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. GROUNDWATER MONITORING AND SAMPLING PROCEDURES Groundwater Depth Measurements Groundwater depth measurements were obtained at each groundwater monitoring well using a HeronTM water level indicator Groundwater depth measurements were recorded from the surveyed mark that is typically on the north side of the top of the uncapped PVC well casing Measurements were recorded to the nearest 0 01-foot by the technician on a field data sheet along with the measurement time The groundwater elevation in each well was calculated by subtracting the measured depth to groundwater from the surveyed wellhead elevation established at the designated measuring point on the top of the each PVC monitoring well casing The water level indicator was decontaminated prior to arrival at the site and between measurements at each groundwater monitoring well Decontamination procedures include washing the probe with a non- phosphate detergent(Alconox®) followed by rinsing with tap water Groundwater Dissolved Oxygen Measurements Groundwater parameters were measured at each groundwater monitoring well using the YSI-85 dissolved oxygen probe The YSI-85 DO probe measures dissolved oxygen, conductivity, specific conductance, salinity, and temperature The probe was decontaminated before and after taking a measurement at a well Measurements were taken by lowering the probe into groundwater, then raising and lowering the probe throughout approximately one foot of water until the readings stabilize The measurements were recorded on the field data sheet with the depth to groundwater measurements Groundwater Purging The volume of water to be purged from each well was calculated based on the groundwater level and the ' total depth of the well Approximately three well volumes of water were purged from each monitor well casing prior to sampling Groundwater was purged from the wells by pumping with a 15" ProActive ' "Mini-Monsoon" 12v battery-operated submersible pump The pump was decontaminated before and after use at each well location with a liquid detergent wash(Liquinox®), and tap water rinse 1 During purging, periodic groundwater parameter readings were recorded onto the groundwater sampling . data sheet These groundwater parameters included dissolved oxygen, conductivity, salinity, and ' 1