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Licensed for the sole use of the purchaser. See license agreement penalties for distribution. PAGE 6 COMPRESSED GAS ASSOCIATION INC. CGA G-1.8-2017 7.3.2 Refuse in ponds Every attempt should be made to prevent waste materials from being disposed/discharged into or around lime ponds or lime processing areas. Under no circumstances should any hazardous waste be mixed in or disposed of in a lime pond. This can cause the lime to be considered a hazardous waste. Contamination of lime material can result in loss of marketable lime product and increased expenses when closing the lime pond. 7.4 Removal of lithe slurry or lime paste Removal methods and procedures used by owners and/or operators of carbide lime ponds vary depending upon the end use for the lime. Most carbide lime is used as a product (as described in 4.2). Therefore, pay attention to the lime co-product user's application and quality requirements. The user's application and desired form and quality often determines the most appropriate removal and handling methods. 7.4.1 Removal as lime paste Lime settles out at the bottom of a pond, separating from standing water, and approaches a paste consistency overtime.Carbide lime is removed from a pond as paste in instances when customers can handle larger volumes of lime and/or have facilities to add water to the paste to create lime slurry for use in their applications. Lime paste can be removed from a pond using standard excavation/construction equipment, Equipment typically used for removal of lime paste from a pond includes the following: • Hydraulic excavator (backhoeltrackhoe)—This equipment is readily available and requires a minimal oper- ating area and minimal mobilization/demobilization time. It is good for situations where multiple handling of the lime is required. NOTE—Lime pond configuration can require extended-boom equipment. • Crane with dragline—The dragline is effective for lime removal and direct loading of balk transport vehicles; or NOTE—This equipment requires a larger operating area and a more stable working base than a lighter piece of equipment such as a backhoeltrackhoe. • Front-end loader—If the lime is dry enough, this equipment can be used to excavate paste from the pond and to load transport vehicles.This equipment is readily available and is more versatile than a backhoe/track- hoe or dragline. A loader is particularly useful for decking out lime paste in a staging area for further water drainage before transport. One of the most important aspects of lime paste removal is equipment operator experience.Any operator remov- ing lime from a pond should be trained in the proper operation of the equipment and the characteristics of lime. Preferably, the operator should have previous pond/lagoon excavation experience. An owner/operator should provide direction and oversight of contractors regarding lime removal to meet quality needs and environmental controls. Carefully plan lime paste removal from a pond. Do it during dry weather conditions and agree with contractors to avoid excavation during wet weather conditions. Also, instruct contractors to take precautions to avoid releases of lime off site (such as from tires, leaking trailers, etc.). The following should also be considered: • Water run on and runoff—During excavation activity,pond berms and dikes should remain intact and be able to contain precipitation. An owner and/or operator should anticipate any necessary dewatering activities and plan pond excavation accordingly(leaving open previously excavated areas for water accumulation or trans- fer from working areas); and • Layout of the working area—if it is expected that the lime paste contains excessive free water, it may be necessary to stage excavated lime for dewatering before loading in the transport vehicle. This staging_area should drain back to the pond or the drainage water should otherwise be contained. Before leaving the pond site, all transport vehicles should be cleaned to avoid tracking lime from the site. 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.