Laserfiche WebLink
%.J <br /> 15 April 1999 <br /> AGE-NC Project No. 98-0520 <br /> Page 9 of 10 <br /> 94-pound sack of cement. The grout will be placed over the bentonite as a annular seal. Grouting <br /> procedures will be inspected by PHS-EHD personnel. A traffic-rated well box will be installed over <br /> the wells, in accordance with County regulations. Following completion of the monitoring wells, <br /> well elevations and locations will be surveyed by AGE personnel,relative to monitoring well MW-1. <br /> 4.4. WELL DEVELOPMENT <br /> Development will consist of a combination of bailing to remove the major portion of fine-grained <br /> sediment from inside the well, 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. <br /> 4.5. 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 /> 4.5.1. 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 indicator. 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 <br /> measurement device will be rinsed with water. <br /> 4.5.2. Well Evacuation <br /> Subsequent to measurement of depth to water and prior to sampling,the upper water in the well will <br /> be purged using a disposable bailer of pug-pump to ensure that the sample is representative of the <br /> formation,rather than water standing in the well casing. The well will be purged until: 1)a minimum <br /> of three casing volumes is removed from the well; and/or 2) the field-measured ground water <br /> parameters have stabilized. However,' well is purged dry prior to evacuating three casing volumes, <br /> a ground water sample will be collected following 80 percent recovery of ground water within the <br /> well or within 8-hours of well evacuation. <br /> Advanced GeoEnvironmental,Inc. <br />