Rock Chalk Park-Pavement Corings Lawrence, Kansas

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1 850 E. 13th Street Ste. B (785) Office cfse.com Other Offices: Topeka, Kansas Kansas City, Kansas Wichita, Kansas Kansas City, Missouri Branson, Missouri Springfield, Missouri August 29, 2014 City of Lawrence East 6 th Street P.O. Box 708 Attn: Dave Cronin Re: Rock Chalk Park-Pavement Corings Lawrence, Kansas Dave: CFS Engineers performed twenty (20), four (4) inch diameter concrete corings on August 22, 2014 as requested per the City of Lawrence. Cores were taken at locations marked by the City of Lawrence. The concrete, AB-3 subbase and fly ash treated subgrade thicknesses were determined. The subbase and subgrade thicknesses were measured in the field and the concrete cores were brought back to the office for measurement. The concrete cores (except for coring #14) will be stored at our Lawrence office for a period of sixty (60) days in the case the City of Lawrence has any questions on the findings of this investigation. The fly ash treated subgrade measurements only indicate the presence of fly ash in the material, not the quality of the subgrade or the fly ash content. After the coring was performed, a hand auger was used to extract the disturbed soil at the desired depth. The bottom of the hand auger was checked to determine if fly ash was present in the soil. Please let us know if you have any questions. The opportunity to provide this service to the City of Lawrence is appreciated. Kenneth M. Blair, P.E. Chairman Robert S. Chambers, P.E. President-Treasurer Sabin A. Yañez, P.E. Senior -Secretary Kevin K. Holland, P.E. Daniel W. Holloway, P.E. Respectfully, Cook, Flatt & Strobel Engineers, P.A. Jared B. Mohrman Jared B. Mohrman, E.I.T. cc: Attachment Charles C. LePage, P.E. Lance W. Scott, P.E.

2 850 E. 13th Street Ste. B (785) Office cfse.com Other Offices: Topeka, Kansas Kansas City, Kansas Wichita, Kansas Kansas City, Missouri Branson, Missouri Springfield, Missouri September 16, 2014 City of Lawrence East 6 th Street P.O. Box 708 Attn: Dave Cronin Re: Rock Chalk Park-Pavement Additional Corings George Williams Way Lawrence, Kansas Dave: CFS Engineers performed three (3) additional four (4) inch diameter concrete corings on September 11, 2014 as requested per the City of Lawrence. The scope included concrete coring and examining the soil in locations determined and marked by the City of Lawrence. The corings are labeled as 5a, 6a and 7a. The concrete cores and soil samples will be stored at our office for a period of sixty (60) days in the case the City of Lawrence has any questions on the findings of this investigation. The fly ash treated subgrade measurements in the attached summary only indicate the presence of fly ash in the material, not the quality of the subgrade or the fly ash content. After the concrete coring was performed, a hand auger was used to extract the top six(6) inches of soils beneath the concrete for corings 5a, 6a and 7a. The soil samples were taken back to our laboratory to determine the presence of fly ash in the soil samples. There was no indication of the presence of fly ash in the soil samples for the three corings performed on September 11, Kenneth M. Blair, P.E. Chairman Robert S. Chambers, P.E. President-Treasurer Sabin A. Yañez, P.E. Senior -Secretary Kevin K. Holland, P.E. Daniel W. Holloway, P.E. Charles C. LePage, P.E. Please let us know if you have any questions. The opportunity to provide this service to the City of Lawrence is appreciated. Respectfully, Cook, Flatt & Strobel Engineers, P.A. Jared B. Mohrman Jared B. Mohrman, E.I.T. cc: Attachment Lance W. Scott, P.E.

3 Coring Concrete Thickness (inch) Planned Concrete Planned subbase Thickness Minimum Fly Ash Treated Planned Fly Ash Treated AB-3 Subbase Thick. (inch) Thickness (inch) (inch) Subgrade Thickness (inch) Subgrade Thickness (inch) / / / a No indication of fly ash / No indication of fly ash 9 6a 9 1/ No indication of fly ash / No indication of fly ash 9 7a 9 3/ No indication of fly ash / No indication of fly ash / / / / / / / / * / / No indication of fly ash / / / * Coring stopped at 23", the full thickness of fly ash was not determined

4 Rock Chalk Park Concrete Pavement Core Sample Locations for the City Of Lawrence, Kansas Twenty core samples will be taken at strategic locations throughout the site on public roads, private roads, access roads, and parking lots. The descriptions of the locations match the numbers on the map. All samples shall be taken at least 3 feet from the nearest joint. The term central location refers to the perceived middle of the described area, in the middle of a panel. Rock Chalk Drive 1. West end west bound lane right wheel path 2. Intersection with Private Drive west bound lane left wheel path 3. Intersection with Rock Chalk Lane east bound lane right wheel path 4. Intersection with George Williams Way (just past return) east bound lane left wheel path George Williams Way 5. Intersection with Rock Chalk Drive north bound lane right wheel path 6. Southern half north bound lane left wheel path 7. South Lot entry south bound lane left wheel path 8. Northern half south bound lane right wheel path Rock Chalk Parkway 9. South Lot (East) entry east bound lane left wheel path 10. North Lot entry west bound lane left wheel path Rock Chalk Lane 11. Intersection with Rock Chalk Lane south bound lane left wheel path 12. Northwest Lot (East) entry north bound lane left wheel path West Lot 13. South half driving lane central location Bus Lane in Northwest Lot 14. West bound lane right wheel path Fire/Access Lanes 15. East/west access (behind Rec) driving lane central location 16. Northeast/southwest access (south of Rec) driving lane central location Northwest Lot 17. Southern driving lane central location

5 North Lot 18. Northern half of the western side driving lane central location South Lot 19. Western third southern driving lane central location 20. Northeastern corner driving lane central location

6 10" Concrete - George WIlliams Way and Rock Chalk Drive 7" 5" 7"

7 Massachussetts St. Lawrence, KS p: f: A A 6 5A 4 5