Hydraulic fracturing in the United States with hydraulic fracturing activity versus those without, with each well addition increasing rates of accidents by 2% and risk of fatality by .6%. Rig-Up and Rig-Down are terms used to refer to the delivery, construction, dismantling and breakdown of equipment required throughout the hydraulic fracturing process. Incidents and fatalities during rig-up/rig-down operations may result if struck or crushed by the heavy equipment involved. Hazards during Mixing and Injection Workers may be exposed to dangerous chemicals while mixing and injecting fluids used in hydraulic fracturing. Potential chemicals include, hydrochloric and hydrofluoric acid, biocides, methanol, ethylene glycol, guar gum, polysaccharides and polyacrylamides,
Guar gum also known to cause small sores or lesions as well as chronic diarrhea (IBS). Manufacturers and suppliers will sometimes substitute guar Gum, xanthan gum and cellulose gum in formulations, without changing product labels. Often, blends of all these ingredients are sold as cellulose gum. If allergic to guar gum, the most common foods to suspect contamination from are frozen dairy/ice treats, soft cheeses (cream cheese, ricotta), salad dressing and baked goods. In July 2007, the European Commission issued a health warning to its member states after high levels of dioxins were detected in a food additive - guar gum -