Sensory Reception Sensory Receptors Sensory Receptors Photoreception Mechanoreception.
Comprehensive Understanding of Emissions and Control Measures Provide Protectiveness to Potential...
-
Upload
donald-carpenter -
Category
Environment
-
view
193 -
download
0
Transcript of Comprehensive Understanding of Emissions and Control Measures Provide Protectiveness to Potential...
COMPREHENSIVE UNDERSTANDING OF EMISSIONS AND CONTROL MEASURES PROVIDE PROTECTIVENESS TO POTENTIAL RECEPTORS
Donald Carpenter
Thomas Fischer
Brian Magee
Robert Ferree
Jing Gabriel
PROJECT LOCATION HAS IMPORTANT REMEDIAL IMPLICATIONSSEVERE COLD AND HEATRECORD HIGH 115° FRECORD LOW -46° FLARGEST TEMPERATURE EXTREME ON EARTH – per The Weather ChannelSEVERE THUNDERSTORMS AND HIGH WINDSLimited Construction Season
High Required Production Rates
Hot and Windy
CLOSE PROXIMITY OF RESIDENCES EMPHASIZES IMPORTANCE OF UNDERSTANDING EMISSIONS
200 meters
SIGNIFICANT COAL TAR WASTES ARE KNOWN TO BE PRESENT
BENZENE 76 ppm (most significant toxicant)NAPHTHALENE 1,500 ppm (most significant malodorant)PHENANTHRENE 400 ppm (potential toxicant)
Preliminary off-gas emissions “bounding case” modeling suggested exceedances of applicable occupational standards at “reasonable” production rates
Inspired interest in a trial excavation to determine emissions potential
THE INVENTORY OF OFF-GAS EMISSION SOURCES MUST BE ACCURATELY SIMULATED
Primary Excavation
Stockpiled Material
Loading into Highway Trucks
TRIAL EXCAVATION FOLLOWED A PROVEN APPROACH
Atmospheric conditions
Concentration of Contaminant
(Soil)
Mass of Soil Disturbed per Unit
TimeDegree of
Disturbance
Concentration of Off-Gas Downwind
Backmodeling allows estimate as to the “RELEASE FRACTION”
MULTIPLE SUMMA CANISTERS PROVIDE DATA FOR ENTIRE INVENTORY OF EMISSIONS
Canisters #1 and #5 – Continuous (50 minute samples)
Canister #2 – Active Excavation (10 minute sample)
Canister #3 – Passive Emission (30 minute)
Canister #4 – Secondary Handling (10 minute)
WORST CASE MODELING DEMONSTRATES SHORT TERM PROTECTIVENESS TO THE COMMUNITY
580 ug/M3
MODELING RESULTS DEMONSTRATE LONG TERM PROTECTIVENESS TO THE COMMUNITY
4.5 ug/M3
NUISANCE ODORS WOULD BE LARGELY CONFINED TO THE SITE
SYSTEMATIC ANALYSIS OF CONTROL MEASURES CAN PROVIDE INSIGHT INTO PROTECTIVENESS
LINEAR DECREASE IN CONCENTRATIONS IS FOUND RELATIVE TO PERCENT SUPPRESSION
0% 20% 40% 60% 80% 90%0
100
200
300
400
500
600Relationship Between Estimated Concentration and Percent Relative Off Gas Suppression
Concentration
Percent Relative Off Gas Suppression
EFFICACY OF A SPRUNG STRUCTURE IS LIMITED BY EFFECTS OF AN ACCIDENTAL RELEASE
PUBLIC EXPOSURE CONCENTRATION DURING ACCIDENTAL RELEASE (g/m3) - 5 MINUTE DURATION
CONCENTRATION WITHIN CONFINING STRUCTURE (g/m3)
VENTILATION RATE OF AIR TREATMENT SYSTEM (acfm)
LIMITING FACTOR
3,200 54,000 18,000 3,200 g/m3 (5 min) Exposure Limit
16,000 250,000 3,600 16,000 g/m3 (5 min) Exposure Limit
18,000 283,000 3,200 580 g/m3 Short Term Exposure Limit During Routine Ops (1 hr) and Limit for Level C PPE
COMPREHENSIVE UNDERSTANDING OF EMISSIONS AND CONTROL MEASURES PROVIDE PROTECTIVENESS TO POTENTIAL RECEPTORSTHE INVENTORY OF OFF-GAS EMISSION SOURCES MUST BE ACCURATELY SIMULATED
MULTIPLE SUMMA CANISTERS PROVIDE DATA FOR ENTIRE INVENTORY OF EMISSIONS
WORST CASE MODELING DEMONSTRATES SHORT TERM PROTECTIVENESS TO THE COMMUNITY
MODELING RESULTS DEMONSTRATE LONG TERM PROTECTIVENESS TO THE COMMUNITY
NUISANCE ODORS WOULD BE LARGELY CONFINED TO THE SITE
LINEAR DECREASE IN CONCENTRATIONS IS FOUND RELATIVE TO PERCENT SUPPRESSION
EFFICACY OF A SPRUNG STRUCTURE IS LIMITED BY EFFECTS OF AN ACCIDENTAL RELEASE