CPT and MiHpt Programs Bayou Corne 8 AUG 2013
Agenda Introduction and purpose of meeting Why CPT and MiHpt Charlie Faust, Tt CPT and MiHpt overview Charlie Faust, Tt Program progress Charlie Faust, Tt LDNR assessment of CPT and MiHpt Gary Hecox, CB&I Plan forward Faust, Hecox and John Boudreaux, AOEP
Introduction and purpose of meeting Provide technical details and program objectives Discuss progress and planned work Answer questions
Why CPT and MiHPT Alternative to installing wells Less intrusive Faster Better definition of subsurface Can be used to evaluate gas depletion in MRAA and soils above MRAA
CPT and MiHpt Probes pushed or hammered into ground to characterize the subsurface soil Cone Penetrometer Testing (CPT) Geotechnical applications Measures tip pressure, sleeve friction, pore pressure Determines soil strength, soil type, groundwater conditions MiHpt Environmental applications Membrane interface probe (Mip) Measures ionization response in carrier gas exposed to soil Correlated to contamination Hydraulic profile tool (Hpt) Measures pore pressure, injection flow rates, EC, temperature Correlated to permeability and soil type
CPT REPORT - STANDARD ARDAMAN 12-84-2910E.GPJ CPT V3.0.GDT 5/9/13 t CPT Report Napoleonville Salt Dome Cone Penetration Test CPT-3 Northing: #: Easting: Project 12-84-2910E Date: May. 9, 2013 Elevation: Total Depth: 140.0 ft D e p t h ( f t ) Sleeve Friction Tip Resistance f s qt (tsf) (tsf) 1 2 3 120 240 360 480 Pore Friction DPressure eratio p tsb h T Rf MAI ( Rf f t = ) 1 u2 (%) (1 986) (tsf) 2 4 6 1 2 3 4 5 6 7 8 9 1011 0 4 8 8 1 2 0 4 5 1 0 > > 1 5 > > 2 0 2 5 3 0 > > 3 5 4 0 > > 4 5 > > 5 61 18 24 21 4 - sensitive silty clay fine to grained clay q 0 25 - clayey organic silt material to silty clay ( 36 Page1of1 - sandy clay silt to clayey silt 10 - gravelly 7 - silty sand to to sandy sand silt CPT-3 11 - very 8 - stiff sand fine to grained silty sand (*) 12 - sand 9 - sand to clayey sand (*) t 5s f 5)
MiHpt Report
Program Progress CPT 74 sounding locations completed Grouting and interpretation issues addressed MRAA top defined Gas zones detected Penetration into MRAA improved
Map of Installed CPT locations
Elevation of Top of MRAA
Geologic Cross Section Based on CPT Data NW SE
Map of Gas Shows
Program Progress MiHpt 12 soundings completed Grouting issues addressed Methane can be detected Comparison to CPT ongoing
MiHpt Locations Completed and Planned
Review of CPT Program Gary R. Hecox, Ph.D. CB&I
Quality Control Checks on Depths and Check for pressure stability of dissipation tests using standard QC methods Check for depth of CPT- -did it get into the MRAA? Check interpretation of gas intervals Test Results Stable Test Depth Class=04 Deep, PointID=CPT-35W, Depth_ft=123.852 Not Stable Test Overlay Plot Depth Class=04 Deep, PointID=CPT-35W, Depth_ft=127.789
CPT Depth Checking Limited MRAA Penetration Good MRAA Penetration
CB&I CPT Review Conclusions CB&I recommends lifting of cease and desist order Allow CPT/MiHPT investigation to proceed in Bayou Corne community Implement DNR grout oversight program (written records, grout samples, standard written procedure for re-grouting) Dissipation test stability/interpretation issues resolved Ongoing evaluations CPT can definitely identify at least some gas intervals map with other gas data Defining no gas areas using CPT more problematic, appear to be some false negatives where CPT shows no gas but other data indicate there is gas (e.g. well pressure, bubbling). Some CPTs can only get a few feet into MRAA others get deeper MiHPT has similar depth limitations; direct detection of methane very positive attribute Some early CPTs need to be redone or twin with MiHPT
Plan forward CPT Propose testing in community and test as soon as approved Address platform stability for sites in marsh and bayous Identify locations and resound where necessary Complete planned soundings MiHtp Calibrate FID response with known gas shows Twin with CPT locations in community Determine additional locations and conduct soundings
Map of Planned CPT Locations
Schedule of Activities
Questions?
Existing ORW Wells