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2. Field Activities
<br />2.1 Groundwater Sampling
<br />Field sampling methods and procedures described below include sample collection methods,
<br />sample handling procedures, and sample chain of custody procedures.
<br />Groundwater sampling was conducted at monitoring well MW-10 on July 9, 2004. Groundwater
<br />sampling activities included measurement of the depth to groundwater at each of the existing
<br />monitoring wells (MW-6, MW-7, MW-8, MW-9, MW-10, MW-11, and MW-12) and at two
<br />existing piezometers (P-2 and P-3).
<br />Depth to groundwater was measured using an electronic water level indicator prior to the purging
<br />and sampling of monitoring well MW-10. Prior to the collection of the groundwater sample,
<br />monitoring well MW-10 was purged dry using a dedicated Teflon bailer, The unfiltered
<br />groundwater sample was placed directly into laboratory-supplied sample bottles, which were
<br />subsequently placed into a cooler with ice.
<br />The groundwater sample was collected in accordance with groundwater monitoring protocol set
<br />forth in the Groundwater Monitoring Plan (BBL, 2002) and transported to the Severn Trent
<br />Laboratories, Ino. (STL) facility located in Denver, CO. The groundwater sample was submitted
<br />for analysis of metals (arsenic, antimony, barium, beryllium, cadmium, chromium, lead, mercury,
<br />nickel, selenium, silver, thallium, aluminum, iron, manganese, magnesium, potassium, sodium,
<br />and calcium), alkalinity, pH, specific conductance, total dissolved solids (TDS), fluoride,
<br />chloride, nitrate, nitrate-nitrite, nitrite, hazdness (as CaCo3), and sulfate. In addition, temperature,
<br />pH, and specific conductivity were measured in the field.
<br />2.2 Field Observations
<br />Observations of groundwater color, odor, and particulate content were noted in [he field notebook
<br />for groundwater samples collected from the single monitoring well. The groundwater sample
<br />collected at monitoring well MW-10 was clear and had no discernable odor.
<br />Using the purging methods described in the previous section, monitoring well MW-10 was
<br />purged dry and allowed to recover to the pre-purging groundwater level prior to sampling. The
<br />sample was collected approximately 5 hours after completion of purging.
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