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HomeMy WebLinkAboutSUB200400125 Correspondence 2006-10-18ql LL 0 0'�Ii .W 0 a z a W z z W E"1 z 0 U W b4 z 0 U z W A z 0 F rA 41 wzzw �wz- wz�- 3 O Owl zw�- U U > O d w O 6 w a z � x O F �a L �a H Z 8 1 , A Ni LL 0 Ni i 3 1 o� V w AT w r z 96 w ti U r A a d e xx � a w a �o F w Wis, Ca O Q h 0 w d < a. d d z d ccca J d w F o z a a a z O w d w —I r+l foil Q 4 a u e C tn 10/18/2006 08:00 4349793759 VDOT PAGE 02/02 VIRG.INIA, DEPARTMENT OF TRANSPORTATION .INTRA-DEPARTMENTAL MEMORANDUM September 28, 2006 MEMORANDUM TO: Mr. C_ T. Baber FROM: Roger C. Diner SUBJECT' CBR Tests & Pavernent Design Castlevicw Way Stilihouse Ridge Subdivision Albemarle County rn Oct l/A lrr response to your memorandum dated 9.22.06, I have reviewed the five (5) C13R tests submitted for the above roadway, My review indicates that the tests appear to have been performed in a satisfactory ma�aner. However, the test for the sample at station 15+50 contains a computatiotT crcar i`or the CBR value and the stress - strain curve correction for the test on the material front station 25+50 is questionable. Correcting these two itms CBR values of 16.2 and 5.2. On the basis of the test results and an anticipated traffic of 90 VPD, a pavement design analysis confirms the adequacy of the Plan pavement design, In fact, the base corarse can be redueod to six (6) inches of Aggregate Base Material, lope I, 517e ZI/4 and still achieve the required structural capacity. It is noted that the plot labeled as "TESTED" on the design nomograph submitted with the tests is incorrect in that the Average CER value was plotted on the SSV scale vorsus The design CDR (which is 213 of the average), Please advise if"er dismission is required. $.�/ Roger C. )?liter Assistant District Materials Engineer COUNTY OF ALBEMARLE Department of Community Development 401 McIntire Road, Room 227 Charlottesville, Virginia 22902-4596 (434)296-5832 Fax (434) 972-4126 TRANSMITTAL TO: Charles Baber DATE: September 14, 2006 Virginia Department of Transportation SUBJECT: CBR Stillhouse Ridge The following items are being sent ® Attached ❑ Via Fax ❑ Copy of Letter ❑ Specifications ❑ Shop Drawings ❑ Plans ❑ Contract ® Other ❑ Plat ❑ Change Order COPIES DESCRIPTION 1 CBR tests for Stillhouse Ridge(Sta. 10+50, 15+50, 20+50, 25+50, and 28+50), Location Map, and Pavement Design Worksheet. ❑ For Approval ❑ Approved as Submitted ❑ Resubmit Copies for Approval ® For Your Use ❑ Approved as Noted ❑ Submit Copies for Distribution ® As Requested ❑ Returned for Corrections ❑ Return Corrected Prints ❑ For Review and Comment ❑ For Bids Due ❑ Prints Returned after Loan to Us ❑ Remarks: Copy: Signed: If enclosures are not as noted; kindly notify us at once. Virginia Department of Transportation — Pavement Design Guide © 1996 (rev2000) Appendix II Nomograph for Determining Required Pavement Thickness Index DR (Note: An enlarged version of this nomograph is provided on the last page of this reference.) Final pavement design must be based on the results of appropriate soil tests. Preliminary designs may be based on values established in Appendix I. Example DR = 10.7 (interpolated) for design parameters SSV = I I and Design ADT = 480 L30 or more (interpolated) 13 12 11 .. 10 ........... 7 .................... 6 (TESTED , 200 DESIGN 100 .SSV 50 Scale Design ADT Scale 25.0 24.0 30,000 23.0 20,000 10.000 20.0 1910 6,000 18.0 4,OOD 17.0 3,000 16.0 2, 000 15.0 1,000 14.0 B00 19.0 000 12.0 40Q.................... 11.0 iO 10.0 9.0 6.0 7.0 - - 6.4 Minimum 6,0 PR Thickness Index Scale To determine DR, project a line from the value for SSV through the value for the Design ADT. The nomograph depicted correlates the soil support value of the subgrade (SSV = Design CBR x RF), the traffic volume (Design ADT), and the minimum required pavement design thickness index (DR) for subdivision streets and secondary road pavement, based on AASHO design equations. This nomograph assumes the following: 1. Use of Design ADT for two way traffic, equally distributed, thereby deriving the thickness index (DR) required for any portion of the pavement to support one-half of the design ADT. 2. For DR greater than 20, staged construction providing an initial stage DR value of 20 may be permitted. 3. The District Materials Engineer may consider reducing the minimum DR value of 6.4 for secondary system facilities having a Design ADT <50. 26 Page 1 of 3 Greg Cooley From: Rob Cummings [rob@khals.net] Sent: Thursday, August 31, 2006 4:43 PM To: Clay Greene; Greg Cooley Cc: kirk@khals.net Subject: Fw: Re: FW: Stillhouse Ridge Attachments: Pavement Design Appendix Il.pdf Clay, It appears that based upon the GBR tests conducted by Gooch Engineering that the typical cross section for Stillhouse Ridge is adequately designed according to the Virginia Department of Transportation Pavement Design Guide. Please find the attached Nomograph for additional information. If you have any questions please call me at your earliest convenience. Thanks, Rob Cummings Project Manager Kirk Hughes & Associates Land Surveyors & Planners 220 East High Street Charlottesville, VA 22902 (434) 296-6942 (434) 295-7540 Fax rob(&-khals.net This e-mail and any attachments may be confidential or legally privileged. If you received this message in error or are not the intended recipient, you should destroy the e-mail message and any attachments or copies, and you are prohibited from retaining, distributing, disclosing or using any information contained herein. Please inform us of the erroneous delivery by return e-mail. Thank you for your cooperation. -------Original Message ------- From: Clay Greene Date: 08/30/06 16:26: 01 To: 'Rob Cummings'; 'Greg Cooley' Subject: FW: Stillhouse Ridge Rob, Please find attached a copy of the CBR reports from Gooch Engineering for Stillhouse Ridge. i need a letter (or something) from you to give to the County that confirms, based on these reports, that the original pavement design for Stillhouse Ridge is adequate (or propose an alternative design). 9/14/2006 Page 2 of 3 Greg, Please find a copy of the same CBR reports I dropped off for you all last week. I am getting the location map from Gooch and will drop it off as soon as I have it. Thanks, e&w ,fn 100 10th Street NE Suite 103 Charlottesville, VA 22902 Office: 434-975-0085 ext. 110 or 865-975-0085 Fax: 434-973-7960 From: Greg Cooley [mailto:gcooley@albemarle.org] Sent: Thursday, August 24, 2006 12:25 PM To: Clay Greene Cc: Warner Wilkerson Subject: Stillhouse Ridge Clay Thank you for the CBR tests for Stilhouse Ridge. In addition to what was submitted, we need two copies of the CBR Tests, a location map showing where the tests were done, and a pavement design worksheet showing that the original design is adequate or proposing an alternative design. Let us know if you have any questions. 9/14/2006 Page 3 of 3 Sincerely, Gregory J. Cooley Jr., P.E. Road Engineer Community Development Department Albemarle County, VA 9/14/2O06 John Y. Gooch, P.E. J-L Steve Gooch, CP.G✓A.O.S.E. znee�-ing Phone (434) 293-7449 �i�e.S`Z"LIZg� rP74C7_ Fax (434) 293-5137 1821 Broadway Street Charlottesville, Virginia 22902 www.gooch-eng.com August 15, 2006 Mr. Jamie Spence Church Hill Development LLC 100 10t'. Street NE, Suite 103 Charlottesville, Virginia 22902 Re: CBR Tests Stillhouse Ridge JOB CODE: 2436 Dear Jamie Enclosed are the results of five (5) tests we ran on soil samples from the referenced site. We have enclosed the moisture -density (compaction) curves, the sieve analysis results and the stress -strain curves. Our personnel performed sampling in the field. We hope this is the information you need. If you have any questions, please let us know. Sincerely, Gooch Engineering and Testing, Inc. Steve Gooch Encl. O O C h 1821 Broadway Street n g i n e e r i n g Charlottesville, VA 22902 o Phone 434-293-7449 AL e s t t n g, In c. FAX 434-293-5137 CBR TEST REPORT Date: 5/26106 By; HPP Project: Stiilhouse Ridge Job No.: 2436 Sample: Locat.: Castleview Way Sta 10+50 Description: Red brown clayey silt AASHO T-99 X Max. Dry Dens. 101.5 pcf., Opt. Moisture 22.8 % AASHO T-180 Cylinder No. 8 Cylinder Ht. 4.584 in. Cylinder Vol. 0.0744 cu.ft. Cylinder Wt. 9.04 Hammer Wt. 5.5 lb No. Lifts 3 Blows/lift 50 Surcharge Wt. 10 lb. DENSITY AND MOISTURE DATA As Compacted After Soaking Can No. A7 A8 A7 q8 Wt. wet sample + can, gm. 68.51 68.48 68.63 68.49 Wt. dry sample + can, gm. 60.06 59.79 59.49 59.25 Wt. water, gm. 8.45 8.69 9.14 9.24 Wt. can, gm. 21.55 20.98 21.55 20.98 Wt. dry soil, gm. 38.51 38.81 37.94 38,27 Percent moisture 21.94 22.2 22.39 24.09 24.1 24.14 Wt. mold + wet soil, lb. 18.17 18.34 Wt. wet soil, lb. 9.13 9.30 Wet density of soil, pcf. 122.72 124.24 Dry density of soil, pcf. 100.45 100.10 Percent max. lab density 99.0 98.6 PENETRATION DATA Penetration in. Load lb. 0.000 0 0.025 130 0.050 235 0.075 330 0.100 410 0.150 550 0.200 665 0.300 860 0.400 1035 0.500 1200 SWELL DATA Dial reading before soaking Dial reading after soaking Swell Percent Swell Volume after soaking CBR = 100(410/3000) = 13.7 0.029 in 0.057 in 0.028 in 0.61 % 0.0749 cu. ft. 0 a v- r o a a o 0 0 N O 00 CD "Rt N Y r pEO-1 5 u7 0 v 0 N 0 0 SIEVE ANALYSIS REPORT Stillhouse Ridge Castleview Way Sta 10+50 Sieve Cumulative % Passing % 100 4 100 10 98.5 40 85.5 200 65.2 AT"'ERBERG LIMITS Liquid Limit 33.3 Plastic Limit 30.0 Plasticity Index 3.3 O 0 C h 1821 Broadway Street n g i n e e r i n g Charlottesville, VA 22902 Phone 434-293-7449 es tin g , In C . FAX 434-293-5137 CBR TEST REPORT Date: 7/13/06 By: HPP Project: Westhall III Job No.: 2436 Sample: Locat.: Castleview Way Sta 15+50 Description: Brown sandy silt AASHO T-99 X Max. Dry Dens. 106.8 pcf., Opt. Moisture 18.6 % AASHO T-180 Cylinder No. 7 Cylinder Ht. 4.584 in. Cylinder Vol. 0.0744 cu.ft. Cylinder Wt. 9.02 Hammer Wt. 5.5 lb No. Lifts 3 Blowsllift 50 Surcharge Wt. 10 lb. DENSITY AND MOISTURE DATA As Compacted After Soaking Can No. A29 A30 A29 A30 Wt. wet sample + can, gm. 68.61 68.43 68.54 68.61 Wt. dry sample + can, -gm. 61.35 60.86 61.03 61.26 Wt. water, gm. 7.26 7.57 7.51 7.35 Wt. can, gm. 21.42 21.74 21.42 21.74 Wt. dry soil, gm. 39.93 39.12 39.61 39.52 Percent moisture 18.18 18.8 19.35 18.96 18.8 18.60 Wt. mold + wet soil, lb. 18.53 18.60 Wt. wet soil, lb. 9.51 9.58 Wet density of soil, pcf. 127.82 128.54 Dry density of soil, cf. 107.63 108.22 Percent max. lab density 100.8 101.3 PENETRATION DATA Penetration in. Load lb. 0.000 0 0.025 115 0.050 230 0.075 350 0.100 485 0.150 730 0.200 965 0.300 1375 0.400 1740 0.500 2065 SWELL DATA Dial reading before soaking Dial reading after soaking Swell Percent Swell Volume after soaking CBR = 100((730-230)I3000) = 16.7 0.011 in 0.019 in 0.008 in 0.17 % 0.0745 cu. ft. 0 LO LO T- m .a N 3 m V d a t co OO O QO O O O LO O LO Q 0 N N r r peo'1 m a N O N Cq tn ID 00 W) C� Eld/sEl'i luisim2icl ANCI SIEVE ANALYSIS REPORT Stillhouse Ridge Castleview Way Sta 15+50 Sieve Cumulative % Passing 3/ 100 4 100 10 98.5 40 75.5 200 51.2 ATTERBERG LIMITS Liquid Limit 26.4 PIastic Limit 24.1 Plasticity Index 2.3 o o c h ngineering c�Z esting,inc. 1821 Broadway Street Charlottesville, VA 22902 Phone 434-293-7449 FAX 434-293-5137 CBR TEST REPORT Date: 8/10/06 By: HPP Project: Stillhouse Ridge Job No.: 2436 Sample: Locat.: Castleview Way Sta 20+50 Description: Red brown sandy silt AASHO T-99 X Max. Dry Dens. 107.7 pcf., Opt. Moisture 17.1 % AASHO T-180 Cylinder No. 1 Cylinder Ht. 4.584 in. Cylinder Vol. 0.0744 cu.ft. Cylinder Wt. 9.31 Hammer Wt. 5.5 lb No. Lifts 3 Blows/lift 50 Surcharge Wt. 10 lb. DENSITY AND MOISTURE DATA As Compacted After Soaking Can No. Al A2 Al A2 Wt. wet sample + can, gm. 68.60 68.56 68.61 68.57 Wt. da sample + can, gm. 61.95 61.84 60.45 60.49 Wt. water, gm. 6.65 6,72 8.16 8.08 Wt. can, gm. 21.25 21.02 21.25 21.02 Wt. dry soil, gm. 40.70 40.82 39.20 39.47 Percent moisture 16.34 16.4 16.46 20.82 20.6 20.47 Wt. mold + wet soil, Ib. 18.48 18.90 Wt. wet soil, lb. 9.17 9.59 Wet density of soil, pcf. 123.25 128.12 Dry density of soil, pcf. 105.89 106.19 Percent max. lab dens4 98.3 98.6 PENETRATION DATA Penetration in. Load lb. 0.000 0 0.025 190 0.050 400 ' 0.075 555 0.100 700 0,150 880 0.200 965 0.300 1175 0.400 1365 0.500 1540 SWELL DATA Dial reading before soaking Dial reading after soaking Swell Percent Swell Volume after soaking CBR = 100(700/3000) = 23.3 0.033 in 0.061 in 0.028 in 0.61 % 0.0749 cu. ft. c a d IN T 0 may► p O O C 3 C7 O Ca O 0 0 O co co N O co co qq N T T T T T peo-1 0 N O O N O O� 0 o CR o 0 0 0 0 O P O O 6 O O O E,LJ/Sff'I AUSNEIQ AXG SIEVE ANALYSIS REPORT Stillhouse Ridge Castle -view Way Sta 20+50 Sieve Cumulative % Passing % 100 4 98.7 10 97.9 40 92.5 200 52.1 ATTERBERG LIMITS Liquid Limit 27.4 Plastic Limit 24.9 PIasticity Index 2.5 ooch ngin eening c�z estingjnc. CBR TEST REPORT 1821 Broadway Street Charlottcsville, VA 22902 Phone 434-293-7449 FAX 434-293 ;5137 Date: 8/10106 By: HPP Project: Stillhouse Ridge Job No.: 2436 Sample: Locat.: Castleview Way Sta 25+50 Description: Brown sandy silt AASHO T-99 X Max. Dry Dens. 105.7 pcf., Opt. Moisture 15.2 % AASHO T-180 Cylinder No. 2 Cylinder Ht. 4.584 in. Cylinder Vol. 0.0744 cu.ft. Cylinder Wt. 9.31 Hammer Wt. 5.5 lb No. Lifts 3 Blows/lift 50 Surcharge Wt. 10 lb. DENSITY AND MOISTURE DATA As Compacted After Soaking Can No. A3 A4 A3 A4 Wt. wet sam le + can, gm. 68.60 68.62 68.50 68.49 Wt. dry sample + can, gm. 61.95 62.55 60.51 61.62 Wt. water, gm. 6.65 6.07 7.99 6.87 Wt. can, gm. 20.97 20.81 20.97 20,81 Wt. dry soil, gm. 40.98 41.74 39.54 40.81 Percent moisture 16.23 15A 14.54 20.21 18.5 16.83 Wt. mold + wet soil, lb. 18.38 18.91 Wt. wet soil, lb. 9.07 9.60 Wet density of soil, pcf. 121.91 126.12 Dry density of soil, pcf. 105.65 106.41 Percent max. lab density. 100.0 100.7 PENETRATION DATA Penetration in. Load lb. 0.000 0 0.025 45 0.050 70 0.075 110 0.100 155 0.150 255 0.200 340 0.300 465 0.400 565 0.500 665 SWELL DATA Dial reading before soaking Dial reading after soaking Swell Percent Swell Volume after soaking CBR = 100(20013000) = 6.7 0.042 in 0.148 in 0.106 in 2.31 % 0.0761 cu. ft. 0 en N w V3 a 3 d d w UN ca CJ 4) 0) N 0 y+ cn peo7 9 0 v 0 a 0 cq CO o ..' m c m b I 0 ow 0 r- c F- Un O 0 0 wi O O O O O L O O O SIEVE ANALYSIS REPORT Stillhouse Ridge Castleview Way Sta 25+50 Sieve Cumulative % Passing % 100 4 100 10 98.4 40 88.1 200 54.8 ATTERBERG LEWTS Liquid Limit 32.2 Plastic Limit 30.0 Plasticity Index 2.2 O O C h 1821 Broadway Street n g i n e e r i n g Charlottesville, VA 22902 O Phone 434-293-7449 QL e S tin g , in C . FAX 434-293-5137 CBR TEST REPORT Date: 8/10/06 By: HPP Project: Stillhouse Ride Job No.: 2436 Sample: Locat.: Castleview Way Sta 28+50 Cul-de-sac Description: Brown sandy silt ' AASHO T-99 X Max. Dry Dens. 109.0 pcf., Opt. Moisture 13.5 % AASHO T-180 Cylinder No. 3 Cylinder Ht. 4.584 in. Cylinder Vol. 0.0744 cu.ft. Cylinder Wt. 9.31 Hammer Wt. 5.5 lb No. Lifts 3 Blows/lift 50 Surcharge Wt. 10 lb. DENSITY AND MOISTURE DATA PENETRATION DATA Penetration in. Load lb. 0.000 0 0.025 60 0.050 105 0.075 150 0.100 200 0.150 290 0.200 355 0.300 460 0.400 560 0.500 660 SWELL DATA Dial reading before soaking Dial reading after soaking Swell Percent Swell Volume after soaking CBR = 100(20013000) = 6.7 0.046 in 0.143 in 0.097 in 2.12 % 0.0760 cu. ft. v O T V 0 co N R A to 3 d m H O f.� Gf d N O t CO CD LO m N PRO-1 9 0 0 c O _ M ` O CD a . N O r 0 n T Csa/sgz A.LISNEIa AWI SIEVE ANALYSIS REPORT StiMouse Ridge Castleview Way Sta 28+50 (Cul-de-sac) Sieve Cumulative % Passing 3/4 100 4 100 10 99.1 40 86.4 200 53.6 ATTERBERG LIMITS Liquid Limit 29.8 Plastic Limit 27.5 Plasticity Index 2.3 Page 1 of Greg Cooley From: Greg Cooley Sent: Thursday, August 24, 2006 12:25 PM To: 'Clay Greene' Cc: Warner Wilkerson Subject: Stillhouse Ridge ,'lay -hank you for the CBR tests for Stilhouse Ridge. n addition to what was submitted, we need two copies of the CBR Tests, a location map showing where the tests were done, and a iavement design worksheet showing that the original design is adequate or proposing an alternative design. _et us know if you have any questions. Nricerely, .7regory J. Cooley Jr., P.E. Zoad Engineer .ommunity Development Department k1bemarle County, VA icooley@albemarle.org 434)296-5832 ext. 3336 3/24/2006 F�1(hyrch Rill flomei Integrity, Quality, Teamwork 1.00 10th Strut NE Suite 103 Charlottesville, VA 22902 Office: 434-975-0085 x 1 10 Fax: 434-973-7960 We are sending you: As Requested X Attached Under Separate Cover For our: Records X Use and information Approval Review and comment Use and Distribution Estimate of cost Via: Overnight mail Mail X Hand delivered Fax: Number of pages: cb4 Clay Greene Development -Manager Clay.g@churchhilldev.com Date: August 21, 2006 Company: Albemarle County Attn: Warner Wilkerson From: Clay Greene Project Name: Stillhouse Ridge Copies Date 1 8/15/06 Description CBR report Memo: Please give me a call if you need anything else. Remarks: Chyr(h Hill flome5 Ynie,�riiy, Quality, Teamwork 1.00 1Oth Street NE Suite 103 Charlottesville, VA 22902 Office: 434-975-0085 x 110 Fax: 434-973-7960 We are sending you: As Requested X Attached Under Separate Cover For our: Records X Use and information Approval Review and comment Use and Distribution Estimate of cost Via: Ovemight mail Mail X Hand delivered Fax: Number of pages: Clay Gr e. DevelorWent Manager Clay.a@churchhilidev.com Copies Date: September 5, 2006 Company: Albemarle County Attn: Greg Cooley From: Clay Greene Project Name: Stillhouse Ridge Date Description 8/15/06 CBR re ort aki—Ai plan indicating CBR locations Memo: Please give me a call if you need anything else. Remarks: RE-CWVSD Sip 05 2006 COMMUWrYORVELOPEOT