ARCHIVED REPORTS_2010_20 - Laserfiche WebLink

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1. Thd pH, conduct.ivity, and turbidity 'meters will be calibrated at a minimum at the beg'nag of each sampling day using comm"afly obtained standards- Calibration, will R e checked two to thrm times during the daytoevaluate the potential that the callbrafion is drifting throughout the day. - If instrument dxift a is the ficjd, the raeasurernc= iaken during pm -ging ind sampling will b4 i4justed accordingly. Example calibration logs are included in Apriendix*C. Dtiring purginga�nd sampr;ng of the wells the instruments will be used in the same manner as driting calibration. 2. Depth to water wUl be measured again, Prior to =Wft. ia each well as d��bed in Section 4.4.1 and recorded on the Purge fir. .aa t.cranio n, and Sample Log. The -volume of groundwater in the well casing will be calcuLated using the Bollowing equation(s): 44i7ch well-- 'Well Depth fiorr. the mark on the well casing (ft)'- DTW (ft)) x 0-653 gaVfL Prioi to pur&g, the- vrater, wiM be7-exadiimed-by- using -a di�posable-baflcr that is clear - enough to see ffirougfi. Features such as iziimiscible lay= will be noted and -measure& immiscible layers arcobserved the -wa will not be purged prior to samplirg, 4-- The well will then be purged using the-p=Zepump&.:Due to the -fact that the punirys must purge water from depths as great 3s�70 to 80 fcet below ground surfac,,,- pe esm e tigat r rng fi-om .114 to I gaon per minate. 1 bis - purge rate does not appear to exceed the recharge of the Wea - Purge water will be discharged to -the ground (.see Section Dtpth to water will be tak= pedodically dudng purging. 'The purposeof these measurtments is to monitor -,dmwdovm If a d=J= in groundwater elevation is noted, the purge rate will be decrcasi«d until equidum (purge rate equals recliarge raw) is achieved. -f he fitqu=cy of zne==inent will be -once every fly -e minutes initially decreasing to once. everyone-bWhour once oquilibritim has been reached. If equbrium cannot be reached, it will be necessary to purge the wa to d7=7— Purge'. uatil 1= than 101% of the original volume of water t=ains in the well. Hand baWmg =y be .•r !i to ined dds objective. Monitor the DTW every 15 minutes to evaluate recharge. Stat sample collection wh�n either two fed of waW has filled the well or 1.75 hours has elapsed since dm end of purgiugCollect volatile organics no iota ffian two ho =** after purging. Record all actions and measurements amciated with pur.giq a well dry on'the Purge Mr_ aerizadon and S . ample Log. MIMEO&I