am_2.pdf

AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT

Except as provided herein, all terms and conditions of the document referenced in Item 9A or 10A, as heretofore changed, remains unchanged and in full force and effect.

15A. NAME AND TITLE OF SIGNER (Type or print)

30-105-04EXCEPTION TO SF 30

APPROVED BY OIRM 11-84

STANDARD FORM 30 (Rev. 10-83) Prescribed by GSA

FAR (48 CFR) 53 243

The Solicitation for Indefinite Delivery Indefinite Quantity for Pavement Structure, Drainage, Utility Lines and Site Work, Depot Wide, Red River Army Depot, Texarkana, Texas , is amended as follows:

See Continuation Sheet.

NOTE: Proposal Receipt date and time remain 16 June 2009, 2:00 p.m. local time, as previously announced.

1. CONTRACT ID CODE PAGE OF PAGES

J 1 2

16A. NAME AND TITLE OF CONTRACTING OFFICER (Type or print)

16C. DATE SIGNED

BY

16B. UNITED STATES OF AMERICA15C. DATE SIGNED15B. CONTRACTOR/OFFEROR

(Signature of Contracting Officer)(Signature of person authorized to sign)

8. NAME AND ADDRESS OF CONTRACTOR (No., Street, County, State and Zip Code) X 9A. AMENDMENT OF SOLICITATION NO.

W9126G-09-R-0066

X 9B. DATED (SEE ITEM 11)

15 May 2009

10B. DATED (SEE ITEM 13)

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

X The above numbered solicitation is amended as set forth in Item 14. The hour and date specified for receipt of Offer is extended, X is not extended.

Offer must acknowledge receipt of this amendment prior to the hour and date specified in the solicitation or as amended by one of the following methods:

(a) By completing Items 8 and 15, and returning copies of the amendment; (b) By acknowledging receipt of this amendment on each copy of the offer submitted;

or (c) By separate letter or telegram which includes a reference to the solicitation and amendment numbers. FAILURE OF YOUR ACKNOWLEDGMENT TO BE RECEIVED AT THE PLACE DESIGNATED FOR THE RECEIPT OF OFFERS PRIOR TO THE HOUR AND DATE SPECIFIED MAY RESULT IN REJECTION OF YOUR OFFER. If by virtue of this amendment you desire to change an offer already submitted, such change may be made by telegram or letter, provided each telegram or letter makes reference to the solicitation and this amendment, and is received prior to the opening hour and date specified.

12. ACCOUNTING AND APPROPRIATION DATA (If required)

13. THIS ITEM APPLIES ONLY TO MODIFICATIONS OF CONTRACTS/ORDERS.

IT MODIFIES THE CONTRACT/ORDER NO. AS DESCRIBED IN ITEM 14.

A. THIS CHANGE ORDER IS ISSUED PURSUANT TO: (Specify authority) THE CHANGES SET FORTH IN ITEM 14 ARE MADE IN THE

CONTRACT ORDER NO. IN ITEM 10A.

B. THE ABOVE NUMBERED CONTRACT/ORDER IS MODIFIED TO REFLECT THE ADMINISTRATIVE CHANGES (such as changes in paying office, appropriation date, etc.) SET FORTH IN ITEM 14, PURSUANT TO THE AUTHORITY OF FAR 43.103(B).

C. THIS SUPPLEMENTAL AGREEMENT IS ENTERED INTO PURSUANT TO AUTHORITY OF:

D. OTHER (Specify type of modification and authority)

E. IMPORTANT: Contractor is not, is required to sign this document and return copies to the issuing office.

14. DESCRIPTION OF AMENDMENT/MODIFICATION (Organized by UCF section headings, including solicitation/contract subject matter

10A. MOD. OF CONTRACT/ORDER NO.

2. AMENDMENT/MODIFICATION NO. 5. PROJECT NO.(If applicable)

6. ISSUED BY

3. EFFECTIVE DATE

27 May 2009

CODE

US ARMY ENGINEER DISTRICT, FORT WORTH

ATTN: CESWF-CT

819 TAYLOR ST, ROOM 2A19

P.O. BOX 17300

FORT WORTH TX 76102-0300

W9126G 7. ADMINISTERED BY (If other than item 6)

4. REQUISITION/PURCHASE REQ. NO.

CODE

See Item 6

FACILITY CODECODE

EMAIL:TEL:

W9126G-09-R-0066

SECTION SF30 - CONTINUATION PAGE

SUMMARY OF CHANGES

CHANGES TO SPECIFICATIONS

1. New Section.- Add the attached new section 32 11 20 - CRUSHED AGGREGATE BASE COURSE, bearing the notation "ACCOMPANYING AMENDMENT NO. 0002 TO SOLICITATION NO. W9126G-09-R- 0066, and add to the Project Table of Contents."

2. Replacement Section.- Add the attached replacement section 32 11 24 – TXDOT TYPE C IRON ORE BASE COURSE**, bearing the notation "ACCOMPANYING AMENDMENT NO. 0002 TO SOLICITATION NO.

W9126G-09-R-0066, and change the section title in the Project Table of Contents.”

**Please note: the only change to section 32 11 24 was the section title.

End of Summary of Changes

ACCOMPANYING AMENDMENT NO. 0002 TO SOLICITATION NO. W9126G-09-R-0066

32 11 20 -1

SECTION 32 11 20

CRUSHED AGGREGATE BASE COURSE

(Am #2)

PART 1 - GENERAL

1. APPLICABLE PUBLICATIONS: The publications listed below form a part of this specification to the extent referenced. The publications are referred to in the text by basic designation only.

American Society for Testing and Materials (ASTM) Publications:

C 29-97 (2003) Unit Weight and Voids in Aggregate.

C 88-99a Soundness of Aggregates by Use of Sodium Sulfate or Magnesium Sulfate.

C 117-03 Materials Finer Than 75-um (No. 200) Sieve in Mineral Aggregates by Washing.

C 131-03 Resistance to Degradation of Small-Size Coarse Aggregate by Abrasion and Impact in the Los Angeles Machine.

C 136-01 Sieve Analysis of Fine and Coarse Aggregates.

D 75-03 Sampling Aggregates.

D 1556-00 Density of Soil in Place by the Sand-Cone Method.

D 2922-01 Density of Soil and Soil-Aggregate In Place by Nuclear Methods (Shallow Depth).

D 3017-01 Moisture Content of Soil and Soil-Aggregate in Place by Nuclear Methods (Shallow Depth).

E 11-01 Wire-Cloth Sieves for Testing Purposes.

Texas Department of Transportation (TxDOT) Publication:

1995 Standard Specifications for Construction of Highways, Streets and Bridges.

Arkansas State Highway and Transportation Department (AHTD) Publication:

2003 Standard Specifications for Highway Construction.

2. EQUIPMENT: All plant, equipment, and tools used in the performance of the work will be subject to approval before the work is started and shall be maintained in satisfactory working condition at all times. The equipment shall be adequate and shall have the capability of producing the required compaction, meeting grade controls, thickness control, and smoothness requirements as set forth herein.

32 11 20 -2

3. SAMPLING AND TESTING:

3.1 Source Sampling and Testing: Sampling and testing at the source shall be the responsibility of the Contractor. Sampling and testing shall be performed by an approved commercial testing laboratory, except for dry sieve analysis samples, which may be taken by the Contractor from the conveyor belt discharge. Copies of test results shall be furnished to the Contracting Officer.

3.2 Job Site Sampling and Testing: All sampling and testing at the job site shall be the responsibility of the Contractor and shall be performed at no cost to the Government. When test results indicate that compaction is not as specified, the material shall be removed, replaced and re-compacted to meet specification requirements, at no additional cost to the Government. Tests on re-compacted areas shall be performed as directed by the Government at the Contractor's expense.

3.3 Minimum Number of Tests at The Source: During production the Contractor shall ensure that the minimum amount of testing specified below is performed initially and at testing intervals shown.

Any material which is placed and accepted without the required testing at the source will be paid for at 90% of the contract unit price. Minimum testing requirements at the source are:

Required Test Testing Interval Sieve Analysis - dry 500 CY Sieve Analysis - washed 4000 CY Liquid Limit and Plasticity Index 4000 CY Wear Test 2000 CY

3.4 Samples: Samples for material gradation, liquid limit, and plastic limit tests shall be taken in conformance with ASTM D 75.

3.5 Tests:

3.5.1 Sieve Analyses: Sieve analyses shall be made in conformance with ASTM C 117 and C 136.

Sieves shall conform to ASTM E 11.

3.5.2 Liquid Limit and Plasticity Index: Liquid limit and plasticity index shall be performed by an approved commercial testing laboratory.

3.5.3 Density Tests: Density shall be measured in the field in accordance with ASTM D 1556 or ASTM D 2922. The frequency of testing shall be one set for every 1000 square yards of completed area. For the method presented in ASTM D 1556 the base plate as shown in the drawing shall be used. For the method presented in ASTM D 2922 the calibration curves shall be checked and adjusted if necessary using only the sand cone method as described in paragraph "Calibration" of the ASTM publication. Tests performed in accordance with ASTM D 2922 results in a wet unit weight of soil and when using this method, ASTM D 3017 shall be used to determine the moisture content of the soil. The calibration curves furnished with the moisture gages shall also be checked along with density calibration checks as described in ASTM D 3017. The calibration checks of both the density and moisture gages shall be made by the prepared containers of material method, as described in paragraph "Calibration" of ASTM D 2922, on each different type of material being tested at the beginning of a job and at intervals as directed.

3.5.4 Soundness Test: Soundness tests shall be made in conformance with ASTM C 88.

3.5.5 Wear Test: Wear tests shall be made in conformance with ASTM C 131.

3.6 Approval of Material: The source of the material to be used for producing aggregates shall be selected 30 days prior to the time the material will be required in the work. Tentative approval of material will be based on tests of samples for the specific job. Final approval of both the source and the material will be based on tests for gradation, liquid limit, and plasticity index performed on samples taken from the completed and compacted subbase course.

32 11 20 -3

4. WEATHER LIMITATION: Base courses shall be placed when the atmospheric temperature is above 35 degrees F. Areas of completed base course that are damaged by freezing, rainfall, or other weather conditions shall be corrected to meet specified requirement.

5. WAYBILLS AND DELIVERY TICKETS: Copies of delivery tickets shall be submitted during the progress of the work. Before the final statement is allowed, the Contractor shall file certified delivery tickets for all aggregates actually used. Delivery tickets shall show the date, truck number, the gross weight, the tare weight, and the net weight of the crushed aggregate.

6. MEASUREMENT: The quantity of crushed aggregate base course, iron ore topsoil or crushed aggregate for trenches, completed and accepted will be measured by cubic yardage (CY), as specified in appropriate line item on unit price schedule. The quantity of crushed aggregate base course or iron ore topsoil, completed in place and accepted will be determined by the average job thickness obtained in accordance with paragraph THICKNESS CONTROL and the dimensions indicated. Deductions will be made for any material wasted, unused, rejected, or used for the convenience of the Contractor, and for water exceeding the specified amount at time of weighing.

The quantity of crushed aggregate for trenches, completed in place and accepted will be determined by the average trench depth multiplied by the trench area.

7. PAYMENT: Quantity of crushed aggregate or iron ore topsoil, as specified above will be paid for at the contract unit price, which will constitute full compensation for the construction and completion of the base course, including compaction, water, equipment and all other necessary labor and incidentals.

PART 2 - PRODUCTS

8. AGGREGATES: Aggregates shall consist of clean, sound, durable particles of crushed stone, crushed slag, crushed gravel, or crushed concrete and screenings. The Contractor shall obtain materials that meet the specification and can be used to meet the grade and smoothness requirements specified herein, after all compaction operations have been completed. Slag shall be an air-cooled, blast-furnace product having a dry weight of not less than 65 pcf as determined by ASTM C 29. The aggregates shall be free of silt and clay, vegetable matter, and other objectionable materials or coatings. The portion retained on the No. 4 sieve shall be known as coarse aggregate; that portion passing the No. 4 sieve shall be known as fine aggregate.

8.1 Coarse Aggregates: Coarse aggregates shall be angular particles of uniform density. The coarse aggregate shall have a loss not greater than 14 percent weighted averaged at five cycles when tested for soundness in magnesium sulfate in accordance with ASTM C 88. The coarse aggregate shall have a percentage of wear not to exceed 40 for A and B grades or 50 for C and D grades after 500 revolutions as determined by ASTM C 131. The percentage of flat and/or elongated particles shall not exceed 20 in the fraction retained on the 1/2-inch sieve. A flat particle is one having a ratio of width to thickness greater than 3; an elongated particle is one having a ratio of length to width greater than 3. When the coarse aggregate is supplied from more than one source, aggregate from each source shall meet the requirements set forth herein. Crushed gravel shall be manufactured from gravel particles 90 percent of which by weight are retained on the maximum-size sieve listed in Table I. In the portion retained on each sieve specified, the crushed gravel shall contain at least 90 percent by weight of crushed pieces having two or more freshly fractured faces with the area of each face being at least equal to 75 percent of the smallest mid-sectional area of the piece. When two fractures are contiguous, the angle between planes of the fractures must be at least 30 degrees in order to count as two fractured faces.

8.2 Binder Material: Binder material shall consist of screenings, angular sand, or particles produced by crushing stone, slag, concrete, or gravel that meets the requirements for wear and soundness specified for coarse aggregate.

8.3 Gradation Requirements: Gradation requirements specified herein shall apply to the completed base course. The aggregates shall conform to one of the gradations shown below for 2004 TxDOT Item

32 11 20 -4

247, Type A, Grade 2 or AHTD, Section 306, Class SB-2, as modified below. Sieves shall conform to ASTM E 11.

TABLE I. GRADATION OF AGGREGATES

Percentage by Weight Passing Square-Mesh Sieve (a) (b) Sieve AHTD Section 306 TxDOT Item 247 Designation Class SB-2, modified Type A Grade 2 1-3/4 inch --- 90-100 1-1/2 inch 100 --- 3/4 inch 50-80 --- No. 4 25-45 25-55 No. 40 10-25 15-40 No. 200 1-10 --- NOTE a: Particles having diameters less than 0.02 mm shall not be in excess of three percent (3%) by weight of the total sample tested.

NOTE b: The values are based on aggregates of uniform specific gravity, and the percentages passing the various sieves may require appropriate correction by the Contracting Officer when aggregates of varying specific gravities are used.

8.4 Triaxial Requirements: The Triaxial requirements for the TxDOT - 2004 Standard Specifications, Item 247, Type A, Grade 2 shall apply to material furnished to that gradation. No triaxial requirements apply to the AHTD, Section 306, Class SB-2, as modified above.

8.5 Wet Ball Mill Requirements: The Wet Ball Mill requirements for the TxDOT - 2004 Standard Specifications, Item 247, Type A, Grade 2 maximum increase passing No. 40 Sieve shall be 20%.

8.6 Liquid Limit and Plasticity Index: Liquid limit and plasticity index requirements stated herein shall apply to any aggregate component that is blended to meet the required gradation and also to the aggregate in the completed base course. The portion of the SB-2 and Type A aggregate passing the No. 40 sieve shall be either nonplastic or have a liquid limit not greater than 25 and a plasticity index not greater than 6.

PART 3 - EXECUTION

9. PREPARATION OF UNDERLYING COURSE: Prior to constructing the crushed aggregate base course, the underlying course shall be cleaned of all foreign substances. At the time of construction of the base course, the underlying course shall contain no frozen material. Ruts or soft, yielding spots in the underlying courses, areas having inadequate compaction, and deviations of the surface from the requirements set forth herein shall be corrected by loosening and removing soft or unsatisfactory material and by adding approved material, reshaping to line and grade, and recompacting to specified density requirements. The finished underlying course shall be maintained by the Contractor in a satisfactory condition until the base course is placed.

10. GRADE CONTROL: During construction, the lines and grades including crown and cross slope indicated for the base course shall be maintained by means of line and grade stakes placed by the Contractor in accordance with the SPECIAL CONDITIONS.

11. MIXING OF MATERIALS: The coarse and binder materials shall be mixed in a stationary plant, or in a traveling plant or bucket loader. The Contractor shall make such adjustments in mixing procedures or in equipment as may be directed to obtain true grades, to minimize segregation or degradation, to obtain the required water content, and to insure a satisfactory base course meeting all requirements of this specification.

32 11 20 -5

12. PLACING: The mixed material shall be placed on the prepared subgrade or subbase in layers of uniform thickness with an approved spreader. When a compacted layer 7 inches or less in thickness is required, the material shall be placed in a single layer. When a compacted layer in excess of 7 inches is required, the material shall be placed in layers of equal thickness. No layer shall exceed 7 inches or be less than 3 inches when compacted. The layers shall be so placed that when compacted they will be true to the grades or levels required with the least possible surface disturbance. Where the base course is placed in more than one layer, the previously constructed layers shall be cleaned of loose and foreign matter by sweeping with power sweepers, power brooms, or hand brooms, as directed. Such adjustments in placing procedures or equipment shall be made as may be directed to obtain true grades, to minimize segregation and degradation, to adjust the water content, and to insure an acceptable base course.

13. COMPACTION:

13.1 Requirements: Each layer of base course shall be compacted as specified to produce an average field-measured density, through the full depth, of at least 95 percent of CE 55 maximum density obtained in the laboratory. In all places not accessible to the rollers, the base course material shall be compacted with mechanical tampers.

13.2 Finishing: The surface of top layer of base course shall be finished after final compaction, and proof rolled, where required, by cutting any overbuild to grade and rolling with a steel-wheeled roller.

In no case will thin layers of material be added to the top layer of base course to meet grade. If the elevation of top layer of base course is 1/2 inch or more below the grade, the top layer of base shall be scarified to a depth of at least 3 inches, new material shall be added, and the layer shall be blended and recompacted to bring to grade. Adjustments in rolling and finishing procedures shall be made as may be directed to obtain grades, to minimize segregation and degradation of base course material, to adjust the water content, and to insure an acceptable base course. Material found unacceptable shall be removed and replaced, as directed, with acceptable material.

14. SMOOTHNESS TEST: The surface of the top layer shall not deviate more than 3/8 inch when tested with a 10-foot straightedge applied parallel with and at right angles to the centerline of the area to be paved. Deviations exceeding 3/8 inch shall be corrected as directed.

15. THICKNESS CONTROL: The completed thickness of the base course shall be within 1/2 inch of the thickness indicated. The thickness of the base course shall be measured at intervals providing at least one measurement for at least each 500 square yards of base course. The depth measurement shall be made by test holes at least 3 inches in diameter. Where the measured thickness of the base course is more than 1/2 inch deficient, such areas shall be corrected by excavating to the required depth and replacing with new material. Where the measured thickness of the base course is 1/2 inch more than indicated, it will be considered as conforming with the requirements plus 1/2 inch, provided the surface of the base course is within 1/2 inch of established grade. The average job thickness shall be the average of the job measurements as specified above but within 1/4 inch of the thickness indicated. In lieu of weighing, the following formula will be used to determine the tonnage.

W = (T/12) x A x %FD/100 x D x 0.0005, where:

W = number of 2,000 pound tons, T = average thickness in inches, A = completed and accepted base course area in square feet, %FD = average density in percent, D = maximum laboratory density in pounds per cubic foot.

16. MAINTENANCE: The base course shall be maintained in a condition that will meet all specification requirements until accepted.

--End of Section--

RRAD, IDIQ, Paving & Utilities W9126G-09-R-0066

32 11 24-1

SECTION 32 11 24

TXDOT TYPE C IRON ORE BASE COURSE (AM #2)

CRUSHED AGGREGATE BASE COURSE

PART 1 - GENERAL

1. APPLICABLE PUBLICATIONS: The publications listed below form a part of this specification to the extent referenced. The publications are referred to in the text by basic designation only.

Texas Department of Transportation (TXDOT)

Standard Specifications for Construction and Maintenance of Highways, Streets, and Bridges (2004)

2. GENERAL: The work specified herein consists of the construction of an aggregate base course.

The work shall conform to the lines, grades, notes and typical sections provided in the plans and shall be performed in accordance with TXDOT Item 247, except the following:

• measurement and payment sections shall not apply;

• change the word “Engineer” to “Contracting Officer”;

• Iron Ore Topsoil: Type C material shall consist of iron ore topsoil. Wet Ball Mill requirements for the Type C Iron Ore Topsoil, maximum increase passing No. 40 Sieve shall be 20%. Said material shall be crushed to meet the gradation below;

Percentage by Weight Passing Square-Mesh Sieve

Sieve TXDOT Item 247 Designation Type C Grade 4 1-3/4 inch 100 No. 4 25-40 No. 40 15-50

• Sampling and testing shall conform to the requirements of TXDOT, Item 247, except as noted in paragraph 7 below, and;

• Field Quality Control shall conform to the requirements of TXDOT Item 247 and as presented in paragraph 9 below..

3. MEASUREMENT: The quantity of crushed aggregate base course, iron ore topsoil or crushed aggregate for trenches, completed and accepted will be measured by cubic yardage (CY), as specified in appropriate line item on unit price schedule. The quantity of crushed aggregate base course or iron ore topsoil, completed in place and accepted will be determined by the average job thickness obtained in accordance with paragraph 9.4 THICKNESS CONTROL and the dimensions indicated. Deductions will be made for any material wasted, unused, rejected, or used for the convenience of the Contractor, and for water exceeding the specified amount at time of weighing.

The quantity of crushed aggregate for trenches, completed in place and accepted will be determined by the average trench depth multiplied by the trench area.

RRAD, IDIQ, Paving & Utilities W9126G-09-R-0066

32 11 24-2

4. PAYMENT: Quantity of crushed aggregate or iron ore topsoil, as specified above will be paid for at the contract unit price, which will constitute full compensation for the construction and completion of base course, including compaction, water, equipment and all other necessary labor and incidentals.

5. WAYBILLS AND DELIVERY TICKETS: Copies of delivery tickets shall be submitted during the progress of the work. Before the final statement is allowed, the Contractor shall file certified delivery tickets for all aggregates actually used. Delivery tickets shall show the date, truck number, the gross weight, the tare weight, and the net weight of the crushed aggregate.

6 SUBMITTALS: The following shall be submitted to the Contracting Officer prior to commencement of work::

6.1 SD-70, Test Reports: Calibration curves and related test results shall be submitted prior to using the device or equipment being calibrated.

6.2 SD-76, Certificates of Compliance: Certified copies of the manufacturer's test reports indicating compliance with applicable specified requirements shall be submitted to the Contracting Officer for approval not less than 14 days before the material is required in the work.

6.3 SD-91, Records: Sources from which aggregate materials are to be obtained shall be selected and notification thereof furnished the Contracting Officer within 30 days prior to the time the material will be required in the work.

7. SAMPLING AND TESTING:

7.1 Source Sampling and Testing: Sampling and testing at the source shall be the responsibility of the Contractor. Sampling and testing shall be performed by an approved commercial testing laboratory, except for dry sieve analysis samples, which may be taken by the Contractor from the conveyor belt discharge. Copies of test results shall be furnished to the Contracting Officer.

7.2 Job Site Sampling and Testing: All sampling and testing at the job site shall be the responsibility of the Contractor and shall be performed at no cost to the Government. Testing shall be performed by an approved commercial testing laboratory. When test results indicate that compaction is not as specified, the material shall be removed, replaced and re-compacted to meet specification requirements, at no additional cost to the Government. Tests on re-compacted areas shall be performed as directed by the Government at the Contractor's expense.

7.3 Minimum Number of Tests at The Source: During production the Contractor shall ensure that the minimum amount of testing specified below is performed initially and at testing intervals shown. Any material which is placed and accepted without the required testing at the source will be paid for at 90% of the contract unit price. Minimum testing requirements at the source are:

Required Test Testing Interval Sieve Analysis - dry 500 CY Sieve Analysis - washed 4000 CY Liquid Limit and Plasticity Index 4000 CY Wear Test 2000 CY

7.4 Approval of Material: The source of the material to be used for producing aggregates shall be selected 30 days prior to the time the material will be required in the work. Tentative approval of material will be based on tests of samples for the specific job. Final approval of both the source and the material will be based on tests for gradation, liquid limit, and plasticity index performed on samples taken from the completed and compacted subbase course.

8. WEATHER LIMITATION: Base courses shall be placed when the atmospheric temperature is above 35 degrees F. Areas of completed base course that are damaged by freezing, rainfall, or other weather conditions shall be corrected to meet specified requirement.

RRAD, IDIQ, Paving & Utilities W9126G-09-R-0066

32 11 24-3

9. FIELD QUALITY CONTROL:

9.1 Compaction: Each layer of base course shall be compacted as specified to produce an average field-measured density, through the full depth, of at least 95 percent of the maximum density obtained in the laboratory. In all places not accessible to the rollers, the base course material shall be compacted with mechanical tampers.

9.2 Finishing: In no case will thin layers of material be added to the top layer of base course to meet grade. If the elevation of top layer of base course is 1/2 inch or more below the grade, the top layer of base shall be scarified to a depth of at least 3 inches, new material shall be added, and the layer shall be blended and recompacted to bring to grade. Material found unacceptable shall be removed and replaced, as directed, with acceptable material.

9.3 Smoothness: The surface of the top layer shall not deviate more than 3/8 inch when tested with a 10-foot straightedge applied parallel with and at right angles to the centerline of the area to be paved.

Deviations exceeding 3/8 inch shall be corrected as directed.

9.4 Thickness Control: The completed thickness of the base course shall be within 1/2 inch of the thickness indicated. The thickness of the base course shall be measured at intervals providing at least one measurement for at least each 500 square yards of base course. The depth measurement shall be made by test holes at least 3 inches in diameter. Where the measured thickness of the base course is more than 1/2 inch deficient, such areas shall be corrected by excavating to the required depth and replacing with new material. Where the measured thickness of the base course is 1/2 inch more than indicated, it will be considered as conforming with the requirements plus 1/2 inch, provided the surface of the base course is within 1/2 inch of established grade. The average job thickness shall be the average of the job measurements as specified above but within 1/4 inch of the thickness indicated. In lieu of weighing, the following formula will be used to determine the tonnage:

W = (T/12) x A x %FD/100 x D x 0.0005, where:

W = number of 2,000 pound tons, T = average thickness in inches, A = completed and accepted base course area in square feet, %FD = average density in percent, D = maximum laboratory density in pounds per cubic foot.

10. MAINTENANCE: The base course shall be maintained in a condition that will meet all specification requirements until accepted.

PART 2 - NOT APPLICABLE

PART 3 - NOT APPLICABLE

End of Section