The Orange County Water District (OCWD) manages a roughly 300 square mile groundwater basin in Southern California. The basin, an assemblage of fine and course grained unconsolidated sediments, lies adjacent to the Pacific Ocean. In response to sea water intrusion into the drinking water aquifers, the OCWD constructed an alignment of injections wells to provide a hydraulic barrier to sea water intrusion. The wells inject a blend of import and treated waste water. To maintain optimum efficiency through the injection well alignment, the OCWD engages in an extensive well redevelopment program. Through the years, many different mechanical and chemical treatments have been employed. This presentation will discuss the various redevelopment techniques used and examine the effectiveness of the various techniques. The Orange County Water District (OCWD) manages a roughly 300 square mile groundwater basin in Southern California. The basin, an assemblage of fine and course grained unconsolidated sediments, lies adjacent to the Pacific Ocean. In response to sea water intrusion into the drinking water aquifers, the OCWD constructed an alignment of injections wells to provide a hydraulic barrier to sea water intrusion. The wells inject a blend of import and treated waste water. To maintain optimum efficiency through the injection well alignment, the OCWD engages in an extensive well redevelopment program. Through the years, many different mechanical and chemical treatments have been employed. This presentation will discuss the various redevelopment techniques used and examine the effectiveness of the various techniques.
