expertise
Drexel Barrell’s Expertise
SURVEYING
We started as surveyors in 1949 and land surveying, geomatics, and related services are still an integral part our business today. In fact, most of our projects start and end with surveying. We provide boundary and topographic design surveys at the beginning of a project. Our engineers design the infrastructure, and often contractors call upon our surveyors to provide accurate and precise construction staking so that the project is built in the right location and at the correct elevations. Finally, many agencies and clients contract with us to provide "as-builts" at completion to have a record set for future reference.
Drexel Barrell pioneered the use of GPS surveying in Colorado in the 1990's. Our "firsts" include establishing survey control in 1992 for reconstruction of the I-25 / 6th Avenue Interchange for CDOT; conducting the first GPS survey to the summit of Pike's Peak, including the Pikes Peak Highway from Manitou Springs; conducting an all GPS survey of the National Railway Test Center tracks in Pueblo in record time (1999), which allowed final evaluations of the 165-mph Acela passenger rail before deployment to the Washington DC-New York City-Boston Corridor; and the first LIDAR survey of the interior of the Colorado State Capitol Building as part of an historic preservation and restoration project.
Our Surveying services include:
| Boundary and ALTA surveys | Topographic and design surveys |
| Annexation and zoning maps | Subdivision and condominium plats, legal descriptions, and recorded exemptions |
| Right-of-way legal descriptions, mapping, and exhibits | Building height and floodplain certification surveys |
| Construction staking | As-constructed / as-built surveys |
| Building settlement monitoring | Bathymetric (lake and river bottom topography) surveys |
CIVIL / SITE INFRASTRUCTURE ENGINEERING
With the addition of engineer Bob Barrell in 1964, Drexel Barrell offered civil engineering services to our many clients. Our engineering portfolio has grown steadily over the succeeding years to accommodate public and private sector clients across Colorado.
Our Civil and Site Infrastructure engineering services include:
| Pedestrian, bicycle, and vehicular access, parking, and circulation | Horizontal control plans |
| Grading and drainage plans | Water, sewer, and storm utility plan and profile design |
| Detention pond, metered outlet works, and storm channel design | Drainage studies |
| Construction cost estimating, bid documents, and bidding assistance | Construction inspection and observation, closeout, punchlists, and as-builts |
WATER RESOURCES ENGINEERING
Since 1993, Drexel Barrell has offered hydrology and hydraulics engineering to public and private sector clients.
Our Water Resources capabilities include:
| Drainage basin hydrology, hydraulics, and planning studies | Regional detention pond planning and design |
| FEMA floodplain modeling, determinations, certifications, mapping, and Letters of Map Revision (CLOMR and LOMR) | Reservoir and dam design and rehabilitation |
| Bridge and culvert hydraulics and scour analyses | Storm sewer outfall and regional detention storage / water quality design |
| Pump station and force main design | Water distribution network hydraulic modeling |
| Large diameter water, sewer, and storm pipeline design | Zero-Rise Analyses and Design |
TRANSPORTATION AND TRAFFIC ENGINEERING
Also since 1993, Drexel Barrell has offered transportation and traffic engineering services.
Our Transportation and Traffic Engineering services include:
| Traffic impact studies | Street and highway design |
| Hazard Elimination Safety (HES) design | FHWA-funded Safe Routes to School design |
| Accel / decel lane design | Intersection, traffic signal, and roundabout design |
| Signalized pedestrian crossings (RRFB and HAWK Beacon) | Pedestrian and bicycle trails, and highway underpass design |
| Vehicle and pedestrian bridge design | CDOT Highway Access Permit processing and approvals |
| CDOT and railroad utility tunneling / boring design and approvals | Signing and striping / pavement marking plans |
Our Services and Expertise
Our services include land surveying, civil
engineering, site infrastructure design, transportation
and traffic engineering, water and wastewater
engineering, floodplain studies, construction
engineering, surveying, and inspection. This
comprehensive approach allows Drexel Barrell to provide
our clients with an A to Z
range of
services.
By offering technical expertise from design surveys through final construction inspection and acceptance, the client has one source of responsibility for project decisions and follow-through.
