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r 'she, ' -ax ..07 - a" a -� • y �� ° 2021899-7004 Larnmersville School District 14 July 16, 1990 _ With the exception of the soil sample obtained from MW-6,the analyzed soil samples did not contain TPH-G or ETEX above their respective method detection limits. Analysis of sample MW-6A(7 feet below ground surface)revealed the presence of TPh-i at a concentration o074 ppm. Benzene,toluene, p ethlj!`ienzene, and xylene were detected at concentrations of 0.39 m, pPj0.12 ppm, and 0.28 ppm, respectively. The soil sample analyzed from MW-6 was obtained just below the water abbalm therefore the TPH-G and BTEX concentrations detected may be attributable to the pro hydrocarbons detected in thri groundwater. Copies of the certified analytical reports are presented in Appendix 111. 7.2 GROUNDWATQ11 With the exception of the groundwater samples obtained from MW-2 and Mw6, none of the samples obtainers contained BTEX above method detection limits. Analyses of the groundwater sample collected from MW 2 revealed the presence of benzene, toluene, ethylbenzene, and total xylenes at f the groundwater sample concentratiosts Of 15 ppb,6 ppb,37 ppb,and 8 ppb, respectively. Analyses o obtained from MW-6 revealed the presence of benzene, toluene, ethylb respectively,, and t tat xylenes at concentrations of 4,800 ppb, 830 ppb, 1,400 ppb, and 2,800 ppb contaminant levels{MCL)in drinking water for these compounds,as established by the State Department of Health Services (DMS), are 1 ppb for benzene, 100 ppb for toluene, 6:30 ppb for ethylbenzene, and 1.750 ppb for xylenes. TPH-G was detected in the groundwater samples obtained from all eight monit ring l wassite. not The concentrations detected ranged from 17 ppb in MW-4 to 17,u0u ppb detected above its method detection limit of 10 ppb in the groundwater samples obtained'cram MW-1 through MW-8. Currently, no drinking water standards have been established by the DHS for TPH-G or - TPH-D. No separate-phase petroleum hydrocarbons were measured in=•^y of the eight monitoring wells on site. Results Of the groundwater analyses are presented in Table 6. Copie of the certified analytical results for the.lune 21, 1990 sampling period are presented in Appendix Ill. CROUNMIATFR -- TEICHNOLOGY !,%;C.