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City of Walnut Creek Transportation Impact Analysis Guidelines- Existing Conditions

5.0 Existing Conditions

The Transportation Impact Study (TIS) must provide a thorough analysis of the existing transportation conditions within and around the proposed project site. The purpose of this section is to establish a baseline for assessing the transportation-related impacts of the proposed development. The following components should be included in the evaluation of existing conditions:

  1. Description of Existing Streets and Roadways

    • A comprehensive description of all streets and roadways within the project site and its surrounding area should be included.

    • Roadway classifications should be based on the City of Walnut Creek General Plan Transportation Element.

    • Details such as the number of lanes, posted speed limits, divided or undivided configurations, and the presence of bike lanes should be documented.

    • A figure illustrating the roadways surrounding or logically associated with the project site must be provided.

  2. Transit Facilities

    • The study should document any existing transit facilities within a radius of at least 1,300 feet from the project site.

    • Information should include the transit service provider(s), available routes, frequency of service, and the location and amenities of existing bus stops.

  3. Bicycle and Pedestrian Facilities

    • Existing and planned bicycle and pedestrian facilities adjacent to the project site must be identified.

    • If the project interacts with or impacts these facilities, detailed descriptions should be provided, including any planned improvements or infrastructure developments.

  4. Intersection Level of Service (LOS) and Performance Measures

    • The study must include an analysis of LOS at all study intersections and regional roadways.

    • Summarized results should be presented in tables, and intersections should be consistently numbered across all figures, tables, and LOS analysis worksheets.

    • If any study intersections or roadway segments are operating at unacceptable levels, potential improvement measures should be identified.

6.0 Project Description

A detailed project description is essential for accurately assessing transportation impacts. This section should include the following:

  1. Project Location and Site Information

    • The project’s location, including its address and cross streets, must be documented.

    • Lot area, existing and proposed zoning, and a figure illustrating the lot’s location on the Assessor’s Block should be included.

  2. Land Use and Density

    • The total gross square footage for each type of land use, as well as the number of units for residential or live/work uses, must be documented.

    • Existing and proposed net changes should be clearly outlined.

    • Estimated numbers of employees and/or dwelling units by type should be included.

  3. Public Right-of-Way Modifications

    • Any proposed use of public rights-of-way should be described in detail, including:

      • Sidewalk width changes

      • Changes in the width or number of traffic lanes

      • Changes to lane functions, such as channelization or direction of travel modifications

  4. Parking and Loading

    • The number of existing and proposed off-street parking spaces should be included.

    • If on-street or off-street parking spaces will be removed, this must be explicitly noted.

    • The number of off-street and on-street freight loading spaces should be documented, along with any proposed changes affecting loading areas.

  5. Vehicular and Pedestrian Access

    • Detailed plans should be provided for vehicular and pedestrian site access.

    • The location of curb cuts and internal vehicular circulation should be presented in a standard architectural or engineering scale.

  6. Site Circulation and Infrastructure

    • Figures should identify parking spaces, proposed ingress and egress points, circulation patterns within the parking facility, and the location of accessible (ADA-compliant) parking spaces.

    • The location and dimensions of off-street freight loading spaces and on-site trash and garbage storage must be documented.

    • The location, number, and type of bicycle parking spaces should be included, along with details on primary bicycle access.

7.0 Approved and Pending Projects

The TIS must account for approved and pending projects within the vicinity of the proposed development. This analysis ensures that cumulative transportation impacts are accurately assessed.

  1. Identification of Relevant Projects

    • Developments generating vehicle trips that would impact study intersections and roadway segments should be included.

    • Approved, pending, or recently constructed projects not yet fully occupied should be considered.

    • The list of projects is subject to City Staff approval.

  2. Traffic Volume Considerations

    • A table summarizing approved and pending projects, including their locations and trip generation estimates, should be provided.

    • A figure illustrating peak hour traffic volumes for existing conditions, plus approved and pending projects, must be included.

    • Conditional use permit/parcel map/tract numbers should be documented, if available.

  3. Future Roadways and Intersections

    • All assumed future roadways and intersections should be identified and discussed.

    • The scope and status of these improvements, including construction schedules and funding plans, should be documented.

  4. Intersection Level of Service (LOS) Analysis

    • Results of LOS analyses for intersections and regional roadways should be summarized in tables.

    • Study intersections should retain consistent numbering across all tables, figures, and worksheets.

    • If projected operations at intersections or roadway segments are expected to fall below acceptable levels, potential mitigation measures should be identified.

  5. Capital Improvement Program (CIP) Transportation Projects

    • Any transportation improvements from the City’s CIP that are assumed in the analysis should be identified and documented with anticipated completion years.

    • Information on relevant CIP projects can be found on the City’s website at: www.walnut-creek.org/citygov/depts/ps/engineering/cip.

  6. Assumptions and Justifications

    • All assumptions used in the study should have proper citations and justifications to ensure transparency and accuracy in the TIS.

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