204 E MAGNOLIA AVE 2016-01-01 MF Import

Allestad June 18, 1990 Site Grading Site grading is expected to include excavation for the proposed basement level and backfill of the basement walls. The contractor should be aware that excavation of the very dense glacial soils will be difficult and n,ay require special equipment. All construction should be performed in a manner which minimizes disturbance to the existing slopes. should be removed from the construction area. Excess material from construction excavations may be placed in non- structural areas in the lower flat lying portions of. the property south of the site or it could be used to flatten and buttres the existing east s1oFe provided that the materials are cleaned of organics and are properly placed and compacted. Temporary Excavations: Based on the ssbsurface conditions encountered in our test pits, it is our opinion that sloped temporary excavations in the natural soils may be made vertically to depths less than 4 feet. Deeper temporaray excavations and all exca��ations in the existing fill should be made at slope yradients no steeper than 1:1 (horizontal:vertical) . Where there is not enough room for sloped excavations, shoring should be used. It should be noted that the contractor is responsible for safety and maintenance of construction slopes. We noted that a city sewPr line crosses the northwest corner of the site and should be protected during site development. Sandy soils exposed in cut slopes should be kept moist, but not saturated, to retard ravelling and sloughing. Surface drainage should be directed away from the top e�ge of the cut slope. Surcharge loads should not be allowed within 5 feet of the top of the slope or within a 1�1 (horizontal : vertical) plane extending up from the tae of excavation, whichever is greater. Structural Fill: Exr.avated onsit•e soi.ls are considered suitable for general structural Pill provided that they are cleaned of organics and the moisture content can be adequately controlled however, onsite soils are not considered suitable for backfill against basement retaining walls because they may not be adequately free-draining. Basement backfill will require clean imported sand/gravel soils. In our experience, except in dry, low humidity weather, proper fill placement and compaction may require the use of imported granular fill material for structural fill. Rzcommended specifications for placement and compaction of structural fill are presented in Appendix B. Page No. 7 Project No. 90-122-01 1