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1 <br />■ ARCADIS <br />1 <br />1 2. Field Activities <br />1 2.1 Groundwater Sampling <br />Field sampling methods and procedures described below include sample collection <br />I methods, sample handling procedures and sample chain of custody procedures. <br />Groundwater sampling was conducted at monitoring wells MW -7, MW -12 and MW -13 <br />(Figure 2) on March 29 and 30, 2011. Groundwater sampling activities included <br />I measurement of the depth to groundwater and depth to well bottom at each of the <br />existing monitoring wells (MW -7, MW -9, MW -11, MW -12 and MW -13) and at two <br />existing piezometers (P -2 and P -3). Depth to groundwater was measured using an <br />1 electronic water level indicator. <br />Depth to groundwater and well bottom was measured prior to purging and sampling <br />1 monitoring wells MW -7, MW -12 and MW -13. Prior to collecting the groundwater <br />samples, these monitoring wells were purged using a disposable Teflon bailer. The <br />unfiltered groundwater sample was collected using a disposable Teflon bailer and <br />I placed directly into laboratory- supplied sample bottles, which were subsequently <br />placed into a cooler with ice. <br />1 The unfiltered groundwater sample was collected in accordance with groundwater <br />monitoring protocol set forth in the GMP (BBL 2002) and shipped to the ACZ <br />I Laboratories, Inc. (ACZ) Facility located in Steamboat Springs, Colorado. The sample <br />was submitted for analysis of metals (iron, manganese, potassium and sodium), total <br />dissolved solids (TDS) and sulfate. The samples for dissolved iron, total dissolved <br />I solids and sulfate were lab filtered upon receipt. In addition, temperature, pH and <br />specific conductance were measured in the field. <br />I 2.2 Field Observations <br />In general, disposable bailers were used to purge three well volumes in each well <br />I before collecting a water sample. However due to the slow recharge in MW -7 three <br />well volumes were not able to be purged from MW -7. MW -7 was purged dry and left to <br />recharge prior to collecting the sample. The field water quality parameters including <br />I temperature, pH and specific conductivity were stable (i.e., less than a 10 percent <br />change between readings) after three well volumes and samples were subsequently <br />collected from each well using the disposable bailer. One duplicate sample was <br />1 collected from MW -7. Samples were placed directly into laboratory- supplied <br />1 <br />1 <br />2011 Groundwater <br />Monitoring Report <br />Florence, Colorado <br />5 <br />