Tag Archives: Excavation Clearance

DigClean is Protecting Excavators Across Delaware From Buried Chemicals

Excavations are a common event around contaminated sites as each flash of light signifies.  This map shows flashes for each excavations around contaminated sites in New Castle County, Delaware.  Try  adjusting the map, the date may be adjusted on the slider, and the coverage area adjusted by the zoom control.   You are watching about 3,500 excavation clearances resulting in […]

Mobile Web Tool for Excavators in Delaware Helps Plan for Subsurface Chemical Hazards

Terradex is testing a mobile web tool to assist excavators and engineers working near spill sites. Now under testing by several utility companies, the web tool permits an excavator to learn chemical information at cleanup sites in Delaware. The tool addresses a common need in the field:  “How in advance of an excavation, can we […]

Forecasting an Engineering Control or Institutional Control Breach, A Study of Third-party Excavation Activity

Excavations by third-parties are inevitable near any cleanup site. Of concern to cleanup site managers, these unexpected events can breach institutional or engineering controls relied upon in a site’s cleanup remedy. Third-party excavators include utility companies, developers and contractors whose work is not part of the site cleanup process. Terradex completed an analysis of excavation […]

USEPA Releases Final Guidance for Implementing Institutional Controls

The USEPA issued the Final Guide to Planning, Implementing, Maintaining and Enforcing (PIME) Institutional Controls at Contaminated Sites.  This is the second of two guidance documents prepared by the USEPA to inform long-term stewardship of contaminated sites.  In 2000, the first guide was drafted with a focus toward the selection of institutional controls (ICs). In 2000 […]

Dig Clean Excavation Advisory Begins in Delaware

As another step towards increased environmental agency integration into one-call systems, on December 17, 2012 Terradex expanded its Dig Clean service on behalf of the Delaware Department of Natural Resources and Environmental Conservation (DNREC).   Terradex Dig Clean builds near real-time advisories that it sends to contractors and designers after they submit “locate requests” but  before […]

Slowly But Surely: One Call Systems Increasingly Used for Environmental Cleanup Sites

Slowly but surely, often with close involvement of Terradex, the power of one-call helps manage cleanup sites.  In every state, call-before-you-dig or “one call” laws require a phone call (or increasingly an electronic notice) of the planned dig.  State one-call centers route the resulting “excavation tickets” to the people and companies who own or operate underground […]

Terradex Keeps Contaminated Soil Safely Managed

We often think of Institutional Controls (ICs) as prohibiting certain uses – for example, prohibiting groundwater use, prohibiting daycare or school, etc.  But often, and importantly, ICs help make sure that contaminated soil, when excavated,  is managed properly and isn’t, for example, carried away for use as “clean fill.”  For those who deal with ICs, […]

States and Locals Gather on the Web to Talk ICs

A little over a week ago, Terradex hosted a web meeting on institutional controls (IC) efforts at state and local agencies, with a particular focus on the use of one call and local and state cooperation. About 15 participants from EPA, state agencies, local government, and academia gave 3-minute overviews of their IC stewardship efforts […]

Helping West Virginia Screen One Call Excavation Tickets at Cleanup Sites

In both a progressive and unique move, the West Virginia DEP joined the state’s call-before-you dig, or “One Call” center to help screen for improper excavations at about 100 of the state’s environmental covenant sites.   The process requires a daily review of excavation tickets at or near these site which, in turn, allows DEP to […]

Working with Excavators Clearance Systems to Proactively Inform of Environmental and Health Hazards

The excavation limits of a new water main are marked on the street. Consistent with state regulation, the excavator calls in the excavation limits to the One-Call System. Soon the street is marked with utility locations. Surprisingly, the excavator receives a fax describing that the excavation site as occurring in a zone of environmental contamination. […]