2575&2585 S Winchester Supplemental Memo Revised
505 17th Street, 2nd Floor Oakland, CA 94612 510.444.2600 w-trans.com
SANTA ROSA • OAKLAND • SAN JOSE
Memorandum
Date: October 28, 2020 Project: CMP033
To: Matthew Jue, P.E.
City of Campbell
From: Kenny Jeong
kjeong@w-trans.com
Mark Spencer
mspencer@w-trans.com
Subject: 2575/2585 South Winchester Blvd – Revised Trip Generation/Distribution Estimates
The purpose of this memorandum is to document the potential changes in trip generation, distribution and
assignment associated with a revised project description for the proposed mixed-use development located at
2575/2585 Winchester Boulevard in Campbell.
Updated Project Description
The project description was revised and now proposes to demolish two existing single-family homes and
construct 15 new multifamily residential units and 2,185 square feet of ground floor retail space. The revised
project description does not alter the residential component of the project but changes the proposed ground
floor use from 600 square feet of office to 2,185 square feet of commercial retail.
Updated Trip Generation
The anticipated trip generation for the proposed project was estimated using standard rates published by the
Institute of Transportation Engineers (ITE) in Trip Generation Manual, 10th Edition, 2017 for “Multifamily Housing
(Mid-Rise)” (ITE LU #221) and “Shopping Center” (ITE LU #820). Because the site is currently occupied by two single-
family homes, the trip generation for “Single Family Detached Homes” (ITE LU #210) were used to estimate the
existing trips at the site.
The project would be located within 1,500 feet of the Winchester Light Rail Station, and it would be reasonable to
assume that some residents would want to walk or ride a bicycle to this station. However, to provide a
conservative analysis, no trip reductions resulting from nearby transportation options or mixed-use development
were assumed. Similarly, reductions attributable to internal capture, pass-by or any other trip reductions were not
applied.
The expected trip generation potential for the proposed project is indicated in Table 1. The proposed project is
expected to generate an average of 145 net-new trips per day, including 6 trips during the a.m. peak hour and 13
during the p.m. peak hour; these net-new trips represent the increase in traffic associated with the project.
Compared to the project as previously proposed, this represents an increase of 71 daily trips, three a.m. and nine
p.m. peak hour trips.
Mr. Matthew Jue, PE Page 2 October 28, 2020
Table 1 – Trip Generation Summary
Land Use Units Daily AM Peak Hour PM Peak Hour
Rate Trips Rate Trips In Out Rate Trips In Out
Existing
Single Family Detached
Housing
-2 du 9.44 -19 0.74 -1 0 -1 0.99 -2 -1 -1
Proposed
Multifamily Residential (Mid-
Rise)
15 du 5.44 82 0.36 5 1 4 0.44 7 4 3
Shopping Center 2.185 ksf 37.75 82 0.94 2 1 1 3.81 8 4 4
TOTAL 145 6 2 4 13 7 6
Note: du = Dwelling Unit, ksf = 1,000 square feet, N/A = Not Available
Updated Trip Distribution
Plots illustrating the prevailing travel patterns in the study area from the Santa Clara County Travel Demand Model
outputs were used to estimate relative trip distribution patterns within the study area, by comparing relative
vehicle demands on major roadways surrounding the study area. It should be noted that trips were assumed to
use surface streets (such as South Winchester Boulevard and Camden Avenue) to access regional facilities (like SR
17 and San Tomas Expressway). The applied distribution assumptions (with manual adjustments for rounding)
and resulting trips are shown in Table 2.
Table 2 – Trip Distribution Assumptions
Route Percent Daily AM Trips PM Trips
To/From North via San Tomas Expressway 30% 44 2 4
To/From South via San Tomas Expressway 40% 57 3 5
To/From North via Winchester Boulevard 6% 9 0 1
To/From South via Winchester Boulevard 18% 26 1 2
To/From West via Budd Avenue 6% 9 0 1
TOTAL 100% 145 6 13
Roadway Vehicle Counts for Air Quality Analysis
The average daily traffic (ADT) on several surrounding street segments was determined based on 24-hour counts
conducted on a typical weekday while schools were in session. These counts were conducted on Wednesday,
October 2, 2019, on multiple roadway segments within the study area. The daily volumes obtained from these
counts and the project-added trips for each roadway are summarized in Table 3.
Mr. Matthew Jue, PE Page 3 October 28, 2020
Table 3 – Daily Traffic
Roadway Segment ADT Project
Trips
Total
1. S. Winchester Blvd (just north of Friar Way) 25,199 60 25,259
2. Camden Ave (Between Winchester Blvd and Timber Cove Dr) 1,989 29 2,018
3. Budd Ave (Between Winchester Blvd and California St) 5,450 30 5,480
4. San Tomas Expressway at Winchester Blvd 56,371 28 56,399
Note: ADT = Average Daily Traffic
Change in Vehicle Miles Traveled
Consideration was given to the revised project’s potential generation of Vehicle Miles Traveled (VMT). The City of
Campbell adopted a VMT policy in August 2020. According to this policy, all proposed land uses located within
one-half mile of a light-rail station shall be presumed to have a less-than-significant transportation impact on VMT
presuming these projects are consistent with the General Plan. This policy also states that local-service retail
projects comprised of stores with up to 60,000 gross square feet shall be presumed to have a less-than-significant
transportation impact.
The proposed project at 2575/2585 South Winchester Boulevard is presumed to have a less-than-significant
impact on VMT for two reasons: it would be located within one-half mile of the existing Winchester light-rail
station; and the proposed project’s retail component is less than 60,000 square feet.
Finding – The project would have a less-than-significant transportation impact on vehicle miles traveled.
Conclusion
The nominal increases in a.m. and p.m. peak hour volumes associated with the change in project description for
the proposed project are not anticipated to alter the intersection level of service, signal warrant analysis or left-
turn lane evaluation finding and conclusions as documented in the 2575/2585 South Winchester Boulevard
Transportation Impact Analysis (dated October 27, 2020). Therefore, updates to these components of the
Transportation Impact Analysis are not necessary.
Thank you for giving W-Trans the opportunity to provide these services. Please call if you have any questions.
MES/kbj/CMP033.M1
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