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Parks Coppell ABQ-CS 880711.~, ~~ Jerry t'arche Consulting Engineers July 11, 1988 '- Mr. Jay Chester, P.E. ABQ Development Corporation P. O. Box 25625 Albuquerque, NM 87125 505/242-3330 RS: JP land Conversion; Parka of Coppell; Coppell, Texas Dear a . According to your request, I have listed below the benefits and deficiencies of each of the proposed alignments for Parkway Boulevard through the area of the City Park. The proposed alignments are shown on the exhibit enclosed. These comments are based on preliminary alignments determined from the seller's boundary survey and scaled distances from property corners to existing Parkway Boulevard at the property perimeter. Alignment A - Route Through Southwest Corner of the City Park Favorable Qualities 1. Minimum roadway length - approximately 3188 ft. through the Parks of Coppell. 2. Consistent with the City of Coppell Major Thoroughfare Plan. A copy of the city's thoroughfare plan is attached. 3. Preferred alignment for traffic operation due to A. The Cottonwood Creek bridge is on a straight alignment increasing the potential for maintaining control in icy conditions. B. Minimum length of curvilinear alignment should yield improved operation due to easier maneuverability and longer sight distances. C. The intersection with the proposed high school access road offers good sight distances for turning maneuvers. 4. Offers opportunity for additional park access. Deficiencies 1. The proposed Right of Way impacts approximately 0.68 acres in the southwest corner of the city park. It is estimated that an additional 0.45 acres is needed 6001 W. Interstate 20, Suite 209, LB 32 • Arlington, Texas 76016 • Metro ~817J 572-3458 • ~817~ 561-2108 Mr. Jay Chester, P.B. JP No. 88009 July 11, 1988 Page a of 4 for slope easement. These impacts Mill require approval of a Parkland Conversion by the Texas Department of Parka and Wildlife. Z. The centerline radius of 640 feet near the Denton Tap Road intersection is leas than the minimum radius specified in the City of Coppell Subdivision ordinance of 8a0 feet for this type of roadway. 3. Approximately 300 ft. of the existing crushed rock dogging trail within the park must be relocated. Alignment 8 -Outside of City Park. Favorable Qualities ' 1. Since the alignment does not impact the city park, a Parkland Conversion is not required. a. The length of the High School Access Road is reduced. 3. The intersection With the High School Access Road offers good sight distance for turning maneuvers. 4. Bridge length may be reduced slightly compared to the length required with Alignment A due to the apparent reduced skew to the creek according to currently available topography. The bridge location is in the floodway of Cottonwood Branch only which eliminates hydraulic impacts on the Denton Creek floodway. 5. Centerline radius are in accordance with minimum radius specified by ordinance. Deficiencies 1. Ths alignment places the Cottonwood Creek bridge on a • curve yleldinQ more difficulty in maneuvering in icy conditions. I ~. The curved alignment of the bridge will significantly increase construction coat. 3. The length. of the roadway within the Parks of Coppell is approximately 111 ft. longer than with Alignment A. 4. The increased curvature of the roadway will hinder traffic operation due to reduced site distances at driveway intersections and lack of a straight section between the reverse curves. "~ Mr. Jay Chester, P.B. JP No. 88009 July 11, 1988 Page 3 of 4 5. The proximity of the roadway to the discharge channel that currently extends north from the northeast corner of the high school site will require an additional culvert under Parkway boulevard to convey the flow under the roadway embankment. The culvert size in the high school property is a two barrell - nine foot x five foot box culvert. Ali4n'aent C - "Original 1111Qnment" Favorable 4ualities 1. The City of Coppell has reported that the Texas Department of Parks and Wildlife has indicated that a Parkland Conversion will not be required if the roadway ' Right-of-Way follows the original alignment even though a portion of the Right-of-Way will extend through the City Park. A Parkland Conversion may be required, however, due to the need for a slope easement on park property on the •aat aide of the right-of-way. a. This alignment will likely result in minimum bridge length over Cottonwood Branch due to apparently only a minor skew angle between the creek and the roadway agcording to currently available topography. Deficiencies 1. .This alignment is not in compliance with the Major Thoroughfare Plan of the City of Coppell. Z. Ths introduction of a 90 degree turn in the roadway will severely hamper traffic operations. The location of this intersection is less than 800 feet from the intersection with Denton Tap Road, a major intersection. westbound through traffic will be required to slow down significantly to execute the 90 degree turn. Bastbound through traffic will be subjected to p signalized left-turn condition. The driving conditions this intersection will impose are not in accordance with the primary function of a major arterial which is to provide service to through traffic. 3. The High School Access Road should intersect Parkway Boulevard where Parkway Boulevard will extend north and cross Cottonwood Branch. This will likely require redesign of the Access Road on the High School property, which is currently under construction. Mr. Jay Chester, P.S. JP No. 88009 July 11, 1988 Page 4 of 4 4. The extension east of this intersection as an arterial street seems to yield little value since properties Mast of the. Parke of Coppell in this area are already developed and plans for the school site shots access roadaays adjacent to the north property line. 5. The centerline radius extending north of Cottonwood Hranch is less than the minimum radius required by city ordinancd. 6. Approximately X00 ft. of the existing crushed rock jogging trail within the park must be relocated. There map be other favorable qualities and deficiencies for each of the proposed alignments. However, I trust that the information presented herein is in accordance with your request. You may wish to engage the services of a traffic engineer if you feel that further study of these alignments is warranted. If you have any questions, please call. S ncerely, erry Parche' JP:ch Enclosures: Two copies of Proposed Right-of-Way Exhibit Major Thoroughfare Plan - City of Coppell \ ~ \vr \\S} ~ \ ~. 1~ m y ~\ ~ / ~`\~ ° ~ ` i +~ ~ _ e ~) 1T,, c ~ ~ I r i ~ / ( • II\ \ > i / ° ''~9 w PARKWAY B ~' -X k m ~ ~w K~4~~~~ > > ~ ~_ - i PGA ~.' 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