Sources Used in Preparation of this Document

Canadian Center for Occupational Health and Safety website:

OSHA fact sheet about quartz silica:

World Health Organization fact sheet:

National Toxicology Program, Department of Human Health and Services- Report on Carcinogens, 11th Edition: OSHA Silica Advisor:

Page 5 of 6iAmerican Journal of Respiratory and Critical Care Medicine: We found an increased risk of total mortality associated with each 10-μg/m


increase in average PM2.5 over

the entire follow-up period. Conclusion: Total, cardiovascular, and lung cancer mortality were each positively associated with ambient PM2.5 concentrations. Reduced PM2.5 concentrations were associated with reduced

mortality risk. American Thoracic Society, 2006 International Conference: Abstract B16. Presented May 22, 2006

The study showed that each increase of 10 μg/m2 of PM10 over 2 years increased the risk of death by 32% for patients with diabetes, by 28% for patients with COPD, by 27% for patients with congestive heart failure, and by 22% for people with inflammatory diseases such as rheumatoid arthritis or lupus.

ii Environmental Health Perspectives, Supplements Volume 108, Number S4, August 2000, “Agricultural Lung Diseases.”

Very high concentrations of inorganic dusts are generated by field activities such as plowing, tilling, haying, and harvesting. The bulk of the inorganic dusts are silicates. These include crystalline silica (quartz) and noncrystalline amorphous silica (diatomite). Newer tractors with enclosed cabs containing air filtration can decrease

33 respirable dust exposure from an average of 2-20 mg/m to 0.1-1 mg/m .

Inorganic dusts, however, do not contribute to agricultural respiratory disease to the same extent as organic dusts. Furthermore, the weathering effects upon respirable quartz dusts generated by agriculture are considered to be less pathogenic than the freshly fractured quartz dust generated by industrial processes such as mining, quarrying, and sandblasting. Diatomaceous silicate inorganic dusts are also considered to have relatively nontoxic pulmonary properties (7).

7. American Thoracic Society. Respiratory health hazards in agriculture. Am J Respir Crit Care Med 158:S1- S76 (1998)

iiiThe Air Quality Permit issued to Canadian Sand and Proppants, Inc. ( transferred to EOG Resources in May 2010 ) is based on a wrong theory of science. It claims that a safe level of PM10 guarantees a safe level of Silica Dust. This is not necessarily true. One has to know the percent of PM10 that is silica dust in order to make this claim. The amount of respirable silica dust could change, depending on the area of the quarry being mined, how much blasting is done, and other factors.

Courteous, concise comments relevant to the topic are welcome, whether or not they agree with the views that predominate here. Long rants proclaiming the infallibility of your own views or favorite ideology will not be posted, neither will repeated attempts to hammer on a point already addressed, nor will comments containing profanity, abusive language, flame-baiting and name calling. Please indicate precisely what you are blogging about. I just got a post from ? E-Mail ? which said: "Is this going to be OUR furture??. I have no idea what they were referring to and no way to contact them. This is why we prefer comments that are signed by actual persons who leave their E-Mail address (it won't be published) so they can be contacted if questions arise.

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