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Metro Colombo Urban Development Project

Environmental Screening Report

Infrastructure improvements for Sri Jayawardena Pura Kotte Municipal

Council

Improvements to the Municipal Council Roads - Package I

Submitted by

in association with

DEMOCRATIC SOCIALIST REPUBLIC OF SRI LANKA

SOUTHEAST ASIA TECHNOLOGY CO. LTD

EML CONSULTANTS (PVT) LTD

April 2013

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Table of contents

1. Project Identification ................................................................................................................ 3

2. Project Location........................................................................................................................ 3

3. Project Justification .................................................................................................................. 6

4. Project Description ................................................................................................................... 7

5. Description of the existing environment.................................................................................. 8

5.1 Physical features – Ecosystem components ............................................................................ 8

5.2 Ecological features – Eco-system components ...................................................................... 12

6. Public Consultation ................................................................................................................ 14

7. Environmental Effects and Mitigation Measures ................................................................... 15

8. Conclusion and Screening Decision ........................................................................................ 30

9. Screening Decision Recommendation .................................................................................... 33

10. Details of Persons Responsible for the Environmental Screening ......................................... 34


Environmental Screening Report

1. Project Identification

Project title

Improvement of Local Authority Roads in Sri Jayawardenapura Kotte Municipal Council (SJKMC) Area – Package 1

Project Proponent

Sri Jayawardenapura Kotte Municipal Council

2. Project Location

Location

(relative to

the nearest

town,

highway)

The proposed road improvement activities are spread in entire Local Authority Area of SJKMC

Definition of Project Area

(The

geographical

There are 48 roads proposed for the rehabilitation in SJKMC. The selected roads are clustered as two packages for easy implementation. This report is for the Package I activities and a separate screening report has been prepared for package 2. The list of selected roads for Package I is given below.

extent of the

project &

areas affected

during

construction)

Road Name Length

Package1

1 Jampugasmulla Road 383

2 Walter Gunasekara 488

3 Nugegoda Pagoda Road, 1st Cross Street 617

4 Nugegoda Road, 1st Lane 326

5 D.M.Kolambage mawatha 279

6 Sarasavi Udyanaya Road 406

7 Somathalagala Mawatha 918

8 Nagavihara Road 280

9 Pelawatta Road 397

10 Meliban Arama Road 274

11 Nawala 5th Lane 206

12 Senanayake Mawatha, Nawala 227

13 Pagoda Shramadhana Mawatha 277

14 Rupasinghe Mawatha 249

15 Nawala Jesmine Place 420

16 Medawelikada Road 391

17 Nanayakkara Mawatha 528

18 School Road, Nawala 290

19 School Lane, Nawala 251

20 Araliya Mawatha 181

21 Thilaka Gardens (Drain) 50

22 Rajagiriya Garden Scheme road 822

23 Rajagiriya Park Road 448

24 Vimalawatte Road 542

The location of roads are given in the Annex I

Adjacent land and features

The land use pattern of the SJKMC is given in the following Table 1 and Figure 1. Nearly 54% are residential and 13% are marshy lands.

Table 1: Land use pattern of the SJKMC

Figure 1: Land used pattern of the SJKMC area

3. . Project Justification

Need for the project

(What problem is the project going to solve)

The roads selected for rehabilitation in the SJKMC are mainly link roads for the other main roads which are connecting National High Ways and Provincial roads. These roads are not properly maintained for a long period leading to a dilapidated condition. Due to this, the road users are facing difficulties during transportation. Therefore, implementation of

this project will solve the problems associated with the damaged roads. Please see existing conditions of roads and road side drains in Annex II.

Purpose of the project

(what is going to be achieved by carrying out the project)

The purpose of the project is to provide safe and convenient roads and clean and adequate road side drains to mitigate local flooding situation to the road users and the residence in the area.

Alternatives considered

(different ways to meet the project need and achieve the project purpose)

No any other alternative is considered for the project as it is envisaged that there are no any other technically feasible and economically viable engineering interventions that could be accommodated in place of the proposed option.

4. . Project Description

Proposed start date The target date to commence the construction activities is in early May 2013.

Proposed completion date It will be completed within 6 months from the date of commencement.

Estimated total cost The estimated cost will be around Rs. 350 million

Present land ownership All proposed project areas belong to the SJKMC

Description of the project

(with supporting material such as maps, drawings etc attached as required)

The proposed activities are:

1. Road Construction (Typical Road sections are given in Annex 3) Edge Construction - Clearing and Grabbing - Excavation and filling - ABC overlying - Asphalt overlying

2. Construction and improvement to the existing road drains - (detail drawings of the drains are given in the

Annex 3) - Excavation - Blending concrete - Base concrete - R/F wall concrete - Back filling

3. Walkway Construction - Clearing and compaction - Kerb Laying - Motor filling - Interlock Paving

4. Road marking and street furniture 5. Common Activities

- Transport of construction material, Asphalt mix, spoilages dredged materials etc.

- Stockpiling of material

- Landscaping and beautification

Project Management Team

Agency – EML Consultants (Pvt) Ltd.

Design and Construction Supervision Consultants

Nature of consultation and input received

Review of the proposals submitted by the SJKMC and provided technical input in preparation of detail designs and bid documents.

5. . Description of the existing environment

5.1 Physical features – Ecosystem components

Topography and terrain

Extensive faulting and erosion over time have produced a wide range of topographic features of Sri Lanka. In general the topography of Sri Lanka can be divided into three zones. The three zones distinguishable by elevation are: the Central Highlands, the plains, and the coastal belt. http://en.wikipedia.org/wiki/Geography_of_Sri_Lanka. This coastal peneplain rises to a maximum elevation of < 500 feet from sea coast. The terrain of the proposed project area in SJKMC is almost flat and it is in between 3 to 100 feet MSL. Source: National Atlas -2007 Figure 2: Geological map of Colombo District

Soil (type and

quality)

Soil

There are three types of soil that were identified in the study area which are:

i. Red-Yellow Podzolic soils with soft or hard Laterite in undulating and rolling terrain

ii. Bog and half-bog soils in flat terrain and

http://en.wikipedia.org/wiki/Geography_of_Sri_Lanka

iii. Alluvial soils of variable texture and drainage in flat terrain

The soil map of the area is given in the Figure 3

Source: National Atlas 2007

Figure 3 Soil map of the area

A sample soil profile of the area project is given in the Figure 4.

Figure 4: A sample soil profile of the Walter Gunasekara Mawatha

Surface water (sources, distance from the site, local uses and quality)

The project is covering the entire SJKMC area but no surface water body is directly connected to the project activates. The hydrology of the SJKM area is integrated with the Greater Colombo Water Basin (GCWB) which comprises some 85 km2 of land around Colombo. This GCWB basin is bordered by the Kelani Ganga in the North, the Weras Ganga in the South-East and the sea (Indian Ocean) in the West. The layout of the basin including the Parliament Lake and surrounding storage areas is shown in Figure 5. The basin slopes from south-east to north-west, with elevations of 10-20 m+MSL in the upper reaches to about 1 m+MSL downstream.

Figure 5: The layout of the Greater Colombo Water Basin including the Parliament Lake and surrounding storage areas

Diyawanna Oya/parliament Lake is the major water body in the SJKMC area and falls under the Sothern canal system discharges to the sea at the Wellawatte outfall. It follows through the Kolonnawa South Ela, Kotte Ela, Kirulapone Canal and Wellawatte canal. The Diyawanna Oya is mainly used for the recreational activities.

The quality of the water in most of the canals are polluted, except Diyawanna Oya in which the water quality is less polluted when compare to the other canals in the area.

Ground water (sources, distance from the site, local uses and quality)

The ground water table in the area varies from one meter to 10 meter depending on the topography of the land. The wells located near the canals area polluted and could not be used for the drinking purposes. But in the high land, the water quality is comparably good and used for the domestic purposes. Generally, pipe borne water is available for the domestic purposes in the area.

Flooding Flooding is common in the low lying areas near Diiyawanna Oya, and other canal system. But it has been reduced by the MCUDP’s rehabilitation projects. Walter Gunasekara Mawatha and the Thilaka Garden are generally flooding area due to the lack of proper drainage facilities. No major problem in the selected roads.

Air quality (any pollution issues)

Air quality of the proposed sub project area is mainly influenced by the vehicle movement in the area. The major air pollutants emitted due to the vehicle movements are: Dust, particulate matters, smoke including Co, Co2, Nox, SOx , HC etc. The level of ambient air quality could increase considerably during the peak hours in any urban roads due to traffic congestion. The construction activities will contribute a certain amount of air pollutants to the surrounding environment. The major air pollutants will be the dust from the road resurfacing, handling, storage and transportation of materials and spoilages.

Noise level and vibration (Any anticipated issues)

Major source for the noise and vibration is the vehicle movement. As this area falls under the medium noise zone of the National Environmental Noise Control regulation, the noise levels during the day time should be 63 dB(A) and 55 dB(A) during the night time. However, most of the times these noise levels may exceed along the road sides due to vehicle movements. The construction vehicle movement may increases the noise levels in the project sites causing nuisance to the people living near the road sides.

5.2 Ecological features – Eco-system components

Vegetation

(trees, ground cover, aquatic vegetation)

No trees are to be cut down during the construction stage; no impacts could be expected on vegetation. Therefore, no detail study has been conducted.

Presence of wetlands

There are several canals and small wetlands in the area. Most of them are highly polluted and some are ecologically important wet lands. But no direct impacts to the canals or wetlands were observed.

Fish and fish habitats

Except the Diyawanna Oya, the other existing water bodies, particularly small canals, in the area are highly polluted due to poor maintenance and discharge of domestic and industrial wastes into the canals. Therefore, there are no ecologically or economically important fish in the canals. In the mean time there is no direct impact to the Diyawanna Oya due to the project activities.

Birds (waterfowl, migratory birds, others)

No special study has been conducted as there are no impacts to the birds in the area.

Presence of special habitat areas (special designations

There are several sensitive areas in the SJKMC area. In 1984, the area around the Diyawanna Oya has been gazetted as a Wild Life Conservation area by the Department of Wild Life Conservation

and identified sensitive zones)

considering its bird habitation. The area surrounding the Diayawanna Oya falls within a flood protection area (Colombo Flood Detention Area) declared under the Sri Lanka Land Reclamation and Development Corporation Act 15 of 1968 as amended by Act No 52 of 1982.

None of the roads selected for the rehabilitation will be directly connected to these areas, hence no impacts could be observed from the project activities.

Other features

Residential/Sensitive Areas

(Eg, Hospitals, Schools)

There are schools, Buddhist temples, playgrounds, churches located in some roads. However, these roads are located in highly residential area. The details of such sensitive areas are:

i. Temples Nagavihara Road Maliban Arama Road

ii. Schools Pelawatte Road Rajagiriya Garden Scheme Road Nawala School Road

Traditional economic and cultural activities

There are no major traditional business activities in the area. The cultural activities are highly related to the religious events based on the location where, the religious places are located particularly, Church, Buddhist temple, etc.,

Archeological resources

(recorded or potential to exist)

There are no archeological resources/sites directly connected to this project.

6. Public Consultation

Public consulted Consultation method

Date Details/Issues raised

People residing in the area

One to one interview

01.06.2012

13.10.2012

1. The surface areas of the roads are damaged and there are several pot holes in the roads as the roads are not properly maintained for a long period. Dust emitted from such roads due to vehicle movements, are causing nuisance to the pedestrians and the residences located on either sides of the roads.

2. No proper traffic control and road signs. The uncontrolled driving is a threat to the pedestrians and the residence in the area.

3. Even though, the flood situation in the selected roads are of less prevalence, improper maintenance of road drains is causing local flooding during the rainy season.

4. Irregular collection of waste by the Local

Authority and of the disposal of solid waste by the people in the area is also a major cause of the blockage that occurs in drains.

5. The general opinion is that the

rehabilitation of the roads is very necessary, as these roads are not properly reconstructed for a long period of time but the local authority is doing temporary maintenance.

7. Environmental Effects and Mitigation Measures

7a. Screening for Potential Environmental Impacts

Screening question Yes No Significance of the effect

(Low, moderate, high)

Remarks

1 Will construction and operation of the Project involve actions which will cause physical changes in the locality (topography, land use, changes in water bodies, etc)

No This is an existing road improvement project. Therefore, no physical changes will occur negatively. Positive physical changes will be expected.

2 Will the Project involve use, storage, transport, handling or production of substances or materials which could be harmful to human health or the environment or raise concerns about actual or perceived risks to human health?

Yes Low

The construction materials and spoilages and construction debris handling, transportation and temporary storage may emit dust to the environment due to the wind may causes temporary respiratory uncomfortable for the people including the labors who are susceptible to the dust

3 Will the Project produce solid wastes during construction or operation?

Yes Low

Spoilages and construction debris produced during demolition of existing structures, Pavements and excavation of trenches.

De-silting wastes (man holes, gullies, etc.) and during operation, street sweeping wastes, solid wastes collected in garbage bins would be expected

4 Will the Project release pollutants or any hazardous, toxic or noxious substances to air?

Yes Low

There will be bituminous material used during overlay and re-surfacing of roads, patching, shoulder repairs, etc.

Paints and solvents used for road marking can emit toxic and noxious air-bone substances



Remarks

5 Will the Project cause noise and vibration or release of light, heat energy or electromagnetic radiation?

Yes Moderate

The construction activities mainly from the operation of machineries will emit considerable amount of noise and the vibrators used in the compacting activity will generate considerable vibration, which may causes nuisance to the people living along the road sides. This is a short term impact.

No activities involved in the project which release light, heat, energy or electromagnetic radiation

6 Will the Project lead to risks of contamination of land or water from releases of pollutants onto the ground or into surface waters, groundwater or coastal waters?

Yes Low -

Surface treatment, digging of trenches, wash out from material piles during the rainy season and during the dredging process may increase the turbidity and suspended solids in the discharge canals. Further, loosened soil materials in the shoulders may wash out during the rainy season and may cause increase Turbidity, Total Suspended Solids in road side drains and nearby canals. This is a short term impact. When considering the overall pollution during the rainy season, this will be an insignificant impact.

The contamination disposal site by the disposal of dredged materials may not be a significant as the selected site is already used for the mass dumping of Municipal solid waste, no impacts could be expected.

However proper mitigation measures will be discussed in the Environmental Management Plan to reduce any likely negative impacts.

7 Will the project cause localized flooding and poor drainage during construction

Yes Low

Some areas of the project sites are located in low lying area and frequent flood in the area is recorded. However, the construction will minimize the flooding situation in the area. Stockpiling of



Remarks

Is the project area located in a flooding location? construction debris and other materials may block existing drainage flow paths causing flow stagnation and localized flooding effects. All these are temporary in nature.

8 Will there be any risks and vulnerabilities to public safety due to physical hazards during construction or operation of the Project?

Yes Low - road construction activities

Inconveniences to the pedestrians and road users due to uneven road surfaces. This is a short term impact and can be best managed with prior notice and good safety precautions on-site.

9 Are there any transport routes on or around the location which are susceptible to congestion or which cause environmental problems, which could be affected by the project?

Yes Moderate

Some of the roads selected for the rehabilitation are major link roads with high traffic. The construction work may create congestion and traffic in the main roads. Proper traffic management plan in such roads are needed.

10 Are there any routes or facilities on or around the location which are used by the public for access to recreation or other facilities, which could be affected by the project?

Yes Low

No direct use of roads for recreational facilities as the roads selected are in residential areas.

11 Are there any areas or features of high landscape or scenic value on or around the location which could be affected by the project?

No No such location in the immediate vicinity of the selected roads.

12 Are there any other areas on or around the location which are important or sensitive for reasons of their ecology e.g. wetlands, watercourses or other water bodies, the coastal zone, mountains, forests which could be affected by the project?

No The sensitive area like, bird sanctuary, wetland is not located near the project. .

13 Are there any areas on or around the location which are used by protected, important or sensitive species of fauna or flora e.g. for breeding, nesting, foraging,

No



Remarks

resting, migration, which could be affected by the project?

14 Is the project located in a previously undeveloped area where there will be loss of green-field land

No

15 Will the project cause the removal of trees in the locality?

No Improvements are for an existing road network without any land acquisition

16 Are there any areas or features of historic or cultural importance on or around the location which could be affected by the project?

No

17 Are there existing land uses on or around the location e.g. homes, gardens, other private property, industry, commerce, recreation, public open space, community facilities, agriculture, forestry, tourism, mining or quarrying which could be affected by the project?

Yes Moderate

The selected roads are located in highly residential area and there are some schools, religious places, and commercial activities are also situated in the area. The construction activities particularly, the noise and dust may create nuisance to the recipient in the area. This is a short term impacts and could be minimized by adopting the proper mitigatory measures.

18 Are there any areas on or around the location which are densely populated or built-up, which could be affected by the project?

Yes Moderate

The roads are located in highly residential areas and the construction activities may cause nuisance due to excessive noise, vibration and dust. These are temporary and localized impacts.

19 Are there any areas on or around the location which are occupied by sensitive land uses e.g. hospitals, schools, places of worship, community facilities, which could be affected by the project

Yes Moderate

There are schools, Buddhist Temple and churches are located in some roads. The dust, noise and vibration generated from the construction activities may cause nuisance during the school hours, prayer and services time and the festival and special functions. Apart from the above, the traffic congestion will be a major impact to the road users. However, this is a short term impacts. Proper EMP and the traffic management plan will mitigate this issue.



Remarks

20 Are there any areas on or around the location which contain important, high quality or scarce resources e.g. groundwater, surface waters, forestry, agriculture, fisheries, tourism, minerals, which could be affected by the project?

No

21 Are there any areas on or around the location which are already subject to pollution or environmental damage e.g. where existing legal environmental standards are exceeded, which could be affected by the project?

No

7b. Environmental Management Plan

Serial No Environmental

Concern/Issue

Activity Mitigation Measure

01 Drainage Design and

implementation of

roadside drains and lead

away canals

For culverts and leader ways appropriate designs should be

considered to allow smooth inflow and outflow of drainage water.

For silt traps and catch pits, where required appropriate designs

must be ensured to trap silt and drain out storm water without

causing any blockages.

02. Disturbance to existing

vegetation

Site Clearance and land

development

During site clearance and development, attention should be paid to

make minimum disturbance to soil cover, existing plants, trees, etc.

No tree should be removed without approval of the Engineer

Minimal use of machinery is recommended for clearing and tree

cutting purposes (if any).

03. Drainage Management

Blockage of

drainage paths and

drains

Stockpiling of material

Stockpiling of waste

Drainage re-construction

Contractor’s activities shall not lead to flooding conditions as a

result of blocked drainage paths and drains.

Contactor shall take all measures necessary or as directed by the

Engineer to keep all drainage paths and drains clear of blockage at

all times

Drainage diversions should be provided when existing drainage

system and flow paths are temporarily blocked due to construction

activities

Use of erosion and sedimentation control measures is

recommended, where necessary

Existing gullies and sill levels of side drains should be modified to

suit new formations and elevated finishing levels of the roads.

Activities should be schedules to avoid monsoon periods and

durations with heavy showers to avoid inconveniences due to high

flow generation. During such periods of disruption pumping and

dewatering facilities should be provided where necessary

04 Disposal of debris and spoil Clearing and grabbing

Residual construction

material

Excavated earth

Waste from labour camps

Empty containers and

packaging material

All debris and residual spoil material including any left earth shall

be disposed of in locations approved by the Engineer (who may be

a consultant hired to carry out supervision and represents the

SJKMC)

When disposing debris, the contractor must ensure that waterways

and drainage paths will not get blocked; the material will not get

washed away by runoff and will not be a nuisance to the public.

The contractor must also ensure that excavated earth material and

construction debris are not stockpiled at different locations along

the constructed roadway but swiftly disposed to recommended

sites as instructed by the engineer.

With the approval of the Engineer, the contractor may be able to

dispose the construction debris and earth as fill material to a

recommended site.

When transporting spoil and debris vehicles should be covered with

tarpaulin.

05 Protection of ground cover

and vegetation

Site clearing

Shoulder repair

Drain improvement

Construction vehicles, machinery and equipment shall be used and

stationed only in areas of work and any other area approved by the

Engineer.

Entry and exit points for construction vehicles should be defined

and instructed by the Engineer

No activity shall lead to the destruction of ground cover and

vegetation unnecessarily and the contractor shall instruct its staff

adequately about this.

06 Burrowing of earth Filling If the contractor requires earth material for construction work, he

has to ensure that he will obtain the necessary material from

licensed sources

If he wishes to operate his own burrow sites, he shall do so with all

necessary approvals and in adherence with guidelines issued by the

CEA or the local authority for locating, operating and transporting

burrow material.

In such a case, the contractor will make sure that the site is fully

rehabilitated after burrowing is completed.

07 Other site management

aspects

Silt traps should be constructed, where necessary, to avoid wash

out of particles to main drains and waterways

Barricades such as humps should be erected around excavated

areas with proper sign boards especially during heavy rain when

work has to be stopped. These areas will need a proper temporary

earth drain system with adequate sedimentation control measures

All sedimentation and pollution control works and maintenance

thereof will be deemed as incidental to construction work.

The contractor has to provide the Engineer a list of potentially

harmful or hazardous chemicals/products before commencing

operations and ensure he keeps the Engineer informed as to how

he has disposed of these chemicals/products.

Locations for material storage should be identified prior to

commencing work and approved by the Engineer. As the proposed

roads and the surrounding areas are built on either side, storage

space will be limited.

All cement, bitumen (barrels), oil and other chemicals such as paint

should be stored and handled on an impervious surface above

ground level.

The storage location for these products should be enclosed and not

exposed to rain and storm water run off

A temporary ridge should be constructed with suitable material

around such places to avoid storm water getting in.

The contractor shall avoid overloaded trucks to bring material to

construction sites. During transport the material should be covered

with Tarpaulin

08 Contamination by fuel and

lubricants

Maintaining of vehicles and

equipment

Vehicle/machinery and equipment servicing and maintenance work

shall be carried out only in designated locations.

If the contractor intends to set up his own vehicle servicing yard, he

should obtain an EPL from the CEA

Waste oil, petroleum products and untreated waste water shall not

be discharged to the ground and shall be discharged in accordance

to CEA guidelines.

If there is a spillage of petroleum products from storage tanks and

containers, immediate corrective measures should be taken to

arrest pollution

Once work is completed, these service yards shall be restored back

to its initial status and this will be considered as incidental to work.

09 Quarry operations Base layer Utilize existing quarry sites which are approved by the GSMB and

operated with a valid EPL. The selected quarry sites should be

informed to the Engineer.

If the contractor wishes to open a new quarry supply metal to the

project, he should do so with necessary approvals from the GSMB,

CEA or Local Authority. In this case, the maintenance of access

roads in the event of damage will be the responsibility of the

contractor.

It is recommended not to seek material from quarries that have

ongoing disputes with communities.

10 Air pollution

Dust generation

Site clearing and grabbing

Excavation and filling

The contractor shall effectively manage the dust generating

activities such as the ones listed. The contractor shall employ a

watering trucks/water sprinklers for dust suppression on all

Emissions from

vehicles and

machineries

Emissions from

plants such as Hot

mix, Batching and

Crusher plants (if

any)

Odor and offensive

smells

ABC overlaying

Asphalt overlaying

Construction and

improvement of drains

Walkway construction

Transporting, loading and

unloading of construction

material, asphalt mix,

spoilage


areas/activities where required

When maintaining material stockpiles, guidelines given in section

03 should be considered.(Drainage Management)

All vehicles delivering materials (construction/debris) shall be

covered by tarpaulin to avoid spillage and dust emission.

Where necessary dust barriers should be erected to protect the

residences.

The contractor shall enforce vehicle speed limits to minimize

generation of dust and all machinery, plants (batching plant) and

equipment shall be handled so as to minimize generation of dust

The contractor shall carry out site clearing, either manually or

mechanically, if needed and directed by the Engineer.

All vehicles, equipment and machineries used for construction shall

be regularly maintained in order to ensure that emission levels

comply with the relevant emission standards stipulated under the

National Environmental Act. They shall be well maintained and

regularly services and have obtained the certificate for Vehicular

Emission Test (VET).

If the contractor operates Hot mix/Batching/Crusher plants or if

outsourced, the plant operations shall be undertaken in accordance

with CEA guidelines/conditions and operated with an

Environmental Protection License in order to minimize air pollution.

Contractor shall take all precautions to store any volatile

chemical/paints material used for construction activities in properly

closed containers with good ventilation in order to prevent

odor/offensive smell

11 Noise pollution and

vibration

Maintenance of vehicles, equipment and machinery (such as

compactors and vibrators) shall be regular and proper in order to

keep noise from these at a minimum

They shall be fitted with noise reduction devices as per the

manufacturer’s instructions (exhaust silencers)

All equipment, vehicles and machinery shall be operated to meet

noise and vibration control regulations stipulated by the CEA in

1996 (Gazette Extra Ordinary, No. 924/12)

Working time should be restricted for noise generation activities as

appropriate in consultation with the Engineer.

If the contractor operates Hot mix/Batching/Crusher plants or if

outsourced, the plant operations shall be undertaken in accordance

with CEA guidelines/conditions and operated with an

Environmental Protection License in order to minimize noise

pollution. Further, noisy construction work such as crushing,

concrete mixing and batching should be carried out at least 150m

away from closest habitation.

Workers in vicinity of strong noise shall be given with protective

gear

Vibratory rollers for compaction should be operated with great

care.

Contractor shall take appropriate action to ensure that construction

works do not result in damage adjacent properties due to vibration

12 Impact on Flora and Fauna All works shall be carried out in a manner that the destruction to

the Flora/Fauna and their habitats is minimized.

Trees and vegetation will be removed only if it impinges directly on

the permanent works, as per the design and with approval of the

Engineer.

Care must be taken to minimize the possibility of introducing

invasive plants from fill material.

13 Health and safety of

Workers (at the site and

work camps)

Contractor shall comply with the provisions in Health and Safety

regulations under the Factory ordinance with regards to provisions

of health and safety measures and amenities at work places.

If the contractor is operating labor camps, he shall provide and

maintain necessary (temporary) living accommodation and ancillary

facilities for labor (as per the requirement) according to standards

and scale approved by the Engineer

At the labor camp sufficient number of bathing facilities, latrines

and urinals (with properly designed sewage and wastewater

disposal) shall be provided for men and women separately. These

latrines shall be cleaned daily and kept in a good sanitary condition.

The labor camps shall be provided with water supply

Garbage bins shall be provided at the labor camps as well as the

work sites regularly emptied and the garbage disposed of to a

SJKMC collection point.

No paint containing lead or lead products will be used. Facemasks

shall be supplied to workers who are working in spray painting or

scraping lead paint.

14 Safety precautions of

workers and public

All reasonable precautions shall be taken by the contractor in order

to prevent any danger of the workers and the public from accidents

by providing adequate warning signs, barricades, flagmen and

lighting as appropriate

To ensure prevention of risks from electrocution all electric power

driven machines used on the construction site shall be regularly

inspected and maintained and kept away from

permanent/temporary pedestrian walkways.

The contractor shall instruct his workers in safety matters and

emphasize the use of safety gears.

The contractor shall maintain two registers in order to keep records

on complaints received with regards to environmental matters and

for recoding incident/accidents

In the contractor’s Environmental Action Plan, measures he will

adopt to ensure worker/public safety will need to be spelt out in

detail

15 Traffic Control Detail traffic control plan should be formulated and submitted for

Engineer’s approval before construction work commences. This

plan should specify temporary diversions (if any) details of

arrangements for construction under traffic and details of traffic

arrangements after cessation of work or work during night time.

The contractor shall erect and employ barricades, signs, markings,

flags, lights and flagmen according to accepted standards and as

per the requirement and also liaise with the local police on the

proposed arrangements.

The contractor shall assign a key Traffic Control personal to oversee

the traffic management and to coordinate with the traffic police. All

personnel involved with traffic management shall be provided with

the necessary communication equipment and luminous jackets for

night use etc.

16 Loss of access Provide advance information to the residents and public about the

planned construction work, restriction on access, traffic

arrangement in order to avoid inconveniences

Contractor should plan his construction work that will enable

access to the road to its users and not be totally cut off, as far as

possible.

17 Roadside landscape No invasive exotic species should be introduced and only native

trees must be used for landscaping. The contractor shall remove all

debris, piles of unwanted earth, spoil material away from the road

and dispose in an acceptable way, as mentioned previously in this

EMP,

8. Conclusion and Screening Decision

Summary of environmental effects:

Abbreviations

N/S - Effect not significant, or can be rendered insignificant with mitigation;

SP - Significant positive effect

SN - Significant negative effect)

Assuming that all mitigation measures are implemented as proposed, the following effects can be predicted

Project Activity Environmental impact

Significance of the environmental effect with mitigation in place

1.0 Road Construction NS

1.1 Edge construction

Clearing and Grabbing

Removal of top soil, dust emission, noise, spoil, dumping of spoil materials etc.,

NS

1.2 Excavation and filling Noise and dust and the excavated materials ,

Possibility of introduction of invasive plant from the filling materials

NS

1.3 ABC overlying Noise form machineries

Dust emission

Vibration

NS

1.4 Asphalt overlying Air pollution due to volatile material emanating from bituminous material.

Obstruction to vehicular movements on roads under construction and increased

traffic on alternate roads

Disturbances to day-to-day activities of residents,

NS



road-users due to traffic

diversions and restricted entry to byroads

Delays for office workers and school children in attending to their daily routines.

Closure of roads for traffic:

Inconveniences to residents (problems of access to their property) and other road users, especially commercial establishments for their delivery vehicles.

Disturbance to pedestrian movement and safety issues due to asphalting.

2.0 Construction and improvement to the existing road drains

- Excavation - Blending concrete - Base concrete - R/F wall concrete - Back filling

Noise from the concrete mixture,

Excavated spoil materials, waste water from the mixer and tools cleaning, restriction to vehicle movement.

NS

3. Walkway Construction

- Clearing and compaction - Kerb Laying - Motor filling - Slab Paving

Noise and Vibration from

Excavated spoil materials, dust emission, disturbances to the road users

NS

4. Road marking and street furniture No major impacts NS

5. Common Activities

5.1

Transport of construction material, Asphalt mix, spoilages etc.,

Emission of dust due to transport of material, Emission from the Asphalt, spillages on the transport route etc.,

NS



5.2


Emission of dust Erosion of material during rains;

Stock piling of soil, debris and

other material may block

surface drainage paths causing

localized flooding during

constructional and operational

Periods.

If not properly stored and adequately covered, fine material washout may significantly degrade groundwater and surface water

quality in canals and inland

NS

5.3 Landscaping and beautification Introduction of exotic species as part of landscaping need to be planned carefully as invasive can be introduced

Involuntarily. However, there will be no exotic invasive species used as per

current plans, hence no impact

NS

06 Traffic Control Operation of equipment, machineries and other vehicles for project activities may cause traffic congestion and would results in disturbing to the public

NS

07 Safety precautions of workers and public at the site and in work camps

Improper management of safety in the site may

cause accidents on workers and public as well

Improper management of work camps may cause adverse effects on worker’s health and surrounding environment

NS

9. Screening Decision Recommendation

Key

recommendations

All potentially adverse environmental effects can be classified as general

construction related impacts and are mitigatable with known technology.

Therefore, stand alone Environmental Assessment not required, an

Environmental Management Plan would be sufficed.

In general, necessary environmental safeguard measures specified in the

EMP should be implemented by the contractor. Contactor should prepare

an Environmental Management Action Plan and submit to the Engineer

and should maintain close coordination with the Engineer/PMU.

10. Details of Persons Responsible for the Environmental Screening

Screening report completed by:

A Rajaratnam

Environmental/Social Specialist

EML Consultants (Pvt) Ltd.,

Contact No. 0714905101

Date: 26.04.2013

Signature

Screening report reviewed by

Chamal Niroshana Manage

Environmental Specialist

Project Management Unit


Ministry of Defense and Urban Development

Contact No: 0718680116

Date: 26.04.2013

Signature

Approved by

Eng. Rohan Seneviratne

Project Director

Project Management Unit


Ministry of Defense and Urban Development

Date: 26.04.2013

Signature

Annex 1 – Map of location of selected Roads

Annex II - Existing Situation of Roads

Jesmine Place - Nawala

Wimalawatta Road

Maliban Arama Road

Nugegoda Pagoda Road 1st Cross Street

Walter Gunasekara mawatha

Thilaka Garden

Nagavihara Road

Somathalagala Rd

Baddagana Vihara Road Pelawatta Road

Maliban Arama Road Rajagiriya Park Road

Annex III – General Designs for Roads

Typical designs for Drains

Metro Colombo Urban Development Project - Sri Lanka … · Metro Colombo Urban Development Project...

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