Author Archives: Bob Wenzlau

Bob’s goal has been to build the “institution” for institutional controls. The building blocks include a strong understanding of regulatory and technical requirements of stewardship, and an arsenal of multiple information and mapping techniques. Bob is a registered civil engineer, graduate of Stanford and is a founder and now CEO of Terradex, Inc.

NAESIP and Terradex Introduce Brownfield Loss Control Services

Terradex’s exclusive loss control services support Gremesco’s Site Pollution Liability (SPL) coverage for owners and developers of brownfield properties subject to IC/ECs.

A Proposal To Improve Institutional Control Effectiveness Through Better Mapping

Try to read a typical institutional control (IC) and locate its boundaries. We bet you can’t. You will find a complicated legal description referring to metes and bounds, but not a map of the restricted areas that you can actually see and understand. Only licensed surveyors can decipher these legal descriptions, but all the parties […]

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 […]

Conversation with Bob Wenzlau, Terradex CEO

testing – colin 05/15/2015

Environmental Protections – A Proposal for Public Branding of Institutional Controls

Through WhatsDown, we maintain a catalog of “institutional controls”.  However, in the app there is one big change – we replaced the term ‘institutional control” with the term “environmental protection”. With WhatsDown serving the public, we were compelled to generate an intuitive mapping application. The term “institutional control” is a general umbrella term that captures various devices including environmental […]

Long Term Stewardship at Vapor Intrusion Sites – Looking at the End Game

via YouTube Long term stewardship (LTS)  is the “end game” of any vapor intrusion problem. Any smart player, considers the “end game” at the start and during play. Knowing the “end game” sets a smart direction for any stakeholder of a vapor intrusion – a responsible party, landowner, environmental agency staff, and the public. Mr. […]

Mapping Shallow Volatile Groundwater Plumes in Silicon Valley

Silicon Valley prides itself as a leader in environmental sustainability, but opportunities for improvement are ever present.  This post introduces new map-based services showing contaminated groundwater areas in Silicon Valley, helping to provide intuitive environmental data meant to inform all interested stakeholders. The Valley has evolved from former industrial areas that held semiconductor industry that […]

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 […]

The Release of an Institutional Control Data Schema and Flow

  Marking a big step forward in the “institution” for institutional controls (ICs), on June 10, 2013 the Environmental Information Exchange Network (EIEN) announced the release of an IC Data Exchange. The IC Data Exchange provides a standard means for sharing IC information between separately-owned computer systems – including sharing among different levels of government and between […]