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j <br /> F <br /> Groundwater samples collected from MWS, MW6b, MW6c, MW7a, MW7b, MW7c, MW8, <br /> MW9a, MW9b, MW9c, MW10a, and MW10c contained no detectable concentrations of TPHg <br /> ' or BTEX constituents. <br /> ' Groundwater samples collected from MWi, MW2, MW4, MW5, MW6a, MW6b, MW6c, <br /> MW7b, MW7c, MW8, MW10b and EW1 contained detectable concentrations of MTBE and <br /> groundwater samples from well MW6a contained detectable concentrations of TBA. <br /> Groundwater samples collected from wells MW1, MW2, MW4, MW7a and MW7c contained <br /> detectable concentrations of 1,2-DCA. Analytical results are summarized in Table 4. <br /> lsoconcentration maps are depicted in Figures 12, 13, and 14. <br /> ' 5.0 RECOMMENDATIONS <br /> ' Concentrations of petroleum hydrocarbons in samples collected from the shallow groundwater <br /> zone on-site remain elevated. Concentrations of petroleum hydrocarbons in samples collected <br /> from the deep groundwater zone are elevated on-site. <br /> Concentrations of TPHg and TBA detected in theroundwater <br /> g sample collected from MW6a � <br /> indicate the hydrocarbon plume extends off-site in the shallow aquifer. Concentrations of BTEX, <br /> MTBE detected in the groundwater sample collected from MW6b, MW7c, MW9c, and MW10b <br /> indicate the hydrocarbon plume extends off-site to the east and in deeper groundwater. <br /> ' ATC recommends that quarterly monitoring and sampling of the on and offsite groundwater <br /> wells be continued. <br /> 1 <br /> S:\Enviromental126823-JamaAreportshum.doc 7 <br /> 1 <br />