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V/(& .2 3. , a d 3. ) The on-site septic system that has served the Dutra residence since 1965 has been functioning properly without any problems. The permit for this original system was not found in EHD microfiche or hard copy files. �(6 The subject property is in an area designated as "Sand/Sandy"by EHD's colored map denoting the various soil types and septic system requirements throughout the County. (§ 5.4) Therefore, since the water table is shallow in this area at approximately 15 feet, and the fact that the shallow soil structure is typically adequate for proper effluent management, seepage pits are not allowed to be installed in this area. Consequently, most effluent flows are managed by leachlines in this area. Sumps may be installed under certain conditions, with a special permit from EHD. f/ 30. a d 3. ) A review of Application Permits on microfiche file with EHD reveals there have been three lications for Re airs/Additions to septic stems on Tinnin Road and no Pp P P Y Application Permits between the 5000 and 7500 blocks of West Ripon Road. (§�5.4) This can be considered a medium low number of Repairs/Additions/Replacements, and can be attributed to the indigenous silty/sandy soil type. The referenced permits can be found in Appendix D. (§ 5.1 and 6.0) SOIL PROFILE AND PERCOLATION TESTING X§ 5.4) As noted on the USDA Soil Survey map, the entire on-site soils consist of Tinnin loamy coarse sand. Typically, these soil types are well drained with rapid permeability at depths below 12 inches. This was evidenced by the percolation test results, as discussed below. (§ 5.2, 5.3, and 5.4) A Log of Boring described by the Unified Soil Classification System (USCS), as observed from a ten-foot boring completed near the perc test boring for the new Chavez home, is found on the EHD PERCOLATION TEST DATA SHEET. Generally, the soils show a consistent silty sand soil with increasing sandiness with increasing depth. No cemented silts hardpan was encountered in the ten-foot exploratory boring. For both Parcels, the percolation tests were set at 42 inches in depth, which the maximum depth of a leachline trench. ✓(§ 6.1) Percolation testing was conducted on the proposed Parcels as illustrated on the Tentative Map found in Appendix C. These test locations maintain sufficient distance between existing and future wells. Testing done on the Remainder Parcel was completed in the anticipated location of the future leachfield that will serve the Chavez's new home. The following information describes the p//reparation of the percolation test borings and the actual perc testing: /(§ 6.2, 6.3 and 6.5) On October 5, 2005, 1800 hrs, one shallow perc test boring was hand-drilled on the proposed two Parcels. The sidewalls of the test borings were scored with a pry-bar and the loose material removed. Two inches of fine gravel was placed at the bottom and three-inch perforated PVC pipe was inserted in each of the test borings. All borings were pre-saturated on October 6, 2005 at 0900 hrs with 12 inches of water. (§ 6.4) On October 7, 2005, at 0730 hrs,percolation testing commenced for both test borings. There was no standing water after the 24-hour soak period, as illustrated in Table 1 below. Consequently, EHD Perc Test Procedure#2 was conducted for these two borings. Page -2- Chesney Consulting