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manufacturer prior to filling the cell with soil The HDPE liner, which was held in between the two hay bails, contained all soil and any leachate which might be generated from excess irrigation water 4 2 4 2 Qperation and Maintenance After all excavated soil was distributed throughout the cell, the temporary irrigation system was set up, fertilizer was applied and the soil was tilled Water was supplied to the biotreatment cell via a 3 inch main line which distributed water throughout the cell through 2 inch aluminum sprinkler pipe At the beginning of the treatment period five hundred pounds of granular fertilizer containing a slow- release form of nitrogen (24%), phosphorus (4%), potassium (12%), and iron (591;), was applied throughout the surface of the cell, and incorporated by tillage Tillage of the biotreatment cell was performed on a regular basis, every 10 to 14 days throughout the treatment period When the soil was to be tilled, the aluminum irrigation pipe was disassembled and ' moved outside the cell The: soil was then rototilled or disced, and the aluminum irrigation pipe reassembled The soil was tilled to a depth of approximately 6 to 12 inches ' Irrigation was applied to the biotreatment cell every three days during the treatment period The irrigation system was controlled by an automatic timer which applied water for one hour every three days This rate was chosen based on average daily evapotranspiration in the city of Stockton (U C Agricultural Experiment Station, 1987) to avoid saturated conditions within the cell With the HDPE ' liner in place, and the light but frequent irrigations, dust was suppressed, no excess leachate was generated, and therefore all material was contained within the treatment area throughout the treatment period 4 2 4 3 Biotreatment Cell Sampling and Analysis TPH concentrations in soils in the biotreatment cell were measured on a regular basis starting at ' the end of August, 1990 The statistical and sampling procedure used to assess the concentrations of TPH in the treatment cell were based on procedures described in "Test Methods for Evaluating Solid Waste" (SW-846, USEPA, 1986) Seven random samples were collected from the biotreatment cell from a grid ' which divided the treatment cell into 100 subsection approximately 20 by 20 feet by 1 5 feet thickness (approximately 22 cubic yards) Three subsamples were composited from each of the randomly chosen ' subsections Average concentrations of TPH/D in soils_varied from 1,164 to 708 mg/kg measured by EPA Method 8015, and the sampling procedures described above A summary of these and other analyses of the excavated soil are attached as Appendix K in the waste evaluation report submitted to BFI Landfill in Livermore, California, a Class 11 landfill SAC36 046 19