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chlorine (10.5%) is added at the beginning of the chlorine contact tank/clearwell andis used to meet primary disinfection requirements. Chlorine can also be added to thechemical scrubbers to help with odor control.• Ammonia - Liquid ammonia (18%) is added to the end of the clearwell to allow theformation of chloramines for residual disinfection. The typical chlorine to ammoniaratio target is approximately 5 to 1. The target residual concentration is 3.5 to 4.0mg/L.The chemical storage areas are located throughout the WTF site with all bulk storage tanks,aside from sodium hypochlorite, stored outdoors and the day tanks and chemical feedpumps stored in individual rooms. Sodium hypochlorite is stored in and fed from two bulkstorage tanks located in an enclosed room. Liquid ammonia is stored in and fed from totesthat are housed in a covered outdoor area in the location of the original tray aerator system.The bulk sulfuric acid tank is located outside of Building 1, while the acid day tank andantiscalant totes and tank are stored inside of the building. In the upgrade to Building 2,new anti-scalant chemical feed equipment will be installed. A new acid feed system alsowill be installed, if necessary. Chemical storage tank information is presented in Table 2.5.Table 2.5Venice Gardens WTF Chemical Storage FacilitiesChemicalNumber ofTanksTank Volume(gal)Total Volume(gal)Sulfuric Acid 1 4,500 4,500Sodium Hypochlorite 2 850 1,700NotesBulk tank. Fed from250-gal day tank.Fed from bulktanks.Ammonia Hydroxide 2 330 660 Stored in totes.AF-600 (Anti-scalant) 1 100 100Day tank filled from55-gallon drums.Sodium hypochlorite and ammonia are fed in a manual mode, due to the facility’s currentlow flow. The flow meter used to flow pace these chemicals is not accurate at the currentflowrates, so these chemicals must be fed manually. However, the capability to flow pacethese chemicals will be available when the facility’s flow increases. The pretreatmentchemicals, sulfuric acid and AF-600 anti-scalant, are fed via flow-pacing.FINAL - August 31, 2005 30H:\Client\SAR Co_SAR\6873C00 WATER SUPPLY MASTER PLAN UPDATE\Deliverables\TM 2 - Water System Assets\Final\TM2 Final.doc