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Spill Travel Time Calculation <br />Chevron SPCC <br />Banta CA <br />Regional Groundwater Flow Model <br />Key Model Input and <br />Formation Thickness Modeled Modeled Aquifer Effective <br />Groundwater <br />By <br />Output Parameters <br />Boring Log Hydraulic Transmissivity Porosity <br />Travel Time to <br />MW48A <br />Description Conductivity <br />Water of US <br />60 <br />Symbol <br />D K T n <br />T <br />HH <br />Units <br />feet fee;oay toot' day <br />years <br />Input <br />38 <br />HH <br />Note: <br />Seepage velocity V = K x i + n, based on Darcy's Law <br />Seepage time T = D + V <br />In vertical seepage conditions, vertical hydraulic gradient between points Z, and Z2 = [ (Z,+P,) - (Z2+P2) ] + (Z, -Z2) = 1, because pressures are atmospheric and P, = P2 <br />Field measurements of hydraulic conductivity are considered having an order of magnitude of uncertainty in sediment aquifers (USGS, 2004) <br />Hydraulic conductivity derived by regional groundwater <br />flow model has t50% of uncertainty, that affects groundwater travel time by ±50 <br />ERM <br />Calculated and Modeled Groundwater Travel Times <br />7106 Crossroads Boulevard <br />Chevron SPCC <br />Figure 3 <br />- Suite 228 <br />ERM Brentwood TN 37027 <br />Banta, California <br />0110870.01-0&012010-HYH-MJChmonlBanta <br />CNGMS Model.ppl <br />MW48A <br />60 <br />HH <br />OutpU <br />160 <br />9,WC <br />38 <br />HH <br />