Construction World December 2018

The Community Liaison comprised of an Open House before the tender stage in order to ensure that all Community and Interested and Affected Party interests and inputs were allowed for in the design and Contract stipulations as far as possible. Community Liaison Meetings were held at a local church venue every two months throughout the Project and these proved invaluable. An Environmental Management Plan was drawn up prior to the tender going out and the Contractor had to adhere strictly to this. This was enforced by independent Environmental Control Officers who were Ross Holland and Melanie Weber of Holland & Associates. They had the power to impose severe penalties on the Contractor for any non-conformances. One extremely beneficial but previously unforeseen benefit of this Project was that the quality of the seawater along the False Bay Coastline improved markedly after construction. Many of the sewers running under Main Road were approaching 100 years old and had virtually corroded away over time. This meant that the sewage was actually running in the ground in many places and thus was discharging into the nearby sea water. The replacement and/or rehabilitation of the sewers cured this problem and led to a large reduction in the e-coli count in False Bay near the project. Health & Safety Compliance with Occupational Health and Safety Act 1993 and Construction Regulations 2003 issued in terms of Section 43 of the Act were adhered to throughout the project. Additional consideration was taken into account when working within the rail environment. The Provincial Railway Association of South Africa’s specification for works on, over, under or adjacent to railway lines and near high voltage equipment (E7/2) was adhered to fall operations within the rail reserve. A full time rail safety office over and above the health and safety officer on site was employed to enforce compliance. Some areas of works required occupation of the railway line which was done at night to minimise disruptions to rail services. The Main Road had to remain open to traffic at all times. Where applicable, traffic was controlled using a traffic signal Stop-Go system operated from a central control office. A CCTV monitoring system with a live feed to the central control office was installed, which served as both a security measure, balancing of queue lengths as well as a tool for the monitoring of the works. Innumerable measures were taken to ensure that none of the bulk services were disrupted during the maintenance of sewer, stormwater and water services to all the properties adjacent to Main Road - including side streets. Quantifiable time, cost and quality The contract was awarded for the amount of R162 505 693,38 and the commencement date of the contract was 17 February 2014. This amount included contingencies and VAT but excluded contract price adjustment. The foundation of the wall was estimated to take 27weeks with six piling rigs. Uretek grout stablilisation took seven weeks and was done with minimum disturbance to the constructions operations this resulted in related costs of five months. The piles would need to be completed before the mass concrete but with chemical stabilisation the first layer of mass concrete was placed first to aid the process. An additional amount of funding was added to the Project budget to allow for the Preliminary and General Costs arising from the 6 month extension of time due to the delay in obtaining approval for the large retaining wall from PRASA. Further funding was added to allow the construction of additional works such as the Point Parking Area at Kalk Bay and other smaller items. Phase 3 was timeously completed within the final allowed budget, which was increased to allow for the abovementioned additional works added to the Contract and the Completion Certificate was issued in January 2018 as per the Project Programme.

Risk management The nature of the project meant that there were substantial risks involved with hugely severe consequences of failure. The presence of solid rock meant that rock breaking using machines as well as micro blasting had to be carried out virtually alongside the fragile existing main. This water main is the only water supply line to the whole of the Deep Southern Cape Peninsula and the reservoirs had only 24 hours capacity in summer. Failure of this line would have meant cutting off the water sup¬ply to this area for an extended period of time, which was obviously simply unthinkable. With the onset of the drought towards the latter half of the project, needless water loss could not be tolerated. A further consequence of failure would have been the destruction of Main Road and the adjacent railway line, which would have cut off two of only four transport routes to this area. A similar situation applied to all of the other Services such as sewer rising mains, gravity sewers stormwater systems and communication ducting. Loss of any of these would have had absolutely disastrous consequences for residents and businesses both along and south of the Project route. Roger Hendry acted as the Specialist Geotechnical Sub-consultant for the Soil Stabilisation and foundation works on the Clovelly Retaining Wall. He was involved in the geotechnical investigations as well as the monitoring and approval of the stabilised areas that were used for founding of the retaining wall. 

PROJECT INFORMATION • Company entering: Knight Piésold Consulting • Client: City of Cape Town Roads and Stormwater Department • Project value: R162 505 693 • Start date: February 2014 • End date: January 2018 • Main Contractor: Martin & East • Architect: City of Cape Town Urban Design (Landscape Architect) • Quantity Surveyor: Martin & East • Consulting Engineer: Knight Piésold Consulting

Construction WORLD

2 18 BEST PR O JECTS

49