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j , tjwl�wQv� �4,'�cr luift�w�oyy > Joe's Truck Plaza Facility Zo u l f 15600 South Harlan Road tw�ll�flay . Lathrop California I Estimation of Mass Flux Rate for TPHG and MTBE using Einarson and McKay Equations Objective:To estimate the mass flux and thereby project the concentrations and mass extraction j rates for the extraction well Basis: 1. Transect perpendicular to groundwater flow direction 2. Average height of water column in wells between February 2000 and June 2004 3. Average MTBE concentrations between February 2000 and June 2004 4. MTBE concentration for well MW-7 from sample collected during DPE test 6. Average groundwater gradient between February 2000 and June 2004 7. MTBE concentrations is assumed to be constant along the chosen length and width of well j cross-sectional area 8. Height of average water column chosen = DTW- TD 9. For width of well to estimate well cross-sectional area, half the distance between wells were used. For example, well MW-3 is approximately 240 feet from well MWO-3 and approximately 178 feet from well MW-4, so a width of 209 feet (120+89) was used as width for well MW-3 to estimate the well cross-sectional area (see attached Figure) 9. For wells located at the ends of transect, half of the distance to the adjacent well was used For example, well MW-5 is located approximately 68 feet from well MW-4. Half this distance is 34 feet so a distacne of 68 feet was used for the well cross-sectional area (see attached Figures) Abbreviations: Mo Mass flux Well location/well ID Ai Cross sectional area of well " i " Li Length (height of water column) for well "I" Bi Width for well "I' Ci Concentration at well " i " Q; Specific groundwater discharge Q; hydraulic conductivity hydraulic gradient pg/L micrograms per litre sq.ft square feet gm/day grams per day i I ft/day feet per day gpm gallons per minute Conc. Concentration Ht. Height WC Water Column Avg. Average