Under Local Law #1 of 2004, what is the definition of “lead contaminated dust”?

Local Law #1 of 2004, sets forth a definition of the meaning of lead contaminated dust. The law states that “lead contaminated dust” means dust containing lead at a mass per area concentration of 40 or more micrograms per square foot on a floor, 250 or more micrograms per square foot on a window sill, and 400 or more micrograms per square foot on window wells or such more stringent standards as may be adopted by the department of health and mental hygiene. The samples must be taken by a properly trained person who will utilize proper protocol in accurately testing the location.