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WON MM w4mm I M M �= M `♦" OW TABLE 5-4 ESTIMATED MASS OF TPH-g AND BENZENE IN SOIL CALTRANS-STOCKTON YARD MAINTENANCE STATION,STOCKTON,CALIFORNIA FEBRUARY 2000 AREA,VOLUME,AND MASS OF CONTAMINANTS BASED ON ISOCONCENTRATION CONTOURS-SOIL - Maximum Mass Based an Arithemetic - Isaconcentration Observed Areal Impacted impacted Isocorlcentration Maximum revel Mean of Contour Concentration Extent(A>) Volume(V) Volume(VJ Contour(MI) Observed Mill Was Contaminant Depth I!1(aryal(7.j) (C,1 (CI) (lit) (m') (Yd's (k9) (k9) (ka) TPH-g 40 to 45 ft bgs >10 mg/kg 31 235 358 468 6 18 12 46 to 51 ft bgs >10 mglkg 30 1029 1568 1 2050 26 78 1 52 >100 mg/kg 5OL4 214 327 427 54 270 162 VTP i,Total VTpH,Total Total Total MTPN,Total Total Volume and Mass Estimates 1 2253 2945 86 366 226 Benzene 21 to 30 ft bgs >10 pglkg 16 99 302 394 0 005 0 008 001 31 to 40 ft bgs >10 pglkg 14 1316 4015 5247 0 066 009 008 >100 glkg 250 198 604 789 0 010 025 013 41 to 50 ft bgs >10 kg 64 958 2922 3819 0 048 031 018 >100 pg1kq 790 1210 3691 4824 0 061 481 244 51 to 60 ft bgs >100 pg/kg 140 193 590 771 0 010 014 007 61 to 70 ft bgs >10 pglkg 88 1105 3369 4403 0 056 049 027 >100 pglkg 240 234 714 933 0 012 028 0`15 Vs,..,Total VTPH-,Total Total Total Meen.Total Total Volume and Klass Estimates 16206 21180 0 267 6 378 332 Assumptions Isoconcentration contours presented in Figures 5-5 through 5-6 used as basis for calculation of volume and mass of Impacted soil Areal extent-calculated using function within Autocad Impacted Volume-3 05-meter depth intervals used to calculate volume from area(i a z,=3 05 m for all cases) Mass Based on Isoconcentratlon Contour-The mass was calculated based on the assumption that all the soil within a given isoconcentration contour was Impacted at that given concentration(i a the sod volume within the 1,000 mg/kg contour is all impacted at 1,000 mglkg) Mass Based on Maximum Level Observed-The mass was calculated based on the assumption that all the sod within a given isoconcentration contour was Impacted at the highest concentration observed within the said isoconcentration contour (I a the soil volume within the 100 mg/kg is all impacted at 240 mglkg) Arithmetic Mean of Mass-Total mass based on arithmetic mean of mass estimated by isoconcentration contour and mass estimated by maximum detected concentration for the respective isoconcentration interval(I e, 10 0 mg/kg to 100 mg/kg,and>100 mg/kg) I Page 1 of 2 S 1PROJ141040100041SYYARDTable 5-4