This paper describes the steps and results that were taken to lower radionuclide levels in a single
1-mgd well that feeds a localized area in Pasco County, Florida. Pasco County, located on the
Gulf Coast of Florida north of the Tampa Bay Metropolitan Area, provides water to nearly
250,000 residents through a county-wide conveyance and distribution system. The County's
water supply comes from groundwater pumped through 29 dispersed wells throughout the
County and three interconnects with a local wholesaler. As part of monitoring for radionuclides,
Pasco County discovered levels of gross alpha and combined radium 226/228 that exceeded
regulated limits in one of their wells, LB Well No. 2. Once discovered, the County immediately
shut-down the well until corrective measures could be identified and implemented. Two
corrective measures were considered: re-construction of the existing well to possibly limit or
eliminate contributing zones in the aquifer; and, treatment. A hydrogeologist and driller were
contracted to perform logging of the well to identify aquifer zones that could potentially be
isolated. For treatment, single use ion exchange, conventional ion exchange, pre-formed hydrous
manganese oxide filtration and reverse osmosis were considered. Four different equipment
vendors specializing in the treatment of radionuclides were contacted and requested to prepare
and submit an equipment cost estimate. Eight different estimates were received and evaluated.
These were used as the basis for preparing a conceptual level design and cost estimate for
capital, operations and maintenance costs for each. Includes 4 references, tables.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 350 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 16 |
| Published : | 06/01/2006 |
