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CONCEPTUAL CROSS SECTION <br /> 3` <br /> Former Gasoline :OPO > <br /> 3` e <br /> Edge of Former Excavation @ D1esN Tanks a oy <br /> (backfinedl 5$ 6 asphalt <br /> +15 <br /> i <br /> A _': _"_ : _ ._% TOTAL TPH-g MASS <br /> +5 DECREASES OVER TIME <br /> Clay B <br /> -5 <br /> Tan Sand Residual E <br /> Unsaturated Zone <br /> J - <br /> lcn <br /> G <br /> w t5 D TsPm <br /> Residual Ga5011De in \ 3 <br /> Saturated Zone Silty Clay ,. v 10= <br /> 25 <br /> F C <br /> 35 Gray Sand(increasing Silt with depth) <br /> Clay <br /> Plumeg <br /> plume Contours <br /> A 5 USTs two diesel and three gasoline)were removed in D O g pg 40"S.EL DORADO STPRO REET <br /> ( g ) Oxygenated groundwater enters on u radient side <br /> July 1990,soil excavated to approximately 15 ft.BGS. sTOCRTON,cA <br /> E Soil vapor extraction wells remove petroleum vapor within """'"` <br /> B Residual petroleum in initially unsaturated soil below the - unsaturated soil above the water table(4,500 kg removed from CONCEPTUAL MODEL OF CONTAMINANT <br /> MIGRATION AND REMEDU1TIDN <br /> tion remains in the unsaturated zone,and in the saturatedd zone zone 2003 to 2007) <br /> below water table after water levels rise(1994-present) F <br /> Air sparge injects air into the aquifer helping to volatilize petroleum °�" AS141® "EXP °bA1°�""• <br /> C Plume of affected groundwater contracts over time due to natural and add an a <br /> impacts " 60E""� <br /> attenuation(aerobic biodegradation of petroleum hydrocarbon) p oxygen source to stimulate aerobic degrada- ane wwvam FIGURE s <br /> lion of petroleum compounds(2003-2007) <br /> and source depletion from 1990 to the present <br /> o.m.uX:a um m.s <br /> O�E89P➢11WOFm1f69]01nm1 Jctl <br />