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t� k '.j 1 Y ,5 k YYS ht .g3tE 7 S <br /> l_yP <br /> 4 12 February'.1999 <br /> AGE NC Project No` 98_05401' <br /> s,. <br /> . Page 7 of 8,�: <br /> - <br /> - <br /> 4.4.1 ` Static Water Level Measurements_ 3 <br /> { <br /> x Before`sampling and during quarterly groundwatermomtoring, static water level,wrll be measured <br /> l using an electric water level`indicator Water level data-will be recorded to the neazest 0 Ol foot <br /> 1 4 from a reference point mazked of the top=of the PVC well ca_smg Before and after each:use, the <br /> f measurement device will be rinsed`.with`.water x <br /> r _•;i x f' 'f 2 x <br /> r <br /> 4:4. <br /> 2Well Evacuation r' <br />' r < Subsequent to measurement of depth to water and pnor to sampling, the well will be purged usingYr , <br /> s a two-stage submersible pump to ensure that the sample-is representafive of ilia-formation, rather;= <br /> �• j, than water standing in the welI'c`asmg The well will be'purged until 1.),-a minimum of three casing' <br /> volumes';is removed;:from,the well;=and%2) the .field=measured ground water parameters <br /> stabilized:However,if.a welLis purged dryprior to evacuating three casing volumes, a ground water <br /> y sample will-be collected following 80 percent recoveryofground water-within the well or°within 8 ' <br /> hours of well evacuation., <br /> y3 <br /> l 4.43 Sample Withdrawal <br /> t , Water samples will be collected from th--E in toiing well using a disposable polyethylene bailer. <br /> These bailers are disposed of after one use and require.no decontaminating,therefore mimmliing <br /> cross.contamination due to 'sampling devices TSamples will be drawn and collected in such a manner 3 J <br /> , that agitation and exposureof the groundwater to-the atmosphere is minimal Sample containers will T <br /> be filled using the.appropriate disposable sampling attachment which allows controlled flow out of <br /> the bottom of the bailer by lifting up on the check_valve -- <br /> i <br /> .. r t 4� s <br /> 444.-- Sample Handling <br /> 1 '4 , Ground water samples:wlll be collected roto laboratory supplied containers Ground wateYsamples_ <br /> + for BTEX;TPH-g and fuel oxygenate analyses will be collected info•40 ml VOA vials contain t i - <br /> 0.5 ml of hydrochloric"acrd as preservative Following collection the samples will be placed on`ice <br /> and kept ri a cooler until delivered to the'laboratory for analysis Chain of custody protocols <br /> be used to document sample custody transfer from the field to the analytical laboratory A chain of . <br /> custody form will accompany the samples z , <br /> i . Before sampling and dunng,quarter1. groundwater;monrtonng static-water level will be_measured ; <br /> using an.electnc water level indicator Water-level data will be recorded to the neazest;9 O1 foot;: <br /> :: i � C f :- ri e <br /> .} " ' 5 ' a ,••, c fA Advanced GcoEnvironmental Inc e <br /> Y <br /> i <br /> , <br /> y. <br /> a - ... .. � - <br />