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� � � • 7L��[�ILI <br />4. SUBSURFACE CONDITIONS <br />]n general, the soils encountered in our tests plts consisted of the <br />following: <br />UN[T 1 Loose to compact, light to dark brown, silty f-m SAND, little f-c <br />gravel tu f-m SANO, some silt, little f-c gravel (Fill). <br />UNIT 7. Very soft to soft, dark brown to black, silty PEAT (Peat). <br />UNIT 3 Soft to firm, light blue-grey to light reddish-brown, LLAYEY SILT to <br />SILTY CLAY, trace organics (Clayey Silt). <br />UNIT 4 Dense to very dense, light grey-brown, f-m SAND and GRAVEL, some <br />silt (Glacial Till). <br />In general, not all units were encountered at each test pit location. Test <br />pits TP-1 and TP-4 were excavated, on the high ground, along the western <br />boundary of the property. These test pits encountered zero to three and one <br />half feet of Fill (Unit 1) overlying Glacial Till (Unit 4). The Glacial Till <br />(Unit 4) extended to the maximum depth explored. <br />The remainder of the test pits were excavated in the central and eastern <br />portions of the site. In general, the subsurface stratigraphy consisted of <br />zero �o seven feet of Fill (Unit 1) overlying one and one half to six feet of <br />Peat (Unit 2). In two of the test pits, TP-5 and TP-8, three to six feet of <br />Clayey Silt (Unit 3) aas encountered below the Peat (Unit 2). The Glacial <br />Till (Unit 4) was encountered at the base of all the test pits and extended to <br />the maximum depths explored. The depth at which the Glacial Till (Unit 4) was <br />encountered in each of the test pits is shown on Figure 2. <br />Groundwater was encountererl in four of the nine test pits (TP-1, 2, 5, and 6) <br />completed as part of this study. Water seepage was observed in both the Peat <br />(Unit 2) and the Glacial Till (Unit 4). The depth and amount of seepage in <br />site excavatlans should be expected to vary with the season, local rainfall, <br />and lake level. The annual high groundwater levels should be expected during <br />the late winter and spring months. <br />5. CONCLUS[ONS AND RECOMMENDATIONS <br />5.1 General <br />Based on the results of our geotechnical engineering study, it is our apinion <br />the site can generally be develoned as planned. The upper soil units (Units <br />1, 2, and 3) are unsuttable for the support of buildings. However, the <br />Glacial Till (Unit 4) which underlies the entire site is suitable to support <br />the proposed structures with shallow conventional isolated or continuous <br />spread footings or pile foundations. <br />Golder Associates <br />