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and how it is operated. This information can then contribute to an understanding of existingor potential infrastructure constraints, water quality concerns, and future projects. Thisinformation was derived from a series of interviews with operations personnel, as well asinternal knowledge gained during previous projects. Appendix F contains field notes andminutes from interviews with County distribution system staff.The major goals of water distribution to achieve safe, reliable water include:• Minimize the total water purchase, treatment, and delivery cost.• Provide the best quality, safest water possible that meets or exceeds all regulations.• Provide customer service by preventing disruption of water delivery, meeting fire flowrequirements, and maintaining sufficient pressures within the distribution system.In general, two major areas supply the County: Manatee County and University Wellfieldfrom the north and Carlton and Peace River from the southeast. The Venice Gardens WTFalso supplies a small area of the County. Due to the history of changes in the County andthe way it operates its distribution system, several system assets are underutilized. Inaddition, due to the variety of water sources, water quality issues arise in areas receivingmixed sources. Portions of the central areas of the County receive a “mix” of waters, soensuring a compatible disinfection and corrosion control program is essential.Although this WSMPU will document existing water system infrastructure, hydraulicmodeling is not part of this project scope. A hydraulic water distribution system model isbeing developed concurrently with this project under a different County project. Hydraulicmodeling will provide specific information on the need, location, and size of new waterdistribution mains, as well as the need for storage and pumping facilities in specificlocations. In order to incorporate the need for additional water system infrastructure, theWSMPU project team will integrate results of the hydraulic modeling when developing theCIP at the end of the project.2.4.1 Distribution System Transmission MainsThe County has a large water transmission system, consisting of mains from 4 to 42 inchesin diameter. Large transmission mains (18-inch and greater) are usually ductile iron pipe,although a few large PVC pipes have been installed. Smaller transmission lines aretypically constructed from PVC. Transmission pipes for sizes 12 inches and greater areshown in Figure 2.12. It should be noted that some new areas of the water system mightnot appear on the map in Figure 2.12.FINAL - August 31, 2005 42H:\Client\SAR Co_SAR\6873C00 WATER SUPPLY MASTER PLAN UPDATE\Deliverables\TM 2 - Water System Assets\Final\TM2 Final.doc