Sorry to dig this up from the past, however, I have new info.
Found out that this was indeed a pirate. Our bain, Nelson GOmez was running this station with a lot of power and a directional antenna from the top of Fowler Peak, near Angels Camp. Also, he was running another on 106.7 from this same location. Yes, Nelson has a license for a translator in Arnold on 106.7, but this was NOT it!
Talked to an engineer in the market about this recently who had previously been very tight-lipped about it. Got it from the horse's mouth, so to speak. He showed me pictures and audio. Wow, how blatant is THAT??!!
Nelson GOmez was already famous for moving and boosting power of KBYN and KCFA with illegal directional antennas pointed at Stockton and Sacramento, respectively. Saw pictures of those too. Wow.