ARCHIVED REPORTS XR0012745 - Laserfiche WebLink

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1.0 .GROUND WATER AND FREE-FLOATING PRODUCT'T)EP"T H DFTERhiTNATTON A water/petroleum product interface probe was used to determine the free product thickness,if present, and a water level indicator was used to measure the ground water depth in monitoring wells that do not contain free product. Depth to ground water was measured from the top of each monitoring well casing. The tip of the water level indicator was subjectively analyzed for product sheen. All { measurements and physical observations were then recorded in the field in separate data sheets 1 presented in Enclosure B. 2.0 SUBJECTIVE CCTVE ANALYSTS OF GROUND WATER Prior to purging,a water sample was collected from the monitoring well for subjective analysis. The sample was retrieved by gently lowering a clean,disposable bailer to approximately one-half the bailer length past the air/liquid interface. The bailer was then retrieved,and the sample contained within the bailer was examined for floating product and the appearance of a petroleum product sheen. 3.0 MONITORING WELL DQE-LOPMENT,pURGTNG ANT-SAMPLING Monitoring wells were purged of three to four well volumes of water ruing a centrifugal pump or bailer. Ground water removed from the wells was stored in 55-gallon barrels at the site. The barrels were labeled with corresponding monitoring well numbers and the date of purging. After purging,ground water levels were allowed to stabilize. A ground water sample Has then removed from each of the wells using a disposable bailer. if the well was purged dry, it was allowed to sufficiently recharge and a sample was collected. Samples were collected in air-tight vials,appropriately labeled,and stored on ice from the time of collection through the time of delivery to the laboratory. A chain-of-custody form was completed to ensure sample integrity. Ground water samples were transported to the laboratory and analyzed within the EPA-specified holding times for the requested analyses. Purge water will be collected from the storage barrels in a vacuum truck and transported to an appropriate facility for treatment and/or disposal.