You can check the street cleaning schedule here. The schedule will shift it it falls on a holiday, but that doesn't seem to be the case here. According to the signs, you were parked in District C. According to when you were towed (12/8), the car was parked on the odd side of district C. Were you anywhere near River St, which divides C and E? There simply is no way it could be an overzealous tow truck driver hoping for an extra buck. (/s)