Site Assessment Using Laser-Induced Fluorescence at Hydrocarbon Contaminated Sites

Transcription

1 Site Assessment Using Laser-Induced Fluorescence at Hydrocarbon Contaminated Sites Jason Kirwin & Joann Dyson WCEC 2008 Minnesota Minnesota Ground Water Association Conference

2 Introduction Detailed Review of LIF/UVOST Technology Detailed Review of LIF/UVOST Application LIF Case Study #1: Classic NAPL Distribution LIF Case Study #2: Complex NAPL Migration LIF Case Study #3: Submerged NAPL Summary of Benefits 2 WCEC.com

3 LIF/UVOST Technology Overview LIF/UVOST - Laser Induced Fluorescence/ Ultra-Violet Optical Screening Tool Direct-sensing tool Utilizes push probe ft per day Non-aqueous phase liquid (NAPL) only. Fluoresces Polycyclic Aromatic Hydrocarbons (PAHs) Naphthalene 3 WCEC.com

4 Applications & Limitations Detectable Products gasoline diesel jet (kerosene) motor oil hydraulic fluids cutting fluids May also see: coal tar creosote (wood treatment) Doesn t see polychlorinated biphenyls (PCBs) chlorinated hydrocarbons False Positives organic matter calcite 4 WCEC.com

5 LIF/UVOST & SPOC UV laser light Fiber optic cable in rods SPOC: Shock-Protected Optical Compartment Sapphire window 5 WCEC.com

6 Example LIF/UVOST Log Continuous data Semi-Quantitative %RE Qualitative Product Type Waveforms (callouts) QA/QC (each push) - Reference Emitter Check - Background Check 6 WCEC.com

7 Example Waveforms 7 WCEC.com

8 Gasoline vs Diesel Waveforms Groundwater 21 ft 8 WCEC.com

9 LIF Application Overview Why LIF? Only technology that effectively and efficiently delineates source area (NAPL). When LIF? Proposed remediation system Evaluate NAPL position (horizontal and vertical) Design system to target NAPL Remediation system currently operating Evaluate post-operation NAPL position Investigation Evaluate magnitude of source area Focus Investigation Efforts Identify products, differentiate between RPs 9 WCEC.com

10 Key To LIF Understanding the Basic Subsurface Hydrocarbon Contamination Phases Soil Gas Vapor Phase Dissolved Phase (aka. aqueous phase) Adsorbed Phase Non Aqueous Phase Liquid (aka. source area ) 10 WCEC.com

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13 LIF Case Studies Site 1: Classic NAPL Distribution Site 2: Complex NAPL Migration Site 3: Submerged NAPL 13 WCEC.com

14 Site 1 Site Background 14 WCEC.com

15 Site 1 Site Background 15 WCEC.com

16 Site 1 Site Background 16 WCEC.com

17 Site 1 NAPL Phase vs Dissolved Phase Groundwater 21 ft 17 WCEC.com

18 Site 1 Cross Section A-A A with NAPL 18 WCEC.com

19 Site 1 NAPL Phase vs Vapor Phase 19 WCEC.com

20 Site 2 Site Background 20 WCEC.com

21 Site 2 Dissolved Phase Plume 21 WCEC.com

22 Site 2 NAPL Phase vs Dissolved Phase 22 WCEC.com

23 Site 2 Defined NAPL Phase 23 WCEC.com

24 Site 2 Defined NAPL Phase 24 WCEC.com

25 Site 2 NAPL Phase Vertical Migration 25 WCEC.com

26 Source Area Site 2 50 ft from Source 40 ft 40 ft 26 WCEC.com

27 80 ft from source Site 2 Perimeter 40 ft 40 ft 27 WCEC.com

28 Site 2 NAPL Phase Vertical Migration 28 WCEC.com

29 Site 2 NAPL Phase vs Vapor Phase 29 WCEC.com

30 Site 3 Site Background 30 WCEC.com

31 Site 3 LIF Grid Sampling 31 WCEC.com

32 Site 3 Defined NAPL Extent 32 WCEC.com

33 Site 3 Source Area Perimeter ft ft Depth (feet) 33 WCEC.com

34 Site 3 Submerged NAPL Former UST 34 WCEC.com

35 Site 3: 3D NAPL Distribution 35 WCEC.com

36 Recent Technology Advances LIF/EC 36 WCEC.com

37 Benefits of LIF/UVOST Product identification Instantaneous/continuous data Focuses on source, not symptom Efficient no lab sampling, fast paced, focused remediation, well-informed decisions Geoprobe deliverable feet/day Prerequisite for effective remediation design and an accurate site conceptual model. 37 WCEC.com

38 Questions? Jason Kirwin Director of Market Development Office: (320) Cell: (320) Website: Joann Dyson LIF Director Office: (320) Cell: (320) Website: Jason Kirwin Director of Market Development Joann Dyson LIF Director 38 WCEC.com

39 Recommended Reading ASTM E Standard Guide for Development of Conceptual Site Models and Remediation Strategies for Light Nonaqueous-Phase Liquids Released to the Subsurface Nyer etal. In Situ Treatment Technology - Second Addition, Adamski, D., Kremesec, V., Kolhatkar R., Pearson, C., Rowan, B., 2005, LNAPL in Fine Grained Soils: Conceptualization of Saturation, Distribution, Recovery, and Their Modeling, Groundwater Monitoring & Remediation 25, No 1. LIF E-Brochure 39 WCEC.com