You'd probably want to check an access log but add on a grep to specify those bits. If you can identify what is causing this, you might feel more comfortable with either killing the processes or leaving them alone. On my machine, if the processes were still running, it would be like this:
You might want to check your semaphores if they fill up.
Or if your logs in /usr/local/apache/logs
If any file is over 2 Gigs
PsychzNetworks - Enterprise Servers & Data Center Professionals
★24/7 On-Site Support - Premium Server Hardware
★Facilities: Los Angeles, CA - Dallas, TX | Tier-4 Data Centers
★Dedicated Servers - Colocation - Psychz DDoS-Shield™ On-Premise Mitigation