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<br />123~ <br /> <br /> <br />B. System Inventory Mapping. <br /> <br />The work in this section will be limited to the skeletonized model portion of <br />the collection system. This includes pipelines in the existing model database <br />plus new major pipelines installed since 1987. <br /> <br />1. Numbering System. Establish manhole and structure numbering system <br />which provides geographic and sewershed identification codes. The <br />numbering system will be cross-referenced to the existing numbering <br />system. The new identification numbers will be digitized in the map <br />prepared under Subtask 3. <br /> <br />2. Inventory Data Base. An inventory database will be created from <br />the sewer line information in the existing BVSWR model. The database <br />will include the cross-reference of the existing and new numbering <br />system. The inventory database will be compatible with the inspection <br />databases and the Intergraph graphical interface developed during <br />inspection and mapping subtasks. <br /> <br />3. Digitize Base Map and Interceptors. A digitized composite "wall" <br />map will be prepared from existing digitized base maps and from existing <br />interceptor sewer maps. The digitized base map will be in a separate <br />layer from the interceptor sewer data and will show streets, and major <br />surface features. This base map is currently available on the City's <br />Intergragh GIS. <br /> <br />~ <br /> <br />The digitized interceptor sewers will be the modeled portion of the <br />collection system only. Data layers will include the following: <br /> <br /> <br />. manhole structures and sewer lines with flow direction arrows <br /> <br />. sewersheds and subsystems <br />. identification numbers <br /> <br />. pipe diameter, slope and length. <br />, <br /> <br />The purpose of the map is to show the interceptor system in sufficient <br />detail for planning and routine maintenance purposes only. Location of <br />manholes and structures with respect to streets, rights-of-way, and <br />other structures will be approximate only. <br /> <br />The digitized base map and interceptors will be provided in Intergraph <br />format. The model and databases developed as part of this project will <br />be graphically connected to the digitized interceptor sewers. <br /> <br />4. Selective Field Investigation. Selective field checks will be <br />performed to gain an understanding of questionable routing patterns and <br />collection system configuration. <br /> <br />5. Establish and Verify Flow Monitoring Points. A field review of the <br />metering sites will confirm accessibility and the adequacy of the sites <br />from a hydraulic and engineering standpoint. Each proposed metering <br />site will be inspected to ensure wastewater flow rates can be accurately <br />recorded. Minor debris or sediment that would influence the <br /> <br />06/02/93 <br /> <br />A-7 <br /> <br />