Appendix K
Local Transportation Analysis
LOCAL TRANSPORTATION ANALYSIS
PACIFIC PROJECT
San Marcos, California
February 16, 2023
LLG Ref. 3-20-3279
Prepared by: Under the Supervision of:
Román Lopez, PTP John Boarman, P.E.
Senior Transportation Planner Principal
&
Alejandra Alonso
Transportation Engineer I
LINSCOTT, LAW & GREENSPAN, engineers LLG Ref. 3-20-3279 Pacific Project
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EXECUTIVE SUMMARY
Linscott, Law & Greenspan, Engineers (LLG) has prepared the following Local Transportation Analysis (LTA) to determine and ev aluate the potential effects to the local roadway system due to the proposed Pacific project (proposed Project). The Project site is located at the northwest corner of the Linda Vista Drive / Las Posas Road intersection in the City of San Marcos. The Project site is currently undeveloped.
The Project consists of 449 resi dential units, including a mix of apartments within a five-story podium building, th ree-story rowhomes, three-st ory villas, and affo rdable flats within a four-story building on approximately 15.09 acres within the 33.2-acre Project site. The Project proposes a General Plan Amendment, Rezo ne, Specific Plan, Tentativ e Map, and Mult i-Family Site Development Plan. The General Plan Amendment and Rezone would change the General Plan designation and Zoning from Industrial (I) to Specific Pl an Area (SPA).
The Project is calculated to generate a total of 2,694 ADT with 216 AM peak hour trips (43 inbound / 173 outbound) and 242 PM peak hour trips (169 inbound and 73 outbound).
While Level of Service (LOS) analysis is not used to determine CEQA significance, the intersection and segment analysis provided in this study shows th at the Project will have a substantial effect on study area facilities, including two (2) study area intersections and one (1) study area street segment, according to the City of San Marcos LOS Standard s. Roadway improvements are identified for each location that will increase performance to acceptable and/or pre-project conditions.
LINSCOTT, LAW & GREENSPAN, engineers LLG Ref. 3-20-3279 Pacific Project
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TABLE OF CONTENTS
SECTION PAGE
1.0 Introduction ................................................................................................................................ 1
2.0 Project Description .................................................................................................................... 2
2.1 Project Location .................................................................................................................. 2
2.2 Project Description .............................................................................................................. 2
3.0 Existing Conditions .................................................................................................................... 7
3.1 Existing Street Network ...................................................................................................... 8
3.2 Existing Traffic Volumes .................................................................................................... 9
3.2.1 Data Collection ....................................................................................................... 9
3.2.2 COVID-19 Restrictions/Limitations ....................................................................... 9
3.2.3 Traffic Volume Adjustment .................................................................................. 10
4.0 Local Transportation Analysis Approach and Methodology .............................................. 14
4.1 Study Scenarios ................................................................................................................. 14
4.2 Methodology ..................................................................................................................... 14
4.2.1 Intersections .......................................................................................................... 14
4.2.2 Street Segments ..................................................................................................... 15
4.3 Level of Service Standards ............................................................................................... 15
5.0 Analysis of Existing Conditions .............................................................................................. 16
5.1 Peak Hour Intersection Levels of Service ......................................................................... 16
5.1.1 Intersection LOS ................................................................................................... 16
5.1.2 Intersection Queuing ............................................................................................. 16
5.2 Daily Street Segment Levels of Service ........................................................................... 16
6.0 Near-Term (Interim Year 2025) Conditions ......................................................................... 22
6.1 Network Conditions .......................................................................................................... 22
6.2 Near-Term (Interim Year 2025) Traffic Volumes ............................................................ 22
7.0 Trip Generation/Distribution/Assignment ............................................................................ 24
7.1 Trip Generation ................................................................................................................. 24
7.1.1 Trip Rates .............................................................................................................. 24
7.1.2 Project Trips .......................................................................................................... 24
7.2 Trip Distribution and Assignment .................................................................................... 25
8.0 Analysis of Near-Term Scenarios ........................................................................................... 31
8.1 Near-Term Without Project .............................................................................................. 31
8.1.1 Intersection Analysis ............................................................................................. 31
8.1.2 Intersection Queuing ............................................................................................. 31
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8.1.3 Segment Operations .............................................................................................. 32
8.2 Near-Term + Project ......................................................................................................... 32
8.2.1 Intersection Analysis ............................................................................................. 32
8.2.2 Intersection Queuing ............................................................................................. 32
8.2.3 Segment Operations .............................................................................................. 33
9.0 Horizon Year (Year 2050) Conditions ................................................................................... 39
9.1 Horizon Year (Year 2050) Network Conditions ............................................................... 39
9.2 Horizon Year (Year 2050) Traffic Volumes ..................................................................... 39
10.0 Analysis of Horizon Year Scenarios ....................................................................................... 42
10.1 Long-Term Without Project .............................................................................................. 42
10.1.1 Intersection Analysis ............................................................................................. 42
10.1.2 Intersection Queuing ............................................................................................. 42
10.1.3 Segment Operations .............................................................................................. 43
10.2 Long-Term + Project ........................................................................................................ 43
10.2.1 Intersection Analysis ............................................................................................. 43
10.2.2 Intersection Queuing ............................................................................................. 43
10.2.3 Segment Operations .............................................................................................. 44
11.0 Site Access, On-Site Circulation, and Parking ...................................................................... 50
11.1 Site Access ........................................................................................................................ 50
11.2 On-Site Circulation ........................................................................................................... 50
11.3 Parking .............................................................................................................................. 50
12.0 Active Transportation Review ................................................................................................ 51
12.1 Existing Bicycle Network ................................................................................................. 51
12.2 Proposed Bicycle Network ............................................................................................... 51
12.3 Existing Pedestrian Conditions ......................................................................................... 51
12.4 Proposed Pedestrian Conditions ....................................................................................... 52
12.5 Existing Transit Conditions .............................................................................................. 52
12.6 Recommendations ............................................................................................................. 53
13.0 Conclusions ............................................................................................................................... 56
13.1 Active Transportation Recommendations ......................................................................... 56
13.2 Site Access Recommendations ......................................................................................... 56
13.3 Intersection and Roadway Operations Analysis Results .................................................. 56
13.4 Intersection and Roadway Improvements ......................................................................... 57
13.5 Traffic Signal Warrants ..................................................................................................... 65
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APPENDICES
APPENDIX
A. Intersection and Segment Count Sheets
1. Year 2021 Counts
2. Year 2017 Counts
B. Scoping Memo and City Review
C. City of San Marcos Roadway Classification Table
D. Existing Analysis Worksheets
E. Existing Queueing Analysis Worksheets
F. K&D Factors Definitions
G. Near-Term Analysis Worksheets
H. Near-Term Queueing Analysis Worksheets
I. Near-Term + Project Analysis Worksheets
J. Near-Term + Project Queueing Analysis Worksheets
K. Long-Term Analysis Worksheets
L. Long-Term Queueing Analysis Worksheets
M. Long-Term + Project Analysis Worksheets
N. Long-Term + Project Queueing Analysis Worksheets
O. Near-Term + Project & Long-Term + Project Improvements Analysis Worksheets P. Signal Warrant Worksheets
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LIST OF FIGURES
SECTION—F IGURE # P AGE
Figure 2–1 Vicinity Map ................................................................................................................... 4 Figure 2–2 Project Area Map ............................................................................................................ 5 Figure 2–3 Project Site Plan .............................................................................................................. 6 Figure 3–1 Existing Conditions Diagram ........................................................................................ 12 Figure 3–2 Existing Traffic Volumes .............................................................................................. 13 Figure 6–1 Near-Term without Project Traffic Volumes ................................................................ 23 Figure 7–1a Project Traffic Distribution ....................................................................................... 26 Figure 7–1b Project Driveway Traffic Distribution ...................................................................... 27 Figure 7–2a Project Traffic Volumes ............................................................................................ 28 Figure 7–2b Project Driveway Traffic Volumes ........................................................................... 29 Figure 7–3 Near-Term + Project Traffic Volumes .......................................................................... 30 Figure 9–1 Long-Term without Project Traffic Volumes ............................................................... 40 Figure 9–2 Long-Term + Project Traffic Volumes ......................................................................... 41 Figure 12–1 Bicycle Network ........................................................................................................ 54 Figure 12–2 Pedestrian Network ................................................................................................... 55
LINSCOTT, LAW & GREENSPAN, engineers LLG Ref. 3-20-3279 Pacific Project
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LIST OF TABLES
SECTION—T ABLE # P AGE
Table 3–1 Existing Traffic Volumes ................................................................................................... 11 Table 5–1a Existing Intersection Operations ...................................................................................... 18 Table 5–1b Existing Intersection Queuing ......................................................................................... 19 Table 5–2 Existing Street Segment Operations .................................................................................. 21 Table 7–1 Project Trip Generation ..................................................................................................... 24 Table 8–1a Near-Term Intersection Operations ................................................................................. 34 Table 8–1b Near-Term Intersection Queuing ..................................................................................... 36 Table 8–2 Near-Term Street Segment Operations .............................................................................. 38 Table 10–1a Long-Term Intersection Operations ............................................................................... 45 Table 10–1b Long-Term Intersection Queuing .................................................................................. 47 Table 10–2 Long-Term Street Segment Operations ........................................................................... 49 Table 13–1 Near-Term Post Improvement Intersection Analysis ...................................................... 60 Table 13–2 Long-Term Post Improvement Intersection Analysis ...................................................... 61 Table 13–3 Post-Improvement Queuing: Las Posas Rd / La Mirada Dr ............................................ 62 Table 13–4 Near-Term Post-Improvement Street Segment Operations ............................................. 63 Table 13–5 Long-Term Post-Improvement Street Segment Operations ............................................ 64 Table 13–6 Warrant 3: Peak Hour – Near-Term with Project Linda Vista Drive / S. Pacific Street . 66
LINSCOTT, LAW & GREENSPAN, engineers LLG Ref. 3-20-3279 Pacific Project
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1 LOCAL TRANSPORTATION ANALYSIS
PACIFIC PROJECT
San Marcos, California
February 16, 2023
1.0 INTRODUCTION
Linscott, Law & Greenspan, Engineers (LLG) has prepared the following Local Transportation Analysis (LTA) for the proposed Pacific project (pr oposed Project) located at the northwest corner of the Linda Vista Drive / Las Posas Road intersection in the City of San Marcos.
Transportation impact analyses within the City of San Marcos includes two sets of requirements:
CEQA Analysis primarily consisting of vehicle miles traveled (VMT) analysis. Non-CEQA Local Transportation Analysis to evaluate the effects of a development project on the circulation network.
CEQA VMT analysis is provided under separate cover.
The following items are included in this transportation study:
Project Description
Existing Conditions Discussion
Local Transportation Analysis Approach and Methodology Analysis of Existing Conditions
Near-Term Conditions Discussion
Trip Generation, Distribution, and Assignment
Analysis of Near-Term Scenarios
Long-Term Conditions Discussion
Analysis of Long-Term Scenarios
Site Access, Circulation, and Parking Review
Active Transportation Review
Conclusions
LINSCOTT, LAW & GREENSPAN, engineers LLG Ref. 3-20-3279 Pacific Project
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2 2.0 PROJECT DESCRIPTION
2.1 Project Location
The 33.2-acre project site is an infi ll site located in the western po rtion of the City of San Marcos (City), at the northwest corner of Las Posas Road and Linda Vista Drive, and comprises Assessor’s Parcel Numbers (APNs) 219-222-01, 219-222- 02, 219-222-03, and 219-222-04. La Mirada Road abuts the site’s northern boundary, while South Pacific Street abuts the property’s western boundary.
The Grand Plaza shopping center is located directly across Las Posas Road to the east. Light industrial uses are adjace nt to the sites northern, southern, and western boundary, and Bradley Park is located across from the site’s southwestern corn er. Single- and multi-family residential uses are located to the west and south of Bradley Park.
Figure 2–1 shows the vicinity map. Figure 2–2 shows a more detailed project area map.
2.2 Project Description
The project consists of 449 residential units, incl uding a mix of apartments, rowhomes, villas, and affordable flats on approximately 15.09 acres of th e 33.2-acre project site. Proposed residential units would include a mix of apartments within a fi ve-story podium buildi ng, three-story rowhomes, three-story villas, and affordable flats within a four-sto ry building. The projec t includes a total of 927 parking spaces and 134,985 square feet of common open space area. 68 of the 449 total units (15 percent of the total) would be designated as deed-restricted affordable units (alternatively, the project reserves the option to contribute to the affordable housing fund by paying the in-lieu fee).
The proposed project also includes landscaping, bio -retention areas, and circ ulation improvements.
The remaining approximately 17.94 acres of the 33.2-acre project site would be preserved and restored as open space and habitat area. The proposed project would have a density of approximately
13.5 dwelling units per acre, including the open space and habitat area.
The project proposes a General Pl an Amendment, Rezone, Specific Plan, Tentative Map, and Multi- Family Site Development Plan. The General Plan Amendment and Rezone would change the General Plan designation and Zoning from Industrial (I) to Specific Plan Area (SPA). The Specific Plan has been prepared with the intent to prov ide a comprehensive plan to ensure the efficient development of a new residentia l community. The Specific Plan se rves as both a policy document and a regulatory document for the systematic implementation of the policies and goals of the General Plan. The Tentative Map presents specific lot configurations for the site. The Multi-Family Site Development Plan will config ure the site for multi -family dwelling units, street configuration, infrastructure, recreational open space, and private open space.
As part of the project, additi onal pedestrian connectivity would be provided along three of the adjacent street frontages. The project would provide a 6-foot sidewalk a nd Class II buffered bike lane along the project’s frontage on Pacific Stree t; the project would provide a 12-foot urban trail (shared use path) along the proj ect’s frontage on Linda Vista Driv e; and the project would also provide a 12-foot urban trail (sha red use path) along the project’s frontage on La Mirada Drive. In addition to the proposed sidewalk and trail connections, the project would add a bus stop and shelter with a bus turnout along South Las Posas Road adj acent to the development area and would install a
LINSCOTT, LAW & GREENSPAN, engineers LLG Ref. 3-20-3279 Pacific Project
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3 4-way traffic signal at the inters ection of Linda Vista Drive and P acific Street. Furthermore, the project would upsize approximately 1,458-feet of existing water pipe from 8-inches to 12-inches and would convert approximately 1,400-feet of existi ng overhead power lines to underground along La Mirada.
The proposed project would be acc essible from three points on La Mirada Drive, one emergency access-only point on South Las Posas Road, and tw o access points on Linda Vista Drive. The three access points on La Mirada Drive would serve th e residences of the rowhomes, villas, and apartments, and the two access points on Linda Vi sta drive would serve the residences of the affordable flats.
Figure 2–3 shows the conceptual site plan for the Project.
Vicinity Map