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1 v <br /> 0 <br /> A S S O C I A T E S I N C <br /> utilized by DHS as an action level. Analytical results of groundwater samples are summarized in <br /> Table 3. <br /> 5.0 DISCUSSION <br /> Based on the analytical results and field observations, soil and groundwater beneath the location <br /> of the former 500-gallon gasoline UST is impacted by petroleum hydrocarbon constituents. The <br /> impacted soil appears to be limited vertically to the upper 24 feet of the soil column and laterally <br />' to an area within approximately eight feet from the former UST excavation (as exhibited by SB-3 <br /> data). Groundwater impaction is currently not defined although the initial groundwater <br /> analytical data suggest petroleum hydrocarbon constituents in groundwater do exceed current <br /> California water quality goals for drinking water. <br /> In the judgment of ATC, additional groundwater monitoring appears appropriate to confirm <br /> current dissolved hydrocarbon concentrations in groundwater. Based on the chemical results of <br /> the additional monitoring, investigative work further defining groundwater impaction may be <br /> 1 warranted. This additional work may include the installation of additional monitoring wells to <br /> evaluate groundwater chemical characteristics and hydrology. <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> wA 172921repoM\sumwe1.doc 5 <br />