The following regulations apply in the M-1 and M-2 Industrial Districts:
A. The release of airborne toxic matter (including radioactive matter) shall not exceed one-thirtieth (1/30) of the maximum permissible concentration allowed an industrial worker when measured at any point beyond the lot line, either at ground level or habitable elevation, whichever is more restrictive. Concentrations shall be measured and calculated as the highest average that will occur over a continuous twenty four-hour period.
B. If a toxic substance is not contained in the most recent listing of threshold limit values published by the American Conference of Governmental Industrial Hygienists, the applicant shall satisfy the local County Health Department that the proposed levels will be safe to the general population. (Ord., 5-7-1973)