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For example, in 1983, the house at 10243 Small Road had a concrete septic tank7ye years later, 100 feet of leachline was installed. Mr. Barber has lived in his househe stated that there has never been a problem with his septic system. The subject property is in an area designated as"Sand/Sandy"by EHD. Therefo , water table is comparatively shallow in this area, seepage pits are not allowed to be installed, and sumps may be discouraged due to potential nitrate impact. Filter beds may be installed, particularly if there are area constraints. As discussed below, the water table is approximately at 25 below grade. There are no known tile drains under the property. SOIL PROFILE AND PERCOLATION TESTING As noted on the USDA Soil Survey map, the soil consists of a Honcut sandy loam (#175). Typically,these soil types are well drained with moderate permeability, which is a beneficial soil attribute for septic effluent management. There are sufficient soil "fines"to impede rapid percolation so treatment of effluent can occur beforereachingthe watertable, unlike what would be encountered with a very sandy soil. A Log of Boring designating the Unified Soil Classification System (USCS) soil classifications as observed from the hand-drilled percolation test borings are found on the EHD PERCOLATION TEST DATA SHEET. Generally, the soils are relatively uniform in physical characteristics, except for a thin hardpan layer found at 18-23 inches b. .s. on 1 The surface soils change color from dark brown o r t rown at approximately 24 inches below ground surface (b.g.s.). The USCS classifies this soil as SM - a sandy silt/silty sand. The soil has a low organic matter content and medium moisture content. Percolation testing was conducted on each proposed lot in the locations designated by Mr. Lagorio, as measured and illustrated on the Tentative Map. The following information describes the preparation of the percolation test borings and th�erc testin : On May 4, 1130 hours one per boring was hand-drillrA n+ p: lots 1 3 4 �4, all to a depth of 42 inches and 4.5 inches in diameter. The sidewalls of the 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. The test borings were pre-saturated with approximately 12 inches of water. On May 5,percolation testing commenced for all four borings. There was no standi wa .r in my of the four test borings after the 24-hour soak period. Althoug t e initial volume of water seeped away in the first 30 minutes at the start of the percolation tests for all four test borings, readings for the borings were taken over a four-hour test period to ensure maximum soil saturation under"worst-case scenario"conditions. The perc tests exhibited comparatively rapid percolation for all four parcels. The last half hour of the tests was witnessed by Lisa Medina of the San Joaquin County Environmental Health Department. L� Page -2- C6emey Consulting