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TABLE 4 <br /> SUMMARY OF GROUNDWATER ANALYTICAL RESULTS(TPHd and BTEX) <br /> Vernalis Pump Station <br /> 35500 Welty Road <br /> Vernalis, California <br /> Concentrations reported in micrograms per liter(pg/L)unless noted <br /> Sample Date Ethyl Total <br /> ID Collected TPHd TPHdsg TPHg Benzene Toluene Benzene Xylenes <br /> 05 <br /> SB-22 5/17/05 780 <150R <50 0.5 2.0 <0.5 <0.5 <br /> SB-23 5/18/05 560 <150R <50 <0.5 <0.5 <0.5 <0.5 <br /> SB-25 5/19/05 660 240 <50R <0.5R <0.5R <0.5R <0.5R <br /> SB-30 5/16/05 <150 NA <50 <0.5 <0.5 <0.5 <0.5 <br /> SB-36 5/16/05 <150 NA <50 <0.5 <0.5 <0.5 <0.5 <br /> Abbreviations: <br /> <Analyte not detected above the laboratory reporting limit shown. <br /> NA=Not analyzed <br /> R=Rejected. The result is unusable. <br /> TPHd=Total petroleum hydrocarbons quantified as diesel(Clo-C25) <br /> TPHdsg=Total petroleum hydrocarbons quantified as diesel with a silica gel-preparation procedure <br /> TPHg=Total petroleum hydrocarbons quantified as gasoline <br /> WQOs=Regional Water Quality Control Board(Region 5)Water Quality Objectives <br /> Notes: <br /> 1. Samples were analyzed by Lancaster Laboratories,Inc. TPHd were analyzed using EPA Method 8015 Modified. TPHd <br /> analysis was performed both with(TPHdsg)and without a silica gel-preparation procedure. Benzene,toluene, <br /> ethylbenzene,and total xylenes were analyzed using EPA Method 8260B. <br /> 2. Groundwater results were compared to the WQOs for contaminant delineation purposes. <br /> 3. Results presented in bold exceed WQOs. <br /> 4. WQO that prohibits toxic chemicals in toxic amounts. <br /> 5. WQO that prohibits adverse tastes and odors or nuisance conditions. <br /> Page 1 of 1 <br />