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` <br /> MOO <br /> I <br /> � I <br /> FIELD PROCEDURFS <br /> The following section describes field procedures that were completed by Delta personnel in the <br /> performance of the!asks involved with this project- <br /> Eli 1.0 SUl3 F.CTIVF ANALYSIS OF GROUND NATER <br /> Prior to purging of ground water monitoring wells,a water sample was collected from each monitoring <br /> well for subjective analysis. The retrieving of the sample involved gently lowering a clean,disposable, <br /> Teflon bailer to approximately one-half the bailer length past the air/liquid interface. The bailer was <br /> then retrieved,and the sample contained within the bailer was examined for floating product levels, <br /> appearance of a petroleum product sheen,and,any detectable petroleum product odor. <br /> 2.0 GROUND WATER AND FREE-FLOATING PRODUCT DEPTII DETERMINATION <br /> A water/petroleum product interface probe was used to determine free product thickness and ground <br /> water depth in each well. If a free-floating product layer was not detected by the interface probe, the <br /> tip of the probe was subjectively analyzed for product sheen or detectable odor. <br /> 3.0 MONITORING WELL DEVELOPMENT PURGING AND SAMPLING <br /> Monitoring wells were purgd using a centrifugal pump capable of producing approximately 5 gallons <br /> per minute. Ground water removed from the wells vrns stored in 55-gallon barrels at the site. The <br /> barrels were labeled with corresponding monitoring well number and date or purging. Purge water will <br /> be collected from the storage barrel in a vacuum tank and transported to an appropriate facility for <br /> treatment and/or disposal. After purging,ground water levels were allowed to stabilize. A water sample <br /> was than removed from each of the wells by use of a Teflon bailer, Samples were collected in air-tight <br /> vials appropriately labeled and stored on ice from the time of collection through the time of delivery <br /> to the laboratory. A chain-of-custody form was completed to ensure sample integrity. Ground water <br /> samples were transported to the laboratory and analyzed within the EPA-specified holding times for the <br /> requested analyses. <br /> i <br />