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DocuSign Envelope ID: B20AOD3C-35CA-4018-9FFB-F17173AC33B8 <br /> 1 <br /> 141411TRI-STATE <br /> January 9, 2023 <br /> Mr. Zach Trujillo <br /> Environmental Protection Specialist <br /> Colorado Division of Reclamation, Mining & Safety <br /> Department of Natural Resources <br /> 1313 Sherman Street, Room 215 <br /> Denver, CO 80203 <br /> RE: Colowyo Coal Company L.P. <br /> Points of Compliance Wells Notification <br /> Dear Mr. Trujillo, <br /> Tri-State Generation and Transmission Association Inc. (Tri-State),is the parent company to Axial <br /> Basin Coal Company,which is the general partner to Colowyo Coal Company L.P. (Colowyo). Therefore, <br /> Tri-State on behalf of Colowyo,and in accordance with Rule 4.05.13(1)(c)(i),is providing this notification <br /> for elevated sampling results at a point of compliance well for Colowyo. <br /> Well LGSW-1 was sampled on December 12, 2022, and analytical results were received from the <br /> laboratory on January 3,2023. Table 16 in Volume 2C,Exhibit 7,Item 19 provides the applicable ground <br /> water standards for Colowyo. Per the analytical results received, one parameter at LGSW-1 exceeded the <br /> permit standard as presented on the following table. <br /> Sampling December 12,2022 Table 16 <br /> Location Parameter Analytical Results Standard <br /> LGSW-1 Total Dissolved 1,980 mg/l 1,840 mg/1 <br /> Solids TDS <br /> The sample taken on December 12, 2022, from LGSW-1 is the fifth sample acquired since the <br /> wells were drill and completed in late October of 2021. Colowyo did obtain several quarters of baseline <br /> data from temporary wells at the same locations that were monitored prior to permanent well installation. <br /> The baseline data for LGSW-1 provided a maximum TDS concentration of 1,570 mg/l, with the average <br /> TDS concentration being 1,331 mg/l. <br /> Comparison to upgradient well NGSW for this same sampling event provided the same TDS value <br /> of 1,980 mg/l. <br /> If you should have any additional questions regarding this notification,please feel free to contact <br /> Tony Tennyson at(970) 824-1232. <br /> P.O.BOX 33695 <br /> DENVER,CO 80233-0695 A Touchstone Energy <br /> 303-452-6111 Cooperative <br /> b R K` <br /> WWW.TRISTATE.COOP <br />