INORGANIC ARSENIC IN THE METAVOLCANIC BEDROCK OF WEST GEORGIA
As part of undergraduate research in groundwater environmental geochemistry at the University of West Georgia, wells were sampled and tested for arsenic in Carroll County, Georgia. We tested 64 private wells and 15 shallow campus research wells. The campus research wells are shallow bored wells in the floodplain of the Little Tallapoosa River. The campus research wells had detectable arsenic. These wells are all in an area of amphibole and hornblende which is known to leach arsenic. Over 50 domestic wells in Georgia were sampled and tested for arsenic levels using a non-compliant EPA method. Using a portable test strip they were screened for arsenic. The color test strip has 0 ppb, 10, 30, 50, 100, 300, and 500 ppb reading levels. All samples over 10 ppb will be resampled and retested and will be sent to an outside lab for testing by an EPA approved method. This research focuses on the relationship between arsenic in well water and the type of bedrock. GPS positions were plotted on a new geologic map of Carroll County. Results indicate that the highest readings of 30-50 and 50-70 ppb of arsenic were all in the meta-volcanic rock type. Only 16% of the samples that contain <10 ppb arsenic are in meta-volcanic bedrock. Additional well water sampling will be done in other rock units.