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r <br /> r <br /> SA <br /> Aegis Environmental , Inc. NORCAL <br /> February 14 , 1991 <br /> Page 3 <br /> RESULTS , <br /> r+ <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 /> y <br /> 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 ilSVs. <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 /> backfill overlying the tanks. In addition, the areas north and <br /> south of the UST's appear to be anomalous. tie 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 114 <br /> f using GPR measurements to explore for undergrollnd storage tanks <br /> (UST' s) . The accuracy of our findings are subweia to certain <br /> limitations inherent to the techniques used, Under unfavorable <br /> 1 site conditions, some buried objects may go undetected. however, <br /> we performed our services in a manner. consists6t with the level <br /> of skill ordinarily exercised by members of the profession cur- <br /> ntly employing sim <br /> } reilar methods. No other warranty, with re ; <br /> spect to the performance of services or products delivered under g <br /> this agreement, expressed or implied, is made by NORCAL. <br /> We' appreciate having had the opportunity to Provide our services F <br /> to Aegis Env.ironmentstionsc. on leaseis most do not hesitate <br /> call , <br /> ng project. <br /> If there are. any quo p <br /> Yours very truly, <br /> NORCAL Geophysical Consultants, Inc <br /> � i William E. Black- <br /> - — - -- -- - --—---- ------ <br /> Qeoph- -i ci st-i.GP-8b-3 ----- <br /> t, <br /> WEB/jh ` <br /> Enclosure. Plate 1 : <br /> 35.. s <br />