B08_Attachment_1_Statement_of_Work.docx

Scope of Work

USGS/Albuquerque Seismological Laboratory Target Rd 10002 Isleta SE Kirtland AFB, NM 87117

ASL Operations Background:

The USGS, at the Albuquerque Seismological Laboratory (ASL), operates and maintains the Global Seismograph Network (GSN). The ASL does both research and operations in earthquake monitoring, this includes receiving data 24/7 from stations around the world. Data analyzed by scientists at ASL are used to help mitigate loss of life and property. The ASL facilities are in the foothills of the Isleta Pueblo approximately 14 miles from the Truman gate of Kirtland Air Force Base.

Overall project scope:

The USGS/ASL requires maintenance construction for restoration and preservation of the asphalt entrance to the Albuquerque Seismological Laboratory. The entrance way is located on KAFB. The asphalt is failing on the edges due to wear, weather and type of material used previously. The following Statement of Work (SOW) lists requirements to facilitate construction of the work for this requirement.

1. Work Statement:

1.1 Contractor shall provide all labor, materials, equipment, transportation, and professional guidance required to perform the work explained in this work statement. All work explained in this SOW will be performed in accordance with NM DOT Standard Specifications for Highway and Bridge Construction, 2019 Edition.

2. Asphalt Milling: NM DOT Standard Specifications for Highway and Bridge Construction, 2019 Edition. (Reference Sections 414,303, 902).

2.1 The contractor shall mill asphalt for approximately 374 linear feet and the 24-foot width of existing asphalt. Estimated existing asphalt depth ranges from ¾ inches to 3 inches. (Reference Section 414.) [footnoteRef:1] [1: 414.3.1 & 414.3.2, Materials milled will stay in road prism and mixed into base course. ]

2.2 The contractor will mill existing asphalt in place. Milled asphalt will remain on the existing road prism to be mixed and used in the base course at a depth of 6 inches. (Reference Section, 303.)[footnoteRef:2] [2: 303.2.1 #5]

2.3 For compaction requirements refer to #4 base course and #10 testing and measurement of this work statement. (Reference Sections 303, 902).

3. Sub-grade/Dig out: NM DOT Standard Specifications for Highway and Bridge Construction, 2019 Edition. (Reference Sections 203-A, 207).

3.1 The contractor shall excavate and repair a section of subgrade that has failed. This section measures 25 feet long, 14 feet wide at a depth of 2 feet (Reference Section 203-A.)

3.2 The contractor will excavate the unstable subgrade area, marked by the Technical Representative, at 2 feet deep or until failure is identified, whichever comes first. (Reference Section 203-A.1.)[footnoteRef:3] [3: Two feet shall be the maximum excavation depth required.]

3.3 The contractor shall remove materials from the excavation debris that have been deemed unsuitable by the PM. (Reference Section 203.2.1.5). Authorizations will be obtained by the PM for base landfill use. Base landfill is approximately 20 miles round trip.

3.4 The contractor shall backfill excavated area with suitable material, authorized by the PM, from an approved source. (Reference section 203-A.3, #1,3&6. 207)

3.5 Sub-grade will be compacted with a vibratory roller compactor to ensure compaction meets or exceeds 96% Modified Proctor. (Reference section 207.3, 303, subsection 303.3.2) [footnoteRef:4] [4: Reference Section 902 for density test specifications.]

4. Base course: NM DOT Standard Specifications for Highway and Bridge Construction, 2019 Edition. (Reference Sections 209, 302, 303).

4.1 Base course, for the purposes of this contract, will be the mixture of existing base course and milled asphalt, no less than 6 inches in depth from top of existing asphalt measured before milling. (Reference Section 302, 303.2.1 # 5).

4.2 The contractor shall scarify and mix milled asphalt with existing base course evenly to present a uniform mix and appearance (Reference Section 302, 303.1.2). [footnoteRef:5] [5: Table 303.2.2:1]

4.3 The contractor will process, layout and compact base course layer to 26 feet. 13 feet on either side of existing centerline. (Reference section 209.)

4.4 The contractor shall smooth and compact base course with the proper moisture content to meet or exceed 96% Modified Proctor, as stated in. (Reference Section 303.3.2).

5. General Excavation/ Ditch Excavation for utilities: NM DOT Standard Specifications for Highway and Bridge Construction, 2019 Edition. (Reference Sections 660, 663).

5.1 Contractor shall excavate a utility ditch approximately 32 LF at a 90-degree angle to the existing road centerline.

5.2 Depth of the utility trenches will be no less than 24 inches deep and 18 inches wide.

5.3 A 4-inch Schedule 80 grey electric PVC pipe approximately 30 LF long will be placed across the road located by the Contracting Officer Representative (COR) or technical representative and have a 90-degree sweep into utility boxes at each end. (Reference Sections 663).[footnoteRef:6] [6: Section 663.3.2]

5.4 The contractor will supply, and place two traffic rated Quazite Mod# PG1324Z80317 underground utility boxes, or approved equivalent, at Technical Representatives determined locations.

5.5 Utility boxes will be located no closer than 3 feet from the finished asphalt shoulder edge

5.6 All utility trenches will be backfilled using best practices and compacted to 95% of maximum dry density as determined by AASHTO T 180 (Modified Proctor). (Reference Section 660.3.3, 660.3.3.1, 660.3.3.2).

6. Erosion control/Rip Rap: NM DOT Standard Specifications for Highway and Bridge Construction, 2019 Edition. (Reference Sections 602).

6.1 Drainage ditches will be reestablished and excavated to insure proper drainage.

6.2 The contractor shall do all ditch excavations and ditch cleaning to match the shoulder rock width of 28 feet wide and be accepted by the PM before base course processing may begin.[footnoteRef:7] [7: To ensure a clean base course work environment it is suggested the ditch and drainage work be done prior to milling.]

6.3 The contractor shall construct and place 6 rip rap wire basket gabions at the down stream side of concrete road dip. (Reference Sections 602.2).[footnoteRef:8] [8: Table 602.2.1:1]

6.4 The contractor will excavate approximately 90 cubic yards of native material from the adjacent and downstream end of the road dip to accommodate erosion control structures. (Reference # 6.5 of this SOW.)

6.5 The contractor shall install erosion control structures in accordance with the plan drawing, CC-101. The structure will be designed to pass the low flow storm event, but be substantial enough to resist washing out during a 10 year storm or less likely storm event. Flow calculations are not required for this SOW because the design is to only pass the low flow amounts at the road crossing without the use of culvert pipes (Reference Sections 602).

6.6 The contractor shall temporarily store excavated materials on sight for possible project use. All remaining excavated materials will be hauled to the base landfill by the contractor.

7. Concrete: NM DOT Standard Specifications for Highway and Bridge Construction, 2019 Edition. (Reference Sections 207, 303, 509, 540, 902).

7.1 The contractor shall submit a concrete mix design two weeks prior to scheduled concrete pours to the PM and Technical Representative for review and acceptance.

A. For structural concrete walls: Reference Section 509.2.7.1, class AA B. For concrete pavements: Reference Section 509.2.7.1, class P.

7.2 The location of the rolling dip and arroyo header and rip rap cage skirt will be confirmed with the PM and Technical Representative prior to excavation.

7.3 The contractor shall construct a rolling dip with a base course of 6 inches of NM DOT approved 6-inch base course crushed aggregate compacted, with 6 inches of concrete paving. (Reference Section 303.3.2)[footnoteRef:9] [9: Table 303.2.2:1]

7.4 Contractor shall place a concrete header/retaining wall on the up-stream side of the arroyo. The concrete header shall be 24 feet long, 4’-6” feet tall, at its shortest point, (See attached plan view) and be 6 inches thick with a continuous 12-inch by 3’-6” footer.

7.5 The contractor will provide reinforcing steel and/or wire mesh for this project and provide proof of compliance with Reference Section 540 (Steel Reinforcement) to the PM and Technical Representative at each shipment.

7.6 The contractor will construct reinforcing steel using #4 rebar [footnoteRef:10]at the spacing(s) called out in the details, throughout the footings and walls, at minimum, on the vertical & horizontal planes. [10: Table 540.2.1:1]

7.7 The contractor shall coordinate concrete testing with a 3rd party accredited and licensed laboratory. (Reference Section 902).[footnoteRef:11] [11: 902.2.1.2]

7.8 The contractor shall backfill concrete header after appropriate crush tests have been performed and proof of compliance to 4000psi at 28 days cure ratio has been obtained for class AA.[footnoteRef:12] (Reference Section 509). [12: 509.2.7.1]

7.9 The contractor will backfill the header in compliance with (Reference section 207.3, 303, subsection 303.3.2) and bring up the flow line grade to match the edge of the concrete water crossing.

8. Asphalt: NM DOT Standard Specifications for Highway and Bridge Construction, 2019 Edition. (Sections 303, 423).

8.1 The contractor shall supply the PM and Technical Representative with an asphalt mix design two weeks prior to planned asphalt placement. Mix designs and testing must conform to (Reference Section 423.2.8). [footnoteRef:13] [13: Table 423.2.8.1]

8.2 All finished asphalt road width will be 24 feet wide.

8.3 The contractor shall Place 1.5 inches of SP3 Surface Course asphalt over 2 inches of SP4 Intermediate Course asphalt for a final compacted thickness of 3.5 inches.

8.4 The contractor shall test asphalt density in 3 locations designated by the PM. Density testing shall conform to (Reference Section 423.3.6.1.2).

8.5 Asphalt shall have a crown with a minimum 2% outward slope for site drainage. Flatten crown to match concrete swale at the water crossing.

9. Shoulder rock: NM DOT Standard Specifications for Highway and Bridge Construction, 2019 Edition. (Sections 303).

9.1 Contractor shall place a 24 inches wide crushed rock shoulder to match new asphalt grade and maintain 2% out slope. (Reference Section 303.2.2).

9.2 The contractor shall place shoulder rock on both sides of the newly placed asphalt, the full length of 374 LF each side.

9.3 The contractor will compact shoulder rock 96% of maximum density, in compliance with (Reference Section 303.3.2).[footnoteRef:14] [14: AASHTO T 180 (Modified Proctor), method D.]

10. Testing and Measurements: NM DOT Standard Specifications for Highway and Bridge Construction, 2019 Edition. (Sections 303, 902).

10.1 The contractor will provide a Quality Control plan that contains all testing required by this work statement two weeks prior to the start of work to the Technical Representative and PM for review and approval. (Reference Section 902).

10.2 The contractor shall hire a 3rd party testing company to test all testing requirements stated in this work statement in accordance with specifications explained in NM DOT Standard Specifications for Highway and Bridge Construction, 2019 Edition. (Reference Section 902.3)

10.3 The contractor will schedule testing in a timely manner to ensure schedules and timelines are met.

10.4 The contractor shall deliver test results within one working day of receipt to the PM and Technical Representative for review and acceptance.

11. General requirements:

11.1 The contractor will use the attached specifications and NM DOT Standard Specifications for Highway and Bridge Construction, 2019 Edition and all sections therein that relate directly to the work stated in this SOW.

11.2 The contractor shall practice strict compliance with all state, local and federal safety laws and codes while executing work in this contract.

11.3 All excess excavated material will be hauled to the base solid waste landfill at contractors’ expense. The PM will provide permissions through the base landfill for dumping. (Approximately 20 miles round trip).

11.4 The contactor is responsible for site cleanup prior to final inspection.

12. Quality Assurance

1. The contractor is responsible for working in accordance with all KAFB regulations while working under this contract. Contractor will work safely around government structures, utilities and vegetation. The contractor is responsible for any damage to trees, scrubs, utilities, concrete, asphalt or structures, and will repair or replace damaged items at contractors’ expense.

2. Contractor will coordinate all road or parking lot closures with the POC 24 hours in advance.

3. The contractor shall keep one lane of traffic open Monday through Friday 6:00AM to 6:00PM.

4. All compaction necessary for this stated work will be subject to a warranty from the contractor. Warranties for all compaction will hold the contractor responsible for subgrade and ditch settling of - 0.5 inches or greater from finish grade. If settling of subgrade or ditches exceeds .5 inches the contractor will return and fix the settling within one year. Settling will be measured with a straight edge of proper length to prove previously determined finish grade.

5. If the contractor has a discrepancy with specifications, the matter will be immediately submitted to the CO in writing. Any suggestions or changes to the scope of work or this contract must be submitted in writing and approved by the CO. All materials and workmanship will be inspected by the COR or Technical representative assigned by the COR. Any work deemed unsatisfactory by the COR or representative will be promptly corrected.