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Engineered Septic System The proposed leach field area on Parcels 2 and 3 failed passing acceptable percolation rates. Their results were mixed but I will use 1/8" per half hour o water o to esr a en ger d system. This rate yields 240 minutes per inch which is considerably higher than the County minimum of 60 minutes per inch. All of the surrounding parcels were able to find a permeable membrane within 25 feet deep. I would expect with further exploration, this property would support a conventional leach line and pit system. Since a strata was not encountered, this report will design a theoretical system for a future home. The theoretical home this strata will consider ` is a four bedroom house. The percolation rate is 400 min/in which equals 0.0025 in/min or 3.6 in/day. Utilizing a 4% ` factor(which is very conservative), the actual amount of percolation per day is 0.15 in/day or 0.013 ft/day. My design will utilize a filter bed with leach lines on 5 foot centers. The bed will consist of a 12" gravel bed, overlaid with perforated pipe, overlaid with 6" gravel, overlaid with paper, overlaid with native soil. The bed I am designing is a 30 foot boy 40 foot effective ed. The amount of percolation by this bed is: 100x100 = 10,000 sq ft x (0.013 ay) y = 130 cft/day ✓r�ttAvMw'�'"'*�"" J f =971 gal/day 1 This is more than sufficient for a two bedroom house. If a future home builder encounters sufficient strata with accepa e perco onra e, a conventional system may be utilized _ and this theoretical system can be ignored. X�0 00 Based on the depth to groundwater in the area, and the size of the proposed parcels, it is our opinion that the installation of any new proposed septic system, if properly installed, should not x� adversely affect the quality of groundwater in the area. /(P at 7.0 CONCLUSION SECTION The conclusions of this report are based on the information provided regarding the proposed development, the use of the subject property, and the site conditions as they existed at the time we excavated our test holes and performed the percolation tests. It was assumed that the test holes and percolation tests results are representative of the subsurface conditions in the general area. Our services were performed, our findings obtained, and our conclusions proposed in accordance with generally accepted engineering principles and practices. This warranty is in lieu of all other warranties either expressed or implied. Test findings and statements of professional opinion do not constitute a guarantee or warrant ex ressed or implied. ` O PROFESS/p4,A P� �EMURp � F m J e urphy * N . 45277 C. . 45,277 s� /VIL "9T P�\P c:b466\Soil Report Or C 1