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03/10/2005 15:57 5306766"95 STRATUS NO CALIF— PAGE 03/10 <br /> Battslkc Q <br /> 1,Simnd Ou-sit',BiO—edinfio"$YMP"='Jun';2 <br /> -57Ad3 <br /> ESTIMATING coNT't MINAN Tj MASS FLUX FROM A RELEASE SITE <br /> Einarson and Mackay (2001) define the mass flux, mj (g(day), according to <br /> Equation 1: (Equation 1) <br /> M D CjAjqjc,f <br /> j within area i (ggtL) <br /> e contaminant cOnCentratiOh <br /> where, Ci=avera-,, i� 2 <br /> Ai=cross sectional area ;t or m <br /> qj=specific groundwatersc arge(ft/day or m/daY) <br /> cf=units conversion facto'r's1. 2.83 x 10-5 (9-14to—ft 3) <br /> i = 1 to n well locations <br /> Assuming there is no degradation between the transect and supply well, the <br /> concentration expected in the Sup <br /> ply well, C,,, is given by Equation 2 (Einarson and <br /> Mackay, 2001): <br /> CCf (Equation 2) <br /> SW D <br /> Q$W <br /> w1jere, mass flux estimate(Zlday) <br /> Qsw=supply well pumping rate(gpro or L/M) <br /> Cf=units conversion fact6r- 184(Ag-9al-d)/(g-L-rnin) <br /> The transect approach requires a transect of sampling points, which delineate the <br /> entire width ofthe contaminant plume, oriented perpendicular to the direction of <br /> , <br /> groundwater flow (digures la and 1b). The transect should consist of single/multi-level <br /> monitoring wells or well points�o enable lateral and vertical delineation of the plume. <br /> W1 W3 W4 <br /> W1 <br /> W4 .Sr 74 <br /> Groundwater flow direction; <br /> Velocity,qj <br /> FIGURE,lb- <br /> FIGURE la. <br /> Transect orientation relative to Transect well locations(cross-sectional <br /> groundwater and plume view);L—Jength,B-saturated tbickness, <br /> orientation(plan view)i. A-area=LB <br /> A reliable estimate of mass flux is dependent on the quality of the site <br /> rn <br /> characterization effort and thei quality of data that comprises the variables of the ass <br />