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Sy <br /> Wiggins & Associatessto kton, California / Project 309101 July 31, 1.991 <br /> BOIL DORINGS <br /> On ,lune 24, 1991, nine {5} soil borings were drilled at the site. <br /> Borings are indicated as B-1 through B-9 in this report and on <br /> Plate 4. <br /> Barings B-3, B-7, and B-9 were placed approximately 5 to 10 feet <br /> east of surveyed locations of the three underground storage tanks. <br /> Boring B-6 was drilled approximately 20 feet west of the surveyed <br /> tank locations. Borings B-2, B-4, B-5, and B-8 were drilled near <br /> the three existing product dispensers, and the surveyed locations <br /> of related piping. Boring B--1 was placed near the north eastern <br /> limits of the site, approximately 40 feet east of the tanks. This <br /> boring was drilled for the collection of "background" and down <br /> gradient soil samples. <br /> using truck-mounted drilling equipment, Borings B-1, B-3, B-6, B-7, <br /> and B-9, were drilled by Aqua Science Engineers, located in San <br /> Ramon, California. These borings were terminated at or near water <br /> saturated zones. Borings B-2, B-4, B-5 and B--8 were drilled using <br /> '- hand augering equipment. <br /> SOIL SAMPLING <br /> Soil samples were recovered from each boring. Samples -io-r,, <br /> recovered from the borings as outlined in the TMC subsurface ::,.?1 <br /> Chemical Investigation Work Plan, dated April 15, 199?.. Specific <br /> sample depths are displayed in Attachment 1, Soil Boring Permit and <br /> Logs of Soil Barings. In borings B-3, B-6, B-7, B-9, samples were <br /> recovered at approximately five to six-foot intervals. In Bowring <br /> B-1, the first two samples were collected at 6 -- 6-1/2 and 11 - <br /> 11-1/2 feet, respectively. Subsequent soil samples were then <br /> . recovered at approximately 18 to 24-inch intervals. This sampling <br /> TMC Environmental, Inc. / San Pablo, California 5 of 11 <br /> { <br />