the upkeep on duratherm -- it is embedded in asphalt. essentially, you have to route out four inches of asphalt, and then they embed the duratherm in the asphalt. this is similar to something they do in london. supervisor mar: i think they do this in hong kong, too. >> it has been well appreciated in the neighborhoods. we put cameras underneath the intersection to make sure all the pipes are working correctly, but if i had to do it over again, i do not know if i would put them in such a large intersection because you are vulnerable when you tear it up, it gets expensive. it is very nice, an improvement, but any time you have to replace something under the street, it is costly. i would only do it in special places. open sidewalks. there was money available for rainwater. the mission gets flooded a lot, so we started opening up sidewalks. we also wanted to get to the news stands. we got those new news racks, and we purposely put them up against the building's. that frees up the sidewalk, so that you can open it and put in plantings and mak