3632 RUCKER AVE THE LANDING AT PORT GARDNER Geotech Report 2023-04-10

11111111111111 Aug. 31. 2004 3:46PM CHARLES MORGAN & ASSOC. No, 0044 P, 4 • Grandview Homes, LW JN 99040 February 16, 1999 Page 2 The compaction of backfill was not in the scope of our services. Loose soil will therefore be found in the area of.the test pits. If this presents a problem, the backfill will need to be removed and replaced with structural fill during construction. Groundwater No groundwater seepage was observed in any of the four test pits. The test pits were left open for only a short time period. Therefore, the seepage levels on the logs represent the location of transient water seepage and may not indicate the static groundwater level. it should be noted that groundwater levels vary seasonally with rainfall and other factors. We anticipate that groundwater could be found in more permeable soil layers, pockets within the till, and between the near-surface weathered soil and the underlying glacial till. CONCLUSIOl4QAND.RECOMMENDATIONS General From a geotechnical engineering standpoint, we do not anticipate any unusual design or construction considerations. The building can be supported on a conventional foundation consisting of individual and spread footings. The soils are silty and thus moisture sensitive. Grading is more difficult when the soils are wet and the soils cannot be used as structural fill or retaining wall backfill if the soil moisture exceeds the optimum moisture for compaction. We recommend that the bearing surfaces be protected with a layer of crushed rock if construction takes place in wet weather. Conventional Foundations The proposed structure can be supported on conventional continuous and spread footings bearing on undisturbed, glacial till, or on structural fill placed above this competent, native soil. See the later sub-section entitled General Earthwork and Structural Fill for recommendations regarding the placement and compaction of structural fill beneath structures. We recommend that continuous and individual spread footings have minimum widths of 16 and 24 inches, respectively. They should be bottomed at least 18 inches below the lowest adjacent finish ground surface. The local building codes should be reviewed to determine if different footing widths or embedment depths are required. Footing subgrades must be cleaned of loose or disturbed soil prior to pouring concrete. Depending upon site and equipment constraints, this may require removing the disturbed soil by hand. The following allowable bearing pressures are appropriate for footings constructed according to the above recommendations: GEOTECH CONSULTANTS.INC.