When I was in the water tank industry, we were guaranteed an OSHA visit if lead abatement was involved. I quickly learned, before the job started, to schedule a "voluntary" inspection (VPP). Once that inspection was scheduled, the surprise inspectors could not visit (unless imminent danger) your site. Also, you can usually postpone the voluntary inspection once or twice. The voluntary inspection is usually pretty painless. They walk the site and make a few comments. This is followed by a full report that they provide within a certain period of time (30 day or something...I don't remember). You then have a period of time to address the issues in the report (another 30 days maybe?). OSHA then schedules a re-inspection where you had better fixed the issues in the report. Of course, we were ALWAYS done with the job and off the site well before the final inspection was scheduled.

It took a while for me to convince our Superintendents that we needed to voluntarily ask OSHA to inspect the site, but it was ultimately the best course of action. Had they made unannounced inspections, they would find stuff and it would cost more time and money.