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During late 1971 and early 1972, 3 injection and withdrawal tests were made at the Norfolk, Va., injection site. The specific capacity decreased from 3.7 to 0.93 gal min-1ft-1. Attempts at redevelopment of the injection well failed to improve the specific capacity. Current-meter surveys made during injection and withdrawal pumping indicate that the reduction in flow and specific capacity were due to a uniform reduction in the hydraulic conductivity of all contributing zones in the aquifer and not to a complete shutoff of flow from selected parts of the aquifer. The hydraulic and chemical data indicate that the uniform loss of specific capacity of the contributing zones was due to dispersion of interstitial clay and that this clay would readily respond to chemical treatment for the purposes of decreasing or liminating dispersion. Treatment of the injection well with a clay stabilizer prior to the injection of any fresh water will minimize clogging and increase recovery of fresh water. If plugging of the screen can be prevented so that injection and withdrawal flow patterns remain similar, the storage of fresh water in a brackish-water sand aquifer is feasible. (16 refs.)

Artificial recharge to a freshwater-sensitive brackish-water sand aquifer, Norfolk, Virginia