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Mass of TPHg and Benzene in Units A/B Groundwater and Saturated Soil, First Quarter 2009
<br /> Chevron Site#306620
<br /> 5606 Pacific Avenue, Stockton, California
<br /> TPHg Mass in Groundwater -306620 - Stockton
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<br /> (Mongomery Ward's site Unit A/B) 10,000 2,722 2,722 40 108,880 0.43 1,325,897 10,000-19,000 13,784 18,276,230,101 40.3
<br /> 1,000 6,063 3,341 40 133,640 0.43 1,627,414 1,000-10,000 3,162 5,146,336,403 11.3
<br /> 100 10,472 4,409 40 176,360 0.43 2,147,642 100-1,000 316 679,143,885 1.5
<br /> (Former Unocal site Unit AB) 100 622 622 40 24,880 0.43 302,979 100-270 164 49,784,479 0.1
<br /> Total TPHg Mass in Groundwater= 53 Pounds
<br /> Benzene Mass in Groundwater -306620 -Stockton
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<br /> (Mongomery Ward's site Unit AIB) 100 1,215 1,215 40 48,600 0.43 591,831 100-360 190 112,292,106 0.25
<br /> 10 3,557 2,342 40 93,680 0.43 1,140,798 10-100 32 36,075,187 0.08
<br /> Total Benzene Mass in Groundwater 0.3 Pounds
<br /> TPHg Mass in Saturated Soil -306620 -Stockton
<br /> Goundwater
<br /> Volume of Soil
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<br /> (Mongornery Ward's site Unit AIB) 10,000 13,784 100,072 108,880 62,062 2,985,784 298,793,913,081 658.8
<br /> 1,000 3,162 22,958 133,640 76,175 3,664,770 84,136,278,842 185.5
<br /> 100 316 2,296 176,360 100,525 4,836,267 11,103,168,316 24.6
<br /> (Former Unocal site Unit A/B) 100 164 1,193 24,880 14,182 682,277 813,916,073 1.8
<br /> Total TPHg Mass in Saturated Soil 871 Pounds
<br /> Benzene Mass in Saturated Soil -306620 - Stockton
<br /> Meang Snll Volume Jj 'Soil'
<br /> ume Location
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<br /> 48,600 27,702 1,332,743 298,386,891 0.66
<br /> (Mongomery Ward's site Unit AIB) 100 190 223.89
<br /> 10 32 37.31 93,680 53,398 2,568,959 95,860,370 0.21
<br /> Total Benzene Mass in Saturated Soil 0.9 Pounds
<br /> J0g(ItPPCrrang4+IG8&Werrange)
<br /> Soil Concentration(pg/kg)=Fac'Koc CIT" Mean log Concentration(pg/L) 10 2 Notes:
<br /> where, Assumptions: 1 Organic carbon fraction referenced from
<br /> F�,,=Organic Carbon fraction estimated as 0.02 A zone=30 to 50 feet bgs, B zone=50 to 70 feet bgs,C-Zone=85 to 90 feet bgs,D-zone 97 to 103 feet bgs. http:/Iwebsoilsurvey.nrc-s.usda.goviapp/VVebSoilSu"e aspx
<br /> K.=Organic carbon partitioning coefficient(Ukg) Unit A/B groundwater column is 40-feet thick based on A and B zone definitions for the site. 2 Environmental Protection Agency, Soil Screening Guidance:Technical
<br /> K.,,value of 363 for used TPHg and 59 used for Benzene 2 Unit D groundwater column is 6-feet thick based on D zone definition for the site. Background Document, Pp.C-1
<br /> Cgw=Dissolved phase concentration(pg/L) Unit A/B porosity(rt)is 0.43 based on mainly sandy soil lithology from AS-33 boring log between 30 and 70 feet bgs. htto://www.epa.gov/oerrpage/suReifundihealth/conmediatsoil/introtbd.htm
<br /> Volume of Groundwater=Total Volume x Porosity(n) Unit D porosity(n)is 0.43 based on mainly sandy soil lithology from MW-8D boring log between 97 and 103 feet bgs.3 Since gasoline is a mixture of compounds,the K,value of ethylbenzene is used to
<br /> Volume of Sol]Solids= (1-ij)x Total Volume Unit A/B soil bulk density=1.7(q/cc)based on mainly sandy soil lithology from AS-33 boring log between 30 and 70 feet bgs.4 approximate gasoline.
<br /> Soil Mass(kg)=volume soil(L)x yd(kg/L) Unit D soil bulk density 1.7(gicc)based on mainly sandy soil lithology from MW-8D boring log between 97 and 103 feet bgS.4 Porosity referenced from htti):/Aqeb.ead.ani.gov/resrad/datacoillporosity.htm
<br /> Dissolved TPHg=Mean log Concentration x Volume of Groundwater 4 Soil bulk density referenced from
<br /> Contaminant Mass(lbs) contaminant mass(pg)x 2.205X 10-9(lbs/pg) hftp://Www.yedosphere.com/resources/bulkdensi�/t riangle us,Gfm?274,29
<br /> Meao la" Discolv-e-d-Benzen Isso
<br /> Mas§
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<br /> Contour Value 01T,
<br /> 41g L)
<br /> 01231-154 AECOM Environment
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