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<br /> 77-045
<br /> � Brauer f Assoc. . Inc. -3• February 24, 1977
<br /> Percolation tcsts inlicatin� the soil absorptivitiea ia
<br /> minutes per inch (rapi) arc as follows.
<br /> i
<br /> � Surface Soil at iiate
<br /> Te__st M E:ev_atio_n Test Denth m i
<br /> � Lot S P-1 101.4 Silty Sand (SM) 42
<br /> � p-2 102.2 Silty Sand (SM) 1�
<br /> p'3 98.4 Silty Sand (SM) 16
<br /> p'4 99.3 Silty Sand (SM) 14
<br /> p'S 96•S Silty Sand (SM) 9
<br /> � p-b 96.5 Silty Sand (SM) 9
<br /> Lo= P-7 . 106.6 Silty Saad (SM) 25
<br /> � p-8 lOS.7 Silty Sand (SM) 2p
<br /> P-9 103.9 Silty �and (SM) 2p
<br /> P-10 102.7 Silty Sand (SM) 23
<br /> P-11 99.0 Silty Saad (SM) l�
<br /> P-12 97.1 Silty Sand (SM) 22 •
<br /> The average percolation rate for the six tests tsken in Lot
<br /> S then is 18 mpi. T f the six percolation tests���(s
<br /> taken in, Lot 4 is t n 21 mpi.
<br /> ItECOi�►lENDAT I ONS: " �� ��� �
<br /> . �
<br /> You have indicated that 3-bedroom single faatily dwellings
<br /> are proposed for the lots.
<br /> � Based on the resuYts of the soii boriags and tha;�percolation
<br /> tests, it is our opinion that soil,; Water,;,,;tabls;,° and soil
<br /> absorptivity conditions encountered�ar�,�ttitab, for�installa-
<br /> tion of in3ividual sanitary systems i"th a d�a�„#ield as
<br /> the soil absorption unit for each of the lots. �
<br /> A minimwa of 200 square feet of abaorp�, '` eA `` eT�'badroo�
<br /> will be required on each lot, based on.th�e��asured rstes. For
<br /> � the proposed 3-bedroom homes, a minimus;,,of 600 square feet •
<br /> of absorptive area will be required. I�. is our opinion that
<br /> the underlying soils are in a stata somexhat drier than
<br /> normal and durin� periods of noraial conditions� percolation
<br /> rates may be somewhat higher. For this roason, we would �
<br /> � recommend a minimwn of 800 squara feet of absorptive area
<br /> for each lot. This requirement could be met by four 30-inch
<br /> wide trenches� 80 lineal feet in length each. Mith 7-foot
<br /> center to center spacing.
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