2522 RUCKER AVE 2018-01-01 MF Import

fGeoteclu�ical Enginaring Rep�xt ' Gerdener Group Condominiums July 16, 1997 ( NCA File No.209297 Page 6 Iand put the adjacent structures at risk of damage due to settlement. Easements would need to be I obtained if proposed cuts are likely to move across property lines or put the adjacent structures at risk. Some underpinning may also be needed to protect the adjacent sWcmros. If easemenu cannot be obtained or the least amount of risk to edjacent sttuctures is of importence, temporary shoring and/or �� Iunderpinning will be needed. This is discussed further in the Excavatioo Consideratiooa subsection. i 7hc:etback from the street is enough to use slope easements. i ( The on-site soils are moderately to highly moisture sensitive and will be di�cult to compact when wet. I We recommend that precautions be taken during construction to protect the exposed subgrades from i softening due to exposure to water during construction. Earthwork on site can be accomplished with wet I site soils but could be substantially more expensive. The additional expense will include the excavation of additional material,and the import of granular soils for fills and subgrades. ( Erosion Control The site is gently sloping, but finish floor grade is expected to be relatively flat. Surface water could Icollect in low areas and depressions created during preparation and grading. These areas could easily be disturbed by construction traffic,thus increasing erosion potential. To minimize disturbance of prepared subgrades, we recommend that graded arexs be sloped to drain. This is important due to the relatively I- low infiltration rates expected with the exposed on-site soils. Placing rock spalls to form the access may also be needed to reduce the.amount of mud that leaves the site during wet weather. Construction phase I_ erosion conhol could indude, but not necessarily be limited to, the use of hay bales, geotextile bartiers (silt fences), and controlled surface grading. Covering of cut embankmenu and fill storage piles with iplastic sheeting, for temporary crosion control,may also be required during periods of wet weather. I I ISite PreparaHon and Gradiog The site is expected to require excavation down to finish first parking level elevations. The bottom of ( the excavation is expected to be mostly within the very dense ti11. The western portion of the excavation I along the alley may have some fill below finish grade elevation. This material should be removed down to the mcdium dense till, and replaced with structural fill or crushed rock up to desirad finish grade ' n. fter the excavation to ade elevation and the ro r removal of unsuitable soils down to the I elevat�o A gr p pe ( medium dense till,low sreas may be filled with structural fill as outlined in a subsequent section. The till is considered moderately to higF.lv moisture sensitive. The on-site soils will be difficult to i Icompact to engineering standards when weL It may � prudent to overexcavete the site end place a i ( NELSON-COUVRETTE &ASSOGATES, ING