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TSCHIDA OWASSO HILLS PLAT 4 All fill material in building areas or roadways shall be compacted to 100% of Standard Proctor density in the upper three (3) feet and 95% of Standard Proctor density below the upper three (3) feet. Vertical lifts shall not exceed eight (8) inches loose thickness. The Owner, at his expense, shall employ a recognized soils laboratory to run compaction tests as required to detennine compliance with these requirements. Failure to meet the compaction requirement shall mean removal of the material involved and replacement until this requirement is met, at no additional expense to the Owner. Cost of compaction retests shall be paid for by the Contractor. All other embankments placed shall be subject to ordinary compaction requirements. Ordinary Compaction Requirement is hereby dermed as one foot loose lifts at nearly optimum moisture content compacted until no further yielding is evident. If so desired by the Engineer, density tests shall be taken to verify the field observations. Provided such tests are taken, 90% of Std. Proctor density shall be considered the minimum acceptable density. Any slope steeper than 4: 1 shall be notched prior to placing any fill thereon. Material other than select shall be used for embankment only where designated by the Engineer. This material shall be placed in the embankment by methods similar to the Ordinary Compaction Method, as are feasible. The limits of this excavation will be 1/2:1 slopes providing sufficient width at the bottom of the excavation to allow a 1: 1 side slope of the pad embankment (street or building) and length and depth as approved by the Soils Engineer of his authorized representative and to the bottom of all organic materials. The excavation will be left open to allow the Soils Engineer to inspect the foundation materials, take necessary tests and measure cross-sections for payment. The edges of all backs lopes and fill slopes shall be shaped to blend into the natural ground and shall be covered with a minimum of six (6) inches of topsoil. All streets shall be graded to within 0.2 feet of the grade required under this Contract. The 0.2 foot tolerance shall not be consistently high or low leaving the project with an unbalanced excess or shortage of material for final street construction by others. The method of measurement for common excavation shall be plan quantity. 4. SUBGRADE EXCA V A TION This work consists of excavation below finished grade or 12 inches below natural ground whichever is lower to remove unstable or organic material prior to placing embankments for streets or building areas. This item does not apply to the nonnal sub cut to allow topsoil placement as provided under "Common Excavation". The basis of measurement and payment for Subgrade Excavation shall be Measured Quantity. Topsoil stripping up to 12 inches in fill areas is incidental and is to be included in the unit price for common excavation plan quantity, therefore 12 inches will be deducted from measured depth in detennining payment quantity for subgrade excavation. 5. SELECT BORROW EXCA V A TION Select Borrow Excavation, if detennined by the Engineer as required, shall be material needed to complete select embankments, when the available common excavation material has been fully utilized. -2-