pre feasibility assessment
TRANSCRIPT
POWER DELIVERY SUBSTATION ENGINEERING
Central Grid Substation Access Road Upgrade Project
Assessment Report
Prepared by: Michael Matshona and team
Date: 18/04/2013
Contents
1. Background ............................................................................................................................... 3
2. Substation Access Roads ........................................................................................................... 3
2.1. Glockner ............................................................................................................................. 3
2.2. Makalu ............................................................................................................................... 5
2.3. Rigi ..................................................................................................................................... 6
2.4. Verdun ............................................................................................................................... 8
2.5. Taunus ............................................................................................................................... 9
2.6. Benburg ........................................................................................................................... 11
2.7. Nevis ................................................................................................................................ 12
2.8. Scafell .............................................................................................................................. 14
2.9. Snowdon .......................................................................................................................... 15
2.10. Kookfontein ..................................................................................................................... 17
3. Conclusion ............................................................................................................................... 18
1. Background
The Civil Engineering Department within Substation Engineering was approached to conduct an
assessment of the condition of 10 central grid substation access roads. The need for the assessment
arose from concerns about the safety of employees that have experienced difficulties when driving
into the various substations particularly during adverse weather conditions.
The substations affected are: Glockner, Makalu, Rigi, Verdun, Taunus, Benburg, Nevis, Scafell,
Snowdon and Kookfontein.
The purpose of this report is to give clarity and expert opinion on the conditions of the roads and to
provide a more detailed scope of works to be done on each road.
After visits to all the sites it was concluded that, geotechnical investigations and surveys are required
for all the substations mentioned above. Scafell and Kookfontein require new road designs. The
other 8 substations require resurfacing.
2. Substation Access Roads
2.1. Glockner
2.1.1. Site Location
Provincial road Intersection co-ordinates: 26°36'01.49"S; 27°59'20.27"
Substation co-ordinates:26°36'15.42";27°59'14.4"
Road Name: Dolly Avenue
Figure 1-Glockner Substation Locality Plan
Figure 2-Glockner Access Road Condition
2.1.2. Scope of Works
Repairing and resurfacing of the access road. The length of the road is 297m. Wayleaves are
required.
Design Requirements
1. Survey the access 297 m long with 20m on each side of the shoulder
2. Civil design GBE to do Geotech. investigation and provide a Geotech Report .
3. Apply for the Wayleaves from the relevant authorities such Sanral , Roads Department
whether District/ Local or National
Access Road
1. Remove the existing top layer of the road surface
2. Check the conditions of the existing layers such as subbase and subgrade
3. Check the drainage and provide any remedies needed
4. Repair any cracked stormwater drains and provide subsoils where necessary
2.2. Makalu
2.2.1. Site Location
Provincial road Intersection co-ordinates: 26°49'26.32"S; 27°54'09.68"
Substation co-ordinates:26°49'21.35";27°54'37.31"
Road Name: R82
Figure 3-Makalu Access Road intersection with R82
Figure 4-Makalu Access Road Condition
2.2.2 Scope of Works
Repairing and resurfacing of the access road from the Substation gate to intersection with R82. The
length of the road is 60m. Wayleaves are required.
Design Requirements
1. Survey the access 60 m long with 20m on each side of the shoulder
2. Civil design GBE to do Geotech. Investigation and provide a Geotech Report .
3. Apply for the Wayleaves from the relevant authorities such Sanral , Roads Department
whether District/ Local or National
Access Road
1. Remove the existing top layer of the road surface
2. Check the conditions of the existing layers such as subbase and subgrade
3. Check the drainage and provide any remedies needed
4. Repair any cracked stormwater drains and provide subsoils where necessary
2.3. Rigi
2.3.1. Site Location
Provincial road Intersection co-ordinates: 26°40'53.81"S; 27°51'21.78"
Substation co-ordinates:26°40'45";27°51'28"
Figure 5-Rigi Location
Figure 6-Rigi Access Road condition inside Sustation
Figure 7-Rigi Access Road condition outside Substation
2.3.2. Scope of Works
Repairing and resurfacing of the access road. The length of the road is 309m. Wayleaves are not
required.
Design Requirements
1. Survey the access 309 m long with 20m on each side of the shoulder
2. Civil design GBE to do Geotech. Investigation and provide a Geotech Report .
3. No Wayleaves required
Access Road
1. Remove the existing top layer of the road surface
2. Check the conditions of the existing layers such as subbase and subgrade
3. Check the drainage and provide any remedies needed
4. Repair any cracked storm water drains and provide subsoil where necessary
5. Resurface the access road from inside the station
2.4. Verdun
2.4.1. Site Location
Provincial road Intersection co-ordinates: 26°38'28.03"S; 27°57'19.23"
Substation co-ordinates:26°38'22.11";27°57'8.082"
Road Name: Van Riet Lowe (M61)
Figure 8-Verdun Locality Plan
2.4.2. Scope of Works
Repairing and resurfacing of the access road. The length of the road is 80m.
Design Requirements
1. Survey the access 80m long with 20m on each side of the shoulder.
2. Civil design GBE to do Geotech. Investigation and provide a Geotech Report.
3. Apply for the Wayleaves from the relevant authorities such Sanral, Roads Department
(District/ Local or National where applicable)
Access Road
1. Remove the existing top layer of the road surface
2. Check the conditions of the existing layers such as subbase and subgrade
3. Check the drainage and provide any remedies needed
4. Repair any cracked stormwater drains and provide subsoils, culverts and channels that are
necessary.
2.5. Taunus
2.5.1. Site Location
Provincial road Intersection co-ordinates: 26°16'20.33"S; 27°46'47.87"
Substation co-ordinates:26°16'4.073";27°46'46.76"
Road Name: R559
Figure 9-Taunus Access Road Intersection with R559
Figure 10-Taunus Access road condition
2.5.2. Scope of Works
Repairing and resurfacing of the access road. The length of the road is 253.4m.
Design Requirements
1. Survey the access 253.4 m long with 20m on each side of the shoulder
2. Civil design GBE to do Geotech. investigation and provide a Geotech Report .
3. Apply for the Wayleaves from the relevant authorities such Sanral , Roads Department
whether District/ Local or National from the intersection to the beacon P241-1 which is
377.5 m from the intersection .
Access Road
1. Remove the existing top layer of the road surface
2. Check the conditions of the existing layers such as subbase and subgrade
3. Check the drainage and provide any remedies needed
4. Repair any cracked stormwater drains and provide subsoils where necessary
5. Resurface the access with bitumen material
2.6. Benburg
2.6.1. Site Location
Substation co-ordinates:26°06'25.999";28°21'19"
Road Name: Jarrah Road
Figure 11-Benburg Locality Plan
Figure 12-Benburg Access Road condition
2.6.2. Scope of Works
Repairing and resurfacing of the access road. The length of the road is 235.2m.
Design Requirements
1. Survey the access 235.2 m long with 20m on each side of the shoulder
2. Civil design GBE to do Geotech investigation and provide a Geotech Report
3. Apply for the Wayleaves from the relevant authorities such Sanral , Roads Department
(District/ Local or National, where applicable)
Access Road
1. Remove the existing top layer of the road surface
2. Check the conditions of the existing layers such as subbase and subgrade
3. Check the drainage and provide any remedies needed
4. Repair any cracked stormwater drains and provide subsoils, culverts and channels that are
necessary.
2.7. Nevis
2.7.1. Site Location
Provincial road Intersection co-ordinates: 26°38'28.03"S; 27°57'19.23"
Substation co-ordinates:26°14'31.08";28°32'22.68"
Figure 13-Nevis Access Road
Figure 14-Nevis Acces Road Condition
2.7.2. Scope of Works
Repairing and resurfacing of the access road. The length of the road is 722.8m.
Design Requirements
1. Survey the access 722.8 m long with 20m on each side of the shoulder
2. Civil design GBE to do Geotech investigation and provide a Geotech Report.
3. Do not require Wayleaves.
4. Require permission from farm owner since the access road runs through a farm.
Access Road
1. Remove the existing top layer of the road surface
2. Check the conditions of the existing layers such as subbase and subgrade
3. Check the drainage and provide any remedies needed
4. Repair any cracked stormwater drains and provide subsoils, culverts and channels that are
necessary.
2.8. Scafell
2.8.1. Site Location
Provincial road Intersection co-ordinates: 26°49'13.58"S; 27°38'46.55"
Substation co-ordinates:26°48'45.63";27°38'14.51"
Beacon no. P5672 (37) is approx. 51.3 m away from the centre of the access road.
Figure 15-Scafell Substation Locality Plan
Figure 16-Scafell Access Road condition
2.8.2. Scope of Works
New Tar Road is required. The length of the road is 1525m.
Design Requirements
1. Survey the access 1525 m long with 20m on each side of the shoulder
2. Civil design GBE to do Geotech Investigation and provide a Geotech Report.
3. Apply for the Wayleaves from the relevant authorities such Sanral , Roads Department
(District/ Local or National where applicable)
Access Road
1. Based on the survey design the access road, drainage and channels
2. For the access road design the layers such as subbase and subgrade.
3. Check the drainage and provide any remedies needed
4. Repair any cracked stormwater drains and provide subsoils, culverts and channels that are
necessary.
2.9. Snowdon
2.9.1. Site Location
Provincial road Intersection co-ordinates: 26°31'43.57"S; 28°09'02.13"
Substation co-ordinates:26°31'53";28°09'2.9988"
Road Name: Scorpion Street & R557
Figure 17-Snowdon Locality Plan
2.9.2. Scope of Works
Repairing and resurfacing of the access road. The length of the road is 61m.
Design Requirements
1. Survey the access 61m long with 20m on each side of the shoulder.
2. Civil design GBE to do Geotech. Investigation and provide a Geotech Report.
3. Apply for the Wayleaves from the relevant authorities such Sanral, Roads Department
(District/ Local or National where applicable)
Access Road
1. Remove the existing top layer of the road surface
2. Check the conditions of the existing layers such as subbase and subgrade
3. Check the drainage and provide any remedies needed
4. Repair any cracked stormwater drains and provide subsoils, culverts and channels that are
necessary.
2.10. Kookfontein
2.10.1. Site Location
Substation co-ordinates:26°35'13.96";27°59'17.99"
Road Name: M61
Figure 18-Kookfontein Locality Plan
Figure 19-Kookfontein Access Road Condition
2.10.2. Scope of Works
New Tar Road is required. The length of the road is 1000m.
Design Requirements
1. Survey the access 1000 m long with 20m on each side of the shoulder
2. Civil design GBE to do Geotech Investigation and provide a Geotech Report.
3. Apply for the Wayleaves from the relevant authorities such as Sanral , Roads Department
(District/ Local or National, where applicable)
Access Road
1. Based on the survey design the access road, drainage and channels.
2. For the access road design the layers such as subbase and subgrade.
3. Check the drainage and provide any remedies needed
4. Repair any cracked stormwater drains and provide subsoils, culverts and channels that are
necessary.
3. Conclusion
The scope of works has been sent to the Land Surveying and Geotechnical departments. Both
departments require WBS numbers to conduct the topographical surveys and geotechnical
investigations on all the access roads. The designs and costing of all the access roads are based on
the findings of both departments.