Results show that beach geomorphology (beach type) was highly associated with exceedance of regulatory standards.
Exceedance of PAH standards can occur after invasive repairs in cast iron water mains, but our estimates suggest that human health risks related to coated cast iron water mains are low.
Under normal operation (samples for undisturbed 1 and 2), we observed no exceedances of PAH standards (Table 2).
Of all the domestic and public wells studied, exceedances of EPA standards occurred for uranium in 4 17% of wells sampled, for combined radium in 3 4% of wells sampled, for gross alpha radioactivity in 12 16% of wells sampled, and for beta radioactivity in 9% of wells sampled.
More specifically, dynamic models are suggested, as possible exceedance of the quality standards can be predicted by such models.
As risk of exceedance of environmental quality standards is mainly recognized in catchments dominated by cropland, the IIMF is well suited for assessing the nutrient component of the WFD ecological status.
The IIMF is applied to assess impacts of climatic and socio-economic drivers on agricultural land use (crop choices, farming practices and fertilization levels), river flows and the risk for exceedance of environmental quality standards for determination of the ecological water quality status in Austria.
Next the proportion of cases associated with nitrate was inferred from section 'Increased risk of colon cancer due to exceedance of the nitrate standard in drinking water', where we assume that of the population exposed to NO3 concentrations above 25 mg/L the half that consumes more than the median amount of meat, has a risk of colon that is twice as high as for the total population (eq. 4).
Where climate change is projected to result in an increased frequency of stable anticyclonic conditions with little boundary layer ventilation and associated high temperatures, cloud-free conditions, and large solar radiation inputs, exceedance of current air quality standards will likely occur (Hogrefe et al. 2004a; Mickley et al. 2004; Murazaki and Hess 2006; Sousounis et al. 2002).
The region studied includes Los Angeles County, which has been designated a "nonattainment area" based on exceedance of the national regulatory standard for CO.
For instance, 85 counties with ozone monitors documented exceedance of the 80-ppb standard in early 2008, but that translated to 337 counties after the EPA and state and local officials estimated and negotiated which areas were in violation, accounting for those areas without monitors.
