3431 WETMORE AVE 2018-01-02 MF Import

?:-00 MON 11:40 A" Coogan 3431 Wetmore — Basement Wall Failure Page 2 of 3 S. There is a lack of support to the north wan of the residence, although some temporary shoring is in place at the , -est end. 6. Tilt concrete wan varies in thickness between 6 and 8 inches and is unreinforcod . 7. There is no footing at the bare of the basement wall and no anctar boks connecting do top ofw wall tow Boor flaming. 8. There is evidence that the faihre may have originated at a vertical constriction John Clow tow canter ofw wall 9. A horizontal cold joint in the concrete at middaigid is open along the remaining west section of the wan. 10. There is rho str utwal connection between the north side basement wall and the east and west sections of basement wall. 11. 'I'hc backfin behind the wean has Wdkd through the opening. We observed that this spoil and tiro remaining backflal comists of damp brown sand with little or no fines or gravel 12. The soil failure surfloe, 31k to the north of the Soled wan is new vertical and tevesls brown sand material similar to the wall backflil. 13. The basemcni wall section at the west end was found to be oat of plumb by approximately I inch in 711. CONCLUSIONS Based on the foregoing etgineerirtg investigation and our stalysis, to a reasonable degree of engineering and scientific probability. Jarnot Engineering, Inc. bees concluded the followtov 1. Our calwlatlons show that this wan could have filled at any time after its original construction fbom active soil pressure. Faihm of the coneimto in tension due u, bending is the most likely mode of failure. This is wggasted by our calculations for an uomiafbrcod conaete wall, and is borne out by our observation. The presence of imperfections such as cold joisss in the oonereta would tend to waken the wall. 2. The backfiill behind the wan is free -draining clean sand. It is the opinion of Jsmot Engineering, Inc. that water Rnm roof of yard nmoff would quickly seep away seal not accumulate behind the wall. 3. The basement wall failure has resulted in loss of vertical sul"d to the north side of the house, including first and we floors and roof. 4. Support for the east and wee wall, has been reduced as a result of the 1lailore of the north wall. )ARNOT ENGINEERING INC. (3 E -d LWO EW 9S9 toNQMVD 1Wd HOKA H"SZ: k k 005-£L-0L