ARCHIVED REPORTS_2009_12 - Laserfiche WebLink

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1. The pK conductivity, and turbidity meters will be calibrated at a minimum at the beginning of each sampling day using commemially obtained.'standards. Calibration,will be checked two to dart times during the day to evaluate the potential that the calibration is drifting throughout the day. -If instrurnent drift is detected in the field, the measurements taken during p: and sampling will be adjusted accordingly, Example calibration Iogs are included in.Applin . purging and sampling of the wells the dents will be used m the a manner as&rbg ca1Indon. 2. Depth to water will be measured again, 'or to sampling, in each well as descn'bed in Section 4.4.1 and recorded on the Purge Oaracterizatioa and Sample Log. The volume of groundwater in the well casing will be calculated using the following equation(s): flinch well: (Total Well Depth from the mark on the well casing (ft} - DTW (ft)} x 0.653 ga1/i3_ 3_' Pricer to purging, the waze:r wil be. by-using a.d'tsgosabIc'bailer that is clear- c=ough to sex through- Features such as immiscible lay= will be noted and Measured_ If immiscible layers-arc observed the well will not be purged prior to sampling- .,. - - . i - 4_ The welt will then be purged using the-purge .Due to the-fact that the pumps must purge water from depths as great as70 to 80 feet below ground swfac cy puirge rates range from U4 to I gallon per minute This•p e pate does not appear to exceed the recharge - rates- of the wells. Purge water wilt be discharged to-the ground (see Section 4.4.6)_ to water measurcrue=will be taken periodically during pig. The purpose of these measuxrecueuts is to monitor-drawdown. If a demise in groundwater elevation is .noted,the purge rate will be d=eased until equillbriurn(purge rate a quids rr cbarge rate) is achieved. The frequency of measm=ent will be-once cvecry five minutes initially decreasing to once every one-half hour o has bees reaehaL If equilibrium cannot be reached,it will be to purge the well to dryness. Furgc until less than 100/4 of the original -volume of water;=zins in the well, Hand batting may be required to med this objextzve. Monitor the DTW every 15 minutes to evaluate recharge. Start sample collection viben dther two feet of water has filled the well or 1.75 boors has elapsed since the end ofpuzZing. CoUed volatile organics no later than two hours after purging. Record all actions and mmurema=associated with purging a we11. dry on the Purge Charactctii on and Sample Log. - 444-FO IU31 OR325 A•7 July 14,2000 24401Ckiahtdec.�ac, .