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Home My WebLink AboutSUB201600033 Study 2022-08-15ECS MID -ATLANTIC LLC 'Setting the Standard for Service' Geotechnical • Construction Materials • Environmental • Facilities November 20, 2019 Mr. Dan Tucker S.J. Collins Enterprises 5 SW Broad Street, Suite B Fairburn, GA 30213 ECS Proposal No. 28:1989 Reference: Addendum to Plan of Action - Pavement Investigation and Repair 51h Street Station Parkway Charlottesville, Virginia Dear Mr. Tucker: The following is an Addendum to the ECS "Plan of Action" (PDA) report dated October 10, 2019. The detail below shows the approximate limits of the cracks which have developed in the existing pavement along 5" Street Station Parkway, generally situated between Wegmans Way and Merchant Walk Avenue. ant s Way tya. t Sto WALL A GENERAL AREA OF PAVEMENT DISTRESS. NOTE: Repair crack in pavement for north travel lane and beginning of turn -lane. Estimate 130If. NORTH For crack repair, as discussed in the ECS "Plan of Action" report dated October 10, 2019, ECS recommends milling 2-inches of the existing pavement surface for the north travel lane and portion of the left turn -lane, in the general area shown in the sketch. It is estimated that the length of pavement repair is 130 lineal feet, however, the repair limits shall be field verified, and shall extend a minimum of 10 feet in each north -south direction. Milling shall be performed approximately 5-inches from the centerline pavement striping/marking (west side of repair), and shall extend to the edge of the gutter pan (east side of repair). The existing pavement crack shall be cut out full depth, so as to expose the underlying stone subbase. It is recommended that saw cutting be performed for the full depth of asphalt, and shall extend a minimum of 12" on each side of the crack(s). 4004 Hunterstand Court, Suite 102, Charlottesville, VA 22911 • T: 434.973.3232 F: 434.973.3238 • ecslimited.com ECS Capitol Services, PLLC • ECS Florida, LLC • ECS Mid -Atlantic, LLC • ECS Midwest, LLC • ECS Southeast, LLP • ECS Southwest, LLP 5th Street Station Parkway— Pavement Investigation and Repair (Addendum) November20, 2019 ECS Proposal No. 28:1989 Page 2 Pavement restoration shall consist of Base Mix Asphalt (BM-25) placed up to the milled surface, and the surface restored full width using Surface Mix Asphalt (SM-9.5, or as specified by VDOT). Prior to placement of base asphalt within the crack repair area, compaction testing shall be performed on the exposed Stone Subbase (assumed to be VDOT 21A/B Type Stone) using a Nuclear Gauge to determine the in -place density of the stone. This testing shall be performed at approximate 25-foot intervals, or about 6 test locations. Following the Nuclear Gauge testing, a hand auger boring shall be performed through the stone subbase to determine the subbase thickness. Dynamic Cone Penetrometer (DCP) and/or Static Cone Penetrometer (SCP) testing shall be performed at subgrade elevation, and at one -foot intervals up to a depth of 3 feet below subgrade elevation. A hand auger boring shall be used to help advance the DCP and SCP test probes. The DCP and SCP probe testing is intended to provide an indication of subgrade compaction and soil strength properties. The subgrade material removed by the hand auger boring shall be visually classified during augering, and representative samples of soil subgrade materials shall be collected for laboratory testing, to include in - situ moisture content and classification type testing (gradation analysis and Atterberg Limits). In two of the test locations (approximately 50 feet apart), the hand auger boring shall be extended to a depth of 5 feet below top of pavement, and the soil material removed shall be visually classified. NOTES: 1). All hand auger probe holes shall be backfill with tamped VDOT #10 Stone Screenings, or similar material. 2). Proofrolling of the stone subbase, as discussed in the October 10, 2019 POA Report, is not considered practical, and therefore, not recommended herein. As discussed in the October 10, 2019 POA Report, ECS proposes to perform the below outlined observation and testing services in conjunction with the repair operation performed by others. Our planned scope of services will include: - Documentation of the existing asphalt pavement thickness. - Documentation and evaluation of subbase stone thickness checks, density testing using a Nuclear Gauge and a typical Standard Proctor value for VDOT 21A/B Size Stone, and preefrelling using a fully leaded tandern axle duFnp tru4*-. - Documentation and evaluation of subgrade soil materials through pree€relling, hand auger probes, and Dynamic Cone Penetrometer (DCP) and Static Cone Penetrometer (SCP) testing. - Collect representative samples of soil subgrade materials for laboratory testing, to include in -situ moisture content and classification type testing (gradation analysis and Atterberg Limits). - Provide field developed repair options in the event that subbase or subgrade issues are encountered or observed. - Documentation and Testing of prepared subgrades, newly placed or reworked subbase stone, and newly placed asphalt, as per the original project plans. Daily reports of our field activities will be submitted documenting our findings in the field. A separate memorandum letter will be submitted after field investigations and repairs have completed. Field investigations and documentation will be performed by an ECS staff engineer or geologist, or designated staff technician. EE 5`n Street Station Parkway— Pavement Investigation and Repair (Addendum) ECS Proposal No. 28.1989 Closing November20, 2019 Page 3 We appreciate this opportunity to be of service to you. If there are any questions regarding the planned exploration and recommendations presented herein, please do not hesitate to contact us. Respectfully, ECS MID -ATLANTIC, LLC - AN �, ThomasJ. DeGoetano, P.E. Senior Project Engineer TDeGoetano @ecslimited. com ATTACHMENTS: • ECS Site Photographs (7/19/19) David E. Stinnette, P.E. 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