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_ <br /> N <br /> _ <br /> 'id7>.^>n.J �+l 4i»..' .l *•h-fis� <br /> L �;{ :r•. 'w^u�. ..' �`^ A .-F�-,`�"W;.. 'a.r� ,r'-u2 S%'.. <s � Q'�,u -xr.,-.. ,ws�7r�'�`�""e- �J.., � r r ,�',' r""-';��"d�+s <br /> ' : - :w. ,� j� ."":,6,',�+� _ �r r ��'�.. '�, ;,� ^sy'�. [G - ��r ,w�'�.:��.e-.',,.�_ .,:�' ,.: ,ems"qm•�•M..''e:': ��.. •?�,� � � .�. '�, :"`�,� :d�; <br /> ffi <br /> FIELD PROCEDURES <br /> The Following section describes field procedures that were completed by Delta personnel in the <br /> performance of 4he tasks involved with this project. <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 /> 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 and <br /> appearance of a petroleum product sheen. <br /> 10 GROUND WATER ANTI FREE-FLOATING PRODUCT DEPTIL DI I ERMLNATION <br /> A water/petroleum product interface p,oDe 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. <br /> 3.0 MONITORING WELT.DWFLOPMENT 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 <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. Ground water <br /> samples were transported to the laboratory and analyzed within the EPA-specified holding times for the <br /> requested a,,alyscs, <br />