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A-1 <br /> 1.0 GPOtJTti1 W_ATF <br /> R AND FRFF--FI.t]ATTNG PRQDUC D1;PT I DFT1 i�MINATi0 <br /> r <br /> A water/petroleum product interface probe was used to determine the free product thickness.if present,and <br /> a water level indicator was used to measure the ground water depth in monitoring wells that do not contain <br /> free product. Depth to groundwater was measured from the top of the monitoring well casing,which has <br /> been sur-eyed to within 0.01400t relative to the City of Lodi bench:nark with an elevation 51.70 feet above <br /> mean sea level,(Figure 2). The tip of the water level indicator was subjectively analyzed for product sheen. <br /> All measurements and physical observations were recorded in the field on separate data slicers presented <br /> in Enclosure B. <br /> 2.0 SllR FCT M,AN IMIS OF CPO UNR-WATER <br /> Prior to purging a water sample was collected from the monitoring welts for subjective analysis. The sample <br /> was retrieved by gently lowering a clean,disposable baiter to approximately ol.e-half the bailer length past <br /> the air/liquid interface. The bailer was then retrieved,and the sample contained within the bailer was <br /> examined for floating product and the appearance of a petroleum product sheen. <br /> 3.0%40NTTORING WELL DM. -LOPMENT P1JR0NG ANA SAMPL'NG <br /> Monitoring wells were purged of three to four well volumes of water using a centrifugal pump or bailer. <br /> Ground water removed from the wells was stored ir,"55-gallon barrels at the site. The barrels were cabeled <br /> with corresponding monitoring well numbers and the date of purging. After purging,ground water levels <br /> were allowed to stabilize. A water sample was then removed form each of the-wells using a disposable <br /> hailer. If tfe well was purged dry, it w?s allowed to sufficiently recharge and a sample was collected- <br /> Samples werocollected in air-tight vials,appropriately lalfeie3,and stored on ice from the time of collection r <br /> throagh the time of delivery to the laboratory. A chain-of-custoiy fast was completed to ensure sa nPle <br /> integrity. Ground water samples were transported to the labarator0 and analyzed within the EPA-specified <br /> holding times for the requested analyses. Purge water will be collected from the storage barrels in a vacuum <br /> truck and transported to an appropriate facility for treatment and/or disposal. <br /> LRP00tJDM <br />