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The pH. conductivity, and wrrity 'Meters wUl be calibrated at a minimura at <br />beginning of each smpHng day using commemially obv&ed'sianduds. calibiati. <br />be checked two to thize times during the day to ewluate the potential that th, <br />a' <br />'a <br />callbra4t <br />'i j <br />Inen durng Pugm o. <br />is driffing throughout the dAy, -If iast=ent ddft is detected in the fiejd, tb <br />iqd smpfing wM be idjusted accordit4y. Exampi <br />ewuremeqts iakir <br />calibration logs am included In Apj�wdlx'C During pur-ging and uii! ling of the <br />the instruments will be used in the same manner as during cafilration. <br />2. Depth to water will be measurednp, or o =qAM i <br />agm, nt <br />is each'descri as Ixd in <br />..S . ection. 4,4.1 and recorded on the Purge.Characterizationand Sample Log. The volume <br />,of groundwater in the well au�ffig will be calculated using the following equation(s): <br />4-4inch welL * (Total Well Depth ficm the mark on the well c•asing - - - DTW (ft)) x <br />00 <br />L653 gal/fL <br />PriOiW purging, the-vratervd'M be%exard nc&-by-using-a_di'"sable-bancr&a iS C14=r- <br />mough to see through- Feaftw= such as immiscible laY= will be noted and -measure& <br />..If immiscible lay= are observed the w,!I-1 Will not be purged prior to .;us i' <br />The well Will then be purged using the -purge pumps_ •Due to the fact that the purr;ps must <br />4- <br />1purige vMter from depths as great as- 70 id 80 feet below ground surfacr,,. pukge rates range <br />firoln 1/4 to I gallon per minut e- This -Purgt rate does not. appear to exceed the rcchazZe <br />'ratcs.,of the wells� Purge waterwill be discharged to -the ground (see Sectian 4.4.6)_ <br />Depth to vrater it ++: will be taken periodically dudag purging. -The purposcof <br />Ome measurements is to Monitor Ammdown- ff a dca�ase in' groundwater cicvadon is <br />moted. the purge r -ate will be decreased, until r[ ti (purge rate equals =cbqZc rate) <br />is zcWeved. 7he frequency of measurement will be -once vetg five nifimtes initially <br />decreasing to once every one-balfhour once equffibdum has been reached. <br />If equbrium cannot be reached, it will be necessary to purge the Well to dryne�-7- <br />Until less tbian I (r/a of the od&A volume of water remains in the welL Hand ban <br />nmy be requh-W to med this obji6dvc, Monitor the DTW every 15 minutes to <br />to <br />d <br />evs <br />T=harge. Start santple collection vk;n efffier two fed of water has filled the well -or- I 1� <br />hours has elapsed sfi= dm end of purging. Colled voWe organics no later thm <br />hou*xs' after mi an <br />.8 0". , ".. "N I W roll M, <br />• <br />A-7 <br />fitly 14, 2000 <br />