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11 August 2004 <br /> AGE-NC Project No. 04-1180 <br /> Page 6 of 8 <br /> A grouting inspection will be"scheduled with EHD personnel-. A proposed. monitoring well <br /> construction diagram is depicted in Figure 3. <br /> 4.3. WELL DEVELOPMENT AND SURVEY <br /> Development of the proposed wells will consist of a combination of bailing with a stainless steel <br /> bailer to remove the major portion of fine-grained sediment from inside the well,surging to flush <br /> out or draw in sediment from the filter pack and additional ground water evacuation(purging)with <br /> a Waterra-inertial pump to finish the removal of fine-grained sediment. Developmental purging <br /> activities will be continued until field parameter`(pH, electrical conductivity, and temperature) <br /> readings have stabilized and purged water is visually sediment-free: After development; the top of <br /> each well casing (well head) will be surveyed to determine its elevation relative to mean sea level <br /> and its X and Y coordinates based on longitude and latitude measurements. <br /> 4.4. GROUNDWATER SAMPLING PROCEDURES <br /> Groundwater sample collection will be performed in accordance with pertinent applicable sampling <br /> protocols, details of which are presented below. <br /> 4.4.1. Static Water.Level Measurements <br /> Before sampling and during quarterly ground water monitoring, static water level will be measured <br /> using an electric water level meter. Water level data will be recorded to the nearest 0.01-foot from <br /> a reference point marked of the top of the PVC well casing. Before and'after each use,the electric <br /> water level meter will be washed in an Alconox solution and rinsed with water. <br /> 4.4.2. Well Evacuation ` <br /> Subsequent to measurement of depth to water and prior to sampling,the well will be purged using <br /> an inertia pump or a disposable polyethylene bailer to ensure that the ground water sample is <br /> representative of the formation,rather than water standing in the well casing.The well will be purged <br /> until: 1)a minimum of three casing water volumes are.removed from the well; and/or.2)the field- <br /> measured ground water parameters pH, temperature and electrical conductivity have stabilized. <br /> However, if a well is purged dry prior to evacuating three casing volumes, a ground water sample . <br /> will be collected following 80 percent recovery of ground water within the well or after a minimum <br /> of 1 hour but within 8-hours,of well evacuation. <br /> Advanced GeoEnvironmental,Inc. <br />