Subsurface Exploration and Testing. 1.1 Perform a geotechnical engineering investigation at the site of the project.
1.1.1 Conduct subsurface explorations and provide information needed for the design of a cost effective pavement structural section for the proposed roadway improvements. • Contact utility one call services to mark all existing utilities in the project corridor prior to starting work activities.
1.1.2 Implement traffic control as required to accomplish the exploratory drilling. Prepare and submit to the County for review and approval, necessary traffic control plans and permit forms.
1.1.3 Advance one exploratory boring at maximum intervals of 500 lineal feet of roadway alignment to a minimum depth of 15 feet. At ponding area sites, perform a minimum of two exploratory borings at each site, extending to a minimum depth of 20 feet below the anticipated depth of pond.
1.1.4 Perform split spoon standard penetration tests (SPT) at 2.5 feet below grade and 5 feet thereafter.
1.1.5 Develop a laboratory soils testing program to perform moisture content (ASTM D 2216), dry unit weight (ASTM D 2937), percent passing the No. 200 sieve (ASTM D 1140), Atterburg limits determination (ASTM D 4318) and sieve analysis (ASTM D 6913) for each major soil type encountered. Utilize the index test to classify the recovered soils in accordance with the Unified Soils Classification System.
1.1.6 Derive soil strength utilizing the split spoon SPT blow counts or unconfined compressive strength tests (ASTM D 2166) on selected soils.
1.1.7 Perform a California Bearing Test (CBR) (ASTM D 1883) for each major soils type.
1.1.8 Perform a minimum of two percolation tests at each ponding area site at the anticipated depth of pond.
Subsurface Exploration and Testing. 1.1 Perform a geotechnical engineering investigation at the site of the project.
1.1.1 Conduct subsurface explorations and provide information needed for site preparation and illumination and signal foundations for the proposed roadway improvements. Contact utility one call services to mark all existing utilities in the project corridor prior to starting work activities.
1.1.2 Implement traffic control as required to accomplish the exploratory drilling. Prepare and submit to the County for review and approval, necessary traffic control plans and permit forms.
1.1.3 Perform split spoon standard penetration tests (SPT) at 2.5 feet below grade and 5 feet thereafter.
1.1.5 Develop a laboratory soils testing program to perform moisture content (ASTM D 2216), dry unit weight (ASTM D 2937), percent passing the No. 200 sieve (ASTM D 1140), Atterburg limits determination (ASTM D 4318) and sieve analysis (ASTM D 6913) for each major soil type encountered. Utilize the index test to classify the recovered soils in accordance with the Unified Soils Classification System.
