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Drilling was monitored by a soils technician from. our staff who <br />located the drill sites, examined and classified the subsurface soils, <br />and maintained a detailed log of each exploration. The boring logs are <br />presented on Plate 2. Soils were classified in accordance with the <br />Unified Soil Classification System which is explained on Plate 3. Both <br />relatively undisturbed and disturbed samples of the subsurface soils were <br />obtained from the borings at the locations indicated on the logs using a <br />Dames a Moore Type U Sampler of the type shown on Plate 4. The sampler <br />was driven with a weight of 360 pounds falling a distance of about 36 <br />inches. The number of blows required to dri•fe the sampler 12 inches into <br />the soil, or other specified distances, is indicated immediately above <br />the sample notations on the logs. <br />Due to the hard and gravelly nature of the subsoils, relatively <br />few undisturbed samples suitably for testing were recovered. Two samples <br />from Boring 2 were tested to determine their moisture and density charac- <br />teristics. The test results are shorm opposite the corresponding sample <br />notations on the log. <br />SUBSURFACE CONDITIONS <br />Our explorations indicate tha'. the entire building site is underlain <br />by dense to very dense glacial till at shallow depths. some portions of <br />the building area contain thin deposits of fill above the till. Glacial <br />till is a very dense mixture of soil particles which range in size from <br />clay to boulders, with the major constituents being sand and silt. <br />Till has been highly consolidated in the past by glacial ice and normally <br />provides excellent foundation support. <br />The mpAimum depth to the top of the till was about 4-1/2 feet at the <br />boring locations. However, the till may be at samewhat greater depths in <br />areas which were not explored. <br />Several buried utilities are present in the northern portion of the <br />building site, including a storm drain and electrical lines. The utilities <br />will have to be rerouted during construction. The depth to undisturbed <br />-3- <br />"^MES 6 moo"IE <br />