Laserfiche WebLink
2$ July 1999 <br /> AGE-NC Project No 96-0263 <br /> Page 8 of 9 <br /> AGE personnel, relative to monitoring well MW-1 <br /> 4 2 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 2 1 Static Water Level Measurements <br /> Before sampling and during quarterly ground water monitoring,static water level and possible a free- <br /> product thickness will be measured using an electric oil/water level indicator Water level data will <br /> be recorded to the nearest 0 01 foot from a reference point marked of the top of the PVC well casing <br /> Before and after each use,the electric oil/water level indicator will be washed in an Alconox solution <br /> and rinsed with water <br /> 4 2 2 Well Evacuation <br /> Subsequent to measurement of depth to water and prior to sampling, the well will be purged using <br /> a submersible pump to ensure that the ground water sample is representative of the formation, rather <br /> than water standing in the well casing The well will be purged until 1) a minimum of three casing <br /> volumes is removed from the well, and/or 2) the field-measured ground water parameters pH, <br /> temperature and electrical conductivity have stabilized However, if a well is purged dry prior to <br /> evacuating three casing volumes, a ground water sample will be collected following 80 percent <br /> recovery of ground water level within the well or within 8-hours of well evacuation <br /> Purge water, free-product, and decontamination water generated during the ground water sampling <br /> activities will be contained in DOT-approved drums which will be appropriately labeled for storage <br /> Drums containing purge water will be stored on-site pending appropriate removal and disposal <br /> 4 2 3 Sample Withdrawal <br /> Water samples will be collected from the monitoring wells using disposable polyethylene bailer <br /> These bailers are disposed of after one use and require no decontaminating,thereby minimizing cross <br /> contamination due to sampling devices Samples will be drawn and collected in such a mariner that <br /> agitation and exposure of the groundwater to the atmosphere is minimal Sample containers will be <br /> filled using the appropnate disposable sampling attachment which allows controlled flow out of the <br /> bottom of the bailer by lifting up on the check valve <br /> Advanced CeoEn%ironmenial,Inc <br />