STAFF PHOTO ANTHONY REYES Nathan Walden, left, and Willy Alexander, both with the Huntsville Water Utilities, use an industrial vacuum truck to clean up human waste Monday along Klenc Road south of U.S. 412 in Tontitown. A truck from Jimmy Jones trucking in Berryville spilled the waste from the city of Huntsville while transporting it to the landfill. The cause of the spill is under investigation by the Arkansas Highway Police.