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<br />u~ra.o.s s~ r~ rusr~ - ~~ se.~s r+~r <br />' Well Purging Procedures <br />' Wells that contain phase-separated constituenu wiIl not be sampled. <br />Purging of wells is'necessary to remove stagnant water or stratified constituents within the <br />well bore. This removal aDows fresh i;` anon liquid to enter the borehole. In a high yield <br />1 formation (one which caa effidently yield three easiag wlumes of squid) temperature, pH, <br />and conductivity wt11 be monitored during purging. After the removal of three casing <br />' volumes, if temperature, pH, and conductivity have stabtlized, the weII wIIl be sampled. If <br />the parameters have not stabt7aed after three casing whtmes, addition water will be <br />removed until the parameters are suitable. In low-yield wells where three weIl whtmes <br />' cannot be removed effidently, then the weII will be evacuated unb7 nearly done and sampled <br />after sufficient liquid has recovered to obtain a sample. WeIIs that require more than 24 <br />' hours for recovery are considered dry and w11 not be sampled. The following steps w~71 be <br />uttlized for purging. <br />' Purging by Bailer <br /> 1. Batter and other equipment uulized wtll not contact the ground or other <br />' sources of contamination. <br />' 2 At each well, the sampler will use a new pair of nitnle or latex gloves. <br /> 3. At each well, clean poly-propylene rope wt11 be obtained and attached to the <br /> bailer. <br /> 4. The other end of the rope wtll be attached to a surface object that can not fit <br />' inside the wen casing. <br /> S. Lower the batter slowly into the well. Do not agitate fluids contained within <br />' the we1L <br /> (x Allow ffie batter to fill with liquid <br />' <br /> 7. Remove the batter and empty into an appropriate vessel for wlume measure- <br />' menu. <br /> 8. Repeat the procedure for fluid removal untill the aforementional parameters <br /> are obtained (i.e. three wlumes, dry, or Ph, temperature, and conductivity <br />bl <br /> sta <br />e). <br />1 <br />-3- nit tataAz <br /> <br />