2118 49TH ST SE 2016-01-01 MF Import

CASCArJE TESTING LABORATORI'� INC, Mr. John Piazza March 4 , 1976 Page 2 The southerly slope to an existiny creek has been fil'.ed with the excavated site material. The subgrade and foundation soils consists of brown interbedded medium dense ;and, silt and clay. One aiea, in the Southeast corner of the building area, has been backfilled with sand. This filled area was presumeably the area where foundations of an old residence existed and wa� subsequently removed. RECOMMENDATIONS — r The in-situ allowable soil pressur.e of the brown foundation soils is estimated maximum 2, 000 p.s. f. The maximum allowable soil pres- sure in the sand filled area is unknown, but is expected to be considerably lower than the brown foundation soils. We �uqgest that before the concrete footings are placed, the foot- ings be over excavated, then backfilled with a select fill to re- 3uce differential settlement. We suggest excavations be 18 inches below the present elevation of the bottom of the footing and ex- tend one foot on either side oE the centerline. This includes the filled area and any interior footings. Backfilling shoul3 be performed utilizing clean granular material, with little fines. Compactior, should be performed in maximum 9 inch lifts to minimum 95� of dry density conforreing to ASTM Standard Designation D-1557 , Method ' D' . Compaction of the excavated "filled area" trench