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BV = (7 4814) x (CD2-,P (BD2-CD) 2) x (WD-GW) <br /> BV borehole N olume (gallons) BD borehole diameter (feet) <br /> CD casing diameter (feet) WD Nell depth (feet) <br /> GW depth to groundwater (feet) P porosity of the gra-,el pact. 25% <br /> Table of Common Boring and Casing Diameters <br /> Boring Casing Volume 3 VolumesX (WD-GW) <br /> diameter diameter gallons/ foot gallons /foot <br /> inches inches <br /> 4 1 0 042 0 126 <br /> 6 1 0 082 0 246 <br /> 6 ? 0 173 0 519 <br /> 8 2 0 277 0 831 <br /> 8 - 4 0671 2013 <br /> 10 2 0 572 1 716 <br /> 10 4 0 844 2 532 <br /> F_XAMPLE An 8 inch boring v ith 2 inch casing requires removal of 0 831 gallons of <br /> ater per foot of ,vater column <br /> The water collected during purging is either safely stored on- site in 55 gallon DOT 17H <br /> drums for later disposition, transported to an approved on-site/off-site treatment facility <br /> or to a se«=er discharge system <br /> COLLECTION OF WATER SAMPLE FOR ANALYSIS <br /> The ground,,N ater in the well is allowed to recover to at least 80% of its �,olume prior to <br /> purging, if practical before the ground% ater sample is collected <br /> Percent Recovery = 0 - Residual dra«down) x 100 <br /> Maximum drawdoNvn <br /> a fiesh bailer is used to collect ei10u2l, eater for the requirements of the laborator-, for <br /> er into <br /> the analyses needed or required The water samplescontainers are decanted furnisheld preilcleanedtlto <br /> appropriate number and size containers These the anal 'tical laboratory <br /> exact EPA protocols, with and without preservatives es added, by } <br /> or a chemical supply company The bottles are filled, ,Nith no headspace, and then <br /> capped with plastic caps with teflon liners <br /> The vials or bottles containing the groundwater samples are labeled with site name, <br /> station, date, time, sampler, and analyses to be performed, and documented on a chain of <br /> , <br />