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i <br /> FIELD METHODS AND PROCEDURES <br /> ' 1.0 GROUND WATER AND LI UID-PHASE PETROLEUM HYDROCARBON <br /> DEPTH ASSESSMENT <br /> A water/petroleum product interface probe was used to measure liquid-phase petroleum hydrocarbon(LPH) <br /> thickness and ground water depth in each well If an LPH layer was not observed by the interface probe,the <br /> rtip of the probe was subjectively analyzed for a sheen All measurements and physical observations were <br /> then recorded on separate data sheets in the field <br /> 2.0 SUBJECTIVE ANALYSIS OF GROUND WATER <br /> ' Prior to the purging of ground water monitoring wells, a water sample was collected from the monitoring <br /> well for subjective analysis The sample was retrieved by gently lowering a clean disposable bailer <br /> ' approximately one-half the bailer length past the air/liquid interface The bailer was then retrieved and the <br /> sample contained within the bailer was examined for liquid-phase petroleum hydrocarbons <br /> 1 <br /> 3 0 MONITORING WELL DEVELOPMENT PURGING AND SAMPLING <br /> ' Monitoring wells were purged of at least three well casing volumes and sampled using new disposable <br /> bailers Ground water purged from the wells was stored in 55-gallon barrels at the site The barrels were <br /> labeled with corresponding monitoring well numbers and date of purging The purge water is removed <br /> from the drums using a vacuum truck and transported to a permitted facility for disposal After purging, <br /> ' ground water levels were allowed to stabilize Samples were collected in au--tight vials, appropriately <br /> labeled and stored on ice from the time of collection through the time of delivery to the laboratory A <br /> chain-of-custody form was completed to ensure sample mtegnty Ground water samples were transported <br /> to the laboratory and analyzed within the EPA-specified holding times for the requested analyses <br /> 1 <br /> r <br /> 1 <br /> r <br /> LRP002 865 <br /> r <br />