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TABLE 1 PERCOLATION TEST RESULTS AND RELATED DATA FxtsTmc PAacrr,t. EXISTING PERC TEST DEPTH POST SOAK PERC TEST ACREAGE PERIOD RESULTS STATUS Parcel 207-300-14 10.0 f Acres ( 40 ches No Standing 125 rnin/in 3300 s.f. House: Water in Hole FAIL Leachline and Seepage Pit requirement dependant 300 I hes(25 ft) No Standing 4.5 min/in upon number of bedrooms \ Water in Hole (§ 4.0) LOCAL GROUNDWATER INFORMATION (§4.1) The 1999 Lines of Equal Depth Map and the 2003 Lines of Equal Elevation Map published by the San Joaquin County Flood Control illustrate the groundwater depth to be approximately 75 ft deep and the flow in a northeasterly direction. These maps are illustrated in Appendix A. The domestic well for the proposed house has not been drilled yet, but its tentative-l�a`t�rrik illustrated on the Site Plan. Therefore, Sections §4.3, 4.4,4.5 and 4.6-are not applicable. (§ 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 i 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. T -shauQlw soils at leachline depth will initially accept effluent water, but will quickly becgfiie saturate&leading to no-permeability, as evidenced by the shallow perc test results. (§ 6.7) No prob s are anticipated for this septic system, other than typical lifespan concerns. An engineered ptic sy tem will not have to be installed for this Parcel unless there are continual failures. a 50% r lacement area can be located directly west of the proposed leachfield area. If high water ows anticipated from the residence, consideration should be given to enlarging the septic system w en 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 seepage pit depth, as determined in the 25 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