for chris ostrom the dumping insults the environment. hundreds of tires have appeared in the last month in multiple areas. >> the russian river water shed is our main source for drinking, wildlife corridor. >> the mystery of course is who dumped these tires, where did they come from. there may actually be clues. these stickers. >> every time has a serial number tied to a warranty and is in someone's computer. it seems really easy to find out what shop they came from. >> reporter: the mendocino sheriff's office continues to investigate, it has been difficult for chris to stand idly by, especially when cleaning up messes is part of his dna. he and his green team have hauled some 200 tires from another location. but with so many more. >> every time, you know, one of these shredded up tires wanders down river, kids, people, fish, you know, they're going to cut themselves. steel belts are very sharp. >> so true, just downstream, miguel elliot avoided a couple of tires this afternoon. >> thoughtless, careless, disrespectful. >> and for the nea