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KLEINEELDER Although there was 110 apparent overcompaction caused by construction equipment, nevertheless, it was still difficult to drill two feet using power auger equipment. As you are aware, a similar condition existed on the driving tee area where initial percolation tests indicated zero percolation. A test area was prepared by ripping approximately 2'h feet. Percolation retests in this area indicated percolation rates in the 30- to 40-minutes per inch range. Based on this information, we recommend that the proposed farmland disposal area be similarly ripped to loosen the near- surface silt and clay soils. fill from adjoining farm areas could then be used to raise grade in this area to provide a 5-foot separation between the bottom of a normal leach field, and the groundwater table. We recommend that relatively-light scraper equipment or other forms of construction equipment be used for this purpose to minimize compaction. Once this process is completed, we recommend that a percolation rate of 60 minutes per inch be used in design. The attached analytical test results indicate that the upper:groundwater in this area has very low I nitrate concentrations. It is also our opinion that de-nitrification of any waste would be large considering the clayey and organic nature of the near-surface materials. Although we have not calculated the nitrate loading, we do not believe that this issue will be a concern for the above reasons. Nitrate loading calculations will be provided at a later date. We trust this letter presents the requested information. If you have any questions or need additional information,please contact ouroffice. Respectively submitted, I KLEINFELD , INC. f t /kt�i Ron Heinzen. G.E. Regional Manager/Senior Principal RH:md cc: Scott Sullivan Cecil Dillon I f 20-1096-15/20181,996 Page 2 of Copyright 1998 Kleinfelder, Inc. December 4, 1998 1.