HomeMy WebLinkAbout20200574 Excelsior Park SUP Trip Generation Assessment 4-29-20 GPIEngineering I Design I Planning I Construction Management
April, 29, 2020
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 02/06/2020) 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
100room extended stay hotel and 160 residential housing units (a mix of single family, condominiums,
townhomes, and apartments). The LA Group plan is proposing 179 residential units however 155 is
being utilized as a worst case scenario, maximizing the commercial space in the mixed-use building. 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"
63 Townhomes 10 Townhomes 60 Room Hotel, which includes all
23 Apartments (includes 9 59 Apartments amenities (restaurant, spa, etc.)
short-term guest rooms) 36,200 SF Commercial*
1,400 SF Commercial*
* Since the exact breakdown of the commercial development areas is not yet known,
trip generation will be estimated for these areas using the Shopping Center land use data.
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. 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.
Greenman-Pedersen, Inc. 80 Wolf Road, Suite 300 Albany, NY 12205 p 518-453-9431
An Equal Opportunity Employer
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FIGURE 1 - PROPOSED SITE LAYOUT WITH DEVELOPMENT AREAS DEFINED FOR STUDY PURPOSES
Page 2 GPI
Existing 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 Trip
Generation Manual, 10th 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 purpose of this assessment, Land Use Code
(LUC) 220 "Multi-Family Housing — Low Rise" was used to estimate the trip generation potential of
the apartments and townhomes; LUC 310 "Hotel" was used for the hotel; and LUC 820 "Shopping
Center" was used for the commercial 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 nine short-term guest room units. There is no land use code for these
type rooms, so LUC 220 was used to approximate the trip generation potential of these
units.
• The commercial space could encompass a multitude of land uses such as restaurants,
specialty shops, banks, retail stores, office space, 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 versus apartments in the mixed use
buildings has been skewed to maximize the commercial land use, which provides the most
conservative or "worst case" estimate of trip generation.
Table 2 on the next page 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
Page 3 GPI
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 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
Development Scenario Size Enter Exit Total Enter Exit Total
Total Current Site Trips 26 81 107 86 57 143
Proposed Development Area "A" LUC 220 Multi-Family Housing 86 Units 9 32 41 33 19 52
LUC 820 Shopping Center 1.4 kSF 1 0 1 2 3 5
Total Area "A"Trip Generation 10 32 42 35 22 57
Proposed Development Area "B" LUC 220 Multi-Family Housing 69 Units 8 26 34 26 16 42
LUC 820 Shopping Center 36.2 kSF 21 13 34 66 72 138
Total Area "B"Trip Generation 29 39 68 92 88 180
Proposed Development Area "C" LUC 310 Hotel 60 Rooms 17 11 28 18 18 36
Total Area "C"Trip Generation 17 11 28 18 18 36
Total New Development Trip Generation 56 82 138 145 128 273
TABLE 3 — INTERNAL CAPTURE TRIPS
AM Peak Hour PM Peak Hour
Development Scenario Size Enter Exit Total Enter Exit Total
Internal Trip Credit with Area "A"Only (AM%/PM%) (0% /0%) 0 0 0 0 0 0
Internal Trip Credit with Area "B"Only (AM%/PM%) (0% /15%) 0 0 0 -14 -13 -27
Internal Trip Credit with Area "C"Only (AM%/PM%) (0% /0%) 0 0 0 0 0 0
Internal Trip Credit with Area "A-FB"Only (AM%/PM%) (2% /15%) -1 -1 -2 -19 -17 -36
Internal Trip Credit with Area "A-FC"Only (AM%/PM%) (0% /2%) 0 0 0 -1 -1 -2
Internal Trip Credit with Area "B-FC"Only (AM%/PM%) (2% /15%) -1 -1 -2 -17 -16 -33
Internal Trip Credit with all New Development (AM%/PM%) (2%/15%) -1 -2 -3 -22 -19 -41
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 advancing the project, while still defining which of the special
use permit improvements are triggered under each possible scenario.
Page 4 GPI
TABLE 4- ESTIMATED EXTERNAL (NEW) TRIPS FOR EXCELSIOR PARK DEVELOPMENT
AM Peak Hour PM Peak Hour
Development Scenario Size Enter Exit Total Enter Exit Total
Total External Site Trips with Only Area "A"Added to Existing 36 113 149 121 79 200
Total External Site Trips with Only Area "B"Added to Existing 55 120 175 164 132 296
Total External Site Trips with Only Area "C"Added to Existing 43 92 135 104 75 179
Total External Site Trips with Only Area "A+B"Added to Existing 64 151 215 194 150 344
Total External Site Trips with Only Area "A-FC"Added to Existing 53 124 177 138 96 234
Total External Site Trips with Only Area "B+C"Added to Existing 71 130 201 179 147 326
Total External Site Trips for Full Buildout 81 161 242 209 166 375
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?
Improvement Threshold Current Status Current A B C A+B A+C B+C Full Bld
Installation of traffic signal at the 100 Already installed(sometime before IMPROVEMENT IN PLACE
Excelsior Ave and East Ave intersection 2007)
Extend westbound left turn lane from 100'to Lane is not yet extended. Requirement
200'at the Route 50&Gick Rd/Veterans Way 100 currently waived by Planning Board for Waived YES YES YES YES YES YES
intersection Phase II development.
Construct northbound right turn lane on
150 Lane has not yet been constructed. no YES YES YES YES YES YES YES
Veterans Way at its intersection with Route 50
Stop signs already installed.
Traffic calming measures at the Excelsior
Springs Ave and Victoria Ln/Audrey Ln 200 Some curbing in place,but notfully. no YES YES no YES YES YES YES
Crosswalk not yet striped.
intersection
Concrete pad not yet installed.
Installation of a traffic signal at the
250 Currently configured as an All-Way Stop. no no YES no YES no YES YES
Excelsior Ave and Marion Ave intersection
Additional traffic analysis was conducted
Follow-up traffic analysis,which may trigger after Phase II development at Veterans
250 no no YES no YES no YES YES
modification to the mitigation requirements Way/ExcelsiorAve intersection and
Route 50/Veterans Way Intersection.
Intersection is currently Al I-Way Stop,
Widen Veterans Way at ExcelisiorAve to
300 but lane widening has not yet been no no no no YES no YES YES
provide a southbound right turn only lane
done.
In Phase II,construct paved ped./bike path
0 Completed YES YES YES YES YES YES
from projects main Street to Spring Run Trail
Page 5 GPI
Summary
Upon full build out of the land uses presented in the 02/06/2020 LA Group site plan for Excelsior
Park, it's estimated a total of a total of 375 PM peak hour trips would be generated. These 375 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.
7/1~4117,:ea-,/ a
Michael R. Wieszchowski, P.E., PTOE
Sr. Traffic Engineer
Peter Faith, P.E.
Vice President
Encl.
Cc: Dave Carr; LA Group
Page 6 GPI