The 30th Annual Pumper & Cleaner Environmental Expo struck an optimistic note for the environmental service industry. Attendance reached 8,784 persons representing 3,921 companies, up 3.7 percent over 2009. Exhibitors almost universally reported interested buyers and strong sales.A cruise around the exhibit floor also showed continuing innovation in products and technologies that help contractors save labor, serve customers better, and boost profits. Here is a look at some of the innovations on display.Hydroexcavating truckThe RamVac HX12 hydroexcavator from Sewer Equipment Company of America can dig safely and also bulk-load material. It has a 5,500-cfm/27-inch-Hg positive displacement blower that can be
