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,�,. ,�` � • . � 77•045 Braucr $ Assoc. . Inc. •2- FQbruary 24, 1977 � The borings were probod imaediately after their co�pietfon to check for the preseace of groundwater. The borings were ; also rochecked prior to lcaving the site oa Fobruary 17. Absence of groundwatar was noted in both probings of the borings to their respactive 15-foot teraination depths. A rechock of tlie boring 1 week later also encountered no • groundwater to the 15-foot depth. The percolation tests were run in 6-inch diameter boles drilled to an approxi�ate depth of 36 inches, ia accosdaace with procedures recomiaended by the �finnesota Department of Health (MHD) and with the procedures recommended by the City of Orono. In accordanca with these procedures, the bottoa� and sides of the holes were scratched with a knife blade to remove any smeared soil surfaces and to vrovide a natural soil interface into which the water may percolate. ` Two • inches of coarse sand was then placed in the bottoat of the holes to prevent scouring. The holes were then carefully filled with clear water to a minimum depth of 12 inches over • tha top of the sand layer and allowed to soak overnight witb the percolation tests being conducted the folloxiag day. An insulation material was placed over the holes prior to leaving the site to preveat freezing of the water sad soils overnight. , RESULTS: _ The log of the soils encountered in the bosia�s and the 't` water level observati�ns are shown on the sttaehed Loa of � - Boring sheets. - Boring B•1, taken in Lot S, encount�l. } j � � silty sand �>'�.��r� luviva� , brown in color. with.,af.�t�a ,�,� ,,��'rQm .� the surface to the 7-foot depth.=� Cl`ay��aAd��i'iCf'sl �till was then encountered from the 7-foot depth to; the 15•foot terminati e t the boring. ,. � } eF, Boring B-2, taken i� Lot 4, encountered�il sYk browa�;silty • sand topsoil layer from the surface to approximately: the 4- foot depth and was immediately underlafn by coarse a�.luvitu� silty sand between the 4 and the 7-foot depth. A clayey sand glacial till was then encountered from the 7-foot depth to approximately the 12-foot depth and was in turn underlain � by a sandy clay glacial till to its 15-foot ter�ainatioa � depth. �