Hello!
Unfortunately, it is not possible to track the volume that had been matched in the market at a certain time (e.g. 30 sec.) before a goal was scored, but it is possible to alert you if that amount was matched right before the goal was scored.
Please see the corresponding triggers attached. The trigger "alert on matched volume" plays a sound and shows an alert window when the conditions are met, but you can also add other types of alert actions to that trigger, such as "write to log file", "write to file" or "email".