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a.i TABLE 1 PERCOLATION TEST RESULTS AND RELATED DATA EXISTING PARCEL EXISTING PERC STATUS TEST DEPTH POST SOAK PERC TEST ACREAGE PERIOD RESUJS— i r Parcel 207-300-13 42 Inches No Standing 83.3 min/in Uachline and Seepage Pit 10.0 f Acres Water in Hole requirement dependant upon number of bedrooms 276 Inches(23 ft) No Standing 4.5-min/in Water in Hole PASS (§ 4.0) LOCAL GROUNDWATER INFORMATION (§4.1)The 1999 Lines of Equal Depth Map and the 2003 Lines of Equal Elevation Map pub by the San Joaquin County Flood Control illustrate the groundwater depth to be approximat 77 ft deep and the flow in a northwesterly direction. These maps are illustrated in Appendix A. As referenced, the domestic well for the house has been drilled, but there is no electricity to the p he e.)�Consequently could not be sampled. Therefore, Sections § 4.3, 4.4 4.5 and�6 are not applicab (§ 4.2) The depth to groundwater may make potential adverse impact to the underlying groundwater somewhat unlikely. This will be dependent upon the underlying soil lithology and - the amount of potential contaminants that percolate from the surface soils. (§ 7.0) CONCLUSIONS (§ 6.8) The perc test results for the subject Parcel show acceptable percolation for the management of anticipated effluent flows from the proposed house at the deeper depths representative of seepage pits. The shallow soils at leachline depth will initially accept effluent water,but will quickly become saturated leading to slow permeability, as evidenced by the shallow perc test results. (§ 6.7) No problems are anticipated for this septic system, other than typical lifespan concerns. An engineered sys m will not have to be installed for this P rcel unless there are continual failures. he 50%re acement area can be located directl orth nf the proposed leachfield area. If high water ire anticipated from the residence, consideration should be given to enlarging the septic system when it is installed. It has generally been the policy of EHD to install seepage pits even when permeable strata exists at typical sump depth, but not at seepage pit depth. In the case of this Study, permeable strata definitely exists at both the sump depth and seepage pit depth, as determined in the 23 ft exploratory boring that was used for the deep perc test boring. It will be at the discretion of EHD as to the septic system structure to be installed for this project. Page -3- Chesney Consulting