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11 explained that the "A" brand is large, is totally ignited and then set on the material. It burns at 2000 degrees. A "B" brand test is half of the mass and burns at 1900 degrees. And the "C" brand is roughly half of the B brand, and burns at 1500 degrees. In order for materials to pass the test, they must not ignite and burn through within a 90 minute period. Each test is fanned by a 20 mile per hour wind. Ms. Mohr askedMr. Nichol if a fire like the Oakland fire were to happen on the Pleasanton Ridge, would these brands be carried down to Pleasanton. Mr. Nichol replied that he did not believe the wind could carry an "A" brand. The "B" brands could be carried for a short distance and the "C" brand could be carried over an area more than a quarter of a mile. Chief Withers stated that the duration of exposure should be the focus. Ms. Scribner asked Chief Withers where the hazard areas were in Pleasanton. Mr. Withers responded' that the Ridgelands to the west and the hill areas to the south and east. Ms. Scribner stated that products that can cause fire to spread should not be used in those high hazard areas. Chief Withers stated that the concern of Mr. Howell about the proposal being an emotional reaction to the Oakland fire is unfair. For years, fire chiefs have been trying on the state level to ban wooden roof materials, but politics have prevented that. The only way to prove there is a problem is to have a major fire and that is what we are trying to avoid. If a treated wood shake roof lasts for seven to ten years and then after that period it is sprayed with a fire retardant, you would still have a wood that degrades. It would still burn at some point and then it would throw off flying debris as any other wood products do ....... Ms. Scribner asked what he rates composition shingles. Chief Withers replied that shingles would burn, but that they.do not have the same burning brand problem. He added that to the best of his knowledge, most of the fires they are called on have wood shingled roofs. The main concern isthe exposure to neighboring houses once a fire breaks out. Chief Withers stated that there are a number of new materials available that are very decorative. When the City staff proposed the ordinance in 1986, there was treated shake available and now there is a class B shake available which has a better treatment and better wood. The proposed Ordinance gives the community a reasonable selection of materials. The cost is minimal; it will cost only $50 a year over the life of a roof (20-25 years). 1/7/92 11