and replace with “including dealing with any excavation in all materials (including disposal of surplus) which is additional to that measured under the item for pipe trench excavation.”

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B 22.27 Reinstating Trenches Crossing Roads

ADD THE FOLLOWING:

Item Unit

(f) Backfilling trenches using Trenchfill........................................................m³

(g) Backfilling trenches using G5 material compacted to95% Mod AASHTO density.....................................................................m³

(h) Hot asphalt type IVA (min thickness 25 mm)...........................................m²

ADD THE FOLLOWING:

Item Unit

B 22.29 Breaking into existing Manholes.................................................................No

The rate shall include for all labour and materials required for breaking into, laying of pipe, benching where necessary and making good around the pipe and all necessary reinstatement around the manhole on completion of the connection.

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B10 SECTION 2300 : CONCRETE KERBING, CONCRETE CHANNELLING, CHUTES AND DOWNPIPES AND CONCRETE LININGS FOR OPEN DRAINS

B 2302 MATERIALS

ADD THE FOLLOWING TO PARAGRAPH (b):

“Refer to the Municipal Standard Detail Drawings for kerb and channel details”.

DELETE AND REPLACE THE FOLLOWING TO PARAGRAPH (d):

“(d) Bedding Material

The material on which concrete kerbs and channels are to be bedded, shall consist of either a 1:8 cement sand mix or if the layer is more than 50 mm thick, a strength concrete of Grade 20”.

B 2304 CONSTRUCTION

ADD OR CHANGE THE FOLLOWING:

(a) Excavation and preparation of bedding

(i) Kerbs and channels

REPLACE “at least 75 mm thick” with: “10 mm to 50 mm thick”.

(b) Prefabricated concrete kerbing and channelling

ADD THE FOLLOWING:

“After the precast kerbs have been laid the formwork for the channelling shall be set up. Expansion joints shall be allowed for at approximately 8 metres intervals, i.e. opposite the joint between the kerbs.”

(e) “Where the use of a curing compound is approved by the Engineer, the compound shall comply with the relevant requirements of ASTM C309 and be a resin based white pigmented type”.

(l) Machine-Laid Cast-In-Situ (Extruded) Kerbing and Channelling

Before commencing kerb laying on the site, the first 50m length of kerb and channel to be constructed shall be regarded as trial kerb and channel. The Contractor shall demonstrate in the trial length the methods he proposes to use for the construction of the kerb and channel, including joints, texturing, the achievement of a smooth surface and dense fully compacted concrete. It may be constructed either in the recognised position in a road or elsewhere on the site in which case it shall be demolished, broken out and removed at the Contractor’s expense.

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The trial kerb and channel shall be constructed with the plant and equipment to be used on the works and the equipment’s motion forwards and the handwork carried out on the extruded section shall be so controlled and used as to produce a kerb and channel to the shape, lines and levels specified.The time taken to lay the test strip shall be recorded, which in the event of acceptance, shall be used to calculate a rate of extrusion which shall not be exceeded without the permission of the Engineer.

If the concrete in the trial strip fails to meet the test requirements, the Contractor may, at his own cost, cut further cores from the kerb and or channel up to a maximum of one core per 100m length. The strengths obtained on such cores, together with those tested on the instruction of the Engineer, shall be used to test compliance with the strength requirements.

The Contractor may, unless advised of any deficiencies in the trial kerb and channel, proceed with kerbing as soon as acceptable core test results are obtained.

In the event of deficiencies in the trial kerb and channel, the Contractor shall, at his own expense, demolish the rejected sections and remove to the designated tip site and repeat the 50m long trial strip. This process shall be continued until the Contractor has produced kerb and channel in accordance with this specification. He may then proceed with kerb and channel construction proper. Any unacceptable trial length shall be broken out and removed to spoil, at the Contractor’s expense before any subsequent trial length is permitted to commence.

Core test holes shall be filled with 30 MPa concrete mixed with a suitable adhesive compound.

No other means of testing the concrete will be considered and any kerb or channel not complying with all the requirements of the specification shall be broken out, removed to spoil and replaced at the Contractor’s own expense.

The Contractor shall ensure that no change of circumstances or conditions is made to jeopardise the quality of the kerb and channel under construction. If, in the opinion of the Engineer, this does occur, he may order the construction of a further trial length of 50m of kerb and channel in accordance with the requirements of this specification. Work on the kerb and channel proper shall not proceed until a trial strip has been constructed in accordance with the requirements of this specification. No claims for delays will be considered by the Engineer on account of further trial lengths of kerbing being ordered.

Cores shall be taken from the cast or extruded kerbs or channels and tested in accordance with SABS Method 865. The numerical value of the compressive strength of the core used for adjudication shall be that value determined in accordance with Clause 6.3 of SABS Method 865. If, after a set of 3 cores has been tested in an approved laboratory, the

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average crushing strength is found to be less than 20 MPa, the concrete work represented by the cores, will be rejected.


ADD THE FOLLOWING PAYMENT ITEMS:

Item Unit

B 23.16 Variation of tests on Extruded Kerbing

(a) set of three cores....................................................................................No

(b) set of three cubes...................................................................................NoTest results which show that the kerbing fails to comply with the requirements of the specification, will not be measured for payment. If the coring and testing is carried out via the Municipal Road Laboratory, the Contractor will be debited with the cost of the test when the measured compressive strength is less than 20 MPa.

The unit rate shall cover all costs of preparing a test specimen, testing and making good.

Item Unit

B 23.17 Junction with existing Kerb and Channel......................................................m

The unit of measurement for tying new kerb and channel into existing shall be per metre and shall include for all labour and materials necessary to complete the junction.

Item Unit

B 23.18 Motor Slopes

a) Standard Residential Motorslopes, with 3m ramps,as detailed on Drawing No PSMK 7/6....................................................No

b) Extra-over for additional ramp width........................................................m

The rate shall cover the cost of supplying subbase quality material from commercial sources, placing to the required levels, watering and compacting to 95% Mod. AASHTO density, supplying and placing the concrete, forming of joints, screeding and finishing to the required levels.

Item Unit

B 23.19 Pedestrian Ramps

a) Pedestrian Ramps, with floated concrete finish, as shown onon Drawing No PSMK 7/7......................................................................No

b) Pedestrian Ramps, with “bubble block”, as shown onDrawing No PSMK 7/7 & 7/8..................................................................No

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The rate shall cover the cost of supplying subbase quality material from commercial sources, placing to the required levels, watering and compacting to 95% Mod. AASHTO density, supplying and placing the concrete, forming of joints, screeding and finishing to the required levels.

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B11 SECTION 3300 : MASS EARTHWORKS

B 3303 CLASSIFICATION OF CUT AND BORROW EXCAVATION

REPLACE THIS CLAUSE WITH THE FOLLOWING:

(a) Method of Classifying

The Contractor may use any method he chooses to excavate any class of material but his chosen method of excavation shall not determine the classification of the excavation. The Engineer or his Representative will decide on the classification of materials. In the first instance classification will be based on inspection of the material to be excavated and on the criteria given below).

(b) Classes of Excavation

All materials encountered in any excavation for any purpose including restricted excavation will be classified as follows:

(i) Hard rock excavation

Hard rock excavation shall be excavation in material (including undecomposed boulders exceeding 0.17 cubic metres in individual volume) that cannot be efficiently removed without blasting, wedging and splitting, or hydraulic hammers.

This classification includes materials such as:solid unfractured rock occurring in bulksolid ledges thicker than 200mm igneous rock intrusionscemented sedimentary rocks.

(ii) Soft Excavation

Any material which can be removed by bulldozers or backhoes, shall be classified as soft excavation.

Soft excavation shall be material not falling into the category of hard rock excavation.

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B12 SECTION 3400 : PAVEMENT LAYERS OF GRAVEL MATERIAL

B3407 MEASUREMENT AND PAYMENT

Item Unit

B 34.01 Pavement layers constructed from gravel obtained from commercial sources

ADD THE FOLLOWING:

“The tendered rates shall include full compensation for procuring, furnishing and placing all gravel material and for hauling the material over an unlimited free-haul distance.”

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B13 SECTION 3600 : CRUSHED – STONE BASE

B3602 MATERIALS

a) Requirements for crushed aggregate

ADD THE FOLLOWING AFTER THE FIRST PARAGRAPH:

“If the material obtained from a commercial source doesn’t meet specifications in terms of the PI any addition of lime shall be for the Contractors cost.”

AMEND THE SECOND SENTENCE AS FOLLOWS:

“Sampling shall be in accordance with Section 8100. The aggregate shall not contain more than 0,1% by mass of unwanted material such as wood, coal or similar organic material. Aggregate shall not contain more than 2% by mass of free mica especially muscovite, obtained by visually separating the particles or more than 4% by volume obtained from microscope slices. Only aggregate containing mica, such as granite, gneiss, mica schist, pegmatite or sandstone or mica intrusions need to be evaluated. Soft or weathered particles must be controlled by the Durability Mill Index values specified in table 3602/1 under Durability.”

ADD AFTER THE LAST SENTENCE THE FOLLOWING:

“Rocks containing easily detectable quantities (more than 15) of olivine, serpentine and sulphide minerals, such as pyrites and marcasite, must be considered with caution, and may warrant additional evaluation to the satisfaction of the Engineer.”

Table 3602/1

Atterberg limits (minus 0,075 mm fraction)

Delete the sentence describing the Atterberg limits for the –0,075 mm fraction for G1 and G2 materials in Table 3602/1, and replace with the following:

“The P1 shall not exceed 8. If the P1 exceeds 8 the material shall be washed and/or chemically modified. After modification the P1 of the minus 0,075 mm fraction shall not exceed 6.”

Durability requirements

ADD THE FOLLOWING:

“For Basic crystalline rocks, Arenaceous rocks, Argillaceous rocks and Diamictites the Durability Mill Index (DMI) shall be less than 125. For all other rock types the Durability Mill Index (DMI) shall not be more than 420 subject to the % passing the 0,425mm sieve not increasing by more than 8 percentage points during the Durability Mill test.”

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Compaction requirements

Delete “85% of bulk relative density” and replace with “88% of apparent relative density”

(c) Grading requirements

Delete the third paragraph from “and” after “clause 3603 “and all other paragraphs up to the end of (iv). (This in cases where an aggregate source had been utilized with success in the past but these additional requirements cannot be met).

ADD THE FOLLOWING NEW SUBCLAUSE:

“(e) Ethylene glycol durability index

The ethylene glycol durability index shall not exceed the value of 4.”

B 3604 CONSTRUCTION

(b) Compaction

ADD THE FOLLOWING AT THE END OF THE FIRST PARAGRAPHS:

“The specified density shall also be obtained in the upper 50mm of the layer.”

(k) Stabilisation

Where indicated by the Engineer, the crushed material (G1) shall be mixed with a grader. Cement (1%) and 3% of 60% anionic stable-grade emulsion shall be added to the virgin material.

The mixed material shall be placed and compacted within 5 hours of the commencement of mixing.

The mixed material shall be compacted to a minimum of 100% of modified AASHTO density.

B 3606 CONSTRUCTION TOLERANCES

ADD THE FOLLOWING:

“The grade shall be such that the height of the edge of the channel above the top of the completed base is not less than the minimum thickness of asphalt surfacing, ie 5 mm less than the specified thickness.”

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B14 SECTION 4100 : PRIME COAT

ADD OR CHANGE THE FOLLOWING:

B 4102 MATERIALS

a) Priming Material

The priming material used shall be MC-30 cut-back bitumen to SABS 308.

B 4105 PREPARATION OF THE LAYER TO BE PRIMED

Where the previously primed surface has become unsuitable the Engineer’s Representative may order a tack coat to be applied prior to the bituminous surface being applied.

B 4106 APPLICATION OF PRIME COAT

ADD THE FOLLOWING TO PARAGRAPH (C)

“MC-30 prime shall normally be applied at a rate of 0,7 l/m².”

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B15 SECTION 4200 : ASPHALT BASE AND SURFACING

B 4202 MATERIALS

B 4202 (b) Aggregates

ADD THE FOLLOWING PARAGRAPH TO THE INTRODUCTORY DESCRIPTION:

“Asphalt mixes shall be manufactured using different individual single size coarse aggregates fractions and crushed fine aggregates blended to conform to the specified grading requirements. The use of natural sands shall only be permitted if approved by the engineer and shall be limited to a maximum of 5% for continuously graded mixes. All aggregate in excess of 4,75 mm shall consist of individual nominal single sized aggregate. For stone mastic asphalt mixes all aggregate fractions in excess of 2,36 shall consist of individual single size fractions. Contractors shall note that commercial suppliers may not be able to supply all the required single size aggregates, in which instance arrangements will have to be made for additional on site screening. No additional payment shall be made for screening aggregate. The use of run of crusher type materials shall not be permitted.

(v) Absorption

ADD THE FOLLOWING NEW SENTENCE

“ In addition, the total binder absorption of the combined coarse and fine aggregate blend shall not exceed 0,5%”

(viii)Grading

DELETE THE SECOND PARAGRAPH COMMENCING WITH "THE TARGET GRADING…" AND ADD THE FOLLOWING PARAGRAPHS * (DELETE WHAT IS NOT APPLICABLE)

“The grading limits for the combined aggregate grading for the asphalt base shall be as specified in table 4202/6: Continuously graded 26,5m maximum.

The grading limits for the combined aggregate grading for the asphalt surfacing shall be as specified in table 4202/7: Continuously graded medium grade.

(c) Fillers

DELETE THE SECOND LAST SENTENCE OF THE FIRST PARAGRAPH AND REPLACE WITH:

“With the exception of stone mastic asphalt, in no instances shall more than 2% by filler be used in the mixes”

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ADD THE FOLLOWING AFTER THE LAST PARAGRAPH:

“For tender purposes the active filler shall be hydrated lime”

(h) General

ADD THE FOLLOWING AFTER THE SECOND PARAGRAPH:

“Sufficient aggregate for a minimum of 3 days production shall be separately stockpiled and tested for conformance and uniformity prior to use. The test results shall be presented to the engineer”

B 4203 COMPOSITION OF ASPHALT BASE AND SURFACING MIXTURES

IN THE FIRST PARAGRAPH, THIRD LAST LINE, AFTER “OR ACTIVE FILLER” ADD:

“or aggregate content”

DELETE THE FIFTH PARAGRAPH AND REPLACE WITH THE FOLLOWING:

“The design of the asphalt mixes shall be in accordance with “Interim Guidelines For The Design Of Hot-Mix Asphalt In South Africa (June 2001)”, and appropriate research results. The mix properties and requirements shall be as specified in the project specifications”

The relevant asphalt mixes for the base and surfacing layers shall comply with the requirements in table B4203/2.

Table B4203/2Asphalt mix requirements: Base and Surfacing

Property Continuously graded base

mixes

Continuously graded

surfacing mixes

Stone mastic asphalt mixes

Marshall Stability (kN) 8 – 18 8 – 18 -Marshall Flow (mm) 2 – 6 2 – 6 -Stability /Flow (kN/mm) >2,5 > 2,5 -VMA (%) > 14 > 15 > 17VFB (%) 65 – 75 65 – 75Air voids (%) 4 – 6 4 – 6 3 – 5Indirect tensile strength @ 25oc (kPa)

> 1000 > 1000 > 400

Dynamic Creep Modules @ 40oC (mPa)

> 20 > 20 -

Modified Lottmann* (TSR) > 0,7 > 0, 8 > 0,7Air permeability @ 7% voids (cm2) < 1 x 10 –8 < 1 x 10 –8 <1 x 10 –8

Binder film thickness (microns) 5,5 – 8,0 5,5 – 8,0 -Filler bitumen ratio 1 – 1,5 1 – 1,5 -

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B 4203 DESIGN ASPHALT

ADD THE FOLLOWING:

“A continuously graded medium mix using a 80/100 Pen. bituminous binder and local quartzitic aggregate is required. The Type IVa (Asphalt Institute) hot mix produced locally by Colas Ltd is suitable.”

B 4205 GENERAL LIMITATIONS AND REQUIREMENTS AND THE STOCKPILING OF MIXED MATERIAL

(c) Surface Requirements

(iii) Tack Coat

ADD THE FOLLOWING NEW PARAGRAPH:

“Hand spraying shall only be permitted on areas approved by the engineer. The binder distribution shall be capable to apply the binder evenly over the full area. The equipment shall comply with clause 4103. Tack coat shall be applied to all transverse and longitudinal joints by hand utilizing a paint brush.”

B 4206 PRODUCING AND TRANSPORTING THE MIXTURE

b) Production of the mixture

(ii) Using drum-type mixer plants:

ADD THE FOLLOWING:

“Pre blending of aggregate fractions shall not be permitted and the contractor shall ensure that sufficient cold-feed bins are installed to accommodate each individual aggregate fraction, including the filler.”

(c) Transporting the mixture

ADD THE FOLLOWING PARAGRAPH:

“Special precautions shall be taken by the contractor to ensure that the temperature of the total mass of asphalt does not decrease by more than 10oC from point of dispatch to the point where it is to be paved. The use of the thermal blankets is obligatory.”

ADD THE FOLLOWING NEW SUBCLAUSE:

“(f)Approval of asphalt mixture

Before any asphalt is placed on the road, the engineer shall approve the mix design. The approval process shall be as follows:

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The contractor shall prepare and submit a laboratory design mix with test results at four different bitumen contents. The design mix shall be submitted on the prescribed form D3 of TMH 10: “Instruction for the Completion of As-Built Materials Data Sheets” with all the necessary test results completed. In addition, the proposed asphalt mixture shall be subjected to gyratory testing. All the expenses in preparing and submitting the laboratory design mix shall be to the contractors cost.

Samples of all aggregate and bitumen shall be submitted with the laboratory design mix to enable the engineer to carry out check design testing as necessary. The above design and aggregate shall be submitted to the engineer at least six weeks before it is intended to commence with any asphalt production.

After approval is obtained for the laboratory design mix, a plant mix at varying binder contents of approximately 5 to 10 tons each shall be produced. The purpose of the plant mix is for the contractor to prove that the laboratory design mix can be produced successfully. The engineer shall conduct the necessary testing on the plant mix. The plant mix shall not be placed on the road. During the production of the plant mix, the engineer shall be afforded the opportunity to inspect the asphalt plant.

After the plant mix is approved, permission shall be given for laying a trial section at varying binder contents in accordance with the requirements of section 4211 of the specifications. The Engineer may require that the mix be further assessed by means of CSIR Wheel Tracking or MMLS testing, the cost of which will be borne by the Employer. Mass production of asphalt shall only commence after approval of the trial section, which should be given within a maximum of ten days.

The engineer may instruct the contractor at any time to halt his paving process and to review the whole or part of the above process should a change of aggregate properties occur, the specified asphalt requirements not being met and/or a consistent asphalt mixture not be produced.”

B 4208 JOINTS

ADD THE FOLLOWING TO THIS CLAUSE:

“Where the difference in level between the new work and the existing road surface exceeds 25mm, joints shall be treated as follows:

Transverse steps at the end of a day’s work shall be tapered off at a slope of 1 vertical to 20 horizontal (1:20) to tie in with the existing surface. The tapered section shall be removed before surfacing is recommenced and a joint formed in accordance with clause 4208 of the specification.

Longitudinal joints exposed to traffic shall be provided with a taper of compacted asphalt material over the full length of the exposed joint. The width of the taper shall be at least 5 times the difference in level between the old and new work.

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All costs involved in the provision and removal of these temporary ramps shall be deemed to have been included in the rates tendered for the relevant asphalt pay item.

B 4209 PRE-COATED CHIPPINGS FOR ASPHALT SURFACINGS

IN THE FIRST SENTENCE OF THE FIFTH PARAGRAPH, DELETE 6-8 KG/M2 AND 7-9KG/M2 RESPECTIVELY AND REPLACE WITH:

“3-4 kg/m2 and 5-6 kg/m2”

In the last sentence of the fifth paragraph, delete “between 0,6 and 1,0 mm” and replace with:

“between 0,8 and 1,2mm”

B 4210 COMPACTION

ADD THE FOLLOWING:

“The densities of all cores shall be equal to or greater than the 95% Marshall Density, for the lot to be acceptable.”

B 4213 CONSTRUCTION TOLERANCES AND FINISH REQUIREMENTS

ADD THE FOLLOWING TO PARAGRAPH (a)(iv):

“Notwithstanding these allowances, at no place shall the level of the top of the asphalt surface fall below that of the adjacent low side concrete channel.”

B 4214 QUALITY OF MATERIAL AND WORKMANSHIP

(b) Coring of asphalt layers

ADD THE FOLLOWING:

“A suitable coring machine shall be available on a daily basis when asphalt paving is taking place. Cores shall only be drilled, when the road temperature is 20oC or less. Core holes shall be filled with hot mix asphalt and compacted, all within 24 hours of the core being drilled. Coring shall be carried out within 48 hours after the paving has been completed and supplied to the engineer. The test results of cores shall be submitted to the engineer within 24 hours after coring.”

(c) Routine inspection and tests

ADD THE FOLLOWING PARAGRAPH:

“The contractor shall keep accurate records of:

(i) The position where every truckload of asphalt is paved (chainage, lane, time a and date).

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(ii) The temperatures of the asphalt in the trucks both at the mixing plant and at the paving equipment immediately prior to discharging the load.

(iii) The truck number from which control samples are taken. All samples taken shall be appropriately numbered."

ADD THE FOLLOWING SUBCLAUSE:

(a) Special tests

n-Heptance-Xylene Equivalent (Spot test) (AASHTO-T102)

If the engineer suspects that bitumen or asphalt has been overheated, he may order that the bitumen, or the bitumen recovered from the asphalt, be subjected to the Spot Test. Recovery of binder for use in the Spot Test shall be carried out according to an approved method.

Any bitumen having an n-Heptance-Xylene equivalent in excess of 36, or in excess of the manufacturers test result on the dispatched stock, shall be considered to have been overheated and shall be deemed to be rejected unless proven otherwise."


AMEND THE FOLLOWING PAYMENT ITEM:

Item Unit

“B42.08 100mm cores in asphalt paving................................. number (no)

“AMEND THE 1ST SENTENCE BY ADDING THE FOLLOWING AFTER THE WORD “DRILLED …..”:

“irrespective of depth of core.”

B42.11 Asphalt constructed for rehabilitation

purposes in accordance with the provisions of subsubclause 4213 (f)(ii)............................................................ton....................................................................................................................................................................................................................................................................................................................................................................................................................................................ton.....................................................................................................................................................................................................................

INSERT THE FOLLOWING PARAGRAPHS AFTER THE 1ST PARAGRAPH

“The unit of measurement for sub item (a) shall be the ton of asphalt base placed in compacted layer thickness not exceeding 60mm, and measured according to certified weighbridge tickets issued in respect of the mixture used.

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The unit of measure for sub item (b) shall be the ton of asphalt overlay placed to the nominal thickness specified and measured according to certified weighbridge tickets issued in respect of the mixture used.

No payment shall be made for excess width and wastage of asphalt, and the mass of such excess or wasted material shall be deducted from the recorded delivery for payment purposes. No payment shall be made for asphalt in excess of the mean spread rate(s), which shall be determined as follows:

S = 1000 m2/ton where,AXB

S = Mean spread rate in m2/ton

A = Average bulk relative density achieved on the road in ton/m3

B = (specified asphalt thickness in mm) + 5mm”

ADD THE FOLLOWING TO THE 3RD PARAGRAPH

“The tendered rate shall also include full compensation for joint forming, temporary ramping of construction joints between paving operations when new work is opened to traffic (including ramping material), breaking up and disposal of temporary ramps and waste material, weighing the material on the specified weighbridge and cleaning the surface”

ADD THE FOLLOWING NEW PAYMENT ITEMS:

“Item Unit

Unit

B42.21 Aggregate variations...........................................................ton (t)

The unit of measurement in respect of increases or decreases in the aggregate content from that specified in the nominal mix shall be the ton.

Payment for variations shall be made as specified for clause 1213”

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B16 SECTION 5600 : ROAD SIGNS

B 5602 MATERIALS

ADD THE FOLLOWING:

(l) Street name boards shall be as specified on Municipal Standard Detail Drawings SMM 53. Poles shall be erected at the positions shown on the drawings and name blades attached as ordered. The correct spelling of the names of the streets, etc to appear on the blades will be supplied in writing by the Engineer.

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B17 SECTION 5800 : LANDSCAPING AND PLANTING PLANTS

B 5802 MATERIALS

REPLACE PARA (a) WITH THE FOLLOWING:

(a) Fertiliser/soil improvement material for trees.

The required hole size per tree is 1 m³.

The soil and fertiliser mix shall consist of the following:

40% red soil

50% black soil

500 g super phosphate

10% mushroom compost

ADD THE FOLLOWING TO PARA (d):

(d) Trees and scrubs

“Trees will be selected and sourced by the Manager Parks, NMBMM Environmental Services. The contractor shall collect the trees from the nursery for planting on site. All funding needs to be provided by the project. The spacing and types of trees is to be confirmed by the Parks Department.

An irrigation system with drip irrigation to the Parks Department approval, needs to be installed with the trees.”

ADD THE FOLLOWING TO PARA (e)

(e) Grass sods

“The contractor will be responsible for sourcing and supplying grass sods. The type of grass to be planted is Cynodon dactylon (Kweek grass)”.

B 5804 PREPARING THE AREAS FOR PLANTS

ADD THE FOLLOWING TO PARA (d)

“The area to be grassed shall be prepared by applying 2:3:2 fertilizer at the rate of 60 grams/m² and raked gently into the soil surface”.

B 5806 PLANTING AND MAINTAINING THE PLANTS

ADD THE FOLLOWING TO PARA (a)

“In cases where the centre of a traffic circle is grassed and/or treed and/or planted with shrubs, a 40-50 mm dia PVC sleeve must be installed to link the island with the nearest water system for irrigation purposes. Irrigation requirements or the traffic circle will be supplied by the Parks Department”.

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5809 MEASURING AND PAYMENT

Item Unit

B58.09 Trees and Shrubs

a) Planting and establishing

(i) Trees.................................................................................................No

ADD THE FOLLOWING:

“The rate shall include full compensation for collecting the trees at the municipal nursery, transport to the site, excavating the holes as well as the supply of the soil and fertiliser mix complete as per B5802”.

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B18 SECTION 7300 : CONCRETE BLOCK PAVING FOR ROADS


ADD THE FOLLOWING:

“Item Unit

B 7304 Street furniture

(a) Tree guard...........................................................................................No

(b) Concrete waste bin..............................................................................No

(c) Concrete bollard...................................................................................No

(d) Concrete bench....................................................................................No

Tendered rate shall include full compensation for the supply, manufacture and installation of the items complete as shown on drwg no 21296QOA/02.T. The reinforcing for the concrete bench will be measured separately.”

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B19 SECTION 8100 : TESTING MATERIALS AND WORKMANSHIP

B8117 MEASUREMENT AND PAYMENT

ADD THE FOLLOWING:

Item Unit

B81.04 Testing materials and workmanship

a) Testing as required by the Engineer............................Prov. Sum

b) Handling costs and profit in respect of sub-item B81.04(a)..............................................................Percentage %

The provisional sum provided to cover the cost of tests as requested by the engineer in terms of clause 8115 shall be expended in accordance with the provisions of the general conditions of contract. Payment will not be made for any test, should the test indicate that the specifications have not been complied with.

The tendered percentage is a percentage of the amount actually spent under subitem B81.04 (a), which shall include full compensation for the handling costs and the profit of the contractor.

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