MiHpt Membrane Interface Probe + Hydraulic Profiling Tool

Transcription

1 MiHpt Membrane Interface Probe + Hydraulic Profiling Tool Tom Christy, PE Wes McCall, PG Dan Pipp, Chemist Geoprobe Systems Anders Christensen Klaus Weber NIRAS, Denmark Mads Terkelsen Danish Capital Region

2 Outline How Does MIP Work? MIP Log How Does HPT Work? HPT Log The Combined MiHpt Probe & Log Cross Sections with MiHpt logs Developing a Conceptual Site Model

3 The MIP Probe EC Dipole Trunkline Connections Heater Block Membrane

4 Nitrogen Carrier Gas VOCs to Detector MIP Principles of Operation: Probe Body VOCs in Soil VOCs diffuse under a concentration gradient Semi-permeable Membrane The heater block at ~100C enhances diffusion

5 MIP Instrumentation Portable Computer FI6000 Field Instrument MIP Controller Gas Chromatograph with three detectors: PID FID XSD (or ECD)

6 MIP Field Operation String pot tracks depth Advance probe incrementally

7 MIP QA/QC Field VOC Response Testing Field standard (e.g. Benzene, TCE, PCE, etc.) Field standard is injected into 500ml of clean water NOT A CALIBRATION The heated MIP probe is inserted into the working standard for 45 seconds

8 Typical Response Test Immersion Time (45s) Response to single analyte (e.g. benzene) in water. Typically 5ppm concentration Trip Time Trip time is entered into the acquisition software to correlate detector response with depth.

9 Example MIP Log: Skuldelev SK05 Electrical Conductivity (ms/m)

10 Example MIP Log: Skuldelev SK05 Electrical Conductivity (ms/m) EC Rule of Thumb : Low EC >> sand.. High EC >> clay Exceptions!

11 Example MIP Log: Skuldelev SK05 PID Detector (µv) 4.4 x 10E 5

12 Example MIP Log: Skuldelev SK05 PID Detector (µv) 4.4 x 10E 5 XSD Detector (µv) 7.4 x 10E 5 Scale is Important!

13 Incremental Probing & Trip Time Stop incrementally to let the contaminants travel up trunkline to the detector L = 1 foot ~ 30 cm

14 Correlating MIP Detector to Groundwater Samples 71 mg/l (PCE+TCE+DCE+VC)

15 The HPT Probe & System Trunkline Connections Injection Screen EC Array Replaceable Screens

16 D HPT Principles of Operation C A B E A) Water Tank B) Pump & Flow Meter C) Electronics/computer Inject Water at 300 ml/min Advance Probe at 2 cm/sec F G D) Trunkline E) Pressure Sensor F) Screened Injection Port G) Elec. Conductivity Array 16

17 D HPT Interpretation C A B E HPT Pressure Rule of Thumb: Hi Pressure >> Lo Permeability F Low Pressure >> Hi Permeability G 17

18 HPT QA/QC HPT Probe in Reference Tube to Verify 6 Water Pressure = 0.22 psi (1.52kPa) HPT Pressure Transducer Onscreen QA Report (data saved to log file)

19 Example HPT Log: Skuldelev SK05 Electrical Conductivity (ms/m) 19

20 Example HPT Log: Skuldelev SK05 HPT Pressure (kpa or psi) 690kPa = 100 psi 20

21 Example HPT Log: Skuldelev SK05 HPT Flow Rate (ml/min) 21

22 Example HPT Log: Skuldelev SK05 HPT Pressure Rule of Thumb: Hi Pressure >> Lo Permeability Low Pressure >> Hi Permeability 22

23 Example HPT Log : Skuldelev SK05 HPT Pressure Rule of Thumb: Hi Pressure >> Lo Permeability Low Pressure >> Hi Permeability EC Anomaly? 23

24 Correlating HPT Pressure to Soil Cores Sand & Gravel Clay -Till 24

25 HPT and Hydrostatic > Corrected Pressure > Est K Dissipation Tests

26 HPT and Hydrostatic P > Corrected P > Est K f (Q/Pcorr) = Est K Dissipation Tests

27 Combining MIP and HPT Probes Trunkline Connections MIP Membrane Heater Block HPT Injection Screen MiHpt EC Array

28 The MiHpt Log: SK05 at Skuldelev Electrical Conductivity

29 The MiHpt Log HPT Pressure & Flow

30 The MiHpt Log PID Detector XSD Detector

31 Location of Skuldelev, Denmark

32 Skuldelev Geology Glaciated Region Site underlain by glacial till and related unconsolidated deposits

33 Skuldelev Site Map North SK12 Pond SK05 SK04 MiHpt Log X Cross section Line GW Plume & Hot Spot Manufacturing Bldg SK01 PCE, TCE, DCE & VC Logs are spaced 8 m (~25ft) apart. 33

34 EC at this site did not differentiate between the clay-till and the sand & gravel Skuldelev Site Map North SK12 Pond SK05 SK04 MiHpt Log X Cross section Line GW Plume & Hot Spot Manufacturing Bldg SK01 PCE, TCE, DCE & VC Logs are spaced 8 m (~25ft) apart. 34

35 Skuldelev Log Location & Site Map North SK12 Pond SK05 SK04 MiHpt Log X Cross section Line GW Plume & Hot Spot Manufacturing Bldg SK01 PCE, TCE, DCE & VC Logs are spaced 8 m (~25ft) apart. 35

36 Skuldelev Log Location & Site Map North SK12 Pond SK05 SK04 MiHpt Log X Cross section Line GW Plume & Hot Spot Manufacturing Bldg SK01 PCE, TCE, DCE & VC Logs are spaced 8 m (~25ft) apart. 36

37 Sand & Gravel Skuldelev SK04 Location Log Clay-Till No EC Increase at Clay-Till 37

38 Sand & Gravel Skuldelev SK04 Location Log Clay-Till Pressure Increase at Clay-Till 38

39 Sand & Gravel Skuldelev SK04 Location Log XSD = red PID = Green PCE TCE DCE VC Clay-Till ~ND 39

40 Skuldelev Log Location & Site Map North SK12 Pond SK05 SK04 MiHpt Log X Cross section Line GW Plume & Hot Spot Manufacturing Bldg SK01 PCE, TCE, DCE & VC Logs are spaced 8 m (~25ft) apart. 40

41 EC = poor definition of clay till Skudelev SK12 MiHpt Log

42 Skudelev SK12 MiHpt Log Sandy Aquifer = low pressure Contact Clay-Till = Hi P

43 Skudelev SK12 MiHpt Log In the clay-till PID = 1 x 10E7 µv XSD = 1 x 10E7 µv

44 Skuldelev : Cross Section North SK12 Pond SK05 SK04 MiHpt Log X Cross section Line GW Plume & Hot Spot Manufacturing Bldg SK01 PCE, TCE, DCE & VC Logs are spaced 8 m (~25ft) apart. 44

45 Skuldelev : Cross Section North SK12 Pond SK05 SK04 MiHpt Log X Cross section Line GW Plume & Hot Spot Manufacturing Bldg SK01 PCE, TCE, DCE & VC Logs are spaced 8 m (~25ft) apart. 45

46 East Skuldelev HPT Pressure X-Section (Elevation Corrected) West SK01 SK04 SK05 SK12 (Facing ~ Southwest) 46

47 East Skuldelev HPT Pressure X-Section (Elevation Corrected) West SK01 SK04 SK05 SK12 47

48 East Skuldelev HPT Pressure X-Section West SK01 SK04 SK05 SK12 48

49 East Skuldelev HPT Pressure X-Section = hydrogeologic model = CSM West SK01 SK04 SK05 SK12 Buried Stream Valley (filled with sand & gravel) 49

50 East Skuldelev HPT Pressure and XSD Cross Section West SK01 SK04 SK05 SK07 SK12 XSD (µv) 50

51 East Skuldelev HPT Pressure and XSD Cross Section West SK01 SK01 SK04 SK05 SK05 SK07 SK07 SK12 SK12 XSD (µv) 51

52 East Skuldelev HPT Pressure and XSD Cross Section West SK01 SK04 SK05 SK07 SK12 XSD (µv) 52

53 East Skuldelev HPT Pressure and XSD Cross Section West SK01 SK04 SK05 SK07 SK12 XSD (µv) 53

54 Skuldelev Location & Site Map North SK12 Pond SK05 SK04 MiHpt Log X Cross section Line GW Plume & Hot Spot Manufacturing Bldg SK01 PCE, TCE, DCE & VC Logs are spaced 8 m (~25ft) apart. 54

55 Skuldelev Location & Site Map North SK12 Pond SK05 SK04 MiHpt Log X Cross section Line GW Plume & Hot Spot Manufacturing Bldg SK01 PCE, TCE, DCE & VC Logs are spaced 8 m (~25ft) apart. 55

56 Example HPT Log: Skuldelev SK05 EC Anomaly? 56

57 0 1 EC (ms/m) SK05 Location Depth (meters) HPT Press. Max (kpa)/ 3 Turbidity [NTU] GW Specific Cond. (µs/cm)/10 EC & HPT Pressure Groundwater specific conductance EC(mS/m) : Pressure (kpa/3) : Spec. Cond. (µs/cm)/10 57

58 Skuldelev Location & Site Map North SK12 Pond SK05 SK04 MiHpt Log X Cross section Line GW Plume & Hot Spot Manufacturing Bldg SK01 PCE, TCE, DCE & VC Persulfate Injection Logs are spaced 8 m (~25ft) apart. 58

59 Skuldelev Location & Site Map North SK12 Pond SK05 SK04 MiHpt Log X Cross section Line GW Plume & Hot Spot Manufacturing Bldg SK01 PCE, TCE, DCE & VC Persulfate Injection Logs are spaced 8 m (~25ft) apart. 59

60 East Cross Section with HPT Pressure & EC Electrical Conductivity (ms/m) 600 West SK04 SK05 SK07 SK08 SK09 SK10 SK11 HPT Pressure (kpa) 60

61 East Cross Section with HPT Pressure & EC Electrical Conductivity (ms/m) 600 West SK04 SK05 SK07 SK08 SK09 SK10 SK11 High EC in a Sand formation indicates ionic contaminants HPT Pressure (kpa) Mapping distribution of persulfate in the subsurface 61

62 MiHpt Summary Combined MIP + HPT Probe Simultaneously Provides: MIP Detector Logs (where is it? how much?) HPT Pressure Log (lithology, hydrostartigraphy) EC log

63 MiHpt Summary Cross Sections with HPT Pressure Logs Provide: Lithologic information Hydrogeologic model for the site Geologic cross sections Gray Clay-Till (High HPT Pressure)

64 MiHpt Summary Cross Sections with MIP Detector Logs and HPT P Logs: Lithologic control on contaminant migration (migration pathways) Conceptual site model development

65 MiHpt Q&A

66 Estimating Hydraulic Conductivity (K) from HPT Pressure and Flow Logs

67 HPT Dissipation Test Dissipation Tests Flow OFF Flow ON Stable Pressure

68 HPT and Hydrostatic > Corrected Pressure > Est K Flow OFF Dissipation Tests Stable Pressure Flow ON

69 HPT and Hydrostatic > Corrected Pressure > Est K Piezometric Profile

70 HPT and Piezometric P > Corrected P > Est K Static Water Level

71 HPT and Piezometric P > Corrected P > Est K Corrected HPT Pressure

72 HPT and Piezometric P > Corrected P > Est K f (Q/P corr) = Est K K = Hydraulic Conductivity