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Mr Harlin Knoll <br /> San Joaquin County Environmental Health Division N <br /> 24 October 2000 <br /> . Page 5 <br /> The volume of 400 µg/I impacted groundwater was calculated using <br /> VW 400 = II(r a0) d it <br /> where <br /> • VW 400 is the volume of 400 µg/I impacted groundwater <br /> I • r400 is the estimated radius of impacted groundwater = 18 ft (Figure 3) <br /> • d is the estimated depth of impacted groundwater = 10 ft <br /> I • r1 is the porosity value for a silty sand = 0 35 <br /> VW 400 = nr2d = rI(18 ft)z(10ftX0 35) = 3,600ft3 <br /> 400 <br /> The volume of 100 µg/I impacted groundwater was calculated using <br /> 22 <br /> Vw 100 — n(r,00 —r40o d Tl <br /> where <br /> VW 100 is the volume of 100 µg/1 impacted groundwater <br /> • r700 is the estimated radius of impacted groundwater = 33 ft (Figure 3) <br /> • r400 is the estimated radius of impacted groundwater = 18 ft (Figure 3) <br /> lie 0 <br /> d is the estimated depth of impacted groundwater = 10 ft <br /> o tl is the porosity value for a silty sand = 0 35 <br /> VW100 = II(r100 —r oo)dq = II(332 ft-182 ftXl0ftX035) = 8,400ft3 <br /> The Mass (Mw) of impacted groundwater was calculated using the expression <br />' M = concentration groundwater)(volume of groundwater) = C x V <br /> Mw ( g )( g w w <br /> 1 Mass (MW400) of 400 µg/l impacted groundwater in pounds (lbs) <br /> where <br /> 1 • Cw = 400 pg/I TPHg estimated concentration from (Figure 3) <br /> © Vw = 3,600ft3 is the calculated volume <br />' Mw400 = 0 4mg 3 785E 7 48ga1)(3,600ft3 Ib 3 =0 09lbs <br /> .f <br /> L gal t 454x10 mg <br /> 1 <br /> S\BFS\STOCKTON\LTR\LTR005 DOC 10/24/00 <br />