## 3 Plant Description 

## 3.1 Layout Considerations 

Giresun Municipality stated that approximately 2.2 ha area in Batlama region was determined as wastewater treatment plant area. Existing elevations of plant area change between 5.00 and 25.00 m. The available surface area is approximately 2.2 ha. 

In order to provide gravitational transmission between the units in the plant, it is necessary to apply pumping at the inlet. Wastewater taken from the new collector to be built within the other Work Contract in the scope of the IPA packages is designed to be ended in the inlet structure to be constructed in the WWTP site. 

The required head of the pumps shall be determined according to the BOPEL (bottom elevation of pipeline) of the main collector with 1000 mm diameter as -1.94 masl and the WWTP inlet structure water level. The WWTP inlet structure water level is calculated by taking account the head loss through the treatment plant and the site elevation. 

Site elevation changes between 5-25 m in that part and approximately 2 ha part remains in the flat area. The retaining wall shall be constructedin order to maintain safety both during construction and operation of the plant. The approximate required length of the retaining is 300 m length which is shown on the conceptual design general layout drawing given in Volume 5. 

A conceptual layout of the proposed wastewater treatment plant is presented in Volume 5. This layout is given just for information purpose. The layout to be implemented by the Contractor shall be the responsibility of him. The tenderer is free to design and location of all units targeting the optimization of the construction and operational works. 

There is very high topographic slope at the south-west part of the plant area. In order to increase stability and work-labor safety in this area; the geotechnical precautions such as floor nails, steel mesh, retaining walls, shotcrete etc. are recommended as a result of the geotechnical survey. The methodology of excavation and the geotechnical precautions are subject to the Engineer’s approval. The Contractor shall prepare the methodology of excavation, the plant units excavation application projects-geotechnical projects and preparation of required excavation as stated in the methodology of excavation.These projects are subject to the Engineer’s approval. 

All structure design and construction shall be appropriate to the limited plant area. The compact units shall be designed regarding both constructional and operational phase. 

Tanks and other process structures shall be constructed in accordance with the hydraulic profile avoiding any unnecessary pumping in the process. Pipes shall either be buried or located inside buildings and tanks or be arranged in a way that does not disfigure the desired neutral appearance of the plant. Moreover, to the extent possible, all equipment shall be installed in buildings for aesthetical reasons and to reduce noise to a minimum. Specific requirements for structures, buildings, architecture and landscaping are also given in the Employer’s Requirements, Sections 9 and 10. 

