SU0008976 SSNL - Laserfiche WebLink

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r2 This nitrate concentration has originated from agricultural inputs, nitrogen mineralization and natural formations. The Ruiz's have a reverse osmosis system on their kitchen water supply, so all water consumed or used for cooking is below the MCL. The agrichemical DBCP was non-detect(ND). As depicted on the Tentative Parcel Map, and the fact the property is farmed, the topography of the site is relatively level. Therefore,any future septic system design criteria for slopes do not have to be considered. (§3.1,3.2,3.3, and 3.4) The septic system that serves the existing Ruiz residential structure has been functioning properly without any problems since it was installed in 1974. This may be attributable to the indigenous sandy/silty soils at leachline and deeper depths, as evidenced by the obtained percolation test results. (§ 3.4) The subject property is in an area designated as"High Water Table AreasK�"by EHD's map denoting the various soil types and septic system requirements throughout the County. However, as referenced below, the water table is significantly deeper in this locale than it is further to the northeast, where it is much shallower. EHD requirements in this area are leachlines and sumps, with an equivalent of 100 feet of leachline per bedroom. (§ 5.4) Since the water table is at a medium depth in this area at approximately 35 feet(discussed in the following Section), and the fact that the shallow(42") soil characteristics are fairly adequate for acceptable effluent management, sumps can be considered for installation in this area instead of seepage pits. SSS§3.1,3.2,3.3,3.4,3.5,3.6 A review of Applications on microfiche file with the EHD, reveal that there have been two permits issued for repairs/additions to existing systems within a one-half mile radius surrounding the project site. The following Table illustrates these two r""�`- permits: TABLE 1 Permit Number Address Permit Date Repair 94-03077 3333 Lehman Rd, 6194 Add 200 ft additional drainage 66-20910 6505 Lehman Rd. 7166 Add additional drainage mom (§ 5.1 and 6.0) SOIL PROFILE AND PERCOLATION TESTING (§ 5.4) The USDA Soil Map shows the on-site soil to consist predominately of a Capay clay (#) 18). Unfortunately,the surface soil structure of the property is difficult to determine from the soil maps since the property appears to be in-between two soil maps. Typically, the Capay soil type is excessively drained with slow-to-medium permeability according to the N.R.C.S. However, a relatively rapid permeability was confirmed by the perc test results. Sufficient soil "fines" (clay particles) exist to impede rapid percolation that would occur with an extremely sandy soil. Therefore, treatment of septic effluent can take place before reaching the water table at approximately 35 feet below grade. E Page -2- Chesney Consulting