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Page two April 11, 1984 <br /> For your review, the field sheets are includ d with this report. A summary is <br /> shown below: �� <br /> �� . <br /> DEPTH T TT PERCOLATION RATE <br /> F . MIN./IN. <br /> LOT DRAINFIELD # #2 #1 #2 #3 #4 AVG. <br /> 7 A 45 42 7 11 12 16 12 <br /> 8 A 42 -- -- -- -- <br /> 9 A 48 42 30 9 11 11 15 <br /> a 48 10 8 9 � <br /> 10 A 44 50 10 14 9 9 11 <br /> B 60 15 11 13 <br /> The summary indicates the depth of mottling r nges from 3 1/2' to 5' in the <br /> areas tested. Since the terrain is rolling, curtain drain is advised to be <br /> included in the drainfield design in order to intercept runoff water from <br /> entering the drainfield area. This recommend tion was discussed with the site <br /> planner. i <br /> The summary also indicates a relatively fast ercolation rate for the fine-grained <br /> � soils at this site. It should be noted that ercolation rates do vary as <br /> - dependent on the season, precipitation, and g neral soil conditions. <br /> Because soil conditions and permeability char cteristics are variable across the <br /> site, it is recommended that the stakes defin ng the drainfield areas be surveyed. <br />