02-28-2019
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EXECUTIVE DIRECTOR CONTRACTING RECOMMENDATION <br /> <br />ED_CONTRACTINGRECOMMENDATIONFORM_HMG_TO25-A2_2019-0125 3 <br />2. To evaluate flood duration impacts, due to modifications to borrow ditches, dam <br />embankment road crossings, the connecting channel, and weir structures. <br />a. HMG’s cost proposal for this additional subtask 2.A.3 work is $75,936 <br />includes 392 hours of professional services at an hourly rate of <br />approximately $195 per hour. <br />d. 2.A.4: Existing Conditions Phase 9 Model Run Updates <br />i. General Scope of Work: HMG will develop HEC‐RAS hydraulic model runs of the Phase 9 <br />existing conditions geometry for the Red River Peak 20‐year flood event and the Tributary <br />Peak 25‐year flood event, evaluate hydrographs, revise the model if necessary, and <br />conduct floodplain mapping. <br />ii. For this amendment, HMG is requesting additional budget to rerun the existing conditions <br />modeling and mapping. <br />1. HMG’s cost proposal for additional subtask 2.A.4 work is $12,168 and includes 68 <br />hours of professional services at an hourly rate of approximately $179 per hour. <br />e. 2.A.5: Phase 9 Extreme Event Analysis <br />i. General Scope of Work: Using the Phase 9 HEC‐RAS model, HMG will evaluate the Inflow <br />Design Event (IDF) and the Probable Maximum Flood (PMF) events, including the Western <br />Tieback length and elevations, Interstate 29 road raise and bridge crossing, Eastern <br />Tieback location, length and elevation. <br />ii. For this amendment, HMG is requesting additional budget to evaluate the PMF event. <br />1. HMG’s cost proposal for this additional subtask 2.A.3 work is assumed to be half <br />of their proposed work under Task 6, see attached HMG cost proposal. This is <br />$6,084 and includes 34 hours of professional services at an hourly rate of <br />approximately $179 per hour. <br />f. 2.A.7: Phase 9 QA/QC <br />i. General Scope of Work: HMG will conduct a QA/QC review of the Phase 9 unsteady HEC‐ <br />RAS model. <br />ii. For this amendment, HMG is requesting additional budget to perform QA/QC on the <br />Phase 9 modeling work. <br />1. HMG’s cost proposal for additional subtask 2.A.7 work is $7,472 and includes 36 <br />hours of professional services at an hourly rate of approximately $210 per hour. <br />2. Time Extension <br />a. The Phase 9 modeling work has not been completed and work is continuing into 2019. This <br />amendment extends the POP to December 31, 2019. <br />
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