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' k <br /> FIELD PROCEDURFS <br /> The following section describes field procedures that were completed by Delta personnel in the <br /> performance of the tasks involved with this project. <br /> • is <br /> 1.0 SUBJECTIVE ANALYSIS OF GROUND WATER <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 /> 'i <br /> Teflon bailer to approximately ane-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 and <br /> appearance of a petroleum product sheen. <br /> r•i <br /> r; <br /> 2.0 GROUND WATER AND FREE-FLOATING PRODUCT IIEPTIf DETERMINATION <br /> A water/petroleum product interface probe was used to determine free product thickness and ground <br /> r <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. <br /> i <br /> 3.0 MONITORING WELL DFVF.I,OPMENT PURGING; AND SAMPLING <br /> Monitoring wells were purged using a centrifugal pump capable of producing approximately 5 gallons <br /> per minute. Ground water removed from the wells was stored in 55-gallon barrels at the site. The a <br /> barrels were Iabeled with corresp r.ding monitoring well number and date or purging. Purge water will ; <br /> be collected from the storage barrels in a vacuum tank and transported to an appropriate facility for `4 <br /> treatment and/or disposal. After purging,ground water levels were allowed to stabilize. A water sample <br /> was then 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 Gf collection through the time of delivery j <br /> to the laboratory. Achain-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. j <br /> r <br /> 4 <br /> .1 <br /> :R�7RAl�Al1 <br />