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f Fill pipe measurements indicate that the crowns of tanks A, C and D are at a depth of 2 feet below grade Based on the recollections of current and previous employees of Fabricare, the crown of Tank B is believed to be approximately 3 to 4 feet below grade Tank B was abandoned by Fabncare in 1974, and was filled with sand, gravel and a cement slurry mix by Fabncare employees that year The sand, gravel and cement mix was poured into the tank through the tank's fill pipe No records exist of the volume amount of cement slurry mix used. However, recollections of employees who worked on filling the tank indicate that the cement slurry mux used to fill the tank was brought up to the top of the tank's fill pipe at ground surface Tanks A, C and D were leak tested by Hunter Environmental Services Inc , Fountain Valley, California on 4 November 1986 The method utilized for tank testing was the Leak Lokator LD 2000 System The results of the leak tests conducted indicate that the structural integrity of the tanks was sound at time of testing AEMC proposed that tanks C and D be closed in-place by filling both tanks with a cement slurry mix meeting the requirements of the City of Stockton Fire Department. Because ltank B was completely filled with sand, gravel and a cement slurry mix by Fabrncare in 1974, no additional cement slurry mix would be placed in this tank. Soil samples were collected adjacent to and directly beneath both ends of the two diesel tanks using geotechnical drilling and sampling techniques Both inclined and vertical boreholes were drilled to collect the samples Locations of the boreholes, and attitudes of the inclined boreholes, are presented on Figures 3, 3A and 3B Vertical boreholes were dulled at the south end of tanks C and D due to clearance and space restrictions which precluded drilling inclined boreholes to the area of the facility. Inclined boreholes were drilled at Page 5