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L <br /> v <br /> D <br /> A S S O C I A T E S I N C <br /> Analytical results of soil samples are summarized in Table 1. <br /> 4_2 Groundwater Analytical Results <br /> 1. The groundwater samples collected from wells MW1, MW2, NM, MW4, and MW5 showed no <br /> concentrations of TPHg, benzene, toluene, ethylbenzene, total xylenes, and oxygenate fuel <br /> additives detected above their laboratory method detection limits. <br /> Analytical results of groundwater samples are summarized in Table 2. <br /> Yt g P <br /> 5.0 DISCUSSION <br /> Based on past analytical results and field observations, soil and groundwater beneath the location <br /> ' of the former 500-gallon gasoline UST is moderately impacted by petroleum hydrocarbon <br /> constituents. The observations detailed in this report do not show that lateral migration of <br /> ' petroleum hydrocarbon impacted groundwater has occurred. <br /> In the judgment of ATC, additional groundwater monitoring appears appropriate to confirm <br /> nondetectable concentrations of petroleum hydrocarbons. Based on the chemical results of the <br /> additional monitoring, if sampling continues to show that petroleum hydrocarbons are not <br /> detected in groundwater, the site should be recommended for closure. <br /> wA17292Veports Sup_subsurf_investAm 5 <br />