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iw <br /> 9 , <br /> alb <br /> Aegis Environmental , Inc. Y <br /> February 14 , 1991 NORCAL <br /> ,. Page 3 <br /> RESULTS <br /> ~ The results of the GPR survey are presented on Plate 1 . This is <br /> a plan view map of the site showing the locations of the GPR <br /> f" traverses and the anomalous areas resolved by the GPR data. Also <br /> shown are the surrounding streets and the service station build- <br /> ing. <br /> our interpretation of the GPR data resolves three north-south <br /> trending anomalies that coincide with the locations of the UST's. <br /> These anomalies do not reflect the exact dimensions of the tanks, <br /> but appear to be related to utilities and variations in the <br /> I backfill overlying the tanks. In addition, the areas north and <br /> south of the UST's appear to be anomalous. We attribute these <br /> anomalies to east-west trending utilities that flank the UST's on <br /> the north and south. Finally, our interpretation of the GPR data <br /> resolves several possible utility alignments on the east and west <br /> sides of the tanks. These alignments appear to trend generally <br /> north-south with the exception of one southeast to northwest <br /> alignment. All anomalous areas should be avoided when siting <br /> borehole locations. <br /> STANDARD CARE AND WARRANTY <br /> The scope of NORCAL's- services for this project consisted of <br /> using GPR measurements to explore for underground storage tanks <br /> (UST' s) . The accuracy of our findings are subject to certain <br /> limitations inherent to the techniques used. Under unfavorable <br /> site conditions, some buried objects may go undetected. However, <br /> we performed our services in a manner consistent with the level <br /> of skill ordinarily exercised by members of the profession cur- <br /> rently employing similar methods. No other warranty, with re- <br /> spect to the performance of services or products delivered under <br /> this agreement, expressed or implied, is made by NORCAL. <br /> We appreciate having had the opportunity to provide our services <br /> to Aegis Environmental, Inc. on this most interesting project. <br /> If there are any questions, please do not hesitate to call . <br /> Yours very truly, <br /> 1 NORCAL Geophysical Consultants, Inc. <br /> William. E. Black <br /> Geophysicist,. GP-843 <br /> WEB/jh <br /> Enclosure: Plate 1 <br />