As a logical expansion to our robust technical resources business, we place our own team of engineers on engineering design projects. What began as an occasional contract became more frequent once private firms and public agencies got word that our highly skilled engineers–with innovative solutions–were coming directly from Darnell Technical Services.

With over 20 years of engineering and design experience, we know what’s at stake for an engineering design project: successful project management and the right technical resources. We provide both. Plus all of the certifications, approvals and experience required to bring your project to completion.

In this season of large infrastructure upgrade projects, it’s especially important that you partner with a company with a successful history in the industry. You’ll get that with Darnell Technical Services.

Darnell Technical Services performs Production CADD Projects (On-site /Off-site), partnering on project services in Civil and Structural industries of Federal, State, County, and Local Municipalities.

All CADD projects feature the creation and establishment of CADD Standards and Plans based on client specifications for projects ranging from the planning stage, private residence, commercial facilities, grading, drainage, erosion control, permitting and structural bridges, MTA Subway Stations, street Improvements and storm drainage/water, and Public and Municipal Utilities within the Los Angeles and Orange county areas.


• Design and production plans for subway stations, freeway widening, street improvements, storm drain plans, grading, earthwork, street lighting, striping plans, and structural bridge plans

• Packaging design and documentation for Right-of-Way Maps, both conventional and Computer Aided Drafting

• Create layouts of Tract/Parcel Maps, ATLA’S, Plats, Parcel Maps, Railroad Crossings and Plan Sheets as required by Public Agencies

• Roadway and storm drain improvement plans, traffic engineering, collected and analyzed data, producing reports with graphics for traffic, parking and pedestrian studies

• Field reviews of intersections and Signal Systems

• Traffic Signal Plans using city and Caltrans standards and Traffic Control Plans for Construction Zone


• Pipeline Operations (Mechanical) | Transmission (Pipeline Design) | Storage
(Cota, Guava, Mason Street, Olympic Orangethorpe, Westridge Bridges | O&M Transmission)

• PSEP (Pipeline Safety Enhancement Program)

• Mobile Home Utility Upgrade Program (conversion of electric & natural master-metered services at Mobile Home Parks/Manufactured Housing Communities)

• Transmission (Piping Design) | Integrity (Mapping & Records) (Olive Hill, Willow Street, & Casa Mira View Bridges, Line 49-11 Abandonment for Pipeline Safety Enhancement, Bear Valley North Parkway Pipeline Relocation Project, and Final Features Study for Line 49-15 for Pipeline Safety Enhancement)

• Tehachapi Renewable Transmission Project (TRTP) (Construction Project Management | QA QC on underground pipeline work for natural gas)

• Crenshaw/LAX Transit Corridor Project (CAD drawings for the Crenshaw Silver Line Metro Rail Project for the Waterproofing and Tunneling Departments, and inputting Survey Data Points)

• California High Speed Rail (CHSR) (Civil Utility Engineering | CAD Management – annotate, analyze and verify utilities and layout in CAD,and generate data for environmental footprint GIS test data)

• Westside Transit Corridor (Purple Line)

• I-405 Freeway (Sepulveda widening pass)


• Architectural: Buildings, Interiors, Space Planning, Hospitals, Facilities, Solar

• Chemical / Process: Power, Petrochemical, Refinery, Renewable Energy, Natural Gas

• Civil: Water Resources, Land Development, Utilities

• Electrical / Instrumentation: Power Distribution, Controls

• Environmental: Filtration, Nuclear, Renewable Energy, Water Resources, EPA

• Facilities: HVAC, Plumbing, Furnace

• Mechanical / Process: P & ID’s, Piping, Mechanical Equipment

• Structural: Concrete, Steel, Tilt-up’s, Bridges, Retaining Walls

• Transportation: Communications Systems, Roads & Highway, Traffic, Railways, Mapping

• Application knowledge of the following CAD tools for clients and consultants: MicroStation | Bentley | AutoCAD | AutoDesk | GIS | ESRI