1979-08-09 Septic System Design Report

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79-429 ' Rebers Construction -2- August 9, 1979 ' Syste i and ASTM D2488 "Recommended Practice for Visual and Manual Desckiption of Soils". A .few representative samples were then returne, to our office for verification of field classifications by a Soils Engineer. Those samples will remain in this office for a period of 60 days to be available for your examination. The hand auger probe was checked for the presence of groundwater with the use of electrical water level detector. The initial probing was completed immediately after removal of the auger and ' once again at the time of percolation test readings, conducted approximately 24 hours later. The percolation tests were run in 6-inch diameter holes drilled to an apnrnxirate depth of 36 inches, in accordance with proce- dures re nded by the City of Orono. In accordance with those procedur. -e bottom and sides of the holes were scratched with a knife b. -c remove any smeared soil surface and to provide a natural sc-terface into which othe water may percolate. Two inches o. c - sand was then placed in the bottom of the holes to prevert uring. The holes were then carefully filled with clear water to a minimum of 12 inches over the top of the sand and allowed to soak overnight with the percolation test being conducted the following day. RESULTS: The attached log contains the results of the probe and the water level information. Soil encountered, Ln the probe include approximately 1 foot of black silty sand topsoil underlain by a clayey sand gla-ial till to the 6-foot termination depth of the probe. Groundwater was not encountered in the probe at the time of its completion nor when rechecked approximately 24 hours liter. The percolation tests indicated soil absorptivities in minutes per inch (mpi) as follows: Test Soil at Test Depth P-1 Clayey Sand, brown P-? Clayey Sand, with layers of fine to medium sand, bro% REMARKS: Rate (mpi) 15 10 BRAUR ENGINEERING TELTING