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78-046 <br />' B. J. Builders <br />-3- <br />March 3, 1978 <br />Surface <br />Soil At <br />Rate <br />Test M <br />Elevation <br />Test Depth <br />(mpi) <br />P-7 <br />99.0 <br />Clayey Sand <br />(SC) <br />60 <br />P-8 <br />98.0 <br />Clayey Sand <br />(SC) <br />11, <br />P-9 <br />98.0 <br />Clayey Sand <br />(SC) <br />22 <br />P-10 <br />97.5 <br />Clayey Sand <br />(SC) <br />34 <br />P-11 <br />97.5 <br />Clayey Sand <br />(SC) <br />60 <br />P-12 <br />97.5 <br />Clayey Sand <br />(SC) <br />10 <br />' *No water movement <br />was observed during <br />the test process. <br />RECOMMENDATIONS: <br />As can be seen from the above tabulation, the initial tests <br />averaged well above the 60 mpi rate required for a suitable <br />drainfield. However, the average of the 6 additional perco- <br />lation tests is 34 mpi. At a rate of 34 mpi, a minimum of <br />260 square feet of absorption area per bedroom is required. <br />For the proposed 5-bedroom house, the total required absorp- <br />tion area would then be 1300 square feet. This can be <br />provided by a total of 6 drain lines, each 87 feet in length, <br />30-inches in width, and spaced 7 feet center -to -center. uur <br />recommended design system is also shown on the attached <br />sketch. <br />If you should have any further questions regarding these <br />data, kindly contact us at your convenience. <br />Very truly yours, <br />UN ENGINEERI EST�ING,, INC. <br />Dennis M. Rietschel <br />Engineering Geol ist <br />�, <br />r <br />Vice President - Engineering <br />DMR/CGK:skh <br />The content of this report and supporting documents are lot the esUusrve use of the addreaee In the absence of our prior wri uen approval <br />we make no representation and assume no responsibility to any other parties regald•ng such content <br />BRAUH <br />ENGINEERING TESTING <br />