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Mercury Impacted Soil Cleanup at a Natural Gas Processing Facility Gilbert J. Van Deventer, REM...
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Mercury Impacted Soil Cleanup at a Natural Gas Processing Facility Gilbert J. Van Deventer, REM Trident Environmental PO Box 7624 Midland, Texas 79701 www.trident- environmental.com
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Transcript of Mercury Impacted Soil Cleanup at a Natural Gas Processing Facility Gilbert J. Van Deventer, REM...
Mercury Impacted Soil Cleanup at a Natural Gas Processing Facility
Gilbert J. Van Deventer, REM
Trident Environmental
PO Box 7624
Midland, Texas 79701www.trident-environmental.com
Project Elements
Disposition of 32 mercury manometer gas flow meters stored in the crawl space of an office at a natural gas processing facility in east Texas
Characterization of mercury-impacted soil in crawl space floor
Remediation of mercury-impacted soil in crawl space
Safety Concerns
Mercury vapors inside crawl space exceed permissible exposure limits (PELs)
Confined space entry procedures must be followed
Level B personal protective equipment (PPE) required
Jerome Model 431X mercury vapor analyzer (MVA) used for monitoring
Vapor Exposure Limits for Mercury
ACGIHTLV PEL STEL-Ceiling REL-TWA REL-Ceiling
mg/m3 mg/m3 mg/m3 mg/m3 mg/m3 mg/m3
0.025 0.05 0.1 0.05 0.1 10
ACGIH - American Conference of Governmental HygienistsNIOSH - National Institute for Occupational Safety and HealthOSHA - Occupational Safety and Health Administration
IDLH - Immediately Dangerous to Life and HealthTLV - Threshold Limit ValuePEL - Permissible Exposure LimitREL - Recommended Exposure LimitTWA - Time-Weighted Average (8-hour work day; 40-hour work week)STEL - Short Term Exposure Limit (15 minute)
Acronyms
IDLHOSHA NIOSH
Organizations
Disposition of 32 mercury manometer gas flow meters
Meters were removed from crawl space
Meter components were disassembled
Mercury bearing components placed in 55-gal. steel drums
Meters were shipped to a permitted facility for recycling
Characterization of MercuryImpacted Soil in Crawl Space
Sample grid pattern established in crawl space based on 5-foot centers (same as steel piers supporting office building)
Composite samples from each grid cell collected were screened with an MVA and submitted to the laboratory for total mercury analysis (EPA Method 7471)
Sampling Grid Pattern
GRID 0 1 2 3 4 5 6 7 8 9 10
A A1 DoorFoundation
Steel Pier
B B1 B2 B3 B4 B5 B6 B7
C C1 C2 C3 C4 C5 C6 C7 N
D D1 D2 D3 D4 D5 D6 D7
E E1 E2 E3 E4 E5 E6 E7
F
Woo
dD
eck
Remediation of MercuryImpacted Soil in Crawl Space
Phase 1: Soil removed using hand shovels Phase 2: Remaining loose soil removed using industrial
vacuum Phase 3: MerconwashTM (1.5 liters ) mercury vapor
suppressant and decontamination liquid applied to floor of crawl space
Phase 4: MerconwashTM (10 liters ) mercury vapor suppressant and decontamination liquid applied to floor of crawl space 8 months after initial remediation activities
MVA Readings Prior to Implementation of Remediation
0.026Door
Steel PierFoundation
>0.999 0.897 0.057 0.026
0.086 >0.999 0.031 0.022
0.088 0.681 0.018 0.021
0.056 0.017 0.026 0.022
Values in grids above indicate mercury vapor analyzer readings (mg/m3)
prior to implementation of remediation activities.
UNUSED AREA
NO ENTRY
MVA Readings During Implementation of Remediation
0.003
0.129 0.094 0.079
0.211 0.116 0.078
0.122 0.115 0.085
0.090 0.089 0.087
Values in grids above indicate mercury vapor analyzer readings (mg/m3)
during implementation of remediation activities (excavation and vacuuming).
UNUSED AREA
NO ENTRY
MVA Readings After Completion of Remediation
0.011
0.021 0.008 0.013 0.008
0.015 0.017 0.012 0.009
0.017 0.013 0.011 0.010
0.010 0.011 0.009 0.011
Values in grids above indicate mercury vapor analyzer readings (mg/m3)
after completion of remediation activities (excavation, vacuuming andspraying of Merconwash).
UNUSED AREA
NO ENTRY
Total Mercury ConcentrationsAfter Completion of Remediation
24.3Door
Steel PierFoundation
41.7 44.0 27.0 1.6
11.4 39.0 17.3 1.6
12.8 32.2 6.0 1.6
9.9 8.3 2.0 1.6
Values in grids above indicate mercury concentrations (mg/kg)
after completion of remediation activities (excavation, vacuuming andspraying of 1.5 liters of Merconwash).
UNUSED AREA
NO ENTRY
MVA Readings After Applicationof 10 liters of Merconwash
0.000 DoorFoundation
Steel Pier
0.000 0.000 0.000 0.000 0.000 0.000 0.000
0.000 0.000 0.003 0.000 0.000 0.000 0.000
0.000 0.000 0.002 0.000 0.000 0.000 0.000
0.000 0.000 0.000 0.001 0.000 0.000 0.000
Values in grids above indicate mercury vapor analyzer readings (mg/m3)
after application of 10 liters of Merconwash (8 months after initialremediation activities).
Summary of MVA ReadingsGrid 8/25/98 8/27/98 4/14/99 4/15/99
A1 0.026 0.011 0.000 0.000
B1 >0.999 0.021 0.005 0.000
B2 0.897 0.008 0.007 0.000B3 0.057 0.013 0.003 0.003B4 0.026 0.008 0.000 0.000C1 0.086 0.015 0.003 0.000C2 >0.999 0.017 0.015 0.000C3 0.031 0.012 0.006 0.002C4 0.022 0.009 0.000 0.000D1 0.088 0.017 0.001 0.000D2 0.681 0.013 0.012 0.000D3 0.018 0.011 0.003 0.000D4 0.021 0.010 0.000 0.000
E1 0.056 0.010 0.004 0.000
E2 0.017 0.011 0.002 0.000
E3 0.026 0.009 0.002 0.000
E4 0.022 0.011 0.001 0.000
Explanation:
8/25/98 MVA readings obtained prior to initial remediation activities.8/27/98 MVA readings obtained after completion of initial remediation activities.4/14/99 MVA readings obtained 7.5 months after completion of initial remediation activities.4/15/99 MVA readings obtained 18 hours after application of 10 liters of Merconwash.
MVA Readings in Office Above Crawl Space
BATH ROOM
AC
HALL
OFFICEOFFICE
STORAGE ROOM OFFICE OFFICE
0.000 0.000 0.000
0.000
0.000
0.000 0.000
0.00
0
0.000
0.000
0.000
0.000
0.000 0.003
0.000
0.000
0.000
0.000
0.000
0.000
0.000 0.000 0.000 0.000
0.000
0.000
0.000
0.000
0.000
0.0000.000
0.000 0.000
0.000
0.000
0.000 0.000 0.000 0.000
0.000
0.000
0.0000.000
0.000
0.000
0.000
0.000
0.000
0.0000.000
0.000
(ATTIC)
0.000
0.000
0.000
