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SESOIL MODELING RESULTS I CONTAMINANT FATE AND TRANSPORT WITHIN THE VADOSE ZONE I Idlewild Market 3049 Highway 12 Lodi, California Prepared by: Condor Earth Technologies, Inc. May 23, 1996 10 INTRODUCTION The results of contaminant fate and transport modeling conducted for the Idlewild Market site are presented in this report (Figures 1 and 2, Appendix A) The purpose of the modeling was to assess the potential migration of gasoline constituents contained in approximately 1 5 cubic yards of soil located at a depth of approximately 10 feet below the ground surface (bgs) The modeling for this site focused on toluene, ethyl benzene, xylene, and ethylene dibromide (EDB) Benzene was not detected in any of the soil samples collected from soil remaining at the site This ieport includes a discussion of previous investigations conducted at the site, a description of the SESOIL model, the parameters used during the modeling, the results of the modeling, conclusions, and I ecomm endat tons 2 0 PREVIOUS INVESTIGATION I In May, 1993, four UST's (Tl, T2, T3 and T4) were removed from the site and soil samples were collected from beneath two UST's (T5 and T6) partially located beneath the Idlewild Market building The six UST's were located at two separate locations, Pit 1 and Pit 2, as shown on Figure 2 Appendix A Pit 1 contained Tl through T3 and Pit 2 contained T4 through T6 Laboratory analyses of soil samples collected from Pit 1 indicated hydrocarbon contamination was present beneath the former location of TI and T3 at 9 0 to 9 5 feet bgs No evidence of hydrocarbon contamination was detected at or above I the reported laboratory detection limits in the sample collected from beneath T2 at 12 feet bgs No evidence of hydrocarbon contamination was detected at or above the reported laboratory detection limits in the samples collected from Pit 2 San Joaquin County Public Health Services, Environmental Health Department (PHS/EHD) stated in a letter dated July 23, 1993, that no further investigation was required Iin the area of Pit 2 Immediately following the collection of soil samples from beneath T1, T2, and T3, petroleum stained soil ' within Pit 1 was over-excavated At the conclusion of the over-excavation, field observations indicated an area of gray, petroleum stained soil from a depth of approximately 6 to 1 1 feet bgs and approximately 6 feet wide was present on the north sidewall The stained soil was not removed due to the likelihood I 1 ' �� CONDOR