2003-10-14_REVISION - M1992069 (3)

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Geotechnical Engineering Report Eagleview Drainage Channel Southwest of "F" Street and 35'h Avenue Terracon Project No. 21035051 Terracon Earthwork General Considerations The following presents recommendations for site preparation, excavation, subgrade preparation and ~ placement of engineered fills on the project. All earthwork on the project should be observed and evaluated by Terracon. The evaluation of earthwork should include observation and testing of engineered fill, subgrade preparation, foundation bearing soils, and other geotechnical conditions exposed during the construction of the project. Site Preparation Strip and remove existing vegetation, debris, and other deleterious materials from proposed building areas. All exposed surtaces should be free of mounds and depressions which could prevent uniform compaction. Stripped materials consisting of vegetation and organic materials should be wasted from the site, or used to revegetate landscaped areas or exposed slopes after completion of grading operations. subgrade soils beneath all exposed areas which will receive fill, once properly cleared where necessary, should be scarified to a minimum depth of 8 inches, conditioned to near optimum moisture content, and compacted. Although evidence of fills or underground facilities such as septic tanks, cesspools, basements, and utilities was not observed during the site reconnaissance, such features could be encountered during construction. If unexpected fills or underground facilities are encountered, such features should be removed and the excavation thoroughly cleaned prior to backfill placement and/or construction. It is anticipated that excavations for the proposed construction can be accomplished with conventional earthmoving equipment. Depending upon depth of excavation and seasonal conditions, groundwater may be encountered in excavations on the site. Pumping from sumps may be utilized to control water within excavations. Based upon the subsurface conditions determined from the geotechnical exploration, subgrade soils 3 feet above groundwater are anticipated to be relatively stable. However, subgrade soils within 3 feet of groundwater are anticipated to be relatively unstable. The stability of the subgrade may be affected by precipitation, repetitive construction traffic or other factors. If unstable conditions develop, 6