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ST9905-AG010213- 1 T N E C 1 T Y O F -++r CO~PELL ~ AGENDA RE _UEST FORM ST~~-off ~~ ~ o~ ~ x ,, s a q .CITY COUNCIL MEETING: February 13, 2001 ITEM # 1 ~ ~~ ITEM CAPTION: Consider approval of entering into a contract with TranSystems Corporation for the design of Bethel Road from Freeport Parkway to west city limits in an amount not to exceed $499,569.00; and authorizing the City Manager to sign. See attached memo. SUBMITTE Y: Kenneth M. Griffin, P.E. TITL Director of Engineerin blic Works STAFF CO BUDGET AMT. $ AMT. EST. $ FINANCIAL COMMENTS: FIN. REVIEW Funds are available in the 2000 Street CIP Account for this project. DIR. INITIALS: Agenda Request Form -Revised 5/00 ~ ~G ~..--ate`( ~~ APPROVED CITY OUNCIL DATE - -~ +\-BID $ CITY MANAGER REVIEW: Y Document Name: #eng3 a/a //o/ ,.-. MEMORANDUM FROM THE DEPARTMENT OF ENGINEERING To: Mayor and City Council Members From: Kenneth M. Griffin, P.E., Dir. of Engineering/Public Works i~j Date: February 13, 2001 RE: Consider approval of entering into a contract with TranSystems Corporation for the design of Bethel Road from Freeport Parkway to the west city limits in an amount not to exceed $499,569.00; and authorizing the City Manager to sign. In November 1999 Coppell voters approved a bond program which included the construction of several roadways within the City of Coppell. Over the last few months staff has been meeting with various engineering firms concerning design contracts for West Sandy Lake Road, Coppell Road and Bethel Road. On December 12, 2000 Council approved a contract for the design of West Sandy Lake Road. The item before Council this evening is the approval of the design contract for Bethel Road from Freeport Parkway west to the city limit line. The design of Bethel Road should be less complicated than the design of West Sandy Lake Road. However, there is one item which is an unknown at this time. That is the offsite drainage. Based on prior estimates, there is approximately five million dollars allocated to construct facilities to accommodate offsite drainage associated with Bethel Road. There is about 410 acres of land that drains to the intersection of Freeport Pazkway and Bethel Road. Of the 410 acres, the only developed portions are the Minyards wazehouse and the Postal facility. There are 243 acres of this drainage basin on DFW Airport property. This stretches about 3000 feet south of I.H. 635. The real challenge of this design will be to determine the drainage system necessary to convey not only the current watershed but also the fully developed watershed. As Council may be aware, DFW Airport has been somewhat aggressive in the past few years on developing some of their outlying pazcels. Therefore, we anticipate that part, if not all of the 243 acres on DFW property, will be developed at some point in the future and as such the drainage system in Bethel Road should be sized to convey that water. However, strictly building box culverts to efficiently convey water to the Freeport/Bethel intersection could be detrimental on the downstream creeks that wind beside the Senior Citizens Center, Hunterwood Subdivision, Old Coppell Estates, Big Cedar Addition, etc. In 1999, the City of Coppell participated in the Southwest Stormwater Management Master Plan Study with property owners along Bethel Road to study the drainage. The result of that study showed that a regional detention basin should be incorporated somewhere along Bethel Road to accommodate future drainage. 'This would reduce the need for massive drainage systems all along Bethel Road and also would control the discharge of water into existing creeks and help prevent extensive erosion in the future. 'The major drawback to that study was that that the optimum location for the regional detention basin is at the "CrrY OF COPPELL ENGINEERING -EXCELLENCE BY DESIGN" ,._„ ,.-. southwest corner of Royal and Bethel, on DFW Airport property. This is generally the location of our current field storage and sign/signal shop. Legally, the City of Coppell cannot require that DFW Airport construct a detention basin. I mention the above history to help explain why the design cost of this project is somewhat greater than what I anticipated when preparing estimates for the bond election in mid-1999. We have asked the consultant to evaluate various drainage options, including regional detention or possibly various smaller detention basins. The consultant is also evaluating the impact of the drainage on the existing creeks and modeling various scenarios so that decisions can be made by City staff on what direction to take. Also, part of the consultant's contract includes meeting with DFW Airport to determine if we can work together to resolve the drainage issues associated with the development of Bethel Road. There is approximately $90,000 of this contract associated strictly with surveying of creeks and hydraulic studies of various options. We have also asked the consultant to pay particular attention to irrigation systems, both existing and proposed, and design those systems to meet the irrigation needs of the future Bethel Road. This is an item that was generally overlooked with the design of the Sandy Lake Road project and which has caused the City to spend additional dollars on retro-fitting irrigation systems. That adds approximately $20,0000 to the design. Typically, when we bid construction projects, we require contractors to conform to the Texas Manual on Uniform Traffic Control Devices on maintaining traffic. However, because Bethel Road is one of the main east/west routes in the commercial area of west Coppell, we have asked the consultant to prepare a Traffic Control Plan to address phasing of the various components of construction. Also, detours may be included in that traffic plan. The additional traffic control design by the consultant has added approximately $20,000 to the design. The three items discussed above are approximately $130,000 of the $499,000 design fee. During my review of Bethel Road for inclusion in the bond program, I estimated that the engineering design cost would be approximately $300,000. When you remove the items listed above, the apples to apples design fee is approximately $69,000 different. That difference could still somewhat be attributed to the complexity of trying to provide a completed design while incorporating all the facets of the drainage. It should be noted that the goal of evaluating the drainage in such detail is to hopefully reduce the estimated $5,000,000 associated with the construction of facilities for offsite drainage. Also, if we are successful in securing a location for a detention basin, then there would be a future amendment to this contract to provide for the actual design of the detention basin. Staff recommends approval of entering into a contract with TranSystems Corporation for the design of Bethel Road from Freeport Parkway to the west city limits in an amount not to exceed $499,569.00. Staff will be available to answer any questions at the Council meeting. 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