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Applicant response-DRC 2/3/87 I I--- l PIERCE-LUNSFORD ASSOCIATES, INC. CONSULTING ENGINEERS February 3, 1987 MS. Shohre Daneshmand RECEI'¢;-:. 0 3 1987 Engineering Department City of Coppell P.O. Box 478 Coppell, Texas 75019 Subject: Design Committee Review Advantage Self-Storage (Final Plat) Dear Ms. Daneshmand: In answer to the Design Committee's review of the above subject project, the foregoing answers the engineering questions in the order that they were presented. ENGINEERING (Shohre Daneshmand) 1. The property line has been shaded to clearly show the property lines of the site. 2. We have added a 6' curb-inlet to supplement the existing 10' inlet at the cul-de-sac on Northlake Drive. At Q5 plus the overflow to the drainage swale to the north of the cul-de-sac. The storm sewer capacity now meets your drainage standards. 3. All calculations for the subject project were made using Technical Paper 40 to compute rainfall intensities. Design criteria allows for a five year Frequency Storm if provision is made for the overflow. 4. Hydraulic calculations have been corrected using Q100 as in accordance to your Ordinance. 5. Contours for the drainage area map were taken from a U.S.G.S. Map. The site grading plan are correct as they were made by my survey in the field. Corrections have been made. 6. X-inlet is City of Coppel 1 standard details. Outside dimensions of X-inlet is 5' square shown on plans. 7. Our plans will be combined with the a rchitectual plans prepared by Joseph Gordon, Architect, which will be presented to you under his cover sheet. 8. Inlet calculations have been added to the Plan Sheet as requested. 9. The 28 CFS By-Pass on Drainage Area 2 will now be accommodated in a 36" storm sewer. 3109 CARLISLE. SUITE 206 3901 W. PIONEER PARKWAY, SUITE 100 DALLAS, TEXAS 75204 ARLINGTON, TEXAS 76013 (214) 871-2126 (817) 461-5868 Metro Ms. Shohre Daneshmand February 3, 1987 Page 2 10. The storm sewer system is designed for a 100 year Frequency Storm without overflow. The storm sewer system is now adeq ua te. 11. The design engineer and the owner consider the site drainage adequate for the purpose. 12. We have shown the storm drainage system on the Site Grading Plan (Sbt. C-2) as requested. 13. The 2-45° bends where it makes a sharp turn through the project allow adequate flow passage. 14. We will furnish you a letter signed by the adjacent property owner, William G. Thompson granting permission for grading on his property. 15. Flow arrows have been heavied up to show the sheet flow of the storm water on the site as requested. 16. Dimensions have been added to the proposed drainage easement on the final plat for the property in the northwest corner of the project. 17. There is only one rest room in the apartment on the site. Standard construction for a 4" line into the existing 8" line will be through a sanitary wye. 18. All Times of Concentrations used in the calculations of this project have been 10 minutes. 19. The owner has furnished the Director of Public Works the required Maintenance Agreement. 20. Construction Cost Estimate for all work on public property is a t tac hed. DEVELOPMENT INSPECTOR 1. "X" inlet is 5' square. 2 & 3 are architectural questions and have been answered separately. 4. (a) Access to the property is provided by a gate at the cul-de-sac on North Lake Drive through a paved entrance. MS. Shohre Daneshmand February 3, 1987 Page 3 (b) An additional 6' curb inlet has been added to handle the 5.4 C.F.S. 5. The fire line has been redesigned with a center valve that allows segmented out-of-service sections of the line and keep parts of the line in service. 6. Slopes on drainage channels will be hydro-mulched. The owner will pay 50% of the $440.00 water and sewer availability fee for the apartment prior to the Council meeting on February 10, 1987. Thank you for your time and consideration in review of this project. If I can be of further assistance in clarifying design matters, please call me. Sincerely Yours, PIERCE-LUNSFORD ASSOCIATES. INC. Richard C. Pierce, P.E. President RCP/sh cc: Joe Beard Jd Dmcnll~'l~ QUANTITY UN I T UU I T ' P~ I CE T~ / m m m m m i mm m m mm mm " ,,.J ,, TOTA~ i iii i iii ii ii i i i i i i i i i i i iiiii ii iiiI