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more than 0.2 inch from the plan thickness, full payment will be made. If the average thickness of the three cores is deficient more than 0.2 inch but not more than 1.0 inch from the plan thickness, an adjusted unit price as provided in subsection 501.25(b) will be paid for the area represented by these cores.

In calculating the average thickness of the pavement, measurements which are in excess of the specified thickness by more than 0.2 inch will be considered as the specified thickness plus 0.2 inch, and measurements which are less than the specified thickness by more than 1.0 inch will not be included in the average.

When the measurement of any core is less than the specified thickness by more than 1.0 inch, the actual thickness of the pavement in this area will be determined by taking additional exploratory cores at not less than 10-foot intervals parallel to the center line in each direction from the affected location until in each direction a core is found which is not deficient by more than 1.0 inch. Areas found deficient in thickness by more than 1.0 inch shall be evaluated by the Engineer, and if in his determination the deficient areas warrant removal, they shall be removed and replaced with concrete of the thickness shown on the plans. Exploratory cores for deficient thickness will not be used in averages for adjusted unit price.

Method of Measurement 501.24 The quantity to be paid for under this item will be the number of square yards of concrete pavement completed and accepted as measured complete in place. The width for measurement will be the width of the pavement shown on the typical cross section of the plans, additional widening where called for, or as otherwise directed in writing by the Engineer. The length will be measured horizontally along the center line of each roadway or ramp.

Measurement of reinforcing steel placed in the slab as a lower layer at locations shown on the plans or directed by the Engineer will be made in accordance with subsection 602.07. All other steel required for the work of this section will not be measured for separate payment.

Basis of Payment 501.25 (a) General.—The accepted quantities of concrete pavement determined as provided above will be paid for at the contract unit price per square yard which price and payment will be full compensation for furnishing and plac

ing all materials, including any dowels and joint material, provided, however, that for any pavement found deficient in thickness by more than 0.2 inch, but not more than 1.0 inch, only the reduced price stipulated below will be paid.

No additional payment over the unit contract bid price will be made for any pavement which has an average thickness in excess of that shown on the plans.

Reinforcing steel, measured as provided in subsection 501.24, will be paid for under section 602. When high-earlystrength cement is used at the direction of the Engineer, an additional payment per square yard will be made, in addition to the above, for the area of pavement in which such cement was used as ordered, in accordance with the bid price for pay item 501(3).

Payment will be made under:

Pay item

Pay unit
501(1) Reinforced portland cement con-
crete pavement

Square yard.
501(2) Plain portland cement concrete
pavement

Square yard. 501(3) High early strength pavement (added payment)

Square yard. (b) Price adjustments.Where the average thickness of pavement is deficient in thickness by more than 0.2 inch, but not more than 1.0 inch, payment will be made at an adjusted price as specified in the following table.

Concrete Pavement Deficiency Deficiency in Thickness

Proportional Part Determined by Cores

of Contract Price Inches

Allowed 0.00 to 0.20

100 percent 0.21 to 0.30

80 percent 0.31 to 0.40

72 percent 0.41 to 0.50

68 percent 0.51 to 0.75

57 percent 0.76 to 1.00

50 percent

When the thickness of pavement is deficient by more than one inch and the determination of the Engineer is that the area of such deficiency should not be removed and replaced, there will be no payment for the area retained.

(c) Adjusted proportions.-Adjustments in proportions made in accordance with the provisions of subsection 501.03 (b) which result in a change of more than 2 percent

in the designated nominal cement content of mixes designed for minimum strength will be adjusted for or against the Contractor by the cost to him of cement at his point of cement storage for the project, for the quantities in excess of a 2-percent variation.

Sections 502 through 599.RESERVED

Section 600

INCIDENTAL CONSTRUCTION

Section 600A.-PILING

Description 600A.01 Scope. This work shall consist of piling furnished and/or driven or placed in accordance with these specifications and in reasonably close conformity with the plans.

The Contractor shall furnish the piles in accordance with an itemized list, which will be furnished by the Engineer, showing the number and lengths of all piles. When test piles and load tests are required in conformance with subsections 600A.02 and 600A.03, respectively, the data obtained from driving test piles and making test loads will be used in conjunction with other available subsoil information to determine the number and lengths of piles to be furnished. The Engineer will not prepare the itemized list of piles for any portion of the foundation area until all loading tests representative of that portion have been completed.

In determining lengths of piles for ordering and for footage to be included for payment, the lengths given in the order list will be based on the lengths which are assumed to remain in the completed structure. The Contractor, shall, without added compensation, increase the lengths to provide for fresh heading and for such additional length as may be necessary to suit the Contractor's method of operation.

600A.02 Test Piles. For his own information, the Contractor may drive such test piles as he may consider necessary. When called for in the bid schedule or when needed for calibrating hammers as provided in subsection 600A.03, the Contractor shall furnish and drive test piles of the dimensions and at the locations designated by the Engineer. They shall be of the material shown in the bid schedule and shall be driven to refusal or to such tip elevation or approximate bearing value as the Engineer may request. Whenever such piles are to be incorporated in the completed structure, they shall be driven with the same type of equipment that is used for driving foundation piles.

When the Engineer requests a load test to determine a bearing value, the first load test pile shall be driven to the

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