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(3) CWC Code#172 - Laser Dust(Steel) <br /> a) Estimate of the weight, in pounds,of waste generated at the site per year: <br /> i. 1,625 pounds per year is estimated. <br /> b) CWC Code - #172. <br /> i. (1) processes, operations, and activities generating the waste, with <br /> corresponding block diagram: See Appendix C. <br /> In the process of malting metal building components, Star Buildings cuts <br /> lengths of steel to different specifications based on the building model <br /> being produced. The process of cutting involves the use of a Trumpf 4000 <br /> Watt Laser System. The laser system process is the result of concentrating <br /> a high energy beam of light on the surface of the steel plate.Nitrogen and <br /> oxygen gas assist in the cutting process which ionizes the steel . The laser <br /> cutting process complies with SJVUAPC District Rules 1070, 2201, and <br /> 4102. <br /> Star Buildings' laser sheet cutting process generates hazardous waste, <br /> called metal dust in only one way. Sheet steel is conveyed onto the slat <br /> cutting table where the cutting takes place. A Torit brand Downflo Dust <br /> Collector, fixed in place, exhausts smoke and debris from the Trumpf laser <br /> cutting process. The Torit unit Model #DFT-3-6 is equipped with six <br /> paper pleated filters with a combined surface area of 912 square feet. An <br /> air assist is provided to improve the exhaust efficiency. The manufacturers <br /> rating of filter efficiency is .005.The Dust Collectors are in compliance <br /> with SJVUAPC District Rules 2070, 2201, 4101, and 4102. <br /> Smoke and dust collected during the cutting process is collected in a bin <br /> inside the unit and dumped periodically into 55 gallon DOT approved <br /> fiber drums for storage and pickup. The current waste generated cannot be <br /> resold or recycled and therefore has to be disposed of as hazardous waste. <br /> A certified analytical report shows that there are trace amounts of copper, <br /> lead, and zinc, measured in micrograms per liter. The waste is transported <br /> in 55 gallon DOT approved fiber drums for storage and pickup. This waste <br /> is stored for 90 days, or less, and then transported by North State <br /> Environmental on a periodic basis to Chemical Waste Management, 35251 <br /> Old Skyline Road, Kettleman City, CA 93239, a licensed hazardous waste <br /> management company. Waste generated by this method has been <br /> monitored since installation. In 2002,we have disposed of 1,625 pounds <br /> of hazardous metal dust-waste from the plasma cutting process. <br /> (4) CWC Code#352—Paint Pigment/Paint Solids <br /> (a) Estimate of the weight, in pounds, of waste generated at the site per year: <br /> 33,120 lbs. Pounds per year. <br /> (b) CWC Code: #331 <br /> 6 <br />