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a - <br /> t 1 _ <br /> ®� <br /> File No. 2070-2 <br /> 19 September 198E <br /> Ra.i.nbo Bakery, Stockton <br /> WORKPLAN FOR CONTAMINATION JJIVESTIGATION <br /> Anderson Geotechnical Consultants <br /> September 1938 <br /> 1. INTRODUCTION <br /> 1. Anderson Geotechnical Consultants has been retained by <br /> Anheuser-Busch to complete the investigation of soil and <br /> groundwater contamination at the Rainbo Bakery, located at 2651 <br /> South Airport Way in Stockton, California. The contamination <br /> stems from a gasoline leak in one or both of two underground <br /> tanks located on t1lie subject site (which have been removed) . The <br /> purpose of the additional investigation discussed herein is to <br /> address the concerns of Mr. Gordon Lee Boggs, of the California <br /> Regional Water Quality Control Board (see below, section Ill) . <br /> II. HISTORY <br /> 2. Paragraphs 3-6 are based on the Contamination Assessment <br /> Report for the subject site prepared by Environmental Science and <br /> Engineering, Inc. (ESE report No. J-87-913-01170-1730, December <br /> 1987) . <br /> 3. The two underground gasoline storage tanks were located <br /> approximately 50 feet south of the baking facility's main <br /> building (see Site Plan - Figure 1) . The west tank was operable <br /> through 1986. The east tank was decommissioned (date unknown) , <br /> filled with sand, and remained underground. In December of 1986, <br /> precision tests indicated a possible leak in the west tank. <br /> Based on inventory records, the volume of gasoline which escaped <br /> was suspected to be small. <br /> 4. The soil nearby the tanks was subsequently sampled and <br /> chemically analyzed. Results of the analyses showed elevated <br /> levels of miscellaneous hydrocarbons beneath both tanks (to a <br /> depth of 28 feet) . The' tanks were subsequently emptied, removed, <br /> and :.crapped off-site. Contaminated soil surrounding the tanks <br /> was also removed. The resulting excavation was backfilled with <br /> clean, crushed rock and paved with asphalt. <br /> y <br /> 1 -1- <br />