The short answer is, Don't worry about disposing of the debris from cutting that little bit of material.
OSHA doesn't care how you dispose of the lead, EPA does, and some states and municipalities do. OSHA is concerned with whether or not any employees get lead poisoning, which isn't the question you've asked.
"Abatement" is a legal term for removing lead in order to comply with the EPA standards regarding lead in "target housing" (residences where a child under 6 resides), or in "child-occupied facilities" such as commercial properties which contain day-care centers. If it's not target housing or a child-occupied facility, then removing the lead is lead "removal," not "abatement." That's important, because lead "abatement" is strictly regulated by EPA.
Either way, if you chuck lead into a dumpster, the dumpster should undergo a Toxic Characteristic Leaching Procedure (TCLP). But one of the 8 ways to do the TCLP is by calculating the worst-case: How much lead could possibly be on the paint on the filings you're tossing into the dumpster, compared to the weight of the entire contents of the dumpster (which we assume contains no other lead-bearing material). Run those numbers on a calulator, and you'll find that the load will pass the TCLP, so the load's not hazardous.