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October 13 , 1988 Page 5 <br /> Chevron U. S .A. 16000-105-03 <br />• CONCLUSIONS <br /> 3 � <br /> Based upon review and interpretation of the data <br /> obtained in the field at the time of the soil vapor survey , <br /> ` coupled with field observations and discussions with the <br /> ° facilities employees at the time of the field investigation , <br /> the following general conclusions have been developed and are <br /> summarized for your consideration as follows <br /> d <br /> - The data obtained from the soil vapor survey <br /> t conducted at the subject property has been <br /> interpreted as suggesting non-detectable levels of <br /> petroleum hydrocarbons contamination in all soil <br /> vapor survey locations , at the depths and locations <br /> tested , with exception of the VP-7 soil vapor survey <br /> sampling location. <br /> The results of the soil vapor analysis conducted on <br /> the sample obtained from the VP-7 sample location <br /> had shown the presence of benzene and toluene . The <br /> VP-7 sample location was situated near the eastern <br /> end of the northernmost dispenser island , in an area <br /> purported to have recently sustained a surface spill <br />. of a small amount of unleaded gasoline <br /> a The soil vapor survey is a relatively generalized <br /> assessment of trends suggested by interpretation of data <br /> obtained in the field at the time of the investigation. The <br /> } soil vapor survey' s objective is to provide cursory <br /> information to be utilized as a planning tool for possible <br /> future investigation of subsurface contamination as <br /> interpreted from the cursory soil vapor survey assessment . <br /> However, this type of investigation is characterized by the <br /> calculated risk that the presence , full nature and extent of <br /> contamination may not be fully disclosed by the methods used <br /> s. <br /> Dames & Moore warrants that its services have been <br /> performed within the limits prescribed by the Client , in <br /> accordance with current generally accepted principals and <br /> practices of civil and geotechnical engineering and <br /> engineering geology. No other warranty or representation , <br /> either expressed or implied , is included in this report . <br /> ry <br /> s The conclusions and recommendations presented in this <br /> report are professional opinions based on the indicated data <br /> described in this report . They are intended only for the <br /> purpose , site location and project indicated The conclusions <br /> and recommendations presented in this report are based on the <br /> assumption that subsurface conditions do not deviate from <br /> those observed during our study , as described in this report . <br /> It should be recognized that this study was not intended to <br /> be a definitive study of contamination at the site Other <br />