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Groundwater Investi a.:ion <br /> Presence of Petroleum Hydrocarbons <br /> The presence of petroleum hydrocarbons was detected inToltwo of Total <br /> three groundwater monitoring wells. <br /> Xylenes, and Oil and Grease were detecteedd in monitoring well MW-1. <br /> Oil and Grease was detected in monitoring well MW-2. The presence <br /> of petroleum hydrocarbons were not detected in groundwater samples <br /> collected from monitoring well MW-3. <br /> was detected at a concentration of 1500 ppb in a groundwater <br /> TPHg r well MW-1. The lateral distribution of TPHg <br /> sample from monitoring TPHg <br /> detected ir, the groli:idwater is shown in Figure 14, <br /> Concentration Plan Map (TRater) . <br /> TPHd was detected in groundwater samples collected from monitoring <br /> ppbr <br /> wells. MW-1 and mW a estimated concentrations <br /> distribnt in0 <br /> on of TPHd n the <br /> respectively. Th TPHd Concentration Plan Map <br /> groundwater is shown in Figure 15, <br /> (Water) . <br /> of 6.0 <br /> Toluene and Total Xylenes were <br /> n taCgroundwateresampleons collected <br /> ve <br /> ppb and 2.0 ppb res well ec1. y <br /> from monitoring <br /> Of 0-5 <br /> ion <br /> Total oii and Grease was detected at <br /> collecconce tedtfr m monitoring <br /> { tration Plan <br /> tection limit} in groundwater same <br /> anGrease Concen - <br /> wells MW-1 and MW-2. Figure 16, Oil 1 distribution of Total oil and Grease <br /> Map (Water) , shows the latera <br /> detected in the groundwater samples. <br /> in the <br /> The reported conce dog exceed Action Levels <br /> (ALS <br /> ns of Toluene and Maximum <br /> groundwater samples <br /> Contaminant Levels (NGLs) . No AL or MCL has been established for <br /> Total Petroleum Hy <br /> drocarbons. <br /> Because of the scarcity of data, it was not possible to estimate <br /> contours for petroleum hydrocarbons in the <br /> iso-concentration <br /> 14-16 indicate only the concentrations <br /> groundwater. Figures collected <br /> detected in with9 the direction samples <br /> ground a er from <br /> in monitoring <br /> lto <br /> well along <br /> indicate the probable direction of contaminant movement. <br /> oils <br /> st <br /> The. presence of,. high concen rouhdwater contamination of'. contaminatedsdetect1 an <br /> that ;at. least .some-of the. gavailable soi <br /> oig� ated. tram : on-site .. sour.ces:. Tgroundwater contamination <br /> groundwater:<data also., indicate that the <br /> plume. likely extends off site. <br /> PAGE 20 <br /> 275 GRANT LINE ROAD <br /> E <br />