However, a manifest provides you with added protection. Vendors may also help you with other paperwork, including the Department of Ecology's annual generator report. Ask vendors what they charge for each of the above items. Ask which charges are one-time and which are ongoing. Find out if there are any other fees you must pay.
Most vendors charge more if hazardous liquids contain chlorinated solvents.
Small amounts of these solvents can contaminate an entire drum or tank of other types of waste. To avoid contamination, know your chemicals. The more water, the higher the cost for disposal. While the presence of metals may not affect disposal costs, additional lab testing may be required. Ask your vendor.