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s TABS ESTIMATED MASS OF TPN g AND BENZENE IN SOIL CALTRANS-SHOP 10 MAINTENANCE STATION,STOCKTON,CALIFORNIA FEBRUARY 2000 AREA,VOLUME,AND MASS OF CONTAMINANTS BASED ON ISOCONCENTRATION CONTOURS-SOIL Maximum Mass Based on Mass Based on Isoconcentration Observed Areal: Impacted Impacted Isoconcentration Maximum Level Average Contour Concentration Extent(A,) Volume(Vtj Volume(V,j Contour(M,) Observed(M,) Mass Reference Contaminant Depth Interval(Z,j (Ct) (CJ (m.1) (m) (yds) (kg) (kg) (kg) Figure TPH-9 11 to 20 ft bgs >10 mglkg 71 156 475 621 76 54 31 5-5 A >10 000 mg/kg 11 000 14 44 57 07 773 387 21 to 30 ft bgs >10 mg/kg 10 44 1351 176 22 22 22 >100 mglkg 980 53 1621 212 26 255 129 >1 000 mg/kg 13 000 23 70 91 1 1 1454 727 31 to 40 R bgs >10 mg/kg 25 342 1043 1363 17 42 29 5 5 8 >100 mg/kg 240 50 153 200 25 59 31 >1 000 mg/kg 1 100 6 19 241 03 33 17 41 to 50 it bgs >10 mg/kg 12 530 1616 2112 26 31 29 >I 00 mg/kg 270 1521 464 606 74 201 104 VTpH,Total VTP„,Total Total Total MTp"vTotal= Total Volume and Mass Estimates 4180 5461 67 2904 1486 Benzene 1 to 10 ft bgs >I 0 g 37 535 1632 2132 003 010 006 5-6 A >100 yog 800 208 635 830 001 082 041 11 to 30 it bgs >10 pg/kg 10 389 1186 1550 002 002 002 >11 00 glkg 830 194 593 775 001 079 040 >1 000 pgtkg 1 100 34 105 137 000 019 009 31 to 40 ft bgs >10 PgN 10 518 1581 2066 003 003 003 5 6 B >100 pglkg 840 756 2305 3013 004 311 157 >1 000 pg/kg 7700 128 391 512 001 484 242 41 to 50 ft bgs >11 0 ig/kg 10 447 1363 1781 002 002 002 >100 I.L91k9 67D 767 2340 3058 004 252 128 >1 000 pgtkg 4700 274 835 1091 001 630 316 51 to 60 ft bgs _>10g/kg 10 4751 1448 1892 002 002 002 >100 pglkg 810 205 6241 8161 001 081 041 >1 000 pg/kg 2000 17 511 671 Goo 016 008 Vee..,,.Total IVk...Totall Total Total M..,,=.MTota1= Total Volume and Mass Estimates 15088 19719 024 20 10 Assumptions Isoconcentralion 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(r a zi=3 05 m for all Cases) Mass Based on Isoconcentratton 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 soil volume within the 1 400 mg/kg Contour is all impacted at 1 000 mg/kg Mass Based on Maximum Level Observed-The mass was calculated based on the assumption that all the soil within a given isoconcentratron Page 1 of 2