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Oct 06 99 14:14 No .007 P.05
•
John R. Troka
October 5, 1999
Page 4
pavement and slab areas and to at least 90% of the maximum standard
Proctor density in landscape areas. Free- draining wall backlit' should be
capped with about 2 feet of the on -site, Liner graded snits to reduce
surface water infiltration.
3) The ground surface surrounding the exterior of the building should be
sloped to dram away from the foundation in all directions. We
recommend a minimum Mope of 6 inches in the first 10 feet in unpaved
areas and a minimum slope of 3 inches in the first 10 feet in pavement
and walkway areas.
4) Roof downspouts and drains should discharge well beyond the Inuits of
all backlit'.
Percolation Testing: Percolation tests were conducted on September 16, 1999 to
evaluate the feasihiiity of an infiltration septic disposal system at the site. One profile
pit and three percolation holes were dug at the locations shown nn Fig. 1. The lest
holes (nominal )2 inch diameter by 12 inch deep) were hand dug at the bottom of
shallow backhoc pits and were soaked with water one day prior to testing. The soils
exposed in the percolation holes are similar to those exposed in the Profile Pit shown on
Fig. 2 and consist of abuts 1 foot of topsoil overlying medium stiff to stiff sandy silty
clay. The percolation test results are presented in Table 11. The results of percolation
tests P -1 and P -2 indicate an infiltration rate of about 60 minutes per inch. Test hole P-
3 had 91 inches of water front soaking the previous clay and did not pore.
Limitations: This study has been conducted in accordance with generally accepted
gcotechnical engineering principles and practices in this area at this time. We make no
warranty either expressed or implied. The conclusions and recommendations submitted
in this report are based upon the data obtained from the exploratory pits excavated at the
locations indicated on Fig. 1, the proposed type of construction and our experience in
the area. Our findings include interpolation and extrapolation of the subsurface
conditions identified at the exploratory pits and variations in the subsurface conditions
may not become evident. until excavation is performed, 1f conditions encountered
during construction appear different from those described in this report. we should he
notified at Once so re- evaluation of the recommendations may be made.
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