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ENVIRONMENTAL AGE ENERGY MINERALS ANANIA GEOLOGIC ENGINEERING RAINBO BAKING COMPANY'S PERMANENT CLOSURE OF 10,000 GALLON UNDERGROUND FUEL STORAGE TANK AT THE 906 TOMMYDON FACILITY IN STOCKTON, CALIFORNIA November 18, 1988 AGE Project No. 025-88-068 Rainbo Baking Company has complied with all of the permanent closure requirements for underground storage tanks in accordance with Title 26, Division 23, Section 2672 of the California Code of Regulations. The tank was removed on September 30, 1988, by Franklin Maintenance & Equipment Company. A tank closure permit and disposal certificate were filed with the San Joaquin County Local Health District (Attachment A). The excavation appeared clean with no perceptable soil discoloration and only a very slight odor of gasoline was present. Soil types in the excavation included silty sand and clay layers. There were no indications of leaks. In compliance with local regulatory guidelines, two grab soil samples were taken from the backhoe bucket excavated from each end of the tank, approximately two feet below the excavation bottom. The samples were placed in glass jars, labelled, and transported in an iced container under proper chain of custody protocol, to ANLAB, a California Department of Health Services certified laboratory. Copies of the analytical results, chain of custody record, sample location map and tank excavation form are included as Attachment B. The samples were analyzed for benzene, toluene, xylene and ethyl benzene by EPA Method 8020, total petroleum hydrocarbons (TPH) by EPA Modified Method 8015, and total lead. The certified analytical results show soil in the vicinity of the tank is clean. TPH concentrations were not detected at levels above 10 parts per million (ppm) and total lead concentrations were reported as 13 and 16 ppm. The sample from the north end of the tank excavation (Tank 1A) had less than 0.03 ppm benzene, 0.12 ppm ethyl benzene, 0.04 ppm toluene and 0.35 ppm xylene detected. The sample from the south end of the tank excavation (Tank 113) had concentrations of less than 0.03 ppm benzene, ethyl benzene, toluene and xylene. Based on the analytical results, no further action is required at this site. Prepared by: A Date: 11 elle Mary Scruggs, 64logist and Project Manager I hereby certify that the above described work was performed under my direct supervision. In addition, the soil in the vicirij.€ orementioned underground fuel tank at the Tommydon facility, requires f(Wty�tlb!�e based upon the analytical results reported herein. Certified by: AGE Date: 144735THS�E��(O�,LI FOR N I A. 95816 PHONE(916)451-0921