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• GROUNDWATER MONITORING AND SAMPLING PROCEDURES <br /> ' Groundwater Depth Measurements <br /> Groundwater depth measurements were obtained at each groundwater monitoring well using a HeronTM <br /> ' water level indicator Groundwater depth measurements were recorded from the surveyed mark that is <br /> typically on the north side of the top of the uncapped PVC well casing Measurements were recorded to <br /> ' the nearest 0 01-foot by the technician on a field data sheet along with the measurement time The <br /> groundwater elevation in each well was calculated by subtracting the measured depth to groundwater <br /> from the surveyed wellhead elevation established at the designated measuring point on the top of the each <br /> PVC monitoring well casing <br /> The water level indicator was decontaminated prior to arrival at the site and between measurements at <br /> ' each groundwater monitoring well Decontamination procedures include washing the probe with a non- <br /> phosphate detergent(Alconox®) followed by rinsing with tap water <br /> ' • Groundwater Dissolved Oxygen Measurements <br /> Groundwater dissolved oxygen measurements were obtained at each groundwater monitoring well using <br /> the YSl-85 dissolved oxygen probe The probe was decontaminated before and after taking a <br /> measurement at a well Measurements were taken by lowering the probe approximately two to five feet <br /> into groundwater The measurement was taken when the reading stabilized The measurement was <br /> recorded on the field data sheet with the depth to groundwater measurements <br />— - — --- Groundwater Purging - - ---- -- - - - - -- --- ---- -- <br /> Based on the groundwater level and the total depth of the well, the volume of water to be purged from the <br /> well was calculated before purging began Approximately three well volumes of water were purged from <br /> ' each monitor well casing prior to sampling Groundwater was purged from the wells by pumping <br /> During this sampling event, a 15"ProActyve "Mini-Monsoon" submersible pump was utilized to remove <br /> the necessary water from the well casings The pump is operated with a 12-volt car battery The pump <br /> was decontaminated before and after use at each well location with a liquid detergent wash(Liquinox®), <br /> and tap water rinse <br /> 1 <br />