Zebra - TRIAD-ES Joint Presentation
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This document discusses using high resolution site characterization tools to efficiently characterize contaminated sites. It presents an overview of tools like membrane interface probes, hydraulic profiling tools, and on-site analytical methods that can provide high density geological, hydrogeological, and contaminant distribution data. Case studies demonstrate how these tools can be used to precisely delineate non-aqueous phase liquid sources and fluxes to inform remediation decisions. The document emphasizes that high resolution data allows conceptual site models to evolve dynamically during investigations and for remedies to target the most mobile contamination.
Zebra - TRIAD-ES Joint Presentation
- 1. High Resolution Site Characterization Applying Next Generation Tools to Accelerate Site Closure William M. Davis Triad Environmental Solutions, Inc. Brad Carlson ZEBRA
- 2. • Overview: Need for High Resolution Site Characterization • Tools for HR Characterization High Resolution Hydro-geologic Mapping Tools Real-time Analytical Tools Semi-quantitative Quantitative • Strategies for HR Characterization • Case Studies High Resolution Site Characterization Applying Next Generation Tools
- 3. Why are there so many old NAPL sites and why are NAPL sources so hard to find? • Heterogeneity of subsurface geology and hydrogeology • The nature of NAPL transport • Need high density data to design remedy • Need cost effective NAPL source and plume characterization tools 6283 ft MIP/DSITMS @ 83 locations 6283 ft MIP/DSITMS @ 83 locations High Resolution Site Characterization Applying Next Generation Tools
- 4. • Apply HR Characterization methods to map mass and hydrogeology • Knowing mass and hydraulic conductivity allows assessment of flux • Use flux-informed decision making to target moving mass Focus remedies to reduce volume of treatment and minimize risk Understand endpoints and duration before investing in remedy Reduce total life cycle costs Return on investment from using HR Characterization– typically 5 to 10x High Resolution Site Characterization Applying Next Generation Tools
- 5. SHAREPOINT WEBSITE FOR DATA SHARING
- 6. Cross-section from a 2D ECD Fence Slice. Installed MW overlay ECD Background Slice Sampling Event Data Lithology Overlay ECD Graph Overlay
- 7. 3D ECD Fence Model
- 8. Using 3D modeling software, we can generate true 3D Solid Models. This Plan View model was created using ECD data from a recent MIP project . Any orientation can be displayed and cross-sections or fence diagrams can be created.
- 9. HRSC Solid Model with Surface Objects
- 10. HRSC Model with SubSurface Objects
- 13. What is the Membrane Interface Probe? The Membrane Interface Probe (MIP) is rapid, high-resolution field screening technology that provides information about relative concentrations of VOCs in the subsurface, and the Electrical Conductivity of the soil. The MIP uses a thin film fluorocarbon polymer membrane approx. 6.35mm in diameter which stays in direct contact with the soil during MIP logging. •The thin film membrane is impregnated into a stainless steel screen which serves as a rigid support for the fluorocarbon polymer. •The down-hole, permeable membrane serves as an interface to a detector at the surface. •Volatiles in the subsurface are getting transferred across the membrane and partition into a stream of carrier gas where they are swept to the detector. The membrane is heated in order to facilitate VOC transfer and self- cleaning.
- 14. The MIP System
- 15. THE MIP PROBE EC Dipole Membrane Heater Block
- 16. FID PID ECD
- 17. MIP Detection Limits MIP DETECTORS Contaminates Detection Limit Carrier Gas PID BTEX 1 PPM Nitrogen, Helium FID Methane, Butane NA Nitrogen, Helium ECD Chlorinateds 250PPB Nitrogen
- 18. MIP Log
- 19. Hydraulic Profiling Tool (HPT)
- 20. • Advance probe at constant rate • Inject water at low flow rate • Measure formation pressure response 2 cm/sec Hydraulic Profiling Tool (HPT)
- 21. HPT LOG EC HPT Press Flow Corr HPT Pressure Est K Abs Hydro Pressure
- 22. HPT Dissipation – Static Water Level 24.4ft 24.5ft
- 23. THE MiHPT PROBE EC Dipole MIP Membrane Heater Block HPT Screen
- 24. The MiHPT System
- 26. CPT & CPT/MIP
- 27. CPT
- 29. HPT-GWS A Combined HPT and Groundwater Sampler probe!
- 30. HPT-GWS A Combined HPT and Groundwater Sampler probe!
- 36. UVOST/LIF
- 37. Hydro-Geology – Cone Penetrometer – Direct-Push Technology – Hydraulic Profiling Tool Analytical – In-Situ Probes MIP UVOST – GC/MS EPA Method 8260b – DSITMS EPA Method 8265 Examples of Real-Time Technologies for High Resolution Site Characterization High Resolution Site Characterization Applying Next Generation Tools
- 38. Discrete sampling combined with ex-situ, on-site analysis GW and/or soil sampling with on-site analysis can produce high density data sets cost effectively. GW and soil data required to collaborate Semi-quantitative MIP results Numerous sampling methods including direct push and sonic drilling High through put, real-time analyses using on-site EPA Methods High Resolution Site Characterization Applying Next Generation Tools
- 39. On-site Analysis of Vapor, Soil and GW Using US EPA Method 8265 Direct sampling ion trap mass spectrometer (DSITMS) MIP Very Rapid Analytical Turn Around Soil and GW in 2-3 min. Vapor in 3-5 min. Quantitative High level QC
- 40. Real-time Direct Sampling Ion Trap Mass Spectrometer (DSITMS) Analysis of VOCs in Soil, GW and Vapor • Basis for US EPA SW846 Method 8265 • Quantitative VOC analyses LODs ug/kg, ug/L, ug/m3 • Sample turn around times of 2-3 min. (soil and GW) • Over 80 client samples per day plus QC • Can be used as MIP detector Method 5035 MeOH Extract Method 8265 Analysis High Resolution Site Characterization Applying Next Generation Tools
- 41. On-site Labs using EPA SW846 Methods EPA SW 846 Method Instrument Daily Client Sample Throughput Advantages Disadvantages 8021c PT/GC 20 NELAP available, can ID isomers 25 minute run times, subject to overload 8260b PT/GC/MS 20 NELAP available, can ID isomers 25 minute run times, subject to overload 8265 P/DSITMS 80 2-3 minute run times, very rapid recovery from overload Isomers reported as pair/group High Resolution Site Characterization Applying Next Generation Tools
- 42. • Multiple lines of evidence (data) Geologic Hydrogeologic Contaminant • High density data sets plan view and vertical • Adaptive, flexible, dynamic….. sampling plan with clear DQOs • On-site, real-time analysis • On-site, real-time decisions • Evolving conceptual site model Strategies for Cost Effective Site Characterization High Resolution Site Characterization Applying Next Generation Tools
- 43. Approach Triad approach used with full systematic planning, active involvement of LA DEQ during planning and execution Real-time geologic data collected using CPT with pore pressure sensor Real-time measurement of TCE and daughter products by combined CPT/MIP w/ FID/PID/ECD and DSITMS Direct push soil and GW sampling with on-site soil and GW analysis by EPA Method 8265 Off-site GW analysis by EPA Method 8260 for LA DEQ decision quality data Daily posting of field data to password protected, project specific website Daily updating of evolving Conceptual Site Model Case Study TCE Source and Plume Investigation NASA Michoud Assembly Facility
- 44. Case Study TCE Source and Plume Investigation NASA Michoud Assembly Facility Proposed transects for 190 Tank Farm and RWI
- 45. Case Study TCE Source and Plume Investigation NASA Michoud Assembly Facility Stratigraphic cross section RWI
- 46. Case Study TCE Source and Plume Investigation NASA Michoud Assembly Facility DNAPL with stratigraphy in the RWI Area
- 47. Case Study TCE Source and Plume Investigation NASA Michoud Assembly Facility
- 48. Case Study TCE Source and Plume Investigation NASA Michoud Assembly Facility Conclusions Project objectives were met: DNAPL source areas were delineated in three dimensions and DNAPL mass was estimated for the three areas of interest: Building 103: 65,700 kg TCE, 44,900 L (11,800 gal) 190 Tank Farm: 30,900 kg TCE, 21,200 L (5,600 gal) Rinse Water Imp: 41,900 kg TCE, 29,400 L (7,700 gal) Mapped boundaries of dissolved phase TCE and daughter products exceeding LA DEQ standards were established Triad approach managed both sampling and analytical uncertainty Collaborative data sets created strong/defensible final CSM Data used for evaluating Interim Stabilization Measures and Final Remedies
- 49. High Resolution Site Characterization Applying Next Generation Tools
- 50. Summary • High density data (geologic, hydro-geologic and contaminant distribution) are required to understand DNAPL sites • Having a full tool box (hydro-geologic and analytical) allows cost effective implementation of dynamic investigations • Experienced staff must be involved during field execution, both on-site and off-site High Resolution Site Characterization Applying Next Generation Tools
- 51. Summary • Many tools are available to support high density data collection • Using available tools, complex NAPL sites can be characterized cost effectively • The costs associated with creating high density, accurate Conceptual Site Models are repaid multiple times over during site remediation High Resolution Site Characterization Applying Next Generation Tools
- 52. Stratigraphy Contaminant Hydrogeology CSM viewed as an instrument Triad Instruments, Inc. Triadometer Model T2007 Operations Manual Model T2007 Operations Man. Table of Contents 1. DQO process 2. Historical info. 3. SOPs/QC 4. Decision logic 5. Data Manag. 6. Data Commun. Triadometer Model T2007
- 53. How do you know when enough (data) is enough? Using the Triad approach allows the decision to stop taking data to be made with confidence BEFORE you leave the site. High Resolution Site Characterization Applying Next Generation Tools