AWWA WQTC65725

The City of Kennewick, Washington owns and operates a 12 million gallon per day (MGD) collector well. Collector well #5 (RC5), is located in close proximity to the Columbia River and Columbia Pond, one of the river's small tributaries. In 2004, the Washington Department of Health (WDOH) determined the collector well to be a "groundwater under the direct influence of surface water" (GWUDISW). This determination was based primarily upon using the relative risk tables in the U.S. Environmental Protection Agency (USEPA) Microscopic Particulate Analysis (MPA) Consensus Method (USEPA, 1992). In lieu of constructing engineered filtration to comply with the Surface Water Treatment Rule the utility opted to apply for alternative filtration technology (AFT) credit for Riverbank Filtration as provided under the States regulations. In order to obtain the credit, the Washington Department of Health required the City to perform a one-year demonstration study. Includes 2 references, table.