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:._. � _;.-.'�^2s .. _- cwtr,. ..t^rs •naw _'�'�. n7"'z, s - '� ti� { s S ..ass�% -_��,_m?�g- '' �`'' �'�� .'�*`,2° f° � z� :ar � _ ��,`�.i.� �"' g n;.¢''s. � aS^, <br /> 10. <br /> snmpte frorn the bnckflll/native uoll Interface or a short dfstnnce below the <br /> Interface. in the cone of tanks lass than 1,000 gallona in capacity, only <br /> one aample from bcnanth tho tank Is required. A chart diatancn lint been <br /> defined by Region 2 Board engineers no not greater than twenty-four inches <br /> below the backfill/nutiva soil interface and Is generally taken to be one <br /> foot below the the backfill/nntivu soil interface. This Roll Is brought up <br /> Mm In the backhoe bucket. A shovel or trowel is used to cut away surface coil <br /> and backfill material which may have been included In the bucket, and the <br /> sample In taken by pushing or driving s brass sample liner into the newly <br /> exposed soli from the designated dapth and location. Additional <br /> clarifications by Region 2 Board engineers have indicated that v�hen thorn is <br /> an obvious difference in the relative contamination of evil brought top from <br /> the Interface depth. then It is the relatively more contaminated soil that <br /> should bu aalected for inclusion In the sample. <br /> SAMPLE CONTAINERS <br /> Our firers uses new sample containers of the type specified by either EPA or <br /> the RWQCl1 for the collection of samples at sites where underground storage <br /> tanks are Involved. Water samplas are contained in 40 rel volatile organic <br /> analysis vials (t;OAs) when analysis for gasoline and similar light volatile <br /> compounds Is Intended. Those containers are prepared according to EPA Sl; 846 <br /> and will contain a small amount of preservative when the analysis Is for TPH <br /> as gasoline or EPA 602. Vials. intended for EPA 601 analysis and EPA 62.1 GCMS <br /> procedures ars not preserved. Closure is accomplished with an open headed <br /> • (syringe accessible) plastic screw cap brought down on top of a 'Teflon faced <br /> septum which is uccd to seal the sample without headspece. <br /> Water samples Intended for semivolatile and nonvolatile analysis such as <br /> total oil and grease (TOG) and diesel (TPH HOP) are collecta.t and transported <br /> in properly prepared new glass liter bottles. Dark amber glass is uxed in <br /> the manu{acture of theta bottles to reduce any adverno effect on the sample <br /> by sunlight. Antimicrobial preservative may be added to the sample liquid if <br /> a prolonged holding time Is expected prior to analysis. closure is <br /> accomplished with a heavy plastic screw cap. <br /> Soil samples for volatile, setalvolatile and nonvolatile ansls•ses are all <br /> collected in properly prepared new brass liners which are 2 inches in <br /> diameter by i inches in length. Closure is accomplished with press fit <br /> plastic end caps which are fitted to the ope;t ands of brass tube after a <br /> sheet of nluminum foil is wrapped over the exposed sample material. A nan- <br /> contributing/nonsubtractive tripe It wrapped completely around the Joint <br /> areas where the plastic caps meet the outer wail of the brass tube. No <br /> preservative other then cold storage Ir used On samples captured in sample <br /> -- eorttairters-t+f this type. -...._ _.._..._. _ <br /> SAHKIE 11NdDLING Pl*CEDIIR$S <br /> Solid sample material Is captured by advancing the liner into the soil. This <br /> may be done by pushing the liner Into soft toile or by contsininif the liner <br /> Sampling Report M55-C-2 CBEVRON 1918 pace 9 <br />