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DR8601-CS 860616June 16, 1986 Mr. Ed Powell, P.E. Coppell City Engineer City of Coppe!! P. O. Box 478 Coppell, Texas 75019 RE: Drainage channel adjacent to Parkwood III Dear Mr. Powell: I am writing to you in response to the report prepared by Espey, Huston & Associates, Inc., ("EH&A") and the presentation of Mr. Bob Whaling, Project Manager for EH&A, at the May 20, 1986 workshop. I am sure you will agree that I have made numerous attempts to meet with you so that all the facts regarding the channel could be considered. These requests were made in writing, through phone messages and personal requests. No meeting was ever scheduled and, on May 20, I was surprised to learn that the City had already obtained a report supposedly analyzing the failure of the drainage channel. The report prepared by EH&A is incomplete since it has not addressed the actual flows that the channel is required to maintain. At the May 20 workshop, Mr. Whaling stated that the earthen channel would incur erosive velocities which were as high as 14 ft/sec. EH&A calculated that the resulting flow for such a velocity is 2,755cfs. In reality, the maximum design flow (100 year storm) for this channel is less than 700cfs. The actual velocity is significantly less when this realistic quantity of flow is used. In addition, an investigation of the As-Built Plans would have shown that the actual side slopes were not 3:1 as used in the report, but were closer to 4:1. This discovery would have decreased the calculated veiocites even more. It is my understanding that the City has the As-Built Plans for the channel. I feel that these plans should have been made available to EH&A in order to provide a more specific analysis of the existing conditions prior to the failure. It appears to me that EH&A has provided the City with an extremely unsatisfactory report and the statements made at the workshop were misleading and slanted to discredit the design and construction of the channel. Jeff Hawkins, Engineer for the C0ppell Municipal Utility District No. 1, has suggested in a March 25 letter to you that the problem was caused when a large amount of excavation took place immediately downstream of the concrete pilot channel. The excavation lowered the outfall of the channel a.~proximately ten feet (10')~ The extremely erosi_ve characterisLics of an outfail such as ~ne one caused by the excavation should be obvious to any professional. I am surprised that a firm such as EH&A did not research the possibili.ty of the failure occurring because of the excavation. 15301 Dallas Parkway, Suite 1020 / Dallas, Texas 75248 / (214) 392-9200 Mr. Ed Powell, P~.E. June 16, 1986 Page 2 While meaningless reports are being produced, the drainage channel situation is getting worse. I understand that adjacent property owners have been complaining for some time about the eyesore the crumbled channel presents. More recently, the citizens are complaining about the enormous bug problem caused by stagnated water in the channel. A visual inspection of the channel shows that the erosion is very close to claiming the adjacent alley and already has caused the failure of a headwall, rip rap and a joint of storm sewer pipe. With every rain, this problem will get more expensive for the City to resolve. Although we feel this problem is the responsibility of the City of Coppell, General Homes has made considerable effort in trying to assist the City with its analysis of the situation. I assure you that, short of any monetary contribution, we will attempt to continue in this effort. Sincerely, · l Project Manager SH:kp cc: Coppell Council Members Lou Duggan, Mayor Jeff Hawkins, CMUD Frank Proctor, City Manager Bob Whaling, EH&A George Dudley, Threadgill-Dowdey Tom Wise, Univest REQUESTS AND PRESENTATIONS Item 3: Presentation by Dallas County Appraisal District about taxing authority. Mayor Duggan recognized Mr. Earl Page and Mrs. Patsie Guest from the Appraisal Review Board. Additionally Mr. Ken Noland staff member of the Dallas Appraisal District was present and gave a review of the Appraisal Districts and the appeals procedure. Mr. Noland stated that name changes on property ownerships are now current which means thirty-seven (37) days after a change has been made the corrections does appear on the Districts roles. No action was required on this item. Item 4: Discussion and consideration of a request by General Homes for reimbursement of Developer Fees. Mr. Sam Wyse and Mr. Skip Hyneck of General Homes and Mr. Mike Attorney for General Homes made the presentation to the Council.[~There~ requests ~°~or reimbursement of fees assessed to them in the development of their property. City Attorney Larry Jackson stated that the fee schedule has been applied uniformly and fairly to all developers within the City since 1983 and these fees from the schedule have been used in preparation of the annual budgets. Mr. Jackson also stated that he felt that the City was proper in the assessment of these fees. Public Work Director, Steve Goram stated that all fees have been applied to and collected from every developer in the City consistently. Following discussion and consideration of this item, Councilman Wilkerson moved that the request for reimbursement by General Homes be denied. Councilman Morton seconded; motion carried unanimously with Councilman Wilkerson, Councilman Morton, Councilman Smothermon, Councilman Cowman, Councilman Wolfe and Councilman Stanton voting in favor of the motion. O INA C S RESO ,UTIONS Item 5: Discussion and consi{~ration of amending the Ordinance c~eating the EconomicVDevelopment Board to specify directions and guidelines for this Board. Mr. John Bailey, Chairman of the Economic and Development Board and Boardmembers Peyton Weaver, Jay Turner and Jim Brown were present to discuss this item with the Council. Funding for this Board as well as wording on an amendment to the Ordinance creating this Board were discussed. No action was taken on this item. Stem 6: Discussion and consideration of a proposed Pa~ing Assessment Ordinance and setting out the procedures for assessment of paving projects. Consulting Engineer Wayne Ginn made the presentation to the Council. He reviewed the proposed Ordinance with the Council and stated that it does comply with State Statutes which allows the City to assess for 100% of curb, gutter and sidewalks and 90% of other street construction costs. It was the consensus of the Council that they endorce the concept of this Ordinance and instructed the City Attorney, Larry Jackson to prepare an official copy for consideration at a later date. STAFF REPORTS Item 7: Discussion and consideration of drainage ditch located adjacent to Parkwood II. Mr. Skip Hyneck of General Homes was present to discuss this item with the Council. City Engineer, Ed Powell introduced Mr. Bob Whaling of Espey, Houston and Associates who are~experienced in hydraulics and environmental aspects of engineering. 4~r. Whaling stated that his firm analyzed the design section of this part of the creek and it is their conclusion that the erosion was caused by excessive velocity through the channel in the earthen channel and unprotected part. The erosion then proceed up stream and undermined the concrete pad. City Engineer, Ed Powell stated that he felt there was a problem with the original design of this chamnel which was designed by Fred Gildoughty at the request of General Homes and Univest. Following discussion and consideration of this item, the City Council instructed the City Engineer to pursue the repair of this drainage ditch with the developer. Item 8: Discussion and evaluation of the City's funding options for construction of Beltline Road east and west in its existing location. Due to further study being required on this item, it was withdrawn from the Council Agenda at this time. Item 9: .Ouarterly Project Status Report on Capital Improvement Projects (CIP) and miscellaneous projects. Consulting Engineer,_ Wayne Ginn furnished a status report for the Council. A copy of this report is filed as a permanent part of the City Records. ¥~r. Skip Hyneck then asked to be recognize~ and stated that he make a statement to the Council concerning Item No. 4 on genda. The statement read, "In regard to matter discussed as 4 on the workshop agenda for May 20, 1986, any comments, proposals, or other statements made by General Homes Corporation were made for discussion and settlement purposes only and are not intended or to be construed as a waiver of any of its legal rights." The meeting was then adjourned. ATTEST: Lou Duggan, Mayor Dorothy Timmons, City Secretary MINUTES 052086 NOTES Minutes of May 20, 1986 The City Council of the City of Coppell met in a special called meeting and work session on iuesday, May 20, 1986 at 7:00 p.m. for an Executive Session and 7:3G p.m. for Open Session in the Coppel! High School Administration Building. ,-he following members were present: Leu Duggan, Mayor Dean Wi!kerson, Councilman Tom Morton, Councilman Bill Smethermon, Councilman Jim Cowman, Counci!=~n Mark Wolfe, Councilman Dan Stanton, Councilman Mayor Pro Tom Dale Ware was mot present. Also present were City Manager Frank A. Proctor, Jr., City Secretary, Dorothy Timmons and City Attorney Larry Jackson. Mayor Duggan called the meeting to order. EXECUTIVE SESSICN (Closed to the public) Item 1: Article 6252-17, Section 2 (e) discussion with City Attorney. The meeting then went into Executive Session as allowed under the above stated article. Following the Executive Session the meeting was declared open to the public. Mayor Duggan asked everyone to stand while Councilman Wolfe gave the invocation. Mayor Duggan then recognized Mr. Mark Huey representing the Life Aid Concert to be held on Saturday June 7, 1986 from 10:0C a.m. to 6:00 p.m. at Korthlake Park. Mayor Duggau requested that any persons having questions or problems concerning this concert to contact Mr. Huey at his home Telephone Number 827-2718. WORK SESSION (Open to the public) item 2: Discussion and orientation about the Coppel! Municipal ~tility District Nc. i and how it works. Mr. Larry Martin, President of the Municipal Utility District introduced Paul Phy, Attorney for the District and .~C~ Boardmembers Mr. Bob Rehm, Mr. Char!ie Wade, Mr. Terry Long and Mr. Mark Brenner as well as Mr. Jeff Hawkins, Engineer for the .~Tt~ District. Mr. ~hy then gave a history of the implementation of the Municipal Utility District which originated in 1978 for existing residence to tie on to the ML'D lines. Reimbursement plan was constructed tc entice developers to build within the boundaries of the Municipal Utility District. However, changes are being considered in the reimbursement contracts in order to make it more beneficial to the District. Developments being considered for annexation te the .~ft~ District at this time are Lincoln Properties, The Royal Lane Development and Ncrthport Business Park. Additional items being discussed are the sewer pipe located in the park land which appears tc have been damaged by the excavation of dirt in this area and the co!let=ion of delinquent taxes for the District. No action was required on this item.