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Scope of Services <br /> Continued <br /> 7326 Boston Harbor Road NE <br /> Engineering Consultants,Inc. Olympia, 45A 98506 <br /> �, g $ (360)570-3450 <br /> www.mgsengr.com <br /> COST ESTIMATE <br /> Project: Engineering Support to OTAK for Precipitation Input for.Hydrologic/Hydraulic <br /> Model used to Analyze City ofEverett Combined Sewer <br /> Task 1: Quality Check Precipitation inputs for SWMM Model <br /> Precipitation collected by the City of Everett at a time step of 10-minutes will be used to <br /> perform long-term simulations using the SWMM model to identify capacity issues in the <br /> Everett combined sewer. Work under this task will involve analyzing the precipitation time <br /> series for completeness and quality checking it to ensure there are no erroneous precipitation <br /> values, and correcting these values. <br /> Ten-minute time step precipitation data collected by the City of Everett will be provided to <br /> MGS Engineering by OTAK along with hourly data collected at the Everett long-term gage. <br /> The ten-minute data is approximately 10-years in length and will be used as input to the <br /> SWMM model to assess combined sewer capacity issues. The two datasets will be compared <br /> to identify periods of missing rainfall and data from the hourly record will be used to fill in <br /> any missing periods in the 10-minute record. Annual maximum statistics will be computed <br /> for the ten-minute record for durations of 10-minutes,30-minutes, 60-minutes,2-hours, 6- <br /> hours, 24-hours, 72-hours, 10-day, 30-day, 90-day,and annual and compared with regional <br /> statistics. This will allow anomalously high (or low) precipitation periods to be identified and <br /> corrected, and to determine whether the record is representative of the climatic conditions at <br /> Everett. <br /> Deliverables: Quality checked precipitation time series with missing periods filled in and <br /> erroneous data corrected suitable for long term simulation in SWMM model. Technical <br /> memorandum documenting the approach used to check the time series along with <br /> precipitation magnitude-frequency statistics at each duration. <br /> Hours Rate Amount <br /> Bruce Barker,P.E. 32 $125.00 $4,000.00 <br /> Mel Schaefer,P.E. 2 $135.00 $ 270.00 <br /> 34 $4,270.00 <br /> City of Everett—North Everett Combined Sewer System Evaluation 11 <br /> otak <br /> IC:\project\31500\31520\Contract\Amendll_NAreaFlooding\31520 Everett SetaAmendment 1 Scope082S10.doc <br />