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June 3, 2004 NOA Project Number: E04049A f Table 5. Summary of Percolation Tests. Test No., Percolation Percolation Rate Test Comment I, Date Tested Test Depth(ft) (minutes/inch) Duration ` P-1 shallow,5-20-04 2.75 — 4 hr No movement,failed. (Phase 1) `, P-1 deep,5-20-04 22.77 16.7 4 hr Achieved satisfactory (Phase 1) percolation rate. P-2 shallow,5-28-04 2.81 250 4 hr Failed. L' (Phase 11) P-2 deep,5-28-04 23.10 22.7 4 hr Achieved satisfactory Y. (Phasepercolation rate. Notes: A satisfactory percolation rate for a"shallow"test is less than or equal to 60 minutes per inch. LA satisfactory percolation rate for a"deep"test is less than or equal to 30 minutes per inch. 6.5 Discussion of Percolation Tests As a result of the percolation testing, both areas evaluated demonstrated a satisfactory percolation rate in accordance with the requirements of the EHD. 6. The Site appears to be suitable for leach line and seepage pits. We recommend that any future septic system layout follow the method prescribed in the Sewage Standards (1996) of the LEHD. We do not foresee any adverse conditions. 7.0 CONCLUSIONS AND RECOMMENDATIONS In summary, a satisfactory percolation rate was achieved in the proposed septic disposal areas ' of both phases of the project. No ground water was encountered in any of the borings drilled ` on the property, and the depth to ground water is approximately 60 to 75 feet below the ground surface for the period of Fall 1998 and Spring 1999. The on-site water well was tested for nitrate and DBCP. DBCP was non-detectable, and nitrate was found at 6.02 mg/L-N031 well below the maximum contaminant limit of 45 mg/L-NO3. Based on the results of this study, our office has found the soils to be suitable for a standard septic system with leach lines and seepage pits for the Site. We recommend that the design and installation of the septic system follow the requirements established by the EHD. t 11 L