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Home My WebLink AboutCHANGE ORDER - RFP - P1044 CONSULTING ENGINEERING SERVICES (3)40 1212101_20rz, CHANGE ORDER NO.1 PROJECT TITLE: West Vine Basin Hydraulic Analysis and Floodplain Update CONTRACTOR: Icon Engineering, Inc. 56Y0g52100 • Sd I t e70 -a, PROJECT NUMBER: PO Number 9116739 and PO Number 9112597 PURCHASE ORDER NO.: MKK-2011-01 DESCRIPTION: Additional out of scope work performed by the Consultant including evaluation new flow paths and incorporating additional topography 1. Reason for Change: 2. Description of Change: 3. Change in Contract Cost: 4. Change in Contract Time: See attached explanation See attached explanation $12,830 1 month ORIGINAL CONTRACT COST TOTAL APPROVED CHANGE ORDERS TOTAL PENDING CHANGE ORDERS TOTAL THIS CHANGE ORDER ADJUSTED CONTRACT COST (Assuming all change orders approved) ACCEPTED BY:'� $34,280 & $29,075 = $63,355 $0 $0 $12,830 $76,185 DATE: /Z/% /Z Consultants Representative ACCEPTED BY: DATE A ?- City of Fo Collins Project anager APPROVED BY: S DATE: Z 13 Z Titre: STORMWATER/FLO D IN PROG MGR APPROVED BY: cc: Purchasing G6jrsa # DATE: Purchasing Agent over $60,000 504. 5 04 MG 7-900.5ti113o. 2 ENGINEERING, INC. 6100 5. Akron 5treet, 5uite 500, Centennial, CO 8011C - Phone (505) CEI-080E / Fax (505)-221-1019 Planning b JO_ w Design Management May 29, 2012 Mr. Mark Kempton, PE., CFM Stormwater Master Planning Manager City of Fort Collins Utilities P.O. Box 580, 700 Wood Street Fort Collins, CO 80522-0580 RE: West Vine Basin — Hydraulic Analysis Change order Request Dear Mark, As we had discussed previously, we have assembled this change order request letter outlining additional fees associated with the West Vine Basin Hydraulic Analysis. This request has been broken up into two parts. The first part reflects fees associated with new modeling requested by the City, including "with -and -without levee" (berm) analyses and new flow paths within the Hollywood/Irish areas. The second part reflects additional costs that were incurred during the original translation and incorporation of the County's 1-foot contour mapping, breaklines, and survey data as well as the topographic adjustments and rework at the City's Fleet Services Area. Our request is outlined in detail below: New Project Items: 1. "With and Without Levee" Analyses — "Without levee" (berm) analyses will be conducted for the Eastern Flowpath, adjacent to the Fleet Services Center and the Central Flowpath in the vicinity of the Hollywood Irish Subdivision. Hydraulic analyses will be completed to identify the flooding effects and associated base flood elevations (BFEs) or shallow flooding, from removal of the levee/berm areas. In general, the levee/berms will be removed from the hydraulic models and replaced with lateral structures. Depths of residual flooding will be estimated using "normal depth" analyses or an extension of the HEC-RAS model. 2. Hollywood/Irish Updates —The following updates will be made to the hydraulic modeling in the HollywoodArish area based on the initial results from the City's survey and intersection analysis at Sunrise & Cherry Streets. a. The intersection at Sunrise and Cherry Streets will be evaluated to determine the ratio of flow splits to the detention pond versus east along Cherry Street. Flow splits will be estimated using "normal depth" computations. b. The existing MODSWMM model will be adjusted to reflect the results of the Sunrise and Cherry Streets intersection analysis. c. Pending final results, it is assumed that an additional Fowpath down Cherry Street will be defined from Sunrise Street to the NMD. This flow path will be analyzed using HEC-RAS. A floodway will not be computed for this reach. Additionally, the analysis will be based on surface flow flooding and will not include evaluation of the existing storm sewer system along Cherry Street, which is initially fed by the detention pond release. d. The geometry of the existing overflow channel south and east of the subdivision will be incorporated into the modeling based on the City's survey. It should be noted that the eastern channel alignment varies horizontally from the design location and will require adjustment to the cross-section alignment and layout to correct this. Past Project Items: 3. Incorporation of County's 1-foot contour mapping: Larimer County's 1-foot contour mapping and field survey was incorporated into the project mapping for use in this study. The data was generally CAD based and varied in information throughout the boundary. An iterative process was used to assemble the data into a useable GIS format & projection and combine it with the remaining topographic data from the City's information. In general the process included: Coordination and adjustments regarding projection (still unknown); contour and breakline definition, and inclusion of "as -built" survey points defined on CAD layers. 4. As a result of Task 3 above, the hydraulic cross -sections along flowpaths east of the LCC2 needed to be redefined based on the updated DTM for conformity and consistency with the new mapping. 5. It was determined that the topography along the Eastern Flowpath in the vicinity of the City's Fleet Services Center was inadequate. Through coordination with the City, the modeling was reworked several times in this area. Iterations included: a. Adjustments based on the City's current topography following the original URS alignment b. Adjustments based on existing building configuration c. Topographic adjustments (i.e. digitizing design plans) and redefinition of the flow path. Fees requested for this change order are $12,830. A cost estimation spreadsheet is attached. Now that the direction for the Hollywood/Irish areas have been clarified, we estimate that this phase of the project, and DRAFT report section will be submitted towards the end of June. Thank you very much for your consideration. Sincerely, ICON Engineering, Inc. �J Craig D. Jacobson, P.E., CFM Associate EIL ICON ENGINEERING, INC. PROJECT ESTIMATING SHEET PROJECT NAME: won wns Bseln . Hyenulle MaENIRV AddldwM Irome CLIENT. CITYOFPORr COUINS-Mart Nempf PREPAREDBY. CW Ptlnelpel prolesl n l PIMeOIerM Enplm r Ce"GIS AUmin ProIoC Survey m1w. CNECNED BY. Cal Enpinser 11 EnpinnrI III Daeipner Sunsyor Crow 01,M DA rE. WW2 $150 Sim Sim SIM rs2 M 575 314r CPeb Desc Ion MPWe HOMe Hwro Hour Houn Hwm Houro Houro TOTALS New Project Items 1 "With & Without Levee Analyses" Reaches a. Eastern Flowpath - Reach 2 (FC Fleet Services) 2 6 $980 b. Hollywood Irish Berm Area 2 8 $1,220 2 Hollywood / Irish -Updates and New Items a. Sunrise/Cherry Street Intersection Analysis 2 3 $620 b. Hydrologic Modeling Adjustments and Documentation 1 2 $370 c. Cherry Street Flowpath to NMD 1 6 $850 d. Update Overflow Channel Hydraulics per COFC Survey "As-bullts" 1 2 8 6 $1,702 Past Items Completed Out of Scope 3 Incorporation of County 1-foot Contour mapping a. Projection coordination 2 2 6 $992 b. Breakline definition (where available) 1 4 4 $938 c. Detailed County Survey (In areas) 1 4 6 $1,102 4 Reprocessing of Past Cross -sections per 1-foot Contour Mapping a. Southeastern, Central, Southwestern, and Eastern Flow Paths, east of LCC2 2 12 $1,700 5 Rework of Eastern Flow Path at COFC Fleet Services a. Updated Hydraulic Analysis based on spill Flows & City's topo 1 6 $850 b. Digitize Fleet Services tope, Update spill flow hydraulic analysis 1 6 6 $1,506 0 17 61 8 30 0 0 0 0 $12830 $0 $2210 $7320 $840 $2460 $0 $0 $0 $0 $12930