4945 OCEAN AVE 2018-01-02 MF Import

GEOTECHNICAL ENGINEERING STUDY Mr. Rick Remsing E-10558 May 5, 2003 Page 11 Utility Support and Backfill Based on the soil conditions encountered, the soils expected to be exposed by utility excavations should provide adequate support for utilities. Utility trench backfill is a primary concern in reducing the potential fer settlement along utility alignments, particularly in pavement areas. It is important that each section of utilitV line be adequately supported in the bedding material. The material should be hand tamped to ensure support is provided around the pipe haunches. Fill should be carefully placed and hand tamped to about twelve (12) inches above the crown of the pipe before heavy compaction equipment is brought into use. The remainder of the trench backfill should be placed in lifts having a loose thickness of less than twelve (12) inches. A typical trench backfill section a, J compaction requirements for load supporting and non - load supporting areas is presented on Plate 5. Driveway Grading The access driveway into the site will need to be regraded as part of the project. The driveway surface should be prepared and structural fill placed as recommended in the Site Preparation and General Earthwork section of this report. Based on the existing site grades, retaining walls or rockeries will be necessary to achieve design grades. Recommendations for rockeries are provided below. ECI can provide additional recommendations for walls once grades have been finalized. The primary function of a rockery is to cover and protect an excavated or reinforced fill surface that would essentially stand near vertical or vertical. Rockery construction is largely a craft not entirely controllable by engineering methods. As such, it is imperative the proposed rockeries be constructed in close conformance with the Association of Rockery Contractors (ARC) Standard Rockery Construction Guidelines and by and experienced contractor with a proven capability in rockery construction. The rockeries should be embedded twelve (12) inches into native soil. Fill soils or loose native soils should be removed and replaced with structural fill or the base rock placed on the overexcavated surface. Cut rockeries up to eight feet in height may be constructed in accordance with Plate 6. A representative of ECI should observe the rockery subgrade and cut face prior to placing the base rock and drainage. Earth Consultants, Inc.