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4.. / k4 KLEiNFELDER Approximately 48 hours after development, water levels will be measured and the three wells will be purged and sampled. Purging and sampling will be accomplished with a Teflon bladder pump and/or bailer. During the purging of the wells, field parameters (pH, �- w. conductivity, and temperature) will be monitored. Samples will be collected after the field parameters have stabilized (normally requiring the removal of three to five well volumes). ` Water samples will be collected in containers supplied by and prepared by the laboratory. These sample containers will be immediately sealed after sample collection and placed in an iced cooler. At the end of the day, the water samples will be delivered under chain-of- custody to an analytical laboratory certified by the state for analysis of BTEX by EPA �. Method 602, TPH by GC-FID, and organic lead. e The sampling equipment will be washed in a trisodium phosphate solution and rinsed in distilled water or steam cleaned prior to use in each monitoring well. Purged water will be containerized in 55-gallon drums and will become the responsibility of the client. 3.6 MONITORING WELL ELEVATION SURVEY 6P A ground water flow direction will be estimated from the three monitoring wells. The +-. relative elevations of the top of the 2-inch PVC casings will be surveyed for the three wells. The elevation of the top of the PVC casing will be surveyed and tied into an existing benchmark or Iandmark. Survey accuracy is 0.01 foot. Depth to the static ground water table will be measured for the top of each PVC casing. The depth to water will then be subtracted from the elevation of the top of the well casing to provide a water table elevation for each monitoring well location. The ground water flow direction will be estimated from the measured water table elevations. w. U �- 181-89-719 7