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Home My WebLink AboutWPO201100088 Certified Engineer's Report 2018-12-06f&p Field Observation Form Report Date: 10/31/2017 I� Various Crozet Office 6181 Rockfish Gap Turnpike Crozet, VA 22932 Phone: 434-823-5154 Fax: 434-823-4764 Client: Contour Construction 1713-2B Allied St. Charlottesville, VA 22903 Project: 71P0094 Stonewater-Contour Rio Road next to Treesdale Charlottesville, VA Date: 10/24/2017 Location: Storm Water Pond Category: General Location Details: Coverage: Site Observation Type: Observation Frequency: Periodic Weather: cloudy and cool Air Temp. (deg. F): 72 F&R Personnel: Butler, Shane , Technician Description of Work Completed Work Completed: fill to raise pond berm Observations: testing cancelled due to last night rain Determination: As Specified Page 1 of 1 Field Observation Form Report Date: 10/31/2017 Various Crozet Office 6181 Rockfish Gap Turnpike Crozet, VA 22932 Phone:434-823-5154 Fax: 434-823-4764 Client: Contour Construction 1713-2B Allied St. Charlottesville, VA 22903 Project: 71P0094 Stonewater-Contour Rio Road next to Treesdale Charlottesville, VA Date: 10/23/2017 Location: Storm Water Pond Category: General Location Details: Coverage: Site Observation Type: Observation Frequency: Periodic Weather: cool Air Temp. (deg. F): 68 F&R Personnel: Butler. Jason . Technician Description of Work Completed Work Completed: fill to raise pond berm Observations: F&R technician observed Contour construction had removed asphalt walking path from berm and vegetation from berm and back toe of slope down to stable material in preparation of approximately 4 feet of fill placement. This is a rough area, Contour began to use two loaded tandem axle trucks to bring a silty SAND (SM) material with gravels from borrow (Whittington Place), end dump material, have a loader take it on downstream slope, with dozer to spread and track it in, followed by multiple passes of a vibratory sheepsfoot loader. Determination: As Specified Page 1 of 1 f&D Field Observation Form Report Date: 10/31/2017 h Various Crozet Office 6181 Rockfish Gap Turnpike Crozet, VA 22932 Phone: 434-823-5154 Fax: 434-823-4764 Date: 10/25/2017 Category: General Coverage: Site Observation Client: Project: Contour Construction 71 P0094 1713-213 Allied St. Stonewater-Contour Charlottesville, VA 22903 Rio Road next to Treesdale Charlottesville. VA Location: Storm Water Pond Location Details: Type: Observation Frequency: Periodic Weather: cool Air Temp. (deg. F): 68 F&R Personnel: Butler, Jason , Technician Description of Work Completed Work Completed: fill to raise storm pond berm Observations: Contour placed one 8 inch lift across entire pond today. They used two tandem axle trucks to bring a sandy SILT (ML) material with gravels from borrow (Whittington Place), end dump material, have a loader take it on downstream slope, with dozer to spread and track it in, followed by multiple passes of a vibratory sheepsfoot loader. F&R onsite, had dozer scrape a spot flat and used nuclear density gauge to test material and found it to be above 95% compaction and within 3 % of optimum moisture. F&R also observed sheepsfoot roller walk out of the material. Determination: As Specified Page 1 of 1 f&D Field Observation Form Report Date: 10/31/2017 I� Various Crozet Office 6181 Rockfish Gap Turnpike Crozet, VA 22932 Phone: 434-823-5154 Fax: 434-823-4764 Client: Contour Construction 1713-26 Allied St. Charlottesville, VA 22903 Project 71P0094 Stonewater-Contour Rio Road next to Treesdale Charlottesville, VA Date: 10/27/2017 Location: Storm Water Pond Category: General Location Details: Coverage: Site Observation Type: Observation Frequency: Periodic Weather: cool Air Temp. (deg. F): 68 F&R Personnel: Butler, Jason . Technician Description of Work Completed Work Completed: fill to raise storm pond berm Observations: Contour now at 1.5 feet, and placing an 8 inch loose lift across entire berm and slope of pond today. Two tandem axle trucks hauled borrow consisting of a sandy SILT (ML) material with gravels from borrow (Whittington Place), and end dump material on the berm. Then a loader placed it on the downstream slope, and a dozer spread and track material in. Multiple passes of a vibratory sheeps foot roller compacted the lift until the machine walked out of the material. F&R technician observed little to no movement (pumping) indicating material was stable and prepared for next lift. Gauge was used to spot check material and found to be at or more than 95% compaction. Determination: As Specified Page 1 of 1 FROEHLING & ROBERTSON, INC. Engineering Stability Since 1881 6185 Rockfish Gap Turnpike Crozet, Virginia 22932-3330 T 434.823.5154 1 F 434.823.4764 F&R Record Number 71VO184 Contour Construction 1713-213 Allied Street Charlottesville, VA 22903 Attention: Ms. Sheila Scott Subject: Stonewater Berm Raise Albemarle County, Virginia Dear Ms. Collins: December 6, 2018 F&R has been requested to evaluate the below grade soils for the Stonewater Berm in addition to the testing previously performed from 10-23-17 to 11-03-17 previously submitted indicating the spot check density tests done met 95% of the maximum density. F&R performed two soil borings outside the asphalt path with DCP soundings to depths of 3 feet on the raised berm using a hand auger, designated Al and A2, which were performed at the approximate locations indicated on the attached Dynamic Cone Penetration Sheet. At each location, soil samples were collected and were visually classified in the laboratory by a geotechnical engineer. Dynamic Cone Penetrometer (DCP) testing was also performed on the soils within the hand auger borings. The DCP is a device utilizing a 15 pound steel weight failing 20 inches to drive a cone with a diameter of 1.5 inches and height of 1.66 inches a distance of 1.75 inches into the ground. The number of hammer blows required to drive the cone three successive 1.75 inch increments is recorded, and these blow counts provide a general indication of in -situ soil conditions and has been correlated with certain engineering properties of soils. The raised portion of the berm soils were found to consist of medium -stiff to stiff fill materials which visually classified as a moist orange sandy SILT (ML) and correlated with a bearing of 2000 psf. If you have any further questions concerning the information contained in this letter, or if we can be of further assistance to you, please contact us. P,LTi Respectfully yours, FROEHLING & ROBERTSON, INC. John L. Pappas, P.E. Senior Geotechnical Engineer ell 0 -No o JQ - N L. PAPPAS 01 "231 art { ��' � C'� • �� Corporate HQ: 3015 Dumbarton Road Richmond, Virginia 23228 T 804.264.2701 F 804.264.1202 www.fandr.com VIRGINIA • NORTH CAROLINA ,* SOUTH CAROLINA • MARYLAND * DISTRICT OF COLUMBIA A Minority -Owned Business r,1 m.r FAR i eei DYNAMIC CONE PENETRATION DATA SHEET Project: _SWA1& #47'&k Client: 110AI' Uk F&R Rep: 5't/,gNE BU'TL tE�R DYNAMIC CONE PENETRATION Test Test Location No. /Y 65ND FO/Nl) A l SO -1 po om e SJz- 3 /N L.19AXPFT ,ov )_=A/A AZ, Zs FQ o� r✓ Test i Depth' 0 Location: 0915E0 66R41 Date (on -site): // - /6 - /8 Project No.: 71 y01goe (7/P0407) TESTS {ASTMSpecial Technical Publication No. 399) Sample Blowsz Visual Classification of Subsurface Conditions 3 3 3 3 Z 4 S 4fT Z Z 3 XOwCovMS Z o �3�g�RINGr S 6 S S 3 D ��E SAIVB V 5_XX_ to9 �3 B�owCovN Zmo��s �,4R/AlAy n....u, o.. i...., c....�..�tea Gni mflafinn Cnhnrarla fr 0 r-T FT u%.r L.ocauun 0nva.11 7FS 7-OrP AILL PLfi`I�Eb �i��✓<o vsc.y ��o� AP�Roxr �i qr��-y �3y Ca�v7Dv� 7V 4 406 sogm pow BEktn. Form No. 512 (rev 4/1107) Blows Per 1.75-inch Increment Following Initial Seating The soil descriptions and classifications indicated above are based on visual observation and should be considered approximate. Subsurface conditions in unexplored locations may vary from those encountered and noted above. 07Fe AW 70 4,0 V—r,5 7- Bob W?rS 70 /%1/SS j j-SP�fi9GT Gtl� L iCtiliG'1 f �!� AV 7VP 01-'