First, this report looks like it was probably generated from a CAD terminal of a police or 9-1-1 dispatcher. Such a system is used to record various data about emergency calls for service but it is only as good as the data input into it.
For example, on page 1 in the top left there are times for various status (Connection, Dispatched, Enrouted, Arrived, Cleared) states of the responding officer(s). Those times are only as good as the person who was punching buttons into the computer. The act of dispatching the officer by radio does not automatically make an entry into CAD.
So, as the the OP’s question, page 46 of the link provided shows Officer Timothy Smith and Officer Ricardo Ayala were assigned to respond to the incident.
There are three entries noted at 02-26-2012 19:17:11.
They were all entered from a different computer terminal (Term ID 4027) than the terminal used to set up the report (Term ID TM21). That is not unusual. It is likely that those entries were made from a computer terminal mounted in the police cruiser.
It is not likely that these notations are the proper marking of the arrival time of Officer Timothy Smith at the scene. There is usually a single button on the CAD terminal to click to mark an officer’s arrival on scene and arrival time of the first responding officer would also be reflected in the top left corner of that page.
If, however, the dispatcher had not clicked the button to properly mark the arrival of the officer a notation in the notes might reflect arrival in the manner noted. I would call it sloppy, but not unheard of.
Most interesting thing I note about page 46 is the top right of the page where the curret status is noted as DELETED. This may be because the report was considered a duplicate (when more than one call is received about an event it is common to combine all information into one report and cancel or delete any duplicates).
I am not sure what ARV means in this context if it is not referring to arrival of the unit. But… in British style policing we use the ARV abbreviated for Armed Response Vehicle - a police unit that carries weapons. Most of our officers are unarmed. But since most US officers are armed I am not sure this abbreviation would have the same significance.