World Bank Document · 2016. 7. 17. · Item Description Unit Rate in TAS Sum in TAS 1 Core drilling -rock 36 m 150,000.00 5,400,000.00 2 Soil drilling 4 m 50,000.00 200,000.00 3

Emergency Power ProjectsEnvironmental Audits of the Thermal Power Plants and Power Co-generating Units:

PRELIMINARY HYDROGEOLOGICAL INVESTIGATIONS

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MWANZA NYAKATO POWERSTATION

Report by:Leonard B. Kassana,

Directorate of Corporate Planning & Research,Tanzania Electric Supply Company Limited,

P.O. Box 9024, Dar es Salaam.Tanzania.

April 2004.

Leonard Kassana/Nyakatosubstation ReportCover I Page I of 1 4/14/2004._ FIE C Y' -" h '' ;wsw_~~B _

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Emergency Power ProjectsEnvironmental Audits of the Thermal Power Plants and Power Co-generating Units:Preliminary Hydrogeological Investigations at Mwanza Nyakato PowerStation

TABLE OF CONTENTS

1. INTRODUCTION

2. SCOPE OF WORK3. INVESTIGATIONS4. RESULTS5. CONCLUSION AND RECOMMENDATION6. REFERENCES7. APPENDICES:

a. Appendix 00: Field LSD Resultsb. Appendix 01: Draft Terms of Reference of Environmental Audits of thec. Appendix 02: Machines technical Specifications (Equipment Data Sheet)

and Additional notes by the author of this reportd. Appendix 03: Mapse. Appendix 04: Photo documentation during the Investigations

Leonard Kassana/Preliminary Hydrogeological Investigations Page 1 of 5 4/15/2004


1. INTRODUCTIONThis work is a part component of the Environmental Audits of the Thermal Power Plantand Power Co-generating Units Projects that are currently on the discussion tablebetween the World Bank and TANESCO. There are three options that are beingconsidered for implementation for assisting TANESCO to meet its emergency powergeneration needs due to poor hydrological conditions in its critical catchments areas.Details on the 3 options in subject are found in the Draft Terms of Reference forEnvironmental Audits of Thermal Power Plant and Power Co-generating Units herebyappended (Appendix 01) for the reader to refer to.

The option that is being worked on is the one that includes 18x 1 Mw plant to be leasedfrom the Geita Gold mines to be installed at TANESCO'exisitng generations site atNyakato, Mwanza. See Appendix 02 for the specifications of the machines andAdditional notes on the rudimentary financial analysis by the author of this report.

2. SCOPE OF WORKThis part of the work is to assist and guide the environmental audit for the MwanzaNyakato PowerStation. The geological work was commissioned to TANESCOEngineering Geologist, Eng. Leonard Kassana for making preliminary assessment ofthe hydro-geological conditions of the area within the following scope:

2.2. Preliminary assessment of water table in the area2.3. Preliminary assessment of the geological formational lithology within the site2.4. Tentative location of boreholes that are meant for monitoring pollution of ground

water by water and oil effluents from both existing and planned thermalgenerating units

2.5. Possible direction of the groundwater in the area2.6. Establish tentative costs for boreholes to be drilled at the site.

3. INVESTIGATIONSThe following methods of investigations were applied during the course of this shortstudy:

3.2. Interpretation of topographical maps at 1:50,000 and 1:2,5003.3. Geological map at 1: 100,0003.4. Light Static and Dynamic Sounding (LSD) as pilot hole for hand augering3.5. Hand auger to assess lithology and ground water table3.6. Survey and interview local professionals around the site regarding

hydrogeological conditions.

4. RESULTS4.1. Site Geology: The site lies within Greenstone belt of Tanzania whose age is

within Precambrian age. The site lies about 7 km along Mwanza - Musoma road.The area is underlain by Granite and due to the preliminary nature of this study,the author of this report is not able to differentiate the granitic rock. The averagebedrock level at the site varies between 1.6 m and 2.0 m as preliminarilydetermined by Light Static and Dynamic Sounding method (see Appendix 00).


* *1


In the yard, there are few granitic outcrops scattered, protruding above thesurface. Spherical weathering is much dominant in the area making vertical andlateral jointing system to be very important. For more information on regionalgeology, the reader is referred to the provisional publication of the quarter degreesheet (QDS) #33 of Mwanza by Geological Survey of Tanzania, 2002.

The site is covered by the soil derived from granitic rock whose thickness variesbetween 1.6 m and 2.0 m. The hand augured samples have the followingcharacteristics:Table 1: Preliminary Lithology at Nyakato PowerStation areaDepth in m Description Remarks0.0 - 0.2 Brown, loose, Silty SAND0.2 - 0.6 Grayish Brown Sandy SILT0.6 - 0.8 Grey fine Sandy SILT0.8- 1.6 Reddish Brown Clayey Sandy This is equivalent of

SILT with occasional gravels weathering grade IVNB: Groundwater in the hand auger hole is Dry.For visual view, the reader is kindly referred to the photos in Appendix 04.

4.2. Hydrogeology of the site: Preliminary investigations during this period showthat hydrogeology of the site is much controlled by underlying the graniticenvironment. The underlying rock is shallow seated ranging from 1.6 to 2.0 mdepth. The underground drainage is controlled by rock mass jointing system. Therock mass is dominated by vertical and lateral jointings due to special type ofweathering known as spherical weathering. Soil mass is derived from granite andthe nature of the soil is much sandy hinting that soil permeability may bemoderate to high.

Findings from the light and shallow sounding and borings done during this shortstudy show that water table are deeper than 2 m. The groundwater measurementsin 3 LSD holes using water dipper showed that all of them are dry down to 2 m.This exercise took place in the month of March 2004 toward the end of dryseason. According to the Civil Engineer, Tanesco Mwanza, Mr. Nnunduma, thewater table was struck at 3 m in the soak pit dug at about 100 m south east of theLSD2/HA1 for the substation staff houses.

The bedrock is very shallowly inclined, dipping between south east to east hencesomehow governing the general flow direction.

More hydrogeological parameters must be investigated in the future to determineabsolute permeability of the soil mass and rock mass. Insitu permeability testshave to be done in the boreholes that will be drilled at site. Water table will alsobe confirmed during this future exercise.



4.3. Observation BHs:Based on site conditions, two boreholes (BHs) are proposed to be drilled at twotentative locations in the order of 200 m apart, see the site map on Appendix 03.One BH will be located at location behind the old power house but downstream ofthe Oil interceptor pit. The reason for this proposed BH:

* To monitor ground water pollution 'which I think has been caused bydischarge of oil due to the collapse of the pit. This happened at the time ofour stay.

* Oil spillage around the oil interceptor has been significant and it istherefore recommended to monitor the pollution in the ground water.

The second BH will be at a location considered suitable enough to intercept theflow of the ground water of any effluents from the would be new installations.

The preliminary costs for borehole drillings are based on the discussionsconducted with Mr. Theobald Theonest, Head of Drilling Section, Drilling andDam Construction Agency at Mwanza Office.

Table 2: Indicative Costs for BH Drilling and Testing at Mwanza Nyakato P/SItem Description Unit Rate in TAS Sum in TAS

1 Core drilling - rock 36 m 150,000.00 5,400,000.002 Soil drilling 4 m 50,000.00 200,000.003 Lugeon Test 8 nos 50,000.00 400,000.004 Insitu Soil Permeability, 4 30,000.00 120,000.00

_____ 4 tests

5 Mobilization and Ls 2,000,000.00Demobilization

6 SUBTOTAL 8,120,000.007 Contingency (23%) 1,880,000.008 SUBTOTAL _ 10,000,000.00

Notes: These costs are not meant to cater for casings material as part of thepermanent stabilization of the observation holes which could not be immediatelyestablished due to time constraints of this work.



5. CONCLUSION AND RECOMMENDATION*: Field observations at site show clearly that oil spillage around the area is

notable. Areas around 'oil interceptor, storage tanks and drainage systemfor extracted water from oils' show the extent of pollution on the ground.See appendix 4.

*: The soils in the area are sandy in nature and rock mass is granitic whosedominant jointing type is due to spherical weathering. Jointing systemmay be moderate but infillings between the joints/faults may range fromclayey to gravel materials which govern the degree ofconductivity/permeability of the discontinuities.

*: It is therefore recommended to have two observation boreholes within thesite of Mwanza Nyakato PowerStation to cater for pollution monitoringadequately. The indicative budget for drilling and testing is given in table2. Recommended depth for each borehole is 20 m to cater for maximumpossible interception of discontinuities.

*: Equipment for water sampling and ground water measurements in theobservation holes must be purchased and kept at site.

* Recruiting a staff at Mwanza for sampling and measurements is essential.This may be done by experts from Tanesco HQ during the drillingsupervision and testing period. A cost for the equipment will beestablished at that in the later stage of the implementation.

*: A schedule of observations, sampling and testing should be devised by theEnvironmental Engineer.

*: Analysis of the results should be done by TANESCO HQ EnvironmentalEngineer who will be responsible for advising on the strategies how tocontrol pollution.

6. REFERENCES:* Nilsen, B & Palmstr0m, A, 2000: Handbook #2, Engineering Geology and

Rock Engineering, Norwegian Group for Rock Mechanics (NBG).*: Survey and Mapping Division, Government of the United Republic of

Tanzania, 1994: Topographic Map 1:50,000, Mwanza, Sheet # 2, Edition2-TSD.

* Geological Survey of Tanzania, 2002: Provisional Mwanza QuarterDegree Sheet #33 and Part of 21, 1:100,000, Initially GeologicallySurveyed by G.M. Stockley Geologist 1940.


Measurement of Baseline Environmental InformationAt Mwanza Power Station

ByDr. Eno& Masara

Chemical and Process Engineering Department, University of Dar es Salaam

1. Introduction

The Mwanza power station is located in a rural area. There are no high risingstructures (i.e. tall buildings, hill tops, or thick forests) in the vicinity. The dispersionof exhausts from stacks is thus free without significant downwashing due to highrsing structures.

The setting of the investigation is shown in Figure 1. Major sampling points arenumbered (1-17) and labelled (A - D). Note that Figure 1 is not true to scale.

The following investigations were carried out as required bythe client:

i) Noise measurement (results in Table 1);ii) Ambient air measurements for C0 2 , 02, NO. and SO. (results in Table 2);iii) Soil sampling and testing for heavy metals, and S0 4 2-, Cl- and NO3- (results

in Table 3);iv) Water sampling: ground or surface and testing for S04 2-, 1- and NO3- and

phenols (results in Table 4); andv) Sampling and testing for PCBs

Sub Station/Switch Yard

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Figure 1: Site Location

2. Results

2.1 Noise

The generator house has four generators but only one is operational. The generator israted at 3.5 MW (rated down from 4.5 MW when new) and was working at full load.The Noise level measurements were done at point 1 -15. The results are shown inTable 1.

Table 1: Noise Measurement Results

Measurement Points\ 1 21 31 41 51 61 71 81 91 10 111 121 131 141 1

Noise inecibels 9 6 9492 92 94 94 96 96 86 82 72 84 82 7272

2.2 Air quality

The air quality was measured at points 15 and 16 (Figure 1) and A - D (Figure 2).Results are shown in Table 2.

Y Wind direction

B 0.7m c

0.5 mGenerator house 0.5 m

A

0.5 m

CGate

Figure 2: Some Air Quality Measurement Points (not true to scale)

3

Table 2: Air Quality Measurement Results

Temp 02 GO Go, NO° NO SO2

°C PPM PPM % PPM PPM PPM

A 34.000 20.900 0.000 0.000 0.000 0.000 1.000

B 35.000 20.900 0.000 0.000 1.000 1.000 0.000

C 38.000 20.900 0.000 0.000 0.0001 0.000 0.000

D 20.900 0.000 0.000 0.000 0.000 0.000 1.000

E 38.000 20.680 1.000 0.100 1.000 1.000 1.000

F 75.000 20.300 51.000 0.300 40.000 38.000 12.000

G 38.000 20.900 0.000 0.000 1.000 1.000 1.000

16 38.000 20.7001 0.000 0.100 0.000 0.000 0.000

15 [ 39.000 20.8001 0,000 0.100 0.000 0.000 1.000

E: Inside the plant; F: At stack outlet joint; G: At operator's table

2.3 Soil sampling

The soil was sampled one the site where the new generators will be installed at point

13 and 14 (point 13 is 50 meters from the east side fence and 10 meters from the

fence bordering the staff houses while point 14 is 60 meters from the east side fence

and 13 meters from the fence bordering the staff houses) along a storm water drain

path. Results are shown in Table 3.

4

Table 3: Soil Analysis Results

.____ Concentration in ng/k _ Concentration %w/w

Depth C K Na Electrical &ldoride Sulphate Nitrate[in] Ca Al Zn Cr Pb Fe Mn C K N N%Conductivty (I S042. NO 3 -

i_|__ tl __ S Zn | _ | pH ms/cm0 78.647 646.412 0.000 0.000 0.000 123.896 135.747 0.000 0.000 73.260 349.063 7.4 113.300 3.460 0.035 0.001

14 0.5 57.149 1,617.425 462.584 0.000 0.000 1,158.076 78.715 0.000 0.000 74.402 233.988 6.4 35.600 2.730 0.052 0.001

1.0 65.279 337.648 34.890 0.000 0.000 59.651 0.OX 0.000 0.000 56.275 300.507 5.7 33.800 2.890 0.009 0.005

_1.5 _ 55.782 1,510.750 84.834 0.000 0.000 1,124.927 63.916 0.000 0.000 80.186 300.988 5.8 216.000 2.800 0.021 0.005

13 0 268.151 1,517.835 0.000 0.000 0.000 34.151 129.016 0.000 0.000 65.773 316.216 6.4 58.700 2.690 0.025 0.001

0.5 229.612 1,319.609 571.391 0.0 0.000 51.465 40.908 0.000 0.000 52.743 269.200 7.4 54.800 2.22 0.051 0.001

5

2.4 Water sampling

No water wells were seen in and around the site, there is however a drain channelsthat collects storrn water from the generator site and exits behind the staff houses bythe substation, this is the water that was sampled. At the time of sampling, the waterwas stagnant. The results of the analysis are shown in Table 4.

Electrical Chloride TotalTotal KjedhalpH Conductivity Ca S 4ph2ate soal s Nitrogen

[ms/cm] [mg/l] 04 mg/l [mg/,]

7.400 229.000 189.9401 30.000 14.180

2.5 PCBs testing

A number of decomnnissioned transformers are stored on site (on the site the newgenerators will be installed), these transforners were inspected to identify year ofmanufacture, place of origin, oil type, etc, for the purpose of checking if thetransformer oils were contaminated with PCBs, One transformer, fairly old by look ofdesign, and which had no name plate was sampled and the oil tested using the Clor-n-oil PCB screening test kit. The test kit works on the principle of chloridedetermination since PCBs are chlorine based materials. Results showed that the PCBslevels, if any, are less than 500 PPM which is the threshold management level in manycountries including developed countries.

3. Conclusions

The power station is bordered by VETA, Nyakato steel mill, Birchad oil mill and theNyakato bottling plant on the North (across the main road) and the Mwanza knitting(a nails plant now closed down) on the west. If operations from these industrieschange significantly, the air quality and noise levels will be modified and deviate fromthe results of this measurement.

The results reported are for environmental conditions that were prevailing on the dayof measurement, 27th March 2004 (34oC, and still wind of about 3.4 m/s).

6

ESTIMATES FOR CIVIL WORKS AT NYAKATO POWER STATIONSUBSTATION - MWANZA: OIL INTERCEPTOR. OIL FILTER INCINARATOR AND TRENCHES

ITEM NO DESCRIPTION QTY UNIT RATE AMOUNTTShs

SUBSTRUCTURE EXCAVATIONAND EARTHWORKS

A To remove vegitable soil and levelling. 18 sqm 1500 27.000.00B Excavate trenches and interceptor 125 cum 4500 562,500.00C Hardcore filling 10 cum 4000 40000D Earth backfilling 33 cum 3000 99,000.00E Remove surlus materials 20 cum 4000 80,000.00

Concrete works;Concrete mix 14:8

F 50 mm blinding bed; 50 mm 9 sqm 8000 72,000.00Concrete mix 1:3:6

G Horizontal bed; 100 mm 9 sqm 11000 99,000.00Slab 1:2:4

H Oil interceptor slab 0.5 sqm 130000 65,000.00I Trench covers; 75 mm 70 sqm 10000 700,000.00

FormworkI Vertical edge of edge 6 m 2500 15,000.00

Walling; Block workJ 230 mm 38 sqm 11500 437,000.00

ReinforcementK Mild steel 10mm bars 36 kg 1500 54,000.00L BRC reiforcements 280 kg 1500 420,000.00M Stone pitching 295 sqm 13000 3,835,000.00

Cement and sand screed (1:3)N Floor and paving 6 sqm 4500 27,000.00

Intemal plasteringO 15 mm to walls 54 sqm 3000 162,000.00

PVC pipeP 150 mm pipe 65 m 8500 552,500.00O 100 mm bend 6 pcs 6500 39,000.00R 100 mm pipe 12 m 6500 78,000.00S Spreading of aggregates at oil tanks 0 sqm 4500 -T Removal of oil contaminated soil and

rplacement of the same by fresh earthfill 20 sqm 20,000 400,000.00TOTAL 7,764,000.00

ADDlContingencies 10% of 7,764,000.00 776,400.00I_____ TOTAL COST 8,540,400.00

2

ESTIMATES FOR CIVIL WORKS AT NYAKATO POWER STATIONSUBSTATION - MWANZA: YARD FOR STORAGE OF DEFECTIVE TRANSFORMERSAND SPREADING AGGREGATES AT FUEL TANKS

ITEM NO DESCRIPTION QTY UNIT RATE AMOUNTTShs

SUBSTRUCTURE EXCAVATIONAND EARTHWORKS

A To remove vegitable soil and levelling.300 mm 400 sqm 1500 600,000.00B Hardcore filling 400 cum 4000 1,600,000.00C Remove surlus materials 120 cum 4000 480,000.00

Concrete works;Concrete mix 1:4:8

D 50 mm blinding bed, 50 mm 400 sqm 8000 3,200,000.00Concrete mix 1:2:4

E Horizontal bed; 100 mm 400 sqm 13000 5,200,000.00Formwork

F Vertical edge of edge 15 sqm 2500 37,500.00Walling; Block workReinforcement

G BRC reiforcements 1600 kg 1500 2,400,000.00H Spreading of aggregates at oil tanks 576 sqm 4500 2,592,000.00

TOTAL 16,109,500.00

ADDl ______ Contengencies 10% of 16,109,500.00 1,610,960 00l _____ TOTAL COST 17,720,460.00


APPENDIX 00

Field LSD ResultsTABLE LSDl:

Detph Penetration in Load Blows/0,2m Soil, etcof Point in in kNin m0,2 0,2 6 Top Soil0,4 0,2 19 Loose sandy SILT0,6 0,2 16 - ditto-0,8 0,2 13 - ditto-

1,0 0,2 8 Very Loose Sandy SILT1,2 0,2 8 -ditto-1,4 0,2 12 Loose Silty SAND1,6 0,2 36 Medium dense Silty SAND1,8 0,2 45 - ditto-2,0 0,2 132 Very dense Clayey Silty SAND (Weathering

grade III/IV)Note: Terminated at estimated bedrock.

TABLE LSD IA: Located at 10 m North of LSDIDetph Penetration in Load Blows/0,2m Soil, etcof Point m in kNin m

0,2 0,2 8 Very Loose Sandy SILT0,4 0,2 15 Loose Silty SAND0,6 0,2 16 - ditto -0,8 0,2 20 - ditto -1,0 0,2 17 - ditto -1,2 0,2 14 - ditto -1,4 0,2 15 - ditto -1,6 0,2 18 - ditto -1,8 0,2 20 - ditto -1,95 0,15 51 Very dense Clayey Silty SAND (III/IV)

Note: Terminated at estimated bedrock.

TABLE LSD 2: Located at 50 m N 120°E of LSD IA under 132 kV MZA-MU Transmission Line betweentower I & 2

Depth Penetration in Load Blows/0,2m Soil, etcof Point m in kNin m

0,2 0,2 9 Very Loose Sandy SILT0,4 0,2 25 Loose Sandy SILT0,6 0,2 8 Very Loose Sandy SILT0,8 0,2 6 - ditto -1,0 0,2 12 Loose Sandy SILT1,2 0,2 67 Dense coarse Sandy SILT1,4 0,2 67 - ditto -1,6 0,2 I11 Grade III/IV

Note: Terminated at estimated bedrock.

Sounded by: Leonard Kassana/March 2004 at Mwanza Nyakato PowerStation

Leonard Kassana/Nyakatosubstation LSDI Page 1 of 1 4/7/2004

APPENDIX 01

Environmental Audits of Thermal Power Plant and Power Co-generating Units

Draft Terms of Reference

Background

The Government has applied to IDA for an Emergency Power Generation Project whichis currently under preparation. The following are the options that are being assessed to assistTANESCO in meeting its emergency power generation needs:

(i) Incremental Fuel for Existing Thermal Power Plants: imported fuel to run the two existingthermal power plants - at the Ubungo (up to 120MW) and Tegeta/IPTL (100MW) Power plantfacilities, at outputs exceeding non-drought generation levels (i.e. fuel costs incurred to offsetthe impact of the drought). It should be noted that with regard to the Tegeta power plant, IDA isreviewing the possibility of purchasing kWh output in accordance with the PPA, instead of fuel.

(ii) Emergency Power Plants (EPPs): capacity payments and fuel costs for 30MW of newshort term, leased emergency power generation required to compensate for the reducedhydropower output which is the result of drought. The EPP would be installed at the existingUbungo Power Plant facility, and would be fueled by gas. An EIA and Environmental audit hasalready been carried out at this project site for the Songas facilities, under Credits 3569-TA and2497-TA.

(iii) Auto-generator Fuel and COgaciiy PgMents: cadacitv charges and fuel costs for up to 30MW of existing (domestic) auto-generation capacity to augment the leased capacity noted in (ii)above. This will include 18x I MW plant to be leased from the Geita gold mines an to beinstalled at TANESCO's existing generation site at Mwanza, and about 10 private sector auto-generators who will be providing power to the grid e.g.,(the sugar, mining and tobaccoindustries, etc.).

Based on the recent Bank mission's discussions with TANESCO and assessment ofTANESCO's generation needs during the remainder of 2004, for the purposes of thisassignment, only the following aspects of the proposed Emergency Power GenerationPlan have been included in the proposed Environmental Audit at this time': (a)Incremental power generation from the Ubungo and Tegeta Power plants as noted in (i)above; and (b) auto generation from the Geita 18xlMW gensets at TANESCO's Mwanzafacilities, which forms part of (iii) above.

All World Bank investments need to comply with World Bank Safeguard Policies andenvironmental guidelines as presented in the Pollution Prevention and Abatement Handbook(1998) and EFC environmental guidelines (Thermal Power Rehabilitation, Electric PowerTransmission and Distribution, Occupational Health & Safety, PCBS, General EnvironmentalGuidelines and Monitoring), which can be found on the following website:

(http://ifclnl.ifc. orglifcextlenviro.nsf/Contentlenvironmentalguidelines

As existing generation sites would be utilized, there is no resettlement involved. Theemergency power plants should be operated in compliance with World Bank Safeguard Policiesand guidelines. The World Bank Safeguard Policies applicable to this project are:Environmental Assessment (OP 4.01), and Natural Habitat (OP 4.04) because of potential oilpollution.

While occupational health standards for personnel working in the plants are known for theUbungo Power Plant Facility, an assessment of this aspect and the environmental situation wouldbe required for the Tegeta Power Plant (IPTL), and with regard to the TANESCO site at Mwanzawhere it is intended to install the Geita gold mines' 18xlMW gensets.

Objectives of the Environmental Audit

The objectives of the environmental audit are to help the Government of Tanzania todetermine the environmental liabilities and the need for remedial actions necessary to bring theenterprises into compliance with World Bank Safeguard Policies and environmental guidelineswith the objective to protect the health of workers and the general public living in the area and toprotect the environment.

It should be noted that an Environmental Impact Assessment and Environmental Auditshave already been carried out on the Ubungo Power Plant facilities as part of the Songo SongoGas Development and Power Generation Project (Credit 3569-TA). In addition, Songas hasprepared an Environmental Management Plan (EMP), including the monitoring of air emissions,which should be in effect. Hence, the proposed assignment should begin with a desk review ofthese reports and compliance with the existing EMP. Similarly, we understand that there areperiodic reports prepared by IPTL which should contain environmental and air emission data.TANESCO's environmental unit should review all available reports, and summarize the importantaspects in the Environmental Audit.

The proposed environmental audits would identify historic pollution at the Ubungo, Tegetaand Mwanza facilities, with a focus on hydrocarbons, and any need for remediation, includingurgency and costs. The audit would also analyze present waste management practices andpropose actions how to bring the waste management practices up to acceptable internationalstandards. If not already carriedout at the Tegeta and Mwanza facilities, TANESCO'senvironmental unit should analyze present air pollution and propose measures to bring airpollution in compliance with World Bank Safeguard Policies and guidelines (Pollution Preventionand Abatement Handbook 1998), and prepare an indicative budget, if required, to achieve thesegoals. Air quality monitoring equipment may already be available in Tanzania2 .

Scope of Work

The environmental audit will focus on the existing Ubung6 and Tegeta Thermal PowerPlant sites, and the proposed new site at TANESCO's facility in Mwanza where the 18xlMWgensets from the Geita gold mines will be installed. The environmental audit will be carried out intwo phases:

Phase 1.- Meetings and Review

There will be initial briefing meetings between TANESCO's environmental unit and relevantstaff at the Ubungo, Tegeta and Mwanza power plant sites, as well as with other relevantgovernment representatives as deemed appropriate, such as Government of Tanzaniaenvironmental staff.

TANESCO will: (a) gather and review all existing relevant in-house documentation,including compliance records, for the Ubungo, Tegeta and Mwanza project sites; (b) study

available historical information; and (c) perform visual inspections of the Ubungo, Tegeta andMwanza facilities.

Phase I. Setting Priorities

2

Based the information made available in Phase 1, TANESCO's Environmental unit will:

* identify all environmental (e.g. air and water emissions, hazardous wastes such as PCBS,hydrocarbons, etc.) and occupational health and safety concerns related to both, past andongoing activities in the power plants;

* visit areas where practices of waste management, storage and the use of dangeroussubstances may have caused contamination (e.g. hydrocarbon pollution);assess hazards or risks for local communities and the adequacy of procedures for warningand emergency responses; consult with community leaders, if appropriate;

* prepare a prioritized list of concerns (i.e. high, medium, low) related to past activities in thesector;concerning environmental, health and safety concerns, provide recommendations and costestimates if any rehabilitation and clean-up measures are required;make recommendations and cost estimates for the implementation of any remediation actionplan deemed necessary to comply with IDA's safeguard policies. TANESCO should reviewthe existing Environmental Management Plans for the Ubungo and Tegeta facilities, andprepare an Environmental Management Plan for TANESCO's Mwanza site.

* TANESCO should assess whether any other World Bank Safeguard Policies might apply.

Reporting

TANESCO will prepare a draft environmental audit report after 5 weeks, and send it to IDAand NEMC for review and comments. Comments from the Government of Tanzania and theWorld Bank should be integrated to produce the final report which should be completed after 7weeks. The report should be written in English, and should include an Executive Summary. Thereport will be finalized only after incorporation of comments made by the Government ofTanzania and the World Bank.

The report should, if necessary, develop a prioritized remediation plan and its costs, definethe institutional responsibilities for clean-up; define the roles and responsibilities of agencies inthe monitoring and evaluation of clean-up and for regular follow-up, such as monitoring of air andwater emissions and hydrocarbon pollution and occupational health and safety.

Audit Team SkiUs

The environmental audit team should possess the necessary auditing skills as well as indepth knowledge of the environmental aspects of the electricity sector.

NoteJ If additional auto-generation or foreign EPP components were to be added to the proposedproject due to continued poor rains in the key catchment areas, an environmental audit of thesesites would be required.

2 TANESCO may wish to contact Songas (Phil Mason) since Songas hired the University to carryout air quality monitoring on its behalf, and TANESCO might wish to pursue the same for theMwanza site.

3

w ~~~~~~~

. . ... . . C

a _ J Tsc GCricrating Sct D;I: ?MIr 1 '99cg reko=* 517 Isk,cigg .1560flz 125O!kYA~

COH.7 1250hNY )rP t',e I of 3

I Modcl .Rc" 2 1HC20jrK:.TA50G3: r 2 Part Nunibcr Ref 602020 6020'1I

602027 602052

602032 602054 I 4602033 602055

602034 6020563 Specification Ref G32.00164 7stallation Drawing SEE VO TE (flX Ref A05.0001

,5 Maximum Ambiest °C (°F) 45 (113) 45 (113)6 Electrical Output Hz 50 60s*, ! ISO 8528-1

- Continuous PoNver (COP) kW (kVA) SEE IO r7v) 920 (1151)- Prime Power (PRP) kW kVA) 1034(1293) 1165(1456)- Permissible averagc ofPRP % 70 70IS03046/1

-Fuel Stop Power/Standby kW (kVA) 1157 (1446) 1294 (1618)Single Step load application 5; S6 56

7 Alternator

Class F Te:rp. Rise (105°C)

- Three phase kWV(!;VA) 1080 (1350) 1300 (1625)- Single phase ' kW (kVA) - -Ends Out

6Makc &Type

Newvage Stanford HC1734F2AVR

MX321Regulation % '0.5

8 CircuitBreaker SEE NvorE(Vi;) 7r.)

Make & Type Terasaki AT 25

Number of poles 4

Rating Amps 2590Trip Unit T)Tc

ElectronicOver!oad Protcctioa Rangc A;ps 1260 - 2750Short Circit Protecdon Range Amps 3150 - 40,000

9 Load Terinnals

Typc Busbar M12

10 Fuel Consumption SE_'NOTE fiv.

Standby/rucl Stop lit/hr(US gal/hOr) 293 (77.4) 330 (S7.0)100% Pri.e Power 263,(69.6) 293 (77.1)75% 203 (53.5) 225 (59.2)

50% l 143 (23.2) 162 (4.6)

Tcchnical Departmcnt - Dumbartont Approved by ,_ _

T-.~~~- ;~~~~~~~~~~~~~~~~~~~~~~~~~

2

GOU.z 1250kWN ! age l2oi3

11 Running Hours SEE,NOTF4v)100% Prime Power -loers 4.9 4.475% 6.3 5.750% 9.0 8.0

12 Exhaust Emussiorsi SEE Th .

Measurement Method Cuurnirns Exhaust Emussions Data SheetSpecific Load 100% Prime 4 2% CPL2227NOx - Oxides of Nitrogen (g/kW.h) 16.75 17.82PM - Particulate Matter 0.20 0.07CO - Caboa Monoxide 3.59 0.67,, -H-UnbwDt Hydrocatrbonsi 0.17 0.20

13 Exhaust SluenceroaonMake & Type Industrial & Marine SilencersCertificate No DnV M-6702 M-8154Permiissible back presFaue mum (ins) Hg 13 (0.5") 13 (0.5")

14 Noise

Sound PoAtr-EEC dBA (Lw) 104Certificate No Not AvailableSound Prcssure at 1 metre dBA 89 94Sound Pressure at 7 metre dBA 78 82

15 Engine

Make & Type Cununins Diesel KTA 50 G3 CPL2227j Cylindersh&Fonn V16 60°

Aspiration Turbocharged & Aftcrcooled

J Fuel Pump Cununins PTGovernor Type_ .. Electronic

Ma,Me.& Model Cununrins EFCSteady State frcquency % 4 0.25Battery Voltage Volts 24

16 Overall Dimensions

-Length SE,NO TE4) Metres (feet) 6.06 (20'0")- Width Metres (feet) 2.44 (8'0")-Height Metres (f t) 2.60 (8'6")

17 Weight SEE NOT E6-VWithoutfucl Kg (bs) I9000 (41SOO)- With fuci Kg Obs) 20216 (44475)

Tclinical Department - Dumbarton Approved by .

7 .*~. > . ,, l, l 0 ' 2 5D \ **

CI. !L'. C' I 2,3 cr 3

18 Gapaciti:s

-Fucl gross Litres (US gall) 1431 (373.1)

usable- 1288 (340.3)

-Lub oil total 177 (46.7)

pan3 151-121 (.0-32)

-Coolant 383 (101.2)

19 External fuel supply

- Arnuximun above base Metres (feet) 2.40 (7'10")

-maximumbelowbase Metres(feet) 1.50(4'11")

i | i) On all sets nrunfactured from 20/09/94 to 20102/97 a vyider silencer ias fitted. Therefore, the folloving applies:

4. Installation Drawing Ref A05.0041

ii) On US sets (plant no. P6S13 to P6936) the following UL approved circuit breaker is finted:

8. Circuit BreakerMake & Type Merlin Gerin MP25Number of poles 3Rating Amps 2500Trip Unit Type STR5SUOverload Protection Range Arnps 960 - 2500 (rating plug dependent)Short Circuit Protection Range Amps 1440-25000 (ratingplugdependent)

iii) On US sets (plant no. 7585 onwards) and alt other sets (build date 27/05/9S onwards) a 4 pole UL/TECapproved version of the above circuit breaker is ftted.

S. Circuit BreakerMake & Type Merlin Gerin MP25Number of poles 4Rating Arnps 2500Trip Unit Type STR5SUOverload Protection Range Asnps 960 - 2500 (rating plug dependent)Short Circuit Protection Rangae Aps 14 '40 - 25000 (rating plug dcpendent)

iv) On KTA5OG3 cngines built to CPL152S a continuous baseload power limit of 750kW @ 50Hz is applied.

On KTA5OG3 engir.es built to CPL2227 (i.e. offset pistons and rematched turbos), a continuous bascloadpower limnit of 800kW @ 50lk is applicd.

Fuel consumption, rununing hours and cmissions data quoted refer to CPL2227.

v) On the DNV model the following apolics:

4. Installation Drawying RBcr A05.0105

16. Lengt!i N ftrcs (fc_t) 6. IS (20 3)

17. ','/cshL `5

'- 'it'tnt fucl Kg (ibs ) 20 i SO (4 t 15 ])- WViti fuiel Kg (Ibs) 21696 (47S31)

Techinical Department - DumbArton Approved by y _____y

l u u ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

^ ~ ~ ~ ~ ~ ~ ~ .- 4~

APPE , i~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~-

r~- ,- -l -

. ' -' ' * ' ,-' - 4 i 4 ~~~~~~~~~~, - t... - E @, .

t I ~ ~ ~~~~. i -- -I - - - ? -f

c~~~-d - ; - Lst

; - j . ., - X , X -~~~~~~~~~

.- ' , - & y - ,0 ~~~~~~~~~~~~ ~ ~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~-- - -- .T

, .& .:2 .00

..~~~~~~~~~~~~UE~ . . ) Pao wn h i~ t-'

* S ; ; ,~~~~~~~~~~~~~~~~~Tr~~ ly ~-caT -kl # ....:

APPENDIX 04

PHOTOS AT MWANZA NYAKATO P/S: courtesy:Leonard Kassana

-~~

2 L

Plate I: View to the South showing 'the proposed installation site' of the GeitaGenerating Units at Electrical Workshop yard at Nyakato P/S.

Plate 2: View to the North West showing 'the proposed installation site' of the GeitaGenerating Units at Electrical Workshop yard at Nyakato P/S.

Leonard Kassana Page I of 9 4/15/2004

comisioedin 1 78.

: g 2

-~~~~*.L - -

*q-~~~~~~ -4 e T; - f < @ -~~~~~~~~~

Plate 3: View to the East showing 'the proposed installation site' of the GeitaGenerating Units to be installed at Electrical Workshop yard at Nyakato P/S.

.

\~~~~~

Plate 4: View inside the existing Nyakato P/S. The thermal generating unit in view wascommissioned in 1978.

Leonard Kassana Page 2 of 9 4/i15/2004

.. _ -.E S

^ ~ ~ --|- -I .- .!.*

jIF~~~~~~~~~.A Lmw -i~~~~~~~~~~~~~~,t

- ;U -- _-1 * . - -U

N -

Plate 5: Showing waste Oil Separator pit and the water extraction pump at Nyakato P/S

~~~~~~~~~~~~~~~~~~~~~~~..

Plate 6: Showing P/S and Cooling water tanks at the background and in thefore ground showing extrated water from waste oil being discharge to theground

Leonard Kassana Page 3 of 9 4/15/2004

- I

111 -r I

Plate 7: Foreground showing separtoed water being discharge tothe ground

Plate 8: Showing one of the oil collecting pits at Nyakato P/S


-- -. J

Plate 9: Nyakato 220/132/33 kV Substation showing westemn part of thefacility as seen from the northern side

Plate 10: Nyakato 220/132/33 kV Substation showing eastern side part ofthe facility as seen from the northern side


U -

Plate I 1: View from the South showing existing busbar span where new jumpercan possibly be connected at the eastern part of the substation

Plate 12: View from the South showing existing busbar span where new jumpercan possibly be connected at the western part of the substation


} a;. I11 -- . i <__.~~Ik k

- A 45

~~~~ "V

Plate 13: LSD sounding at the possible location for the monitoring B3Hfor environmental polution control as part of the EMP

* },t1 * ' .A. '.~~~~~~* ~ '

I-- ~ ~~~' 111½-1¢si'ttS,w

'N -, 2. -

Plate 14: Hand augering at the possible location for the monitoring BH

Leonard Kassana Pag 7 of9 4/15/2004

!~~~~~~~~~~~~~~~~~~

.~~~~ IL~~~~~~~~~~~~..~~~~~~~~~

Plate 15: Soil samples to from the hand augred hole as plates 13 & 14


*~~~~~~~~~~~~~~~~~~

-~ I

Plate 16: Showing attempts to recover the stuck hand auger string

Plate 17: Test pit at the hand auger hole. Pit manuallyexcavated for recovering the stuck hand auger string


I S

V;. -E -

-~~~~~~~~~~~~~ VA

I~ ~~~

Plt 18 Nykk Poe.tto wna-Ve ftepooe iefrteisaln

of 18 x 1 MW mahie frmGet-Gl-Mn

- * a 4 ,~~~~~~~~~

,,~~~~~~~ ~ ., ,. _~~~~ -. K. -

* ~ ~ ~ *

___

Plte 19 AoePor aragmn of Cosruto Maeil htnedtearneBlwFululainbay shwn are wIthsiotmnto

2r.' _

Plate 20: Above and below: oil contamination from discharged effluent from drainageand interceptor

3

4 1 ) *

WV '

J.*-

. , ~~~~~~~~~~. _

Plate 21: Soil contamination from oil/fuel wastes behind the power station. The soil needto be replaced

4

~~~~~-' -

_ _ _~~~~~~~~~~~t

a

Plate 22: Non lined disposal pits for oil and fuel stained filters and wastes. Appropriatedisposal pits must be constructed

5

-~ ~ ~ ~ ~ ~~~~~~-t ~ ~ ~ ~ ~ ~ 1 W a -t

~~4 -'

"cra- r- - *

Plt:23 oidWsepoble sca maeil inid th oe oseadicastraeara.Tes oldwste shul bdspse

X 1 t t1 -- tJ 6

v Xl Z~~~

K ~ ~ ~

Plae 4:Saet cncrn -msigo rknsaswihnest erpae

7~ ^

A -

~~~~~~~~ 4L- -S

IL

Plate 25: Nyakato Mwanza- Dumped Transformers at the yard, some of them leaking theoil into the soil

8

-~~~ -9

~-U.. 1 J

. . . .. . . . . . . . . . . . . .

Plate 26: Geita Gold Mine - Generator sets to be installed at Nyakato Mwanza

9

r.~~~

.l~~~~~~~~~~~iS ,e

a e_

Plte27 ITL- megecycomuictin ysem(aov) ndCotanmnto

_g_:_|~~~rasfrer (elw

s*- lsiL~~~~~~1

I,~~~~~~~~~~~~~~~~~~~~ .. F

~~~~~~~~~-

-~~~~ * a- -

Wi~~~~~ .* -' *

.. -

Plt9:Snase -8:Solidgast sieakgregto foro safe0 durisposalato

LcL *s,i .tf~~~1

Documents

World Bank Document · 2016. 7. 17. · Item Description Unit Rate in TAS Sum in TAS 1 Core drilling -rock 36 m 150,000.00 5,400,000.00 2 Soil drilling 4 m 50,000.00 200,000.00 3