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2010 Groundwater <br />• <br />ARCADIS Monitoring Report <br />Florence, Colorado <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, 2010. 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 or <br />peristaltic pump. The unfiltered groundwater sample was collected using a disposable <br />bailer or peristaltic pump with clean, disposable tubing and placed directly into <br />laboratory-supplied sample bottles, which were subsequently placed into a cooler with <br />ice. <br />The unfiltered groundwater sample was collected in accordance with groundwater <br />monitoring protocol set forth in the GMP (BBL 2002) and transported to the ACZ <br />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 />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 three <br />well volumes were not able to be purged from MW-7. MW-7 was left to recharge prior <br />to collecting the sample. In addition, MW-7 had a sulfur-like odor and was more turbid <br />than previous sampling events. The field water quality parameters including <br />temperature, pH and conductivity were stable (i.e., less than a 10 percent change <br />between readings) after three well volumes and one sample was collected from each <br />well using the disposable bailer. Samples were placed directly into laboratory-supplied <br />C? <br />GACOMMOM2551O\10 Final Reports and PresentaticneWarch 2010\TextVioldm March 2010 Final GW Monitoring.d- 5