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Final April 2009 <br />Groundwater <br />ARCADIS Monitoring Report <br />I Florence, California <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 April 21, 2009. Groundwater sampling activities included measurement of <br />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 (arsenic, selenium, aluminum, iron, manganese, <br />magnesium, potassium, sodium and calcium), total dissolved solids (TDS), alkalinity, <br />fluoride, chloride, nitrogen (ammonia), nitrate-nitrite, hardness (as calcium carbonate <br />[CaCO31) and sulfate. The samples for dissolved calcium, dissolved iron, dissolved <br />magnesium, chloride, fluoride, nitrate/nitrite, total dissolved solids and sulfate were lab <br />filtered upon receipt. In addition, temperature, pH and specific conductance were <br />measured in the field. Nitrite is not expected to be present at this site; therefore, the <br />analytical results for nitrate-nitrite, discussed in Section 3, will be reported as 100 <br />percent nitrate. Nitrate is used widely in inorganic fertilizers, in explosives, as a food <br />preservative and as a raw chemical in industrial processes. Nitrite is used <br />predominately as a food preservative, especially in cured meats. Nitrite levels in most <br />water supplies are very low. <br />cAdocuments and setGngs\stobgy4ny documents\holcim\025911978_holcimreg version_final.docx 5