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JUN-02-2003 16 27 BBL GOLDEN. CD 303 231 9571 P.03/03 <br />4.3 Well Sampling <br />In accordance with applicable Colorado state regulations for mining operations (DMG, 2001), groundwater <br />quality samples will be collected from monitoring wells (MW-7, MW-8, MW-9, MW-10, MW-I I, and MW-I2) <br />at the Holcim Site. Prior to purging and sampling of monitoring wells, groundwater elevatiens will be measured <br />using an electronic water level indicator. Water levels will be measured using an electronic water level meter. <br />Readings will be referenced to the top of casing of each monitoring well. The water level meter will be rinsed <br />with distilled water between each location. <br />Each monitoring well will be purged prior to sampling. Due to the low hydraulic conductivity of the aquifer, it <br />may not be possible to purge three well casing volumes the day of sampling. If it is not possible to purge three <br />well casing volumes, each monitoring well will be pumped dry then allowed to recover to static water levels <br />prior to sampling. Groundwater samples will be collected using ]ow flow sampling technique consistent with <br />EPA protocols (Pals and Bazcelona, 1995). For quality assurance-quality control (QA/QC) purposes, a <br />groundwater sample for duplicate analysis. Sampling equipment will be cleaned between sampling of each well <br />using industry standazd practices. Field pH, conductivity, and temperature will be measured on groundwater <br />samples collected from the monitoring wells. Field measurements will be taken using a Yellow Springs <br />Instruments YSI 35DD or comparable water quality meter- <br />Groundwater samples collected for laboratory analysis will be placed on ice in coolers and shipped to a qualified <br />analytical laboratory, using an overnight delivery service under industry standard chain of custody practices. A <br />list of analytes, analytical methods, and method detection limits for groundwater sample analysis is provided in <br />Table 8. This list of analytes, analytical methods, and detection limits may be revised based on DMG's final <br />determination of ambient groundwater quality and groundwater protection lcvcls for the Sitc. <br />Holcim anticipates that installation of the new monitoring wells and sampling of all existing and new monitoring <br />wells will occur prior to March 31, 2003, assuming timely DMG review and approval of the GMP. To mcct <br />DMG requirements, sampling of all monitoring wells will continue on an annual basis. To assist with <br />establishing ambient groundwater quality for the Site, three additional quartets of samples will be collected from <br />MW-10 prior to December 31, 2003. Results for the sampling and analysis of the annual groundwater quality <br />samples will be provided to DMG in an annual report ro be submitted within 40 days of the completion of field <br />work for each annual sampling event. Results of the additional three quarters of samples from monitoring well <br />MW-10 will be forwarded to DMG as soon as practicable after appropriate review by Holcim. <br />4.4 GKD Leach Testing <br />Semi-annual sampling and leach Vesting of CKD is required per the DMG's first adequacy review letter for TR- <br />06 (DMG, 2000). CKD samples will be collected upstream of the pug mill prior to addition of water. Sample <br />collection will occur on asemi-monthly basis. CKD samples will be shipped to a qualified analytical laboratory <br />under industry standard chain of custody. Results for the semi-annual sampling and analysis of the CKD <br />samples will be provided to DMG in an annual report to be submitted within 90 days of the completion of field <br />work for each armual groundwater sampling event. <br />BBL is currently evaluating three leaching procedures far analysis of the CKD; the Toxicity Characteristic <br />Leaching Procedure (TCLP), the Synthetic Precipitation Leaching Procedure (SPLP) using west of the <br />Mississippi synthetic precipitation, and the Meteoric Water Mobility Procedure (MWMP). These three leaching <br />procedures and chemical analysis of the leachate will be conducted at a qualified analytical laboratory. A list of <br />analytes, analytical methods, and method detection limits for CKD ]eachate sample analysis is provided in Table <br />BLASLAND, BOUCK 8 LEE INC <br />~ans/m engineers d scientists 42 <br />4lowdwmwMOakorlnp YLaa.dx <br />TOTAL P.03 <br />