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Climax Molybdenum <br /> A Freeport-McMoRan Company Mill Engineering <br /> Memo <br /> To: Climax Environmental File <br /> From: Russ Jungnitsch,Climax Engineering <br /> Date: January 14, 2019 <br /> Re: West Interceptor Improvements Phase D <br /> Background: <br /> The West Interceptor was originally constructed in the 1970's in order to collect runoff from Kokomo <br /> Creek, Searle Gulch, several unnamed drainages, and overland surface runoff from the west side of <br /> the valley and discharge it into Tucker Creek.This is runoff that would otherwise flow into Robinson <br /> Tailings Storage Facility(TSF), Tenmile TSF, Mayflower TSF,the 3-Dam seepage collection system, <br /> and the 5-Dam seepage collection system.The interceptor is approximately 32,000 feet long and <br /> begins as an open channel just north of Lake Irwin near the west abutment of 2-Dam and extends to <br /> Searle Gulch, where the interceptor transitions to buried pipe.The buried pipe section collects surface <br /> runoff through several inlets and eventually discharges into Tucker Creek between 5-Dam Pump <br /> Station and the PDWTP.This interceptor keeps runoff water from areas surrounding the Climax site <br /> away from industrial areas and returns it to clean waterways. <br /> Purpose: <br /> This project will improve the West Interceptor's ability to convey large amounts of water around and off <br /> of the Climax property. The purpose of the West Interceptor system is to intercept surface runoff from <br /> areas surrounding the Climax process water systems and route the flow to natural waters below the <br /> mine facilities. Considering the criticality of these systems in the management of water at Climax, the <br /> maintenance and upgrade of these systems should be a high priority to reduce risk at the site. By doing <br /> this, Climax will therefore reduce the volume of water that enters the process water system,which <br /> reduces water treatment and water handling requirements at the site.The design of the water handling <br /> and treatment systems are based on inflow scenarios that assume a functioning interceptor system, so <br /> it is critically important to operate and maintain the interceptors so that this assumption remains valid. <br /> Improvement of the interceptor's capability to carry water, and the integrity of its structural aspects will <br /> assist in assuring the successful management of water on and around the Climax property.These <br /> improvements include increasing the size of pipe that water currently runs through, adding in spillways <br /> below large drainage areas, and adding inlet and outlet structures to culverts along the system. <br /> Scope of the Project: <br /> In 2018 Phase C of the interceptor improvements were completed. This project is a continuation of that <br /> work and will consist of replacing approximately 3,700 feet of a 46-inch CMP pipe with a 60-inch <br /> CHDPE(corrugated HDPE) pipe. The work will also include various ancillary items such as culvert <br /> inlet and outlet transition structures, and fill placement. The attached drawings,#3-520-00401 thru 3- <br /> 520-00416, show the planned improvements to the West Interceptor. <br /> Pagel1 <br />