Chagville EIA

ENVIRONMENTAL IMPACT ASSESSMENT:

CHAGVILLE, TRINIDAD &

MARINE SPATIAL ZONING

Johnson & Goberdhan November 2014

Introduction

Location

Introduction

The Project

Re-nourishment of Chagville Beach

Rehabilitate Beach facilities

Placement of Breakwaters and Groynes

Introduction

Project Rationale

Chagville Beach is eroding

No natural supply of

sediments to the Beach

Requires annual

Maintenance Nourishment

Landside facilities in poor

condition

Unattractive to Tourists (L&I)

Introduction

Project Rationale

Achieve Development Objectives

Legislation and Regulatory Framework

National Environmental Policies

The National Environmental Policy (NEP)

The National Physical Development Plan

The National Wetlands Policy

National Biodiversity Strategy and Action Plan (NBSAP)

National Laws and Regulations

Environmental Management Act 2000

The Certificate of Environmental Clearance (CEC) Rules, 2001

The Certificate of Environmental Clearance (Designated Activities) Order, 2001

The Noise Pollution Control Rules, 2001

The Environmentally Sensitive Species (ESS) Rules, 2001

The Environmentally Sensitive Areas (ESA) Rules, 2001

Water Pollution Rules, 2001 as amended in Water Pollution (Amendment) Rules, 2006

Marine Areas (Preservation and Enhancement) Act

Occupational Safety and Health Act, 2004 and Amendment Act, 2006

Project Description Conceptual Design

Beach

Nourishment

Install

Breakwaters

Rehabilitate

backshore

facilities

Beach Nourishment

D50 - 0.45

Berm width -9m

Berm Elev 1.3m

Entire beach approx. 760m long

Volume: 23,700m3

Source: Guyana quartz sand

-3

-2.5

-2

-1.5

-1

-0.5

0

0.5

1

1.5

2

0 20 40 60 80 100

Ele

vation (

m)

Distance Offshore (m)

Existing profile

Design profile


Breakwaters and

Groynes

BW are on

average 80 90m

offshore

Crest Elevation at

0.0m

Placed in 4m water

Depth on overage

Crest set to msl

Boulders sized to resist

waves from cat 2 Hurricane


Breakwaters and

Groynes

Structure Length (m) Volume (m) BW1 125 5500

BW2 133 5852

BW3 100 4400

BW4 100 4400

BW5 122 5368

G1 41 902

G2 74 1628

Total 695 28050


Rehabilitate Beach facilities

Washrooms/Areas

Lifeguard House

Restaurants

Solid waste Disposal

Wastewater Disposal system

Storm Drains


Construction Method Nourishment

Deep draft/Large Capacity Barge from Guyana with

clamshell offloading to small barge

Small Barge and long reach excavator and small

draft (0.9m)

Bulldozer onshore

Project Description Construction

Construction Method Breakwaters and Groynes

Remove biophysical features in footprint of structures

Placement of turbidity barriers

Deliver boulders to site via barge from stockpile area

Place boulders on sea floor and build up to crest


Construction Method Breakwaters and groynes

Trucks along highway during off peak hours to wharf

Barge from Wharf to Site


Construction Phasing

Phase 1

Rehabilitation works (buildings, drainage, sewerage,

landscaping)

Placement of Groynes and Western Breakwaters

Phase 2

Nourishment of entire beach

Placement of Eastern Breakwaters


Environmental Monitoring (Construction)

Water Quality

Dust

Noise

Long term monitoring (Post Construction)

Currents

Shoreline location

Water Quality

Project Description Monitoring

Description of the Environment

Physical

Biological

Social


Physical

Topography

Steep hills

to the north

Site is

gently

sloping to

south


Physical

Hydrology

Rivers on

either

boundaries

Site drains

to sea


Physical

Bathymetry

Slopes 3%

out to 100m

offshore

Rapid fall

off after -

4m


Physical

Sediments

DESCRIPTION SAMPLE

LOCATION

MEAN MEDIAN CLASSIFICATION

(FOLK & WARD) mm mm

West

Upper Beach 0.31 0.31 Slightly Gravelly SAND

Mid Beach 1.16 0.86 Sandy GRAVEL

Lower Beach 0.25 0.26 Slightly Gravelly SAND

Central


Mid Beach 0.61 0.40 Slightly Gravelly SAND

Lower Beach 0.15 0.15 Gravelly SAND

East


Mid Beach 0.73 0.71 Slightly Gravelly SAND

Lower Beach 0.67 0.53 Gravelly SAND


Physical

Wind Waves and Currents


Physical


Location

Range

Hs (m) Tp (s) Dp ()

West 0.1 - 0.3 3.0 - 7.3 140 - 160

Central 0.01 - 0.2 2.5 - 5.7 140 - 165

East - - -


Physical


Circulation in gulf of Paria

due to Guina current

Carenage bay circulation is

characterized by slow

currents (15cm/s)

with westerly currents during

falling tides and easterly

currents during rising tides.

Alongshore currents due to

waves easterly 0.1cm/min


Physical

Shoreline Morphology

Shoreline use changed from swamp to beach


Physical

Shoreline

Morphology

Shoreline use

changed from

swamp to beach

Shoreline is

developed

Shoreline is

receding at

approximately

0.3m per year


Physical

Shoreline

Morphology

Shoreline use

changed from

swamp to beach

Shoreline is

developed

Shoreline is

receding at

approximately

0.3m per year

-3

-2

-1

0

1

2

3

0 20 40 60 80 100 120

Elev

atio

n (

m)

Distance (m)

20000120 20000822 20070518 20070926

20090421 20090727 20100121 20100729


Biological

Sea grass

Fish

Impact Matrix - Physical

During Construction Post Construction Positive Negative Short-term Long-term Low Moderate High Low Moderate High

Increased Noise Pollution (Use of Heavy

Machinery)x x x x x

Increased Air Pollution (Dust and Fumes) x x x x xIncreased Water Pollution (Oils,

Gasoline, Solid Waste etc)x x x x x

Spillage of Boulders and other materials x x x x xIncreased Sedimentation of the Marine

Environmentx x x x x

Increased Soild Waste Generated x x x x x xIncreased Traffic (Marine/Road) x x x x x xIncreased Wear and Tear of the Road x x x x x xReduced Wave Energy x x x x xReduced Current Speeds x x x x xReduced Beach Erosion x x x x xReduced Flushing Time x x x x xIncreased Beach Berm x x x x xVisual Asthetics x x x x x

Potential Impact

Physical

DurationNatureTiming Magnitude Significance

Impact Matrix Biological


Compression of Beach Sediment

(Burrowing Fauna)x x x x x

Introduction of Benthic Ecology x x x x xSedimentation (Wetlands, Seagrass and

other marine life)x x x x x

Release of Toxins from Sediment

(Wetlands, Seagrass and other marine

life)

x x x x x

Decreased Water Quality (Wetlands,

Seagrass and other marine life)x x x x x

Fish or Invertebrate Displacement x x x x xHabitat Fragmentation x x x x x

Biological

Potential ImpactTiming Nature Duration Magnitude Significance

Impact Matrix - Social


Increased Employment Opportunities x x x x xTraffic Congestion x x x x x xNo Use of Beach (Recreational Users,

Spritual Baptist, Lifeguards)x x x x x

Heavier Beach Use x x x x xIncreased Tourism x x x x xIncreased Recreation Activities

(Swimming, Watersports etc)x x x x x

Increased Recreational Safety (Reduced

Wave Energy for Swimming and other

Watersports)

x x x x x

Increased Bussiness (Retail) x x x x xIncreased Financial Cost to Users (Paying

to Use Facilities)x x x x x

Increased Security for Users x x x x xVisual Asethics x x x x x x

Timing Nature Duration Magnitude Significance

Social

Potential Impact

Mitigation Measures

Monitoring of decibel levels

Construction will stop before nightfall

Appropriate PPE for all persons on site

Air Quality Monitoring. If threshold exceeded, work will be stopped.

Occasssional 'wetting'

Water Quality Monitoring

Proper inspection and maintenance of all vessels

Proper storage of solid waste until disposal

Spill Plan : Alert CDA. Personel trained to respond approriately

Trained personel

Spill cleanup


Wash Boulders at Source

Sediment traps/silt screens

Adequate bathroom and garbage facilites


Reduce Road Traffic - Use of barge

Avoid peak traffic times

Increased Wear and Tear of the Road Use of barge instead of trucks

Opening in Breakwaters

Aim to improve water quality - flushing becomes less crucial

Increased Noise Pollution (Use of Heavy

Machinery)

Increased Air Pollution (Dust and Fumes)

Increased Water Pollution (Oils,

Gasoline, Solid Waste etc)

Spillage of Boulders and other materials

Increased Sedimentation of the Marine

Environment

Increased Soild Waste Generated

Increased Traffic (Marine/Road)

Reduced Flushing Time

Mitigation Measures

Physical

Potential Impact of Negative

Nature

Mitigation Measures

Compression of Beach Sediment

(Burrowing Fauna) Reduce useage of heavy equipment


Wash Boulders at Source

Sediment traps/silt screens


Stop work and initiate cleanup if toxicity is too high


Proper inspection and maintenance of all vessels


Spill Plan : Alert CDA. Personel trained to respond approriately

Fish or Invertebrate Displacement No Mitigation

Habitat Fragmentation No Mitigation

Loss of Habitat in footprint of Structures No Mitigation

Loss of Flora in footprint of Structures No mapped flora - possibly no impact

Sedimentation (Wetlands, Seagrass and

other marine life)

Mitigation Measures

Biological

Release of Toxins from Sediment

(Wetlands, Seagrass and other marine

life)

Decreased Water Quality (Wetlands,

Seagrass and other marine life)

Potential Impact of Negative

Nature

Mitigation Measures

Reduce Road Traffic - Use of barge

Avoid peak traffic times

Avoid peak times (Mar, Jul, Aug, Dec)

Phased Construction - Minimal Closure Time

Increased Financial Cost to Users (Paying

to Use Facilities) No Mitigation - Necessary for upkeep

Visual Asethics Breakwater height at MSL - minimal disruption of view

Traffic Congestion

No Use of Beach (Recreational Users,

Spritual Baptist, Lifeguards)

Social

Mitigation MeasuresPotential Impact of Negative

Nature

Alternatives

No Action

No cost involved

Beach does not meet its full potential

Continued degradation

Unsafe beach

Alternative Site for Development

Encourages development at other locations

May not be feasible at other locations

More time involved Assessment of alternative sites

More cost involved

Protect Existing Beach

Less cost involved than Nourishment

Only some portions of the beach are currently useable

Narrow beach with unsightly structures

No improvement to visitors

Monitoring and Management

5 year Monitoring and Management Plan

Waves and Currents

Beach Profiles

Integrity of Structures

Water Quality

Sediment Quality

Benthic Ecology

Mangrove Survey

Sea grass Survey

Recommendations would then be given to determine if Monitoring and Management Plan should continue

GIS

Beach Profiles

Rivers

Roads

Coastline

Bathymetry

Existing Seawall

Study Area

Wetland

Trees

Buildings

Car Park

Proposed Groynes

Proposed Breakwaters

Public Consultations

Questionnaire

Description of Interviewee

Housing, Health and Social Services

Specific Issues Regarding the Project

Employment and Income

Education

Range of persons interviewed

Lifeguards

CDA employee

Vendor

Recreational Users

Public Consultations - Findings

Public Consultations - Findings

Major Concerns about Chagville

Crime

Pollution

No sandy beach

Drainage

Suggested Improvements

Beach Facilities

More Lifeguard Presence

Regular Clean-ups

No Smoking Zone

Zoning

Coastal Zoning?

Coastal management tool

Based on a concept of separating and controlling

incompatible uses

Can be modified to suit varying social economic and

political environments

Zoning

Development Plan and CDA objectives

Recreation (insert image)

Ecotourism (website)

Conservation (website)

Zoning

Mechanics of Zoning

Allowed, allowed with permission

Prohibited, allowed with permission

Zoning

Plan

Zoning

Plan

Area Category Activities Allowed Notes

1 Preservation

area Snorkelling with permit Area has seagrass beds which are

to be protected

2 Water Sports non motorized sports, canoeing,

floating provides a buffer for protected

areas

3 Channel Motorized sports with permit,

yachts, cargo vessels provides access to existing

boating facilities

4 Water sports motorized sports with permit;

motorized sports without permit

5 Preservation

area Snorkelling with permit

Outfall for river, has degris from

time to time that needs to be

remived, sediment bars are also

present which can increase

turbidity if disturbed

6

Recreational

Bathing/Swim

ming Snorkelling, swimming, floating shallow beach are suitable for

recreational swimming

Chagville EIA

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