World Bank Document

THE UNIVERSITY OF ZAGREB FACULTY OF CIVIL ENGINEERING Public Disclosure Authorized S U M M A R Y OF ENVIRONMENTAL IMPACT STUDY FOR PUBLIC WATER DRAINAGE BIOGRAD NA MORU Public Disclosure Authorized Public Disclosure Authorized Public Disclosure Authorized ZAGREB, NOVEMER, 2003 ORDERED BY: HRVATSKE VODE ZAGREB, Ulica grada Vukovara 220 CONTRACTOR: UNIVERSITY OF ZAGREB FACULTY OF CIVIL ENGINEERING ZAGREB, Fra Andrije Kačića Miošića 26 PROJECT NAME: SUMMARY OF ENVIRONMENTAL IMPACT STUDY OF PUBLIC DRAINAGE SYSTEM – BIOGRAD NA MORU PROJECT STAGE: STUDY PROJECT MARK: 120-S-220 PROJECT MANAGER: DOC. DR. SC. DAVOR MALUS IN ZAGREB, NOVEMBER, 2003 HEAD OF HYDROTECHNICS INSTITUTE: PROF. DR. SC. MARKO PRŠIĆ C o n t e n ts 1. Purpose of Project Implementation................................................................... 1 2. Legal and Administration Frames..................................................................... 1 3. Description of Project ...................................................................................... 2 4. Basic Data…..........................................................................................….. 6 4.1. Climatic Conditions ....................................................................................... 6 4.2. Oceanologic Data ........................................................................................ 6 4.3. Geologic and Seismologic Data ....................................................................... 7 4.4. Bioecologic and Landscape Data ................................................................... 7 4.5. Sociologic and Urban Data .............................................................................. 8 4.6. Data on Protected Nature and Cultural Heritage ........................................... 8 5. Overview of Environmental Impact.................................................................. 8 5.1. Impacts in Course of Plant Construction........................................................... 8 5.2. Impacts in Course of Plant Operation............................................................... 9 5.3. Impacts upon the End of Operation ....................................................... 11 5.4. Impacts in Case of Ecological Accidents...................................................11 5.5. Risk Assessment....…............................................................................. 12 6. Analysis of Alternative Solutions…...................................................... 12 7. Environment Protection Measures.......................................................... 13 7.1. Protection in Course of Construction...................................................... 13 7.2. Protection During the Operation............................................................ 15 7.3. Protection upon the End of Operation.................................................... 17 7.4. Protection in case of Ecological Accidents............................................. 17 8. Environment Management...................................................................... 18 9. Program of Environment Status Monitoring........................................... 21 9.1. Program of Seawater Quality Monitoring............................................... 22 9.2. Program of Air Monitoring..................................................................... 23 9.3. Noise Level Monitoring.......................................................................... 23 9.4. Monitoring of Flora and Fauna.............................................................. 24 10. Enclosures.............................................................................................. 24 10.1. List of Authors of the Study................................................................... 24 10.2. References.............................................................................................. 25 Laws and Other Regulations................................................................... 25 Studies and Designs................................................................................ 25 10.3. Overview of Meetings............................................................................ 26 S U M M A R Y 1. Purpose of the Project In the area of Biograd na moru wastewater is discharged into the coastal sea untreated or insufficiently treated, thus polluting the sea, endangering human health and reducing biodiversity of the sea ecosystem. By construction of a public drainage system, including a wastewater treatment plant in Biograd, further pollution and deterioration of sea water quality will be prevented in the greater area of the town. Treated wastewater shall be let by a submarine outfall into the Vrgadski channel, to dilute by means of a diffuser in the mass of cleaner sea water, and then the sea- and wastewater mix will be conveyed to the open sea. 2. Legal and Administration Frames The State Plan for water protection (Official gazette - NN 8/99) that is based on the Water Management Act (Zakon o vodama) (NN 107/95), includes designing and construction of public drainage systems, including plants and outfalls as measures for prevention and reducing of water pollution. Treatment degree as well as limit value of treated wastewater indicators are defined by Regulations on limit values of indicators of hazardous and other matter in waste water (NN 40/99; 06/01). The Regulations are in conformity with the Council Directive concerning urban Waste Water treatment (91/271/EEC). The planned capacity of the Plant in Biograd is: - 23.730 PE in the first construction stage - 47.460 PE in the second construction stage The Vrgadski channel, as receptor of treated wastewater of Biograd, is classified as less susceptible area (according to the Operation Manual - Safeguard policies). Art. 3, of the Regulations (NN 06/01), for stages I. and II. of the Plant construction stipulates that: the first (I.) treatment degree is necessary. Construction of the wastewater treatment plant (WWTP) in Biograd is in conformity with the Convention on the Mediterranean Sea protection from pollution, as well as with the Protocol on the Mediterranean Sea protection from pollution from the land (International treaties, NN 1/90), whose signatory is Republic of Croatia. According to The Law on Municipal Management (NN 36/95) local administration units are liable to undertake measures to preserve and protect the environment and provide for a continuous and high quality municipal services, in which, according to Art. 3, of the Law, are included "drainage and wastewater treatment ". 3. Description of Project The public drainage system of Biograd consists of: - Network of sewers collecting wastewater from consumers, - Wastewater main channels conveying wastewater from sewers to the plant, - Pump stations with pressure piping by which wastewater is pumped from lower areas to higher ones where gravity running of sewers and main channels takes place - Wastewater treatment plant, - Submarine outfall through which treated wastewater is let to the sea. General conception of the public drainage system is defined in the Preliminary Design of the Biograd Riviera wastewater drainage (Water management organization, 1990.). According to the solutions specified therein, the main wastewater channels are approximately in parallel with the coast line, at levels that enable gravity running from the settlement Sveti Petar na moru (north-west) to Drage (south-east). Parts of Biograd that are situated between the main channels and the sea shore, will be provided with separate sewer network that gravitate to the pump stations of minor sub-basins. From the pump stations wastewater will be, by means of pressure piping, conveyed to the main channels. The public wastewater system will be constructed in two stages. In the first stage a part of the system would be constructed, from Turanj (north-west) to Pakoštane (south-east). In this period the central wastewater treatment plant in area Kumenat would be constructed. Simultaneously, the submarine outfall would be constructed from the cape Dominis toward the open sea of the Vrgadski channel. The site of the outfall divides the whole public drainage system into two subsystems, i.e. the north one and the south one. In the north subsystem parts of drainage network already exist that could be connected to the main channel of the first stage. In the second stage extension of the System is planned, and this in the north subsystem, from Turanj to Sveti Petar na moru; in the south subsystem, from Pakoštane to Drage. Sites of different structures of the system are in conformity with the Physical Plan documentation. According to Regulations (NN 06/01) limit values of waste substance indicators, i.e. minimum decrease of input wastewater load for the First stage of treatment amounts as follows: Indicator Limit value Minimum decrease of input load Total suspended substance 150 mg/l 50 The Preliminary Design of drainage provides for possibility of increasing the number of drainage system users, by connecting the tourist settlement Tustice to the north Subsystem. In this case the Plant capacity would be 53.660 PE, hence, according to the Regulations, both the first and the second degree of treatment would be necessary. However, in conformity with interpretation of the State Water Protection Act, the planned treatment degree must be installed in the plant when at least 70% of total water consumers are connected. Until connecting all the 70% users, it is possible to construct a

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