QA Aggregate stone (002)

1. SOW Section 2.1 and Section L refer to FA-3 Fill Sand, while SOW Section 3.3 reproduces an FA-1 curve with general FA-3 tolerances. Please clarify the controlling sieve limits for CLIN 0005, including the higher No. 100 and No. 200 sieve tolerances.
ANS: SOW Section 3.3 is amended to remove the FA-1 baseline curve. CLIN 0005 shall conform strictly to Standard FA-3 Fill Sand gradation (3/8 in.: 100%, No. 4: 97±3%, No. 8: 80±15%, No. 16: 50±20%, No. 50: 25±15%, and minus No. 200 not to exceed 5.0% on a washed basis).
2. The SOW lacks complete gradation requirements for SS-5 (beyond "100% passing No. 4 sieve"). Please provide the complete sieve requirements (percent passing, including No. 200 limits) and confirm whether SS-5 must be natural sand or can be crushed limestone screenings.
Sieve
Size

Target Percent
Passing (%)

Engineering Function & Compliance Notes

No. 4
(4.75
mm)

Establishes the absolute maximum nominal particle
size .

No. 8
(2.36
mm)

90 – 100

Ensures a uniform transition into the sand-sized
range.

No. 16
(1.18
mm)

60 – 90

Distributes intermediate particles for optimal
interlocking.

No. 30
(600 µm)

40 – 75

Controls bulk density and water-holding/drainage
capacity.

No. 50
(300 µm)

15 – 45

Crucial for preventing void spaces and settlement.

No. 100
(150 µm)

2 – 20

Restricts over-fining on fine sand fractions.

No. 200
(75 µm)

0 – 10.0

Strict cap on dust and clay. Material must be tested
via AASHTO T 11 / ASTM C 117 (washed) to prevent
structural failures

ANS: SS-5 Material and Gradation Clarification:
Fine Aggregate SS-5 shall conform to the complete gradation envelope specified in the table above. SS-5 may consist of clean, washed natural sand, or manufactured sand produced from crushed limestone screenings. If crushed limestone screenings are utilized, the contractor must provide certified laboratory test results demonstrating a washed No. 200 sieve pass of ≤ 5.0% and a minimum Sand Equivalent (SE) value of 45.

3. Please provide the specific gradation parameters or the KDOT (Kansas Department of Transportation) standard reference section that applies to SA-1. ANS: SA-1 Aggregate Compliance: All material supplied under CLIN 0003 (SA-1) must consist of 100% crushed stone or crushed gravel conforming to the physical quality requirements of KDOT Division 1100, Section 1104 / Section 1111 The contractor shall submit washed sieve analysis reports (AASHTO T 27/T 11) and Plasticity Index (PI) certifications verifying a PI strictly between 4 and 12 from an