I would like to ask for visa China upon arrival, is it ok?

It is possible for him to get a 5 days Xiamen Special Economic Zone tourist visa, but the visa only permits him to visit within Xiamen Island and Gulangyu Island. If you want to visit other cities besides Xiamen, you need to apply for a China visa annotation at the checkpoint or exit-entry administrative department of Xiamen public security bureau.

There is no Chinese consulate office in Seattle. There are China embassy in Washington, consulate in New York, Chicago, Houston, Los Angeles, San Francisco.