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ST9902-CS121130 tnpDATE 11/30/12 JOB NO. CPL00243 teague nail & perkins RE: W. Sandy Lake Road - Phase 2B TO: City of Coppell S.i c)q — QZ 3 R.{ a Attn: Keith Marvin, P.E. 255 E. Parkway Blvd. P.O. Box 9478 Coppell, TX 75019 WE ARE SENDING YOU ® Attached ❑ Under separate cover via the following items: ❑ Shop drawings ❑ Prints El Plans ❑ Samples ® Specifications ❑ Copy of letter ❑ Change Order ❑ COPIES DATE NO. DESCRIPTION 2 Full Size 99% Submittal Plans 2 Half Size 99% Submittal Plans 2 Draft Specifications 1 Submittal Summary Letter THESE ARE TRANSMITTED as checked below: ❑ For approval ❑ Approved as submitted ❑ Resubmit copies for approval ❑ For your use ❑ Approved as noted ❑ Submit copies for distribution ❑ As requested ❑ Returned for corrections ❑ Return corrected prints El For review and comment ❑ ❑ FOR BIDS DUE ❑ PRINTS RETURNED AFTER LOAN TO US REMARKS Keith, Attached are revised W. Sandy Lake Rd. Phase 2B plans and specs. Please let me know if you have any questions during the course of your review. Thanks, Andrew COPY TO: KEN08305-00 SIGNED: Andrew Luce, P.E. In enclosures are not as stated,please notify us immediately. C7 3 Fort Worth 1 100 Macon Street■Fort Worth,Texas 76102• 817.336.5773 4A Dallas 17304 Preston Road,Suite 1340,,Dallas,Texas 75252■214.461.9867 Denton 1517 Centre Place Drive,Suite 320 Denton,Texas 7620 ■940.383.4177 ,V y.,i,,e Sherman 200 North Travis Street,Suite 500..Sherman,Texas 75090 903.870.1089 + tnp teague nail&perkins www.mpinc.com November 30, 2012 engineers surveyors landscape architects Keith Marvin, P.E. City of Coppell 255 E. Parkway Blvd. P.O. Box 9478 Coppell, TX 75019 RE:W. Sandy Lake Road-Phase 2B 99% Submittal Dear Mr.Marvin, This letter is attached to the 99% plan submittal to assist you in reviewing the plans. Our intent is to and identify what components of the design have changed from the previous submittal. After you have had an opportunity to review the plans, we would like to meet with you to discuss any questions or comments you might have. General: • A demolition plan was created to provide greater clarity to the existing features to be demolished. • An erosion control plan was created. • All sheets were revised to reflect the Bellacere Addition at N. Whispering Hills. Roadway Design: • Revised median noses to reflect City standard detail 2140 " Median Island with Slope-End Nose. • Revised median nose location per City standard detail 2020 "Reinforced Concrete Pavement Four-Lane Divided Thoroughfare" so that median nose is set back one-foot from side street curb return. Based on turning movement analysis in Autotum, this was required also to avoid running over inside curb. • The extents of stamped concrete in the medians were revised to be wherever the median was less than or equal to eight-feet in width to meet the City's standard. • Paving profile was raised from approx. Sta 81+50 to approx. Sta 88+00 to provide adequate cover over the existing 24-inch high pressure gas line. The cover over Atmos gas line was approved via e-mail from Michael Wisnevski with Tritex, an Atmos representative, on 11-8-2012 with the stipulation that if construction grades fall below four-feet of cover, steel plates must be places over the existing gas line. Also, by raising profile allows the driveway connection to the existing Atmos service station to be made inside of the right of way, outside of their existing fence. • The revised paving profile from Sta 81+50 to Sta 88+00 will still allow positive drainage and minimal fill on the existing brick walls at 100 and 101 Summer Place Drive. • The high point in the paving profile at Sta 89+01 was removed to provide positive drainage at 100 and 101 Oak Trail where existing drainage issues are present. The revised profile also provides positive drainage for the area between Shady Dale Lane and Denton Tap Rd. on the north and south sides. • The transition was extended on Summer Place to reduce the grade break at the tie-in point. Fort Worth■1 100 Macon Street rs Fort Worth,Texas 76102■817.336.5773 ^ Dallas 17304 Preston Road,Suite 1340 Dallas,Texas 75252••214.461.9867 Denton 1517 Centre Place Drive,Suite 320—Denton,Texas 76205 940.383.4177 111, Sherman.200 North Travis Street,Suite 500 r•Sherman,Texas 75090 903.870.1089 Registered by the Texas Board of Professional Engineers,Firm No F-230•• Registered by the Texas Board of Professional Surveyors,Finn No.1001 116.00 • The transition was extended on Oak Trail to reduce the grade break at the tie-in point, add asphalt transition to maintain a standard width for the proposed concrete pavement, and to move the proposed driveway for 100 Oak Trail out of the curb return. • Obtained additional survey on Georgian Drive. In the original survey the lots for 103 and 104 Georgian Drive had not been developed. Identified water and sanitary sewer service replacement from right of way to proposed main, and areas needing retaining wall and driveway replacement due to proposed grades. • Increased return rise on Shady Dale Lane to prevent runoff in Sandy Lake from turning onto Shady Dale Lane. • Revised ramp types and orientation to meet ADA compliance. • Created trail plan and profile sheets to provide greater vertical control, ensure ADA compliance in regards to longitudinal slope, and better identify retaining wall locations and tree removal. • Revised signal pole and push button pedestal locations at Whispering Hills to meet ADA compliance. Traffic Control: • Identified areas requiring low profile concrete barrier (LPCB) due to difference in existing and proposed elevations. • Identified areas requiring temporary shoring due to difference in existing and proposed elevations with minimal room to grade between, requiring vertical shoring. • Changed side street construction from half to full street closure where detouring was possible to still allow residents access to Sandy Lake Rd. This was done due to the difference in existing and proposed elevations and to improve constructability. Drainage: • Storm drain line 'H' was created. In the previous submittal approximately 5.5 acres of runoff were not accounted for in hydraulic calculations (previous submittal hydraulic table Junct — LAT F8, Sta 10+90.06 reflects 5.34 acres of runoff while drainage areas F-9, F-10, F-11, F-13, and F-14 from the previously submittal total 10.74 acres). We were unable to increase the size of storm drain line 'F' due to proximity of the sanitary sewer horizontally and increasing the box height to four-feet tall would have created utility crossing conflicts. • Drainage area delineation was revised to reflect runoff received from Denton Tap. • The drainage area for the Verizon/GTE building was revised to reflect the roof drain that outfalls into the existing Sandy Lake Rd. ditch today (proposed storm drain lateral `H-2') • The drainage area at the southwest corner of Sandy Lake Rd. and Denton Tap was revised to reflect the inlet at 115 Sandy Lake Rd (proposed storm drain lateral G-9), see development plans for Sandy Lake Crossing Lot 2R—Block 1. • Included on-grade and sump inlet calculation tables for review and reference. • Provided profiles for the laterals at the low point on S. Coppell Rd. • Provided an inlet just upstream of 101 Oak Trail where drainage problems exist today so that a private system could be tied on in the future. • Revised storm drain line 'F' alignment from beginning to Shady Dale Ln. to increase separation from sanitary sewer and improve constructability. • Reconfigured tie-in to proposed 10'x8' box culvert to avoid 12'x12' junction box and to reduce head loss in the storm drain system. • Revised storm drain configuration at S.Whispering Hills.A drop inlet was placed in the west parkway to pick up runoff in the existing ditch. The proposed curb inlet along the east curb line was placed on the south curb line of Sandy Lake Rd. just east of S. Whispering Hills to avoid the relocated gas line, see Atmos relocation plans dated March, 2011. • Lowered proposed storm drain line 'F' in the area of Summer Place to provide more cover. • Added inlet at paving Sta 85+75 to meet spread requirements. • Reconfigured storm drain line `G' alignment to eliminate the 12'x12' and 9'x9' junction box and lowered the proposed box culvert to create separation from the existing/proposed sanitary sewer. See junction box detail, sheet D22. • Revised lateral profile at Summer Place (storm drain lateral F-9, previously labeled F-12) to create separation from proposed sanitary sewer. • Call out to replace storm drain lateral and curb inlets on Georgian Dr. due to proposed elevations. Utilities: • Changed proposed water line size at Cottonwood to match existing stub-out size and revised alignment to allow easier tie-on to future line. • Call out temporary pavement repair on utility open cuts for interim situation until paving construction is complete. • Call out proposed utility lines that cross existing Sandy Lake Rd. pavement to be bored to reduce impact on traffic. • Added a sanitary sewer manhole at the Georgian Dr. intersection to create a vertical PI to increase cover. • Removed sanitary sewer manhole at the end of proposed sanitary sewer line 'A-1' due to an existing driveway. • Lowered sanitary sewer line 'B' from Sta 1+79 to Sta 4+68 so that proposed sewer line `B-1" had a steeper grade. Per conversations with the City, existing sewer line 13-1' is very flat and has issues maintaining flow. • Added pressure rated pipe and cement stabilized backfill to sanitary sewer lines at some water line crossings to comply with TCEQ requirements. • Lowered proposed sanitary sewer line `B' from Sta 4+68 to End to maintain proposed flow line elevations below existing flow line elevations and avoid any issues with existing sanitary sewer services not being able to tie-on. • Lowered existing 24-inch water line at the proposed 8'x4' box culvert, storm drain line `G'. The existing water line elevation was shown incorrectly in the proposed storm drain profile in the previous submittal and would have been in conflict with the proposed storm drain. Lowering the 24-inch water line allows the proposed 8'x4' box culvert to be lowered also, increasing separation from the proposed 10-inch sanitary sewer line 'B'. Lowering the 24- inch water line will also involve removing and replacing the blow off assembly. Please let us know if you have any questions during the course of your review.We are available to meet at your convenience for whatever time is required to discuss the plans and your comments. We appreicate the oppurtunity to serve you. Sincerely, tnp Teague null&perkins Andrew Luce, P.E. xc: Mike Jones, P.E.