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` - <br /> .[5,��- +,xe. �+�,.t.-p ,:w�.�— F �iF �r �;F- ,�,�, 5k•:i+F.. f � -i.,.•.,-•:y�'' y,..':'jt ��"i9!. j *5.1.r'g"'_�%� . i <br /> ,�i� •,'"' ;.R �.��' „N• �P 'xY';��n�' i�w,r-; �.'N,�`i;, �: :S'�i s "�� r-J � c xq.+� w �;,. s^-.a .�k`w. =�.i. � -`.,:LL,. ^w9r 'tYy <br /> N" <br /> FIFI.y7 PP.00FDURF.S <br /> The following section describes field procedures that were completed by Delta persortnel in the <br /> performance of the tasks involved with this project. <br /> IA 5I113 FCL LVF ANAY YSi�OF GROUND V�'ATER <br /> Prior to purging of ground rater monitoring wells,a water sample was collected from each monitoring <br /> W211 for sabjecr,ive 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 fur floating product levels, <br /> appearance of.'a petroleum product sheen,and any detectable petroleum product odor. <br /> 2.0 GROilNI1 NATER AND FREF.FLOAT.NG PRODUCT I)EVn1 DF;FERMINATION <br /> A waterlpetroieum 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 analyred for product sheen or detectable odor. <br /> 3.(t 7IONITtI ING Vt ELL.1?F,VEI.OPMFNT PURGLNG AND SAMPLING <br /> Monitoring wells v,ere purged using a centrifugal pump capable of producing approximatal)'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 purF:ng. Purge water will <br /> be collected from the storage barrels in a vacuum tank and transported to sin appropriate facility for <br /> treatment andlor disposal. After purging,ground water levels were allowed to stabilize. A xarcr 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 /> sa;nplcs were¢ransported to the laboratory and analyzed within the EPA-specified holding tiracs for the <br /> requested analyses. <br /> x: <br /> f <br /> gip.: <br />