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Georgetown Pl/FP-CS 850213THREADGILL-- DOWDEY & ASSOCIATES CONSULTING ENGINEERS 16250 DALLAS PARKWAY SUITE 100 DALLAS, TEXAS 75248 (214) 931-0694 February 13, 1985 Mr. John V. Wankum Ginn, Inc. 16135 Preston Road Suite 106 Dallas, Texas 75248 Re: Georgetown Plaza Dear Mr. Wankum: In response to your letter of February 7, 1985 regarding subject project we offer the following information. Each item below corresponds to your item numbers in your letter. 1. The temporary asphalt connection has been changed to have a 20:1 taper. 2. The storm sewer system is designed in accordance with the subdivision ordinance of Coppell. Any difference between the 100 year flow and the 5 year flow will be contained within tile 6" curbs of the paving section and will proceed to the existing ditch along Samuel Boulevard. There is also a solid masonry wall proposed along the north property line of project which would prohibit any water from entering the property to the north. Additionally no more water is being discharged into the existing ditch along Samuel Boulevard than. goes there at the present time. 3. The ditch along Sandy Lake Road from the end of the pro- posed 45" R.C.Pipe will be approximately 230 feet as shown on the revised profile. The cross section of the proposed and existing ditch are shown on the profile sheet. An additional 21" R.C.Pipe will be installed under the Meadow Run intersection to facilitate the 5 year flow across the intersection. Headwall details have been added to the storm sewer plans. o The site plan showing all dimensions and walls have been previously submitted by the architect. - 5. The sanitary sewer has been revised to meet the require- Mr. John V. Wankum February 13, 1985 Page 2 ments for city maintenance. The fire hydrants have been located as specified and the valves added. These items have been changed on the water and sanitary sewer plan. o The small amount of water which we do not pick up in inlets will sheet flow across the north entrance and into the existing ditch along Samuel Boulevard. The existing storm sewer systems available to pick up water from Samuel Boulevard drainage are shown on the drainage area plat (Plate No. 5). The surface flow from Samuel Boule- vard and this site must go to those systems. We are only contributing approximately one-half acre of area to the street surface flow, of which at least half is grassy area. A surface flow of 3 c.f.s, is no more than that which is presently floWing into the ditch. We are submitting four sets of revised plans to Mark Sweeney today and are including one set to you with this letter. It is our understanding that with these revisions and explanations, the final plat will be scheduled on the February 21, 1985 agenda of the Planning and Zoning Commission for Coppell. Thank you for your assistance i'n this matter. Very truly yours, DMD/sc cc: Mark Sweeneyv//~ Jeff Stone THREADGILL-DOWDEY & ASSOCIATES Dan M. Dowdey, P.~.