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2 WASTE CHARACTERISTICS 2.1 EXISTING WASTE CHARACTERISTICS In order to describe the existing waste characteristics, it is useful to understand the history of the site. A series of plates have been prepared illustrating the waste type, location, and placement of waste at the site. Plate 2-1 shows the 21-acre California Clay Products (CCP) site based on a 1963 aerial photograph interpretation and maps submitted by CCP in their 1977 application for a solid waste facilities permit. At this time, the outline of the excavation can be clearly seen but it does not appear that the excavation has reached its maximum depth of 20 to 21 feet as reported in the 1977 application for a solid waste facilities permit. This assessment of depth was made by comparing this 1963 photograph with one taken in 1973 where the depth of 20 to 21 feet had been reached. Plate 2-2 was prepared based on an aerial photograph taken in 1973. Quarrying of the pit stopped in 1967 at a depth of 21 feet and filling certain areas of the pit with inert waste (construction/demolition debris and soil) began in 1955. Much of this inert waste was generated during a renovation of downtown Stockton. Areas A, B, and D have been filled with waste but not to the surrounding ground elevation of approximately 16 feet msl. Areas A and D at this time contain only inert waste. Area B is filled with inert waste and possibly some ASW since disposal of ASW started in 1973 and was placed in the eastern three acres of the pit, which includes area B. Area C has not been filled with waste yet. A new site access road can be seen in the southwest corner of the site. Plate 2-3 shows general waste disposal areas as of 1977 based on a description of the landfill contained in the 1977 application for a solid waste facilities permit. ASW was discharged to area B during the period from 1973 to 1977. Area A still contains only inert waste and at this time is estimated to range from zero feet below the surrounding ground surface-at the southwestern end to 12 feet below the surrounding ground surface in the northern areas. Area C is still unfilled and was reported to have a depth of 20 feet below the ground surface. Borings in this area (MW-3 and CP-1) show waste being much deeper, CR4-90-25 Copyright 1990 Kteinfelder, Inc.