530 VIEW RIDGE DR 2016-01-01 MF Import

Mr. and Mrs. Qill Leese Page Two Conclusion/Recommendations: Based on the (indings of this assessment and cxperien_�r with similar sloping properties in the area, the following is recommended: • Do nol use standard shallow footings for the new addition. ` • Utilize needle oiles for new addilion support. Needle piles are 2-inch diameter steel pipe (ASTM 80) driven to refusal depths (less than 1 inch penetration per minute of (ull driving force - 90 Ibs. hammer minimuml. . Needle piles are driven in battered pairs or "triples", and typically provide 8 kips/pair capacity. • The top of needle piles am cut off ro desired yrade, reinforcing steel placed in either a pile cap configuration, or as part o( a continuous rein(orced grade beam. • A(ter review of the ArchilecCs addition plans, a series of 4 pile-pair are designed (or th�. �vest end of the addition. n grade-beam footing will be constructed atop the piles. Repairs: lhe locations ot the setUements/shifting cen be stabilized through the technique of needle piles placed adjacent the existing foundation footing. Thc piles are "tied-in° to the existing concrete by means o( dril(ed re-bar and abutting pile cap (see sketch). It desired, settlements may be partially or fully reclaimed via cribbing, jacking, and tightenin� the existing foundation to the ne�,v pile caps. This engineer recommends stabilizina. versus lifting Ihe house, at this time. A preliminary estimate of requimd needle pile-pairs to stabilize the weslern foundalion is 20. Dependinq on depth to refusal, fewer piles m.�y be requimd. Conclusi on: The original conshuction o( the msidence dicl not (ully compensate (or the sloping lot geometry, as weil as subsequent erosional undennining from seepage erosion. SettlemenUshifting has occurred. Deeper bearing foundation system is required for the new addition and to stabilize the �xisting foundation.