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r NORCAL Geophysical Consultants,Inc. rr NORCAL i� February 14, 1991 Aegis Environmental , Inc. 801 Riverside Ave. , Suite C Roseville, California 95678 Attention: Bob Kiminerling r Gentlemen: 1. This report presents the findings of a ground penetrating radar (GPR) survey performed by NORCAL Geophysical Consultants, Inc_ at Exxon Station #7-0137 in Stockton, California. The field work was performed on February 5, 1991 by NORCAL principal geophysi- cist William E. Black. Mr. Bob Kimmerling of Aegis provided site orientation, field assistance, and background information. SITE DESCRIPTION The subject property is bordered by Center Street on the west. i ' `.. South El Dorado Street on the east, Second Street on the -north, and Third Street on the south. Three pump islands are iocated. in the center of the parcel . A convenience store is situated along the northern site boundary. Three 10,000 gallon underground storage tanks (UST) are located immediately south of the pump is- lands. The area of investigation includes that portion of the site overlying and surrounding the three UST' s. This flat, open area is paved with asphalt. 4 PURPOSE The purpose of the GPR survey is to explore the area west and east of the UST's for underground utilities or buried objects that might obstruct drilling. It is our understanding that this information will be used to help site boring locations. t , borings will be drilled at an angle in order to Samle thesoilbeneath the UST's. SCOPE OF WORK We performed 9 east-westand 7 north-south GPR tr_averses_center_ed-_--� _------- over-the--UST`s -The north south traverses are 85 to 90 feet long T � and are distributed at 2.5 to 5 foot intervals. The north-south traverses range in length from 35 to 45 feet and are distributed at 5 to 9 foot intervals. The`locations of the GPR: traverses, which amount to 1065 line feet of total coverage, are shown on Plate 1 .