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Licensed for the sole use of the purchaser.See license agreement penalties for distribution. PAGE 2 COMPRESSED GAS ASSOCIATION INC. CGA G-1.8--2017 3.2.6 Hazardous waste under the characteristic of corrosivity Solid waste that is aqueous and has a pH less than or equal to 2 or greater than or equal to 12.5 as determined by using Methods 9040B or 9045C in Test Methods for Evaluating Solid Waste: Physical/Chemical Methods, U.S. Environmental Protection Agency (EPA) SW-846 [3]. NOTE—In Canada,waste management is governed by provincial as well as federal regulations under the Canadian Environ- mental Protection Act[2]. Operators of lime ponds should reference the environmental regulations of the province where the lime pond is operated for specific definitions. 3.2,6 Lime paste Carbide lime and water mixtures typically containing greater than 45% solids. 3.2.7 Lime pond Natural or manmade structure generally formed by earthen materials used to store and contain carbide lime before sale. 3.2.8 Lime pond closure Overall process to responsibly decommission a lime pond with any necessary approvals from applicable regula- tory agencies. 3.2.9 Lime slurry Carbide lime and water mixtures typically containing 10%to 45% solids. 3.2.10 National/state pollution discharge elimination system (NPDESiSPDES) permit Authorization, license, or equivalent control document issued by the U.S. EPA or a state environmental agency to implement the requirements associated with point-source wastewater or storm water discharges. 3.2,11 pH Hydrogen ion activity of a solution expressed as the logarithm of the reciprocal of the hydrogen ion concentration in moles per lifer at 25 °C (77 °F). NOTE—The practical pH scale extends from 0(very acidic)to 14(very alkaline)with 7 corresponding to exact neutrality. 3.2.12 Pozzolanic effect Reaction between siliceous or alumino-siliceous material (sails, sand, etc.) and alkaline hydroxides (such as lime) in the presence of moisture to form compounds having cement-like properties. 3.2.13 Publicly owned treatment works (POTW) System managed by a public agency to collect and treat sanitary and approved industrial wastewaters. 3.2.14 Solid waste Any discarded, disposed of, burned, or incinerated material that is not excluded by 40 CFR 261.4(a) or that is not excluded by variance granted under 40 CFR 260.30 and 260.31 [1]. NOTE--An Canada,waste management is governed by provincial as well as federal regulations under the Canadian Environ- mental Protection Act[2]. Operators of lime ponds should reference the environmental regulations of the province where the lime pond is operated for specific definitions, 4 Carbide lime technical issues 4.1 Chemical/physical properties of carbide lime Carbide lime is a co-product generated through a reaction of calcium carbide and water during the acetylene manufacturing process. It is also referred to as lime slurry, Ifine hydrate, carbide slurry, and generator slurry. The chemical equation for this reaction is; CaC2 +2H20_�C2112 +Ca(OH)2+Heat A large amount of excess water is used in the wet process to produce calcium hydroxide in slurry form with 10% to 15% solids. This document licensed for the sole use of the purchaser. It may not be shared with any other person or used after the expiration date without the express written permission of the CGA. Any unauthorized use, reproduction, distribution, or modification of this printed page will result in a$5,000 liquidated damages fee plus loss of access to CGA publications for one year for your company.