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1 <br /> TANK CLOSURE REPORT <br /> BEACON STATION #419 <br /> 2350 WATERLOO ROAD <br />' STOCKTON, CALIFORNIA <br /> AMV PROJECT NO. 19011.03 <br /> Acton • Mickelson • van Dam, Inc (AMV), has been authorized by Ultramar Inc (Ultramar), <br /> to conduct soil sampling as required during underground storage tank removal at Beacon Station <br /> #419, 2350 Waterloo Road, City of Stockton, County of San Joaquin, California. The site is <br />' located on the southwest corner of the intersection of Waterloo Road and Sierra Lane (Figures 1 <br /> and 2) The surrounding area is comprised of both residential and commercial properties <br />' 1.0 BACKGROUND <br />' Petroleum product storage at the site consisted of three 10,000-gallon, single-wall steel, <br /> underground storage tanks (USTs) for motor vehicle fuel storage The former locations of the <br /> USTs as well as other site structures are illustrated on Figure 2 The three USTs contained <br /> various grades of unleaded gasoline, the easternmost tank contained premium unleaded gasoline, <br /> the middle tank contained unleaded plus, and the westernmost tank contained regular unleaded <br />' gasoline (Figure 2) <br /> No previous work has been performed by AMV at the subject site Three soil borings <br />' designated as SB-1, SB-2, and SB-3 were advanced by another consulting firm at the site in <br /> March 1991 (Figure 2) Eleven sod samples were collected from these borings and submitted <br /> for analysis of benzene, toluene, ethylbenzene, and xylenes (BTEX), as well as total petroleum <br />' hydrocarbons as gasoline (TPHg) Of these constituents, only xylenes were detected Xylenes <br /> were found in 3 of the 11 samples; none of the samples contained xylenes at concentrations <br /> exceeding 0 1 parts per million (ppm). It is believed that the detection of these low levels of <br /> xylenes could have resulted from tape used to secure the end caps of the sample collection tubes <br /> No benzene or TPHg was detected in any of the soil samples collected <br />' 2.0 UNDERGROUND STORAGE TANK REMOVAL <br /> AND RELATED SOIL SAMPLING <br /> 1 <br />' The UST removal was conducted by Walton Engineenng of West Sacramento, California All <br /> soil removed from the UST area during the tank removal was stockpiled on site until analytical <br /> results were received and reviewed <br />' RYMN ECD <br />