## 1.3.7 Receiving Body 

The treated wastewater from the wastewater treatment plant shall be discharged into Black Sea. 

Regarding to “Urban Wastewater Treatment Regulation, Communiqué on Sensitive and Less Sensitive Water”, receiving body where the wastewater of Giresun is discharged is classified as “grey area”. Most of the cities at East Blacksea Region have difficulties to find the area for WWTP due to topographical reason and high settlement density on coast. Regarding these aspects, the pretreatment and deep sea outfall facilities have been still implemented by IlBank and several institutes. 

Giresun is in the East Black Sea Basin. For wastewater treatment, the nitrogen and phosphorus removal are proposed as necessary precautions for Giresun-Centre in Annex 7- Table 12 of the Regulation . The aim of this Regulation is to identify vulnerable water bodies and their sensitive urban and nitrate sensitive areas in terms of their nutrient elements, to establish the principles and bases concerned, and to determine the necessary precautions to be taken to improve water quality in sensitive water bodies. 

Furthermore, for Giresun WWTP, the letter of the MoEU stated that “In the case of using the receiving body of mentioned area for swimming purpose, the advanced treatment and disinfection/deep sea outfall are required”. 

The wastewater treatment plant shall be designed and constructed to comply with the discharge effluent criteria set out in EU Urban Wastewater Treatment Directive (91/271/EEC), Turkish Water Pollution Control Regulation 1 Urban Wastewater Treatment Regulation$^{2}$, Urban Wastewater Treatment Regulation, Communiqué on Sensitive and Less Sensitive Water Areas $^{3}$and Regulation on Identifying Sensitive Water Bodies and Areas Affecting These Bodies and Improving Water Quality$^{4}$. 

## 1.4 Surveys 

## 1.4.1 Topographical surveys 

A topographic survey of the wastewater treatment plant site was carried out in March 2017. 

The Contractor shall familiarise himself with the site conditions before submitting his tender. This survey is given only for information purpose. The Contractor shall conduct a new topographical survey for his design works. 

## 1.4.2 Geotechnical investigations 

A geological and geotechnical survey was carried out in March 2017. The survey report is provided in Volume 5. 

In the scope of this survey drilling at a total of 140.00 m depth in 7 locations in the Wastewater Treatment Plant site and a total of 8.50 m deep 5 pits were drilled. In 5 drilling wells, there are current alluviums on the top, just below the unqualified fill. In the other two wells, the alluvial floor under unqualified fill and limestone just below it are observed. In the research pits opened, the current alluvium was observed in the one and unqualified filling was observed in all other pits. The ground water level was observed at 4.0 m depth. 

