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24. The Contractor shall successfully complete a conductivity test of the installed tracer wire system prior to final acceptance. 25. Directionally drilled pipe shall have 2 tracer wires installed on opposite sides of the pipe with the pipe. Wires shall be securely taped to the pipe barrel every 20 feet. 26. The Contractor shall perform a conductivity test within one week of completion of pressure testing of the main on all iron pipe watermains to establish that electrical thawing may be carried out in the future. A conductivity test shall be completed on the tracer wire system installed with PVC or HDPE pipe watermains. The system (pipeline, valves, fittings and hydrants) shall be tested for electrical continuity and current capacity. The electrical test shall be made after the hydrostatic pressure test and while the line is at normal operating pressure. Backfilling shall have been completed. Direct current of 350 amperes +/- 10% shall be passed through the pipeline for five minutes. Current flow through the pipe shall be measured continuously on a suitable ammeter and shall remain steady without interruption or excessive fluctuation throughout the five-minute test period. Insufficient current or intermittent current or arcing, indicated by large fluctuation of the ammeter needle, shall be evidence of defective contact in the pipeline. The cause shall be isolated and corrected. Thereafter, the section in which the defective test occurred shall be retested as a unit and shall meet the requirements. 27. City requires contractor to follow AWWA C651 - Disinfecting Water Mains (Tablet method). A STORM SEWER 1. Stormwater plans for the development shall utilize as a guide the Comprehensive Surface Water Management Plan (CS WMP) for the City of Roseville. 2. Stormwater management plans shall use a 10 -year frequency storm for pipe design and a 100 -year frequency storm for ponding detention basin design. 3. Stormwater management plans shall use design criteria utilizing a hydrograph method based on sound hydrologic theory to analyze the stormwater runoff and proposed development such as the Soil Conservation Service TR -55 Urban Hydrology for Small Watersheds. 4. Drainage calculations shall be submitted to show the sizing of pipe, ponds, and emergency overflow spillways. Pond calculations should analyze a 2 -year, 10 -year and 100 -year frequency, 24-hour storm event using a modeling program such as HydroCAD or approved alternative. Any assumption used in the design should be included with the calculations. Stormwater ponds shall be designed and constructed in accordance with the City's CSWMP using criteria from the National Urban Runoff