1920 75TH ST SE 2016-01-01 MF Import

Conifer Apartuents September d, 197f Page Five COPICLUSIO��S AIJD REC061I4ENDATIONS G[NERAL Our ob��rvations and findings have been discussed with you and it was concluded that cast-in-place concrete "auger cast" piles should bc used to obtain support in the dense sand below the peat. Trenches would be excavated under the buildSng 3t intervals and concrete beams bearing on thc piles installed to support the building in the affected areas. No attempt would be made to relevel the building since it can not be determined that the buildin9s were level to begin with, and because tlie buildings are in reasonably 9ood condition at their present elevations. A number of alternatives including acceptance of the risk of future settlements and of damage, construction of a system for re- leveling the buildin9 periodically, and underpinnin9 using a combination of neai pilin9 and hand du9 underpinning were discussed with your rep- resentatives and rejected. Some consideration o-ias given to digging doo-m through the exis�ing fill, and replacing the sections of the piles above the water level �•iith ccncrete, however, we do not helieve that it is safe to rely on the suppor; of the existing piles. fOUPJDATIOt� SUPf'(1RT We recomniend that new foundation support be provided for the 6uildings south of the line indicated on Lhe Plot Plan. The foundation should cbtain its support from the dense sand or sand with gravel uoderlying the fill and peat soils. ble recrnnniend that auyer cast piles, a minimum of 12 inches in diameier, be used. The piles should extend a minimum of 20 feet belo�a the existing surface or deeper as necessary to penetrate a,minimum of q fect into the dense sand or sand riith aravel. 4Jc expect that thr longe�t piles required ��ill be ahout 30 feet near borin9 One. �