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San Diego County, California


San Diego County Trail Assessment




Donald Hays Trail Contractor, Inc. provided their special knowledge, services and skills to provide the following services:

Phase #1: To conduct in the field, using his professional experience in trail planning, design, construction, reconstruction and maintenance of non-motorized, multi-use trails (riding, hiking and mountain biking), a Trails Condition Assessment (TCA) for approximately 200 miles of existing trails and pathways identified in the draft Community Trails Master Plan (CTMP) for the participating unincorporated communities in County San of Diego. This work shall be completed within 90 days. DHTC,Inc. shall provide a trail log for each trail surveyed for each community.

Phase #2: After the community trails assessment is complete, DHTC,Inc. shall upon receiving the notice to proceed from the County, begin this phase of the work which consists of a trails condition assessment for approximately 200 miles of existing trails and pathways identified in the draft Community Trails Master Plan as regional trails or open space trails in the unincorporated areas of the County San of Diego. Task #2 related work will be completed within 90 days of the second notice to proceed but only after Phase #1 is completed.

DHTC,Inc is expected to work closely with County Departments of Parks and Recreation (DPR), lead agency; Planning and Land Use (DPLU); and Public Works (DPW) and staff that comprises the Trails Program Management Team (TPMT) pursuant to the following:

A. Basic Services. DHTC,Inc shall:
1. Provide and use GPS (global positioning system) equipment, such as Trimble Pro XRS or equal with sub-meter accuracy or better, for conducting the field assessment.
2. Provide in-house GIS (geographic information system) data preparation upon completion of the assessment, compatible with County DPW GIS software, on CD(s) in ESRI ShapeFile format and in NAD 83 California Zone 6 Coordinate System. The County will become sole owner and have no restrictions on the data received.
3. Provide corrections or modifications as necessary to orthographic maps (provided by the County) during the field surveys.
4. Use a trail specific data dictionary and terminology for trail features compatible with the County of San Diego, DPW/DPR, GIS Division.
5. Provide electronically dated photographs for each trail inventoried. Digital camera quality shall be a minimum of 2.0 mega-pixels.
a. Photographs shall be furnished to the County as “jpeg” files on labeled/numbered CDs and shall become the sole property of the County of San Diego and have no restrictions on the files received.
b. Photograph format must be of sufficient detail to allow for enlargement and be used as a substitute for field visits.
c. Photographs will include all trail termini and intersections with other trails or roads.
d. All trail features noted in the data dictionary such as signs, fencing, water bars or grade dips, wet crossings, typical trail sections, bridges, puncheon, culverts or other structures will be photographed and indexed to correspond to the trail log.
e. Major erosion occurrences, large windfalls, slides, structure failures and other heavy maintenance needs will be photographed.
f. An index or listing of the photographs, location, trail name/number and community
6. Notify the County immediately if during the trail assessment a constructed feature inventoried, such as a bridge, appears to be failing or any portion of a trail is in such condition as it creates a public safety hazard.
7. Comply with “Leave No Trace” practices. Overnight camping on the trails is prohibited.

Required Tasks:

TASK 1 - PROJECT INITIATION: Prior to starting the TCA, DHTC,Inc shall meet with members of the Trails Program Management Team (TPMT) to fully discuss the project, potential impacts, deliverables and procedures for project approval. DHTC,Inc will demonstrate to the TPMT the type of equipment to be utilized for the assessment and samples of the work to be produced. The County will provide the DHTC,Inc with all available pertinent documentation for the project that may include but not necessarily limited to:

  • CTMP Maps
  • Orthographic Maps/Aerial Photographs for Data Correction
  • Coordinate System for Export
  • Community Contacts List and Emergency Numbers
  • 2-Way Radio for Emergencies
  • Other Information as Available/Necessary

An in the field meeting (a second meeting, if necessary) will be scheduled with the TPMT and others that the County may invite to walk a sample section of a trail and collect typical trail segment data to insure it is compatible with the County’s GIS programs/system and to verify to the satisfaction of the TPMT, the accuracy and quality of DHTC,Inc equipment.

TASK 2 - TRAILS CONDITION ASSESSMENT: Utilizing the mapping information provided by the County, DHTC,Inc shall conduct an in-the-field assessment of existing trails within each identified community. Communities that have segments of existing regional trails identified on their map as community or regional, should be surveyed while conducting the community trails survey, Phase #1.

The TCA will be conducted community by community by hiking each identified existing trail and will consist of data collection with GPS equipment and digital photographs. DHTC,Inc work shall include creating a trail log for each trail based upon the data collected but not necessarily limited to: Community Surveyed; Nearest Cross Street at Start of Trail; Trail Name and/or Number; Trail Length and Width; Percent of Grade and Percent of Side Slope; and Trail Condition/Maintenance Problems such as:

  • Erosion/excessive wear
  • Height clearance issues
  • Steps cut in trail
  • Excessive grades/cross slopes
  • Stream/river crossing points (water or dry)
  • Wheelchair accessible grades
  • Access (physical/encroachments)

Constructed features on the trail such as:

  • Drainage structures (water bars, grade dips, culverts, gabions and puncheon)
  • Signs (of any type or function) located to benefit trail users
  • Switchbacks or climbing turns
  • Retaining walls, curb logs or similar structures designed to stabilize trail tread, fill slopes or back slopes
  • Bridges, tunnels, underpasses or overpasses, road crossings (include if signalized for the crossing, crosswalks, stop lights, signage)
  • Gates (step-over, zigzag walk through, wheelchair accessible)
  • Fencing (purpose, types, size, condition)
  • Above ground (in the trail easement) utilities (power poles, cable/telephone pedestals or cabinets, transformers, manholes) that have conflict potential
  • Legal camping locations (such as adjacent/near parks that community trails pass through);
  • Other points interest

After the TCA is complete, consultant shall coordinate with DPW/DPR GIS to assure understanding and compatibility of the information received.

Based on data collected, DHTC,Inc shall prepare an opinion of probable repair/rehabilitation costs for those items/trail features identified in the trail logs for each community. The opinion of probable costs shall be based on payment of State prevailing wages, regional equipment rental rates and prevailing material costs. Opinion of probable costs shall be prepared in Microsoft Excel or compatible approved spreadsheet program. DHTC,Inc shall provide the information to the County on a CD.


TijuanaRiverValley Open Space Preserve

As an addition to the San Diego County Trail Assessment, DHTC, Inc was contracted to document all undocumented and documented routes from the Mexican-American border in the one square mile of county property betweenSoldierFieldState Parkand Highway Interstate 80. The amount of damage was going to be documented and possible new more environmentally friendly routes could be approved and maintained.  After data logging and exporting data to Shapefile and calculations done, there we over 65 miles of line data in one square mile of land.  With this data the county is able to abandon some of the non-system routes and rebuild  and/or maintain the approved system routes.