| http://www.w3.org/ns/prov#value | - Nevertheless, contamination of groundwater below the STU is a concern, especially in areas with shallow groundwater tables.In order to protect drinking water, the separation distance between the infiltrative surface of the STU and fluctuating water table has to be determined on a site-by-site basis, and seasonal variations in separation distance have to be considered to avoid microbial contaminati
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