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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, sample chain of custody procedures, and collection of quality
<br />control samples.
<br />t Groundwater sampling activities were conducted at the site on January 16, 2004. Groundwater
<br />sampling activities included measurement of the depth to groundwater at each of the seven
<br />' existing monitoring wells (MW-6, MW-7, MW-8, MW-9, MW-]0, MW-11, and MW-12) and
<br />two existing piezometers (P-2 and P-3), as well as purging and sampling of MW-10.
<br />The depth to groundwater was measured using an electronic water level indicator prior to the
<br />initiation of monitoring well purging and sampling activities. Prior to the collection of the
<br />groundwater sample, monitoring well MW-10 was purged dry using a dedicated Teflon bailer.
<br />The unfiltered groundwater sample was placed directly into laboratory-supplied sample bottles,
<br />which were subsequently placed into a cooler. The groundwater sample was collected in
<br />accordance with the groundwater monitoring protocol with the exception that the sample cooler
<br />was not chilled with ice. However, the groundwater sample was transported directly to the Sevem
<br />Trent Laboratories, Ina (STL) facility located in Denver, CO under industry standard chain-of-
<br />custody procedures and within hours of collection during cool ambient conditions. Based on the
<br />specified analyses, this deviation did not significantly change analytical laboratory results. STL
<br />did not provide a temperature blank with the sample containers. The groundwater sample was
<br />submitted for analysis of metals (arsenic, antimony, barium, beryllium, cadmium, chromium,
<br />lead, mercury, nickel, selenium, silver, thallium, aluminum, iron, manganese, magnesium,
<br />potassium, sodium, and calcium), alkalinity, pH, specific conductance, total dissolved solids
<br />(TDS), fluoride, chloride, nitrate, nitrate-nitrite, nitrite, hardness (as CaCo3), and sulfate. In
<br />addition, temperature, pH, and specific conductivity of the groundwater sample were measured in
<br />the field.
<br />2.2 Field Observations
<br />Observations of groundwater color, odor, and particulate content were noted in the Feld notebook
<br />for groundwater samples collected from the single monitoring well. The groundwater sample
<br />collected at monitoring well MW-] 0 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 pre-purging groundwater levels prior to sampling. The
<br />' sample was collected approximately 4.5 hours after completion of purging.
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