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• <br />Surface water location DFSW-1 is located in the ephemeral stream channel approximately 100 <br />feet south of monitoring well DFMW-1. Surface water location DFSW-2 is located on the north <br />bank of the St. Vrain River, west of the bridge on the Southwestern Portland Cement Company <br />entrance road. Surface water location DFSW-3 is located on the west bank of the St. Vrain <br />River, north of the bridge on North 63rd road. The monitoring wells and surface water locations <br />were approximately located by the field geologist on a topographic map and have not been <br />surveyed. DFSW-1 is upgradient of the mine site and downgradient of the Syntex chemical <br />landfill site. It is used to determine the quality of water flowing into the mine area in <br />intermittent drainages from the north. DFSW-2 is in the St. Vrain River upgradient of the mine <br />area. DFSW-3 is in the St. Vrain River downgradient of the mine area. These locations will <br />allow determination of water quality impacts on the St. Vrain River due to discharge from the <br />mine. <br />4.0 SAMPLING PROTOCOL <br />4.1 Monitorine Well Purein¢ <br />• Before sampling each monitoring well, approximately three casing volumes were purged using <br />a stainless steel bailer and nylon rope. The following equation was used to determine the volume <br />of one casing: <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.[63 =Conversion factor for 2-inch diameter casing <br />The total well depths and depths to water were measured from the tops of the well casings using <br />a Solinst water level indicator. Temperature and pH were measured and recorded after each <br />volume was purged. The pH was measured with a Hach pH meter, and the temperature with a <br />Taylor pocket thermometer. The purged water volumes were measured in a calibrated 5-gallon <br />bucket. Monitoring personnel wore disposable latex gloves during purging activities. Special cart <br />was taken to keep the bailer rope from coming in contact with the ground. Disposable plastic <br />was placed on the ground surface around each monitoring well. <br />Paoje~ N~m6c 79]-042 <br />• ]uly 1S, 1980 <br />Page 2 <br />