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n� <br /> I.aoaersvllIt! school District <br /> 202/799-8221 <br /> July 28, Il187 <br /> SUBSURFACE CONDITIONS <br /> Duritits the fir itIini., of monitoring wr. 11s 1 and 2, moderate <br /> product odors were noted at about 7 1 /2 to 8 feet below the <br /> ground sur race . These odors dect-vaned with depth until ao <br /> j product odors were noted at a depth of ID feet . The odors , where <br /> present , corresponded with photo- io.)izatl on detector ( PID) <br /> readings taken from the collected samples which ranged from 0 to <br /> 142 part~ per million (ppm) (see Appendix 1 . Drill Logs) . <br /> Laboratory analyses of the sails obtained from the soil <br /> borings drilled on June 18, 1987 did not Indicate the presence of <br /> detectable hydrocarbon component concentrations In any of the <br /> monitoring wells at that time ( see Appendix III . Laboratory <br /> Repgrt) . <br /> Laboratory analyses of water samples recorded detectable <br /> concentrations of dissolved hydrocarbons in all five wells , The <br /> concentrations of total volatile hydrocarbons in the wells ranged <br /> from 32 .5 parts per billion (ppb) in MW 4 to. 6958 ppb in MW 2. <br /> Add itIunit IIy , benzene concentrations ranked from, 1 .3 to 664 . 0 <br /> pph. The laboratory test results are summarized in Table 2 <br /> and the laboratory report is presented in Appendix III . <br /> 14 <br />