3.1.1.2. Own survey of arsenic and other species in Cambodia groundwater. Between April and December 2004, Eawag and RDI conducted an in-depth groundwater survey covering the Kandal province and bordering areas. This province is largely situated on the floodplain between the Bassac and Mekong Rivers stretching from Phnom Penh to the Vietnam border in the south (seeFig. 2). For this study, a set of more than 200 samples was randomly collected from household tube-wells at a sampling density of approximately 1 sample per10 km2. Arsenic concentrations ranged from 1–1610 μg/L (average 217 μg/L, n= 207). Arsenic levels are particularly high in the Kandal province (average 250 μg/L, n= 175), while provinces bordering Kandal to the east and west are much less affected (average 12 μg/L, n= 32). The 14 parameters analysed (see Table 1) indic
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