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Golder <br /> Associates <br /> June 17, 2014 Project No. 1400159 <br /> Mr. Eric Scott <br /> Colorado Division of Reclamation Mining and Safety <br /> Department of Natural Resources <br /> 1313 Sherman St., Room 215 <br /> Denver, Colorado 80203 <br /> RE: REQUEST FOR TECHNICAL REVISON OF PERMIT M-1977-348: CHANGES TO THE <br /> ANALYTICAL LIST FOR GROUNDWATER SAMPLING AT THE BOETTCHER QUARRY <br /> Dear Mr. Scott: <br /> On behalf of Holcim (US) Inc., Golder Associates Inc. (Golder) is submitting this request for a technical <br /> revision to permit M-1977-348 to modify the suite of constituents included in the groundwater monitoring <br /> program for the Boettcher Limestone Quarry located at 3060 West County Road 56, LaPorte, Colorado <br /> 80535. <br /> The laboratory analytical results for sampling events from 2011 through the 1"quarter of 2014 have been <br /> provided under separate covers. Additionally, a comprehensive summary and interpretation of the results <br /> is presented in the Groundwater Characterization Report for the site dated April 28, 2014. <br /> Changes to the analyte list were discussed in the May 28, 2014 meeting between Golder, Holcim (US) <br /> Inc. and the Division of Reclamation Mining and Safety (DRMS), as summarized in the May 30, 2014 <br /> DRMS memo. Golder reviewed analytical results in order to determine which constituents have generally <br /> remained below their respective benchmark level and/or not been detected above their respective <br /> detection limit. Based upon a review of the data collected to date, dissolved arsenic, chromium, copper, <br /> lead, selenium, thallium, zinc and fluoride are recommended to be discontinued from the groundwater <br /> monitoring program. Attachment 1 provides concentration versus time plots for these analytes for <br /> sampling events conducted through the 1st quarter of 2014. Table 1 contains the proposed suite of <br /> constituents to be monitored in wells MW-1 through MW-7. <br /> If you have any questions or comments about this request, please contact the undersigned at <br /> (303)980-0540. <br /> Sincerely, <br /> GOLDER ASSOCIATES INC. <br /> IAA 4� F— . ►')'! Q.�.�-�-r <br /> Sara Harkins Randy March, P.E., P.G. <br /> Geologist Principal Geological Engineer <br /> Attachments: <br /> Table 1 —Proposed Analyte List- Groundwater Monitoring Wells MW-1 through MW-7 <br /> Attachment 1 —Concentration vs. Time Plots <br /> i:\14\1400159\0110\changesanalylistgmamplingbcettcher_fnl-17jun14\1400159 changesanalylistgwsamplingboettcher_fn1-17jun14.docx <br /> Golder Associates Inc. <br /> 44 Union Boulevard,Suite 300 �1 <br /> Lakewood,CO 80228 USA ' <br /> Tel: (303)980-0540 Fax: (303)985-2080 www.golder.com <br /> Golder Associates:Operations in Africa,Asia,Australasia,Europe,North America and South America <br /> Golder,Golder Associates and the GA globe design are trademarks of Golder Associates Corporation <br />