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r <br /> I <br /> GOLDER RecelvE <br /> i) TR09 <br /> SEP 2?018 <br /> DI VISION OF �MATIO `O1 <br /> September 5, 2018 MININGAND SAFETY N Project No. 1810764 3 I z <br /> O o 3 <br /> N <br /> d � � <br /> Ms. Amy Eschberger 3 <br /> Colorado Division of Reclamation, Mining, and Safety N z <br /> Department of Natural Resources <br /> r <br /> 1313 Sherman St., Room 215 3 <br /> Denver, Colorado 80203 <br /> 0 <br /> RE: REQUEST FOR TECHINICAL REVISION OF PERMIT M-1977-348: CHANGES TO THE GROUNDWATER <br /> ANALYTE LIST AT THE BOETTCHER QUARRY <br /> Dear Ms. Eschberger <br /> On behalf of Holcim (US) Inc., Golder Associates Inc. (Golder) is submitting this request for a technical revision to '�-�� <br /> permit M-1977-348 to modify the groundwater monitoring program for the Boettcher Limestone Quarry located at `O <br /> 3060 West County Road 56, Laporte, Colorado 80535. <br /> This technical revision was requested by the Division of Reclamation, Mining, and Safety(DRMS) in their June 7, <br /> 2018 Minerals Program Inspection Report. The request from the DRMS was to modify the groundwater analyte <br /> list for the site to include parameters on Table 1 through Table 4 of the Regulation No. 41 -Colorado Basic <br /> Standards for Groundwater(5 CCR 1002), herein referred to as the BSGW. Based on a call between Golder, <br /> Holcim, and the DRMS on August 10, 2018, the technical basis for not including certain parameters in the <br /> proposed analyte list is provided below.Additionally, although not included in the BSGW, dissolved calcium, <br /> magnesium, sodium, and potassium are included in the proposed analyte list to be consistent with the current <br /> monitoring program, to provide a full suite of major ions to assist in interpretation of results, and for quality <br /> assurance/quality control purposes. <br /> An updated parameter list is included as Table 1. The following BSGW parameters have been excluded from the <br /> parameter list,with justification provided below: <br /> ■ Total Coliforms (30-day average and maximum value in 30 days): No sewage or septic system exists on site, <br /> and coliforms are not associated with cement kiln dust (CKD),which was generated at the site.As such, no <br /> source of coliforms is present at the site. <br /> ■ Asbestos: Asbestos is a product of six specific naturally occurring silicate materials of metamorphic origin <br /> (ATSDR, 2001; WHO 1996). Asbestos is not associated with CKD, and the geology of the site does not <br /> include metamorphic formations, eliminating the potential for the presence of natural asbestos. <br /> ■ Chlorophenol: Chlorophenol compounds are not naturally occurring and are not associated with CKD. <br /> Chlorophenols are used either directly as pesticides, or are converted into pesticides, or may be produced <br /> Golder Associates Inc. <br /> 44 Union Boulevard,Suite 300 Lakewood,Colorado,USA 80228 T:+1 303 980-0540 +1 303 985-2080 <br /> Golder and the G logo are trademarks of Golder Associates Corporation golder.com <br />