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41 <br /> zz <br /> , �_.LEARWATER { ; <br /> eft. <br /> t _ <br /> design;.in 'addition, it will allow time for re-equilibration'-o€ hydtocarbori:T <br /> va 'ors in the soil ores- ".rechar `e'.': durin off-lin <br /> e r' <br /> I P, P v( g ) g pe iods.' ,. �• .� <br /> i u You` "requested calculations indicating:flow restrictions through elbows and <br /> u along the length of'the-pipe ;Friction loss ('measured:in inches of water <br /> column) iso a function of•piping diameter;:length, and flow rate. <br /> Qn the basis''of vacuum and flow rate data collected on°:February 23 fr' rnaVW' t <br /> 4=and :VW=5, assume: <br /> VW-4 flow at 70 cfm and 6:7 inches water column (wc:} _ I <br /> V.W. at 2Q efm"and:7.8Anches.w:c71 <br /> ;. ,,-",,Each,well. h'as 50 linear feet bf piping and 4Fright-angle elbows (equivalent to <br /> -a. an::addifional,2Q linear feet of pipe.at,eachawell) <br /> Using these data,`the calculated frictional losses for VW=4 and VW=5 are'' : <br /> 4 5:7 and 1 inches w c:;:respectively: <br /> These calculailons'w`ere-made'using values for;frictional.loss per,linear foot <br /> of piping (in'Mches w.c} and,frktional-loss.for pipe elbows, (in equivalent. : <br /> l linear foot=bf i m The'.values were obtained from curves. in the EG&G ` <br /> P P g) <br /> } 'Rotron �blower.:rnanual (see:attachment); . E� _' l <br /> .4' • 4' ' • .. , <br /> ParagraphQ= <br /> The tabic ui.Appendix C was`derived from an EXcel spreadsheet set up to <br /> ` .., <br /> ' calculate hydrocarbons recovered through operation o f.the SVE system: We ' <br /> a ' <br /> t <br /> are-currently,working on a.:new.form l at'that will be easier.to understand and. : <br /> will`include'coluirrns;presenting laboratory`data;-conversion'.factors, and ' <br /> .result'sYof the calculations This new table format`will be;supplemerited'by <br /> `A`mcalculation sheet 'that shows all of the;pe'rtine�it.general-formulae and <br /> assumptions. Please feel free,to call if you have-sug'estions lhAtyou would <br /> , _ <br /> lik_e• to have incorporated into.the new,spreadsheet setup:. , . <br /> Paragraph 11. <br /> Clearwater's recomrnendat on to monitor biogenic gases`at the.safe may Have <br /> been-misinterpreted.by PHS/EHD. the �measurementof-.b ogenic gases was <br /> proposed as' -an additional`'nlethod of evaluating the performance'of the :. J <br /> system.;-As';,discu5sed in:our letter dated`May.24, 1995, it=is anticipated that l <br /> when the}vapor extraction process is near completion,,':oxygen uptake and; <br />