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Victor B. Cherven, Ph. <br />Project Geologist <br />Registered Geologist #3475 <br />Bob Marty <br />Project Geologi <br />28 January 1993 <br />(GeoAudit CV43F1-1.35) <br />Page 5 of 5 <br />The benzene contamination detected in the water sample may be the <br />result of leakage from the former UST on the site, although this <br />contamination could have an off-site source. <br />The source of the halogenated solvents (i. e. the TPH) is unknown. <br />Such solvents are commonly used by industrial firms for cleaning <br />and degreasing, and the contamination probably originated off-site <br />in one of the surrounding industries. The contamination may have <br />entered the groundwater through the septic system that serves the <br />building complex to the south. This system is located approximately <br />20 - 30 feet south of the monitoring well. Alternatively, the <br />solvents could have been introduced on-site via some unknown prior <br />use of the site. <br />We recommend that the well be re-sampled within three months and <br />analyzed for the presence of halogenated hydrocarbons and BTE&X in <br />accordance with EPA methods 8015, 8020, and 601. <br />LIMITATIONS <br />Our professional services were performed using that degree of care <br />and skill ordinarily exercised by environmental consultants <br />practicing in this or similar localities. The findings were mainly <br />based on analytical results provided by an independent laboratory. <br />Evaluations of the geologic conditions at the site for the purpose <br />of this investigation are made from a limited number of available <br />data points (i.e. borings) and subsurface conditions may vary away <br />from these data points. Although soil contamination was not <br />encountered, it could be present in areas not investigated by this <br />assessment. Therefore, no other warranty, expressed or implied, is <br />made as to the professional recommendations contained in this <br />report. <br />The opportunity to prepare this report is greatly appreciated. <br />Please feel free to call our office if you have any questions. <br />Sincerely, <br />GEOLOGICAL AUDIT SERVICES, INC.