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- back pressure valve 

- emergency eye shower 

- electrically driven mobile pump (chemical resistant) for emptying the bounded area 

- potable water connection 

Storage Tanks 

- 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. 

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## 3.3.4.11 Distribution Chamber for Activated Sludge Tanks 

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 

