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12th Street and 27th Avenue Improvements Page 2 Project No . PSL-09-3054 ( 10 . 7) April 12, 2013 Field Observation & Testing • Earthwork observations by an engineering technician during the site grading operation including the proof-rolling of "strip grade" for the roadway widening alignment and embankment construction as requested by Indian River County. • In-place density testing will be performed during placement of the embankment fill for roadway widening. The density tests will be performed at a frequency of approximately one ( 1 ) test for every 200 lineal feet of roadway/embankment within the proposed alignment, for each 1400t thickness of backfill placed. • In-place density testing during backfilling of storm drains and catch basins for each 1 -foot lift of backfill placed from the bottom of the structure up to an elevation corresponding to final grade. • In-place density testing during backfilling of the rigid and flexible pipelines. Below pavement areas, density tests will .be performed at a frequency of approximately one test location for each 2001f (or fraction thereof) of pipe . At each roadway or driveway crossing, density tests will be performed for each 6-inch lift of backfill placed starting at an elevation corresponding to the invert of the pipe and extending up to the final grade. • In-place density tests within the stabilized subgrade and base course layers at a frequency of approximately one ( 1 ) test for each 2001f of roadway. At roadway crossings for the pavement restoration, 24-inches of base rock will be placed and tested in four (4) &inch lifts . • In-place density tests for the sidewalk and driveway subgrade prior to concrete placement. • Sampling, slump testing , molding, transporting, curing, and laboratory testing to determine the compressive strength of concrete used for the sidewalk, driveways and curbing. Laboratorp Testin • Perform laboratory moisture-density relationship (Proctor) tests (AASHTO T- 180 and AASHTO T-99) and sieve analysis (percent fines for soil classification purposes) tests on the embankment fill and/or pipe backfill soils . • Limerock Bearing Ratio (LBR) tests for stabilized subgrade and base course within the roadways . • Concrete cylinder test specimens will be tested following ASTM C39 for their compressive strength at 7 days and 28 days after placement. Engineering & Reporting • Engineering oversight during the construction to coordinate the aforementioned test program, make site visits, attend progress meetings, and provide professional engineering consultation, as needed. • Submittal of brief engineering reports documenting our findings and test results. DUNKELBERGER