It looks like El Paso has a Municipal Code with chapters and sections. It amends the Code by passing numbered ordinances. So 00339 likely refers to the ordinance which amended the Municipal Code regarding Stop signs (and likely other traffic sections). Based on recent ordinance numbers amending the Code, 00339 is likely very old (current numbers are in the 018xx range). The section of the code relevant here is 12.60 and the sections within it. Section 12.60.050 addresses stopping for a Stop sign and is followed by Section 12.60.070 which says -
No driver shall enter an intersection or a marked crosswalk unless there is sufficient space on the other side of the intersection or crosswalk to accommodate the vehicle he is operating without obstructing the passage of other vehicles or pedestrians, notwithstanding any traffic-control signal indication to proceed.
Even though you stopped, the accident is prima facie evidence that there was not sufficient space to enter the intersection without obstructing the passage of other vehicles.

