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ST9301-CS 960124DALLAS COUNTY PUBLIC WORKS January 24, 1996 Mr. Kenneth M. Griffin, P.E. Assistant City Manager/City Engineer City of Copper P.O. Box 478 CoppeR, Texas 75019 Re: Sandy Lake Road - Project No. 91-830 (MacArthur Boulevard to Coppell/Dallas City Limits) Riverview Estates Drainage (a.k.a. the Johnny Thompson Tract) Dear Mr. Griffin: Upon our request, Sverdrup Civil, Inc. has investigated the storm water runoff contribUtion to the referenced project by the proposed Riverview Estates (see attachments). This review has determined 5.59 acres zoned "R" (retail) fronting Sandy Lake Road will contribute approximately 44.7 c.f.s., 100 year design frequency, to the Sandy Lake Road storm sewer systems. Approximately 78% (34.7 c.f.s.) will drain to the east, and 22% (10.0 c.f.s.) will drain to the west, and are being incorporated into the Final Design of the Sandy Lake Road Bridge Project, and the Sandy Lake Road/Coppell Project, respectively. Should you have any questions, please do not hesitate to call me, or Abel V. Saldafia, P.E., Project Engineer, at 653-7153. Sincerely, Allen Bud Beene, P.E. Director of Public Works~ ABB: avs Attachments xc: Commissicmer Jim Jackson, District 1 Irv S. Griff'm, P.E., Project Engineer, Dallas County Public Wodm David Howard, P.E., Project Manager, Sverdrup Civil, Inc. 91-830:WfDtain.[.~ 41 1 Elm Street ' Dallas, Texas 75202 653-7151 FLOODPLAIN AD~.~. STRATOR THE OWNER/D~ELOPER REQUESTS THE FOLLO~I~ ,-~L~-~ ..... :' VARIANCES FROM THE SUBDIVISION ZONING: ~I ['~ ~'r~ I~ U~/~,lh', TOTAL LOTS -- 8 ? TYPICAL LOT = 75'x120' II !1 CURRENT Z~©IxltNG -- S'F---9 PLATTED AREA -- 18.9827 AC. DEVELOPER: HUFFINES & PARTNERS, INC. 7OO 1 PRESTON ROAD SUITE 222 DALLAS, TEXAS 75205 (2 ~ 4) 526-.~ooo D. blAIER ENI3~NEERS, ~NC. Suite 300 ~3g-47~,1 I! PRELIMINARY PLA T 18.9827 ACRE TRACT COPPELL, TEXAS design drawn scale date notee job number CMD DRP !' og-o4-g! NDM g!-oa-075 ZONING **R' ZONI NG CREEK DRIVE $F--7 ZONING