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. . V. <br />-223 <br />Mr. Randy- Fredrickson <br />ItESULTS : <br />The log of soils encountered <br />level observations are shown <br />sheet. <br />May 27, 1977 <br />i►t the boring and the water <br />on the attached Log; of Boring <br />The power auger boring encountered a sandy clay glacial till <br />which extended from the surface to the 12-foot depth and was <br />immediately underlain by a clayey sand to its 20-foot termina- <br />tion depth. <br />,,hen probing the boring immediately after completion <br />groundwater was encountered at the 11-foot depth. Upon <br />rechecking the boring one day later, it was noted that a <br />cave-in had occurred at the 10-foot depth, however, no <br />groundwater was encountered to above that depth. Water <br />levels should be expected to show normal seasonal and annual <br />fluctuations and should be at or near the current elevation <br />of Stubbs Bay located several couple hundred feet to the <br />south of the lot. <br />Percolation tests indicated soil absorptivities, in minutes <br />per inch (mpi) as follows: <br />Surface <br />Soil At <br />Rate <br />Test M <br />Elevation <br />Test <br />Depth <br />m i <br />P-1 <br />9b.2 <br />Sandy <br />Clay <br />(CL) <br />Z40 <br />P-2 <br />9S.9 <br />Sandy <br />Clay <br />(CL) <br />240 <br />P- 3 <br />9().1 <br />Sandy <br />Clay <br />(Cl. ) <br />240 <br />P-4 <br />91.0 <br />Sandy <br />Clay <br />(CL) <br />35 <br />P-5 <br />91..' <br />Sandy <br />Clay <br />(CL) <br />30 <br />P-6 <br />91.1) <br />Sandy <br />Clay <br />(CL) <br />12 <br />ANALYSIS $ RL-COMMENDATIONS : <br />Percolation tests indicated unsuitable results in the area <br />of P-1 through P-3 and favorable results in the area of P-4 <br />through P-6. Also, hand auger probes placed further to the <br />south to elevation 86+ revealed silty clayey sands which are <br />generally more suitable soils for a drainfield than the sandy <br />clay further north. <br />You have requested that we Jesign the proposed system based <br />on an expanded 3-bedroom house. Village of Orono "Code of <br />Minimum Standards" states that a system for single family <br />residence have two septic tanks. `Che first tank shall not <br />be less than a 750 gallon capacity and the second tank not <br />less than 500 gallon capacity. If a garbage disposal unit <br />i,� used, the first tank shall be of 1000 gallon capacity. The <br />details of the existing; 5y:tem are currently <br />being invc5tig3ted to dc-trrmine if additional BRAun, <br />tanks are n, cessary. <br />ENGlNEE1H�Ki TESTtHG <br />