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_ 6f p <br /> k:3 Lammersville School [District 202/899-7004 <br /> July 16, 1990 15 <br /> 7 <br /> TABLE= 6 <br /> LABORATORY ANALYSIS OF GROUNDWATER (ppb) <br /> (samples obtained 6121190) <br /> i ^ <br /> Well <br /> I.D. TPH-G TPH-D Benzene Toluene Ethvibenzene Xylenes <br /> tY <br /> M4V-1 18 <10 <0.3 <0.3 <0.3 <0.6 <br /> i MW-2 3,400 <1015 6 37 8 <br /> MW-3 21 <10 <0.3 <0.3 <0,3 <0.6 <br /> MW-4 17 <10 <0.3 <0.3 <0.3 <0.6 <br /> MW-5 30 <10 <0.3 <03 <0.3 <0.6 <br /> MW-6 17,000 <10 4,800 830 1,400 2,800 <br /> MW-7 33 <10 <0.3 <0,3 <0.3 <0.6 <br /> MW-8 19 <10 <0.3 <0,3 <0.3 <0.6 <br /> i <br /> 8.0 CONCLUSIONS <br /> Results of BTEX and TPH-G analyses performed on the soil samples collected from MW-6,MW-7, <br /> and MW-8 revealed tha presence of benzene,toluene,ethylbenzene,and xylene at concentrations of 0.39 <br /> ppm, 0.07 ppm, 0.12 ppm,and 0.28 ppm, respectively, and TPH-G at a concentration on 4 ppm in the <br /> sample from MW-6 only. The soil sample collected from MW-6 was obtained just below the surface of the <br /> water table; therefore, the presence of these compounds may be attributable to their presence in the <br /> groundwater from this well. None of the soil samples obtained from h4lN-7 and f47W-$, and from MW-1 <br /> through MW-5 drilled during the previous investigation, contained petroleum hydrocarbons. <br /> Analytical results of the groundwater sample obtained from MW-6 (located downgradient of the <br /> gasoline fuel dispensers) revealed the presence of benzene, toluene, ethylbenzene, and xylene all <br /> exceeding their respective drinking water MCLS. Additionally,the grounmvater sample collected from MW- <br /> J GROUNMIATER <br /> TECHNOLOGI,INC. <br />