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(§ 4.2) Any of the above land use could create environmental concerns that may be discovered in <br /> the future. This may be presumably from agricultural inputs, and will be discussed in Conclusions <br /> Section of this report. <br /> i <br /> (§ 3.1) There i nl one se is system currently on the property, located at the house in the <br /> southwest corner of perty. There may have also been a septic system at the defunct milk <br /> bam. Septic system design criteria for slopes do not have to be considered. <br /> (§ 3.4) The subject property is on the border of the areas designated as "Hard Pan" and "Sand/ <br /> Sandy Areas"by EHD's map denoting the various soil types and septic system requirements <br /> throughout the County. North of the Lone Tree Creek, the soil is designated hardpan. South of <br /> Lone Tree Creek, signated san("y. ue to this proximity to "hard pan"areas, and- <br /> the depth tot water table at pprcximatel 55 ft low grade as discussed below, deeper septic L <br /> system manage t stru s such as sump seepage pits are installed in this locale. <br /> (§ 3.2,3 3,3Srtudy <br /> 3.6)/review of Application Permits on microfiche file at EHD reveals <br /> there have belications for Repairs/Additions/Replacements to septic systems within the <br /> one-half milarea on Lone Tree Road exclusively. (§ 5.4) This can be considered a <br /> very low number of Repairs/Additions/Replacements, and can be attributed to not only the <br /> extremely low density housing within the study area, but also the indigenous permeable soil type <br /> that is found in the shallow and deeper soils, particularly south of Lone Tree Creek. <br /> (§ 5.1 and 6.0) SOIL PROFILE AND PERCOLATION TESTING <br /> (§ 5.4) The USDA Soil Map shows the on-site soil to consist of three distinct soil type <br /> classifications, as illustrated on the USDA Soil Map in Appendix 2: Jacktone clay (#180) which is <br /> found in the northwest quarter of the property, Madera sandy loam (#193) which extends as a <br /> "finger"through the middle of the property, and Manteca fine sandy loam (#196) which is near the <br /> southern one-quarter of the property. The Jacktone soils are silty clays, while the Madera and <br /> Manteca series soils are silty sands/sandy silts. <br /> Percolation tests for all four proposed Parcels were conducted in the Manteca fine sandy loam soil. <br /> Typically, this soil type down to five feet is well-drained with moderate-to-rapid permeability. <br /> This was observed in all of the shallow test results. In addition to the shallow perc test results, the <br /> deeper tests also exhibited excellent permeability. Sufficient soil "fines" exist within the <br /> encountered soil to impede very rapid percolation, which would occur with a sandy soil. <br /> Therefore, treatment of septic effluent can take place within this soil environment before reaching <br /> the water table. / <br /> (§ 5.2,5.3,and 5.4r A Log of Boring using the Unified Soil Classification System (USCS), as <br /> observed from the deep perc test borings completed on each of the four proposed Parcels is found <br /> on the EHD PERCOLATION TEST DATA SHEET. Generally, the underlying soils show a sandy <br /> silt. No cemented silts hardpan/plowpan was encountered in any of the test borings. <br /> Page-3- <br /> Chesney Consulting <br />