ARCHIVED REPORTS_2013_6 - Laserfiche WebLink

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1. The pH, conductivity, and turbidity meters will be calibrated at a minimum at the beginning of each sampling day using commercially obtained. standards. Calibration Will be checked two to tlu= times during the day to evaluate the potential that the calibration is drifting throughout the day. - If instrument drift is detected in the field, the- measurements hemeasurements taken during pur&g and sampling will be adjusted accordingly. Example calibration logs are included in .Appendix ' C.. During purZing and sampling of the wells the instruments will be used in the same manner as during calibration. 2. Depth to water will be measured again, prior to sampling, in each well as described in Section 4.4.1 and recorded on the Purge Characterisation. and Sample Log. The volume of groundwater in the well casing will be calculated using the following equation(s): 4 -inch well- ' (I 6tal Well Depth f x= the mark on the well casing (ft)-- D -TW (ft)) x 0.653 gal/fL • • to ♦ r r. 9 • the -water,■ ra R/. • r using i i • w clear-7- ,en4ough toseethrough- Featzes1asimmisciblein V noted ..f • •! ..r i rt& mutil •c layers-areobserved the Y • be • t • e• prior to v ti • t 4- Ihe weH wWthen be purged 1 ■ the -purge■ tU i to f! • .tthepurnps tnust purge water from depths as great a;T 70 -to 80 feet below ground surfacc� plirge rates range fmm 1/4 to I gafl-on per zmTmute- Tbis-purge rate does not appear to exceed the recharge of at Purge . • .• be discharged to-theground(.see, Section s Depth towater measurmnents wffl be taken •r9 t. w • e r during r n _J e 1 purposeof fliesemea==entst++• monitor -drawdown. a « .r. in _J. t Y. ■ s w.. .1i •. f is noted, i " purge .f will be d=e/.sed !tt 1 equilibrium (purge . k • etate;./ Y.'recharge is achieved. : 7 ficquencyof measurement Y-onceevery Eyeminutes inidany decreasing • once once -half :f r t once e• • ib• has • +.1/ reached. If equilibrium r.a••.: be reached, it will be necessw to purge t to drynes& Purge until ... than F' of / original v• t1! of ..r ;=ains in;=ail theHand bailing may bee required to t/ + this • • «! Monitor !e DIV every 15 minutes to crahwe "' i. 'ge Startsampler•1..«•.•t `.R..1 a.U.r ' ♦ .w ofwater hasfilled the well or 1.75 hourshas .p ..• since the.+t • of purging. Collectvolatileorganics i • later than • t hot=- # 7 .1: purging. R +«• fall actionsand 11 +•: 1 MI! .vt 1. associated w i. p! 1 i. t + well dry on'the Purge Characterization and S I ample Log. 1 23-483949-R IU31 OR325 A•1 2M KkW4dm lac. July 14, 2000 Q