MEMORANDUM

 Date:  6 June 2006

 Project:  Hibler Residence Addition & Remodel

 From:  Paul Klein

 To:  Mike Sullivan / Precision Construction

 cc:  Gary & Janie Hibler

   Pat Kelly, P.E.

   Peder Golberg, P.E. / J.G. Pierson

 Re:  Foundation Excavation

Pat Kelly (Geotechnical Engineer) and Peder Golberg (Structural Engineer) met at the project site to observe the excavation conditions and to discuss the options for resolution of the unanticipated depth of non-native fill material at the lowest elevations of the new footings. After the meeting, Peder met with Paul Klein at the office of the Architect to describe a proposed solution for the removal of the additional fill.

The Structural Engineer recommends the following:

1.  Install (2) helical foundation anchors at the line of the existing house foundation at the locations where the new Stair foundation intersect with the existing foundation wall. Due to the depth of the existing foundation at the northwest corner of the house, one of the helical anchors will be fastened to the face of the existing concrete foundation wall. Additional over-excavation of undesirable fill material can proceed once the existing foundation has been supported.

2.  A grade beam will be constructed to span between the anchors at the east side of the Stair. This grade beam will allow the existing tree on the downhill side of the new Stair to remain.

3.  (3) additional helical anchors will be placed under the Stair foundation in alignment with 4”x4” steel posts at the Landing and under the north end of the Masonry wall on the east side of the Stair. (See enlarged Stair Plans on Sheet 10.)

4.  Over-excavation of fill material at the location of the new foundation wall on the east side of the new Basement Office will also be required. Depending on the depth of the excavation to undisturbed native soil, the footing may be extended down to reach the new grade or the new footing may be placed on engineered compacted fill. The design of the concrete foundation wall may need to be revisited by the Structural Engineer if the height of the wall is taller than as shown on the current approved drawings.

5.  Compacted fill will be eliminated from under concrete slabs at the lowest level of the Stair and under the areas of slab flanking the stairway from the new Patio up to the level of the Basement. Concrete floor and stair slabs will be designed to span over the new crawlspaces below. (See Sub-Basement Plan Sheet 10, Sections A/6, A/10, B/10 & J/11, and Details B/2, C/10 & D/10.)

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