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1 <br /> GROUNDWATER MONITORING AND SAMPLING PROCEDURES <br /> 1 <br /> ' Groundwater Depth Measurements <br /> Groundwater depth measurements were obtained at each groundwater monitoring well using a Heron TM <br /> ' oil/water interface probe Groundwater depth measurements were recorded from the surveyed mark that <br /> is typically on the north side of the top of the uncapped PVC well casing Measurements were recorded <br /> ' to 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 interfacerobe was decontaminated aminated prior to arrival at the site and between measurements at each <br /> ' groundwater monitoring well Decontamination procedures include washing the probe with a non- <br /> phosphate detergent(Liquinox®) followed by rinsing with tap water <br /> • Groundwater Dissolved Oxygen Measurements <br /> ' Groundwater parameters were measured at each groundwater monitoring well using the YSI-85 dissolved <br /> oxygen probe The YSI-85 DO probe measures dissolved oxygen, conductivity, specific conductance, <br /> ' salinity, and temperature The probe was decontaminated before and after taking a measurement at a <br /> well Measurements were taken by lowering the probe into groundwater, then raising and lowering the <br /> probe throughout approximately one foot of water until the readings stabilize The measurements were <br /> ' recorded on the field data sheet with the depth to groundwater measurements <br /> ' Groundwater Purging <br /> The volume of water to be purged from each well was calculated based on the groundwater level and the <br /> ' total depth of the well Approximately three well volumes of water were purged from each monitor well <br /> casing prior to sampling Groundwater was purged from the wells by pumping with a 1 5" ProActive <br /> "Mini-Monsoon" 12v battery-operated submersible pump The pump was decontaminated before and <br /> after use at each well location with a liquid detergent wash (Liqumox®), and tap water rinse During <br /> ' purging, periodic groundwater parameter readings were recorded onto the groundwater sampling data <br /> sheet These groundwater parameters included dissolved oxygen, conductivity, salinity, and temperature <br /> 1 1 <br />