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BV = (7 487r/4) x(CD2+p (BD2-CD) 2) x(WD-GW) <br /> BV borehole volume (gallons) <br /> BD borehole diameter (feet) <br /> CD casing diameter (feet) <br /> WD well depth (feet) <br /> GW depth to groundwater (feet) <br /> P porosity of the gravel pack, 250 <br /> Table of Selected Boring and Casing Diameters <br /> Boring Casing Volume 3 Volumes X (WD-GW) <br /> diameter diameter gallons gallons <br /> inches inches foot <br /> 4 1 0 042 <br /> 6 1 0 082 <br /> 6 2 0 173 <br /> 8 2 0 277 <br /> 8 4 0 671 <br /> 10 2 0 572 <br /> 10 4 0 844 <br /> For a 8 inch boring with 2 inch casing. 0 277 x (WD-GW) x 3 for <br /> three volumes of water in gallons . <br /> The water collected during purging is either safely stored on- <br /> site in 55 gallon DOT 17H drums for later disposition, <br /> transported to an approved on-sate off-site treatment or sewer <br /> discharge system. <br /> Collection of Water Sample for_.Analysis <br /> The well is allowed to recover, to at least 80% of practical, <br /> after purging and a groundwater sample is collected <br /> Percent Recovery = (1 - Residual drawdown) x 100 <br /> Maximum drawdown <br /> A fresh bailer is used to collect enough water for the <br /> requirements of the laboratory for the analyses needed or <br /> required The water samples are decanted from the bailer into <br /> the appropriate number and size containers These containers are <br /> ranA urithnlit <br /> l L1Clulnisv3 -cleaned to exact <br /> preservatives added, by the analytical laboratory or a chemical <br /> supply company The bottles are filled, with no headspace, and <br /> then capped with plastic caps with teflon liners <br /> The 7 L ��l +- + hQ rrr,iirtir��uatnr .a.ampl C_ Nre <br /> V 1Ctl� Vt LVI..1._L Voir L.aiiia•iy %.IL . .J. Lva.ariw <br /> labeled with site name, station, date, time, sampler, and <br /> analyses to be performed, and documented on a chain of custody <br /> form They were placed in ziplock bags and stored in a chest <br /> cooled to 4°C with ice . The preserved samples are chain of <br /> 2 R603 APPEND. E <br />