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November 20, 2003 ` Job Number: LE03-421 Page 10 Table 5. Summary of Percolation Tests. Test No., Percolation Percolation Rate Test Comment Date Tested Test Depth(ft) (minutes/inch) Duration P-2 shallow, 11-14-03 3.25 --- 4 hr No movement,failed. (Parcel 2) P-2 deep, 11-14-03 21.81 28 4 hr Achieved satisfactory (Parcel 2) percolation rate. P-3 shallow, 11-14-03 3.56 23 4 hr Achieved satisfactory 11 Parcel 3 ercolation rate. 6. 6.5 Discussion of Percolation Tests As a result of the percolation testing,both areas evaluated demonstrated a satisfactory percolation 6- rate in accordance with the requirements of the EHD. L 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 EHD. We do not foresee any adverse conditions. �- 7.0 CONCLUSIONS AND RECOMMENDATIONS In summary, a satisfactory percolation rate was achieved on both new parcels. No ground water was encountered in any of the borings drilled on the property, and the depth to ground water is approximately 130-140 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 5.51 mg/L-NO3, 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. 6- We believe that due to the large proposed parcel sizes and fine-grained soils, the use of the conventional septic systems on the property will not negatively impact the ground water quality ` of the area. We recommend that the design and installation of the septic system follow the requirements established by the EHD. �OFR50 v h � R Z O A