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TELESTQ <br /> SOLUTIOHSIINCORPORATED <br /> April 13, 2020 <br /> Via Electronic Mail <br /> Stephanie Fancher-English <br /> Loveland Ready-Mix Concrete, Inc. <br /> 644 N Namaqua Avenue <br /> Loveland, Colorado 80537 <br /> Subject: Loveland Ready-Mix Concrete, Inc. (LRM) <br /> Knox Pit Permit No. M-2017-036- Q4 2019 and Q1 2020 Water <br /> Quality Results <br /> Dear Stephanie: <br /> Please find attached, additional baseline groundwater quality data for LRM Knox Pit <br /> Permit No. M2017-036 prior to exposing groundwater and/or initiating dewatering <br /> operations at the LRM Knox Pit (Site). As part of the regulatory approval process, the <br /> Colorado Division of Reclamation, Mining and Safety(DRMS)required that LRM submit <br /> a groundwater quality monitoring plan and sufficient data to determine baseline <br /> groundwater quality prior to mining. Telesto Solutions Inc. (Telesto) collected baseline <br /> groundwater data, and subsequently conducted a baseline groundwater quality evaluation <br /> to assess potential impacts associated with the Site. Telesto summarized the findings in a <br /> baseline water quality evaluation report (Telesto, 2019), which includes water quality <br /> sampling results from 1" Quarter 2018 to 3rd Quarter 2019. This letter provides additional <br /> water quality sampling results collected during 4th Quarter 2019 and 1St Quarter 2020. <br /> Compliance wells and Site locations are provided in Figure 1. <br /> Telesto conducted quarterly sampling on wells, MW-06, MW-10, MW-12, MW-13, and <br /> MW-19 from February 2018 to present. Analytical Laboratory Services — Fort Collins <br /> (ALS), conducted all laboratory analysis for all the groundwater samples collected by <br /> Telesto. 4th Quarter 2019 and 1St Quarter 2020 laboratory results are summarized in <br /> Attachment 1 and the ALS lab reports are provided in Attachment 2. <br /> The Site's overall water quality data is compared with CDPHE WQCC Regulation 41: <br /> Basic Standards for Groundwater. The 4th Quarter 2019 and 1st Quarter 2020 water <br /> quality results are consistent with previous concentration levels. <br /> Please feel free to contact me at(970)484 7704 or via email at tgerken'a telesto-inc.com if <br /> you have any questions or comments concerning this submittal. <br /> Colorado Office(Corporate) Grand Junction New Mexico Office <br /> 750 14th Street SW 751 Horizon Court,Suite 109 1303 Pope Street <br /> Loveland,Colorado 80537 Grand Junction,Colorado 81506 Silver City,New Mexico 88061 <br /> 970-484-7704/970-484-7789(FAX) 970-697-1550 575-538-56201575-538-5625(FAX) <br />