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hording Lawton Associates <br /> 4 k�AiiA 1{,Yf/ <br /> ALgUst 25, 1988 AUG 2 9 1988 <br /> 17060,008.03 <br /> ENVIROMENYAL HEALTH <br /> The Southland Company PERMIT/5ERViCkS <br /> 7-Eleven Stores <br /> P.O. Box 404 <br /> Pleasanton, California 94566 <br /> Attention: Mr. Hal Diller <br /> kt' <br /> Gentlemen: <br /> Interim Report <br /> Phase IV Investigation <br /> Task 3, Installation of Shallow Borings <br /> and Monitoring Wells, and Task 4, <br /> Chemical'Analyses - <br /> 7-Eleven Convenience stores <br /> F= ,1 455 west Grant Line Raid E <br /> Tracy, California <br /> INTRODUCTION <br /> This interim report presents the results of Tasks 3 and 4 of <br /> r the Phase'IV Investigation conducted by Harding Lawson Asso <br /> ciates, (HLA) at the 7-Eleven Store at 455 West: Grant Line <br /> ' Road in. Tracy. We also.present in this letter construction <br /> details:.for a 'proposed`deep monitoring well. The Plias <br /> f Ien�vestigation is se IV <br /> et forth. in HLAs proposal dated April <br /> , <br /> 1988 a - <br /> - -. <br /> The intent of the Phase IV investigation is to <br /> Central'Valley.:Regional Water Provide the <br /> Quality. Control .Board <br /> ( tWQCB). with the -information required in the Preliminary <br /> t and .Problem',Assessment Re orts. .._ � <br /> P rhe econd:.task of the <br /> Phase IV investigation was to complete a soilcxas. survey and - F. <br /> to evaluate the lateral extent of volatile hydrocarbons in <br /> indicates that the <br /> i y <br /> the. immediate area of the site. ' .The sell gas survey <br /> copresence of hydrocarbon:constituents iconfined to an area. extending' from the underground'.tank"s <br /> f north.-northeast, under.:the convenience store. No gasoline <br /> constituents were detected in Buthmann Avenue, in the area . <br /> Y • _ <br /> i ` immediately north of the convenience <br /> ' store,. or east of the <br /> underground tanks. <br /> The results <br /> of this soil gas survey `were <br /> summarized in an interim <br /> report dated .lune 20, 1988. <br /> c <br /> Engineers 1355 Willow Way Telephone and Suite 109 Arizona Colorado Texas <br /> Geoscientists Cancora,Cr3'94520 415/687-9660 Alaska Hawaii <br /> Telecopy <br /> California Nevada 415/687-9673 <br /> k`1 <br />