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Home My WebLink About20200574 Excelsior park SUP Trip Generation Assessment Rev 11-3-17 G�� Engineering I Design � Planning I Construction Management November 3, 2017 Mr. John Witt Witt Construction Inc. 563 North Broadway Saratoga Springs, NY 12966 RE: Excelsior Park Trip Generation Update and Special Use Permit Evaluation (revised) Saratoga Springs, New York; GPI project# ALB 2017119.00 Dear Mr. Witt: Greenman-Pedersen, Inc. (GPI) has reviewed the current proposed site plan for the build out of Excelsior Park (dated 10/5/2017) prepared by the LA Group to estimate traffic generating potential of the land use being proposed. These trip generation estimates were then compared to the traffic mitigation thresholds as contained in the Special Use Permit was granted by the City of Saratoga Springs for this project in October 2002. Currently, Excelsior Park Phase I has been constructed and Phase II has been approved and is under construction. With Phase I and Phase II the site will contain a 100 room extended stay hotel and 160 residential housing units (a mix of single family, condominiums, townhomes, and apartments). The proposed build-out on the current LA Group site plan will add 147 additional housing units (split between townhomes, apartments and townhomes with attached apartments), 36,200 square feet of commercial space, and a 60 room hotel with supporting restaurant, spa and other amenities. A copy of the current Site Plan is attached for reference. For the trip generation assessment, the new development on-site was broken down into three separate areas that could be constructed all at once or in phases. These areas, which are graphically depicted in Figure 1 on the next page include the following proposed land uses: Area "A" Area "B" Area "C" 52 Townhomes 10 Townhomes 60 Room Hotel, which includes all 24 Apartments (includes six 61 Apartments amenities (restaurant, spa, etc.) short-term guest rooms) 36,200 SF Commercial* * Since the exact breakdown of this commercial development area is not yet known, trip generation will be estimated for this area under the Shopping Center land use. In addition to these areas, the site contains a fourth area, which is the already constructed and previously approved development from Phases I and II of the site construction. As will be discussed subsequently, the trips generated by this previously approved land uses will be added to the trips estimated for each of the new development areas noted above to estimate the trip generation potential for the build out of the site. 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IL I I � � ��c , 1- �� I � � �� _� �, � �, � �� '� --a � � 0 1 , c� �' , , � . � � � , 1 . � '� , ; �. � FIGURE 1— PROPOSED SITE LAYOUT WITH DEVELOPMENT AREAS DEFINED FOR STUDY PURPOSES Page � .�� — Existina Site Traffic As part of a previous study GPI performed for this site, Traffic counters were placed along the site access road from May 7 to May 15, 2015 to determine the existing trip generation of the site with Phase I development in place. Additionally, the trip generation potential of Phase II site development was detailed in a June 10, 2015 Traffic Generation Analysis letter. These volumes, as detailed in the previous study, will be used as the existing condition base for the overall trip generation of the site in all development scenarios presented. These existing site trips are as shown in Table 1 below. TABLE 1 — EXISTING SITE TRIPS AM Peak Hour PM Peak Hour Development Enter Exit Total Enter Exit Total Phase I Development 13 26 39 27 26 53 Phase II Development 13 55 68 59 31 90 Total Existing and/or 26 81 107 86 57 143 Approved Site Trips Trip Generation Estimates of Current Proposal The current standard for estimating trips being generated by a particular development is the T� Generation Manual, 9th edition, published by the Institute of Transportation Engineers (ITE). This publication offers average rates and equations based on hundreds of case studies to estimate the trip generation potential of various land uses. For the purposes of this assessment, Land Use Codes (LUC) 220 "Apartments"; LUC 230 "Townhouses"; LUC 310 "Hotel"; and LUC 820 Shopping Center were used to forecast the additional peak hour trips that would be generated by each of the future development areas. For this analysis the following is noted: • The spa, restaurant, community space, meeting rooms and other amenities included in the proposed hotel are all considered within the LUC 310 land use and are not estimated separately. • Area "A" includes six short-term guest room units. There is no land use code for these type rooms, so LUC 220 "Apartments" was used to approximate the trip generation potential of these units. • The commercial space in the mixed use building in area "B" could encompass a multitude of land uses such as restaurants, specialty shops, banks, retail stores, etc., but this has not yet been defined. As such, it is being estimated under the catch-all land use for commercial development, Shopping Center (LUC 820), which by definition may include any or all of these individual land uses. • Additionally, the estimated ratio of commercial space in this mixed use building has been maximized to provide a conservative or"worst case" estimate of trip generation. Table 2 below summarizes the trip generation potential for each of the future development areas. It should be noted that Table 2 represents the Gross number of trips before any adjustments are made to account for trips that remain internal to the site. As discussed in ITE's Trip Generation Handbook, development with multiple land uses will tend to capture some trips internal to the site, where one user may visit 2 or more of the land uses within. The handbook defines a procedure to Page 3 �� estimate the number of trips internally captured based on the land uses and their sizes on site. Using these procedures, internal capture rate percentages were calculated for each of the development scenarios. These percentages and the resulting number of trips, which will be subtracted from the trip generation totals to define the number of trips external to the site, are shown in Table 3. TABLE 2 — NEW DEVELOPMENT TRIP GENERATION AM Peak Hour PM Peak Hour DevelopmentScenario Land Use Size Enter Exit Total Enter Exit Total Proposed DevelopmentArea "A" LUC220 Apartments 24 Units 2 10 12 10 5 15 LUC 230 Townhouse/Condo 52 Units 4 19 23 18 9 27 Total Area "A"Trip Generation 6 29 35 28 14 42 Proposed DevelopmentArea "B" LUC220 Apartments 61 Units 6 25 31 25 13 38 LUC 230 Townhouse/Condo 10 Units 1 3 4 3 2 5 LUC 820 Shoppi ng Center 36.2 kSF 22 13 35 47 51 98 Total Area "B"Trip Generation 29 41 70 75 66 141 Proposed Development Area "C" LUC 310 Hotel 60 Rooms 19 13 32 18 18 36 Total Area "C"Trip Generation 19 13 32 18 18 36 Total New Development Trip Generation 54 83 137 121 98 219 TABLE 3 —INTERNAL CAPTURE TRIPS Internal AM Peak Hour PM Peak Hour DevelopmentScenario CaptureRate Enter Exit Total Enter Exit Total Internal Trip Creditwith Area "A"Only (AM%/PM%) (0%/0%) 0 0 0 0 0 0 Internal Trip Creditwith Area "B"Only (AM%/PM%) (0%/15%) 0 0 0 -11 -10 -21 Internal Trip Creditwith Area "C"Only (AM%/PM%) (0%/0%) 0 0 0 0 0 0 Internal Trip Creditwith Area "A+B"Only (AM%/PM%) (2%/15%) -1 -1 -2 -15 -12 -27 Internal Trip Creditwith Area "A+C"Only (AM%/PM%) (0%/2%) 0 0 0 -1 -1 -2 Internal Trip Creditwith Area "B+C"Only (AM%/PM%) (2%/15%) -1 -1 -2 -14 -13 -27 Internal Trip Credit with all New Development (AM%/PM%) (2%/15%) -1 -2 -3 -18 -15 -33 Combining the existing site trips with the trip generation potential of the new development and subtracting the internally captured trips results in the number of new trips external to the site and distributed onto the roadway network. These external trips, which are the trips to be used when considering the improvement requirements of the special use permit, are included in Table 4. It should be noted that this table breaks down the potential new development into several scenarios to allow the design team flexibility in project, while still defining which of the special use permit improvements are triggered under each possible scenario. Page 4 �� TABLE 4— ESTIMATED EXTERNAL (NEW) TRIPS FOR EXCELSIOR PARK DEVELOPMENT AM Peak Hour PM Peak Hour Development Scenario Enter Exit Total Enter Exit Total Total External Site Trips with Only Area "A"Added to Existing 32 110 142 114 71 185 Total External Site Trips with Only Area "B"Added to Existing 55 122 177 150 113 263 Total External Site Trips with Only Area"C"Added to Existing 45 94 139 104 75 179 Total External Site Trips with Only Area "A+B"Added to Existing 60 150 210 174 125 299 Total External Site Trips with Only Area"A+C"Added to Existing 51 123 174 131 88 219 Total External Site Trips with Only Area "B+C"Added to Existing 73 134 207 165 128 293 Total External Site Trips for Full Buildout of All Areas(A+B+C)Added to 79 162 241 189 140 329 Existing Special Use Permit Improvement Requirements The special use permit put in place when Excelsior Park was first approved by the City of Saratoga Springs in 2002 listed several requirements for roadway improvements that would be triggered as different trip generation thresholds were reached by Excelsior Park. Table 5 lists the improvement requirements of the special use permit, the trigger threshold and current status for each improvement and whether a particular improvement is warranted under each of the development scenarios. TABLE 5 —SPECIAL USE PERMIT TRAFFIC MITIGATION IMPROVEMENT REQUIREMENTS Trigger Development Options-Improvement Triggered? Im rovement hreshold Current Status Current A B C A+B A+C B+C Full Bld Installationoftrafficsignalatthe 1� Alreadyinstalled(sometimebefore IMPROVEMENTINPLACE ExcelsiorAve and EastAve intersection 2007) Extend westbound leftturn lane from 100'to Lane is notyetextended. Requirement 200'atthe Route 50&Gick Rd/Veterans Way 100 currently waived by Planning Board for Waived intersection Phase II development. Constructnorthbound rightturn lane on 150 Lane has not yet been constructed. no Veterans Way at its intersection with Route 50 Traffic calming measures atthe Excelsior Stop signs already installed. Some curbing in place,but notfully. Springs Ave and Vidoria Ln/Audrey Ln 200 no no no Crosswalk notyetstriped. intersection Concrete pad notyet installed. Installation of a traffic signal at the 250 Currently configured as an All-Way Stop. no no no no ExcelsiorAve and Marion Ave intersection Additional traffic analysis was conducted Follow-uptrafficanalysis,which maytrigger afterPhase II developmentatVeterans 250 no no no no modification to the mitigation requirements Way/ExcelsiorAve intersedion and Route 50/Veterans Way Intersection. Intersection is currently AI I-Way Stop, Widen Veterans Way at ExcelisiorAve to 300 but lane widening has not yet been no no no no no no no provide a southbound rightturn only lane done. In Phase II,construd paved ped./bike path from projeds main Street to Spring Run Trail 0 Completed Page 5 �� Summarv Upon full build out of the land uses presented in the 10/5/2016 LA Group site plan for Excelsior Park, it's estimated a total of a total of 329 PM peak hour trips would be generated. These 329 peak hour trips do meet volume thresholds for all the traffic mitigation requirements conditions listed in the 2002 special use permit. Given the time since the preparation of special use permit and the recent development in the corridor, it would seem to be appropriate to revisit the 2002 Special Use Permit to see if the traffic mitigation improvements listed are still applicable. If you have any questions or need additional information, please give us a call. Sincerely, GPI/Greenman-Pedersen, Inc. ��. _ Michael R. Wieszchowski, P.E., PTOE Sr. Traffic Engineer -., �� Peter Faith, P.E. Vice President Cc: Dave Carr; LA Group Enclosure: Site Plan, October 2002 Special Use Permit Page 6 ��