Tellus Drainage Sample Locations Tellus Drainage The drainage dataset contains stream waters and stream sediment analysis and are a combination of two surveys. The first, the G-Base survey, was carried out between 1994 and 1996 in the west of Northern Ireland. In 2005 and 2006 a second survey was carried out as part of the Tellus project in the areas not covered by the original survey. Stream waters The G-Base samples (1994-1996) were analysed for the following anions and fluid parameters: Bicarbonate, Chloride, Fluoride, Nitrate, Sulphate, Dissolved Organic Carbon, Conductivity, pH. Samples were analysed for the tracer elements Ag, Al, Al, As, B, Ba, Be, Ca, Cd, Ce, Co, Cr, Cu, Fe, K, La, Li, Mg, Mn, Mo, Na, Ni, P, Pb, Rb, Sb, Se, Si, Sr, Tl, U V, Y, Zn, Zn, Zr. The Tellus samples (2005-2006) were analysed for the following anions and fluid parameters: Bicarbonate, Bromide, Chloride, Fluoride, Nitrate, Nitrite, Orthophosphate, Sulphate, Dissolved Organic Carbon, Alkalinity, Conductivity, pH. Samples were analysed for the trace elements Ag, Al, As, Au, B, Ba, Be, Bi, Ca, Cd, Co, Cr, Cs, Cu, Fe, Hg, Ho, K, La, Li, Mg, Mo, Mn, Na, Ni, P, Pb, Pd, Pt, Rb, Rh, Sb, Se, Si, Sn, Sr, Th, Tl, U, V, Y, Zn, Zr. The surveys followed the British Geological Survey's Geochemical Baseline Survey of the Environment (G-BASE) standard developed over many years that defines the specifications for mapping the regional geochemistry of the United Kingdom. For further information visit the Tellus webpages: http://www.bgs.ac.uk/gsni/tellus/