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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 III Contents Page 1 Introduction...................................................................................... 1 ..................................................... 2 Scope and purpose...................................................................................................... 1 3 Definitions....................................................................................................... 1 .......................... 4 Carbide lime technical issues.................................................................... 2 .......................................... 4.1 Chemical/physical properties of carbide lime....................... ........... .. 2.............................................. 4.2 Lime uses........................................................................................ ........................... 3 5 Regulatory issues for carbide lime........................:............................................................... 5.1 Carbide lime—a.co-product.................................................................. 5.2 Carbide lime ponds.................................................................. .4 ...................................................... 5.3 Canadian regulations ....................................................... 6 Potential environmental issues......................................... 4 ...........:............................................................... 6.1 Soil.......................................................................................................................................................4 6.2 Groundwater.............................................................................. 4 6.3 Surface water.................................................................................................. 4 6.4 Air.............................................................................................. 7 Lime pond operation and maintenance............................................................ 5 .................... . 7.1 Security and posting............................................................... .....................5 7.2 Safe handling.......................................................................................................................................5 7.3 Lime pond integrity.............................................................. .5 7,4 Removal of lime slurry or lime paste................................................ 6 8 Lime pond closure procedures.................................................. 7 8.1 Phase I—Site characterization and regulatory review............................................. ... ...............7 8.2 Phase II—Development of a site-specific closure work plan................... ..........g ................................. 8.3 Phase III—Work plan implementation.......................................................... ................. ....10 .............. 8.4 Phase IV---Postclosure ...................................................... 11 9 References............................................................................................. Appendices Appendix A--Phase I checklist—facility and lime impoundment characteristics (Informative)...........................12 Appendix B—Phase I checklist—regulatory requirements(Informative)..................... ...............14 This document fcensed 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.