Document RakzbXxdnR3jXkVnv0qEV3OBE

FILE NAME: Union Carbide (UC) DATE: 2006 Dec 5 DOC#: UC386 DOCUMENT DESCRIPTION: EPA PowerPoint at the Clear Creek Management Area to N O A at the Clear Creek Management Area Collaborators EPA IX Arnold Den Daniel Stralka Jackie Lane Lynn Suer Project Manager EPA ERT Brian Brass BLM Tim Moore December 5,2006 IEPA Steve Ross CH2MHI US Coast Guard \ {COMA) Hazardous Asbestos Area ggripriiiHimitimiiiTinnn[TfTmmnpnnTmrninn[rmrnmrffmnnrmm nnrnrnrnnffffnffffflffnrmffffnffmi San Benito Evening Primrose Typical CCMA Activities >Off-Highway Vehicle Riding: Motorcycles, ATV's, SUVs >Hiking, Botanizing, Rock Hunting, Camping, Hunting, Native American Ceremonies v* Soil: Percent Asbestos CCMA Route otorcycle ATV SUV Range 2% -15% 1% - 10% .0 (n=5) 5.5 (n=6) 3.9 (n=9) 4.9 (n=4) Study Goal >Obtain information to assist the Bureau of Land Management in making management decisions to protect human health Studv Questi*ons , How is asbestos exposure related Specific Recreational Activities? Child vs. Adult? Variations with weather, soil moisture and asbestos concentrations? >What are the cancer risks? Study Design >Monitoring Exposure ' Quantifying Exposure * Assessing Variation ^ Assessing Risk Monitoring Exposure )r\ Activity-based Sampling Motorcycle and ATV riding, SUV driving, hiking, camping, SUV washing/vacuuming, fence-building . Height-related differences in exposure > Stationary (ambient) Sampling Inside/outside of the hazardous zone PA Vu lurn ^ ............' " ' ^ :! I 1 f ; h \ ' *U'? v sV .W '' ^'>\ V 4 \ Adult & Child SUV Co-located Adult Samplers Study Des Monitoring Exposure Assessing Variation Assessing Risk Quantifying Exposure > Transmission Electron Microscopy ^ International Standard ISO 10312 Standard definitions of fiber types Counting Rules W IiBKKttW - Binning Phase Contrast Microscope equivalent (PCME) fibers Other fiber categories Clusters pulmonary alveolar macrophage cell attempting to engulf and Ingest several Iona crocidolite can lead to extensive `selective release* of proteolytic enzymes and ROS from the `frustrated* PAMs CCMA asbestos Short and Amphibole-Free??? E nvironm ent E. Ilgreng E. Chatfieldb 3 Consultant Physician, Bryn Mawr, Pa., USA; b Consultant Industrial Hygienist, Toronto, Canada Original Paper Indoor Built Environ 1998;7:18-31 Coalinga Fibre - A Short, Amphibole-Free Chrysotile Part 2: Evidence for Lack of Tumourigenic Activity September (dry soil) Asbestos Concentrations (PCME fibers/cc) Lead Mid Tail or Motorcycle SUV Sam pler fs 't Study Design * Monitoring Exposure * Quantifying Exposure -Assessing Variation ^ Assessing Risk Assessing Variation ^Scenario repetition . 1-2 times/day X 2-3 days ^Seasonal sampling September, 2004 (dry) . November, 2004 (moist) . February, 2004 (wet) . September, 2005 (dry) Assessing Variation > Ambient air and weather monitoring 4 stations/event Upwind/downwind > Soil moisture and asbestos concentrations 3 samples/route/day * Dust generation . Photodocumentation of dust plumes/event Ambient Air and Meteorologica Monitoring Staging Arsa 2 Study Design Monitoring Exposure Quantifying Exposure Assessing Variation Assessing Risk ,, PCM-equivalent (PCME) fibers i> 5 pm long, 0.2 - 3.0 pm wide, > 3:1 aspect ratio) ,, EPA (IRIS) Cancer Slope Factor - adult risk ,, Nicholson (1986) Life Tables - child risk ^ Exposure Assumptions (BLM, 1992) Male Cancer Risk for 10 years Continuous Exposure vs. Age at First Exposure Exposure Assumptions (BLM, 1992) V 1 day/year > 5 days/year = Reasonable Maximum Exposure > 12 days/year = High estimate > 30 year exposure averaged over 70 year November (moist soil) Maximum Asbestos Concentrations (PCME fibers/cc) Seasonal Comparison of Maximum Adult vs. Child Motorcyclist (PCNIE fibers/cc) min Lim it PC * H w Sw W' m Ad ull Child Adult vs. Child Max. Exposures ME fibers/cc) POME Exposures d Activities (P suve  \/ CC lL vf ' PrY; mit4 *ion anda slov.) Comparison of September and November Max. Excess Lifetime Cancer Risk (ELCR) for Motorcycle riding Conclusions To Date ^ Asbestos exposure is greatest for trailing OHV riders > Exposure for trailing riders frequently exceed OSHA PEL ^ Exposure for trailing riders sometimes exceeds the 30 minute Excursion Limit ^ Cancer risk exceeds 1 X 10-4 for trailing Conclusions (cont.) - Child exposure greater than adults for same activities ^ Exposures exceeding OSHA standards can occur during moist (November) or wet (February) conditions . Reasonable Maximum Exposure (RME) Risk can exceed 1 X 10*4 (CERCLA risk management range) during moist conditions - Exposure is not correlated with differences in soil asbestos or soil moisture at levels reported to date February (wet soil) Max. Asbestos Concentrations (PCME fibers/cc) 0 .1 a 0.14 wm^ DPIShmShw 1 0.12 0.08 0.06 0.04 Motor A TV H**. BL.M Deeort Assessing Variation: nfall vs. Sampling Events Precipitation Rain in inches Mean Soil Moisture: Dry (Sept) and moist (Nov) ATV SUV Hiking November (moist) RME Excess Lifetime Cancer Risk (ELCR) Asbestos exposure levels, soil moisture and soil asbestos concentrations