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USE OF WETLAND PONDS AND GROUNDWATER RECHARGE BASINS AS OUTFALL FOR PRODUCED RECLAIMED WATER
Author: Matt Gough
Date: 9/104
WateReuse Conference 2004

The LOTT (Cities of Lacey, Olympia and Tumwater, and Thurston County) Wastewater Alliance has begun to implement a wastewater management program designed to use regional satellite reclamation plants to treat raw wastewater to State of Washington Class A reclaimed water standards suitable for irrigation and industrial uses. The Class A reclaimed water shall be conveyed from the satellite reclamation plant to a 40-acre wetland ponds/recharge basins facility for final polishing and infiltration into the aquifer. Prior to groundwater recharge, the Class A reclaimed water will flow through five distinct wetland ponds covering approximately 11-acres. The wetland ponds serve several key functions prior to recharge, including: Disassociate the reclaimed water from the source. Public amenity for the community. Attenuate peak flows to the recharge basins. Temporary storage and isolation of reclaimed water during satellite reclamation plant upsets. Opportunistic supplemental treatment for nutrient removal. Eight acres of groundwater recharge basins are incorporated with the wetland ponds and allow LOTT to fully recycle Class A reclaimed water generated at the satellite reclamation plant throughout the entire calendar year. It is anticipated the recharge basins will be most fully used during the winter months, when direct irrigation by users will be at a minimum. The recharge basins provide a path for the reclaimed water to reach the aquifer in a managed and efficient manner. Through groundwater recharge, the reclaimed water becomes a renewable resource available to the entire community. Infiltration into the groundwater can help reduce or stop the decline in groundwater levels during summer, provide storage for later use, and provide increased flow to surrounding streams during dry periods, protecting stream habitat.