Thursday Mar 06 2008 comments Old mine vent filled with foam. By: Ben Furtado -A +A Jon Mistchenko of the California Department of Conservation. After the foam is poured it continues to expand filling the mine vent. Filling the mine vent is a long process of pouring, settling, drying and pouring again. The pouring of the foam in to the mine vent. Jon Mistchenko, left, and Sam Hayashi, right, prepare to mix the foam. Jon Mistchenko of the California Department of Conservation mixes the two part foam liquid before pouring it into the mine vent. Members of the Department of Conservation view the mine vent. Members of the Department of Conservation use hard foam to help support the liquid foam which will be poured in. Jon Mistchenko of the California Department of Conservation helps lower a foam base into the mine vent. One of Dewies favorite things to do on the trail in play in the near by water canal. Dewie runs to the mine vent site as media and his owners follow. Dewiw checks out the mine vent of which he fell in back in January. Owners of Dewie, Marc and Erica Roper. Dewies owners Marc and Erica Roper. Golden retriever Dewie is all smiles after being rescued from a mine vent back on January 21.