Laserfiche WebLink
SITE CONCEPTUAL MODEL <br /> Former Shell Service Station/Econogas Station <br /> 880 Victor Road, Lodi, California <br /> Site Address 1880 Victor Road Incident Number- 198995526 <br /> City Lodi, California Regulator San Joaquin County Public Health <br /> Services, Environmental Health Division <br /> Item Evaluation Criteria Comments/Discussion <br /> 1 <br /> Hydrocarbon Source <br /> 1 1 Identify/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 1999, <br /> and November 1999 suggest that the former USTs are the <br /> likely source of the petroleum hydrocarbons and fuel <br /> oxygenates detected in groundwater beneath the site Release <br /> volume is unknown <br /> 1 2 Discuss Steps Taken to Stop The USTs were removed and replaced in December 1994 and <br /> Release significant over-excavation was performed at that time <br /> 2 Site Characterization <br /> 2 1 Current Site Use/Status The site is currently an active Econogas fuel station <br /> 2 2 Soil Definition Status The lateral and vertical extents of TPHg and benzene in soil <br /> have been defined around the USTs by borings SB-1 through <br /> SB-5 The lateral and vertical extents of TPHg and benzene in <br /> soil have been defined in the vicinity of the dispensers by <br /> borings GP-3 through GP-6 The vertical extent of fuel <br /> oxygenates in soil near the USTs (presumed source area) is <br /> defined by CPT-1 and CPT-2 The vertical extent of fuel <br /> oxygenates in soil near the dispensers is defined by GP-3 <br /> through GP-6 <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 due to <br /> (BTEX) elevated detection limits Maximum concentrations detected <br /> are 183 ppb TPHg and 10 ppb benzene Detection limits for <br /> TPHg range from a50 to X5,000 ppb and benzene detection <br /> limits range from a0 5 to X25 <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 have not increased <br /> significantly <br /> 2 6 Groundwater Definition Status MTBE, TBA, and TAME have been detected in all three site <br /> (oxygenates) wells DIPE and ETBE have not been detected in site wells <br /> 2 7 Oxygenate Plume Stability and TBA and TAME are delineated vertically in the source area by <br /> Concentration Trends borings CPT-1 and CPT-2 TBA and TAME were not detected <br /> in groundwater from borings CPT-4 and CPT-6 Because the <br /> lateral extent of oxygenates in groundwater is not fully <br /> assessed, it is not possible to assess plume stability, although <br /> oxygenate concentrations appear to be stable <br /> 0955 Page 1 of 3 Date Modified 4/18/02 <br />