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ARCADIS <br />2. Field Activities <br />2.1 Groundwater Sampling <br />Field sampling methods and procedures described below include sample collection <br />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 18, 2013. Groundwater sampling activities included measurement <br />of the depth to groundwater and depth to well bottom at each of the existing monitoring <br />wells (MW -7, MW -9, MW -11, MW -12 and MW -13) and at two existing piezometers <br />(P -2 and P -3). Depth to groundwater was measured using an electronic water level <br />indicator. <br />Depth to groundwater and well bottom was measured prior to purging and sampling <br />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 />placed directly into laboratory - supplied sample bottles, which were subsequently <br />placed into a cooler with ice. <br />The unfiltered groundwater samples were collected in accordance with groundwater <br />monitoring protocol set forth in the original GMP (BBL 2002) and shipped to the ACZ <br />Laboratories, Inc. (ACZ) Facility located in Steamboat Springs, Colorado. The samples <br />were 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 />solids and sulfate were lab filtered upon receipt. In addition, temperature, pH and <br />specific conductance were measured in the field. <br />2.2 Field Observations <br />In general, disposable bailers were used to purge three well volumes in each well <br />before collecting a water sample. However due to the slow recharge in MW -7 it was <br />not possible to purge three well volumes from MW -7 within a reasonable period of <br />time. MW -7 was purged dry and left to recharge prior to collecting the sample. The field <br />water quality parameters including temperature, pH and specific conductivity were <br />stable (i.e., less than a 10 percent change between readings) after three well volumes <br />and samples were subsequently collected from each well using the disposable bailer. <br />One duplicate sample was collected from MW -12. Samples were placed directly into <br />2013 Groundwater <br />Monitoring Report <br />Florence, Colorado <br />0 <br />