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tabulated as follows : <br /> Parcel No . Test Hole Percolation Rate Minimum Usable <br /> X10 . (Minutes Per Inch) Disposal Area <br /> ( Square Feet ) <br /> With Pits <br /> 1 SIC (3 ' ) 120 Failed <br /> 1 DID ( 13 ' 11 " ) 24 12 , 000 + Pits <br /> 2 S2 (3 ' ) 120 Failed <br /> 2 D2 ( 19 ' 08" ) 20 12 , 000 + Pits <br /> Recommendations : <br /> Soil porosity does not permit the use of a subsurface <br /> horizontal leach field solely and effluent is recommended to be <br /> discharged, in combination with subsurface horizontal leach lines <br /> into seepage pits at a maximum depth of twenty-five feet . Since the <br /> 3-foot depth percolation tests failed to meet and the deep <br /> percolation tests did conform to San Joaquin County Health Service , <br /> Environmental Health Division minimum requirements , The sewage <br /> disposal system recommended is a minimum usable 12 ,000 square feet <br /> disposal area plus pits in addition. <br /> Well Water Analysis : <br /> No well water testing is required in conformance with "The <br /> Conditions Of Approval " for the development of this subject <br /> property transmitted by letter dated August 19 , 1991 from Mr . Steve <br /> St . Sure, Associate Planner , to Mr . Ervin Kost . <br /> EnL-ineer ' s Statement : <br /> Septic systems can be installed to the density proposed and it <br /> is not expected to impact groundwater nor cause other health <br /> hazards . <br /> Walter E. Curtis <br /> Civil Engineer <br /> Attachments : <br /> Field Note Sheets ( 2 ) <br /> Parcel Map ( 1) <br />