2 project description -...

EIA NHDC Project Cap Malheureux

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2 PROJECT DESCRIPTION

2.1 Location

The project site is located at Pavillon, Cap Malheureux, in the district of Rivière du

Rempart. It borders the Vingt Pieds Road (B45. Fig. 2.1 , an extract of the 1:25,000 Map of

Mauritius, illustrates the geographical location of the proposed site. Fig. 2.2 is a Google

satellite image of the site location, and Fig.2.3 gives an aerial view of the site after

construction. The site may also be approached from the Mon Choisy-Cap Malheureux Road

(B13).

The plot of land representing the project site has an extent of 11,463 m2 (1.1463 ha), and its

northern boundary is at some 515m from the sea.

2.2 Project Proponent & Site Ownerhip

The site is owned by the NHDC, the Project proponent.

ANNEX 1 provides a copy of the Title Deed.

The following consulting firms have been enlisted for the development / construction of the

proposed project:

Architect / Team Leader Marc Foo Kune (Design Forum)

M&E Services PRO-FIVE Ltd

Civil / Structural / EIA Services LUXCONSULT (Mtius) Ltd

Quantity Surveyors

2.3 Description

2.3.1 Main project components

The project consists primarily in the construction of 66 apartments for the middle-income

group, split into four (4) building blocks A,B,C and D, with a total ground floor area of

2199 m2 equivalent to 19% of plot coverage. The apartments will be of two(2) and three(3)

bedroom types, with the two-bedroom option sub-divided into two types – Type 1 and Type

2.

It is proposed to construct 36 no. 3-bedroom apartments, 12 no. 2-bedroom apartments

(Type 1) and 18 no.2-bedroom apartments (Type 2).

The project includes, inter alia, the construction of green areas, a Swimming Pool, and a

Services Block.


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The project layout is illustrated in Fig. 2.4 (A1 size), and APPENDIX 1 provides

illustrative examples of the architecture and various apartment types.

The overall architectural design philosophy is described in section 2.3.3 hereunder.

2.3.2 Other components

Other components that are proposed to be constructed, include

a. Accesses

b. A parking area for ninety (90) vehicles

c. A RBC sewerage treatment plant

d. Utilities networks (water supply, wastewater, power supply,

telecommunications)

e. A leaching field of 150m2 extent

f. Two wastewater lifting stations

2.3.3 Architectural Brief

(a) Design Philosophy

In view of the rural location of this site, medium-rise apartment blocks (4-floor

maximum height), are proposed with a view to maximizing the development density

in keeping with plot coverage and height acceptable within “coastal zone E” as

prescribed in the PPG.

(b) Planning Approach

Considerations given to the planning design are as follows:

Only one access point into the site from Chemin Vingt Pieds on the eastern

boundary.

Provisions of around 50% of the parking spaces over a strip of some 17m

wide, parallel to Chemin Vingt Pieds and a small green buffer around the Kali

Mata Mandir within that strip.

A driveway, 6m wide (with 1.5m pavement on both sides) leading to the

western and eastern parts of the site to parking spaces as near as possible to

apartment blocks.

Provision for at least a future footpath along the 12 French-Foot Road (when it

is opened) on the western boundary

(c) Site Planning Layout

The layout is based on the concept of the proximity of parking lots to the apartment

blocks as far as possible and makes provision for a formal children‟s playground as

well as a swimming pool and Barbecue spaces which can be an attractive

component to buyers of the proposed apartments.

In this concept, parking lots are more evenly distributed, are closer to the blocks,

and hence would more favourably be accepted by Mauritians.


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Another advantage from a practical standpoint is that the parking areas and their

accesses are more likely to be constantly and properly maintained by a Syndic than

a large parking area tucked away from the apartment blocks and which tends to be

neglected.

The same provisions are made to this layout including a children‟s playspace with

appropriate footpath network.

Provisions have also been made for the footpath network linking the blocks with a

view to protecting the grassed areas of the park.

(d) The Architectural Component

The Housing complex will consist of 4 blocks of both 2 Bedroom (type 01 & 02)

and 3 bedroom units with a consolidated parking for its inhabitants and visitors. In

total 36 units 3 Bedrooms, 12 (Type 01) and 18 (Type 02) units 2 Bedrooms.

Block A

Block A consists of a 18 three bedroom units and 6 two bedroom units Type 01

found on the West part of the site on G+3 floors.

Block B

Block B consists of a 12 three bedroom units and 4 two bedroom units Type 01

found on the North part of the site on G+2 floors.

Block C

Block C consists of a 6 three bedroom units and 2 two bedroom units Type 01 found

on the East part of the site on G+3 floors.

Block D

Block D consists of 18 two bedroom units Type 02 found on the South part of the

site on G+3 floors.

The three bedroom unit measuring 113 sqm of area is designed, keeping in mind the

modern standard of living.

The two bedroom unit measures 91 sqm.

(e) Landscaping

The landscaping will be done around the existing trees, retaining all of them. The

central portion will be dedicated to the swimming pool and BBQ areas and kiosks.

Care has been taken to balance the private and public areas throughout the site

keeping in mind a high quality of living within the site.


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It is to be noted that only 19 % of the site is being used for Built-up area, the rest for

circulation and landscaping.

2.3.4 Services

Power Supply

The estimated diversified load for the whole complex is 450kVA. A distribution

transformer rated 600kVA (supplied & installed by CEB) shall be located inside the

Services Block building. The transformer shall cater for all blocks including the

complex requirements such as kiosks, swimming pool, external lighting.

Electrical Installations

o Concealed conduit & wiring for Ceiling/Wall light points complete with

E27 lamp holder and 9W energy saving lamps) – Light fittings to be

supplied and installed by client.

o Light fittings for terrace and balcony in each apartment is included

o Recessed and flushed type light switches and socket in all rooms

o Standby generator for all common services ( water pump, external,

corridor and staircase lighting

o All external parking area and pathways are lit with bollards

o Provision of power and sockets for all kitchen equipments ( cooker unit,

microwave, induction hood and dishwasher )

o Power consumption for the residential complex shall be approx 450

KVA.

Air Conditioning Installations

o Provision of power for Air conditioning unit (dipole switch)

o Client to install their own AC units

Telephone Installations

o Two telephone points per apartment (living room and main bedroom).

Concealed wiring for same is already done with RJ11 outlets.

Television Installations

o Two TV points (master bedroom and living room) linked to common

central antennas (terrestrial & dish type). Subscription to satellite

channel to be made by client / owner.


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Standby Generator

In the event of CEB power supply interruption , a stand-by generator will be

required. It will have the following specifications:

Power rating: 50 KVA

Duty: Standby Mode

Normal Voltage: 220 V

Engine type: Electronically controlled heavy duty diesel engine,

water cooled and turbo charged

Rated speed: 1500 rpm

Ambient temperature : up to 52 deg

Fuel: Diesel

Fuel consumption: 20 L /hr

Storage capacity: base tank within generator set cater for 180 L and bulk

tank is 1500 L

Automatic mains failure control. Generator is fitted with automatic change

over panel.

Programmable automatic start / stop

Automatic start-time: 5 seconds

Noise level: 78 dBA at 1 m ( at 100% load)

The capacity of the diesel tank that would be required for interruption of CEB

supply over a period of say five days (cyclonic periods) is 1500+180 L adequate for

an autonomy of 84hours.

The diesel storage tank within / close to the Services Block will be in accordance

with API or the Diesel Supplier own specifications and will be erected under the

responsibility of one of the local petroleum companies, who will also be responsible

for the delivery of the diesel. The tank shall be erected on a reinforced concrete

platform, surrounded by a concrete bund wall of a containment capacity of 10%

above the actual volume of the diesel tank so as to efficiently buffer all eventual

leaks.

Water Supply

Cold Water Distribution

The potable water requirement for the proposed development is estimated at some

86 m3/day as indicated hereunder.

No m3/day

Housing Units 66 66

Swimming Pools 10

TOTAL REQUIREMENT 76

The water distribution shall be a pressurized system with a booster pump set, fed

from a central ground water tank, total capacity 130 m3, adequate for two-day


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autonomy in case of interruption of water supply from the CWA, installed within

the perimeter of a service block building.

A CWA meter shall be installed to monitor the water consumption. Pressurized

water to apartments shall be distributed horizontally around the complex via uPVC

pressure pipes.

Hot Water System

Hot water system to each apartment shall be produced by individual instantaneous

gas water heaters, capacity 5-10 kW

In addition, hot-water pipeworks to solar heaters shall be provided. Provision will

be made on top of roof for client / owner to supply and fix solar water heaters.

Wastewater Evacuation & Treatment

Each apartment‟s sewage and wastewater shall connect to main pipes (laid

underground) and directed to a RBC Treatment Plant. Common grease traps shall be

provided for kitchen wastewater.

The treated effluent from the STP will be used for the irrigation of lawns and other

landscaping features. Any excess effluent from the STP (in particular when

irrigation is not required) will be conveyed to a nearby leaching field of 150m2

surface area.

The STP will be operated and maintained by a Specialist Contractor to be employed

by the Syndic.

Stormwater Disposal

Stormwater from buildings and paved areas will be channeled to several soakaways

distributed within the project site.

Disposal of Domestic Solid Wastes

Domestic solid wastes will be kept in individual bins that will be emptied into a

central collector bin located close to the Service Unit. From the central collector, the

wastes will be collected by the District Council.

Fire Fighting and Safety

Provision shall be made for 5 m³ of water storage for fire hose reels, which shall be

installed at each floor lobby of each block. Fire-Fighting pumps shall be located in

pump room and high density polyethylene pipes shall be used as distribution piping

to hose reels.

The following provisions will be made to ensure safety:

o Smoke detection and alarm in all common & technical areas(

transformer room, pump room, etc)


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o Manual Call Points and sounders at each floor landing

o Portable Fire extinguishers at each floor landing

o Fire Hose Reels at each floor landing

o Emergency lighting along all escape routes

Swimming Pool Installation

A swimming pool circulation system consisting of a recirculation pumps,

chlorination system, filters and ballast tank. Backwash water from the pool shall be

evacuated to an absorption pit.

2.3.5 Description of Works to be undertaken

Works to be undertaken will comprise of (a) excavation for roads, parking areas, residential

blocks, sewerage treatment plant, service unit, and utilities, (b) construction of the various

items mentioned above.

Earthworks

1. Construction of roads, accesses, and parking areas

The total length of 6m wide roads amounts to 275 m, and the parking areas are of

610 m2 extent. Footpaths for access to the various residential blocks and swimming

pool compute to a total length of 585m.

Construction of the roads and parking areas will require the removal of top soil, and

subsequent soil / gravels down to some 150mm below the thickness of the top soil.

Volume of top soil is estimated at 350 cubic metres.

Volume of excavated materials below top soil layer is estimated at 450 cubic

metres.

Fig. 2.5 provides typical sections for paved accesses (roads) and roadside drains.

2. Construction of utilities networks (power supply, telecommunications, water

supply network, sewer network

It is envisaged to have one common trench for power supply, telecommunications

and water supply, and one separate trench for sewers. The trench for power supply,

telecommunications and water supply will be about 1.5m wide and with a mean

depth of 0.8m. That for the sewers will be 0.6m wide by 1.5m deep.

Total length of trench for power supply, telecommunications and water supply is

estimated at about 390 metres – excluding trenches for house connections. The

volume of earthworks is estimated at 470 cubic metres.

Total length of trench for sewers is estimated at about 420 metres – excluding

trenches for house connections. The volume of earthworks is estimated at 380

cubic metres.


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An estimated 60% of the total volume of excavated materials might be used for

backfilling of trenches.

Fig.2.6 illustrates (a) the alignments of the various utilities networks, (b) the

location of the STP, of the lifting stations and of the leaching field, and (c) sections

of the various trenches.

APPENDIX A provides the Design Parameters for the STP

Fig.2.7 illustrates the locations of the various soakaways for stormwater runoff.

3. Excavation for foundations of building structures

Construction of foundations for structures will require excavation works. However,

excluding top soil, all excavated materials will be used for backfilling.

4. External Boundary Walls

Construction of external boundary walls of a total estimated length of 500 metres,

will require excavation of trenches for foundations. Estimated volume of excavated

materials is 150 cubic metres, out of which some 60% will be used for backfilling.

Landscaping Works

It is envisaged to use all surplus excavated materials for landscaping.

2.3.6 Construction Materials

It is expected that, wherever possible, local materials will be utilised in the construction of

the proposed project. Materials to be used will, inter alia, include cement, coarse and fine

aggregates, steel, timber, glass.

For the sewer network, uPVC pipes of diameter ranging from 110 mm to 200/250 mm and

HDPE pipes of diameter 225mm will be used.

For water supply, HDPE pipes of diameter 20mm for house connections, 63mm-160mm for

reticulation (including mains from CWA pipeline) will be used.

Road works will require hardcore 0 – 100mm, crusher run 0 – 35mm, aggregates &

bitumen, concrete for footpaths / sidewalks. Drains will require concrete and coarse

aggregates. The superstructure for drains will be in concrete, overlying a soakaway filled

with rocks overtopped with crusher run of 150mm.

Backfilling of trenches for utilities will require 4/6mm coarse aggregates, and suitable

materials from the excavated materials.


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2.3.7 Construction Process

Construction Equipment / Plant

Equipment used for the construction of the project would usually involve the

following:

Tractor d8 with dozer and ripper

Power grader min. 120HP

Tandem roller 6 -8 Ton

Pneumatic roller 6 - 8 Ton

Self-propelled vibrating roller 3 – 5 Ton

Concrete mixer with wgt batcher

Poker vibrator

Bitumen sprayer 4500 litres

Asphalt paver

Compressor

Bobcat

Lorry with service platform

Water distributor (bowser)

5hp pump and motor

1 ton pickup truck

7 ton tipper truck

11 ton tripper truck

Welding equipment

Generator

Workforce

The estimated number of people to be employed under the Project is not known at this point

in time. At the tendering stage however, Contractors will be requested to indicate their

manpower requirement to be able to complete the works within the prescribed time

schedule..


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National Housing Development Corporation LUXCONSULT (Mtius) Ltd

Fig.2.2 – Google Satellite Image of proposed site


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Fig.2.3 – Aerial view of site after construction


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Fig.2.4 – Project Layout / Site Plan (An A1 size drawing is also provided in the following pocket)


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Fig.2.5 – Typical Sections for Accesses and Drains


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Fig.2.6 – Utilities Networks


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2 project description -...

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