Section Env-A 2404.04 - Visible Emission Standards for Non-Ferrous Foundries, Smelters, or Investment Casting Operations(a) Unless otherwise specified in this chapter, no person shall cause or allow visible fugitive emissions or visible stack emissions for any non-ferrous foundry, smelter, or investment casting to exceed an average of 20 percent opacity for any continuous 6-minute period.(b) Opacity shall be determined in accordance with Env-A 807.N.H. Code Admin. R. Env-A 2404.04
#10315, eff 4-23-13 (from Env-A 2405.03)