HomeMy WebLinkAbout26-182 - Contract - KBA, Inc. - Construction Management: Interurban Ave Overlay Project26-182
Council Approval 5/4/26
Cost
Cost
Project Cost Estimate HWA Ref: 2026-066
Inspection & Testing Date: 7-May-26
Tukwila Interurban Ave S Overlay
Tukwila, WA Prepared By: LM/BKH
Prepared For: Cameron Bloomer P.E.
PROPOSED WORK SCOPE:
1. Sampling and acceptance/Proctor testing of CSTC for use in utility trench backfill, and roadway/sidewalk construction.
2. Inspection and testing of compacted aggregates for utility trenches, roadway/sidewalk subgrade, and ADA ramp construction.
3. Sampling of concrete aggregate for acceptance testing.
4. Concrete sampling for pole foundations and driveways.
5. Sampling of HMA aggregate for acceptance and oil at the plant for ignition oven correction factor.
6. Sampling and testing HMA during paving for Rice density, extraction and gradation (minimum: one test sample per 800 tons).
7. Inspection and testing of HMA placement and compaction (minimum: one test per 80 tons).
8. Written field reports will be prepared for all inspections and reviewed for QC.
Material Testing - ESTIMATED HWA LABOR:
GeoEng VIII GeoEng II Geol VII Geol II Contracts TOTAL TOTAL
$110.00 $50.00 $78.00 $42.00 $60.00 HOURS AMOUNT
8 8 $336
12 12 $504
12 12 $504
32 32 $1,344
80 80 $3,360
4 4 $168
39 39 $1,638
4 4 $168
18 18 $756
12 12 $504
16 16 $800
4 12 4 20 $1,616
4 16 12 221 4 257 $11,698
Geotechnical Observation/Project Management
Pavement/Subgrade Evaluations (2 visits)
QA Review, PM, Reporting, Submittal Reviews, and Report Distribution
Concrete Inspection and Testing, including:
Sampling of concrete aggregates at WSDOT intervals
Driveways (2 visits, plus pickups)
Inspection and Testing during HMA Roadway/Overlay (10 visits)
This cost estimate is based on plans and specifications provided by Client.
Scope of Services
2026 PERSONNEL & BILLING RATES
Aggregate Inspection and Testing, including:
Sampling of CSTC at WSDOT intervals (assume 2 sources)
Inspection and Testing of full-depth repair areas (2 visits)
Inspection and Testing of compacted aggregates for roadway/sidewalk construction (2 visits)
Asphalt Inspection and Testing, including:
Inspection and Testing during HMA permanent trench patching (4 visits)
HMA Oven Ignition Correction Sampling of Aggregate and Oil (2 mixes x 1 source)
PPB Foundations (3 visits, plus pickups)
HMA Sampling at Batch Plant (13 trips)
DIRECT SALARY COST
Est. No.Unit Total
Tests Cost Cost
2 $395 $790
4 $205 $820
2 $330 $660
20 $55 $1,100
7 $355 $2,485
2 $625 $1,250
17 $800 $13,600
$20,705
$1,260
$859
$1,290
$3,409
$11,698
$20,972
$3,430
$36,101
$20,705
$3,409
ESTIMATED TASK TOTAL:$60,215
Assumptions:
1. These estimates may require adjustment due to the Contractor's rate of construction, weather delays, source changes and/or other factors beyond our control.
2. The HWA PM reserves the right to shift hours between the various subtasks as required.
3. The HWA work scope does not include safety assessment nor work pertaining to any environmental issues.
4. This cost estimate was prepared with the understanding that the Client will schedule inspection as needed.
5.
6. All weekend work is charged at an 4 hour minimum segment. Weekend work cancelled within 12 hrs of scheduled time will be charged 4 hrs.
7. 3000 psi, Commercial, and concrete for sidewalks and thrust blocks will not be tested.
8. No density testing will be needed for water service connections outside of the roadway prism.
9.
10.This cost estimate does not include Special Inspections (reinforcing steel, welding, structural anchors, etc). HWA is not WABO certified.
11.Client submitted requests should be sent to Dispatch@hwageo.com
12.Requests are encouraged to be submitted at least 48 hours (72 hours for night work) before the requested work.
13.Requests submitted within 24 hours (48 hours for night work) of work will be covered based on availablility of staff.
All night work is charged at an 8 hour minimum segment. Night work cancelled within 12 hrs of scheduled time will be charged 4 hrs.
Direct Expenses
OH @ 1.7928 * DSC
FF @ 10.5% * (DSC+OH)
ESTIMATED DIRECT EXPENSES:
Mileage to Job Site IRS Rate 0.725/mile, assume 26 trips
Mileage for Sampling Aggregates and HMA at Sources
Nuclear Gauge Rental (Soil @ $60; Thin Lift @ $75): 18 days
TOTAL DIRECT EXPENSES:
ESTIMATED PROJECT TOTALS AND SUMMARY:
Total Labor Cost
Laboratory Testing
Direct Salary Cost (DSC)
Proctor Tests on all Materials to be Compacted
Concrete Compressive Strength Cylinders (assume 5 sets x 4 cylinders each set)
HMA Aggregate Testing (FF, SE, Unc. Voids) (at WSDOT sampling intervals)
HMA: Rice Density, Extraction/Gradation
TOTAL LABORATORY TESTING:
HMA Oven Correction Factor (2 mixes x 1 source; 3 burns per OCF)
LABORATORY TESTING SUMMARY:
Acceptance Testing Concrete Aggregates (GS) - 2 mixes x 1 source x 2 aggregates
HWA's laboratory is not equipped to test HMA binder or tackifier. This testing is performed by WSDOT's Bituminous Materials Lab. WSDOT will only allow invoicing to a contract with the Owner
(they cannot invoice HWA for this work). This estimate does not contain time for sampling/driving samples to the Tumwater lab.
Acceptance Testing for CSTC (GS, SE, Fracture) - assume 2 sources