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1 <br /> 12 September 2008 <br /> AGE-NC Project No. 98-0440 <br /> ' Page 5 of 6 <br /> be placed by pouring through the augers (tremmie pipe). The EHD will be notified for grout <br /> inspection at least 48 hours prior to conducting grouting procedures. A typical monitoring well <br /> diagram is illustrated on Figure 4.. <br /> 3.3. WELL DEVELOPMENT AND SURVEY <br /> { i# <br /> Development will consist of a combination of bailing to remove the major portion of fine-grained <br /> sediment from inside the wells, surging to flush out or draw in sediment from the filter pack, and <br /> additional bailing to finish the removal of sediment.Development activities will be continued until <br /> field parameter(pH,electrical conductivity,and temperature)readings Have stabilized.Additionally, <br /> well-head elevations will be surveyed by a licensed surveyor. <br /> ,p <br /> 3.4. GROUND WATER SAMPLING ° <br /> Ground water sample collection will be performed in accordance with the EHD's Recommended <br /> Groundwater-Sampling Guidelines, dated 15 February 1995. <br /> ;e <br />} <br /> 3.4.1. Static Water Level Measurements <br /> Before purging and sampling during ground water monitoring events, static water level will be ► <br /> measured using an electric water level indicator. Water level data will be recorded to the nearest <br /> 0.01 foot from a reference point marked of the top of the PVC well casing.Before and after each use, <br /> the measurement device will be rinsed with water. <br /> 4 <br /> 3.4.2. Well Evacuation <br /> Subsequent to measurement of depth to water and prior to sampling,wells will be purged using a <br /> Wattera inertia pump or a disposable bailer to ensure the sample is representative of the formation, <br /> rather than water standing in the well casing. Wells will be purged until: 1) a minimum of three <br /> casing-water volumes is removed from the well; and/or 2)j the field-measured ground water <br /> parameters have stabilized. <br /> However, if a well is purged dry prior to evacuating three casing-water volumes, a ground water <br /> sample will be collected following 80 percent recovery of ground water within the well or within 8 <br /> hours of well evacuation. <br /> A <br /> Advanced GeoEnvironmental,Inc. <br /> !F <br />