Repeated Surveys at a Field Site for Quantification of LNAPL Vertical Distributions

A field study started in 2023 to demonstrate the Clear-Well technology. Two locations were installed using a direct-push rig.

Clear-WellJulio ZimbronJune 11, 2025

High Resolution Site Characterization (HRSC) of Vertical NAPL Distributions

A soil column was contaminated with LNAPL. Multiple cycles of water table levels were conducted, to generate a wide zone where the NAPL was observed.

Clear-WellJulio ZimbronJune 11, 2025

Mobilization of NAPL as Thin Film (Sheens) at the Unsaturated Zone

A soil column was initially contaminated with LNAPL. After an initial survey was conducted, the water level was dropped.

Clear-WellJulio ZimbronJune 11, 2025

Documenting Plant Root Growth

A soil column was surveyed multiple times a week using both white and UV lights (365 nm), after planting a basil plant on top.

Clear-WellJulio ZimbronJune 11, 2025

Case Study: Taking an 85 year old railyard from enrollment in a voluntary cleanup to no further action in ≈one year.

This is an old 60 acre railyard in Oregon, USA. The site owner went into an agreement with the State Agency under the State Voluntary Cleanup Program.

NSZDGabriel RodriguezSeptember 30, 2022

Radiocarbon eliminates interferences in the measurement of contaminant biodegradation rates

Soil contamination results in significant changes in the soil microbial ecology. Petroleum contaminants, and related organic compounds such as those generated by forest fires, are naturally present in natural environments.

NSZDJulio ZimbronAugust 30, 2022

A Study at a Large Oil Spill in an Urban Site in the Northeast USA Demonstrates the Use of Radiocarbon Analysis to Accurately Measure NSZD Rates

A study was initiated in 2016 to investigate NSZD, based on CO₂ fluxes at the surface, as part of a remediation project at a large oil spill in the Northeast U.S.

NSZDJesus SanchezOctober 1, 2021

Six Australian case studies of LNAPL NSZD rates using multiple methods, and comparing findings with conventional active recovery efforts

CRC Care, an independent organization dedicated to the remediation of contaminated soil, water, and air; published on March 2020 its technical report no. 47.

NSZDJesus SanchezOctober 1, 2021

ESTCP Report: Post-Remediation Performance Assessment at a Petroleum Impacted Site

This is a detailed report about an investigation at a Navy Air Station in which a multi-tiered approach was used to address

NSZDYoy Design AgencySeptember 28, 2021

Comparison of NSZD Characterization methods

A 2015 remediation project on an LNAPL-contaminated site compares different methods to measure NSZD rates.

NSZDYoy Design AgencySeptember 20, 2021

Phytoremediation as a Sustainable Remedial Alternative at a Hydrocarbon Contaminated Site

This presentation describes a phytoremediation project at a petroleum impacted site in California’s San Joaquin Valley.

NSZDYoy Design AgencyMay 22, 2020

Measurement of Natural Losses of LNAPL Using CO₂ Traps

Fossil Fuel Traps were developed at the Center for Contaminant Hydrology at Colorado State University over a five-year period after researchers there recognized the limitations of

NSZDYoy Design AgencyJune 13, 2014