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TELESTQ <br /> 5 0 L U T 1 O N 5. I C) a N C) R A T E D <br /> June 22, 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 Q2 2020 Water <br /> Quality Results <br /> Dear Stephanie: <br /> Please find attached 4th Quarter 2019 through 2"d Quarter 2020 baseline groundwater <br /> quality data for LRM Knox Pit Permit No. M2017-036. These samples are prior to <br /> exposing groundwater and/or initiating dewatering operations at the LRM Knox Pit(Site). <br /> Figure 1 displays sample locations (wells) MW-06, MW-10, MW-12, MW-13, and MW- <br /> 19. Analytical Laboratory Services — Fort Collins (ALS), conducted the laboratory <br /> analysis. Attachment 1 summarizes 4th Quarter 2019 and I" Quarter 2020 laboratory <br /> results, and Attachment 2 provides the ALS lab reports. <br /> Attachment 1 compares recent sample water quality data to CDPHE WQCC Regulation <br /> 41: Basic Standards for Groundwater. All parameters are below standards except for <br /> uranium in wells MW-6 and MW-10, both of which have exhibited uranium above <br /> standards in the past, and remain consistent with past readings. <br /> Both quarter's samples are consistent with previous concentration levels with the <br /> exception of mercury in the 2"d Quarter 2020 water quality results. We attribute the <br /> higher mercury concentrations to field/equipment contamination or mercury in the <br /> distilled water used to decontaminate equipment. This claim is supported in the mercury <br /> concentration from the field blank(distilled water). The field blank displays a mercury <br /> concentration of 0.0013 mg/L, which is consistent with the increase shown in other wells <br /> sampled on the Site. <br /> Please feel free to contact me at(970)484 7704 or via email at t__,erl.,�n .i t,2 IC,l, inr.C�Im if <br /> you have any questions or comments concerning this submittal. <br /> Sincerely, <br /> Colorado Office (Corporate) Grand Junction New Mexico Office <br /> 750 1411 Street SW 751 Horizon Court,Suite 109 1303 Pope Street <br /> Loveland,Colorado 80537 Grand Junction,Colorado 81506 Silver City,New Mexico 88061 <br /> 970484-7704/970-484-7789(FAX) 970-697-1550 575-538-5620/575-538-5625(FAX) <br />