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Total Petroleum Hydrocarbons have not detected at depths shallower than 20 feet since Soil <br /> Vapor extraction (SVE) was performed This is inferred to be due to the removal of <br />' contaminants from the vadose zone via the SVE performed from February 2000 to October 2004 <br /> 3.5.i Composition and Concentration <br />' Leaked hydrocarbons at the site consist of gasoline and diesel-range analytes and mixtures <br /> Neither MTBE nor other recent oxygenates are present in the subsurface in relation to the release <br />' from the former site UST systems <br /> Hydrocarbon concentrations in some areas beneath the water table exceed their solubility limits <br /> because SPH is locally present SPH was visually observed in soil samples recovered from DP- <br /> 9, the only boring from which soil samples were recovered <br /> It is inferred that there is no longer mobile SPH at the site This is because of the age of release <br /> and absence of SPH or sheen or hydrocarbon supersaturation in wells and water samples from <br /> ' the site <br /> 3.5.2 Latera!Extent <br /> ' The lateral extent of dissolved and sorbed hydrocarbon appears to be as follows <br /> o Beneath most or all of the space between the property buildings and the corner of <br /> Lincoln St and Charter Way <br /> • Beneath a portion of Lincoln Street, extending eastward from the property <br /> ' Lincoln Street is owned by the City of Stockton <br /> 1 The lateral extent of hydrocarbon is uncertain in the following areas <br /> o Beneath the Transmission Shop building <br /> ' o Beneath the drapery shop building (i e , north of wells VW-3 and MW-4-RS and <br /> MW-4-RD) <br /> ' e Beneath the SVE compound that lies between the two property buildings <br /> G Beneath Charter Way, south of the property <br /> ' 3.5.3 Vertical Extent <br /> 1 Hydrocarbons associated with the former property UST systems appear to be limited to the <br /> saturated zone Various data indicate that the vadose zone has largely been remediated of <br /> hydrocarbons The site water table has fluctuated between about 19 and 27 feet bgs in the last <br /> several years Because of this the "shallow limit" of hydrocarbons fluctuates dynamically <br /> between about 20 to 25 feet bgs <br /> ' SSCDP N ITwhPub112022f Dorn RodM RPtSISIRI,9XM92006SIR fAU9USQ dX �_� <br /> 82306 <br />