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SITE CONCEPTUAL MODEL <br /> . Former Shell Service Statlon/Econo Gas Station <br /> 880 Victor Road, Lodi, California <br /> 880 Victor Road I�4*Vk'jN_kWW' 98995526 <br /> r z x� <br /> `�]San Joaquin County Environmental <br /> Lodi, California ,e u t <br /> Health Department <br /> C <br /> � -�� r <br /> £� ] f y J in <br /> 1 1 Identrfy/Describe Release Soil data from the December 1994 tank removal and soil <br /> Source and Volume (if known) borings drilled near the USTs in February 1996, January <br /> 1999, and November 1999 suggest that the former USTs are <br /> the likely source of the petroleum hydrocarbons and fuel <br /> oxygenates detected in groundwater beneath the site <br /> Release volume is unknown <br /> 1 2 Discuss Steps Taken to Stop The USTs were removed and replaced in December 1994 <br /> Release and significant over-excavation was performed at that time <br /> 21 Current Site Use/Status The site is currently an active Econo Gas fuel station <br /> 2 2 Sod Definition Status The lateral and vertical extents of TPHg and benzene in soil <br /> have been defined around the USTs by borings SB-2 through <br /> SB-5 The lateral and vertical extents of TPHg, benzene, and <br /> fuel oxygenates in sod have been defined in the vicinity of the <br /> dispensers by borings GP-3 through GP-6 The vertical <br /> extent of fuel oxygenates in soil near the USTs (presumed <br /> source area) is defined by CPT-1 and CPT-2 The lateral <br /> extent of fuel oxygenates in sod is defined by MW-5 through <br /> MW-10 <br /> 2 3 Separate-Phase Hydrocarbon No separate-phase hydrocarbons have been detected onsite <br /> Definition Status <br /> 2 4 Groundwater Definition Status TPHg and BTEX are consistently below reporting limits, <br /> (BTEX) although some reporting limits are elevated Maximum <br /> concentrations detected are 183 ppb TPHg and 10 ppb <br /> benzene Detection limits for TPHg range from <50 to <br /> <100,000 ppb and benzene detection limits range from <0 5 <br /> to <1,000 <br /> 2 5 BTEX Plume Stability and Because the detection limits are elevated, it is difficult to <br /> Concentration Trends assess TPHg and BTEX plume stability or concentration <br /> trends However,these concentrations do not appear to be <br /> increasing <br /> 2 6 Groundwater Definition Status The lateral extent of MTBE is defined (at 1 0 ppb) by wells <br /> (Fuel Oxygenates) MW-6 and MW-8 through MW-10 and the lateral extent of <br /> TBA is defined by wells MW-5 through MW-10 MTBE and <br /> TBA were detected in well MW-11 at 3 0 and 10 ppb, <br /> respectively <br /> 2 7 Oxygenate Plume Stability and MTBE concentrations appear to be stable to decreasing and <br /> Concentration Trends TBA concentrations appear to be increasing in some wells <br /> . and stable to decreasing in some wells <br /> 0955 Page 1 of 4 Date Modhfied 12/5/2003 <br />