Users who commence discharge after August 23, 1990, shall provide the notification no later than 180 days after the discharge of the listed or characteristic hazardous waste. Any notification under this subtitle needs to be submitted only once for each hazardous waste discharged. However, notification of changed discharges must be submitted in accordance with 40 CFR 403.12(j). City Code, 1976/83, art. 25, §7(c)(3), (4) Ord. 91-775