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ST8805-CS 881014dP Jerry Parch Consulting Engineers October 14, 1988 City Engineer City of C~pell P O Boxff78 Coppel~ Texas 75019 214/462-0022 RE: JP No. 88009; Flood Plain Reclamation Study; Parks of Coppe11; Coppe11, Texas Dear Russell: On Friday, October 7, 1988 we provided two copies of a study entitled "Flood Plain Reclamation Study on Cottonwood Branch and Denton Creek for Construction of Parkway Boulevard and High School Access Road" to the City. Pursuant to our conversation on Wednesday and your letter of October 7, 1988, enclosed herewith is the following additional information that you requested· Another copy of the aforementioned study including Exhibits A and B. Three copies of the creek cross sections as included in our original submittal that were utilized in the hydraulic analysis. Three separate copies each of Exhibits A and B as included in the folder in the back of the 'study. In your letter of October 7, 1988, you state that the referenced study will be submitted to FEMA on Monday (i.e. October 10, 1988). I inferred from your statements in the first two paragraphs that in the' interests of expediting the project, the study was submitted to FEMA with no prior City review· Also in your letter you emphasize in the first two paragraphs that you have assumed that our study complies with all ordinances and requirements· I can assure you that as engineers for the project our primary concern is to provide a safe design that complies with all City, State and Federal requirements. Following is a brief history of our efforts to understand the City requirements regarding flood plain reclamation in the Parks of Coppell west of Denton Tap Road since our firm was engaged by ABQ Development Corporation to provide engineering services on this project. In addition, in response to your request to submit all information to you regarding the "Grandfather·d" status of 6001%V. Interstate 20, Suite 209, LB 32 · Arlington, Texas 76016 · Metro (817) 572-3458 · (817) 561-2108 Mr. Russell Doyle, P.E. JP No. 88009 October 14, 1988 Page 2 of 4 the Parks of Coppe11 west of Denton Tap Road, the following documentation is attached for your files and will be referenced in the following discussions. Letter dated May 25, 1988 from Mr. H. Wayne Ginn, P.E., City Engineer of Coppell to Mr. Mike Allen of Univest Development Company with the following attachments: ae Letter dated April 4, Ginn. 1988 from Mr. Allen to Mr. be Letter dated November 8, 1982 from Michael Baker, Jr., Inc. to Mayor Andrew Brown, Jr. Letter dated September 24, 1987 from FEMA to Mayor Lou Duggan. d. Letter dated May 3, 1988 from FEMA to Mr. Ginn. A copy of a letter I 1988. sent to Mr. Ginn dated June 8, A copy of a letter I sent to Ms. Maryetta Cunningham of FEMA dated June 17, 1988. A copy of a letter I sent to former flood plain engineer dated June 17, 1988. Mr. Carl for the Anderson, P.E., City of Coppe11, A copy of Mr. Ginn's response letter to my June 8, 1988 letter, dated June 21, 1988 with the following attachment: a. Ordinance No. 219 of the City of Coppe11, effective June 24, 1980. On June 3, 1988 Mr. Jay Chester of ABQ and I met with Mr. Allen who provided us with the documentation listed under Item No. 1 above stating that the PCJV property is exempted from the provisions of the recently adopted Flood Plain Management Ordinance. It is my understanding that Mr. Ginn's letter of May 25, 1988 (Item No. 1) and his signature at the bottom of Mr. Allen's letter of April 14, 1988, (Item No. l-a) confirm this exemption. Having been advised that the Parks of Coppe11 Property had been exempted from the October 1, 1987 Flood Plain Management Ordinance, I sent a letter to Mr. Ginn dated June 8, 1988 (Item Mr. Russell Doyle, P.E. JP No. 88009 October 14, 1988 Page 3 of 4 No. 2) and requested criteria under which the evaluated by the City. that he provide me a letter stating the proposed reclamation project will be In the meantime, I requested the current effective flood plain models of Denton Creek and Cottonwood Branch through the Parks of Coppell west of Denton Tap Road from FEMA (Item No. 3). For reference purposes, I also requested copies of available flood plain models prepared by Mr. Carl Anderson of the City of Coppell in my letter to him of June 17, 1988 (Item No. 4). However, I understand that Mr. Anderson's models are not currently recoganized as effective base flood models by FEMA. I obtained Mr. Anderson's flood plain models in a meeting with him on June 22, 1988. Mr. Anderson prepared an extensive study of the City's flood plains including modelling of channel improvements, determination of peak flood discharges for multiple frequency events and determination of the 100-year flood plain with existing channel conditions. His studies did not include floodway computations or floodway modelling however, to the best of my knowledge. Mr. Ginn provided me a letter dated June 21, 1988, (Item No. 5), responding to my request for direction on preparing the flood plain reclamation study. Since I had previously advised a staff member of Ginn's office that I had already contacted FEMA, the Corps of Engineers, Mr. Anderson, and several engineering firms with projects in this area, for flood plain data, he felt it best that I obtain computer models of the flood plain from these sources. Regarding the criteria or ordinances that will be applied to evaluate our flood plain reclamation study by the City of Coppell, Mr. Ginn provided me a copy of the City of Coppell Ordinance No. 219 (Item No. 5-a). Section 5.3 of this ordinance is in accordance with FEMA regulations as stated in the National Flood Insurance Program and Related Regulations, Part 60, Subpart A, § 60.3. To my knowledge, other areas in the Parks of Coppell and in the Villages of Cottonwood Creek were reclaimed in compliance with this regulation. Our study has been prepared in compliance with the provisions of Ordinance No. 219, and Section 5.3 of this ordinance in particular, as directed by Mr. Ginn. In addition to the correspondance and discussions described above, I have had numerous meetings with other engineers who have prepared studies for projects in this area including Vista Ridge, Century Park, Parks of Coppell, and Villages of Cottonwood Creek, as well as with Mr. Anderson on a study he prepared for some proposed grading work in the City Park. Dewberry and Davis could not provide us current comprehensive effective hydraulic models Mr. Russell Doyle, P.E. JP No. 88009 October 14, 1988 Page 4 of 4 of Denton Creek and Cottonwood Branch due to the various states of review and approval of the many recent pro~ects in this area. As I discussed with Mr. Chris Ulsch of Dewberry and Davis, we have prepared flood plain models of Denton Creek and Cottonwood Branch based on our compilation of the existing computer models prepared for the individual pro~ects that have now been completed in this area. I trust that the information and attachments presented herein have satisfied your request for "grandfathered" documentation and have provided you additional information to evaluate our study. We appreciate your continued cooperation in asisting us in obtaining necessary City approvals and a Conditional Letter of Map Revision from FEMA. If you need any further information or would like for me to meet with you and discuss these matters, please call. Sincerely,~ yerry'Parche', P.E. JP:ch cc: Mr. Jay Chester, P.E./ABQ Development Corporation Mr. Wayne Ginn, P.E./Ginn, Inc.