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Riverchase(1)-CS 931228 (2) MEMORANDUM To: Taryon Bowman, Planning and Zoning Coordinator From: Kenneth M. Griffin, P.E., City Engineer ~ RE: Engineering Comments for 12/28/93 and 1/6/94 Date: December 28, 1993 1. Lakewood Estates Replat. Lots 1-15. Block D, located east of Village Parkway, along the north side of Basilwood Drive, at the request of Unzicker, Schnurbusch &Associates, Inc. 1. Why is this being submitted? What has changed on the approved plat? 2. Minimum finish floor should be provided for lot 15R, Block D. 3. The floodplain administrator signature block should be provide. '1. When is a replat going to tx: submitted that rcviscs thc floodplain on ail thc lots on thc east sidc of this subdivision that arc adjacent to Denton Crock? __ 2. Riverchase Club Apartments (Plan A} Preliminary Plat, located along the northwest corner of Beltline Road and MacArthur Blvd., at the request of Nathan Maier Consulting Engineers Inc. 1. Five foot wide sidewalks should be provided on MacArthur Blvd. 2.Thc Firc Department should be asked whcthcr or not trucks can madc thc turn at thc north end of thc apartment complex in thc fire lane. 2. The following comment pertains to the traffic study for the Riverchase Club Apartments. These comments apply to both Plan 33 and B. It is my understanding that revisions to the study will be submitted to be included with the P&Z packets. However, I will not have time to review it prior to my comments being due. Any changes to these comments will be addressed at the P&Z meeting. a.. All exact calculations and copies of any publications referenced in this study should be provided with the study. b. Please comment why the trip generation for multi-family low rise apartments code 221 was used in lieu of 220. c. Please comment on who at city staff provided the trip orientation of the site generated traffic. The City is very concerned about the projected 20% to go to the east. This is assumed to go down Riverchase Drive. d. 1995 should be considered the base year study. There should also be a future year study provided. e. Your comments are that currently Riverchase Dr. experiences Level E service in the a.m. and Level F service in the p.m. Please respond as to what is the actual time delay was on the a. m and the p.m. Did you actually perform a delay study to arrive at those times? As an observation, if the intersections are already operating at Level E and F why would it be prudent to include an additional 1850 vehicles per day through an intersection which can't handle the current traffic? Also, the City has already approved final plats for subdivisions along Riverchase Drive that total 430 lots. As of December, 1993, permits had only been issued for 87 lots. Of the 87 lots very few are occupied at this time. Even with that small amount developed, that has already been approved by Council, your report states that the level of service is already unacceptable getting off of Riverchase onto MacArthur Blvd. What will the level of service be in the future when the additional 343 building permits are issued and all 430 homes are occupied and when the proposed 280 units directly across the intersection are constructed? L Please respond on how signalization will help the intersection of Riverchase and MacArthur Blvd. g. You have a comment in your study that says vehicles will queue on the minor roadway and will not affect the flow of traffic on the major roadways. This might be fine for the major roadways but how are the people on the minor roadways, i.e., Riverchase Dr. and the driveway for this development, going to get onto the major roadway? Again, your study shows that the level of service is already at Level E & F. h. Your comments state that the signal timing at MacArthur and Beltline could be retimed to allow more green time for southbound MacArthur during the a.m. peak hours. Please comment on what effect this will have on the Beltline Road traffic. i. Your study states that the actual average speed on MacArthur Blvd. is 40 mph. Our speed study shows that the average speed limit is 38 mph and 85th percentile speed is 42 mph. This speed survey was performed in August, 1993. According to our ordinances, the desirable intersection sight distance on this roadway would be 450 feet, not 275 feet. Both driveways should be evaluated to see if they can obtain the desirable intersection sight distance. If the northern driveway is pursued, a sight visibility easement should be shown on the plat that would restrict or prohibit any encroachments, including heavy landscaping taller than 2 1/2 feet. j. Please comment as to why the traffic distribution has changed from what is currently existing on MacArthur Blvd. Currently, approximately 89% of the vehicles are south bound in the a.m. and approximately 11% are north bound. However, on your site distribution you are showing 35 % north bound and 65 % south bound. Also, please comment why your p.m. directional split has been changed. k. The City is very concerning about the impact this development will have on an already congested roadway. Therefore, the City would request that new counts and turning movements be provided for the Beltline/MacArthur and the Riverchase/MacArthur intersections so that a level of service for today, i.e., January, 1994, when this department comes on line, i.e., 1995, and for future conditions can be determined. The level of service with and without the development should be identified at each intersection. 1.The ultimate traffic volume on MacArthur Blvd. should be projected and shown with the study. m. Various solutions to better the level of service should be evaluated. These should include, but not be limited to: evaluating the traffic light operation at MacArthur/Belfline; widening MacArthur from four to six lanes between Riverchase and Beltline; installing a traffic light at RiverchasedMacArthur and constructing Fairway Drive. You should also evaluate any addition solutions which may become apparent during the course of performing the traffic study. 3. Riverchase Club Apartments (Plan B). Preliminary Plat, located along the northwest corner of Beltline Road and MacArthur Blvd. at the request of Nathan D. Maier Consulting Engineers Inc.. 1. Five foot wide sidewalks are required on MacARthur Blvd. Four foot wide sidewalks are required on Riverchase Drive. 2. Thc Fire Department should be asked whether or not trucks can make thc turn at thc north end of the apartment complex in thc fire lane. 2. Even though the driveways on Riverchase Drive may be private, the volume they carry will make them function as streets. Therefore, the centerline should be offset by 125 feet or the driveways should be lined up. This affects the two middle driveways. 3. How much more traffic will the extension of Riverchase Drive put on the intersection of Riverchase and MacArthur Blvd. Already the intersection is operating at a very poor level of service. '=- :~ -'~-- ' ~ ~' ~ DO BOx 478 ~---~' ~.--':'~" --~'-~. ~l'.-~:=~:~/~--j' C, ool3ell Texas ,~ /~ . T~e C;ty W.tn A Beautdul Future 214-~2~22 ~ ~ ,~ F~ m. 2t~139~ PI.EASE DELZYE~ TIlE FOI23~/ZNG PAGES TO: