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Home My WebLink AboutWORK ORDER - RFP - 7084 CONSULTING ENGINEERING SERVICES (24)EXHIBIT "A" WORK ORDER FORM PURSUANT TO AN AGREEMENT BETWEEN THE CITY OF FORT COLLINS AND AYRES ASSOCIATES DATED: Work Order Date: January 16, 2013 Work Order Number: SCP-DCEVD-011613 Purchase Order Number: i130 4 G lv Project Title: Dry Creek NECCO Hydraulic Model Refinement Commencement Date: January 22, 2013 Completion Date: July 31, 2013 Maximum Fee: (time and reimbursable direct costs): $24.410 Project Description: update and continuation of the hydraulic modeling done for the Northeast College Corridor Outfall project including analysis of ponding on north side of E Vine Drive and along Dry Creek. Scope of Services: see attached scope Service Provider agrees to perform the services identified above and on the attached forms in accordance with the terms and conditions contained herein and in the Services Agreement between the parties. In the event of a conflict between or ambiguity in the terms of the Services Agreement and this work order (including the attached forms) the Services Agreement shall control. The attached forms consisting of two Exhibits 4 pages) are hereby accepted and incorporated herein by this reference, and Notice to Proceed is hereby given. Service Provider By: Title: Date: City of Fort Collins: Submitted By: Special ect Manager Date: Reviewed By: 6ylLh�=4 0� Chief Engineer Date: Reviewed By: G� Water Engineering & Operations Mgr. Date:_ Approved By: Approved By: Utilities General Manager Dir. of Purchasing & Risk Management Date: CC: Purchasing December 18, 2012 EXHIBIT A VINE DRIVE STORAGE ADDITIONAL ANALYSIS PROJECT OBJECTIVE: During the design and modeling of the NECCO regional detention pond, Ayres and City staff became aware of the deficiencies of the current HEC-RAS modeling of the flood storage area north of Vine Drive, on the Kederike property. The current modeling has only been done with steady state HEC-RAS. In order to determine the actual water surface elevation an un-steady HEC-RAS or EPA SWMM model should be used to model the flood storage. In addition, since the time of the original NECCO design the North College project from Vine to Hickory was completed and the Dry Creek ModSWMM model was updated. GENERAL This scope covers the continuation of the modeling that was done for the NECCO Alternative Analysis project by Ayres Associates. The summary memorandum that was done for that work was dated January 26, 2010. This scope allows time to obtain accurate survey data for the existing culverts under Vine Drive (appears to be one 24" and one 12" culvert), the existing culverts under the railroad (appears to be 4-48" culverts), the existing box culverts under Vine Drive and the soon to be cleared out areas upstream and downstream of Vine Drive and the railroad. The more accurate survey data will be used to update the HEC-RAS model of Dry Creek. Also, the latest ModSWMM Model that was developed with the North College project will be used for this analysis. The Ayres Project Manager will be: Andrea Faucett (223-5556) office (556-2525) cell The Ayres Project Engineer will be: Jaclyn Michaelsen (223-5556) office (310-1547) cell TASK 1 — MEETINGS and DATA COLLECTION 1.1 Kick-off Meeting. Ayres and the COFC will hold a kick-off meeting to insure that Ayres is heading in the correct direction with the modeling effort. The COFC project manager Sue Paquette will be in attendance. Ayres will prepare meeting minutes to document the discussion and distribute for comment and feedback. 1.2 Survey Data. Our understanding is City of Fort Collins (COFC) maintenance crew will be performing the following work: • Clearing out the existing (6) box culverts under Vine • Clearing out the existing 24" and 12" culverts under Vine • Create a channel from the south (downstream) side of the Vine,Drive boxes to the upstream or north side of the railroad culverts • Clearing out the area on the south (downstream) -side of the railroad culverts and creating a channel within the COFC property Once the work has been completed by the COFC maintenance crew, Ayres will be performing the following survey tasks: ___•___Survey--upstream-and-downstream inverts -of -box -culverts under -Vine - Drive • Survey several cross sections on north (upstream) side of Vine Drive • Survey inverts of two existing (24" and 12") culverts under Vine • Survey cleared out channel between south (downstream) side of the Vine Drive boxes and the north (upstream) side of the railroad culverts December 18, 2012 • Survey upstream and downstream inverts of railroad culverts • Survey cleared out area on south (downstream) side of railroad culverts In addition, during the Alternative Analysis phase of the NECCO design the existing Lemay Avenue box culvert was cleaned out and surveyed. That information was included in the model, however additional survey is still needed upstream to more accurately model the flow through the culvert. Assumptions were made for the geometry of the channel just upstream of the crossing. This scope will allow time for accurate survey information to be obtained. In addition, this allows a small amount of time for any additional survey that might be needed on the Kederike property or elsewhere. 1.3 Progress Meetings. This scope assumes that minimal progress meetings will be required and that during the course of this analysis communication can be accomplished through regular phone conversations and the occasional "stop over" visit by the Project Manager (Sue Paquette) to the Ayres office. However, some time has been accounted for to allow this to occur. TASK 2 — VINE DRIVE FLOOD STORAGE ANALYSIS 2.1 Verify Hydrology. During the course of the North College design, a more accurate hydrologic model (ModSWMM) of the north college area was developed. This work was done after the NECCO Alternative Analysis, so Ayres will need to insure the latest ModSWMM model results are used for this analysis. 2.2 Unsteady HEC-RAS Model of Flood Storage Area north of Vine. This task includes time to develop an unsteady HEC-RAS model of the flood storage that is occurring on the north side of Vine Drive. This model will more accurately determine the 100-year water surface elevation and base flood elevation (BFE) for this area. The modeling of this flood storage area will assume the following: 1. The 2 culverts (24" and 12") are cleaned out under Vine and the 6 box culverts under Vine are also cleaned out. 2. The channel is constructed which connects the downstream side of the 6 box culverts with the 4-48" culverts under the railroad 3. The area downstream of the railroad is cleared out within the COFC property 4. New railroad bridge is not in place 2.3 Offline calculation in EPA SWMM. In order to verify the results of the unsteady HEC- RAS model in Task 2.2, an off-line EPA SWMM model will be developed for the same area. The results of the EPA SWMM model should match fairly consistently with the results of the unsteady HEC-RAS model giving confidence in the results. 2.4 Grade ponding area within Kederike Property. If the results of Tasks 2.2 and 2.3 _— —___show that_the 1.00_year_base_flood_elevation_for the pond extends outside of the Kederike property boundary then some grading within the Kederike property will be required. This task includes time to re -run the modeling and revise the BFE mapping. This task will not be required if the ponding area stays within the Kederike property boundary. 'ra December 18, 2012 2.5 Re -Mapping of existing 100-year Dry Creek Floodplain. With the inclusion of the updated hydrology, cleaning out and re -modeling the existing culverts, new survey data for the area and the unsteady HEC-RAS model of the flood storage area, it is likely that the floodplain limits will change. Ayres will provide an updated 100-year existing condition floodplain exhibit to reflect the modeling adjustments, that will either reflect the base flood elevation determined in Tasks 2.2 and 2.3 or the "with grading" elevation determined in Task 2.4. 2.6 Prepare short Technical Memorandum describing modeling results. Ayres will develop a technical memorandum which describes the additional data collection, modeling methodologies, results and updated mapping. 3 Ayres Associates - Professional Services Fee Proposal Vine Drive Storage Additional Analysis ASSOCIATE' Based on Scope of Services dated 11/28/2012 A Cno RCTAu Aura e. Task — "-- - -- • • ••_ • ••-••• �•+.•..•..-.... Vr LIIRCI.1 ^11u aUat,UrvaUL I INN GU515 13Y TASK DescriptionTotal Lzroor .2 Cost Direct Costs Total by Task Total by Task in Etas 5125 5125 5150 $ay S75 A55 1.1 Kick-off meeting 2 2 2 $ 690 715 S1715L2 Survey data4 8 24 r$25 $5.100 5,100 $1.3 Prog;ess Meetings 812 $2.820 2,820 $��o� Vine Drive Flood Storage Analysis 10188 24 2 4 6810 8,635 S Task. 2 2.t 1 edfy hydrology 2 2 nsteadyHEC-RAS model o(flood Storage area north ofine b 250 $ 250 b 250 7-7 $ 4.000 $ 4,000 $ 4,000 2.3 Offline calWation in EPA SWMM - $ 2,000 $ 2.000 $ 2,000 24 Grade pending area vAthn Kededke property 2 16 12 4 3,350 $ 3.350 S 3,350 2.5 Re pping of existing 100-year Dry Creek floodplain g 72 $ 2,020 $ 2.020 S 2.020 2.6 Prepare ShW technical memo 6 20 $ 4,155 2 2 $ 4,140 $ 15 $ 4,155 Subtotal - 10 94 26 2 $ 15,760 $ $ 15.775 $ 15,775 I. "Total 20 112 a 24 26 2 2 $ 24,370 $ 25 $ 7A.410 1 $ 24,410 EXHIBIT B