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2014 Groundwater <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 19, 2014. Groundwater sampling activities included measurement <br /> of the depth to groundwater and depth to well bottom at monitoring wells MW-7, MW-9, <br /> MW-11, MW-12, MW-13, DPA, and NP-1, and at piezometers P-2 and P-3. <br /> Monitoring wells DPA and NP-1 were installed by Brown and Caldwell in September of <br /> 2013 as part of a separate hydrogeologic study conducted at the site. Both monitoring <br /> wells are screened with the Codell Sandstone, thus groundwater elevations measured <br /> in these wells can be directly compared to the monitoring wells included in the GMP. <br /> The boring and well construction logs are included in Appendix C. Depth to <br /> groundwater was measured using an electronic water level 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 once prior to collecting the sample. <br /> The field water quality parameters in wells MWA2 and MWA3 including temperature, <br /> 6 <br />