SITE INFORMATION AND CORRESPONDENCE_1985-1997

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Mr. Theodore I. Wittmayer, Attorney at Law September 28, 1992 Stone Brothers and Associates Page 4 samples from boring B-9 showed elevated levels of TPH-G from 15 feet to the boring total depth of 30 feet below grade. Samples from this interval also contained elevated levels of total recoverable petroleum hydrocarbons (TRPH) and certain aromatic compounds such as acetone, toluene, xylenes and ethylbenzene. The EAI report states that the elevated hydrocarbon levels in B-9 bear the chemical signature of heavy naphtha, a compound used as a solvent for "softening rubber, oils, greases, bituminous paints, varnishes, and plastics. . . ," among other uses. The report also states that "the C8 concentration is only 106 ppm which will rule out gasoline as the contaminant." The report attempts to support this contention with chromatograms of some of the soil samples and of gasoline and heavy naphtha analytical standards. WESTON chemistry staff reviewed this data and concluded that there is insufficient information available in the report to fully support EAI's argument. While additional work could be done by WESTON or others to further evalt4ite the chemical data, there are other fundamental questions which arise from a review of the E 1I data. One of the main questions which arises, and a main problem with the argument that the hydrocarbon presence is not the result of a gasoline leak or spill, is the fact that the hydrocarbon presence is located almost directly below a gasoline fuel island in the vicinity of product�iping, which would suggest that the most likely potential contaminant would be gasoline. Furthermore, there is no known historical use of naphtha at the gas station, although this could be explored further with Montgomery Ward Auto Service Center. Furthermore, the elevated hydrocarbon levels in B-9 are corroborated by analytical results from previous hand auger boring samples collected adjacent to the pipeline and approximately eight feet from boring B-9 in sample PL-7. The PL-7 sample contained 844 mg/Kg of TPH-G and various concentrations of other compounds which are constituents of gasoline. It is WESTON's opinion, based on the evidence available at this time, that the elevated) levels of TPH-G and other compounds found in boring B-9 are most likely the result of a gasoline leak or spill from the product piping or product dispensing activities. SUMMARY WESTON's review of the EAI report is summarized below: Area I • Soil samples from borings B-7 and B-8 indicate that there is no significant hydro arbon presence down to the boring total depth of 30 feet below grade in those location;. RMMN MYR-1w