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Be In no case shall the Contractor proceed to construct the base course on the <br /> subgrade until the subgrade has been tested for Limerock Bearing Ratios and <br /> compaction, line and grade is checked, and approval given by the Engineer. <br /> 5 . STABILIZED SHOULDERS <br /> A . Stabilized shoulders shall be constructed on each side of the paved roadway <br /> section to the width, depth and slope as shown on the Plans and Typical <br /> Sections . The stabilized shoulder material shall have a minimum Limerock <br /> Bearing Ratio of 40 as determined by the Limerock Bearing Ratio Test. In an <br /> area where the bearing ratio is less than 40, stabilizing material approved by <br /> the Engineer shall be furnished by the Contractor, spread, and mixed thoroughly <br /> throughout the entire depth and width of the stabilizing limits .. No specific <br /> density will be required and compaction shall be only to the extent directed by the <br /> Engineer. <br /> 6 . COMPACTION TESTING <br /> A . In general , Limerock Bearing Ratio tests on the subgrade shall be taken at <br /> approximately 500 lineal foot intervals . Exact locations will be designated by <br /> the Engineer. <br /> Be The maximum dry density of the subgrade material shall be determined by the <br /> Modified Proctor Test using the procedure as described by ASTM D1557 or <br /> AASHTO-T180 (Method A) . In general , there shall be one Modified Proctor Test <br /> per 500 lineal feet at a location which is representative of the type of <br /> subgrade material used on the project. Each material which is inherently <br /> different in composition from other subgrade material and which is used over a <br /> widespread area of the project, will necessitate an additional Modified <br /> Proctor Test, <br /> C . In general , in-place density tests shall be performed at approximately 500 feet <br /> intervals for each lift. Additional density tests may be required by the engineer. <br /> If any tests results are unsatisfactory, the contractor shall re-excavate and re ,, <br /> compact the backfill at his expense until the required compaction is achieved . <br /> C : \ D0wn1oad \ techspec - 02301 . doc <br /> 02301 - 2 <br />