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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.
<br />Groundwater sampling activities were conducted at the site on April 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-9, MW-10, MW-11, and MW-12) with the exception of
<br />MW-8, which was not measurable on that date due to adverse weather conditons. Depth to
<br />groundwater measurements were also collected at two existing piezometers (P-2 and P-3) and a
<br />groundwater sample was collected from MW-10.
<br />The depth to groundwater was measured using an electronic water level indicator prior to the
<br />monitoring well purging and sampling activities. Prior to the collection of the groundwater
<br />sample, 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 the groundwater monitoring protocol
<br />(BBL, 2002) and transported to the Severn Trent Laboratories, Ina (STL) facility located in
<br />Denver, CO. The groundwater sample was submitted for analysis of metals (arsenic, antimony,
<br />barium, beryllium, cadmium, chromium, lead, mercury, nickel, selenium, silver, thallium,
<br />aluminum, iron, manganese, magnesium, potassium, sodium, and calcium), alkalinity, pH,
<br />specifc conductance, total dissolved solids (TDS), fluoride, chloride, nitrate, nitrate-nitrite,
<br />nitrite, hardness (as CaCo3), and sulfate. hr addition, temperature, pH, and specific conductivity
<br />of the groundwater sample were measured in the field.
<br />2.2 Field Observations
<br />Observations of groundwater color, odor, and particulate content were noted in the 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 pre-purging groundwater levels prior to sampling. The
<br />sample was collected approximately 5 hours after completion of purging.
<br />1:\Holcim\GW Monitoring ReporCSWpril 2004\104342I86.doc 2_]
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