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IN <br /> c w ay - w <br /> a :r `-. Y ro�y �r v�c "'r "�✓ v r� x r y1k e a <br /> 4 .•+4". 5. uh 'F.w'Yy. 'F'.' ..,�.4 �']'�:r.. �. Fy wY .i..?. x' ':iT ?'V1�.�, -�'$ ;.bs � .'F'Y"T`�ar f' j'S y rb.;t-� <br /> h <br /> E' <br /> S <br /> FIELD PRCaMMURES <br /> The following section describes field procedures that were completed by Delta personnel in the <br /> performance of the tasks.involvad with this project. <br /> LO SUB ECTIVF,ANALYSIS OF GROUND WATER <br /> Prior to purging of ground water rmanitoring wells,a water sample was collected from each monitoring <br /> wail for subjective analysis. The retrieving of the sample involved gently Iowering a clean,disposable, <br /> Teflon bailer to approximately one-half the bailer length past the air/liquid interface. The bailer was <br /> then retr aved,and the sample contained within the bailer was examined for floating product levels and <br /> appearance of a petroleum prodact sheen. <br /> 2.0 GROUND WATER AND FREF.-FI.OATING PRODUOf DEPTH DETERhlINATION <br /> A water/petroleum product interface probe was used to determine free product thickness and around <br /> i <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 fur product sheen. <br /> 3,0 1VlONITORlN('.WELL DEifFLnPIVIENT.PURGING.AND SAMPLING <br /> I <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 <br /> barrels were labeled with corresponding 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 <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 of collection through the time of delivery ! <br /> to the laboratory. A chain-of-custody form was completed to ensure sample integrity. Groundwater <br /> samples were transported to the Iaboratory and analyzed within the EPA-specified holding times for the <br /> requested analyses. <br /> z <br /> s <br />