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Lannersville School District <br /> 202/799-81221 <br /> July 28, 1987 <br /> SUBSURFACE CONDITIONS <br /> During the drilling of monitoring wells 1 and 2. moderate <br /> product odors were noted at about 7 1/2 to 8 feet below the <br /> ground surface . These odors decreased with depth until no <br /> product odors were noted at a depth of 10 feet . The odors, where <br /> present , corresponded with photo-ionization detector ( PIDj <br /> readings taken from the collected samples which ranged from 0 to <br /> 142 parts per million (ppm) (see Appendix i , Dril ' Logs ) . <br /> Laboratory analyses of the soils obtained from the soil <br /> borings drilled on .lune 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 /> Report) . <br /> Laboratory analyses of water sanples 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 MSV 2 , <br /> Additionally, benzene coicentrations ranged from 1 .3 to 664.0 <br /> ppb. The laboratory test results are summarized in Table 2 <br /> and the laboratory report is presented in Appendix III . <br /> 14 <br />