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ST9301-CS 961210Sverdrup Civil, Inc. 4SI 1 Oak La',v!~ Suqe 300 Dallas, Texas 75219 December 10, 1996 Mr. Abel Saldafia Project Engineer The County of Dallas Department of Public Works 411 Elm Street, 4th Floor Dallas, TX 75202 Sandy Lake Road Project 60% Review Comments Dear Abel: We have reviewed and dispositioned the comments received from the City of Coppell (dated May 20, 2996) and Dallas Water Utilities (dated July 18, 1996). We are still awaiting comments from other utility companies, which we hope are forth coming. Attached is the disposition of the comments. In general, most comments are straight forward and can be incorporated into the plans easily. However, some items require the County's attentioa and deliberation, so that a final decision can be made. Due to the period of time that the review has taken, and the issuance of new ideas and requirements fi-om the City of'Coppell, some comments require additional engineering and create numerous revisions to the plans. These items have been noted in the disposition comments. A~er your review of the disposition comments, Sverdrup would appreciate the opportunity to discuss them in order to provide closure to this phase of the project and move onto final design. Thank you for your cooperation and we look forward to hearing from you. Sincerely, Project Manager SLH/elk C: Project File 11889 Mark Goode Comments from City of~'oppell dated May 20, 1996 RE: Sandy Lake Road Project / ST 93-01 Question: As part of this project a sanitary sewer line is to be designed from MacArthur Blvd. east to the Sandy Lake Road li~ station. Answer: Design of the sanitary sewer will be completed on a forth coming submittal for the sewer, street lighting and signalization. 2. Question: At the beginning of the project on the north side of the road there will be an existing driveway for the Kroger Store that needs to be shown on these plans. I have provided a copy of the dimensional control plan to show the approximate location. If you need additional information please contact me. Answer: County of Dallas will provide survey information and the redesign of the project adjacent to the Kroger property will be completed This work would be considered additional design work. 3. ' Question: Is the ownership shown on Sheet 6 on the south side of the road correct? Doesn't this belong to the City? Answer: The ownership will be checked by AB&A and revised as needed 4. Question: The fight-of-way comer clip shown at the northwest comer of MacArthur Blvd. and Sandy Lake Road intersection was dedicated when the Kroger property was platted. I have included a copy of this plat for your use. Answer: The new plat will be transmitted to AB&A and the AB&A plat will be revised Plans will be revised to reflect new plat dedication. This work would be considered additional design wor~ 5. Question: Indicate the location of new pull boxes and conduit for the proposed upgrade of signal lights at the MacArthur Blvd./Sandy Lake Road intersection and the future signal lights at Riverchase Drive/Sandy Lake Road intersection. Answer: The pull boxes and conduit will be shown on the signal plans .for MacArthur/Sandy Lake Road intersection. The intersection at Riverchase and Sandy Lake Road is not included in the project. 6. Question: The City would like to discuss the possibility of eliminating the most westerly driveway on Sandy Lake Road for the Stop-in-Go and relocate it on MacArthur Blvd. Also, the City would like to look at a possible right mm lane for east bound traffic turning north onto MacArthur Blvd. (see Sheet 7). Answer: ,4 separate meeting needs to be hem to finalize the discussion on this item. Any relocation of driveways arM_a_d~itional turn lanes is considered additional design work. 10. 11. 12. Question: Answer: Question: Question: Answer: Question: Answer Question: Answer: Question: Answer: There question on how the parking lot for the retail strip located at the northwest comer of Kimbel Court and Sandy Lake Road drains. Please provide a drainage plan showing how the site will drain when the road is raised in front of this property. Will there need to be any offsite drainage modifications (see Sheet 7)7 The site drains to the inlets at each corner of the property. To provide a setnzrate drainage plan would be considered additional design work. The offsite drainage has been provided by the inclusion of drainage inlets at the corner of the property. There needs to be discussion about increasing the proposed radius for driveways into commercial sites. In order to increase these radii, the structures would need to be modified or the alignment of the roadway shifted Either option wouM be considered additional design work. The proposed low point inet located between the two existing driveways into the Landmark Nursery may conflict with what I discussed with you about eliminating one driveway into the nursery and moving the other driveway to where it would be across the existing driveway into the shopping center on the south side (see Sheet 8). Driveways were located based on existing conditions and to completely modify these driveways wouM be considered additional design work. There are some proposed low point inlets which need to be moved so that they do not conflict with locations of proposed driveways. We do not have any information regarding additional proposed driveways, so the inlet will be moved if a plat is submitted showing the extra location of the driveway. To move the inlet would require revision to the profile which is considered extra work. Provide the percent slope of all driveways on the plan and profile sheets. This information is provided on the driveway proJ~les (sheets 20-26). A note to clarify location of driveway profiles will be added to General notes. Is the fight-of-way on the south side of Sandy Lake Road shown on Sheet 9 correct? It would seem like everything north of the drainage easement should be fight-of-way. Right-of-way south of Sandy Lake Road is correct. 13. 14. 17. 18. 19 20. Question: Answer: Question: Question: Answer: Question: Answer: Question: Answer: Question: Answer: Question: Answer: Question: Answer: In regard to the proposed super-elevations, please provide transition stations to and from the super-elevated sections. Stationing will be added as required Is there anything to be gained by using a 3/8"/foot cross slope instead of 1/4"/foot cross slope? No, to use ~ "per/foot is standard practice and to change to ~/~"per/foot would result in a design change. What happens to the two existing driveways at approximate Station 38+107 Each property only gets 1 driveway entrance if it is residential. On Sheet 11, the proposed concrete retaining wall on the northwest side of the culvert appears a though an easement may be required. The channel easement needs to be determined and the appropriate easement added if required In regards to the proposed free right mm lane to Riverchase Drive beginning at approximately Station 48+00, please provide a curbed 100' transition. A 100' curbed transition will be provided It may be necessary to pull the western median nose back at the Sandy Lake Road/Riverchase Drive intersection to provide enough room for left tums from Riverchase Drive onto Sandy Lake Road. Please verify with turning radius templates. Noses have been placed to accommodate a WB-40 design vehicle with a 40' turning radius. They will be revised to accommodate a WB-50 design vehicle. There is a question in regard to how the existing fight-of-way was established. Please provide information on the existing right-of-way. AB&A will provide information. The proposed location of the driveway shown at approximately Station 56+10 needs to be moved so that it is in line with the proposed street right-of-way for this property. Also, provide a median opening with left turn lane at this point. A copy of the proposed plat will be provided. Driveway will be relocated based on final plat conditions. 21. 22. 23. 24. 25. 26. 27. Question: Answer: Question: Answer: Question: Answer: Question: Answer: Question: Answer: Question: Answer: Question: Answer: Will th sting Coppell entry sign located at approximately Station 57+50 be moved? In order to maintain a required 4:1 slope the toe of the slope is anticipated to impact the Coppell brick sign, which requires it to be moved. However, by waiving the 4:1 slope requirement adjacent to the sign to a 3:1 slope, the sign would not require relocating. The location of storm drainage inlets at approximately Station 65+100 needs to be moved to the west to avoid any conflicts with existing and proposed driveways. We have no plats indicating any proposed driveways. To move inlets and low points would be considered a design change. Show the proposed driveway and any other improvements associated with bridge design along the James A. Harrington property on the south side of the road. We have no plats or information indicating any proposed driveways. Additional driveway design would be considered ad_,6.'.tional design work. Improvements from bridge design shall be obtained through the County of Dallas Public Works and reflected on plan. The City would like to discuss the possibility of providing a free right lane on MacArthur to turn east on Sandy Lake Road. Also, there are a few traffic control channelization items that need to be discussed (see Sheet 17). A meeting needs to be held tofinalize a discussion on changes to the geometrics of the intersection. These changes would be considered adddtional design work. Show the 8' wide brick paver bands at all street and driveway locations. Also, show the fully brick paver intersection at MacArthur and Sandy Lake Road as per the City of Coppell Streetscape Plan and Standard Details. The requirement for Streetscape Plan at all street and driveway locations is not required in the contract and wouM be considered additional work~ The City has a concern regarding the drainage along the north side of Sandy Lake Road. Refer to comments made in cross-section sheets. Drainage will be evaluated and appropriate drainage structures included on the plans. The proposed grades of some of the proposed driveways exceed the City of Coppell's and possibly Dallas County's maximum grade. Also, there is a concern regarding the site visibility at some of the driveway locations due to grade difference &the proposed roadway and existing properties along the roadway. The grade will be adjusted to meet standards. 4 28. 29. 30. 31. 32. 33. 34. Question: ,4 nswer: Question: Answer Question: Answer: Question: Answer: Question: Answer: Question: Answer: Question: Answer: On the-drainage area map addressed: a. b. C. on Sheet 27, the following comments need to be The "C" valves for residential are high. Flow arrows need to be shown for all drainage areas. The drainage area shown at the southeast side of Sandy Lake Road needs to reflect what was discussed at an earlier meeting. The drainage areas shown at the northwest comer of Kimbel Court/Sandy Lake Road intersection is not clear. With the road to be raised higher that the existing parking lot, an offsite drainage system may be needed. a. The C value is high bemuse of the roadway_damage. b. Flow arrows will be shown c. The drainage area will be revised once a plat is submitted to SvC. d Flow arrows will be shown on drainage sheet and offsite drainage structures have been provided on plan Provide center line stationing for all storm drainage systems. Stationing will be provided for all storm drainage systems. Show profile for all storm drainage system laterals. Also, all low point inlet laterals to be minimum 21" pipe as per the City of Dallas Drainage Design Manual which has been adopted by the City of Coppell in the Subdivision Ordinance. All appropriate laterals will be a minimum of 21"Dra. at low points. Show the 100-year hydraulic grade line for all storm drainage systems. 100-year hydrauBc grade Bne will be shown. The proposed locations of the headwall on the north side of the road for drainage system line D needs to be moved so that if there is any offsite grading required the existing utility pole would not be in the way. The headwall will be moved It appears as though along the north side and possibly the south side of Sandy Lake Road there will be drainage flow parallel to the roadway. If this is to happen, please provide details and profile of proposed ditches. Also, provide limits of grading into proposed headwalls. Drainage ditches and profiles will be provided Provide concrete rip-rap erosion protection at all headwalls. Rip-Rap will be provided in accordance with Coppell's "Standard Construction Detail ". 35. Question: Show ercent grade for all storm drainage laterals. Answer: Grades will be shown on profiles. Comments from Dallas Water Utilities dated July 18, 1996 Sandy Lake Rd.. from McArthur Blvd. to Coppell E. City Limits Question: Sheet 6: The proposed paving cut of 4.5' leaves only 2.5' of cover over the existing 30" water main, which is excessively shallow. Please raise the grade between Std. 17+00 and 19+00 by a minimum of one foot. AHswer; Pavement has been designed to match the new roadway design west of this project. The water main will need to be moved. Sverdrup is not responsible for utility relocations. Question: Sheet 12: The 30" water main horizontal gate valve access manhole and bypass valve (at Std. 46+20, 20' left) will require a routine adjustment and an appurtencance adjustment to the final paving grade. Answer: A note will be added to the plans to adjust manhole and valve. Question: Sheet 12: The ongoing 60" Irving water main construction shown in the profile appears to conflict with the existing 30" DWUD water main. However, their (Irving's) plans show this 60" water main to be at a much lower elevation. Please review and provide the necessary correction. Answer: 60" water main will be reviewed and corrected if necessary. Question: Sheet 13: The 60" water main pitot manhole at paving Std. 49+70, 60' left will require an appurtenance adjustment to match the fill slope grade outside of pavement. Answer: A note will be added to the plans about adjustment. Question: Sheet 14: The 60" water main ak valve manhole and vent (at pav. Std. 55+40, 40' left) will require an appurtenance adjustment to match the fill slope grade. Answer: A note will be added to the plans. Question: Sheet 16: The recessed inlet at pav. Std. 65+30, 45' left conflicts with the access manhole for the operating nut on the 66" horizontal gate valve. Please move the sag point or use a r~t rather than a recessed inlet. The water manhole will require an~appurtenance adjustment to final grade. Answer: A regular inlet will be installed to elimimate the conflict. Question: Question" Sheet 33: The proposed 72"RCP storm drain at pav. sra. 46+00, 15' right clears the existing 60" steel water main by only 0.38 feet. On your plans, please annotate the elevation of the top of the water main as 437.6+; also add a caution note to this sheet toward the contractor of the close vertical proximity of this water transmission main. A note and elevation will be added to the plan. All paving sheets: Please show all proposed street light locations in the median so we can determine their impact on the existing 30" water main. It is our understanding that the street lights in the adjacent Sandy Lake Road project (from Denton Tap to MacArthur) utilize 24" diameter drill shafts ten feet deep, which conflicts with the existing 30" water main. The street lighting design is forth coming in the future and will be submitted as a separate package prior to the 95°4 plan submittal.