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VF{, _::.. - ayHER re Ms.Diane Lundquist October 8,1990 Page 2 TABLE I Sad Boring Soil Sample AaWyLical Results(ppm) Sample Depth Ethyl- Ln=lion -helyw grade) Benzene Toluene benzene Xvlen-< r n MW8-2 25 0.74 0.23 0.045 0.54 6.0 MW8-3 30 032 0.036 0.056 0.050 3.0 MW9-1 20 42 350 60 420 4,400 MW9-3 30 035 1.2 0.60 5.0 69 °Tota]petroleum hydrocarbons as gasolin, soil samples obtained from the monitoring well.soil borings were field-analyzed for the presence of petroleum hydrocarbon vapors with aflame ionization detector (M). 1 M screening results are indicated on the soil boring log(Enclosure B). Soil samples were selected for chemical analysis on the basis of FID scroening results and the location of the soil sample in relation to the water table. Soil samples submitted from It, boring contained detectable concentrations of TPl-L Soil samples collected from the soil boring of MW-8 at depths nf 25 and 30 feet below grade contained TPH concentrations of 6 and 3 parts per million(ppm),respectively. Soil samples collected from the soil boring of MW-9 at depths of 20 and 30:eel below grade contained TPH lececoncentrations of 4,400 and 69 ppm,respectively, Ground Water knalylical Results Ground water samples were collected and submitted for chemical analysis of BTEX and TPH concentrations on March 28 and Ally 31,1990. The analytical Iaboratory results of ground water samples collected since December 1989 are compiled in Table 2,and copies of the certified laboratory reports for the March and July 1990 sampling events are included in Enclosure E Ground water sample analytical results indicate that benzene concentrations in samples collected Pram MW-1 have increased from nondetectable to 0.0013 ppm in the period between March and July 1990. Water samples collected from MW-5 and MW-8 have also increased in benzene concentrations. The upgradient monitoring well (MW-6) has remained below detection limits for March andJuly 1990. Monitoring well MW-9 was not sampled because of the presence of a thin layer of free-phase petroleum product in the monitoring well.