02-28-2019
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EXECUTIVE DIRECTOR CONTRACTING RECOMMENDATION <br />2 ED_CONTRACTINGRECOMMENDATIONFORM_HMG_TO25-A2_2019-0125 <br />Financial Considerations: <br />Amendment 2 to Task Order No. 25 adds Subtask 2.A Phase 9 Model Update scope and budget, and extends the <br />POP to December 31, 2019. This task order is billed on a time and materials basis, and only incurred costs are <br />invoiced. The detailed draft task order scope is attached. <br />HMG provided the attached cost proposal and the PMC has reviewed it. The labor rates are consistent with 2018 <br />MSA allowed rates. Below is a summary of the review. <br />1. Subtask 2.A: Phase 9 Model Update <br />a. 2.A.1: Southern Embankment and Associated Infrastructure (SEAI) Phase 9 Geometry Updates <br />i. General Scope of Work: As part of the Phase 9 modeling, HMG will update to the HEC‐RAS <br />hydraulic model to incorporate geometry changes to the project that were part of the <br />Plan B recommendations. <br />ii. For this amendment, HMG is requesting additional budget to complete the 2D modeling <br />mesh, evaluate the area 1 mile upstream of the Diversion Inlet Structure, and incorporate <br />the results into the unsteady flow model. <br />1. HMG’s cost proposal for additional subtask 2.A.1 work is $75,936 and includes <br />392 hours of professional services at an hourly rate of approximately $195 per <br />hour. <br />b. 2.A.2: Diversion Channel and Associated Infrastructure (DCAI) Phase 9 Geometry Updates <br />i. General Scope of Work: As part of the Phase 9 modeling, HMG will prepare an update to <br />the HEC‐RAS hydraulic model to incorporate geometry changes to the DCAI since the <br />previous model update. <br />ii. For this amendment, HMG is requesting additional budget to add bridges at 32nd and 52nd <br />Ave. South, incorporate the realigned Drain 14, and re‐size drain inlets in the model. <br />1. HMG’s cost proposal for additional subtask 2.A.2 work is $11,136 and includes 60 <br />hours of professional services at an hourly rate of approximately $185 per hour. <br />c. 2.A.3: With‐Project Phase 9 Model Run Updates <br />i. General Scope of Work: HMG will conduct HEC‐RAS hydraulic model runs of the Phase 9 <br />with‐project geometry for the following flood events: Red River Peak 10, 20, 25, 50, 100, <br />and 500‐year events and Tributary Peak 10, 25, 50, 100 and 500‐year events. They will <br />also verify duration impacts and make subsequent updates, and conduct floodplain <br />mapping for these events. <br />ii. For this amendment, HMG is requesting additional budget: <br />1. To update the unsteady flow model, generate the Red River and Tributary peak <br />flood events, and conduct floodplain, depth difference, and flood duration <br />mapping for these events. <br />a. HMG’s cost proposal for this additional subtask 2.A.3 work is assumed to <br />be half of their proposed work under Task 6, see attached HMG cost <br />proposal. This is $6,084 and includes 34 hours of professional services at <br />an hourly rate of approximately $179 per hour.
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