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1 � <br /> 1w, LYTLE WATER SOLUTIONS, LLC <br /> September 25,2018 <br /> Battle Mountain Resources, Inc. <br /> P.O. Box 310 <br /> San Luis,Colorado 81152-0310 <br /> Attn: Mr. Julio Madrid <br /> Environmental Coordinator <br /> Subject: Site 1 Lysimeter Replacement Report, Battle Mountain Resources,Inc., <br /> San Luis, Colorado. <br /> Project No. 1006-04 <br /> Dear Julio: <br /> Battle Mountain Resources Inc. (BMRI)requested that Lytle Water Solutions,LLC(LWS)replace <br /> existing porous cup lysimeters in the vicinity of the collection pond. These porous cup lysimeters <br /> are used to evaluate if there is sufficient water in the unsaturated soil zones for water samples to be <br /> collected for the purpose of water quality analysis. Water quality samples are collected from the <br /> porous cup lysimeters to evaluate if there is leakage from either the tailings management facility <br /> (TMF) or collection pond. The placement of the porous cup lysimeters around the collection pond <br /> was originally required under the decree in 89CW32, and the lysimeters were installed consistent <br /> with the requirements of that decree. In 2018, it was determined that two of the recently replaced <br /> lysimeters were not working properly at site 1 and would have to be replaced.This failure has been <br /> attributed to poor quality lysimeters from the manufacturer. LWS has since switched lysimeter <br /> suppliers and found that the new equipment is far more reliable.This installation report is for the two <br /> replacement lysimeters. <br /> There are three sets of lysimeters located directly downgradient of the lined TMF, adjacent to the <br /> collection pond, as shown in Figure 1. According to the site 1 lysimeter installation report dated <br /> October 22,2014, the deep lysimeter that was replaced was set at 50 feet(ft), at the bottom of the <br /> colluvial materials in contact with the Santa Fe Formation at lysimeter site 1, and the shallow <br /> lysimeter was set at a clay lense at 25 feet found at lysimeter sites 1 and 2. The replacement <br /> lysimeters are located approximately 15-20 ft north of the corresponding original lysimeters at site <br /> 1. <br /> 640 PLAZA DRIVE, SUITE 170 PHONE: 303-350-4090 <br /> HIGHLANos RANCH, CO SO129 FAx: 303-350-4095 <br /> WWW.LYTLEWATER.COM E-MAIL: LWB@LYTLEWATER.COM <br />