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City of Tracy INWTP <br />Incident Investigation <br />Events and Actions as Incident Unfolded <br />Strong winds blew over a ladder that was leaning against the ammonia storage tank onto the <br />PVC piping connecting the tank to the equipment monitoring building at approximately <br />6:30pm. The impact of the ladder on the pipe caused the pipe to break and the tank to <br />drain liquid onto the ground and flow over asphalt pavement and aggregate base to the <br />storm drain; the runoff drained to the on-site retention pond. The damaged piping <br />was discovered at approximately 9:30pm by on-site operations staff David Rathbun and <br />reported to his supervisor, wastewater treatment plant superintendent, Aloke Vaid.