Laserfiche WebLink
' Phase II Field <br /> ARCADIS Investigation and LNAPL <br /> ' Mobility Evaluation Report <br /> Union Pacific Railroad Company <br /> Former Maintenance Facility <br /> ' Tracy, California <br /> Kn —Kw P"Pw (Equation 7) <br /> — <br /> ' PwPn <br /> Where, <br /> Kn = LNAPL hydraulic conductivity, cm/s <br /> Kw = water hydraulic conductivity, cm/s <br /> Pn = LNAPL density,grams per cubic centimeter(g/cm3) <br /> pw = water density, g/cm3 <br /> Pn = LNAPL viscosity, centipoise <br /> tNw = water viscosity, centipoise <br /> The LNAPL gradient is calculated from the hydraulic gradient with corrections for fluid <br /> density. Equation 8 presents this relationship between LNAPL and water gradients and <br /> densities. <br /> ' <br /> in w=J P" (Equation 8) <br /> PW <br /> Where, <br /> Jn = LNAPL hydraulic gradient,dimensionless <br /> Jw = water hydraulic gradient, dimensionless <br /> Following completion of the calculations presented in Equations 2 through 8, LNAPL <br /> pore velocity can be calculated. Pore velocity of any fluid type is a function of the fluid- <br /> specific conductivity, gradient, and porosity.The basic equation of pore velocity is <br /> altered to account for the presence of LNAPL and flow in a multiphase system, as <br /> shown in Equation 9. Relative permeability is a modification to the velocity calculation <br /> as a whole to account for reduced permeability due to the presence of water and <br /> LNAPL. The presence of residual LNAPL effectively reduces the formation porosity <br /> and, therefore, LNAPL saturation modifies the porosity parameter. <br /> Vn =Kn n (km (Equation 9) <br /> J <br /> Where, <br /> Vn = LNAPL pore velocity, cm/s <br /> 77 = porosity, dimensionless <br /> 22 <br /> VuW44nWl MONIMI 13S3010) <br />