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John Fontana
John Fontana

PG, President/CEO
Vista GeoScience

John Fontana is a Professional Geologist and CEO of Vista GeoScience in Golden, Colorado, with over 35 years of experience managing advanced site characterization and optimized in-situ remediation services. John models and interprets high-resolution subsurface data and assists clients with applying this data to in-situ remediation design. John is currently serving on two ITRC teams - one on Implementing Advanced Site Characterization Technologies and the other on Optimizing In-Situ Remediation Injections. He holds a BS in Geology, Oceanography and Physics from Humboldt State University, California.


Using the New Ultra-Violet Optical Image Profiler (OIP-UV) Combined with the Hydraulic Profile Tool (HPT) to Characterize Confined and Mobile LNAPL Plumes for Remedial Design

Sites with high dissolved phase petroleum contamination indicate the presence of lighter non-aqueous phase liquids (LNAPL), even though there is little or no LNAPL in monitor wells. These are suspected to have confined and immobile LNAPL. But, the distribution of this LNAPL can be elusive using conventional characterization methods. The OIP-UV tool is a direct-push probe, developed in 2016, that detects petroleum LNAPL using ultra-violet induced fluorescence with a vertical resolution of 0.05 feet. In 2018 the Hydraulic Profile Tool was integrated into the OIP-UV probe adding injection pressure and flow, hydraulic conductivity (K) and specific electrical conductance (SEC). This additional data identifies hydrostratigraphy responsible for confining LNAPL below the water table, where remediation is more difficult, and natural source-zone depletion (NSZD) rates are slower. 3D modeled OIP-UV/HPT survey results will be shown, revealing patterns in vertical and lateral LNAPL distribution, including migration opposite of ground water flow direction.

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