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• <br />Dowe F41a Pmjed <br />Iti QaaKQ Wate (laity <br />4.1 Monitorine Well Pureine <br />Before sampling each monitoring well, approximately three well casing volumes were purged <br />using a dedicated teflon bailer and nylon rope. The volume calculation used during well purging <br />was: <br />V= (Db - Dw) x 0.163 gal/ft <br />Where: V= One casing volume (gallons) <br />Db =Total well depth (feet) <br />Dw =Depth to water (feet) <br />0.163 =Conversion factor for 2-inch diameter casing <br />The total well depth and depth to water was measured from the top of the pvc well casing using <br />a Solinst water level indicator. Temperature, pH, and total dissolved solids (TDS) were measured <br />and recorded in the field during the purging procedure. The pH and temperature were measured <br />with an Orion 200 series portable meter. TDS was measured with a portable Hach meter. The <br />purged water volumes were measured in a calibrated 5-gallon bucket. Monitoring personnel wore <br />• disposable latex gloves during purging activities. Special care was taken to keep the bailer rope <br />Crom contacting the ground. Disposable plastic sheeting was placed on the ground surface around <br />each monitoring well to prevent contamination of the sampling equipment. <br />4.2 Sample Collection -Monitorine Wells <br />After three well casing volumes was purged Crom each well, and the temperature pH and TDS <br />stabilized, monitoring personnel collected the water samples. Two 40m1 VOA vials were filled <br />and inspected carefully to avoid trapping headspace bubbles. The remaining bailer volume was <br />split between five sample bottles. Subsequent bailer volumes also were split between the five <br />sample bottles. The samples were submitted to the laboratory for analysis of dissolved metals, <br />anions, pH, alkalinity, specific conductance, total dissolved solids, turbidity, hardness and total <br />suspended solids. The groundwater samples were stored in a cooler on blue ice, and hand <br />delivered to Evergreen Analytical, Inc. for analysis. Dedicated teflon bailers were used to sample <br />each well to prevent cross-contamination. The bailers were cleaned after sampling using non- <br />phosphate soap, a methanol rinse, and a triple rinse with deionized water. The nylon bailer rope <br />was discarded after sampling each well. Clean latex gloves were used to sample each well. <br />Rgjeti Nanber. 769`9!-042 <br />• Apd 18, 1991 <br />Page 3 <br />