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Chemical Parameters (default parameters) <br /> Chemrral Organic Carbon Molecular Diffusion <br /> ' Partition Coefficient coefficient <br /> (ug/gOC/ug/ml) (cmi/s) <br /> ' Benzene 83 9 80E-06 <br /> Toluene 300 8 60E-06 <br /> EthY lbenzene 1100 6 80E-06 <br /> ' Xylene 240 7 80E-06 <br /> ' Rector Well,Data (Refer to Final Closure Report Figure 6) <br /> x-coordinate = 67 in (distance from MW-9 to property line <br /> along flow path) <br /> y-coordinate = 0 m <br /> z-coordinate, top of well = 0 m <br /> ' z-coordinate, bottom of well = 7.62 in <br /> 1 In general, the selected values for these input parameters represent conservative <br /> estimates of the actual values. Assuming that the highest concentration occurs at a point <br /> ' source at MW-9 is more conservative than the actual field conditions based on the <br /> monitoring data The mass of contaminant has been conservatively estimated using the <br /> ' entire area of the plume and a depth of 10 feet (3 05 meters) An effective porosity of <br /> 0 25 was calculated using the step draw down test results. The porosity has been <br /> ' decreased to 0 20 to present a more conservative estimate. The hydraulic conductivity is <br /> based on the highest value of transrrussivity (35 W/day) obtained during the step draw <br /> down test This provides a higher hydraulic conductivity and a faster transport rate <br /> ' Dispersivity values are based on rules-of-thumb in which the longitudinal dispersivity is <br /> 0 1 times the flow path and the transverse dispersivity is 0 1 times the longitudinal <br /> ' dispersivity The vertical dispersivity is estimated at 0 05 times the longitudinal <br /> dispersivity The fractional organic carbon content was not measured for soils at the site. <br /> Soils with lower organic carbon content provide less retardance to chemical transport <br /> ' 96R7 Fast Bay Municipal Utility District <br /> 40429700 Fcr Final Closure Report <br />