7501 EVERGREEN WAY 2016-01-01 MF Import

DWR CONSULTANTS, Inc., Geotechnical lnvestigafion Propased Saleway Gasoline S(afion, June 8, 2000 The engineering co�nmunity has used compaction as a gauge for soil strength. While this is often an acceptable approach, the 95% o( maximum dry density "flxation" is sometimes counterproductive. Soils can be over-compacted and lose strength in the process of doing so. New technology developed for the military and put into practice by a grant from the Federal Highway Administration, uses vibrations with small deflection measurements to directly measure the strength or "stitiness" of a soil. It was develope:i about 2- �/2 yrs. ago and has been ex'�nsively tested and used by the transportaiion departments in Texas, Minnesota, North Carolina, and New York. It also has the capacity to measure soil strength of coarse gravel fill as well. It has received testing at the University of Massachusetts, Amherst, and the New tilexico Technology Instiiute. We have given the actual soil strength parameters for meeting the design requirements using a Geogage (soil stiffness gage). 6.7 Lateral Eanh Pressure Use an equivalent fluid pressure af 37.3 pcf lor active lateral pressure and 52 pcf for "at rest" lateral pressure. 6.8 General Two additional elemenls of geotechnical engineering service provide impoKant support to the successful completion of this project: i. Consultation with design professionals during the deslgn phase. This ensures incorporation of the intent of our recommendations into design decisions related to the project and that any changes in ihe design concept properly consider the geotechnical parameters. This is part of our Scope-of-Work and lhere is no additional charge for this service. 2. Observation and monftoring during construction. An engineer or engineering technician should be retained to observe ihe earthwork phases oi this project, including site grading and foundation excavations to determine that subsurface conditions are compatible with those used in our analysis and design. This is part of our Scope-of-Work and there is no adcJitional charge for this service During site grading, placement of fill should be observed and tested to confirm that proper compaction has been achieved. This is a separate function (rom our Scope-of-Work and will be a separate charge. 7.0 LIMITATIONS This geotechnical investigation contains limitations. These limitations are discussed in the following attachment Important Information about your Page 10 of 11