cornell b corne cornell bernard joins us live to explain. >> reporter: the city's taking this threat very seriously tonight. that roadblock up at cross creek road, not far from where we are tonight. the city discovered a few hours ago that a drainpipe running underneath the road was compromised. it was destroyed by the firestorm. that road is now shut down, and it's not the only place melted pipes are found around santa rosa tonight. this sinkhole was just discovered in the fountaingrove neighborhood. ittow it opened up after hundreds of feet of plastic pipe melted in the firestorm. >> the pipes caught fire and in some cases were destroyed. >> reporter: they're replacing new pipe, but melted pipe has been found all over fountain grove. >> so far we've identified eight sites where the pipe has been lost, and 20 additional suspect areas that are under investigation today. >> reporter: we found city crews inspecting areas with tiny cameras, looking for damage. it's creating a danger of runoff and flooding, prompting this warning. >> we're asking residents, especially in the fountaingrov

cornell b corne cornell bernard joins us live to explain. >> reporter: the city's taking this threat very seriously tonight. that roadblock up at cross creek road, not far from where we are tonight. the city discovered a few hours ago that a drainpipe running underneath the road was compromised. it was destroyed by the firestorm. that road is now shut down, and it's not the only place melted pipes are found around santa rosa tonight. this sinkhole was just discovered in the fountaingrove neighborhood. ittow it opened up after hundreds of feet of plastic pipe melted in the firestorm. >> the pipes caught fire and in some cases were destroyed. >> reporter: they're replacing new pipe, but melted pipe has been found all over fountain grove. >> so far we've identified eight sites where the pipe has been lost, and 20 additional suspect areas that are under investigation today. >> reporter: we found city crews inspecting areas with tiny cameras, looking for damage. it's creating a danger of runoff and flooding, prompting this warning. >> we're asking residents, especially in the fountaingrov