23 of 74  Construction of Giresun Wastewater Treatment Plant  Tender Dossier Volume 3 Employer’s Requirements  Section 3: Plant Description  Storage Tanks  -  back pressure valve  -  emergency eye shower -  electrically driven mobile pump (chemical resistant) for emptying the bounded area -  potable water connection -  material: GRP / HDPE  -  type: double skinned (if GRP used)  -  level control/gauge  -  supply pipe with coupling and overflow pipe  -  drain with flange and isolating valve  Chemical storage system and all equipment related to chemical phosphorous precipitation shall be  installed inside a building with a frost-free condition. Building inner area shall have the heating system  to prevent the frost conditions. Inner area including all walls and floor of the building shall be isolated  with the material to maintain protection against the adverse effects of the chemical. These storage tanks shall be placed in the concrete safety tanks. These tanks shall be designed and  constructed to prevent the chemical spill. The inner volume of this concrete safety tank shall be %10  higher than the volume of the storage tank. Emergency eye shower shall be installed outside the  building and close to the entrance door of this building.  The storage tank coating will be UV resistant and color according to ISO standard for handling of  chemicals.  The requirements for dosing pumps are defined in Section 7. The properties of dosing pumps shall be  selected regarding this safety tank dimensions and level.  The capacity of storage tanks and dosing pumps shall be provided for Stage 2 requirements based on  daily average flow and assuming that only biological enhanced phosphorus removal shall take place  i.e. additional hi-tech removal will not be taken into account for capacity calculations.  Minimum number of storage tanks  : 2 units  Minimum number of chemical dosing pump  : 1 duty +1 standby unit  Minimum storage capacity of chemicals  : 30 days  The distribution chamber shall be designed, constructed and equipped regarding the requirements set  in Table 2-1.  This distribution chamber shall receive the wastewater from the anaerobic bio-phosphorus tanks and  distribute it evenly to the activated sludge tanks to be constructed. The structure shall be made of  reinforced concrete. There shall be the penstocks or valves with electric actuator accordance with the  specifications given in Section 7.8.8 and 7.8.18. The operation status of the penstocks should be  monitored and controlled by the SCADA system. Chambers designed and constructed for the needs of  3.3.4.11 Distribution Chamber for Activated Sludge Tanks  3_Vol3_d4.3_Section 3_Plant Description_GIR_rev08 