Laser Induced Fluorescence (LIF) - UVOST

www.numac.com.au | 1300 131 019 | Melbourne | Sydney | BrisbaneDrilling is just the beginning ...Subsurface SamplingUltraviolet Optical Screening Tool (UVOST)Numac has advanced to become an industry leader in the utilization of High Resolution Vertical Profiling tools that detect subsurface contamination for environmental site assessments and characterisations. The Ultraviolet Optical Screening Tool (UVOST®) utilises Laser Induced Fluorescence (LIF), a Light Non-Aqueous Phase Liquid (LNAPL) mapping tool used to delineate the vertical and horizontal extent of free product and residual contamination. LIF technology quickly and efficiently delineates LNAPL in the subsurface in real time and high resolution (65 readings per metre),and can detect all types of petroleum, such as petrol, diesel fuel, oils (bunker, crude, hydraulic, waste, cutting, etc.) as well as creosote and coal tar.How UVOST Works:Petroleum hydrocarbons contain significant amounts of naturally fluorescent polynuclear aromatic hydrocarbons (PAHs). Contact from ultraviolet (laser) light from the LIF system causes PAHs to fluoresce. The LIF system uses a sapphire window in the side of the direct push probe to measure front-face fluorescence of the petroleum LNAPL as the probe is advanced into the soil. PAH fluorescence of fuels/oils is directed back to the surface where it is analysed. Responses are indicated in real-time on a graph of UVOST signal vs. depth.UVOST can be used on a variety of sites – anywhere that petroleum is used, stored, dispensed, or disposed:• Petrol/Diesel Retail Stations and Depots• Oil refineries• UST Sites• Rail Yards• Defence Sites• Gasworks• Coal Tar SitesMajor Benefits of UVOST:• Typical detection limit of 10-500 ppm (NAPL type and soil dependent)• Operates effectively above and below the saturated zone• Fast – probe advances at ~20 mm/sec without pause• Typical daily productivity of 100-150 metres across 10-20 locations• High Resolution data density (65 readings per metre), coupled with near instantaneous response, provides continuous detailed log of product distribution and heterogeneity• Color-coded logs for the ultimate in qualitative information “at-a-glance”• CPT and percussion (Geoprobe/PowerProbe) deliverable – if direct push sampling gets there, UVOST® can get there.