4. Routine maintenance, inspection and operational testing of the emergency generator and associated. components must be overseen by a properly trained person [see MSFC(07), Sec. 604.5; NFPA. 99(99), Sec. 3-4.4.1.1(b)3; NFPA 110(99), Sec. 6-4.7; NFPA 110(02), Sec. 8.4.7].
If rain and wet roads are a concern, you should consider replacing your tires when they reach approximately 4/32 of remaining tread depth. Since water can't be compressed, you need enough tread depth to allow it to escape through the tire's grooves.f two of your tires have a lot of remaining tread depth, but you need to replace the other two because they were damaged or have worn out, you should replace them with a pair of tires that come as close as possible to matching your existing tires.
Go to tirerack.com and do some research. After you enter some details and find the tires, pick a few and read the reviews. After that go to survey results and you will find color coded informations. I expect my wife's 2006 Sienna (25k) will need new tires at 30k. I've done some research at Tire Rack and am leaning toward the Yokohama Avid TRZ or a Dunlop SP60. The OEM tires weren't bad, but wore out too quickly for my liking. I wouldn't put too much credence in what Pep Boys says about tires since that is what they're trying to sell.