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October 2012 <br />• What is the current vertical and horizontal extent of impacted groundwater? <br />• Can it be shown the impact is confined to within the permit area? <br />• What specifically is the local geology? <br />• How might the site geology influence the migration of impacted groundwater? <br />• How does the site geology and migration of impacted groundwater relate to construction <br />of the site monitoring wells and nearest surrounding /downgradient wells? <br />• How does the current extent of impacted groundwater and site geology compare to the <br />construction of surrounding wells (i.e., what is the likelihood that other nearby wells may <br />be impacted and are they in the same aquifer)? <br />• Is there a well that is currently representative of background conditions in the same <br />formations that is now showing evidence of impact? <br />• What steps should be taken to minimize the current and future impact(s) to site <br />groundwater? <br />• Additional appropriate monitoring and compliance wells need to be installed for future <br />groundwater monitoring. <br />i \10 \81640\ 0400\ charactenzahonpin_ fnl- 23octl2 \charactenzahonpin_fnl- 23octl2 docx <br />Attorney Work Product, <br />Confidential and Privileged <br />1 <br />103- 81640A <br />1.0 INTRODUCTION <br />Golder Associates Inc. (Golder) is pleased to submit this groundwater characterization work plan (Plan) to <br />the State of Colorado Division of Reclamation, Mining and Safety (DRMS) on behalf of Holcim (US) Inc. <br />(Holcim). This Plan outlines the approach and procedures that will be performed for further <br />characterization of the aquifer and current uses of groundwater in the area of the Boettcher Limestone <br />Quarry (Site) in Laporte, Colorado, to determine an appropriate path forward to achieve full release of <br />reclamation liability for the Site. This work was requested by the DRMS, in their letter dated June 25, <br />2012 to Michael Toelle of Holcim (DRMS 2012). <br />1.1 Site Location <br />The Boettcher Limestone Quarry is located in Larimer County near Laporte, Colorado, as shown on <br />Figure 1. More specifically, the quarry comprises portions of Township 8 and 9 North, Range 69 West of <br />the 6th Principal Meridian. The original permit to operate the Boettcher Quarry (Permit No. M -77 -348) <br />was approved on October 10, 1978 by the Colorado Mined Land Reclamation Board (MLRB), of the <br />Department of Natural Resource to Ideal Basic Industries. Although the Boettcher Quarry had several <br />owners during the active lifetime of the quarry, the quarry is currently owned by Holcim (US) Inc., thus <br />Holcim will be referred to as the owner /operator in this document. <br />1.2 DRMS Questions /Issues <br />In their June 25, 2012 letter, the DRMS outlined a number of issues /questions that they felt needed to be <br />addressed, at a minimum, for Holcim to eventually achieve full release of reclamation liability for the Site <br />in accordance with 3.1.7 of the Construction Materials Rule. These issues /questions are presented in the <br />following bullet list. <br />/ Golder <br />Associates <br />