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1 " <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, ` S. <br /> GEOLOGICAL AUDIT SERVICES, INC. <br /> No 3475 <br /> Zf700 OF CALI� <br /> Bob Marty Victor B. Cherven, Eh. D. <br /> Project Geologi Project Geologist <br /> Registered Geologist #3475 <br />