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i <br /> 194 Practical design calculations for groundwater and soil remediation <br /> Q (50gal/,nM)(lft3/748 gal) <br /> 2nBu _ (2)(71)(80 ft)(1 39 x 10-3 ft/mm) _ 6 ft <br /> d Deternime the sidestream distance of the envelope far upstream of <br /> the pumping well, Q/2Bu <br /> _R_= (50ga1/min)(1ft3/748 <br /> p!) =300ft <br /> 2Bu (2)(80 ft)(139 x 10-3 ft/min) <br /> e The general shape of the envelope can be defined by using the above <br /> characteristic distances <br /> x(ft) y(fl) Note <br /> 0 0 Well location <br /> —96 0 Downstream distance (stagnation point) <br /> 0 15 Sidestream distance at the line of the well <br /> 0 —15 Srdestream distance at the Ime of the well <br /> 150' 30 Sidestream distance at far upstream of the well <br /> 150* —30 5idestieam distance at far upstream of the well <br /> The sidestream distance far upstream of the well,±30 ft,should occur <br /> atx=- A value of 150,which is ten tunes the srdestream distance at <br /> the line of well,is used here as the value of x <br /> Stagnation Y <br /> 40 <br /> PaintGroundwater Flow <br /> +-20 <br /> � ■ <br /> Pumping weli x <br /> -40 sa <br /> 120 i60 <br /> ■ <br /> Figure E VI 1-2B Capture Zone of a single well <br /> Multiple wells <br /> Table V1 1 A summarizes some eharactenstic distances of the capture zone <br /> for multiple groundwater monitoring wells located on a line perpendicular <br /> �! to the flow direction As shown in the table, the distance between the divid- <br /> # itzg streamlines far upstream from the pumping wells is equal to n(Q/Bu), <br /> where n is the number of the pumping wells This distance is twice the <br /> distance between the streamlines at the line of the wells <br /> I 2 <br /> �r <br /> 4 <br />