Many well fields in sand and gravel aquifers are likely to be
hydraulically influenced by surface water; however, their
risk for Giardia and Cryptosporidium contamination may be
low because of natural filtration (i.e., riverbank filtration [RBF]).
This study was undertaken to evaluate the true risk for pathogenic
protozoa in a well field being recharged by a local river.
The authors assert that RBF should be considered as a treatment
process, with the proper amount of assigned treatment
credit. It is one of many treatment tools in the microbial toolbox
in the proposed Long Term 2 Enhanced Surface Water Treatment
Rule, but it should be given more than the 1.0 log credit if
warranted (demonstrated) at a particular well field. It is hoped
this information will help utility managers obtain the proper
amount of treatment credit for RBF, especially if their groundwater
source is designated as being "under the direct influence
of surface water." Includes 20 references, tables, figures.
| Edition : | Vol. 95 - No. 12 |
| File Size : | 1
file
, 1.7 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 11 |
| Published : | 12/01/2003 |
