Rob Valceschini needed to buy a new suit this month.After all, when you're standing in the spotlight with top-ranking political and trade figures from the United States and China, you can't show up in the jeans and boots that are common around the modest offices of Applied Soil Water Technologies LLC.But while the company's presence in a nondescript industrial building in a strip building on East Glendale Avenue is anything but flashy, the company's big dreams got a big boost last week with the formal signing of a deal with a Chinese company to begin building facilities that convert municipal …