CLIENT NAME - Sarasota.WaterAtlas.org

• The chlorine and ammonia chemical feed at the Carlton WTF is not flow paced.Operators feed the chemicals manually based on residual levels and the number ofEDR units in operation. This could cause overfeeding of chemicals and requiresadditional time from operators. It is recommended that the chemical feed systems beupgraded for flow pacing. Carollo Engineers will complete further evaluation of theCarlton WTF’s chemical feed systems under a separate project with the County.• The finished water alkalinity from the Carlton WTF is relatively low compared totypical values. Low alkalinity levels generally provide less buffering capacity, whichcan lead to conditions conducive for corrosion. However, evidence of overall systemcorrosion, such as red water or high lead and copper values, are not present in theCounty’s system. Additionally, water quality compatibility with other waters in thedistribution system, such as Peace River and Manatee County, is important inmaintaining stable water in the distribution system. Carollo Engineers will completefurther evaluation of the Carlton WTF’s chemical feed systems and water qualitycompatibility under a separate project with the County.• An additional finished water ground storage tank and new high service pump stationare recommended at the Carlton WTF. Although the existing storage capacity in theCounty’s distribution system is adequate to meet the FDEP regulations for finishedwater storage, the additional storage volume would provide for additional ease ofoperation and would meet diurnal fluctuations while maintaining emergency reserveand fire flow volumes. These upgrades are planned for completion in 2007.• The Venice Gardens WTF is not equipped with a backup concentrate disposalmethod, and the deep injection well has experienced some problems in the past.Therefore, a reject transfer station is recommended. The facility is already equippedwith piping and a hydropneumatic tank to transfer brine to another deep injection wellwithin the County’s system. An onsite storage tank and pumping system to transferthe brine would provide a backup disposal option for the facility.• The old membrane system in Building 2 at Venice Gardens WTF is not operational;therefore, this asset is being underutilized. County staff stated that this portion of thefacility will be upgraded with new membranes, some chemical feed modifications, andnew instrumentation for flow, pH, and conductivity in late 2005. The five high pressurefeed pumps and motors will also be rebuilt. County staff will also consider strategiesfor obtaining higher recovery in the upgraded system.• The degasification system at the University WTF is labor intensive and often out ofservice due to maintenance requirements. An upgrade to the degasification system isrecommended.FINAL - August 31, 2005 61H:\Client\SAR Co_SAR\6873C00 WATER SUPPLY MASTER PLAN UPDATE\Deliverables\TM 2 - Water System Assets\Final\TM2 Final.doc