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:D <br /> ! D. <br /> Table 5 <br /> Calculations for Mass of Contamination Remaining in Groundwater <br /> ARCO Service Station#4493 <br /> 205 North Center Street, Stockton, CA <br /> Assumed Average L/ft' lbs!pg Mass of kg!lb gal/m3 Density of Volume of <br /> Contaminant Concentration Assumed <br /> Analyte Zone Area(feet' conversion conversion Analyte conversion conversion Analyte Analyte <br /> Thicknessallons <br /> (feet) (pg/L) factor factor Porosity (pounds) factor factor (kg/M3) (gallons) <br /> (A) (T) (C) (Cil, (C2) (P) (M) (C3) (C4) (D) (V) <br /> core 4,000 30 3,600 28.3168 2.2046E-09 0.35 77.05 0.4536 264.17 730 12.65 <br /> TPHg 2 11,600 30 150 28.3168 2-2046E-09 0.35 9-31 0.4536 264.17 730 1.53 <br /> 3 9,400 30 75 28.3168 2.2046E-09 0.35 3.77 0.4536 264.17 730 0.62 <br /> 90.14 14.80 <br /> core 600 20 9 28.3168 2.2046E-09 0.35 0.02 0.4536 264.17 879 0.00 <br /> benzene 2 13,400 20 2 28.3168 2.2046E-09 0.35 0.10 0.4536 264.17 879 0.01 <br /> 0,i 1 0.02 <br /> core 30,000 30 68 28.3168 2.2046E-09 0.35 10.92 0.4536 264.17 740 1.77 <br /> MtBE 2 10,000 30 5 28.3168 2.2046E-09 0.35 0.27 0.4536 264.17 740 0.04 <br /> 11.18 1.81 <br /> M=AxTxCxC1 xC2/P 1I <br /> V=MxC3xC41D AV L ! 4rE«+t, lty X�Dair05��`¢ VUi�w �k-t'o <br /> pg=micrograms 3 <br /> 1 <br /> L=liter VQ! ;l��x lOZ.`g I�).41 >: r- ,� Cm«'{ � = �{2 arao Ft` azo <br /> f=square feet <br /> lbs=pounds _ Zj 4 ZZ f C40 <br /> kg=kilograms / <br /> gaF---­gaT1on <br /> m3=cubic meters <br /> The following assumptions were usedi <br /> the core of the TPHg plume is shown on Figure 3 within the 1,000 pglL contour line, <br /> the average TPHg concentration in core is 3,600µg4L, /"53✓1n�F 31-/S aG ���r <br /> the average TPHg concentration in zone 2(between the 1,000 uglL and 100 uglL contour lines)is 150 Ag/L, <br /> "the average TPHg concentration in zone 3(between the<50 mg/L and 100 mg/L contour lines)is 75 pg/L, f�mP� ` e P F0""�� ---••••••+++rrr <br /> "the average TPHg concentration outside zone 3 is negligible and assumed to be 0 1,41-1 <br /> the core of the benzene plume(shown on Figure 5 within the 10 ug/1-Contour line)is 9 pg/L, <br /> the average benzene concentration in zone 2(between the 1 ug1L and 10 ug/L contour fines)is 2 pg/L, <br /> the average benzene concentration outside zone 3 is negligible and assumed to be 0 pg/L, <br /> `the core of the MtBE plume(shown on Figure 4 within the 10 ug4L contour line)is 68 pg/L, <br /> `the average MtBE concentration in zone 2(between the 1 mg/L and 10 mg/L contour lines)is 5 gg/L, <br /> the average MtBE concentration outside zone 2 is negligible and assumed to be 0 pg/L, <br /> •the depth the contamination is penetrating into the shaltow aquifer is 30 feet,and <br /> "The porosityof the soil is 35%. y <br /> �� to a o p.,s�¢ 33 Lff0#.,�f� = „�e o y"J Jty <br /> - ov3� gC �s <br /> .ooao43b 1�/k� <br /> mass calcs Page 1 of 1 SECOR <br />