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Licensed for the sole use of the purchaser.See license agreement penalties for distribution. CGA G-1.8-2017 COMPRESSED GAS ASSOcIATION INC. PAGE 1 1 Introduction This guideline has been written in response to the demand for information relating to the proper operation and closure of carbide lime ponds. 2 Scope and purpose This guideline is intended for use by owners and operators of carbide lime ponds and others providing services to these entities. Its purpose is to provide guidance on how to responsibly operate and close carbide lime ponds associated with the manufacture of acetylene gas from calcium carbide. 3 Definitions For the purpose of this publication, the following definitions apply. 3.1 Publication terminology 3.1.1 Shall Indicates that the procedure is mandatory. It is used wherever the criterion for conformance to specific recom- mendations allows no deviation. 3.1.2 Should Indicates that a procedure is recommended. 3.1.3 May Indicates that the procedure is optional. 3.1.4 Will Is used only to indicate the future, not a degree of requirement. 3.1.5 Can Indicates a possibility or ability. 3.2 Technical definitions 3.2.1 Calcium carbide Nonflammable chemical compound of calcium and carbon that reacts with water to produce acetylene gas and carbide lime. 3.2.2 Carbide lime Calcium hydroxide (calcium hydrate) derived from the reaction of calcium carbide and water. NOTE--Lime refers to carbide lime unless otherwise specified, 3.2.3 Co-product Material such as lime slurry that is a product of a process produced for the general public's use and is ordinarily used in the farm it is produced by the process. NOTE—See Title 40 of the U.S. Code of Federal Regulations(4C Cl Part 261.1(c)[1 3.2.4 Hazardous waste Solid waste as defined in 40 Cl 261 [1]. NOTl 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[1]. References are shown by bracketed numbers and are listed in order of appearance in the references section. 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 modifica€ion 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.