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In the case of the non-dedicated putrT, it is lowered into the well and then activate, <br /> (power from -the controller box is regulated which co <br /> ntrots the disclune, rate of the } <br /> 'CeaaffigAl purge.ptuap), In the case of a well with a dedicated'ptunp, the pneumafic <br /> controller box is cannected to the dedicated pump (some WeM have speeW <br /> high-rate • <br /> purge PUMPS only for p ° g, these can be Identified by the fitthatgs on the cap). A <br /> dedicated discharge tube (kept locked at the well head in a protective <br /> Is then <br /> attached to the discharge fitting on the casing cap. The Controller Is txuued on acid <br /> adjusted to reach the desired purge rate. <br /> Note: In all cases WhCre gasoline powered generator ar cotapressvrs arc used, they are to <br /> be placed at least ten feet downwind of the well being sainplyd, <br /> �• <br /> During purging,field parameters(PH, electrical conductivity, turbidity, and tempt) <br /> will be monitored. Parameter measux=Mts will be recorded on Purge and Sargple Logs_ <br /> In addition field obsexvatiorts also will be nm&and recorded.an the Forge and Sande- <br /> Logs. Stich observations includeflow rateswolamc•purg color,odor,bubbling orauy <br /> ®thea°�noanachy table observations_ An example of a Purge Characterh2SOn and Sam <br /> gle Log is <br /> 'Gil. t <br /> 6• g, vAll:contimte until stable Parameter Teadingsare obtaitr«I_ <br /> }]H is considered <br /> stable if the readings do,not vary by greater than 0.1 pH unit TcMP=tu=1S considercd <br /> :'table if it does not vary by more that one degreeCelsius. Conductivity and turbidity are <br /> considered stable if they do not vary by greater than -IOV, Field P;Xraxuet=.wM be <br /> -repeated at apprwdmata five gallon intervals- A minimum of duee well vohxmcs of water - <br /> VM be removed from each well_ The final,stable,valves will be xecorded to be used in - <br /> ttie arzztual - . <br /> Sample Collection <br /> Samples will:be collected as soon as Possible after Purging is cdmPteted. Li ry-supplied <br /> Contfiners will be used to bold the,wata samples- Samples to be analyzed for volatile-organic <br /> constitEimus will.be collected first Depending on.the well, samples ww be collected•with either <br /> dediCated pumps or disposable baffers (a new factory bacner will be used at each well). <br /> Ia.ibe. case of dedicated ted pumps, the pump rate will be afiusted so that the sataPle wi11 not be <br /> as it is coli In le bottles. When ballers are. � used, they will be lowered slowly <br /> W10 the well so not to disturb the water. The sample will be decanted into the bottles slowly with <br /> M349-FO1123l oitm A4 -` <br /> q J*1d,2000 <br /> wW XkIaM4a,�i y�_ <br />